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  • General Chemistry  (2,207)
  • 42.75
  • Aircraft Propulsion and Power
  • Seismology
  • 2015-2019  (924)
  • 1950-1954  (2,294)
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  • 1
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    Unknown
    The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen (2019)
    Details
    Publication Date: 2019-12-05
    Description: The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps–Apennines–Carpathians–Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.
    Description: Published
    Description: 1009–1033
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Seismology ; Alps ; Seismic network ; Geodynamics ; Seismic imaging ; Mountain building
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 2
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 60 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:60
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 26 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1986.
    Description: Inhaltsverzeichnis: Journal of Geophysics 60 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0011.pdf"〉Investigation of the velocity- and Q-structure of the lowermost mantle using 〈i〉PcP〈/i〉/〈i〉P〈/i〉 amplitude ratios from arrays at distances of 70°–84°〈/a〉〈br〉 (Schlittenhardt, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0014.pdf"〉Fast plane-wave and single-shot migration by Fourier transform〈/a〉〈br〉 (Temme, P., Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0015.pdf"〉A method of calculating lithosphere thickness from observations of deglacial land uplift and tilt〈/a〉〈br〉 (Wolf, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0016.pdf"〉Volcanoes, fountains, earthquakes, and continental motion – What causes them? 〈/a〉〈br〉 (Kundt, W., Jessner, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0017.pdf"〉Magnetic properties and oxidation experiments with synthetic olivines〈/a〉〈br〉 (Fe〈sub〉χ〈/sub〉Mg〈sub〉1–χ〈/sub〉)〈sub〉2〈/sub〉SiO〈sub〉4〈/sub〉, 0≦χ≦1 (Hoffmann, V., Soffel, H.C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0018.pdf"〉Magnetic mineralogy of basalts from El-Bahnasa and Tahna, Egypt〈/a〉〈br〉 (Wassif, N.A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0020.pdf"〉On the use of line current analogues in geomagnetic depth sounding〈/a〉〈br〉 (Jones, A.G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0021.pdf"〉Observations of the VLF quiet band phenomenon〈/a〉〈br〉 (Matthews, J.P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0022.pdf"〉In memoriam Gustav Adolf Schulze (1911–1986)〈/a〉〈br〉 (Dürschner, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0023.pdf"〉Book reviews〈/a〉〈br〉 (Berckhemer, H., Dieminger, W., Engelhard, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0024.pdf"〉Hydromagnetic waves at low latitudes: a symposium review from the fifth IAGA assembly〈/a〉〈br〉 (Fraser, B.J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0025.pdf"〉Generation and propagation mechanisms of low-latitude magnetic pulsations – A review〈/a〉〈br〉 (Yumoto, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0026.pdf"〉Experimental aspects of low-latitude pulsations - A review〈/a〉〈br〉 (Verö, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0027.pdf"〉GRF broad-band array analysis of the 1982 Miramichi, New Brunswick earthquake sequence〈/a〉〈br〉 (Basham, P.W., Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0028.pdf"〉Rockmagnetism and palaeomagnetism of an early Cretaceous/Late Jurassic dike swarm in Rio Grande do Norte, Brazil〈/a〉〈br〉 (Bücker, C., Schult, A., Bloch, W., Guerreiro, S.D.C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0029.pdf"〉Second Conference on Scientific Ocean Drilling〈/a〉〈br〉 (COSOD II)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0030.pdf"〉Book reviews〈/a〉〈br〉 (Jentzsch, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0031.pdf"〉Deep-seated lateral velocity variations beneath the GRF array inferred from mislocation patterns and P residuals〈/a〉〈br〉 (Faber, S., Plomerová, J., Babuška, V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0034.pdf"〉Lateral variations of the structure of the crust-mantle boundary from conversions of teleseismic 〈i〉P〈/i〉 waves〈/a〉〈br〉 (Qiyuan, L., Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0035.pdf"〉Cross spectral analysis of Swabian Jura (SW Germany) three-component microearthquake recordings〈/a〉〈br〉 (Scherbaum, F., Wendler, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0036.pdf"〉The retrieval of the seismic moment tensor from first-order perturbation theory and generation of compatible models〈/a〉〈br〉 (Lana, X., Correig, A.M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0037.pdf"〉Impulsive processes in the magnetotail during substorm expansion〈/a〉〈br〉 (Sergeev, V.A., Bösinger, T., Lui, A.T.Y)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0038.pdf"〉Spatial and temporal characteristics of impulsive structure of magnetospheric substorm〈/a〉〈br〉 (Sergeev, V.A., Pellinen, R.J., Bösinger, T., Baumjohann, W., Stauning, P., Lui, A.T.Y.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0039.pdf"〉Seismic signal velocity in absorbing media〈/a〉〈br〉 (Schmidt, T., Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0040.pdf"〉In memoriam Nachruf Professor Ludwig Biermann〈/a〉〈br〉 (Treffitz, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0060/LOG_0041.pdf"〉Book Reviews〈/a〉〈br〉 (Korn, M.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Earthquakes ; Earth's Mantle ; Geomagnetic Pulsations ; Germany ; Inverse Problems ; Magnetosphere ; Rock Magnetism ; Seismology ; Seismograms ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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    CITATION GEO-LEO
  • 3
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 49 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:49
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält Artikel zu 41 Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1981.
    Description: Inhaltsverzeichnis: Journal of Geophysics 49 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0011.pdf"〉Palaeomagnetism of a Jurassic Ophiolite Series in East Elba (Italy) 〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0013.pdf"〉Paleomagnetic Evidence from Mesozoic Carbonate Rocks for the Rotation of Sardinia〈/a〉〈br〉 (Horner, F., Lowrie, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0015.pdf"〉A Geotectonic Paradox: Has the Earth Expanded? 〈/a〉〈br〉 (Schmidt, P. W., Embleton, B. J. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0016.pdf"〉Application of Magnetotelluric and DC Electrical Resistivity Methods in the Neapolitan Geothermal Area〈/a〉〈br〉 (Hunsche, U., Rapolla, A., Musmann, G., Alfano, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0018.pdf"〉Velocity Variations in Systems of Anisotropic Symmetry〈/a〉〈br〉 (Crampin, S., Kirkwood, S. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0019.pdf"〉Shear-Wave Singularities of Wave Propagation in Anisotropic Media〈/a〉〈br〉 (Crampin, S., Yedlin, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0020.pdf"〉Temperature Derivatives of Compressional and Shear Wave Velocities in Crustal and Mantle Rocks at 6 kbar Confining Pressure〈/a〉〈br〉 (Kern, H., Richter, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0021.pdf"〉A Crustal Gravity Model of the Mare Serenitatis - Mare Crisium Area of the Moon〈/a〉〈br〉 (Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0022.pdf"〉On the Origin of the Annual Wave in Hemispheric Geomagnetic Activity〈/a〉〈br〉 (Meyer, J., Damaske, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0023.pdf"〉On the Relation Between Magnetic Field-Aligned Electrostatic Electron Acceleration and the Resulting Auroral Energy Flux〈/a〉〈br〉 (Wilhelm, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0024.pdf"〉Application of Different Methods for the Determination of Ionospheric Conductivities from Sounding Rocket Observations〈/a〉〈br〉 (Brüning, K., Baumjohann, W., Wilhelm, K., Stüdemann, W., Urban, A., Ott, W., Spenner, K., Schmidtke, G. L., Fischer, H. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0025.pdf"〉Numerical Experiments on Convection in a Chemically Layered Mantle〈/a〉〈br〉 (Christensen, U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0026.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Raikes, S. A., Engelhard, L., Pape, H., Theile, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0028.pdf"〉Steady State Creep of Fine Grain Granite at Partial Melting〈/a〉〈br〉 (Auer, F., Berckhemer, H., Oehlschlegel, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0029.pdf"〉Laboratory Synthesis of Aluminium-Substituted Titanomaghemites and Their Characteristic Properties〈/a〉〈br〉 (Özdemir, Ö, O’Reilly, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0030.pdf"〉Densities and Magnetic Susceptibilities of Precambrian Rocks of Different Metamorphic Grade〈/a〉〈br〉 (Southern Indian Shield) (Subrahmanyam, C., Verma, R. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0031.pdf"〉Lithospheric Structure and Teleseismic 〈i〉P〈/i〉-Wave Reflection Delays Under Fennoscandia and Siberia〈/a〉〈br〉 (Stewart, Ian C. F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0033.pdf"〉Propagation of Surface Waves in Marine Sediments〈/a〉〈br〉 (Essen, H.-H., Janle, H., Schirmer, F., Siebert, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0035.pdf"〉Simultaneous Observation of an Intense 65 keV Field-Aligned Proton Beam and ULF-waves During a Break-up Event〈/a〉〈br〉 (Stüdemann, W., Goertz, C. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0036.pdf"〉Observations of Field-Aligned Current Sheets Above Discrete Auroral Arcs〈/a〉〈br〉 (Wilhelm, K., Klöcker, N., Theile, B., Ott, W., Spenner, K., Grabowski, R., Wolf, H., Stüdemann, W., Dehmel, G., Fischer, H. M., Schmidtke, G. L., Baumjohann, W., Riedler, W., Urban, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0038.pdf"〉Multi-Method Observations and Modelling of the Three-Dimensional Currents Associated with a Very Strong Ps6 Event〈/a〉〈br〉 (Gustafsson, G., Baumjohann, W., Iversen, I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0040.pdf"〉Variability of Solar EUV Fluxes and Exospheric Temperatures〈/a〉〈br〉 (Schmidtke, G., Börsken, N., Sünder, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0041.pdf"〉Paleomagnetism of Quaternary and Miocene Lavas from North-East and Central Morocco〈/a〉〈br〉 (Najid, D., Westphal, M., Hernandez, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0042.pdf"〉In Memoriam Wilhelm Hiller〈/a〉〈br〉 (Schneider, Götz)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0043.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Wilhelm, H., Neubauer, F. M., Schopper, J. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0044.pdf"〉Joint Two-Dimensional Observations of Ground Magnetic and Ionospheric Electric Fields Associated with Auroral Zone Currents〈/a〉〈br〉 (Inhester, B., Baumjohann, W., Greenwald, R. A., Nielsen, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0045.pdf"〉Current Flow in Auroral Forms Responsible for Ps 6 Magnetic Disturbances〈/a〉〈br〉 (Rostoker, G., Apps, K. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0046.pdf"〉Correlation of Geomagnetic Activity Indices ap with the Solar Wind Speed and the Southward Interplanetary Magnetic Field〈/a〉〈br〉 (Schreiber, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0047.pdf"〉High Time-Resolution Correlation Between the Magnetic Field Behaviour at 37 〈i〉R〈/i〉〈sub〉E〈/sub〉 Distance in the Magnetotail Plasma Sheet and Ground Phenomena During Substrom Expansive Phase〈/a〉〈br〉 (Sergeev, V. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0048.pdf"〉Simultaneous Observations of Energetic Protons Close to the Bow Shock and Far Upstream〈/a〉〈br〉 (Scholer, M., Ipavich, F. M., Gloeckler, G., Hovestadt, D.)〈/a〉〈/li〉 〈li〉〈a href=" https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0049.pdf"〉Non-Adiabatic Expansion of Low-Temperature Solar Wind Radial Temperature Gradients〈/a〉〈br〉 (Geranios, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0050.pdf"〉Correlation Between Seismic Microactivity, Temperature and Subsidence of Water Level at Reservoirs〈/a〉〈br〉 (Merkler, G., Bock, G., Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0052.pdf"〉〈sup〉40〈/sup〉Ar/〈sup〉39〈/sup〉Ar Dating of Himalayan Rocks from the Mount Everest Region〈/a〉〈br〉 (Kaneoka, Ichiro, Kono, Masaru)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0053.pdf"〉A Comparison of the Thermal and Mechanical Structure of the Lithosphere Beneath the Bohemian Massif and the Pannonian Basin〈/a〉〈br〉 (Onuoha, K. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0054.pdf"〉Extremal Models for Electromagnetic Induction in Two-Dimensional Perfect Conductors〈/a〉〈br〉 (Weidelt, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0055.pdf"〉On a Type Classification of Lower Crustal Layers Under Precambrian Regions〈/a〉〈br〉 (Jones, A. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0056.pdf"〉Spherical-Earth Gravity and Magnetic Anomaly Modeling by Gauss-Legendre Quadrature Integration〈/a〉〈br〉 (Frese, R. R. B., Hinze, W. J., Braile, L. W., Luca, A. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0057.pdf"〉Detection Probabilities for Earthquakes in Sweden〈/a〉〈br〉 (Shapira, A., Kulhánek, O., Wahlström, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0058.pdf"〉The Geocyclotron Revisited: Potentialities of Modulated Wave Injection〈/a〉〈br〉 (Brinca, A. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0059.pdf"〉Eine kleine Historie zur Namengebung der Fachdisziplin Geophysik〈/a〉〈br〉 (Buntebarth, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0049/LOG_0060.pdf"〉〈i〉Correction〈/i〉: High Precision Measurement of the Frequency of Mode 〈sub〉0〈/sub〉S〈sub〉0〈/sub〉〈/a〉〈br〉 (Zürn, W., Knopoff, L., Rydelek, P. A.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aeronomy ; Aurora ; Canada ; Electromagnetism ; Geomagnetism ; Geomagnetismus ; Geophysics ; Geophysik ; Himalaya ; India ; Ionosphere ; Ionosphäre ; Italy ; Lithosphere ; Lithosphäre ; Magnetotellurics ; Magnetotellurik ; Moon ; Morocco ; Palaeomagnetism ; Paläomagnetismus ; Rock Magnetism ; Seismology ; Seismologie ; Siberia ; Waves ; Wellen ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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    CITATION GEO-LEO
  • 4
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 41 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:41
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 58 Artikel zu Themengebieten der Seismologie, Erdmagnetismus und Gesteinsphysik veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1975.
    Description: Inhaltsverzeichnis: Journal of Geophysics 41 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0011.pdf"〉Statistical Behaviour of Elastic Waves in a Reverberating Solid〈/a〉〈br〉 (Drisler, J., Antony-Spies, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0013.pdf"〉A Compressed Air Gun Accelerator for Shock Magnetization and Demagnetization Experiments up to 20 kbar〈/a〉〈br〉 (Hornemann, U., Pohl, J., Bleil, U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0014.pdf"〉Shock Magnetization and Demagnetization of Basalt by Transient Stress up to 10 kbar〈/a〉〈br〉 (Pohl, J., Bleil, U., Hornemann, U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0015.pdf"〉K-Ar-Altersbestimmungen an Vulkaniten bekannter paläomagnetischer Feldrichtung〈/a〉〈br〉 (Todt, W., Lippolt, H. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0017.pdf"〉Dispersed Shots at Optimum Depth - An Efficient Seismic Source for Lithospheric Studies〈/a〉〈br〉 (Jacob, A. W. B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0018.pdf"〉Crustal Structure and 〈i〉P〈/i〉-Wave Travel Time Anomalies at NORSAR〈/a〉〈br〉 (Berteussen, K. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0019.pdf"〉Electromagnetic Induction in Three-Dimensional Structures〈/a〉〈br〉 (Weidelt, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0021.pdf"〉Acoustic Normal Modes Generated by Explosive Sources〈/a〉〈br〉 (Essen, H.-H., Kebe, H.-W., Siebert, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0022.pdf"〉Hydromagnetic Waves in a Non-Uniform Plasma〈/a〉〈br〉 (Kupfer, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0023.pdf"〉Time-Domain Electromagnetic INPUT Rresponse of a Conducting Horizontal Thin Sheet〈/a〉〈br〉 (Mallick, K., Jain, S. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0024.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Walk, O.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0025.pdf"〉Seismic Investigation along the Scandinavian "Blue Road" Traverse〈/a〉〈br〉 (Hirschleber, H. B., Lund, C.-E., Meissner, R., Vogel, A., Weinrebe, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0028.pdf"〉Computations of 〈i〉SV〈/i〉 Waves in Realistic Earth Models〈/a〉〈br〉 (Kind, R., Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0030.pdf"〉On Tracing Seismic Rays with Specified End Points〈/a〉〈br〉 (Chander, Ramesh)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0031.pdf"〉Geothermal Models of the Ivrea-Zone〈/a〉〈br〉 (Höhndorf, A., Haenerl, R., Giesel, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0033.pdf"〉A Note on the Palaeomagnetism of the Late Precambrian Malani Rhyolites near Jodhpur - India〈/a〉〈br〉 (Klootwijk, C. T.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0035.pdf"〉An Evaluation Method Combining the Differential Doppler Measurements from Two Stations that Enables the Calculation of the Electron Content of the Ionosphere〈/a〉〈br〉 (Leitinger, R., Schmidt, G., Tauriainen, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0037.pdf"〉Measured and Calculated Secondary Electron Energy Spectra (20 - 1500 eV) above 120 km〈/a〉〈br〉 (Loidl, A., Schlegel, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0038.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Mayer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0039.pdf"〉The Behaviour of Minor Species in the Solar Wind〈/a〉〈br〉 (Ryan, J. M., Axford, W. I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0040.pdf"〉The Effect of Low Energetic Electrons in the Polar Ionosphere〈/a〉〈br〉 (Hartmann, G. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0041.pdf"〉Transmission of Electric Fields and Photoelectron Fluxes Between Conjugate Ionospheric F2-Regions〈/a〉〈br〉 (Petelski, E. F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0043.pdf"〉Characteristics of Azimuth Independent Optimum Velocity Filters Designed for Two-Dimensional Arrays〈/a〉〈br〉 (Hubral, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0045.pdf"〉Travel Time Residuals in the Iranian Plateau〈/a〉〈br〉 (Akasheh, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0046.pdf"〉Noise Variance Fluctuations and Earthquake Detectability〈/a〉〈br〉 (Steinert, O., Husebye, S., Gjøystdal, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0048.pdf"〉An Electronic Filter and Damping System for the Askania Borehole Tiltmeter〈/a〉〈br〉 (Flach, D., Große-Brauckmann, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0049.pdf"〉Two-Dimensional Magnetotelluric Model Calculations for Overhanging, High-Resistivity Structures〈/a〉〈br〉 (Losecke, W., Müller, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0052.pdf"〉A New Type of Vertical Gravity Gradiometer〈/a〉〈br〉 (Groten, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0053.pdf"〉Letters to the Editors: Comment on Hydromagnetic Waves in a Non-Uniform Plasma by E. Kupfer〈/a〉〈br〉 (Siebert, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0054.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Wilhelm, H., Burkhardt, H., Strobach, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0055.pdf"〉Deep Structure of the Southern Rhinegraben Area from Seismic Refraction Investigations〈/a〉〈br〉 (Edel, J. B., Fuchs, K., Gelbke, C., Prodehl, C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0058.pdf"〉Faeroe Islands - a Microcontinental Fragment? 〈/a〉〈br〉 (Casten, U., Hedebol Nielsen, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0059.pdf"〉A Seismic Reflection Method for Solving Engineering Problems〈/a〉〈br〉 (Schepers, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0061.pdf"〉The Palaeomagnetism of Age Dated Tertiary Volcanites of the Monti Lessini (Northern Italy) and its Implication to the Rotation of Northern Italy〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0064.pdf"〉Rock Magnetism of the Monti Lessini and Monte Berici Volcanites and Age of Volcanism Deduced from the Heirtzler Polarity Time Scale〈/a〉〈br〉 (Soffel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0065.pdf"〉Supersonic Plasma Flow Between High Latitude Conjugate Ionospheres〈/a〉〈br〉 (Rösler, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0066.pdf"〉Crustal Structure of the Aegean Sea and the Hellenides Obtained from Geophysical Surveys〈/a〉〈br〉 (Makris, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0068.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Neubauer, F. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0069.pdf"〉Synthetic Seismograms of PS-Reflections from Transition Zones Computed with the Reflectivity Method〈/a〉〈br〉 (Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0071.pdf"〉Explosions in Shallow Water for Deep Seismic Sounding Experiments〈/a〉〈br〉 (Burkhardt, H., Vees, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0073.pdf"〉Seegangserzwungene elastische Bewegungen des Nordseebodens〈/a〉〈br〉 (Janle, P., Rudloff, R., Schmalfeldt, B., Szelwis, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0077.pdf"〉Interpretation of a Gravity Profile Across the Southern Part of the Hon Graben, Libya〈/a〉〈br〉 (Soffel, H., Peters, K., Pohl, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0079.pdf"〉A Comparison of Methods for Computing Surface Densities of the Geopotential from Satellite Altimetry〈/a〉〈br〉 (Benning, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0080.pdf"〉An Economically Working Method for Computing the Gravimetric Terrain Correction〈/a〉〈br〉 (Boedecker, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0081.pdf"〉Pressure Dependence of Elastic Wave Characteristics of Ultramafic Rocks of India〈/a〉〈br〉 (Ramana, Y. V., Rao, M. V. M. S., Gogte, B. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0082.pdf"〉Paleogravity - A Possible Chance for Determination of Paleo-Geographic North〈/a〉〈br〉 (Stegena, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0083.pdf"〉Electromagnetic Induction at Dili, Portuguese Timor〈/a〉〈br〉 (Chamalaun, F. H., White, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0084.pdf"〉Preliminary Polar Wander Path of Central Iran〈/a〉〈br〉 (Soffel, H., Förster, H., Becker, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0085.pdf"〉Ein astasiertes Vertikalpendel mit tragender Blattfeder〈/a〉〈br〉 (Wielandt, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0086.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Schneider, G., Suchy, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0087.pdf"〉Wave and Particle Observations by Explorer 45 Pertaining to Wave-Particle Interactions〈/a〉〈br〉 (Fritz, T. A., Williams, D. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0093.pdf"〉Probability Distribution of Earthquake Accelerations with Applications to Sites in the Northern Rhine Area, Central Europe〈/a〉〈br〉 (Ahorner, L., Rosenhauer, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0095.pdf"〉〈i〉P〈/i〉 Wave Amplitude Variability at NORSAR〈/a〉〈br〉 (Berteussen, K. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0096.pdf"〉Magnetic Hysteresis Loops and Magnetization Versus Temperature Curves of Some Basalt Samples Containing Titanomagnetite Ore either Single-Phase or with an Intergrowth of Ilmenite Lamellae〈/a〉〈br〉 (Schmidbauer, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0098.pdf"〉The Change of Isothermal Saturation Rremanent Magnetization of Basalts as a Result of Cyclic Elastic Deformation〈/a〉〈br〉 (Kapička, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0100.pdf"〉K-Ar-Altersbestimmungen an Vulkaniten bekannter paläomagnetischer Feldrichtung, II. Sachsen〈/a〉〈br〉 (Todt, W., Lippolt, H. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0102.pdf"〉An Anomaly of the Upper Mantle Below the Rhine Graben, Studied by the Inductive Response of Natural Electromagnetic Fields〈/a〉〈br〉 (Reitmayr, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0103.pdf"〉Some Problems of Large-Scale Gravity Interpretation〈/a〉〈br〉 (Groten, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0041/LOG_0106.pdf"〉[Rezensionen] 〈/a〉〈br〉 (Haack, V., Höschele, K.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aegan Sea ; Applied Geophysics ; Seismology ; Atlantic Ocean ; Electrical Conductivity Anomalies ; Crustal Structure ; Doppler Effect ; Earthquakes ; Electromagnetism ; Faeroe Islands ; Germany ; Gravimetrie ; Gravimetry ; Greece ; India ; Ionosphere ; Ionosphäre ; Iran ; Libya ; Magnetosphere ; Paleomagnetism ; Rock Magnetism ; Seismology ; Solar Wind ; Tiltmeter ; Elastic Wave ; Volcanics ; Waves ; Wellen ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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    CITATION GEO-LEO
  • 5
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    Journal of Geophysics - Zeitschrift für Geophysik 43 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:43
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 78 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1977.
