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  • Other Sources  (66)
  • 2020-2023  (1)
  • 2015-2019  (56)
  • 1980-1984  (9)
  • 1930-1934
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  • 1
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    Comparison of the effects between single and multiple scattering on coda waves for local earthquakes (1983)
    In:  Bull. Seism. Soc. Am., Warszawa, Inst. Electrical & Electronics Engineers, vol. 73, no. 19, pp. 377-389, pp. 2000, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1983
    Keywords: Scattering ; Inhomogeneity ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Effects of multiple scattering on coda waves in three-dimensional medium (1983)
    In:  Pageoph, Warszawa, Inst. Electrical & Electronics Engineers, vol. 121, no. 19, pp. 3-16, pp. 2000, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1983
    Keywords: Scattering ; Inhomogeneity
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Investigation of the three-dimensional Alaskan lithospheric structure (1982)
    prel. rep. of the Geophys. Inst., Univ. of Alaska
    In:  Fairbanks, AK 99701, prel. rep. of the Geophys. Inst., Univ. of Alaska, vol. 17, pp. 225, (ISBN 0-19-851393-3)
    Details
    Publication Date: 1982
    Keywords: Seismics (controlled source seismology) ; Seismology ; Lithosphere ; Anisotropy ; Inhomogeneity ; Scattering
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Studies of the ionization states of solar and galactic cosmic ray heavy nuclei (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Enhancement of abundances of heavy nuclei (e.g., Mg, Si, and Fe) at low energies relative to solar photospheric abundances and anomalously high abundances of iron relative to oxygen nuclei at low energies were recently discovered in solar energetic particles studied at low energy. These phenomena are not understood at present. The proposed experiment is designed to study the recently discovered anomalous component of low energy galactic cosmic ray ions of C, N, O, Ne, and Ca to Fe of energy 5- to 10-million electron volts per atomic mass unit in regard to their ionization states, composition, and intensity, and to study the ionization states of heavy elements from oxygen to iron in energetic solar particles emitted during flare events. The same detector system will serve for both studies, with the second objective being given priority if there are any solar particle events during the mission.
    Keywords: SPACE TRANSPORTATION
    Type: NASA. Marshall Space Flight Center Spacelab Mission 3 Expt. Descriptions; p 35-37
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Chemical characteristics and origin of H chondrite regolith breccias (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Petrologic data and contents of Ag, Bi, Cd, Co, Cs, Ga, In, Rb, Se, Te, Tl and Zn-trace elements spanning the volatility/mobility range-in light and dark portions of H chondrite regolith breccias and L chondrite fragmental breccias are reported. The chemical/petrologic characteristics of H chondrite regolith breccias differ from those of nonbrecciated chondrites or fragmental breccias. Petrologic characteristics and at least some trace element contents of H chondrite regolith breccias reflect primary processes; contents of the most volatile/mobile elements may reflect either primary or secondary processing, possibly within layered H chondrite parent object(s). Chemical/petrologic differences existed in different regions of the parent(s). Regoligh formation and gardening and meteoroid compaction were not so severe as to alter compositions markedly.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 47; Feb. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Thermal metamorphism of primitive meteorites. XI - The enstatite meteorites: Origin and evolution of a parent body (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The neutron activation data for Ag, As, Bi, Cd, Co, Cs, Cu, Ga, In, Rb, Se, Te, Tl, and Zn were obtained in samples of Abee heated to 1000-1400 C at low pressures. In addition, these elements were reported in nine enstatite achondrites and in the silicate part of the Mt. Egerton stony-iron. The data show trace element losses above 1000 C by diffusion-controlled processes with apparent activation energies of 8 to 55 kcal/mol; these data together with abundances of aubrites, Mt. Egerton, and E4-6 chondrites, and isotopic results link all enstatite meteorites to a common parent body. The data also indicate that aubrites and the Mt. Egerton material reflect fractional crystallization of a magma produced from enstatite chondrite-like parent material (E6) and the late introduction of chalcophiles and mobile elements transported by an FeS-Fe eutectic from an E4-6 region undergoing open-system metamorphism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 44; Dec. 198
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    NASA TECHNICAL REPORTS
  • 7
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    Trace element contents of selected Antarctic meteorites. I - Weathering effects and ALH A77005, A77257, A77278 and A 77299 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data is examined for volatile/mobile Ag, As, Au, Bi, Cd, Co, Cs, Cu, Ga, In, Rb, Sb, Se, Te, Tl and Zn in exterior and/or interior samples of four Antarctic meteorites from the Allan Hills (ALH): A77005 (unique achondrite); A77257 (ureilite); A77278 (L3); A77299 (H3). Exterior samples reflect contamination and/or leaching by weathering but trace element (ppm-ppt) contents in interior samples seem reasonable for representatives of these rare meteoritic types. The A77005 achondrite is shown to be related to shergottites; other samples extend compositional ranges previously known for their groups or types. With suitable precautions, Antarctic meteorite finds yield trace element data as reliable as those obtained from previously known falls.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Zeitschrift fuer Naturforschung; vol. 35
