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  • 1985-1989  (4,498)
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  • 1
    Call number: G 9084 ; AWI G7-91-0409 ; M 91.0560
    In: Physical, chemical, and earth sciences research report
    Type of Medium: Monograph available for loan
    Pages: XI, 400 S. : Ill., graph. Darst.
    ISBN: 0471921858
    Series Statement: Physical, chemical, and earth sciences research report 8
    Language: English
    Note: Table of Contents: The Dahlem Konferenzen / S. Bernhard. - Introduction / H. Oeschger and C. C. Langway, Jr. - Aerosol transport from sources to ice sheets / G. E. Shaw. - Mechanisms of wet and dry deposition of atmospheric contaminants to snow surfaces / C. I. Davidson. - The transformation of snow to ice and the occlusion of gases / J. Schwander. - Environmental records in alpine glaciers / D. Wagenbach. - GROUP REPORT. - How do glaciers record environmental processes and preserve information? / J. W. C. White, P. Brimblecombe, C. Brühl, C. I. Davidson, R. J. Delmas, G. Gravenhorst, K. O. Münnich, S. A. Penkett, U. Schotterer, J. Schwander, G. E. Shaw, D. Wagenbach. - Dating by physical and chemical seasonal variations and reference horizons / C. U. Hammer. - Dating of ice by radioactive isotopes / B. R. Stauffer. - Dating by ice flow modeling: a useful tool or an exercise in applied mathematics? / N. Reeh. - Physical property reference horizons / H. Shoji and C. C. Langway, Jr. - GROUP REPORT. - How can an ice core chronology be established? / W. F. Budd, J. T. Andrews, R. C. Finkel, E. L. Fireman, W. Graf, C. U. Hammer, J. Jouzel, D. P. Raynaud, N. Reeh, H. Shoji, B. R. Stauffer, J. Weertman. - Temporal variations of trace gases in ice cores / M. A. K. Khalil and R. A. Rasmussen. - Trace metals and organic compounds in ice cores / D. A. Peel. - The ionic deposits in polar ice cores / H. B. Clausen and C. C. Langway, Jr. - The impact of observed changes in atmospheric composition on global atmospheric chemistry and climate / P. J. Crutzen and C. Brühl. - GROUP REPORT. - What anthropogenic impacts are recorded in glaciers? / G. I. Pearman, R. J. Charlson, T. Class, H. B. Clausen, P. J. Crutzen, T. Hughes, D. A. Peel, K. A. Rahn, J. Rudolph, U. Siegenthaler, D. S. Zardini. - Past environmental long-term records from the Arctic / W. Dansgaard and H. Oeschger. - Long-term changes in the concentrations of major chemical compounds (soluble and insoluble) along deep ice cores / R. J. Delmas and M. Legrand. - Long-term environmental records from Antarctic ice cores / C. Lorius, G. Raisbeck, J. Jouzel, and D. Raynoud. - Studies of polar ice: insights for atmospheric chemistry / M. B. McElroy. - GROUP REPORT. - Long-term ice core records and global environmental changes / A. D. Hecht, W. Dansgaard, J. A. Eddy, S. J. Johnsen, M. A. Lange, C. C. Langway, Jr., C. Lorius, M. B. McElroy, H. Oeschger, G. Raisbeck, P. Schlosser. - List of participants with fields of research. - Subject index. - Author index.
    Location: Upper compact magazine
    Location: AWI Reading room
    Branch Library: GFZ Library
    Branch Library: AWI Library
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Wiley
    Call number: PIK M 311-92-1107
    Type of Medium: Monograph available for loan
    Pages: 307 S.
    ISBN: 0471615536
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 3
    Call number: ZSP-201-86/11
    In: CRREL Report, 86-11
    Description / Table of Contents: This initial study of the ice-covered Tanana River, near Fairbanks, Alaska, attempted to 1) establish field methods for systematic and repetitive quantitative analyses of an ice-covered river's regime, 2) evaluate the instruments and equipment for sampling, and 3) obtain the initial data of a long-term study of ice cover effects on the morphology, hydraulics and sediment transport of a braided river. A methodology was established, and detailed measurements and samplings, including profiling by geophysical techniques, were conducted along cross sections of the river. A small, portable rotary drill rig equipped with a 356-mm (14-in.) ice auger was used to cut large diameter holes in the ice cover for through-the-ice measurements. Portable heat sources and a heated shelter were required to continuously thaw and dry equipment for the repetitive measurements. Measurements included ice cover thickness, water level, water depth, temperature, flow velocity, suspended load and bed load, frazil ice distribution and bed material composition. Remotely gathered data included apparent resistivity and subsurface radar profiling. The various techniques, sampling gear and problems encountered during use in the subfreezing cold are described in detail in this report.