    Description: Inhaltsverzeichnis: Journal of Geophysics 43 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0012.pdf"〉Editors' Preface〈/a〉〈br〉 (Fuchs, K., Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0013.pdf"〉Full Wave Theory Applied to a Discontinuous Velocity Increase: The Inner Core Boundary〈/a〉〈br〉 (Cormier, V. F., Richards, P. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0016.pdf"〉Propagation of Elastic Waves in Vertically Inhomogeneous Media〈/a〉〈br〉 (Ungar, A., Ilan, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0017.pdf"〉Finite-Difference Modelling for P-Pulse Propagation in Elastic Media with Arbitrary Polygonal Surface〈/a〉〈br〉 (Ilan, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0020.pdf"〉Extension of Matrix Methods to Structures with Slightly Irregular Stratification〈/a〉〈br〉 (Cisternas, A., Jobert, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0021.pdf"〉Modal Approach to Wave Propagation in Layered Media with Lateral Inhomogeneities〈/a〉〈br〉 (Saastamoinen, P. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0022.pdf"〉On the Propagation of Seismic Pulses in a Porous Elastic Solid〈/a〉〈br〉 (Mainardi, F., Servizi, G., Turchetti, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0023.pdf"〉Three-Dimensional Seismic Ray Tracing〈/a〉〈br〉 (Julian, B. R., Gubbins, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0025.pdf"〉On Geophysical Inverse Problems and Constraints〈/a〉〈br〉 (Sabatier, P. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0027.pdf"〉On Impulse Response Data and the Uniqueness of the Inverse Problem〈/a〉〈br〉 (Barcilon, V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0028.pdf"〉Least-Squares Collocation and the Gravitational Inverse Problem〈/a〉〈br〉 (Moritz, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0029.pdf"〉The Statistical Description and Interpretation of Geophysical Potential Fields Using Covariance Functions〈/a〉〈br〉 (Kautzleben, H., Harnisch, M., Schwahn, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0030.pdf"〉A Finite Element Program Package for Electromagnetic Modeling〈/a〉〈br〉 (Kaikkonen, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0032.pdf"〉Linear Inverse Problem in Gravity Profile Interpretation〈/a〉〈br〉 (Vigneresse, J. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0034.pdf"〉Data Seizing and Information Processing〈/a〉〈br〉 (Picard, C. F., Sallantin, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0035.pdf"〉Formal Morphostructural Zoning of Mountain Territories〈/a〉〈br〉 (Alekseevskaya, M., Gabrielov, A., Gel’fand, I., Gvishiani, A., Rantsman, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0036.pdf"〉Three Dimensional Seismic Velocity Anomalies in the Lithosphere〈/a〉〈br〉 (Aki, Keiiti)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0038.pdf"〉The Inversion of Long Range Seismic Profiles〈/a〉〈br〉 (Kennett, B. L. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0040.pdf"〉An Oceanic Long Range Explosion Experiment〈/a〉〈br〉 (Orcutt, J. A., Dorman, L. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0041.pdf"〉The Upper Mantle Under Western Europe Inferred from the Dispersion of Rayleigh Modes〈/a〉〈br〉 (Nolet, Guust)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0044.pdf"〉Global and Regional Phase Velocities of Long-Period Fundamental Mode Rayleigh Waves〈/a〉〈br〉 (Mitronovas, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0045.pdf"〉The Inversion of Surface Wave Dispersion Data with Random Errors〈/a〉〈br〉 (Knopoff, L., Chang, F.-S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0048.pdf"〉Finite Difference Calculation of Stress Relaxation Earthquake Models〈/a〉〈br〉 (Stöckl, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0050.pdf"〉On Equivalent Models of Seismic Sources〈/a〉〈br〉 (Jobert, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0051.pdf"〉A Method for Synthesis of the Seismic Coda of Local Earthquakes〈/a〉〈br〉 (Herrmann, R. B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0055.pdf"〉Application of Two-Timing Methods in Statistical Geophysics〈/a〉〈br〉 (Hasselmann, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0056.pdf"〉Scattered Waves in the Coda of P〈/a〉〈br〉 (Hudson, J. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0057.pdf"〉Elastic Wave Propagation in a Highly Scattering Medium – A Diffusion Approach〈/a〉〈br〉 (Dainty, A. M., Toksöz, M. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0058.pdf"〉Seismic Energy Transmission in an Intensively Scattering Environment〈/a〉〈br〉 (Nakamura, Yosio)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0060.pdf"〉Scattering of Rayleigh Waves by a Ridge〈/a〉〈br〉 (Sabina, F. J., Willis, J. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0061.pdf"〉Mean-Field Electrodynamics and Dynamo Theory of the Earth's Magnetic Field〈/a〉〈br〉 (Krause, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0064.pdf"〉An Example of Nonlinear Dynamo Action〈/a〉〈br〉 (Busse, F. H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0065.pdf"〉Energetics of the Earth's Core〈/a〉〈br〉 (Gubbins, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0066.pdf"〉Equation of State of Liquid Iron at the Earth's Core Conditions〈/a〉〈br〉 (Boschi, E., Mulargia, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0067.pdf"〉Lithospheric Slab Penetration into the Lower Mantle beneath the Sea of Okhotsk〈/a〉〈br〉 (Jordan, T. H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0069.pdf"〉〈i〉Abstracts and Short Communications〈/i〉〈/a〉〈br〉〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0068.pdf"〉Phenomenological Representation of Seismic Sources〈/a〉〈br〉 (Backus, G., Mulcahy, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0070.pdf"〉The Influence of the Core and the Oceans on the Chandler Wobble〈/a〉〈br〉 (Dahlen, F. A., Smith, M. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0071.pdf"〉The Earth's Core-Mantle Interface Revisited〈/a〉〈br〉 (Hide, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0072.pdf"〉Seismic Observations of Structure and Physical Properties of the Subcrustal Lithosphere as Evidence for Dynamical Processes in the Upper Mantle〈/a〉〈br〉 (Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0073.pdf"〉Seismic Anisotropy – a Summary〈/a〉〈br〉 (Crampin, Stuart)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0074.pdf"〉Precise Continuous Monitoring of Seismic Velocity Variations〈/a〉〈br〉 (Bungum, H., Risbo, T., Hjortenberg, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0075.pdf"〉On the Computation of Theoretical Seismograms for Multimode Surface Waves〈/a〉〈br〉 (Calcagnile, G., Panza, G. F., Schwab, F., Kausel, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0076.pdf"〉On the Excitation of the Earth's Seismic Normal Modes〈/a〉〈br〉 (Vlaar, N. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0077.pdf"〉Seismic Velocities and Density of an Attenuating Earth〈/a〉〈br〉 (Hart, R. S., Anderson, D. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0078.pdf"〉A First-Motion Alternative to Geometrical Ray Theory〈/a〉〈br〉 (Chapman, C. H., Dey Sarkar, S. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0079.pdf"〉Heterogeneous Velocity Structure at the Base of the Mantle〈/a〉〈br〉 (Snoke, J. A., Sacks, I. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0080.pdf"〉Heterogeneous velocity structure at the base of the mantle〈/a〉〈br〉 (Sacks, I. S., Snoke, J. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0081.pdf"〉Theoretical Seismograms of Core Phases Calculated by a Frequency-Dependent Full Wave Theory, and Their Interpretation〈/a〉〈br〉 (Choy, G. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0082.pdf"〉Amplitudes of Long-Period PcP, SKS and SKKS and the Structure at the Base of the Mantle and in the Outer Core〈/a〉〈br〉 (Müller, G., Kind, R., Mula, A., Gregersen, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0083.pdf"〉Relative Errors in Group Velocity Measurements〈/a〉〈br〉 (Knopoff, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0084.pdf"〉The Propagation of Plasma Waves in the Jovian Magnetosphere〈/a〉〈br〉 (Denskat, K. U., Neubauer, F. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0085.pdf"〉Statistical Theory of Electromagnetic Induction in Thin Sheets〈/a〉〈br〉 (Treumann, R., Schäfer, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0086.pdf"〉Precursors to P' P' and Upper Mantle Discontinuities〈/a〉〈br〉 (Husebye, E. S., Haddon, R. A. W., King, D. W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0090.pdf"〉Mantle Heterogeneity and Mislocation Patterns for Seismic Networks〈/a〉〈br〉 (Vermeulen, J. M., Doornbos, D. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0093.pdf"〉Correlation Between Micro-Activity and Variation of Water Level at the Schlegeis-Reservoir〈/a〉〈br〉 (Blum, R., Bock, G., Fuchs, K., Merkler, G., Widmann, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0095.pdf"〉Attenuation Coefficients of Acoustic Normal Modes in Shallow Water〈/a〉〈br〉 (Essen, H.-H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0096.pdf"〉Relation of Gravity to Elevation in Zambia〈/a〉〈br〉 (Töpfer, K. D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0098.pdf"〉Albert Defant (1884 - 1974) 〈/a〉〈br〉 (Krauß, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0099.pdf"〉Study of the Structure of the Lower Lithosphere by Explosion Seismology in the USSR〈/a〉〈br〉 (Ryaboy, V. Z.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0102.pdf"〉P-Wave Amplitudes and Sources of Scattering in 〈i〉m〈/i〉〈sub〉b〈/sub〉-Observations〈/a〉〈br〉 (Ringdal, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0104.pdf"〉Analyse von Mikroseismikmessungen auf Sylt〈/a〉〈br〉 (Szelwis, R., Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0107.pdf"〉Improved Technique for Rapid Interpretation of Gravity Anomalies Caused by Two-Dimensional Sedimentary Basins〈/a〉〈br〉 (Töpfer, K. D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0109.pdf"〉Investigation of Isostasy by Computing the Correlation Coefficients between Elevations and Bouguer Anomalies〈/a〉〈br〉 (Janle, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0110.pdf"〉Geoelectrical Deep Soundings in Southern Africa Using the Cabora Bassa Power Line〈/a〉〈br〉 (Blohm, E. K., Worzyk, P., Scriba, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0112.pdf"〉Spectral Characteristics of Cross-Field and Two Stream Instability as Revealed by Rocket Borne Studies〈/a〉〈br〉 (Gupta, S. P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0113.pdf"〉〈i〉Short Communication〈/i〉 Observation of PS Reflections from the Moho〈/a〉〈br〉 (Jacob, A. W. B., Booth, D. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0115.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Makris, J., Weigel, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0116.pdf"〉Planetarische Dynamos〈/a〉〈br〉 (Stix, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0117.pdf"〉〈i〉Original Investigations〈/i〉 A Note on the Post-Rosenbluth Quasilinear Diffusion Coefficient in the Ring Current Region〈/a〉〈br〉 (Treumann, R., Grafe, A., Lehmann, H.-R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0118.pdf"〉Remote Sensing Experiment for Magnetospheric Electric Fields Parallel to the Magnetic Field〈/a〉〈br〉 (Wilhelm, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0119.pdf"〉A Study of the Echzell/Wetterau Earthquake of November 4, 1975〈/a〉〈br〉 (Neugebauer, H. J., Tobias, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0121.pdf"〉Thermoelastic Deformations of a Half-Space – A Green's Function Approach〈/a〉〈br〉 (Müller, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0123.pdf"〉Gravity Variations with Time in Northern Iceland 1965–1975〈/a〉〈br〉 (Torge, W., Drewes, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0125.pdf"〉High Resolution Near Surface Reflection Measurements Using a Vertical Array Technique〈/a〉〈br〉 (Schepers, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0127.pdf"〉Ausbreitung von Rayleigh-Kanalwellen in Steinkohleflözen – Modellseismische Untersuchungen〈/a〉〈br〉 (Freystätter, S., Dresen, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0129.pdf"〉Comment on: Hydromagnetic Waves in a Non-Uniform Plasma〈/a〉〈br〉 (Kupfer, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0130.pdf"〉〈i〉Book Reviews〈/i〉〈/a〉〈br〉 (Kisslinger, C., Klußmann, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0043/LOG_0131.pdf"〉〈i〉Erratum〈/i〉 Full Wave Theory Applied to a Discontinuous Velocity Increase: The Inner Core Boundary〈/a〉〈br〉 (Cormier, V. F., Richards, P. G.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: Dynamo Theory
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Africa ; Dynamo Theory ; Earthquakes ; Earth's Core ; Engineering Seismics ; Seismology ; Seismologie ; Geomagnetism ; Gravity ; Iceland ; Lithosphere ; Lithosphäre ; Magnetosphere ; Plasma Waves ; Seismic Waves ; Waves ; Wellen ; Geophysik ; Geophysics ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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    Zeitschrift für Geophysik 36 / 5 (2019)
    Physika-Verlag, Würzburg
    In:  Herausgeberexemplar | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1970.
    Description: 〈ul style="line-height:2;"〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0113.pdf"〉Heft 5〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0114.pdf"〉Titelseite〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0115.pdf"〉Inhaltsverzeichnis〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0116.pdf"〉[Impressum]〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0117.pdf"〉A Possible Scattering Mechanism for Lunar Seismic Waves (Berckhemer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0119.pdf"〉On the Determination of Velocity Depth Distributions of Elastic Waves from the Dynamic Characteristics of the Reflected Wave Field (Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0125.pdf"〉Auswertung seeseismischer Messungen mit einer digitalen Methode unter Anwendung der Theorie der Schallwellenausbreitung im Flachwasser (Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0128.pdf"〉On Chemical Magnetization in Some Permian Lava Flows of Southern Norway (Storetvedt, K. M., Petersen, N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0132.pdf"〉Auswertung von Gravimeter-Messungen in der Münchberger Gneismasse längs eines Profils von Konradsreuth nach Niederlamitz (Soffel, H., Peters, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0133.pdf"〉Deutung der Schwereanomalien im Nördlinger Ries (Kahle, H.-G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0135.pdf"〉Eine Methode zur direkten Bestimmung der sogenannten "Geometrischen Tortuosität" (Bitterlich, W., Wöbking, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0137.pdf"〉Observations With Synchronously-Offset Beams on a 77 km path at 1.8 and 4 cm (Jeske, H., Seehars, H. D., Pucher, G., Cassebaum, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0139.pdf"〉Scattering of Seismic Waves and Lunar Seismograms (Strobach, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0140.pdf"〉Berechnung eines Stromsystems in der Polaren E-Region (Czechowsky, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0141.pdf"〉Mitteilung〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0142.pdf"〉Buchbesprechungen (Zürn, W., Seiler, E., Theile, B., Diem, Walk, )〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0143.pdf"〉[Werbung]〈/a〉〈/li〉 〈/ul〉
    Description: research
    Description: DFG, SUB Göttingen, DGG
    Keywords: 550 ; Geophysik ; Erdmagnetismus ; Geomagnetismus ; Gravitation ; Gravimetrie ; Seismik ; Seismology ; Strahlung ; Wellen ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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  • 7
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    Analysis of the source parameters behaviour during the Val D'Agri test-injection (Italy) (2019)
    Details
    Publication Date: 2019-03-27
    Description: Recent advances in understanding induced earthquake mechanics are due to the new and high-quality observations from seismic signals, natural faults and laboratory experiments. The synergy of different approaches allows the acquisition of useful observations to understand the earthquake source process. In this study we investigate the source parameters behaviour of induced earthquakes recorded during daily injection tests in a wastewater disposal well in Val D’Agri (VDA, Italy). We choose this area because of its complexity and particularity. VDA is a Quaternary extensional basin located in the Southern Apennines characterized by a complex tectonic evolution, high seismic hazard and significant hydrocarbon exploitation. The basin hosts the largest onshore oilfield in Europe that produces oil and associated gas from low- porosity, fractured Cretaceous limestone. Wastewater associated to hydrocarbon production is reinjected into the Costa Molina 2 high-rate well (CM2) into an unproductive marginal portion of the carbonate reservoir at 2890-3096 m depth (b.s.l.). Initial injection tests were performed from 2 to 12 June 2006 with variable duration (from 4 to 32 hr) and hourly injection rate of 38 m3/hr. During the tests a maximum well-head pressure of 101 bar was measured. These tests induced a swarm microseismicity (69 events, ML comprised by 0.3 and 1.8) recorded by a high-performance local network run by INGV (Mc 0.4, 23 stations) that constitutes our testing data-set. We investigate the full moment tensors decomposing them in Double-Couple (DC), Isotropic (ISO) and Compensated Linear Vector Dipole (CLVD) components by using HybridMT technique. We obtain significant contribution of %ISO and %CLVD components that tend to increase with time. Also, we compute the moment magnitudes (that we compare with ML) and the static stress drops (by spectral analysis). Finally, we discuss each analysed source parameter as a function of the injection pressure curve in the geological/tectonic contest.
    Description: Published
    Description: Malta
    Description: 3T. Sorgente sismica
    Keywords: Seismology ; Source Analysis ; Solid Hearth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 8
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    AlpArray in Hungary: temporary and permanent seismological networks in the transition zone between the Eastern Alps and the Pannonian basin (2019)
    Details
    Publication Date: 2019-03-07
    Description: In the last few decades dense large-scale seismic networks showed their importance in studying the structure of the lithosphere and the upper mantle. The better understanding of the Apennines–Alps–Carpathian–Dinarides system is the main target of the AlpArray European international initiative in which more than 50 institutes are involved. The core of AlpArray is the AlpArray Seismic Network (AASN). With its 􏰖 600 broadband seismic stations ( 􏰖 280 of which are temporary) the AASN is, so far, the largest passive seismic experiment in Europe. The MTA CSFK Geodetic and Geophysical Insti- tute, as a Core Member of the AlpArray project, contributes to the AlpArray Seismic Network with its entire permanent network as well as with 11 temporary broadband seismic stations deployed in Western Hungary. Three additional station equipment were provided by the Swiss-AlpArray SINERGIA program. The average station distance together with the permanent stations is around 40 km in the area of interest. The temporary network has been installed between December 2015 and July 2016 and the planned operation period is 3 years. In this paper we describe the characteristics of the 29 per- manent and temporary stations, introducing not only the equipment, but the location, housing and geological setting, as well. We present median power spectral density curves in order to characterise the noise conditions at each station.
    Description: Hungarian Academy of Sciences (Grants EU-04/2014, EU-07/2015); Swiss-AlpArray SINERGIA Project CRSII2_154434/1 by the Swiss National Science Foundation (SNSF)
    Description: Published
    Description: 221–245
    Description: 1IT. Reti di monitoraggio
    Description: 5IT. Osservatori
    Description: JCR Journal
    Keywords: AlpArray ; Temporary seismic network ; Seismic noise ; Hungarian National Seismological Network ; Pannonian basin ; Solid Earth ; Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Journal of Geophysics - Zeitschrift für Geophysik 59 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 32 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1983.