    Format: text
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  • 8
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    A Quantum-Assisted Algorithm for Sampling Applications in Machine Learning (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: An increase in the efficiency of sampling from Boltzmann distributions would have a significant impact in deep learning and other machine learning applications. Recently, quantum annealers have been proposed as a potential candidate to speed up this task, but several limitations still bar these state-of-the-art technologies from being used effectively. One of the main limitations is that, while the device may indeed sample from a Boltzmann-like distribution, quantum dynamical arguments suggests it will do so with an instance-dependent effective temperature, different from the physical temperature of the device. Unless this unknown temperature can be unveiled, it might not be possible to effectively use a quantum annealer for Boltzmann sampling. In this talk, we present a strategy to overcome this challenge with a simple effective-temperature estimation algorithm. We provide a systematic study assessing the impact of the effective temperatures in the learning of a kind of restricted Boltzmann machine embedded on quantum hardware, which can serve as a building block for deep learning architectures. We also provide a comparison to k-step contrastive divergence (CD-k) with k up to 100. Although assuming a suitable fixed effective temperature also allows to outperform one step contrastive divergence (CD-1), only when using an instance-dependent effective temperature we find a performance close to that of CD-100 for the case studied here. We discuss generalizations of the algorithm to other more expressive generative models, beyond restricted Boltzmann machines.
    Keywords: Physics (General)
    Type: ARC-E-DAA-TN35141 , Workshop on Theory and Practice of Adiabatic Quantum Computers and Quantum Simulation; Aug 22, 2016 - Aug 26, 2016; Trieste; Italy
    Format: application/pdf
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  • 9
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    Nanoradian Ground-Based Astrometry, Optical Navigation, and Artificial Reference Stars (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-20
    Description: Spacecraft carrying optical communication lasers can be treated as artificial stars, whose relative astrometry to Gaia reference stars provides spacecraft positions in the plane-of-sky for optical navigation. To be comparable to current Deep Space Network delta-Differential One-way Ranging measurements, thus sufficient for navigation, nanoradian optical astrometry is required. Here we describe our error budget, techniques for achieving nanoradian level ground-base astrometry, and preliminary results from a 1 m telescope. We discuss also how these spacecraft may serve as artificial reference stars for adaptive optics, high precision astrometry to detect exoplanets, and tying reference frames defined by radio and optical measurements.
    Keywords: Lunar and Planetary Science and Exploration; Lasers and Masers
    Type: JPL-CL-16-3153 , SPIE Astronomical Telescopes + Instrumentation 2016; Jun 26, 2016 - Jul 01, 2016; Edinburgh, Scotland; United Kingdom
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    NASA TECHNICAL REPORTS
  • 10
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    Hurricane Imaging Radiometer (HIRAD) Wind Speed Retrievals and Assessment Using Dropsondes (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The Hurricane Imaging Radiometer (HIRAD) is an experimental C-band passive microwave radiometer designed to map the horizontal structure of surface wind speed fields in hurricanes. New data processing and customized retrieval approaches were developed after the 2015 Tropical Cyclone Intensity (TCI) experiment, which featured flights over Hurricanes Patricia, Joaquin, Marty, and the remnants of Tropical Storm Erika. These new approaches produced maps of surface wind speed that looked more realistic than those from previous campaigns. Dropsondes from the High Definition Sounding System (HDSS) that was flown with HIRAD on a WB-57 high altitude aircraft in TCI were used to assess the quality of the HIRAD wind speed retrievals. The root mean square difference between HIRAD-retrieved surface wind speeds and dropsonde-estimated surface wind speeds was 6.0 meters per second. The largest differences between HIRAD and dropsonde winds were from data points where storm motion during dropsonde descent compromised the validity of the comparisons. Accounting for this and for uncertainty in the dropsonde measurements themselves, we estimate the root mean square error for the HIRAD retrievals as around 4.7 meters per second. Prior to the 2015 TCI experiment, HIRAD had previously flown on the WB-57 for missions across Hurricanes Gonzalo (2014), Earl (2010), and Karl (2010). Configuration of the instrument was not identical to the 2015 flights, but the methods devised after the 2015 flights may be applied to that previous data in an attempt to improve retrievals from those cases.
    Keywords: Meteorology and Climatology
    Type: MSFC-E-DAA-TN48243 , Conference on Hurricanes and Tropical Meteorology; Apr 16, 2018 - Apr 20, 2018; Ponte Vedra, FL; United States
    Format: application/pdf
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