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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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    NASA TECHNICAL REPORTS
  • 8
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    Petrogenesis of light and dark portions of the Leighton gas-rich chondritic breccia (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Individual dark fractions of the Leighton chondritic breccia are all enriched in volatile/mobile trace elements. Concentrations of the most highly volatile/mobile elements correlate with degree of equilibration, as expressed by compositional variability for silicates. Individual light clasts in the same meteorite are equilibrated and generally volatile-poor, except for enrichments in Rb and Cs. These alkali elements may have been redistributed by feldspar formation during metamorphism. Enrichments of other trace elements in dark portions may have been caused by mobilization during metamorphism in the parent body interior and deposition in the cooler surface layers. An alternative model involves accretional mixing of a diverse compositional population of primitive H group materials to form dark materials. Subsequent integration of light and dark materials was accomplished by impacts into a regolith.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Mechanical properties of Al-mica particulate composite material (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Cast aluminum alloy mica particle composites of varying mica content were tested in tension, compression, and impact. With 2.2 percent mica (size range 40-120 microns) the tensile and compression strengths of aluminum alloy decreased by 56 and 22 percent, respectively. The corresponding decreases in percent elongation and percent reduction are 49 and 39 percent. Previous work shows that despite this decrease in strength the composite with 2.5 percent mica and having an UTS of 15 kg/sq mm and compression strength of 28 kg/sq mm performs well as a bearing material under severe running conditions. The differences in strength characteristics of cast aluminum-mica particle composites between tension and compression suggests that, as in cast iron, expansion of voids at the matrix particle interface may be the guiding mechanism of the deformation. SEM studies show that on the tensile fractured specimen surface, there are large voids at the particle matrix interface.
    Keywords: COMPOSITE MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
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