    Description: Inhaltsverzeichnis: Journal of Geophysics 59 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0011.pdf"〉The detailed velocity structure of the Urach geothermal anomaly〈/a〉〈br〉 (Walther, C., Trappe, H., Meissner, R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0012.pdf"〉The effect of 〈i〉SKS〈/i〉 scattering on models of the shear velocity-structure of the D" region〈/a〉〈br〉 (Lay, T., Young, C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0013.pdf"〉Spheroidal and torsional global response functions〈/a〉〈br〉 (Wilhelm, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0014.pdf"〉Magnetometer array studies on southeastern Finland on the Baltic shield〈/a〉〈br〉 (Pajunpää, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0016.pdf"〉Magnetovariational and magnetotelluric studies of the Oulu anomaly on the Baltic Shield in Finland〈/a〉〈br〉 (Korja, T., Zhang, P., Pajunpää, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0018.pdf"〉Glacio-isostatic adjustment in Fennoscandia revisited〈/a〉〈br〉 (Wolf, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0019.pdf"〉Modelling active audio-magnetotelluric data〈/a〉〈br〉 (Fischer, G., Schnegg, P.-A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0020.pdf"〉A comparison of upper mantle subcontinental electrical conductivity for North America, Europe, and Asia〈/a〉〈br〉 (Campbell, W. H., Schiffmacher, E. R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0021.pdf"〉Paleomagnetism of the tertiary intrusives from Chalkidiki (northern Greece)〈/a〉〈br〉 (Kondopoulou, D., Westphal, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0022.pdf"〉Absolute intensity of daytime whistlers at low and middle latitudes and its latitudinal variation〈/a〉〈br〉 (Hayakawa, M., Tanaka, Y., Ohta, K., Okada, T.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0023.pdf"〉Electric fields and currents at the Harang discontinuity: a case study〈/a〉〈br〉 (Kunkel, T., Baumjohann, W., Untiedt, J., Greenwald, R. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0024.pdf"〉〈i〉Erratum.〈/i〉 In-situ permeability from non-dilatational soil deformation caused by groundwater pumping – a case study〈/a〉〈br〉 (Kümpel, H.-J., Lohr, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0025.pdf"〉Book reviews〈/a〉〈br〉 (Jentzsch, G., Jacoby, W.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0026.pdf"〉A conceptual model of core dynamics and the earth's magnetic field〈/a〉〈br〉 (Officer, C. B.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0027.pdf"〉Paleomagnetism of Miocene volcanism from South Syria〈/a〉〈br〉 (Roperch, P., Bonhommet, N.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0028.pdf"〉Periadriatic lineament in the Alps studied by magnetotellurics〈/a〉〈br〉 (Ádám, A., Duma, G., Gutdeutsch, R., Verő, J., Wallner, Á.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0031.pdf"〉Comparison of fault-plane solutions and moment tensors〈/a〉〈br〉 (Hinzen, K.-G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0032.pdf"〉A teleseismic study of the Upper Rhinegraben area: array mislocation diagram and 3-D velocity inversion〈/a〉〈br〉 (Granet, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0033.pdf"〉Interactive high-resolution polarization analysis of broad-band seismograms〈/a〉〈br〉 (Plešinger, A., Hellweg, M., Seidl, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0035.pdf"〉The relationship between the polarization of whistlers and their dispersion〈/a〉〈br〉 (Shimakura, S., Okada, T., Hayakawa, M., Tanaka, Y.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0036.pdf"〉A simple statistical model on the degree of interconnection on partially molten rocks〈/a〉〈br〉 (Schmeling, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0037.pdf"〉Book reviews〈/a〉〈br〉 (Hansen, C. J., Jentzsch, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0038.pdf"〉Complete seismogram synthesis for transversely isotropic media〈/a〉〈br〉 (Mandal, B., Mitchell, B. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0039.pdf"〉The influence of a dilatant region in the Earth's crust on the Earth tide tilt and strain〈/a〉〈br〉 (Kirsch, R., Zschau, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0040.pdf"〉The influence at atmospheric loading on VLBI-experiments〈/a〉〈br〉 (Rabbel, W., Schuh, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0041.pdf"〉Discrete frequency inequalities for magnetotelluric impedances of one-dimensional conductors〈/a〉〈br〉 (Weidelt, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0042.pdf"〉Thermally stimulated currents in rocks〈/a〉〈br〉 (Dologlou-Revelioti, E., Varotsos, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0043.pdf"〉Magnetostratigraphy of Neogene equatorial Pacific pelagic sediments〈/a〉〈br〉 (Weinreich, N., Theyer, F.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0045.pdf"〉Deconvolution as a method for the separation of Pi2 pulsations from background field variations〈/a〉〈br〉 (Behrens, J., Glaßmeier, K.-H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0046.pdf"〉〈i〉Laudatio〈/i〉. Presentation of the Emil Wiechert Medal to Don L. Anderson, Pasadena〈/a〉〈br〉 (Soffel, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0047.pdf"〉〈i〉Correction〈/i〉. A comparison of upper mantle subcontinental electrical conductivity for North America, Europe and Asia〈/a〉〈br〉 (Campbell, W. H., Schiffmacher, E. R.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0059/LOG_0048.pdf"〉Book reviews〈/a〉〈br〉 (Kertz, W., Schwentek, H., Jacoby, W. R.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DGG, DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; Alps ; Broad-band seismology ; Deconvolution ; Deep Sea Drilling Project ; Deformation of earth’s surface ; Dilatancy ; Dynamo theory ; Earth currents ; Earth tides ; Earth’s core ; Earth’s crust ; Earth’s Mantle ; Electrical Conductivity of the Earth ; Electromagnetic Induction ; Fault plane solutions ; Free oscillations of earth ; Geomagnetic pulsations ; Geothermics ; Germany ; Global positioning ; Gräfenberg seismic array ; Greece ; Harang discontinuity ; Inverse problems ; lonospheric electric field ; lsostasy ; Magnetic field of earth ; Magnetometer array studies ; Magnetosphere ; Magnetostratigraphy ; Magnetotellurics ; Pacific ; Paleomagnetism ; Partial melts ; Polar ionosphere ; Polar magnetic substorms ; Rhinegraben ; Rock Physics ; Scandinavia ; Seismics ; Seismic Moment tensor ; Seismic wave propagation ; Seismology ; Synthetic seismograms ; Syria ; Very Long Baseline Interferometry ; Viscosity of earth’s mantle ; Whistlers ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 10
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    Zeitschrift für Geophysik 36 / 4 (2019)
    Physika-Verlag, Würzburg
    In:  Herausgeberexemplar | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält Artikel zu Themengebieten des Erdmagnetismus und der Ionosphäre, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1970.
    Description: 〈ul style="line-height:2;"〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0088.pdf"〉Heft 4〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0089.pdf"〉Titelseite〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0090.pdf"〉Inhaltsverzeichnis〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0091.pdf"〉[Impressum]〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0092.pdf"〉Geophysics and Germany, Men and Enterprises (Chapman, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0093.pdf"〉Investigation of the Auroral Electrojet (Heinrich, H., Reimer, D., Siemann, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0095.pdf"〉Plasmamessungen im Polarlicht-Elektrojet und daraus erschlossene elektrische Felder (Kist, R., Spenner, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0097.pdf"〉Polarisationsmessungen an künstlichen Bariumwolken (Möller, G. F., Haser, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0098.pdf"〉Der Forschungssatellit AZUR (Keppler, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0101.pdf"〉Crustal Structure of the Western United States from Seismic-Refraction Measurements in Comparison with Central European Results (Prodehl, C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0105.pdf"〉MARS 66. Eine Magnetbandapparatur für seismische Tiefensondierung (Berckheimer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0109.pdf"〉Recordings with Askania Gravimeters Before and After Important Earthquakes (Kizawa, T.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0111.pdf"〉Ergänzung zu "In memoriam Otto Lucke" (Heft 6/1969, S. 6-8) (Fanselau, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN101433392X_0036/LOG_0112.pdf"〉[Werbung]〈/a〉〈/li〉 〈/ul〉
    Description: research
    Description: DFG, SUB Göttingen, DGG
    Keywords: 550 ; Geophysik ; Erdmagnetismus ; Geomagnetismus ; Geophysik ; Ionosphäre ; Ionosphere ; Seismik ; Seismology ; Strahlung ; Wellen ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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  • 11
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    Journal of Geophysics - Zeitschrift für Geophysik 40 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:40
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 134 Artikel zu Themengebieten der Seismologie, Erdmagnetismus und Gesteinsphysik veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1974.
    Description: Inhaltsverzeichnis: Journal of Geophysics 40 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0010.pdf"〉Seegravimetrie〈/a〉〈br〉 (Fleischer, U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0014.pdf"〉Statistical analysis of the pitch angle distribution of magnetospheric solar protons during geomagnetic activity〈/a〉〈br〉 (Scholer, M., Morfill, G., Hovestadt, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0016.pdf"〉Viscosity-depth-structure of different tectonic units and possible consequences for the upper part of converging plates〈/a〉〈br〉 (Meissner, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0017.pdf"〉Die Magnetisierung von Bohrkernen aus einem Serpentinit-Vorkommen bei Erbendorf (Oberpfalz) (Schult, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0018.pdf"〉Estimates of in situ thermal diffusivity of the Ore-Bearing Rocks in some drillholes in the Skellefte Field (N. Sweden) using the annual temperature wave〈/a〉〈br〉 (Parasnis, D. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0019.pdf"〉Geophysical exploration for groundwater in the Lusaka District, Republic of Zambia〈/a〉〈br〉 (Töpfer, K.D., Legg, C. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0021.pdf"〉Neuere Versuche zum Dipol-Induktionsverfahren〈/a〉〈br〉 (Leppin, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0022.pdf"〉A field evaluation of Caner's broad-band geomagnetic induction instrumentation〈/a〉〈br〉 (Dragert, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0025.pdf"〉Seismic noise at 2 Hz in Europe〈/a〉〈br〉 (Plešinger, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0026.pdf"〉Crustal structure under the Ionian Sea〈/a〉〈br〉 (Weigel, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0028.pdf"〉Heat-Flow Measurements in Swiss Lakes〈/a〉〈br〉 (Von Herzen, R. P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0029.pdf"〉Makroseismische Abschätzungen von Herdparametern österreichischer Erdbeben aus den Jahren 1905 - 1973〈/a〉〈br〉 (Franke, A., Gutdeutsch, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0030.pdf"〉Long range propagation of seismic energy in the lower lithosphere〈/a〉〈br〉 (Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0033.pdf"〉Palaeomagnetism of tertiary volcanic rocks from the Ethiopian southern plateau and the Danakil Block〈/a〉〈br〉 (Schult, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0034.pdf"〉Calculation of the shape and position of the last closed field line boundary and the coordinates of the magnetopause neutral points in a theoretical magnetospheric field model〈/a〉〈br〉 (Voigt, G.-H.))〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0037.pdf"〉Doppler shift of auroral backscatter signals〈/a〉〈br〉 (Czechowsky, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0038.pdf"〉Spherical harmonic analysis of the DS-field during magnetic storms〈/a〉〈br〉 (Schreiber, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0041.pdf"〉Note on determining hourly mean values〈/a〉〈br〉 (Larsen, J. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0042.pdf"〉Seismic observations in Germany of a 10 t explosion off Scotland〈/a〉〈br〉 (Bonjer, K.-P., Kaminski, W., Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0044.pdf"〉A method to reduce the measuring time for spinner magnetometers〈/a〉〈br〉 (Hummervoll, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0045.pdf"〉Book Reviews〈/a〉〈br〉 (Mayer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0046.pdf"〉Transverse plasma waves in the solar wind close to the proton gyrofrequency〈/a〉〈br〉 (Rehn, H. W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0047.pdf"〉Die magnetische Anomalie der Ivreazone〈/a〉〈br〉 (Albert, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0052.pdf"〉Second meeting of the European Geophysical Society〈/a〉〈br〉〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0053.pdf"〉On a high-frequency method for the measurement of susceptibilities and hysteresis losses of rocks and minerals between nitrogen temperature and 700 °C〈/a〉〈br〉 (Markert, H., Trissl, K.-H., Zimmermann, G. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0054.pdf"〉Kinetics of oxidation processes in titanomagnetites〈/a〉〈br〉 (Kropáček, V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0056.pdf"〉Ultra sound absorption measurements in rock samples at low temperatures〈/a〉〈br〉 (Herminghaus, Ch., Berckhemer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0058.pdf"〉Recordings with the Askania borehole tiltmeter (vertical pendulum) in the frequency range of earth's free oscillations〈/a〉〈br〉 (Flach, D., Große-Brauckmann, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0060.pdf"〉Heat flow measurements in northern Italy and heat flow maps of Europe〈/a〉〈br〉 (Haenel, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0062.pdf"〉Die Bestimmung der Transmissivität von Grundwasserleitern aus dem Einschwingverhalten des Brunnen-Grundwasserleitersystems〈/a〉〈br〉 (Krauss, I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0063.pdf"〉Symposium on "Geomagnetic Anomalies, Rock Magnetism and Petrography"〈/a〉〈br〉 (Hahn, A., Hall, D. H., Dunlop, D. J., Kobayashi, Kazuo, Nomura, Masafumi, Lidiak, E. G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0090.pdf"〉The AEROS mission〈/a〉〈br〉 (Lämmerzahl, P., Bauer, S. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0091.pdf"〉The AEROS-EUV Spectrometer〈/a〉〈br〉 (Schmidtke, G., Schweizer, W., Knothe, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0092.pdf"〉The retarding potential analyzer on AEROS-B〈/a〉〈br〉 (Spenner, K., Dumbs, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0094.pdf"〉Impedance probe. The AEROS-B electron density experiment〈/a〉〈br〉 (Neske, E., Kist, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0095.pdf"〉The AEROS neutral and ion mass-spectrometer〈/a〉〈br〉 (Krankowsky, D., Lämmerzahl, P., Bonner, F., Wieder, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0096.pdf"〉The neural atmosphere temperature experiment〈/a〉〈br〉 (Spencer, N. W., Pelz, D. T., Niemann, H. B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0097.pdf"〉Atmospheric drag analysis with the AEROS Satellite〈/a〉〈br〉 (Roemer, Max, Wulf-Mathies, Carsten)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0098.pdf"〉Electromagnetic reflections in salt deposits〈/a〉〈br〉 (Thierbach, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0100.pdf"〉The structure of the Ries crater from geoelectric depth soundings〈/a〉〈br〉 (Ernstson, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0102.pdf"〉Measurements of magnetic total field anomalies in the Hon Graben, Libya〈/a〉〈br〉 (Schult, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0103.pdf"〉Correction〈/a〉〈br〉〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0104.pdf"〉Book reviews〈/a〉〈br〉 (Theile, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0105.pdf"〉Interplanetary magnetic fields and the propagation of cosmic rays〈/a〉〈br〉 (Wibberenz, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0106.pdf"〉Intensity and energy spectrum of electrons accelerated in the earth's bow shock〈/a〉〈br〉 (Anderson, K. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0107.pdf"〉Evidence from particle precipitation of two-way-convection in auroral latitudes〈/a〉〈br〉 (Hultqvist, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0110.pdf"〉Investigation of electron dynamics in the magnetosphere with electron beams injected from sounding rockets〈/a〉〈br〉 (Winckler, J. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0113.pdf"〉Cosmic ray electrons in the atmosphere〈/a〉〈br〉 (Fulks, G., Meyer, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0114.pdf"〉Cosmic rays underground and the interplanetary magnetic field〈/a〉〈br〉 (Regener, Victor H., Regener, Eric)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0115.pdf"〉Harmonic temperature waves in a horizontally layered medium〈/a〉〈br〉 (Mundry, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0118.pdf"〉No transform faults on the moon〈/a〉〈br〉 (Stegena, L., Bérczi, Sz.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0121.pdf"〉Dominating trends of the anomalies of the gravity and magnetic fields in NE France and SW Germany〈/a〉〈br〉 (Edel, J. B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0040/LOG_0122.pdf"〉Book Reviews〈/a〉〈br〉 (Strobach, K., Petersen, Nikolai)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DGG, DFG, SUB Göttingen
    Keywords: 550 ; Aeronomy ; AEROS (satellite) ; Africa ; Alps ; Applied Geophysics ; Aurora ; Austria ; Bow Shock of Earth ; Canada ; Cosmic Rays ; Crustal Structure ; Earthquakes ; Europe ; France ; Free Oscillation of Earth ; Geoelectrics ; Geomagnetic Anomalies ; Geomagnetic Deep Sounding ; Geomagnetic Secular Variation ; Geomagnetic Time Variations ; Gravity Anomalies ; Gravity ; Geothermics ; Germany ; Great Britain ; Heat Flow ; Hydrology ; Interplanetary Magnetic Field ; Ionian Sea ; Ionosphere ; Italy ; Lunar Seismology ; Lunar Tectonism ; Macquarie-Inseln ; Magnetosphere ; Mantle of Earth ; Marine Geophysics ; Pacific Ocean ; Paleomagnetism ; Particle Acceleration ; Plasma Waves ; Radio Waves ; Ries Crater ; Rock Magnetism ; Rock Physics ; Salt Deposits ; Seismic Deep Sounding ; Seismic Noise ; Seismic Refraction Measurements ; Seismic Wave Absorption ; Seismology ; Solar EUV Radiation ; Solar Wind ; Switzerland ; Tectonophysics ; Tiltmeter ; United States ; USSR ; Viscosity of Earth ; FID-GEO-DE-7
    Language: German , English
    Type: anthology_digi
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    Journal of Geophysics - Zeitschrift für Geophysik 51 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:51
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 29 Artikel zu Themengebieten der Geophysik, insbesondere zu Aspekten des Erdmagnetismus und der Seismik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1982.
    Description: Inhaltsverzeichnis: Journal of Geophysics 51 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0011.pdf"〉〈sup〉40〈/sup)Ar–〈sup〉39〈/sup〉Ar Ages of Rocks and Glasses from the Nördlinger Ries Crater and the Temperature History of Impact Breccias〈/a〉〈br〉 (Staudacher, T., Jessberger, E. K., Dominik, B., Kirsten, T., Schaeffer, O. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0012.pdf"〉Tectonic Inferences of Paleomagnetic Data from Some Mesozoic Formations in Central Iran〈/a〉〈br〉 (Wensink, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0013.pdf"〉Palaeomagnetic Results from Lower Paleozoic Diabases and Pillow Lavas from the Frankenwald Area (Northwestern Edge of the Bohemian Massif) 〈/a〉〈br〉 (Kim, In-Soo, Soffel, H. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0014.pdf"〉Palaeomagnetism of Quaternary Volcanics of the East-Eifel, Germany〈/a〉〈br〉 (Böhnel, H., Kohnen, H., Negendank, J., Schmincke, H.-U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0016.pdf"〉The Effect of Young Oceanic Regions on Frequencies and Damping of free Oscillations of the Earth〈/a〉〈br〉 (Roult, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0017.pdf"〉Altitude Characteristics of Radar Aurora as Seen by a 90-MHz Double-Altitude Radar System Operated at Karmaselga, Karelia〈/a〉〈br〉 (Timofeev, E., Miroshnikov, Y.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0018.pdf"〉Observations of Ionospheric and Field-Aligned Currents in the Late Afternoon Sector with Triad and the Scandinavian Magnetometer Array〈/a〉〈br〉 (Sulzbacher, H., Baumjohann, W., Potemra, T. A., Nielsen, E., Gustafsson, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0019.pdf"〉Adiabatic Invariant of the Non-Relativistic Particles in the Field of a Shock Wave〈/a〉〈br〉 (Chirkov, A. G., Khodjaev, S. D., Shatalov, S. D., Vasiliyev, V. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0020.pdf"〉Comparative Interpretation of Explosion Seismic Data〈/a〉〈br〉 (Ansorge, J., Prodehl, C., Bamford, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0022.pdf"〉The Intercept-Time Method – Possibilities and Limitations〈/a〉〈br〉 (Pavlenkova, N. I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0025.pdf"〉Linearized Solutions of Kinematic Problems of Seismic Body Waves in Inhomogeneous Slightly Anisotropic Media〈/a〉〈br〉 (Červený, V., Jech, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0026.pdf"〉Source Parameters of Mine Tremors in the Eastern Part of the Ruhr-District (West-Germany) 〈/a〉〈br〉 (Hinzen, K.-G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0027.pdf"〉Ferromagnetic Resonance 〈I〉g〈/i〉-Factor Measurement on LUNA 20 Soil〈/a〉〈br〉 (Frait, Z., Cimbálníková, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0028.pdf"〉Observation of Guided ULF-Waves Correlated with Auroral Particle Precipitation Theoretically Explained by Negative Landau Damping〈/a〉〈br〉 (Klöcker, N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0029.pdf"〉Ground – Satellite Correlative Study of a Giant Pulsation Event〈/a〉〈br〉 (Hillebrand, O., Münch, J., McPherron, R. L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0030.pdf"〉Average Diurnal Variations of the Intensity of Geomagnetic Pulsations in the Period Ranges of pc 2–pc 5 Observed at Fürstenfeldbruck During the Years 1960–1971〈/a〉〈br〉 (Korschunow, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0031.pdf"〉Dispersion Effect in Earth Tide Parameters? 〈/a〉〈br〉 (Wilhelm, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0032.pdf"〉Comments on “Palaeomagnetism of Upper Cretaceous Volcanics and Nubian Sandstones of Wadi Natash, SE Egypt and Implications for the Polar Wander Path for Africa in the Mesozoic”〈/a〉〈br〉 (Schult, A., Hussain, A. G., Soffel, H. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0033.pdf"〉Book Reviews〈/a〉〈br〉 (Buntebarth, G., Stegena, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0034.pdf"〉Amplitude study of the 〈i〉Pg〈/i〉 Phase〈/a〉〈br〉 (Banda, E., Deichmann, N., Braile, L. W., Ansorge, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0035.pdf"〉Analysis of Broad-Band Rayleigh Waves: A Possibility for Seismic Discrimination〈/a〉〈br〉 (Hanka, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0038.pdf"〉Shear Fracture Development and Seismic Regime in Pyrophyllite Specimens with Soft Inclusions〈/a〉〈br〉 (Sobolev, G., Rummel, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0039.pdf"〉The Shape of the Geomagnetic Field Through the Last 8,500 Years Over Part of the Northern Hemisphere〈/a〉〈br〉 (Creer, K. M., Tucholka, P.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0040.pdf"〉The Induced Effects of Geomagnetic Variations in the Equatorial Region〈/a〉〈br〉 (Carlo, L., Singh, B. P., Rastogi, R. G., Agrarwal, A. K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0041.pdf"〉Parameter Trade-Off in One-Dimensional Magnetotelluric Modelling〈/a〉〈br〉 (Fischer, G., Le Quang, B. V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0042.pdf"〉A Theory of Forced Magnetohydrodynamic Waves〈/a〉〈br〉 (Krummheuer, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0043.pdf"〉Pi2 Magnetic Pulsations, Auroral Break-ups, and the Substorm Current Wedge: A Case Study〈/a〉〈br〉 (Pashin, A. B., Glaßmeier, K. H., Baumjohann, W., Raspopov, O. M., Yahnin, A. G., Opgenoorth, H. J., Pellinen, R. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0045.pdf"〉In Memoriam Haakon Brækken 14 April 1902 – 2 Juli 1982〈/a〉〈br〉 (Saxov, S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0051/LOG_0046.pdf"〉Book Reviews〈/a〉〈br〉 (Jacoby, W. R., Jentzsch, G., Spohn, T., Engelhard, L., Christensen, U.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aurora ; Geomagnetic Pulsations ; Paleomagnetism ; Paläomagnetismus ; Satellites ; Seismologie ; Seismology ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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    CITATION GEO-LEO
  • 13
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    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 52 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:52
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 33 Artikel zu Themengebieten der Geophysik, inklusive der Beiträge zu einem Symposium über "Plasma und Teilchen in der Magnetosphäre", veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1983.