    Type of Medium: Series available for loan
    Pages: v, 49 Seiten , Illustrationen
    Series Statement: CRREL Report 86-11
    Language: English
    Note: CONTENTS Abstract Preface Introduction Study objectives and field locale Study site Equipment Vehicles Drilling equipment Sampling equipment Geophysical equipment Shelter and icing control Surveying equipment Miscellaneous equipment Field techniques and methodology Logistics Drilling procedures Data collection Geophysical analyses Experiences summary Morphology, transport and hydraulic data Mid-winter physical characteristics Hydraulic characteristics Sediment transport Late winter physical characteristics Seasonal morphology Geophysical data interpretation Spatial morphology Frazil ice characteristics Discussion and conclusions Recommendations Equipment Research Literature cited
    Location: AWI Archive
    Branch Library: AWI Library
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  • 4
    Call number: ZSP-201-87/17
    In: CRREL Report, 87-17
    Description / Table of Contents: The ability to map frazil ice deposits and water channels beneath an ice-covered river in central Alaska using the magnetic induction conductivity (MI) technique has been assessed. The study was performed during the first week of March of 1986 on the Tanana River near Fairbanks and employed a commercially available instrument operating at a fixed frequency with a fixed antenna (coil) spacing and orientation. Comparisons of the MI data with theoretical models based upon physical data measured along three cross sections of the river demonstrate the sensitivity of the MI technique to frazil ice deposits. The conductivity generally derived for the frazil ice deposits encountered is very low (approx. .00063 s/m) when compared with the measured value for water (approx. 0.011 S/m), and is similar to the calculated values for gravel and sandy gravel bed sediments. In all three cross sections, maxima in the apparent conductivity profiles correlated with frazil ice deposits. Difficulties, possibly due to adverse effects of cold weather upon instrument calibration, affected the quantitative performance of the instrument on one cross section, although the interpretation of the data (locations of open channels vs frazil deposits) was qualitatively unaffected.
    Type of Medium: Series available for loan
    Pages: iii, 17 Seiten , Illustrationen
    Series Statement: CRREL Report 87-17
    Language: English
    Note: CONTENTS Abstract Preface Introduction Magnetic induction conductivity method Site description and survey methods Cross section field data and modeling results X6 X3A X4 Conclusions and recommendations Literature cited Appendix A: Discussion of errors Appendix B: Modeling data
    Location: AWI Archive
    Branch Library: AWI Library
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  • 5
    Publication Date: 2019-07-13
    Description: An investigation was performed to examine the feasibility of an escape tube as an aid in crew bailout from the Shuttle Orbiter at subsonic speeds. The deployable escape tube extended from the main side hatch downwards. Wind-tunnel tests with scaled models demonstrated that successful bailout was possible when the tube exit was at least 1 foot below the wing leading edge. The aerodynamics of the Orbiter were only slightly degraded with the tube deployed. Several tube designs were investigated, the most promising of which was an inflatable elastic/fabric 'Airmat' configuration. Loads on the tube were within capability of current airmat technology.
    Keywords: SPACE TRANSPORTATION
    Type: AIAA PAPER 88-2136 , AIAA Flight Test Conference; May 18, 1988 - May 20, 1988; San Diego, CA; United States
    Format: text
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  • 6
    Publication Date: 1989-12-15
    Description: The plasma science experiment on Voyager 2 made observations of the plasma environment in Neptune's magnetosphere and in the surrounding solar wind. Because of the large tilt of the magnetic dipole and fortuitous timing, Voyager entered Neptune's magnetosphere through the cusp region, the first cusp observations at an outer planet. Thus the transition from the magnetosheath to the magnetosphere observed by Voyager 2 was not sharp but rather appeared as a gradual decrease in plasma density and temperature. The maximum plasma density observed in the magnetosphere is inferred to be 1.4 per cubic centimeter (the exact value depends on the composition), the smallest observed by Voyager in any magnetosphere. The plasma has at least two components; light ions (mass, 1 to 5) and heavy ions (mass, 10 to 40), but more precise species identification is not yet available. Most of the plasma is concentrated in a plasma sheet or plasma torus and near closest approach to the planet. A likely source of the heavy ions is Triton's atmosphere or ionosphere, whereas the light ions probably escape from Neptune. The large tilt of Neptune's magnetic dipole produces a dynamic magnetosphere that changes configuration every 16 hours as the planet rotates.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Belcher, J W -- Bridge, H S -- Bagenal, F -- Coppi, B -- Divers, O -- Eviatar, A -- Gordon, G S Jr -- Lazarus, A J -- McNutt, R L Jr -- Ogilvie, K W -- Richardson, J D -- Siscoe, G L -- Sittler, E C Jr -- Steinberg, J T -- Sullivan, J D -- Szabo, A -- Villanueva, L -- Vasyliunas, V M -- Zhang, M -- New York, N.Y. -- Science. 1989 Dec 15;246(4936):1478-83.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17756003" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2017-10-02