    Description: Inhaltsverzeichnis: Journal of Geophysics 52 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0011.pdf"〉On Systematic Errors in Phase-Velocity Analysis〈/a〉〈br〉 (Wielandt, E., Schenk, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0012.pdf"〉The Upper Mantle Structure Under South-East Europe Derived from GRF Broadband Records of Greek Earthquakes〈/a〉〈br〉 (Rademacher, H, Odom, R. I., Kind, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0013.pdf"〉Seismic Velocities of Granulites from the Seiland Petrographic Province, N. Norway: Implications for Scandinavian Lower Continental Crust〈/a〉〈br〉 (Chroston, P. N., Evans, C. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0014.pdf"〉Inductive Coupling Between Idealized Conductors and Its Significance for the Geomagnetic Coast Effect〈/a〉〈br〉 (Wolf, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0015.pdf"〉VHF Radar Observations of Wind Velocities at the Arecibo Observatory〈/a〉〈br〉 (Röttger, J., Czechowsky, P., Rüster, R., Schmidt, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0016.pdf"〉Spatial Variations of Ionospheric Conductivity and Radar Auroral Amplitude in the Eastward Electrojet Region During Pre-Substorm Conditions〈/a〉〈br〉 (Uspensky, M. V., Pellinen, R. J., Baumjohann, W., Starkov, G. V., Nielsen, E., Sofko, G., Kaila, K. U.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0019.pdf"〉On the Dependence of Radar Aurora Amplitude on Ionospheric Electron Density〈/a〉〈br〉 (Starkov, G. V., Oksman, J., Uspensky, M. V., Kustov, A. V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0020.pdf"〉A Possibility to Distinguish Between Ionospheric and Magnetospheric Origin of Low Latitude Magnetic Perturbations〈/a〉〈br〉 (Papamastorakis, I., Haerendel, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0021.pdf"〉An Analogue Model of the Geomagnetic Induction in the South Indian Ocean〈/a〉〈br〉 (Papamastorakis, I., Haerendel, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0022.pdf"〉Book Review〈/a〉〈br〉 (Klever, N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0023.pdf"〉Investigations of the Internal Geomagnetic Field by Means of a Global Model of the Earth's Crust〈/a〉〈br〉 (Meyer, J., Hufen, J.-H., Sichert, M., Hahn, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0025.pdf"〉A Palaeointensity Method for Use with Highly Oxidised Basalts, and Application to Some Permian Volcanics〈/a〉〈br〉 (Senanayake, W. E., McElhinny, M. W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0027.pdf"〉Comparison of Errors in Local and Reference Estimates of the Magnetotelluric Impedance Tensor〈/a〉〈br〉 (Kröger, P., Micheel, H. J., Elsner, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0028.pdf"〉Discrete Chorus Emissions Recorded at Nainital〈/a〉〈br〉 (Khosa, P. N., Lalmani, Ahmad, M. M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0029.pdf"〉Evidence for Lamination in the Lower Continental Crust Beneath the Black Forest〈/a〉〈br〉 (Southwestern Germany) (Deichmann, N., Ansorge, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0030.pdf"〉FENNOLORA Recordings at NORSAR〈/a〉〈br〉 (Mereu, R. F., Mykkeltveit, S., Husebye, E. S.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0032.pdf"〉Earth's Flattening Effect on the Tidal Forcing Field〈/a〉〈br〉 (Wilhelm, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0033.pdf"〉Some Results of Calibration Factor Determination of LaCoste and Romberg Gravity Meters (Model D) 〈/a〉〈br〉 (Götze, H.-J., Meurers, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0034.pdf"〉Ocean Tides and Periodic Variations of the Earth's Rotation〈/a〉〈br〉 (Baader, H.-R., Brosche, P., Hövel, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0035.pdf"〉In Memoriam Anton Graf (1901–1981) 〈/a〉〈br〉 (Rosenbach, O., Gauthier, W.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0036.pdf"〉In Memoriam Jürgen Henning Illies March 14, 1924 – August 2, 1982〈/a〉〈br〉 (Fuchs, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0037.pdf"〉Book Reviews〈/a〉〈br〉 (Spohn, T., Jacoby, W. R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0038.pdf"〉Preface to the special issue “Plasma and Energetic Particles in the Magnetosphere”, EGS Meeting, 23-27 Auguts 1982, Leeds, UK〈/a〉〈br〉 (Hovestadt, D., Untiedt, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0039.pdf"〉Global Pattern of Auroral Ion Precipitation: A Review of the Results from the AUREOLE-1 and AUREOLE-2 Satellites〈/a〉〈br〉 (Crasnier, J., Sauvaud, J. A., Cambou, F., Gladyshev, V. A., Kovrazhkin, R. A., Galperin, Yu. I.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0040.pdf"〉A Technique for Studying Density Gradients and Motions of Plasmaspheric Irregularities〈/a〉〈br〉 (Jones, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0041.pdf"〉Heavy Ion Plasmas in the Outer Magnetosphere〈/a〉〈br〉 (Young, D. T.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0042.pdf"〉Energetic Particle Signatures Near Magnetospheric Boundaries〈/a〉〈br〉 (Scholer, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0043.pdf"〉Recent ISEE Observations of the Magnetopause and Low Latitude Boundary Layer: A Review〈/a〉〈br〉 (Saunders, M. A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0044.pdf"〉Motion of Flux Transfer Events on 10 November 1977 Determined by Energetic Particles on ISEE 2〈/a〉〈br〉 (Daly, P. W., Keppler, E.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0045.pdf"〉On the Dynamics of the Ring Current〈/a〉〈br〉 (Hultqvist, B.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0046.pdf"〉Ionic Composition of the Earth's Radiation Belts〈/a〉〈br〉 (Spjeldvik, W. N.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0047.pdf"〉Energy and Charge Distribution of Energetic Helium Ions in the Outer Radiation Belt of the Earth〈/a〉〈br〉 (Klecker, B., Hovestadt, D., Scholer, M., Gloeckler, G., Ipavich, F. M., Fan, C. Y.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0052/LOG_0049.pdf"〉High Energy Electrons at Altitudes 500 km Near the Equator〈/a〉〈br〉 (Just, L., Kudela, K., Gusev, A. A., Pugacheva, G. I.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aurora ; Black Forest ; Earth's Crust ; Geomagnetism ; India ; Magnetosphere ; Seismics ; Seismology ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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    CITATION GEO-LEO
  • 14
    facet.materialart.
    Unknown
    Journal of Geophysics - Zeitschrift für Geophysik 56 (2019)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148:56
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 26 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1985.
    Description: Inhaltsverzeichnis: Journal of Geophysics 56 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0010.pdf"〉Archaeomagnetic Study of Medieval Fireplaces at Mannheim-Wallstadt and Ovens from Herrenchiemsee (Southern Germany) and the Problem of Magnetic Refraction〈/a〉〈br〉 (Schurr, K., Becker, H., Soffel, H.C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0012.pdf"〉Frequency Dependence of 〈i〉Q〈/i〉 for Seismic Body Waves in the Earth's Mantle〈/a〉〈br〉 (Ulug, A., Berckhemer, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0013.pdf"〉The Polarization of S Waves in a Heterogeneous Isotropic Earth Model〈/a〉〈br〉 (Cormier, V. F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0014.pdf"〉The Relaxation of Spherical and Flat Maxwell Earth Models and Effects Due to the Presence of the Lithosphere〈/a〉〈br〉 (Wolf, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0015.pdf"〉Plasma-Gas Interactions in Planetary Atmospheres and Their Relevance for the Terrestrial Hydrogen Budget〈/a〉〈br〉 (Nass, H. U., Fahr, H. J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0016.pdf"〉Increased Ionospheric Absorption Connected With Pc 1 Pulsations after Geomagnetic Storms〈/a〉〈br〉 (Märcz, F.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0017.pdf"〉Some Aspects of Whistler Duct Lifetimes at Low Latitudes〈/a〉〈br〉 (Lalmani)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0018.pdf"〉On a Mixed Quadratic Invariant of the Magnetic Susceptibility Tensor〈/a〉〈br〉 (Jelinek, V.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0019.pdf"〉In Memoriam Hans Closs (1907 – 1982) 〈/a〉〈br〉 (Dürbaum, H.-J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0020.pdf"〉In Memoriam Herbert Flathe (1919 – 1983) 〈/a〉〈br〉 (Homilius, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0021.pdf"〉Book Reviews〈/a〉〈br〉 (Böhmel, H., Doan, D., Strobach, K., Jentzsch, G.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0022.pdf"〉Crustal Structure Beneath the Swabian Jura, SW Germany, from Seismic Refraction Investigations〈/a〉〈br〉 (Gajewski, D., Prodehl, C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0024.pdf"〉Static Deformations and Gravity Changes at the Earth's Surface Due to Atmospheric Loading〈/a〉〈br〉 (Rabbel, W., Zschau, J.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0026.pdf"〉The Normal Modes of a Uniform, Compressible Maxwell Half-Space〈/a〉〈br〉 (Wolf, D.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0027.pdf"〉Magnetic Expression of the Continent-Ocean Boundary Between the Western Margin of Australia and the Eastern Indian Ocean〈/a〉〈br〉 (Veevers, J. J., Tayton, J. W., Johnson, B. D., Hansen, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0031.pdf"〉Domain State of Ti-Rich Titanomagnetites Deduced from Domain Structure Observations and Susceptibility Measurements〈/a〉〈br〉 (Appel, E., Soffel, H. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0032.pdf"〉Large-Scale Studies of Pi-2's Associated with Auroral Breakups〈/a〉〈br〉 (Samson, J. C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0033.pdf"〉Book Reviews〈/a〉〈br〉 (Schröder,W., Engelhard, L.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0034.pdf"〉Source Orientation from Grid Test and Synthetic Seismograms and an Application to the Ibbenbüren Earthquake of July 1981〈/a〉〈br〉 (Hinzen, K.-G., Krummel, H.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0035.pdf"〉Active Seismic Layers and Crustal Structure in Some Italian Regions〈/a〉〈br〉 (Cassinis, R., Mazzoni, P., Ranzoni, A.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0037.pdf"〉Nonlinear Inversion of Local Seismic Travel Times for the Simultaneous Determination of the 3D-Velocity Structure and Hypocentres – Application to the Seismic Zone Vrancea〈/a〉〈br〉 (Koch, M.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0038.pdf"〉The Relationship Between the Magnetic Anisotropy and the 〈i〉c〈/i〉-Axis Fabric in a Massive Hematite Ore〈/a〉〈br〉 (Hrouda, F., Siemes, H., Herres, N., Hennig-Michaeli, C.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0040.pdf"〉The Inverse Scattering Problem for Reflection of Electromagnetic Dipole Radiation From Earth With Vertical Variation〈/a〉〈br〉 (Vidberg, H. J., Riska, D. O.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0041.pdf"〉The Method of Integral Equation in the Direct Current Resistivity Method and its Accuracy〈/a〉〈br〉 (Schulz, R.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0042.pdf"〉Stochastic Ion Acceleration by Coherent Electrostatic Waves〈/a〉〈br〉 (Varvoglis, H., Papadopoulos, K.)〈/a〉〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0056/LOG_0043.pdf"〉Book Reviews〈/a〉〈br〉 (Dieminger, W., Brüstle, W.)〈/a〉〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Aurora ; Earthquakes ; Earth's Crust ; Earth's Mantle ; Geomagnetic Pulsations ; Rock Magnetism ; Seismology ; Seismograms ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 15
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    Experimental Investigation of a One-Sided Ejector Nozzle (2019)
    In:  CASI
    Details
    Publication Date: 2019-05-07
    Description: A fundamental exploratory experiment is conducted assessing the performance of a one-sided ejector with the eventual goal of noise reduction for jet engines. The hardware is comprised of an 8:1 rectangular nozzle together with an ejector box whose lower surface is flush with the lower lip of the nozzle. Secondary flow is allowed through a gap between the upper lip of the nozzle and a flap that constitutes the upper surface of the ejector. Wall static pressures and Pitot probe surveys are conducted to evaluate the performance of the ejector with variation of geometric parameters. It is found that addition of vortex generating tabs at the upper lip of the nozzle significantly increases secondary flow entrainment. The entrainment is further enhanced by a divergence of the ejector upper surface. Limited noise measurements are done. The baseline ejector (without tabs) often encounters flow resonance with accompanying tones. The tabs have the additional benefit of eliminating those tones in all cases. However, for the tabbed case, addition of the ejector produces insignificant further noise reduction. This is due to the fact that the flow remains unmixed on the lower half of the ejector. The focus of ongoing and future efforts is to achieve sufficient mixing of the flow so that the exhaust velocities are uniformly low, while keeping the ejector hardware short and lightweight.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220064 , GRC-E-DAA-TN65186 , E-19654
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  • 16
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    Computation Simulations of Electric Propulsion Aircraft: The X-57 Maxwell (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-03
    Description: Outline - Introduction: X-57 CFD task overview; Motivation. Part I, Computational simulations without propulsion: Establishing CFD (Computational Fluid Dynamics) Best Practices - Grid generation - Mesh refinement study - Numerical methods - Wind tunnel validation study; Power-Off Aerodynamic Database Results. Part II, Computational simulations with propulsion: Cruise Power-On Database; High-Lift Power-On Database. Summary.
    Keywords: Aircraft Propulsion and Power
    Type: ARC-E-DAA-TN69863 , NASA Advanced Supercomputing Advanced Modeling & Simulation (AMS) Seminar Series; Jun 13, 2019; Moffett Field, CA; United States
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  • 17
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    Geared Turbofan Engine Having a Reduced Number of Fan Blades and Improved Acoustics (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A rotor blade comprises an airfoil extending radially from a root section to a tip section and axially from a leading edge to a trailing edge, the leading and trailing edges defining a curvature therebetween. The curvature determines a relative exit angle at a relative span height between the root section and the tip section, based on an incident flow velocity at the leading edge of the airfoil and a rotational velocity at the relative span height. In operation of the rotor blade, the relative exit angle determines a substantially flat exit pressure ratio profile for relative span heights from 75% to 95%, wherein the exit pressure ratio profile is constant within a tolerance of 10% of a maximum value of the exit pressure ratio profile.
    Keywords: Aircraft Propulsion and Power
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  • 18
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    Development of a Broadband Acoustic Emulator to Mature Propulsion Noise Reduction (CFANS-BB) (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A simulator to artificially generate turbofan broadband signatures using the ANCF (Advanced Noise Control Fan) test article is presented. [Development of a Broadband Acoustic Emulator to Mature Propulsion Noise Reduction (CFANS-BB: Configurable Fan Artificial Noise Source- Broadband)]
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN67362 , Acoustics Technical Working Group (ATWG) Spring 2019 Meeting; Apr 10, 2019 - Apr 12, 2019; Hampton, VA; United States
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  • 19
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    Numerical Investigation of a Shielded Chevron Nozzle (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Reynolds-Averaged Navier-Stokes simulations have been performed on a three-stream inverted velocity profile nozzle with and without various configurations of chevrons attached. The nozzle was mounted on a planform to imitate an engine mounted above a wing, shielding ground observers from engine noise. Several chevron designs intended to aggressively mix the jet and move noise sources upstream for shielding were examined to investigate there effects on noise and thrust. Numerical results for the baseline nozzle and one chevron configuration were compared with far-field noise and particle image velocimetry data obtained in NASA Glenn Research Center's Aero-Acoustic Propulsion Laboratory. A configuration in which chevrons alternate penetration into the primary stream and tertiary fan stream was explored using the Modern Design of Experiments approach. Short, high-penetration chevrons demonstrated a significant noise reduction for a relatively small thrust penalty.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/CR-2019-220066 , E-19656
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  • 20
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    Multipoint Design and Optimization of a Turboshaft Engine for a Tiltwing Turboelectric Vertical Takeoff Landing Air Taxi (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: This paper describes the design of a turboshaft engine for a tiltwing air taxi application. In this case, the tiltwing air taxi is intended to fly a 400 nm mission with up to fifteen passengers. Engine requirements for the concept engine are taken from aircraft system studies where thrust is produced by four propellers driven by electric motors and powered by a single gas turbine engine. The purpose of this paper is to perform a cycle design optimization that minimizes fuel consumption and weight while respecting current technology limitations to meet mission requirements. To achieve results, the engine overall pressure ratio and maximum temperature at the exit of the combustor are set as the design parameters. Several sensitivity studies are also performed to visualize optimization trends. Results of the optimization study show solutions are heavily dependent on engine cooling flow requirements and exact mission requirements. This engine is intended for use in large system optimization research.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220151 , AIAA Paper 2019-1948 , E-19671 , GRC-E-DAA-TN65425 , AIAA SciTech Forum 2019; Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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  • 21
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    Computational Modeling for Non-Equilibrium Shock Tube Flows (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-25
    Description: Time accurate simulation of non-equilibrium flows inside shock tube facilities presents several challenges from both physical and mathematical aspects. Furthermore, the large computational cost makes it impractical to support a real-time experimental test campaign. In this work, we explore other methods for modeling the shock tube problem with the main focus on the post-shock region and the absolute radiation emanating from it. The proposed alternative approach is several orders of magnitude less computationally expensive while still accurate enough with regards to the quantities of interest. Excellent agreement is found with the established stagnation-line approach. Comparison with time-accurate simulations shows good agreement close to the peak values and disagreement of the temperatures relaxation and radiance profiles toward equilibrium.
    Keywords: Aircraft Propulsion and Power
    Type: ARC-E-DAA-TN70861 , International Symposium on Shock Waves (ISSW32); Jul 14, 2019 - Jul 19, 2019; Singapore; China
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    Lessons Learned in Fabrication of a High-Specific-Torque Concentric Magnetic Gear (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Magnetic gearing is being investigated at NASA as a replacement to conventional mechanical gearing in aerospace applications. Some potential benefits of magnetic gears over mechanical gearing are torque transmission without mechanical contact, decreased transmission noise, and no required lubrication. However, in order to be a viable alternative for aerospace applications, magnetic gearing must be shown to provide high enough specific torque (torque per unit mass). NASA's second magnetic gearing prototype (PT-2) was able to achieve promising specific torque on par with low torque mechanical gearboxes. This work will briefly review the electromagnetic and structural design of PT-2, provide detailed information on fabrication and assembly, examine build errors, walk through rebuild efforts to improve operation, and conclude with remarks on build difficulties and opportunities for improvement in future prototypes.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN68518 , Annual Vertical Flight Society (VFS 2019) Forum and Technology Display (Forum 75); May 13, 2019 - May 16, 2019; Philadelphia, PA; United States
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  • 23
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    NASA Acoustic Stirling IRAD Thermal Recovery Energy Efficient System (TREES) Energy Conversion and Management in Aircraft (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA Acoustic Stirling IRAD (Internal Research and Development) Thermal Recovery Energy Efficient System (TREES) Energy Conversion and Management in Aircraft. Presentation on energy conversion on aircraft. Thermal energy recovery changes aircraft thermal management from being a necessary burden on aircraft performance to a desirable asset. It improves the engine performance by recycling waste heat and ultimately rejecting all collected aircraft heat out through the engine nozzle.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN68025 , Interagency Advanced Power Group (IAPG 2019) Mechanical Working Group (MWG) Meeting; May 14, 2019 - May 16, 2019; Houston, TX; United States
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  • 24
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    Modeling Turboshaft Engines for the Revolutionary Vertical Lift Technology Project (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Turboshaft engine performance and weight models were developed to support conceptual propulsion and vehicle mission design in support of the National Aeronautics and Space Administration's (NASA) Aeronautics Mission Research Directorate's (ARMD) Revolutionary Vertical Lift Technology (RVLT) Project. These models were developed using open data sources, assuming current and advanced technology levels, and range from 650 to 7,500 shaft output horsepower (485 to 5,600 kilowatts). Documenting the methodology, assumptions, and resulting performance realizes important benefits for NASA and the aviation community. NASA concept vehicle efforts using these propulsion models can more readily shared among the government, industry and university community as common baselines to support current and future work. Assessing the benefits of advanced technologies and new configurations can be facilitated using these models, which helps guide technology investment. As the various modeling conceptual vehicle and mission analysis environments advance, these models can be used directly for broader systems analysis studies, including optimization within the propulsion model itself. To perform this effort, the turboshaft engine is briefly discussed, highlighting the specific components and their expected performance characteristics over the power range and technology levels considered. Engine configurations will also be discussed as they will vary based on power output and assumed technology level. Engine performance, such as airflow, power output and weight will be reported, noting trends that are important for system studies. The effect of advanced propulsion technologies on RVLT-concept vehicles are also reported. Finally, potential future propulsion modeling work will be proposed.
    Keywords: Aircraft Propulsion and Power
    Type: VFS-Forum75-Paper-231 , GRC-E-DAA-TN68629 , Annual Vertical Flight Society (VFS 2019) Forum and Technology Display (Forum 75); May 13, 2019 - May 16, 2019; Philadelphia, PA; United States
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  • 25
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    PIV/Phased Array/Far-Field Noise Measurements of a Low-Noise Top-Mounted Propulsion Installation for a Supersonic Airliner (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A model-scale exhaust system was tested to validate low-noise concepts and noise prediction methods. The tests involved far-field acoustics, translating phased array, and particle image velocimetry; this report covers the far-field acoustic measurements. Data were acquired for a series of nozzles with different chevron designs, both uninstalled and installed on a representative aircraft planform. The impact of the various chevron treatments on the far-field noise was documented, along with the impact of the pylon and planform. For the baseline nozzle, installation produced a 2 EPNdB (Effective Perceived Noise in deciBels) reduction, as assumed in system studies. Chevrons were used to shift noise sources upstream to maximize the installation benefits and to reduce unshielded sources downstream. These resulted in reductions of 4-5 EPNdB...
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN67394 , Acoustics Technical Working Group (ATWG) Spring 2019 Meeting; Apr 10, 2019 - Apr 12, 2019; Hampton, VA; United States
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  • 26
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    Modeling Turboshaft Engines for the Revolutionary Vertical Lift Technology Project (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Turboshaft engine performance and weight models were developed to support conceptual propulsion and vehicle mission design and performance under the Revolutionary Vertical Lift Technology (RVLT) Project. These models were developed using open data sources, assuming current and advanced technology levels, and range from 650 to 7,500 shaft output horsepower (485 to 5,600 kW). Documenting the methodology, assumptions, and resulting performance realizes important benefits NASA and the aviation community. NASA concept vehicle efforts using these propulsion models can be more readily shared among the government, industry and university community as common baselines to support current and future work. Assessing the benefits of advanced technologies and new configurations can be facilitated using these models, which helps guide technology investment. As the various modeling conceptual vehicle and mission analysis environments advanced, these models can be used directly for broader systems analysis studies, including optimization within the propulsion model itself. To perform this effort, the turboshaft engine is briefly discussed, highlighting the specific components and their expected performance characteristics over the power range and technology levels considered. Engine configurations will also be discussed as they will vary based on power output and assumed technology level. Engine performance, such as airflow, power output and weight will be reported, noting trends that are important for system studies. The effect of advanced propulsion technologies on RVLT concept vehicles are also reported. Finally, potential future propulsion modeling work will be proposed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN66991 , Annual Forum and Technology Display: The Future of Vertical Flight; May 13, 2019 - May 16, 2019; Philadelphia, PA; United States
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    New Test Rig to Measure Alternating Current Losses of Both Low and High Critical Temperature Superconductors (2019)
    In:  CASI
    Details
    Publication Date: 2019-06-18
    Description: This paper presents the design, development, operation, and test capabilities of a proposed superconducting coil testbed to measure alternating current (AC) losses at the NASA Glenn Research Center. Superconducting AC losses are important in the design of electric stators and rotors, power transmission lines, transformers, fault current limiters, magnets, and superconducting energy storage (not batteries). The new liquid-hydrogen-based rig will allow superconducting testing across a wide range of test parameters, including injected current up to 400 A, frequency (0 to 400 Hz), magnetic field (0 to 0.6 T), phase angle between induced voltage and injected current (180 to 180), coil coolant temperature (18 to 28 K), and AC power loss (5 to 30 W). While the target application of interest is 20 K superconducting MgB2 (the only superconductor that can presently be made with low losses) stator coils for future electric machines, the rig can accommodate test articles (TAs) with straight wire, tape, cables, coils of any shape, any allowable combination of superconducting wire and fluid (e.g., yttrium barium copper oxide (YBCO) coils and liquid nitrogen), and AC or direct current (DC) testing. The new spin rig builds upon the existing Air Force spin rig through a more flexible mode of fluid control, a wider gap space (up to 10.2 cm) for TAs, and the ability to accommodate TAs over a wider range of operating temperatures (18 to 95 K) using liquid hydrogen, gaseous helium, or liquid nitrogen as the working fluid, thus supporting direct cooled machines below 77 K.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN63356 , NASA/TM-2019-220046 , E-19642-TN63356
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    Preliminary Computational Assessment of Disk Rotating Detonation Engine Configurations (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The pressure gain combustion (PGC) community is currently investigating rotating detonation engine (RDE) configurations where the flow direction is predominantly radial while the detonation travels circumferentially. These configurations are sometimes referred to as disk rotating detonation engines (DRDE) due to their nominal appearance as two disks in parallel with a gap between them. Having radial flow between disks, as opposed to the conventional RDE with axial flow in an annulus, may have profound effects on both the flow field and the performance. It may also yield extraordinarily compact devices which are well suited to particular propulsion and power applications. This presentation describes a preliminary effort to model the DRDE using a modified computational fluid dynamics (CFD) code originally written for analyzing ordinary RDE's. The quasi-two-dimensional code modifications are described, and some simple test flows are analyzed to insure that the modifications are functioning as envisioned. The code is then used to examine several DRDE scenarios such as radially inward and radially outward devices to see if stable operation is possible and if so, to assess the performance in terms of pressure gain. It is found that several flow scenarios are not only stable, but show superior performance to the ordinary RDE.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN68851 , Programmatic and Industrial Base (PIB); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States|JANNAF Propulsion Meeting (JPM); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States|Propulsion Systems Hazards Subcommittee (PSHS); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States|Exhaust Plume and Signatures Subcommittee (EPSS); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States|Combustion Subcommittee (CS); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States|Airbreathing Propulsion Subcommittee (APS); Jun 03, 2019 - Jun 07, 2019; Dayton, OH; United States
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    Electric Aircraft Cryogenic Cooling with Thermo-Acoustic Exergy Management (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-21
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN68513 , 2019 Cryogenic Engineering Conference and International Cryogenic Materials Conference; Jul 21, 2019 - Jul 25, 2019; Hartford, CT; United States
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    Electromagnetic Mass and Efficiency of Magnetic Gears for Electrified Aircraft (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-30
    Description: Magnetic gears are currently being developed for use in a variety of industries such as wind and automotive, because of their higher reliability and lower maintenance cost than their mechanical counterparts. The bulk of magnetic gear development to date has focused on maximizing the technology's volumetric torque density. In contrast, the primary performance metrics for an aircraft's gear box are its mass and efficiency. To that end this paper presents a study of the achievable electromagnetic specific torque and efficiency of concentric magnetic gears. NASA's second magnetic gear prototype is used as the baseline for this study. Achievable electromagnetic specific torque and efficiency trends are presented with respect to higher level design variables such as gear ratio and radius.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70582 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN
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    Design of a Magnetic Gear for NASA's Vertical Lift Quadrotor Concept Vehicle (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-30
    Description: Magnetic gears are an attractive alternative to mechanical gears for electrified aircraft drive systems due to their ability to transmit torque without mechanical tooth contact. Consequently, magnetic gears enable electrified aircraft to take advantage of the benefits of gearing without introducing most of the contact-related reliability concerns associated with mechanical gearing. Magnetic gears however, have not been shown to match the specific torque (torque/mass) and efficiency of their mechanical counterparts in an aerospace application to date. In this paper, the design of a concentric magnetic gear for a personal air transport NASA reference vehicle is presented to demonstrate the feasibility of a magnetic gear for aerospace applications.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70579 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    Exit Boundary Layer Data for a Round Convergent Nozzle in Support of Numerical Simulation Efforts (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-30
    Description: An experiment is conducted with hot-wire anemometry to document the exit boundary layer characteristics of two nozzle configurations at jet Mach numbers up to 0.82. Far-field noise and jet plume experimental data from these two configurations have been used in Large Eddy Simulations (LES) of jets by colleagues at other Institutions. The current experiment provides the boundary layer data which have been identified as being critical for validation of the simulations since the initial conditions can significantly affect subsequent jet evolution and its radiated noise. The data exhibit fully turbulent boundary layers for the case with a pipe attached upstream of the nozzle. The case without the pipe involves Blasius-like mean velocity profiles but a highly disturbed laminar state with large turbulence intensities in a range of subsonic Mach numbers.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220242 , E-19719 , GRC-E-DAA-TN70914
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    Electrical Power System Sizing Within the Numerical Propulsion System Simulation (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Electrified aircraft propulsion seeks to address ambitious goals in the commercial airline industry, including significant decreases in fuel burn, emissions, noise, and takeoff field length. In order to move these electrified propulsion concepts forward, analysis tools are needed that can model propulsion systems containing both gas turbine and power system components. This work presents the definition of an electric port, a set of electrical power systems tools, and simulation examples for the Numerical Propulsion System Simulation (NPSS) software. NPSS is the industry standard modeling and simulation package for aircraft propulsion systems, and the ability to design, size, integrate, and analyze electric power systems will enable industry efforts towards the development of electrified aircraft propulsion.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70658 , AIAA Propulsion and Energy Forum and Exposition; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    CFD Evaluation Of Lean-Direct Injection Combustors for Commercial Supersonics Technology (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-11
    Description: An overview is given of an effort that focused on using CFD analysis to complement design and configuration definition of Lean-Direct Injection (LDI) combustion concepts for NASA's Commercial Supersonic Transport (CST) program. The National Combustion Code (OpenNCC) was used to perform non-reacting and two-phase reacting flow computations for second and third generation LDI configurations at CST cruise conditions. All computations were performed with a consistent approach of mesh-generation, spray modeling, ignition and kinetics modeling. Emissions (EINOx) characteristics were predicted for CST cruise conditions, and compared with emissions data from experimental measurements to evaluate the fidelity of the CFD modeling approach to predict emissions changes in response to changes in supersonic cycle conditions.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72416 , AIAA Propulsion and Energy Forum; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    High Efficiency Megawatt Machine Rotating Cryocooler Conceptual Design (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: Some of the challenges associated with developing electric aircraft propulsion systems include developing powertrain components that are both efficient and light-weight. In particular, electric motors must simultaneously achieve high efficiency by minimizing electrical and mechanical losses while also achieving high specific power by increasing the torque and/or speed. Normally increasing torque or speed will increase electrical and mechanical losses. The High Efficiency Megawatt Machine (HEMM) minimizes electrical losses by incorporating a superconductor to enable increased current on the rotor. And the rotor spins in a vacuum to minimize thermal and mechanical losses. Some organizations have been developing superconducting rotors for similar reasons using either cryogenic fluid transfer systems, fully immersed cryogenic cooling, and in a few cases utilized built-in cryogenic cooling on the rotor using a Brayton or Stirling system but the implementation was too large or inefficient for effective motor integration. Instead, a new approach for cryogenically cooling the superconducting rotor coil with an embedded rotating cryocooler is presented that fits completely within the rotating shaft.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN71027 , AIAA/IEEE Electric Aircraft Technologies Symposium; Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    Computational Modeling for Non-equilibrium Shock Tube Flows (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-07
    Description: Time accurate simulation of non-equilibrium flows inside shock tube facilities presents several challenges from both physical and mathematical aspects. Furthermore, the drastic computational cost makes it non-practical to support real-time experimental test campaign. In this work, we explore other methods for modeling the shock tube prob- lem with the main focus on the post-shock region and the absolute radiation emanating from it. The proposed alternative approach is several orders of magnitude less computa- tionally expansive while still accurate enough with regards to the quantities of interest. Excellent agreement is found with the well-established stagnation-line approach. Comparison with the time-accurate simulation shows good agreement close to the peak values and disagreement of the temperatures relaxation and radiance profiles toward equilibrium, due to shock speed unsteadiness.
    Keywords: Aircraft Propulsion and Power
    Type: ARC-E-DAA-TN70486 , International Symposium on Shock Waves (ISSW32); Jul 14, 2019 - Jul 19, 2019; Singapore; China
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    X-57 60kW Permanent Magnet Synchronous Cruise Motor Finite Element Electromagnetic Modeling (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-28
    Description: The X-57 60kW Permanent Magnet Synchronous Motor for cruise applications was modeled utilizing a two-dimensional electromagnetics simulation software called Finite Element Method Magnets (FEMM, D. Meeker). Through FEMM, the simulated induction and torque characteristics of the X-57 PMSM were obtained. These parameters and other values were compared to actual static laboratory measurements. A three-dimensional electromagnetic model of the X-57 cruise motor was created utilizing OperaFEA (Dassault Systemes SE, Velizy-Villacoublay, France). Torque, RPM, power, resistance, and inductance characteristics were examined along with establishing work to begin examining heat flow and heat dissipation for efficiency purposes.
    Keywords: Aircraft Propulsion and Power
    Type: AFRC-E-DAA-TN75616 , Southern California Conferences for Undergraduate Research (SCCUR); Nov 23, 2019; San Marcos, CA; United States
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    Design of Low Inductance Busbar for 500 kVA Three-Level ANPC Converter (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-08
    Description: The adoption of SiC devices in high power applications enables higher switching speed, which requires lower circuit parasitic inductance to reduce the voltage overshoot. This paper presents the design of a busbar for a 500 kVA three-level active natural clamped converter. The layout of the busbar is discussed in detail based on the analysis of the multiple commutation loops, magnetic cancelling effect, and DC-link capacitor placement. The loop inductance of the designed busbar is verified with simulation, impedance measurements and converter experiment. The results can match with each other and the inductances of small and large loop are 6.5 nH and 17.5 nH respectively, which is significantly lower than the busbars of NPC type converters in other references.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN68912 , 2019 IEEE Energy Conversion Congress and Exposition; Sep 29, 2019 - Oct 03, 2019; Baltimore, MD; United States
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    Electrical Propulsive Fuselage Concept for Transonic Transport Aircraft (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-08
    Description: NASA is broadly engaged in Electrified Aircraft Propulsion (EAP) efforts across air vehicle sizes and electric aircraft propulsion approaches. EAP enables a wide range of propulsion airframe integration options as well as the use of rechargeable energy storage in an aircraft. This paper is limited to a discussion of boundary layer ingestion (BLI) systems which are located on the fuselage of the aircraft and use electrical drive systems. We term that combination an "electrical propulsive fuselage". The benefits, challenges, and design parameters of an electrically driven fuselage BLI system are considered. Five existing types of fuselage BLI implementation approaches which can be implemented using either electrical or mechanical drive systems are reviewed. An overview of boundary layer types, fan response to boundary layer, and electrical system for aircraft propulsion is presented. An idea distributed electric propulsive fuselage is proposed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72037 , International Society for Air Breathing Engines (ISABE) 2019; Sep 22, 2019 - Sep 27, 2019; Canberra; Australia
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    Pilot Injector Redesign to Reduce N+3 Cycle Emissions for a Gas-Turbine Combustor (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-11
    Description: An overview is given of an effort for the use of CFD analysis to complement design and configuration definition of third generation Lean-Direct Injection combustion concepts (LDI-3) for NASAs N+3 program. The National Combustion Code (OpenNCC) was used to perform non-reacting and two-phase reacting flow computations for a three-cup, nineteen-element flame tube array with redesigned pilot injectors to improve spray and emissions characteristics when compared to a previous LDI-3 design. All computations were performed with a consistent approach to mesh-generation, spray modeling, ignition and kinetics modeling for a medium-power cycle condition. Computational predictions of the aerodynamics of a new pre-filming pilot injector were used to arrive at an optimized aerothermal design that meets effective area and fuel-air mixing criteria. The newly designed pilot injectors were shown to provide considerable improvements in aerodynamic stability, flame-tube pattern factor and NOx emissions, when compared to the original design.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70810 , AIAA Propulsion and Energy Forum; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    Electromagnetic Efficiency and Mass of Magnetic Gears for Electrified Aircraft (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: Magnetic gears are currently being explored to replace mechanical gears in various industries such as wind and automotive due to their higher reliability and lower maintenance requirements. In these applications volume minimization has been the goal of magnetic gear development. In contrast, the primary performance metrics for electrified aircraft drives are mass and efficiency. This paper presents the first ever study of design tradeoffs between electromagnetic mass and efficiency of concentric magnetic gears and the feasibility of achieving the low mass and high efficiency required for electrified aircraft applications. Higher level design variables are considered, including gear ratio, number of magnetic pole pairs, and number of magnets per pole pair.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72224 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    Defining and Measuring Pressure Gain (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: This presentation describes experimental and computational approaches to measuring pressure gain in the various devices currently under investigation wherein the working fluid undergoes a pressure gain combustion (PGC) process. Pressure gain is essentially a measure of the fluid availability for work or thrust production. The devices covered are Resonant Pulse Combustors, Internal Combustion Wave Rotors, Pulse Detonation Engines, and Rotating Detonation Engines. The approaches to pressure gain measurement differ in each device. However, all of the approaches attempt to address the fundamental challenges of PGC system measurement: the extremely harsh environment which makes instrumentation difficult, and the temporal and spatial non-uniformity associated with the exhausting flow which makes assigning a single value to the total pressure difficult. As part of the two-day 2019 International Constant Volume and Detonative Combustion Workshop, held in conjunction with the 2019 AIAA Propulsion and Energy Forum, this presentation is intended to foster discussion and eventual consensus on acceptable measurement methods.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN71983 , International Constant Volume Detonation Combustion Workshop; Aug 17, 2019 - Aug 18, 2019; West Lafayette, IN; United States
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    Fuel Sensitivity of Lean Blowout in a RQL Gas Turbine Combustor (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-06
    Description: Transition from fossil fuels to synthetic drop-in fuels without the need to change existing combustors is the current research topic. The combustor performances such as cold-day ignition limits, lean blow-out (LBO) limits and altitude relight limits are the main focus points. The objective of this work is to evaluate the effect of different fuel candidates on the operability of gas turbines by comparing a conventional petroleum-based fuel with one other alternative fuel candidate. Time filtered Navier-Stokes simulations (TFNS) and K-LES are performed to examine the performance of these fuels at the stable conditions close to blow-out in a referee combustor rig.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70667 , AIAA Propulsion and Energy Forum 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    Combustion and Emissions Study Using a 7-Point Lean Direct Injector Array (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-02
    Description: This paper continues a parametric study in which we consider the effect of air swirler configuration on the flame structure and combustor performance using a circular 7-point Lean Direct Injector Array for gas turbine applications. The injector array consists of a center swirler element surrounded by six swirler elements. Parameters considered in this study include swirler angle (60 or 52), handedness (co-swirling or counter-swirling) and center swirler offset. The primary focus considers flame stability, comparing four key air swirler configurations: for 1) fuel-lean flames; 2) high cold flow air reference velocity flames. We determined that the baseline swirler configuration had the best lean stability and could sustain the highest reference velocity. For this baseline configuration, we also compare the lean-blowout limits of four aircraft gas turbine reference fuels. With regard to lean blow-out, we determined that C4 could sustain the leanest flame, followed closely by A2. A1 was a poor performer.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70824 , ISABE-2019-24404 , The International Society for Air Breathing Engines (ISABE) 2019 Conference; Sep 22, 2019 - Sep 27, 2019; Canberra; Australia
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    Results of NASA's Magnetic Gear Program to Date (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-26
    Description: In rotorcraft, one of the main sources of mechanical failure is the gearbox, because of the many wear and failure modes associated with tooth contact in traditional mechanical gear boxes. Magnetic gears transmit torque without mechanical tooth contact between gear bodies and therefore they have none of the tooth contact related failure modes associated with mechanical gearing. As a result, magnetic gears have the potential to enable more reliable rotorcraft gearboxes. However, magnetic gears have not been demonstrated to match the performance of mechanical gearboxes at a high enough technology readiness level (TRL) to be used on an aircraft to date. To that end, NASA's Revolutionary Vertical Lift Technologies project has made an investment in developing magnetic gearboxes specifically for electrified vertical lift vehicles (EVTOL). In this presentation, the results of that investment to date will be discussed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN73679 , Vertical Flight Society (VFS) Propulsion and Power Technical Meeting; Oct 29, 2019 - Oct 30, 2019; Hampton, VA; United States
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    NASA Investments in Electrified Propulsion (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-18
    Description: Presentation to the International Forum on Aviation (IFAR) at the Electric Hybrid Propulsion Workshop #2 in Budapest, Hungary. This presentation is to provide an overview of NASA's investments in electrified propulsion as a starting point for the workshop, which will concentrate on the safety of electrified airplanes and potential for international collaboration.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN74945
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    NASA Electrified Propulsion Research Summary (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-09
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN74525 , HQ-E-DAA-TN72474 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS); Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States|Energy Tech; Oct 22, 2019 - Oct 24, 2019; Cleveland, OH; United States
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    Applying Optical Diagnostics to Study Aircraft Gas Turbine Combustor Performance (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-03
    Description: This is for an invited lecture at Cleveland State University for a combustion course. The presentation gives an overview of some of the optical diagnostic techniques the Combustion Branch uses to characterize research fuel injection concepts to reduce emissions. Examples are provided that come from previously presented conference papers
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN74916
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    Effective Oxidation Model for Light-Weight Carbon Preform Ablators (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-16
    Description: Porous Microstructure Analysis (PuMA) software is used to perform simulations of molecular beam scattering experiments of hyperthermal atomic oxygen striking FiberFormr, a carbon preform material used commonly as a precursor in thermal protection systems (TPS). The purpose of this study is to investigate the reactive interaction of fibrous carbon with atomic oxygen in a complex microstructure, which is the primary source of carbon removal at lower temperatures. The detailed micro-structure of FiberFormr obtained from X-ray micro-tomography is used in the PuMA simulations to capture the complexity of the porous and fibrous characteristic of FiberFormr. A finite-rate surface chemistry model recently constructed from the molecular beam scattering experiments on vitreous carbon is applied to each fiber of the FiberFormr material. This model consists of detailed surface reaction mechanisms such as adsorption, desorption, and several types of Langmuir-Hinshelwood (LH) reactions to characterize the oxygen-carbon interactions at the surface. Comparison between the experimental and PuMA time-of-flight (TOF) distributions of both O and CO show good agreement. It is also found that a significantly higher amount of CO is generated when the beam interacted with FiberFormr, when compared with vitreous carbon. This is postulated to be primarily a result of multiple collisions of oxygen with the fibers, resulting in an higher effective rate of CO production. Multiple collisions with the different fibers, resulting from the porous nature of FiberFormr is also found to thermalize the O atoms, in addition to the adsorption/desorption process. The effect of micro-structure is concluded to be crucial in determining the final composition and energy distributions of the products. Thus, an effective model for the oxygen interaction with FiberFormr, fully accounting for the detailed micro-structure, for use in Computational Fluid Dynamics (CFD) and material response codes, is presented.