    Description: Store separation and store carriage drag studies were conducted. A primary purpose is to develop new experimental methods to evaluate near field effects of store separation and levels of store carriage drag associated with a variety of carriage techniques for different store shapes and arrangements. Flow field measurements consisting of surface pressure distributions and vapor screen photographs are used to analyze the variations of the store separation characteristics with cavity geometry. Store carriage drag measurements representative of tangent, semi-submerged, and internal carriage installations are presented and discussed. Results are included from both fully metric models and models with only metric segments (metric pallets) and the relative merits of the two are discussed. Carriage drag measurements for store installations on an aircraft parent body are compared both with prediction methods and with installations on a generic parent body.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AGARD, Stability and Control of Tactical Missile Systems; 9 p
    Format: text
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  • 8
    Publication Date: 2019-06-28
    Description: Results of an experimental and analytical study of the postbuckling behavior of selected graphite-epoxy cylindrical panels loaded in axial compression are presented. The postbuckling response and failure characteristics of the panels are described. The postbuckling response of each specimen is typical of axially-compressed cylindrical shells and curved panels in that a severe reduction in load occurs at buckling. Failure of all panels initiated near regions with severe local bending gradients. Analytical results from a nonlinear general shell finite element analysis computer code correlate well with typical experimental results up to buckling. Measured initial geometric imperfections were included in the postbuckling analysis. Analytically-determined stress distributions in the postbuckling response were used with failure criteria to identify the load level and the location of first-ply failure.
    Keywords: COMPOSITE MATERIALS
    Type: AIAA PAPER 86-0881
    Format: text
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  • 9
    Publication Date: 2019-06-28
    Description: The effects of simulated heavy rain on the aerodynamic characteristics of a NACA 64-210 airfoil section equipped with high-lift devices were investigated in the NASA Langley 14- by 22-Foot Subsonic Tunnel. The experiment was part of an on-going NASA program to determine the effect of heavy rain on airplane performance, and was directed at providing insight into scaling laws for subscale model testing of rain effects. The model used in the investigation had a chord of 2.5 feet, a span of 8.0 feet, and was mounted on the tunnel centerline between two large endplates. A water spray distribution system was located 10 chord lengths upstream of the model. The sensitivity of test results to partial-span coverage of the model in the simulated rain environment as compared to full-span coverage was also investigated. The lift and drag data obtained for the high-lift configuration show excellent repeatability of results compared to the previous data. Results obtained for various spray concentrations and tunnel speeds showed significant losses in maximum lift capability, a decrease in the angle of attack for maximum lift, and an increase in drag as the stimulated rain rate was increased. The test results also indicated that the data were not strongly affected by surface tension effects for the high-lift configuration.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-0260
    Format: text
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  • 10
    Publication Date: 2019-06-28
    Description: An acoustics test using an aeroelastically scaled rotor was conducted to examine the effectiveness of higher harmonic blade pitch control for the reduction of impulsive blade-vortex interaction (BVI) noise. A four-bladed, 110 in. diameter, articulated rotor model was tested in a heavy gas (Freon-12) medium in Langley's Transonic Dynamics Tunnel. Noise and vibration measurements were made for a range of matched flight conditions, where prescribed (open-loop) higher harmonic pitch was superimposed on the normal (baseline) collective and cyclic trim pitch. For the inflow-microphone noise measurements, advantage was taken of the reverberance in the hard walled tunnel by using a sound power determination approach. Initial findings from on-line data processing for three of the test microphones are reported for a 4/rev (4P) collective pitch control for a range of input amplitudes and phases. By comparing these results to corresponding baseline (no control) conditions, significant noise reductions (4 to 5 dB) were found for low-speed descent conditions, where helicopter BVI noise is most intense. For other rotor flight conditions, the overall noise was found to increase. All cases show increased vibration levels.
    Keywords: ACOUSTICS
    Type: NASA-TM-101624 , AVSCOM-TM-89-B-005 , NAS 1.15:101624 , AD-A233833
    Format: application/pdf
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