    Keywords: Aircraft Propulsion and Power
    Type: ARC-E-DAA-TN64596 , AIAA SciTech Forum 2019; Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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    Feasibility of Electrified Propulsion for Ultra-Efficient Commercial Aircraft Final Report (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-18
    Description: MIT, Aurora Flight Sciences, and USC have collaborated to assess the feasibility of electric, hybridelectric, and turbo-electric propulsion for ultra-efficient commercial transportation. The work has drawn on the team expertise in disciplines related to aircraft design, propulsion-airframe integration, electric machines and systems, engineering system design, and optimization. A parametric trade space analysis has been carried out to assess vehicle performance across a range of transport missions and propulsion architectures to establish how electrified propulsion systems scale. An optimization approach to vehicle conceptual design modeling was taken to enable rapid multidisciplinary design space exploration and sensitivity analysis. The results of the analysis indicate vehicle aero-propulsive integration benefits enabled by electrification are required to offset the increased weight and loss associated with the electric system and achieve enhanced performance; the report describes the conceptual configurations than can offer such enhancements. The main contribution of the present work is the definition of electric vehicle design attributes for potential efficiency improvements at different scales. Based on these results, key areas for future research are identified, and extensions to the trade space analysis suitable for higher fidelity electrified commercial aircraft design and analysis have been developed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72076 , NASA/CR—2019-220382
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    A Control Strategy for Turbine Electrified Energy Management (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-07
    Description: Hybrid electric propulsion architectures provide the infrastructure to enable additional benefits to the propulsion system that are otherwise unrealizable with the sole use of the current, state-of-the-art, gas-driven, turbine engines. The presence of electric machines (EMs) coupled to the shaft(s) of the turbine engine provide the ability to actively alter the operation of the engine to the benefit of the propulsion system and the aircraft it propels. This is the goal of the Turbine Electrified Energy Management (TEEM) concept, which at its broadest level addresses the management of energy across the electrified propulsion system. Prior work has demonstrated the use of this concept to alter steady-state operation and improve transient operability of a hybrid-electric propulsion system. The main benefits previously illustrated include the elimination of stability bleeds and expansion of the turbomachinery design space in order to enable more efficient designs. This paper focuses on the development of control strategies to implement the TEEM concept, and it explores several possible architecture variants for applying this concept. Comparison studies are conducted between a purely gas-driven turbofan (baseline engine configuration) and TEEM augmented variants of the baseline engine. The variants are distinguished by the shaft(s) that possess an EM. The configurations consider EMs on both shafts, an EM on the high pressure spool (HPS) only, and an EM on the low pressure spool (LPS) only. These configurations are referred to as the dual-spool configuration, the HPS configuration, and LPS configuration, respectively. The studies expose several options in configuring and controlling the system, including the use of a single EM coupled to a single shaft of a two-spool engine to positively impact the operability of both shafts. The studies also demonstrate the use of independently designed controllers for the electric machine(s) that allow for a decoupled control design process.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70128 , AIAA/IEEE Electric Aircraft Technology Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    NASA Electrified Aircraft Propulsion Efforts (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-14
    Description: NASA's broad investments in Electrified Aircraft Propulsion (EAP) are reviewed in this paper. NASA investments are guided by an assessment of potential market impacts, technical key performance parameters, and technology readiness attained through a combination of studies, enabling fundamental research, and flight research. NASA has determined that the impact of EAP varies by market and NASA is considering three markets: national/international, on-demand mobility, and short haul regional air transport. Flight research is underway to demonstrate integrated solutions and inform standards and certification processes. This paper focuses on the vehicle related activities, however there are related NASA activities in air space management and vehicle autonomy activities as well as a breakthrough technology project called the Convergent Aeronautics Solutions Project. A key finding is that sufficient technical advances in key areas have been made which indicate EAP is a viable technology for aircraft. Significant progress has been made to reduce EAP adoption barriers and further work is needed to transition the technology to a commercial product and improve the technology so it is applicable to large transonic aircraft. This paper will review the activities of the Hybrid Gas Electric Subproject of the Advanced Air Transport Technology Project, the Revolutionary Vertical Lift Technology Project, and the X-57 Flight Demonstration Project, and discuss the potential EAP benefits for commercial and military applications.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72947 , Hybrid/Electric Aero-Propulsion Systems for Military Applications; Oct 07, 2019 - Oct 09, 2019; Trondheim; Norway
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    CFD Evaluation of Lean-Direct Injection Combustors for Commercial Supersonics Technology (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: An overview is given of an effort that focused on using CFD analysis to complement design and configuration definition of Lean-Direct Injection (LDI) combustion concepts for NASA's Commercial Supersonic Transport (CST) program. The National Combustion Code (OpenNCC) was used to perform non-reacting and two-phase reacting flow computations for second and third generation LDI configurations at CST cruise conditions. All computations were performed with a consistent approach of mesh-generation, spray modeling, ignition and kinetics modeling. Emissions (EINOx) characteristics were predicted for CST cruise conditions, and compared with emissions data from experimental measurements to evaluate the fidelity of the CFD modeling approach to predict emissions changes in response to changes in supersonic cycle conditions.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70736 , AIAA Propulsion and Energy Forum 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    High Efficiency Megawatt Machine Rotating Cryocooler Conceptual Design (2019)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Some of the challenges associated with developing electric aircraft propulsion systems include developing powertrain components that are both efficient and light-weight. In particular, electric motors must simultaneously achieve high efficiency by minimizing electrical and mechanical losses while also achieving high specific power by increasing the torque and/or speed. Normally increasing torque or speed will increase electrical and mechanical losses. The High Efficiency Megawatt Machine (HEMM) minimizes electrical losses by incorporating a superconductor to enable increased current on the rotor. And the rotor spins in a vacuum to minimize thermal and mechanical losses. Some organizations have been developing superconducting rotors for similar reasons using either cryogenic fluid transfer systems, fully immersed cryogenic cooling, and in a few cases utilized built-in cryogenic cooling on the rotor using a Brayton or Stirling system but the implementation was too large or inefficient for effective motor integration. Instead, a new approach for cryogenically cooling the superconducting rotor coil with an embedded rotating cryocooler is presented that fits completely within the rotating shaft.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70902 , AIAA/IEEE Electric Aircraft Technologies Symposium; Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    Exit Boundary Layer Data for a Round Convergent Nozzle in Support of Numerical Simulation Efforts (2019)
    In:  Other Sources
    Details
    Publication Date: 2019-08-22
    Description: An experiment is conducted with hot-wire anemometry to document the exit boundary layer characteristics of two nozzle configurations at jet Mach numbers up to 0.82. Far-field noise and jet plume experimental data from these two configurations have been used in Large Eddy Simulations (LES) of jets by colleagues at other Institutions. The current experiment provides the boundary layer data which have been identified as being critical for validation of the simulations since the initial conditions can significantly affect subsequent jet evolution and its radiated noise. The data exhibit fully turbulent boundary layers for the case with a pipe attached upstream of the nozzle. The case without the pipe involves Blasius-like mean velocity profiles but a highly disturbed laminar state with large turbulence intensities in a range of subsonic Mach numbers.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220242/SUPP , E-19719 , GRC-E-DAA-TN70914
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    Control Technology Needs for Electrified Aircraft Propulsion Systems (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Electrified aircraft propulsion (EAP) systems hold potential for the reduction of aircraft fuel burn, emissions, and noise. Currently, NASA and other organizations are actively working to identify and mature technologies necessary to bring EAP designs to reality. This paper specifically focuses on the envisioned control technology challenges associated with EAP designs that include gas turbine technology. Topics discussed include analytical tools for the dynamic modeling and analysis of EAP systems, and control design strategies at the propulsion and component levels. This includes integrated supervisory control facilitating the coordinated operation of turbine and electrical components, control strategies that seek to minimize fuel consumption and lessen the challenges associated with thermal management, and dynamic control to ensure engine operability during system transients. These dynamic control strategies include innovative control approaches that either extract or supply power to engine shafts dependent upon operating phase, which may improve performance and reduced gas turbine engine weight. Finally, a discussion of control architecture design considerations to help alleviate the propulsion/aircraft integration and certification challenges associated with EAP systems is provided.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN69695 , ASME Turbo Expo 2019; Jun 17, 2019 - Jun 21, 2019; Phoenix, AZ; United States
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    Control Technology Needs for Electrified Aircraft Propulsion Systems (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Electrified aircraft propulsion (EAP) systems hold potential for the reduction of aircraft fuel burn, emissions, and noise. Currently, NASA and other organizations are actively working to identify and mature technologies necessary to bring EAP designs to reality. This paper specifically focuses on the envisioned control technology challenges associated with EAP designs that include gas turbine technology. Topics discussed include analytical tools for the dynamic modeling and analysis of EAP systems, and control design strategies at the propulsion and component levels. This includes integrated supervisory control facilitating the coordinated operation of turbine and electrical components, control strategies that seek to minimize fuel consumption and lessen the challenges associated with thermal management, and dynamic control to ensure engine operability during system transients. These dynamic control strategies include innovative control approaches that either extract or supply power to engine shafts dependent upon operating phase, which may improve performance and reduced gas turbine engine weight. Finally, a discussion of control architecture design considerations to help alleviate the propulsion/aircraft integration and certification challenges associated with EAP systems is provided.
    Keywords: Aircraft Propulsion and Power
    Type: GT2019-91413 , GRC-E-DAA-TN65573 , ASME Turbomachinery Technical Conference & Exposition; Jun 17, 2019 - Jun 21, 2019; Phoenix, AZ; United States
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    A New Recycling Method to Generate Turbulent Inflow Profiles (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The accuracy of the scale-resolving simulations for practical geometries strongly depends on the inflow boundary conditions. Imposing experimentally observed turbulent inflow profiles for the numerical simulations is a major challenge. Existing methods available in the literature assume self-similar behavior, which is not true for most of the experiments. In the present work, we formulate the turbulent inflow profile generation technique as an optimization problem. An adjoint technique is exploited to evaluate the sensitivities of multiple input parameters for the present problem. The present formulation is then tested to generate a laminar boundary layer profile, turbulent boundary layer profile, and turbulent jet profile.
    Keywords: Aircraft Propulsion and Power
    Type: ARC-E-DAA-TN69970 , AIAA Aviation 2019; Jun 17, 2019 - Jun 21, 2019; Dallas, TX; United States
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    Lessons Learned in Fabrication of a High-Specific-Torque Concentric Magnetic Gear (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Magnetic gearing is being investigated at NASA as a replacement to conventional mechanical gearing in aerospace applications. Some key benefits of magnetic gears over mechanical gearing are torque transmission without mechanical contact, decreased transmission noise, less frequent maintenance, and lack of lubrication. In order to take advantage of these benefits in aerospace applications, magnetic gearing must be shown to provide high enough specific torque (torque per unit mass). Prototype 2 (PT-2), developed to maximize specific torque, and fabricated at NASA Glenn Research Center, has shown promising specific torque comparable to low torque mechanical gears. This work will briefly review the electromagnetic and structural design of PT-2, provide detailed information on fabrication and assembly, examine build errors, walk through rebuild efforts to improve operation, and conclude with remarks on build difficulties and opportunities for improvement in future prototypes.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN67458 , Vertical Flight Society Annual Forum and Technology Display; May 13, 2019 - May 16, 2019; Philadelphia, PA; United States
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  • 60
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    The Effect of Incoming Boundary Layer Characteristics on the Performance of a Distributed Propulsion System (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An experimental study is conducted in an effort to advance the understanding of flow physics associated with a boundary layer ingesting, distributed propulsion system. The influence of incoming boundary layer thickness and flow distortions are studied on the flow downstream and the overall performance of the system. The propulsion model, fabricated using additive manufacturing and integrated with electrical fans, is mounted on a flat plate and tested at subsonic speeds. Detailed characterization of the incoming boundary layer and subsequent assessment of the downstream flow field is performed using hotwire anemometry. Modification of the incoming boundary layer is achieved by placing tripping devices, such as rods and vortex generating ramps, near the leading edge of the flat plate. The overall performance of the system for different incoming flow conditions is analyzed by comparing magnitudes of exhaust velocities as well as estimated propulsive power to the corresponding baseline values. For a constant input power to the fans, smaller upstream flow distortions and moderately thickened boundary layers result in marginal changes in the flow field downstream. On the other hand, notable reductions in downstream flow velocities and propulsive power are observed in the case of a significantly thicker and/or distorted incoming boundary layer. It is hoped that this study will serve as a database for this technologically relevant flow field that has not been explored adequately before.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM—2019-220068 , E-19658 , GRC-E-DAA-TN65193 , 2019 Science and Technology Forum (SciTech); Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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  • 61
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    Operational Stability Limits in Rotating Detonation Engine Numerical Simulations (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An instability is described which arises in computational fluid dynamic (CFD) simulations of semi-idealized rotating detonation engines (RDE) configured with a throat at the exit. Its existence is verified by examining output from two independently developed CFD codes simulating the same configuration and producing solutions that agree well. The instability is shown to be thermo-acoustic in that a spatial integral of the product of pressure and heat release fluctuations develops a regular oscillation which grows in time. The instability can become severe enough to cause detonation failure. Its onset is shown to be closely linked to the size of the exit throat and the size of the inlet restriction; both parameters that strongly influence RDE performance. It is shown that the instability places a cap on ideal RDEperformance, but that an optimized exhaust throat and inlet restriction combination still yields substantial pressure gain. Other parametric sensitivities are also examined in terms ofinstability growth. These include axial length, inlet manifold pressure, and air-fuel ratio.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN63619 , AIAA SciTech Forum 2019; Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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  • 62
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    Experimental Investigation of a One-Sided Ejector Nozzle (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A fundamental exploratory experiment is conducted assessing the performance of a one-sided ejector with the eventual goal of noise reduction for jet engines. The hardware is comprised of an 8:1 rectangular nozzle together with an ejector box whose lower surface is flush with the lower lip of the nozzle. Secondary flow is allowed through a gap between the upper lip of the nozzle and a flap that constitutes the upper surface of the ejector. Wall static pressures and Pitot probe surveys are conducted to evaluate the performance of the ejector with variation of geometric parameters. It is found that addition of vortex generating tabs at the upper lip of the nozzle significantly increases secondary flow entrainment. The entrainment is further enhanced by a divergence of the ejector up-per surface. Limited noise measurements are done. The baseline ejector (without tabs) often encounters flow resonance with accompanying tones. The tabs have the additional benefit of eliminating those tones in all cases. However, for the tabbed case, addition of the ejector produces insignificant further noise reduction. This is due to the fact that the flow remains unmixed on the lower half of the ejector. The focus of ongoing and future efforts is to achieve sufficient mixing of the flow so that the exhaust velocities are uniformly low, while keeping the ejector hardware short and light-weight.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN62981 , SciTech 2019; Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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  • 63
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    Multi-Point Design and Optimization of a Turboshaft Engine for a Tiltwing Turboelectric VTOL Air Taxi (2019)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the design of a turboshaft engine for a tiltwing air taxi application. In this case, the tiltwing air taxi is intended to fly a 400-nautical mile mission with up to fifteen passengers. Engine requirements for the concept engine are taken from aircraft system studies where thrust is produced by four propellers driven by electric motors and powered by a single gas turbine engine. The purpose of this paper is to perform a cycle design optimization that minimizes fuel consumption and weight while respecting current technology limitations to meet mission requirements. To achieve results, the engine overall pressure ratio and maximum temperature at the exit of the combustor are set as the design parameters. Several sensitivity studies are also performed to visualize optimization trends. Results of the optimization study show solutions are heavily dependent on engine cooling flow requirements and exact mission requirements. This engine is intended for use in large system optimization research.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN62826 , AIAA SciTech Forum 2019; Jan 07, 2019 - Jan 11, 2019; San Diego, CA; United States
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  • 64
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    Evaluation of Electrical System Requirements for Implementing Turbine Electrified Energy Management (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-05
    Description: Turbine Electrified Energy Management (TEEM) is a concept concerned with the management of energy in an electrified propulsion system. The management of energy in the hybrid-electric architecture has potential to benefit the turbomachinery and the aircraft it powers. The concept is particularly useful for improving operability during transient operation and could be leveraged to design a better performing engine. The concept utilizes electric machines coupled to the engine shafts and an electric power distribution system that includes energy storage. A controller is used to decide when and how energy is moved around the electrified propulsion system, particularly when considering energy conversion between mechanical and electrical forms. Prior work has shown that the electric machines can be used to supply/or extract supplemental power to/from the engine shafts to improve their operability and achieve or enable propulsion efficiency and performance benefits. However, the previous studies did not consider the practical constraints of the electrical machines and energy storage devices that are required for implementing the TEEM system architecture concept. This paper presents an integrated engine and electrical system model that is used to evaluate the electrical system requirements. The model captures the physics of the conceptual, Advanced Geared Turbofan 30,000lbf (AGTF30) engine, which features advanced technologies such as a compact gas turbine and a variable area fan nozzle. For this work, the engine is augmented with electrical system components that allow for the implementation of the TEEM concept. The evaluation presented suggests the potential of the TEEM concept to provide performance benefits for a turbofan engine.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70911 , AIAA/IEEE Electric Aircraft Technology Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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  • 65
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    Pilot Injector Redesign to Reduce N+3 Cycle Emissions for a Gas-Turbine Combustor (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-13
    Description: An overview is given of an effort for the use of CFD analysis to complement design and configuration definition of third generation Lean-Direct Injection combustion concepts (LDI-3) for NASA's N plus 3 program. The National Combustion Code (OpenNCC) was used to perform non-reacting and two-phase reacting flow computations for a three-cup, nineteen-element flametube array with redesigned pilot injectors to improve spray and emissions characteristics when compared to a previous LDI-3 design. All computations were performed with a consistent approach to mesh-generation, spray modeling, ignition and kinetics modeling for a "medium-power" cycle condition. Computational predictions of the aerodynamics of a new pre-filming pilot injector were used to arrive at an optimized aerothermal design that meets effective area and fuel-air mixing criteria. The newly designed pilot injectors were shown to provide considerable improvements in aerodynamic stability, flame-tube pattern factor and NOx emissions, when compared to the original design.
    Keywords: Aircraft Propulsion and Power
    Type: AIAA 2019-4371 , GRC-E-DAA-TN72414 , AIAA/SAE/ASEE Joint Propulsion and Energy Forum and Exposition 2019 ; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    Design of a Magnetic Gear for NASA's Vertical Lift Quadrotor Reference Vehicle (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-11
    Description: Magnetic gears are an attractive alternative to mechanical gears for electrified aircraft drive systems due to their ability to transmit torque without mechanical tooth contact. Consequently, magnetic gears enable electrified aircraft to take advantage of the benefits of gearing without introducing most of the contact-related reliability concerns associated with mechanical gearing. Magnetic gears however, have not been shown to match the specific torque (torque/mass) and efficiency of their mechanical counterparts in an aerospace application to date. In this paper, the design of a concentric magnetic gear for a personal air transport NASA reference vehicle is presented to demonstrate the feasibility of a magnetic gear for aerospace applications.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72227 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS 2019); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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  • 67
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    Fuel Sensitivity of Lean Blowout in a RQL Gas Turbine Combustor (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-17
    Description: Transition from fossil fuels to synthetic drop-in fuels without the need to change existing combustors is the current research topic. The combustor performances such as cold-day ignition limits, lean blow-out (LBO) limits and altitude relight limits are the main focus points. The objective of this work is to evaluate the effect of different fuel candidates on the operability of gas turbines by comparing a conventional petroleum-based fuel with one other alternative fuel candidate. Time filtered Navier-Stokes simulations (TFNS) and K-LES are performed to examine the performance of these fuels at the stable conditions close to blow-out in a referee combustor rig.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72312 , AIAA Propulsion and Energy Forum 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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  • 68
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    An Analysis of the Strayton Engine, a Brayton and Stirling Cycle Recuperating Engine (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: This paper explores the novel Strayton engine concept. This engine combines the cycles of a Brayton engine with that of a Stirling engine to create a highly efficient recuperating gas turbine engine. In the explored case, both Brayton cycle and Stirling cycle engines are used to generate electrical power. Additionally, the Stirling engine is used to draw heat out of the Brayton turbine (acting to cool the turbine blades), while also pumping heat into Brayton cycle just before combustion occurs (acting as the mechanism for recuperation). The purpose of this paper is to detail the system level modeling techniques used to generate the simulation, perform a cycle analysis of the combined cycle engine, identify key technologies and challenges associated with the concept, and compare potential performance gains with existing gas turbine engines and internal combustion engines. Topics such as controls, blade cooling effects, engine weight, and heat transfer using heat pipe are also explored. Results from this work show potential architectures that could provide the required heat transfer rates, potential control strategies, and performance benefits, including efficiency gains between 10% and 3% on engines ranging from 200HP to 670HP with the combined cycle engine.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN71720 , AIAA Propulsion and Energy Forum 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    Dynamic Analysis of the STARC-ABL Propulsion System (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: In the pursuit of Electrified Aircraft Propulsion (EAP), much of the attention is on the development of hybrid electric concept vehicles and their propulsion systems from a steady state performance perspective. While it is steady-state performance that largely determines the efficiency of civil air transports, engine operability and transient performance define constraints for the steady state design that impact efficiency and system viability. Neglecting dynamics and control technologies can result in an over-designed, sub optimal propulsion system or a concept that is not feasible. Thus, dynamic system studies were conducted on the propulsion system of the conceptual aircraft design known as the Single-aisle Turboelectric AiRCraft with Aft Boundary Layer propulsor (STARC-ABL). This paper describes the development of a controller to verify the baseline concept's feasibility from an operability perspective. Further, studies were conducted to identify excessive stability margin in the baseline design that could be traded for potential benefits in efficiency through an engine re design. This study revealed the potential to reduce the high pressure compressor (HPC) stall margin by 3%. Finally, a study was conducted to investigate the potential benefit of adding energy storage to the STARC-ABL concept that further improves operability and enables more gains in engine efficiency and performance. The energy storage provided an additional 0.5% stall margin can be removed from the HPC.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN70106 , AIAA Propulsion and Energy Forum; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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    Control Technology Needs for Electrified Aircraft Propulsion Systems (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-04
    Description: Electrified aircraft propulsion (EAP) systems hold potential for the reduction of aircraft fuel burn, emissions, and noise. Currently, NASA and other organizations are actively working to identify and mature technologies necessary to bring EAP designs to reality. This paper specifically focuses on the envisioned control technology challenges associated with EAP designs that include gas turbine technology. Topics discussed include analytical tools for the dynamic modeling and analysis of EAP systems, and control design strategies at the propulsion and component levels. This includes integrated supervisory control facilitating the coordinated operation of turbine and electrical components, control strategies that seek to minimize fuel consumption and lessen the challenges associated with thermal management, and dynamic control to ensure engine operability during system transients. These dynamic control strategies include innovative control approaches that either extract or supply power to engine shafts dependent upon operating phase, which may improve performance and reduced gas turbine engine weight. Finally, a discussion of control architecture design considerations to help alleviate the propulsion/aircraft integration and certification challenges associated with EAP systems is provided.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220296 , GRC-E-DAA-TN70505 , E-19721 , ASME Turbomachinery Technical Conference & Exposition; Jun 17, 2019 - Jun 21, 2019; Phoenix, AZ; United States
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    Reliability Requirements and Research Strategies for Urban Air Mobility Propulsion (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-21
    Description: An emerging new mission for aeronautics is Urban Air Mobility (UAM), a concept for air transportation around metropolitan areas with passenger-carrying operations. UAM vehicles must be capable of vertical take-off and landing, and this requirement presents unique technical challenges for electric and hybrid-based vertical take-off and landing (eVTOL). A critical challenge for UAM market growth is to gain public acceptance for being as safe as - or safer than - commercial air travel and automotive transportation. There is a lack of data for propulsion systems, components, and the associated thermal management systems for UAM eVTOL propulsion systems. The new mission, new propulsion system concepts, safety criticality of propulsion component performance during vertical take-off and lift operations, and lack of data presents many research challenges and opportunities. NASA has developed and published UAM vehicle concept studies. For a subset of the said concept vehicles, NASA has contracted for a study to identify failure modes and hazards associated with the propulsion systems of the concept vehicles and to perform functional hazard analyses (FHA) and failure modes and effects criticality analyses (FMECA) for each. From the completed study results, it was recommended for NASA to support research toward developing electric/hybrid-electric propulsion components with improved reliability and to explore powertrain architectures that can take advantage of higher reliability components to achieve inherent air-vehicle safety. NASA has started a research effort for UAM propulsion with a focus toward improving safety and reliability. Recent results and research strategy will be discussed toward the goals by means of: 1) improving individual component reliability through advanced materials and design methods, 2) improving the thermal management system, and 3) designing propulsion system architectures to provide inherent UAM vehicle safety.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN74347 , 2019 Propulsion and Power Technical Meeting; Oct 29, 2019 - Oct 30, 2019; Hampton, VA; United States
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  • 72
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    Near-Exit Pressure Fluctuations in Jets from Circular and Rectangular Nozzles (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-15
    Description: This article documents some experimental observations made for near-exit unsteady pressure fluctuations in high-speed jets. These fluctuations are apparently related to trapped waves within the jet potential core as investigated and reported recently by other researchers. Round nozzles of three different diameters and rectangular nozzles of three different aspect ratios are studied. The pressure fluctuations manifest as a series of peaks in the spectra. These trapped wave spectral peaks are found with all nozzles. Their characteristics and variations with axial and radial distances as well as with jet Mach number are documented. Effects of initial boundary layer state and the presence of a surface nearby as well as the scaling of the frequencies of the spectral peaks are studied and discussed.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM—2019-220383 , GRC-E-DAA-TN74374
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  • 73
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    Pressure Gain Combustion for High Speed Propulsion (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-15
    Description: This presentation contains notes for a one-hour lecture that is part of a two-day AIAA Short Course titled, Hypersonic Air-Breathing Propulsion: Emerging Technologies and Cycles. The presentation covers an introduction to Pressure Gain Combustion (PGC) and its applicability to high speed airbreathing propulsion (HSABP). The concept of PGC is discussed on a thermodynamic basis, the performance benefits are demonstrated, and methods of implementation are described. These include devices such as Resonant Pulse Combustors, Internal Combustion Wave Rotors, Pulse Detonation Engines, and Rotating Detonation Engines.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN71710 , Propulsion and Energy 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN
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    NASA Electrified Aircraft Propulsion Efforts (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-14
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72959 , Hybrid/Electric Aero-Propulsion Systems for Military Applications; Oct 07, 2019 - Oct 09, 2019; Trondheim; Norway
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  • 75
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    A Control Strategy for Turbine Electrified Energy Management (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-07
    Description: Hybrid electric propulsion architectures provide the infrastructure to enable additional benefits to the propulsion system that are otherwise unrealizable with the sole use of the current, state-of-the-art, gas-driven, turbine engines. The presence of electric machines (EMs) coupled to the shaft(s) of the turbine engine provide the ability to actively alter the operation of the engine to the benefit of the propulsion system and the aircraft it propels. This is the goal of the Turbine Electrified Energy Management (TEEM) concept, which at its broadest level addresses the management of energy across the electrified propulsion system. Prior work has demonstrated the use of this concept to alter steady-state operation and improve transient operability of a hybrid-electric propulsion system. The main benefits previously illustrated include the elimination of stability bleeds and expansion of the turbomachinery design space in order to enable more efficient designs. This paper focuses on the development of control strategies to implement the TEEM concept, and it explores several possible architecture variants for applying this concept. Comparison studies are conducted between a purely gas-driven turbofan (baseline engine configuration) and TEEM augmented variants of the baseline engine. The variants are distinguished by the shaft(s) that possess an EM. The configurations consider EMs on both shafts, an EM on the high pressure spool (HPS) only, and an EM on the low pressure spool (LPS) only. These configurations are referred to as the dual-spool configuration, the HPS configuration, and LPS configuration, respectively. The studies expose several options in configuring and controlling the system, including the use of a single EM coupled to a single shaft of a two-spool engine to positively impact the operability of both shafts. The studies also demonstrate the use of independently designed controllers for the electric machine(s) that allow for a decoupled control design process.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220353 , GRC-E-DAA-TN73066
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  • 76
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    Dynamic Analysis of the STARC-ABL Propulsion System (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-07
    Description: In the pursuit of Electrified Aircraft Propulsion (EAP), much of the attention is on the development of hybrid electric concept vehicles and their propulsion systems from a steady state performance perspective. While it is steady-state performance that largely determines the efficiency of civil air transports, engine operability and transient performance define constraints for the steady state design that impact efficiency and system viability. Neglecting dynamics and control technologies can result in an over-designed, sub optimal propulsion system or a concept that is not feasible. Thus, dynamic system studies were conducted on the propulsion system of the conceptual aircraft design known as the Single-aisle Turboelectric AiRCraft with Aft Boundary Layer propulsor (STARC-ABL). This paper describes the development of a controller to verify the baseline concept's feasibility from an operability perspective. Further, studies were conducted to identify excessive stability margin in the baseline design that could be traded for potential benefits in efficiency through an engine re design. This study revealed the potential to reduce the high pressure compressor (HPC) stall margin by 3%. Finally, a study was conducted to investigate the potential benefit of adding energy storage to the STARC-ABL concept that further improves operability and enables more gains in engine efficiency and performance. The energy storage provided an additional 0.5% stall margin can be removed from the HPC.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220352 , AIAA–2019–4182 , GRC-E-DAA-TN73064 , AIAA Propulsion and Energy Forum; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
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  • 77
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    Evaluation of Electrical System Requirements for Implementing Turbine Electrified Energy Management (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-07
    Description: Turbine Electrified Energy Management (TEEM) is a concept concerned with the management of energy in an electrified propulsion system. The management of energy in the hybrid-electric architecture has potential to benefit the turbomachinery and the aircraft it powers. The concept is particularly useful for improving operability during transient operation and could be leveraged to design a better performing engine. The concept utilizes electric machines coupled to the engine shafts and an electric power distribution system that includes energy storage. A controller is used to decide when and how energy is moved around the electrified propulsion system, particularly when considering energy conversion between mechanical and electrical forms. Prior work has shown that the electric machines can be used to supply/or extract supplemental power to/from the engine shafts to improve their operability and achieve or enable propulsion efficiency and performance benefits. However, the previous studies did not consider the practical constraints of the electrical machines and energy storage devices that are required for implementing the TEEM system architecture concept. This paper presents an integrated engine and electrical system model that is used to evaluate the electrical system requirements. The model captures the physics of the conceptual, Advanced Geared Turbofan 30,000lbf (AGTF30) engine, which features advanced technologies such as a compact gas turbine and a variable area fan nozzle. For this work, the engine is augmented with electrical system components that allow for the implementation of the TEEM concept. The evaluation presented suggests the potential of the TEEM concept to provide performance benefits for a turbofan engine.
    Keywords: Aircraft Propulsion and Power
    Type: NASA/TM-2019-220354 , Paper AIAA–2019–4502 , GRC-E-DAA-TN73068 , AIAA/IEEE Electric Aircraft Technology Symposium (EATS); Aug 22, 2019 - Aug 24, 2019; Indianapolis, IN; United States
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    Propulsion System Optimization for a Turboelectric Tiltwing Urban Air Mobility Aircraft (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-22
    Description: An emerging potential market within the aviation industry is short, frequent air taxi flights within the urban airspace. These air taxis (also called urban air mobility or UAM vehicles) are envisioned to be vertical take-o and landing designs which are capable of carrying 1 to 15 passengers in an intra-urban environment with less than 50 nautical miles of range. Numerous vehicle conceptual designs have been proposed by various industry and government organizations to fulfill these potential missions. These concepts are enabled by recent advancements in a number of areas including propulsion and power systems. While new technologies are making these vehicles possible, this new UAM design space is large, unexplored, and multidisciplinary in nature. New challenges exist in identifying and creating optimized designs for these unique vehicles with new propulsion technologies. This work presents the development of a suite of propulsion system analysis tools, which when coupled together, can improve the multidisciplinary conceptual design and optimization of UAM vehicle propulsion systems. These analysis tools are then applied to the design optimization of a turboelectric propulsion system for a notional UAM tiltwing concept. The optimization demonstration for this vehicle shows how a tightly-coupled multidisciplinary design can be developed which considers both physical design characteristics and operating schedules. Furthermore, the results explore trade-o s in the thermal management system design and how those trade-o s impact the overall vehicle.
    Keywords: Aircraft Propulsion and Power
    Type: ISABE-2019-24365 , GRC-E-DAA-TN71922 , International Society for Air Breathing Engines (ISABE) Conference; Sep 22, 2019 - Sep 27, 2019; Canberra, ACT; Australia
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  • 79
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    Dynamic Analysis of the STARC-ABL Propulsion System (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-10
    Description: In the pursuit of Electrified Aircraft Propulsion (EAP), much of the attention is on the development of hybrid electric concept vehicles and their propulsion systems from a steady state performance perspective. While it is steady-state performance that largely determines the efficiency of civil air transports, engine operability and transient performance define constraints for the steady state design that impact efficiency and system viability. Neglecting dynamics and control technologies can result in an over-designed, sub optimal propulsion system or a concept that is not feasible. Thus, dynamic system studies were conducted on the propulsion system of the conceptual aircraft design known as the Single-aisle Turboelectric AiRCraft with Aft Boundary Layer propulsor (STARC-ABL). This paper describes the development of a controller to verify the baseline concept's feasibility from an operability perspective. Further, studies were conducted to identify excessive stability margin in the baseline design that could be traded for potential benefits in efficiency through an engine re design. This study revealed the potential to reduce the high pressure compressor (HPC) stall margin by 3%. Finally, a study was conducted to investigate the potential benefit of adding energy storage to the STARC-ABL concept that further improves operability and enables more gains in engine efficiency and performance. The energy storage provided an additional 0.5% stall margin can be removed from the HPC.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72121 , AIAA Propulsion and Energy Forum 2019; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
    Format: application/pdf
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  • 80
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    Introduction to Dynamic Propulsion System Modeling for Control Design, Analysis, and Simulation (2019)
    In:  CASI
    Details
    Publication Date: 2019-10-19
    Description: This is an oral presentation on dynamic propulsion system modeling for control design, analysis, and simulation. These tools have been developed at NASA Glenn Research Center.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN72034 , AIAA Propulsion and Energy Forum; Aug 19, 2019 - Aug 22, 2019; Indianapolis, IN; United States
    Format: application/pdf
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  • 81
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    Seismic Recordings for SMARTIE1: Seismic Monitoring And Research of Wind Turbine Induced Emissions 1 (2019)
    GFZ Data Services
    Details
    Publication Date: 2023-02-08
    Description: Abstract
    Description: SMARTIE1 is a joint seismological experiment of the Karlsruhe Institute of Technology (KIT) and the Leipzig University. We installed in total 36 seismic stations as ring-like and profile-like measurements near to a single wind turbine (WT) at the Fraunhofer Institute for Chemical Technology (ICT) in Pfinztal, SW Germany, for 21 days. The main goals of this project are a better understanding of a single WT as a seismic source and the development of propagation models for the WT-induced seismic signals, depending on the geological properties. Waveform data are available from the GEOFON data centre, under network code X8 (under CC-BY 4.0 license according to GIPP-rules), and are embargoed until Jan 2020.
    Keywords: Broadband seismic waveforms ; Seismology ; temporary local seismic experiment ; induced seismic signals ; wind turbine ; Monitoring system ; Seismological stations ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS
    Type: Dataset , Seismic Network
    Format: ~1T
    Format: .mseed
    Format: XML
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  • 82
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    One year of seismic records of an array installed on a taiwanese ridge (2019)
    GFZ Data Services
    Details
    Publication Date: 2024-02-23
    Description: Abstract
    Description: A line of 6 broadband seismometers have been deployed across a ridge in the Hualien County (Eastern Taiwan). From March 2015 to June 2016 the network has been continuously recording waves incoming from the Taiwanese regional seismicity. During that period, more than 2000 earthquakes with magnitudes Ml〉3 and distant from less than 200km were recorded. The hill is well approximated by a triangular topography of 3600m in length by 900m in height. Waveform data are open and available from the GEOFON data centre, under network code 5K.
    Keywords: Broadband seismic waveforms ; Seismology ; temporary local seismic experiment ; Monitoring system ; EARTH SCIENCE 〉 SOLID EARTH ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS
    Type: Dataset , Seismic Network
    Format: ~240G
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  • 83
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    Multi-scale imaging of the Main Pamir Thrust faults within the framework of CaTeNA project – Climatic and Tectonic Natural Hazards in Central Asia (2019)
    GFZ Data Services
    Details
    Publication Date: 2024-02-23
    Description: Abstract
    Description: We propose to investigate the structure and evolution of the Main Pamir Thrust (MPT) with a high-density seismological array. The MPT, with its surface expression along the east-west trending Alai Valley, marks the northern boundary of the Pamir. The Alai Valley, separating the Pamir and the Tien Shan, constitutes the last vestige of a formerly continuous basin that linked the Tarim and the Tajik Basins. The MPT manifests itself as a place of high seismic activity with frequently occurred disastrous earthquakes. The array is about 50 km long, consisted of 90 three-component geophones (stations G?? and C??) and 10 Trillium-Compact seismometers (stations T??), and equipped with 100 CUBE dataloggers. We will construct a high-resolution receiver function profile to image the MPT and accurately locate the local earthquakes associated with the MPT. Funded by BMBF, within the framework of CaTeNA project – Climatic and Tectonic Natural Hazards in Central Asia. Waveform data are available from the GEOFON data centre, under network code 7A and are embargoed until Jan 2024.
    Keywords: Broadband seismic waveforms ; Seismology ; temporary local seismic experiment ; Monitoring system ; EARTH SCIENCE 〉 SOLID EARTH ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS
    Type: Dataset , Seismic Network
    Format: ~240G
    Format: .mseed
    Format: XML
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  • 84
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    Dataset of the 6G seismic network at Los Humeros, 2017-2018 (2019)
    GFZ Data Services
    Details
    Publication Date: 2024-02-23
    Description: Abstract
    Description: Extensive passive seismic monitoring was carried out between September 2017 and September 2018 over the Los Humeros geothermal field in Mexico. This experiment, in addition to several geophysical, geological, and geochemical surveys was conducted in the framework of the European H2020 and Mexican CONACyT-SENER project GEMex for a better understanding of the structures and behavior of the local geothermal system currently under exploitation, and for investigating future development areas. 25 broadband stations (22 Trillium C-120s and 3 Trillium C-20 PH) recording at 200 Hz, and 20 short period stations (Mark L-4C-3D) recording at 100 Hz comprised the network which is sub-divided into two sub-networks. An inner and denser (~1.6-2 km inter-station distance) pseudo-rhomboidal array (27 stations) was laid out to cover the producing zone and retrieve local seismicity mainly associated to injection and production operations, and to comply with beamforming of ambient noise and time reverse imaging techniques. An outer and sparser (~5 km minimum spacing) array was placed at around 30 km radius surrounding the inner network, and was mainly dedicated to larger scale imaging techniques, such as seismic ambient noise tomography, and regional earthquakes tomography. The GEMex project is supported by the European Union’s Horizon 2020 programme for Research and Innovation under grant agreement No 727550 and the Mexican Energy Sustainability Fund CONACYT-SENER, project 2015-04-68074. Waveform data are available from the GEOFON data centre, under network code 6G and are embargoed until Jan 2023.
    Keywords: Broadband seismic waveforms ; Seismology ; temporary local seismic experiment ; Monitoring system ; EARTH SCIENCE 〉 SOLID EARTH ; In Situ/Laboratory Instruments 〉 Magnetic/Motion Sensors 〉 Seismometers ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS ; In Situ Land-based Platforms 〉 GEOPHYSICAL STATIONS/NETWORKS 〉 SEISMOLOGICAL STATIONS
    Type: Dataset , Seismic Network
    Format: ~1T
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  • 85
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    Non-Double-Couple Component Analysis of Induced Microearthquakes in the Val d’Agri Basin (Italy) (2018)
    Details
    Publication Date: 2018-03-23
    Description: In recent years it has become accepted that earthquake source can attain significant Non-Double-Couple (NDC) components. Among the driving factors of deviation from normal double-couple (DC) mechanisms there is the opening/closing of fracture networks and the activation of pre-existing faults by pore fluid pressure perturbations. This observation makes the thorough analysis of source mechanism of key importance for the understanding of withdrawal/injection induced seismicity from geothermal and hydrocarbon reservoirs, as well as of water reservoir induced seismicity. In addition to the DC component, seismic moment tensor can be decomposed into isotropic (ISO) and compensated linear vector dipole (CLVD) components. In this study we performed a careful analysis of the seismic moment tensor of induced microseismicity recorded in the Val d'Agri (Southern Apennines, Italy) focusing our attention on the NDC component. The Val d'Agri is a Quaternary extensional basin that hosts the largest onshore European oil field and a water reservoir (Pertusillo Lake impoundment) characterized by severe seasonal level oscillations. Our input data-set includes swarm-type induced micro-seismicity recorded between 2005-2006 by a high-performance network and accurately localized by a reservoir-scale local earthquake tomography. We analyze two different seismicity clusters: (i) a swarm of 69 earthquakes with 0.3 ML 1.8 induced by a wastewater disposal well of the oilfield during the initial daily injection tests (10 days); (ii) 526 earthquakes with -0.2 ML 2.7 induced by seasonal volume changes of the artificial lake. We perform the seismic moment tensor inversion by using HybridMT code. After a very accurate signal-to-noise selection and hand-made picking of P-pulses, we obtain %DC, %ISO, %CLVD for each event. DC and NDC components are analyzed and compared with the spatio-temporal distribution of seismicity, the local stress field, the injection parameters and the water level in the impoundment. We find significant NDC components and abrupt temporal variations in the DC and ISO components that appear linked to the extremely variable parameters of the injection tests into the disposal well.
    Description: Published
    Description: New Orleans, LA
    Description: 2T. Sorgente Sismica
    Keywords: Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 86
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    Structural inheritance controlling active crustal deformation in the Val d’Agri area (southern Apennines, Italy): new insights from finite element modelling (2018)
    Details
    Publication Date: 2019-01-18
    Description: The availability of a large amount of surface geological data and subsurface information gathered by the oil industry, together with seismic and geodetic data, allowed us to define and analyse the active structures in the Val d'Agri area of the southern Apennines. Taking into account that the study of interseismic deformation can be significant to identify locked fault areas that can potentially slip, in this study we present 2D elastoplastic finite-element models to reproduce interseismic characteristics of the study area. This hosts the largest Europe's onshore oil field and is characterised by an active extensional tectonic regime, as inferred from earthquake focal mechanisms and fault slip data from late Quaternary structures. Based on high-quality seismic profiles tied with deep well logs, we constructed a detailed geological section across the study area. Outcropping units are dissected by numerous brittle structures that formed at various stages during the tectonic evolution of the Apennines, while the deep ones are dominated by deeply rooted major faults. The rheological behaviour has been constrained by the reconstruction of the thermal structure of the fold and thrust belt, using available information from the foreland Apulian Platform and from temperature data from a series of wells. Starting from the geological model, we reproduced interseismic deformation by means of finite-element numerical modelling, varying boundary conditions and unlocking different fault segments. Our numerical models provide new insights into the controversial and widely debated active tectonic setting of the Val d'Agri area, confirming the major role played by structural inheritance and reactivation processes. In fact, recent low-magnitude seismicity tends to illuminate fault segments consisting of pre-existing reverse faults reactivated as normal faults in the present-day stress field. These long-lived, mature fault systems occurring in the buried Apulian Platform carbonates (and underlying basement) represent major brittle structures that cumulated displacements of up to a few kilometres over geologic time. As a result of their reactivation within the late Quaternary extensional stress field, these long-lived crustal structures are capable of nucleating also moderate- to large-magnitude earthquakes. The decoupling between deep and shallow structural levels, and the different inherited structures affecting them, explain the apparent contrast between the subdued surface expression of active fault systems and the known occurrence of large magnitude seismic events in the study area, thus reconciling apparently contrasting geological and geophysical constraints.
    Description: Published
    Description: 111-114
    Description: 1T. Deformazione crostale attiva
    Description: N/A or not JCR
    Keywords: Active tectonics ; Fault reactivation ; Stress field ; Seismicity ; Extensional tectonics ; Seismology ; Tectonophysics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 87
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    Journal of Geophysics - Zeitschrift für Geophysik 48 (2018)
    Springer, Berlin
    In:  SUB Göttingen | 8 Z NAT 2148
    Details
    Publication Date: 2021-03-29
    Description: Dieser Band enthält 28 Artikel zu Themengebieten der Geophysik, veröffentlicht durch die Deutsche Geophysikalische Gesellschaft in dem Jahr 1980.
    Description: Inhaltsverzeichnis: Journal of Geophysics 48 〈html〉 〈body〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0012.pdf"〉The Analysis of Simultaneous Observations of Nighttime Pi Pulsations on an East-West Profile〈/a〉〈br〉 (Baranskiy, L. N., Troitskaya, V. A., Sterlikova, I. V., Gokhberg, M. B., Ivanov, N. A., Khartchenko, I. P., Münch, J. W., Wilhelm, K.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0013.pdf"〉Coordinated Magnetic Observations of Morning Sector Auroral Zone Currents With Triad and the Scandinavian Magnetometer Array: A Case Study〈/a〉〈br〉 (Sulzbacher, H., Baumjohann, W., Potemra, T. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0014.pdf"〉K – Ar Age Determinations on Tertiary Volcanic Rocks: V. Siebengebirge, Siebengebirge-Graben〈/a〉〈br〉 (Todt, W., Lippolt, H. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0015.pdf"〉The Geothermal Anomaly of Landau/Pfalz: An Attempt of Interpretation〈/a〉〈br〉 (Werner, D., Parini, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0016.pdf"〉Magnetic and Gravity Investigations of the Dead Sea Rift and Adjacent Areas in Northern Israel〈/a〉〈br〉 (Folkman, Y.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0017.pdf"〉Changes of Structure, Phase Composition and Electric Conductivity Under High-Temperature Oxidation of Titanomagnetites〈/a〉〈br〉 (Kropáček, V., Laštovičková, M.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0018.pdf"〉Maximum Velocity Amplitudes of 〈i〉P〈/i〉 and 〈i〉S〈/i〉 Waves From Filtered Broadband Records〈/a〉〈br〉 (Sitaram, M. V. D, Plešinger, A., Vaněk, J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0019.pdf"〉Comment on: On the Sources of the 12-Month Wave in the 〈i〉an〈/i〉 and 〈i〉as〈/i〉 Geomagnetic Activity Indices〈/a〉〈br〉 (Mayaud, P. N.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0020.pdf"〉Book Reviews〈/a〉〈br〉 (Schopper, J., Hartmann, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0021.pdf"〉A Late Cretaceous 〈sup〉40〈/sup〉Ar–〈sup〉39〈/sup〉Ar Age for the Lappajärvi Impact Crater, Finland〈/a〉〈br〉 (Jessberger, E. K., Reimold, W. U.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0022.pdf"〉Magnetic Properties of Swiss Flysch〈/a〉〈br〉 (Channell, J., Freeman, R., Heller, F.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0023.pdf"〉Source Parameters of Earthquakes From the Himalayan Region〈/a〉〈br〉 (Upadhyay, S. K., Duda, S. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0024.pdf"〉Teleseismic Evidence for Velocity Heterogeneity Beneath the Rhenish Massif〈/a〉〈br〉 (Raikes, S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0025.pdf"〉The Simulation Problem for Broad-Band Seismograms〈/a〉〈br〉 (Seidl, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0026.pdf"〉Load-Induced Stresses and Their Relation to the Initial Stress Field〈/a〉〈br〉 (Bock, G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0027.pdf"〉Ground-Based Observations of an Onset of Localized Field-Aligned Currents During Auroral Breakup Around Magnetic Midnight〈/a〉〈br〉 (Opgenoorth, H. J., Pellinen, R. J., Maurer, H., Küppers, F., Heikkila, W. J., Kaila, K. U., Tanskanen, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0028.pdf"〉Simultaneous Maxima of Geomagnetic Pulsations and Riometer Absorption on the Afternoon Side of the Auroral Zone〈/a〉〈br〉 (Novikov, Y., Kopytenko, Y., Raspopov, O., Bösinger, T., Kangas, J., Ranta, H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0029.pdf"〉Numerical Investigation of the Spectral Resolving Power of Burg's Maximum Entropy Method〈/a〉〈br〉 (Wenzel, F., Zürn, W.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0030.pdf"〉Errors in Matrix Element Expressions for the Reflectivity Method〈/a〉〈br〉 (Baumgardt, D.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0031.pdf"〉Magnetometer Array Observations of a Giant Pulsation Event〈/a〉〈br〉 (Glaßmeier, K.-H.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0032.pdf"〉Palaeomagnetic Secular Variation Curves Extending Back to 13,400 years B.P. Recorded by Sediments Deposited in Lac de Joux, Switzerland〈/a〉〈br〉 (Creer, K., Hogg, T. E., Readman, P. W., Reynaud, C.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0033.pdf"〉Anhysteretic Remanent Magnetization of Small Multidomain Fe〈sub〉3〈/sub〉O〈sub〉4〈/sub〉 Particles Dispersed in Various Concentrations in a Non Magnetic Matrix〈/a〉〈br〉 (Schmidbauer, E., Veitch, R. J.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0034.pdf"〉Stirred Remanent Magnetization: A Laboratory Analogue of Post-Depositional Realignment〈/a〉〈br〉 (Tucker, P.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0035.pdf"〉High Precision Measurement of the Frequency of Mode 〈sub〉O〈/sub〉S〈sub〉O〈/sub〉〈/a〉〈br〉 (Zürn, W., Knopoff, L., Rydelek, P. A.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0036.pdf"〉The Solution of Dynamic Problems of Elastic Wave Propagation in Inhomogeneous Media by a Combination of Partial Separation of Variables and Finite-Difference Methods〈/a〉〈br〉 (Alekseev, A. S., Mikhailenko, B. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0037.pdf"〉A Characteristic Method for Numerical Solution of the Inverse Kinematic Seismic Problems〈/a〉〈br〉 (Romanov, M. E., Alekseev, A. S.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0038.pdf"〉Geomagnetic Induction Studies in Scandinavia〈/a〉〈br〉 (Jones, A. G.)〈/li〉 〈li〉〈a href="https://gdz.sub.uni-goettingen.de/download/pdf/PPN1015067948_0048/LOG_0039.pdf"〉Comments on Polarization and Coherence〈/a〉〈br〉 (Samson, J. C.)〈/li〉 〈/body〉 〈/html〉
    Description: research
    Description: DFG, SUB Göttingen
    Keywords: 550 ; Geophysik ; Auroral Zone Physics ; Broad Band Seismograms ; Earth’s Crust ; Earth’s Mantle ; Electrical Conductivity of Rocks ; Electrical Conductivity of the Earth ; Electromagnetic lnduction in the Earth ; Free Oscillations ; Geochronology ; Geomagnetic Activity ; Geomagnetic Pulsations ; Geomagnetic Time Variations ; Geothermal Anomalies ; Gravity Anomalies ; Himalaya ; Impact Structures ; Induced Seismicity ; Inverse Seismic Problems ; Israel ; Magnetic Anomalies ; Maximum Entropy Method ; Palaeomagnetism ; Polarization Analysis ; Reflectivity Method ; Rheinisches Massiv ; Rock Magnetism ; Rock Physics ; Scandinavia ; Secular Variation ; Seismology ; Siebengebirge ; Stress Field ; Theoretical Seismograms ; FID-GEO-DE-7
    Language: English
    Type: anthology_digi
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  • 88
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    The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions (2018)
    John Wiley & Sons
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346.
    Description: We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3‐D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3‐D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision.
    Description: National Science Foundation Grant Numbers: PLR‐1142518, PLR‐1246712, PLR 1246151, PLR‐1246416, PLR‐1744883, PLR‐ 1744883
    Description: 2019-03-22
    Keywords: Seismology ; Crust and uppermost mantle ; Ambient noise tomography ; Antarctica ; Transantarctic Mountains ; Gamburtsev Mountains
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 89
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    Assessment of seabed seismic systems (2018)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-26
    Description: This project was initiated to accomplish the necessary research and documentation of existing seismic techniques and systems for the study of sediments and sedimentary structures in the oceans. In this respect , it is an 'inventory' of methods and techniques for looking at small-scale features or changes in structures lying from 10 to 1000 m beneath the sea floor. It attempts to assess the vertical and lateral resolution capabilities of existing and technically feasible seismic systems. Some of the questions posed are: how closely can we determine vertical variation such as sediment layer thickness and vertical variation with depth; also lateral coherence or its disruption by such agents as facies changes, thinning or thickening, slumping, faulting; the nature of the basement structure, its areal coherence, velocity structure and associated anomalies?
    Description: Prepared for the Sandia Laboratories under Contract 13-9944.
    Keywords: Seismology ; Ocean bottom
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 90
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    Microearthquake activity on the Orozco Fracture Zone : preliminary results from Project ROSE (2018)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-26
    Description: Also published as: Journal of Geophysical Research 86 (1981): 3783- 3790
    Description: We present preliminary hypocenter determinations for 52 earthquakes recorded by a large multiinstitutional network of ocean bottom seismometers and ocean bottom hydrophones in the Orozco Fracture Zone in the eastern Pacific during late February to mid-March 1979. The network was deployed as pan of the Rivera Ocean Seismic Experiment, also known as Project ROSE. The Orozco Fracture Zone is physiographically complex, and the pattern of microeanhquake hypocenters at least partly reflects this complexity. All of the well-located epicenters lie within the active transform fault segment of the fracture zone. About lialf of the recorded earthquakes were aligned along a narrow trough that extends eastward from the northern rise crest intersection in the approximate direction of the Cocos-Pacific relative plate motion; these events appear to be characterized by strike-slip faulting. The second major group of activity occurred in the central portion of the transform fault; the microearthquakes in this group do not display a preferred alignment parallel to the direction of spreading, and several are not obviously associated with distinct topographic features. Hypocentral depth was well resolved for many of the earthquakes reported here. Nominal depths range from 0 to 17 km below the seafloor.
    Description: Prepared for the Office of Naval Research under Contract N00014-79-C-0071; NR 083-004.
    Keywords: Natural disasters ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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    A geophysical survey within the Mesozoic magnitic anomaly sequence south of Bermuda (2018)
    Woods Hole Oceanographic Institution
    Details
    Publication Date: 2022-05-26
    Description: Also published as: Journal of Geophysical Research 84 (1979): 5487-5496
    Description: This geophysical survey of an approximate 1° square covers Mesozoic magnetic anomalies M0, M2, and M4 south of Bermuda. Bathymetry, magnetics, seismic reflection profiling, and seismic refraction data are presented. The isochron trend within the survey area at magnetic anomaly M4 time is 025°. Two left lateral fracture zones exist: the southern fracture zone has an offset of 〈10 km at M4 time and 33 km at M0 time. The northern fracture zone has an offset of 37 km at M4 time and 26 km at M0 time. These changes in offset are accounted for by asymmetric spreading, an 11° change in trend of anomaly M0 relative to M4, and by M0 time, growth of a small right lateral fracture zone. Seismic refraction data provide poor control on the shallow crustal structure but suggest the presence of significant lateral inhomogeneities within layer 2.
    Description: Prepared for the Office of Naval Research under Contract N00014-74-C-0262; NR 083-004.
    Keywords: Submarine geology ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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    Rupture evolution of the 2006 Java tsunami earthquake and the possible role of splay faults (2018)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in Tectonophysics 721 (2017): 143-150, doi:10.1016/j.tecto.2017.10.003.
    Description: The 2006 Mw 7.8 Java earthquake was a tsunami earthquake, exhibiting frequency-dependent seismic radiation along strike. High-frequency global back-projection results suggest two distinct rupture stages. The first stage lasted ~65 s with a rupture speed of ~1.2 km/s, while the second stage lasted from ~65 to 150 s with a rupture speed of ~2.7 km/s. High-frequency radiators resolved with back-projection during the second stage spatially correlate with splay fault traces mapped from residual free-air gravity anomalies. These splay faults also colocate with a major tsunami source associated with the earthquake inferred from tsunami first-crest back-propagation simulation. These correlations suggest that the splay faults may have been reactivated during the Java earthquake, as has been proposed for other tsunamigenic earthquakes, such as the 1944 Mw 8.1 Tonankai earthquake in the Nankai Trough.
    Description: W.F. is currently supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Weston Howland Jr. Postdoctoral Scholarship.
    Keywords: Earthquake ; Tsunami ; Back-projection ; Splay faults ; Java ; Seismology
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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    X-57 Maxwell Battery From Cell Level to System Level Design and Testing (2018)
    In:  CASI
    Details
    Publication Date: 2019-03-07
    Description: This presentation is on Electric and Hybrid Electric Propulsion: NASA's Approach, expectations, design and project requirements, and the motivation behind it.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN59208 , BEYOND LITHIUM ION XI; 24-26 Jul. 2018; Cleveland, OH; United States
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    Computational Investigation of a Boundary-Layer-Ingestion Propulsion System (2018)
    In:  CASI
    Details
    Publication Date: 2019-06-15
    Description: The present paper examines potential propulsive and aerodynamic benefits of integrating a Boundary-Layer Ingestion (BLI) propulsion system into the Common Research Model (CRM) geometry and the NASA Tetrahedral Unstructured Software System (TetrUSS). The Numerical Propulsion System Simulation (NPSS) environment is used to generate engine conditions for Computational Fluid Dynamics (CFD) analyses. Improvements to the BLI geometry are made using the Constrained Direct Iterative Surface Curvature (CDISC) design method. Potential benefits of the BLI system relating to cruise propulsive power are quantified using a power balance method, and a comparison to the baseline case is made. Iterations of the BLI geometric design are shown, and improvements between subsequent BLI designs are presented. Simulations are conducted for a cruise flight condition of Mach 0.85 at an altitude of 38,500 feet, with Reynolds number of 40 million based on mean aerodynamic chord and an angle of attack of 2 for all geometries. Results indicate an 8% reduction in engine power requirements at cruise for the BLI configuration compared to the baseline geometry. Small geometric alterations of the aft portion of the fuselage using CDISC has been shown to marginally increase the benefit from boundary-layer ingestion further, resulting in an 8.7% reduction in power requirements for cruise, as well as a drag reduction of approximately twelve counts over the baseline geometry.
    Keywords: Aircraft Propulsion and Power
    Type: NF1676L-25357 , Journal of Aircraft (ISSN 0021-8669) (e-ISSN 1533-3868); 55; 3; 1141-1153
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    Short-Haul Revitalization Study Final Report (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A feasibility study was performed for an advanced commercial short-haul aircraft to evaluate the potential for increased service for short-haul flights that operate out of regional and community airports. An analysis of potential origin-destination markets and trip distances resulted in a seat capacity selection of 48 passengers and a design range of 600 NM. A down-select of advanced technologies resulted in a hybrid-electric propulsion system being chosen as the primary enabling technology. A conceptual design of the advanced aircraft was developed, and a mission and sizing analysis was performed, comparing variants of the advanced aircraft with different levels of electrification. Fairly aggressive levels of electrification and battery specific energy are needed for the hybridelectric architecture to realize any benefit in terms of total energy cost for the 600 NM design mission. The development and operational costs were estimated for the advanced aircraft and compared to the baseline. This analysis demonstrated the negative effect of the cost to develop the hybrid-electric technology on the eventual operating cost. A market analysis was performed to determine possible passenger demand for the advanced shorthaul aircraft. According to the market analysis, there is potential demand for such an aircraft, but not necessarily in many of the smaller regional and community airports that were the intended beneficiaries of this new aircraft concept.
    Keywords: Aircraft Propulsion and Power
    Type: NF1676L-29966 , NASA/TM-2018-219833 , L-20927
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    Hollow-Wall Heat Shield for Fuel Injector Component (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A fuel injector component includes a body, an elongate void and a plurality of bores. The body has a first surface and a second surface. The elongate void is enclosed by the body and is integrally formed between portions of the body defining the first surface and the second surface. The plurality of bores extends into the second surface to intersect the elongate void. A process for making a fuel injector component includes building an injector component body having a void and a plurality of ports connected to the void using an additive manufacturing process that utilizes a powdered building material, and removing residual powdered building material from void through the plurality of ports.
    Keywords: Aircraft Propulsion and Power
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    Efficient, Low Pressure Ratio Propulsor for Gas Turbine Engines (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A gas turbine engine includes a core flow passage, a bypass flow passage, and a propulsor arranged at an inlet of the bypass flow passage and the core flow passage. The propulsor includes a row of propulsor blades. The row includes no more than 20 of the propulsor blades. The propulsor has a pressure ratio between about 1.2 and about 1.7 across the propulsor blades.
    Keywords: Aircraft Propulsion and Power
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    Non-Axisymmetric Fixed or Variable Fan Nozzle for Boundary Layer Ingestion Propulsion (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A fan section for an engine has a fan which rotates about an axis, the fan has an inlet for ingesting ambient air, and a non-axisymmetric nozzle for providing the fan with non-uniform back pressure.
    Keywords: Aircraft Propulsion and Power
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    Meander-Like Shape Optimization of the Stator-Rotor Platform Cavity (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Recent progress in additive manufacturing has enabled opportunities to explore novel stator rim geometries which can be implemented to improve cooling strategies in turbomachinery. This paper presents a simplified stationary geometry optimization strategy to produce enhanced stator-rotor cavity sealing and highlights main driving mechanisms.The stator and rotor rims were designed using a design strategy based on inspiration from the meandering of rivers. A minimum thickness of 2 millimeters was maintained throughout the cavity to ensure a practical implementation. The computational domain comprised of the stator outlet, hub disk leakage cavity, and rotor platform was meshed using NUMECA Int. package, Hexpress. The numerical analysis required 3D Unsteady Reynolds Average Navier-Stokes to replicate vorticial structures using Ansys Fluent. The operating conditions were representative of engine-like conditions, exploring a wide range of mass flow ratios from 1 to 3 percent. The optimization yielded designs that provide 30 percent reduction in rear platform temperature while minimizing coolant mass flow. The applicability of the design was compared against 3D sector in both stationary and in rotation.
    Keywords: Aircraft Propulsion and Power
    Type: ASME GT2018-77167 , GRC-E-DAA-TN55691 , ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition (GT2018); Jun 11, 2018 - Jun 15, 2018; Oslo; Norway
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    X-57 Maxwell Battery from Cell Level to System Level Design and Testing (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The X-57 Maxwell flight demonstrator aircraft is an experimental aircraft designed to demonstrate radically improved aircraft efficiency with a 3.5 times aero-propulsive efficiency gain at a "high-speed cruise" flight condition for comparable general aviation aircraft. These gains are enabled by integrating the design of a new, optimized wing and a new electric propulsion system. There are 14 propulsors in all: 12 high lift motor that are only active during takeoff and climb, and 2 larger motors positioned on the wingtips that operate over the entire mission. The innovative electric propulsion system will have as its primary power a Li-ion battery system. Integrating a battery system into this innovative design poses unique challenges that require careful design considerations across the system. The presentation will cover a breakout of X-57 battery specifications, battery design and lessons learned when designing a high voltage battery system to power electrified aircrafts.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN59043 , GRC-E-DAA-TN59208 , AIAA/IEEE Electric Aircraft Technologies Symposium (EATS); Jul 12, 2018 - Jul 13, 2018; Cincinnati, OH; United States|BEYOND LITHIUM ION XI; Jul 24, 2018 - Jul 26, 2018; Cleveland, OH; United States
    Format: application/pdf
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