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  • 1
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    Effects of a soft surface layer on near-fault static and dynamic displacements (2003)
    In:  Geophysical Journal International, Tokyo Univ., Geophys. Inst., Fac. of Science, vol. 154, no. 2, pp. 441-462, pp. L07312, (ISSN 0343-5164)
    Details
    Publication Date: 2003
    Keywords: Dislocation ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Three dimensional ; discrete ; wavenumber ; method ; Wave propagation ; Okada ; Kennett ; Kerry ; Luco ; Aspel ; R/T ; matrix ; GJI
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Cosmic-ray-produced iron 60 in odessa meteorite. (1965)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Cosmic ray produced iron 60 measurement in Odessa meteorite by counting daughter radionuclide cobalt 60, noting dating application
    Keywords: SPACE SCIENCES
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    NASA TECHNICAL REPORTS
  • 3
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    Half-life of Si-32 from tandem-accelerator mass spectrometry (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A newly developed mass-spectrometry technique employing a tandem Van de Graaff accelerator together with a special beam-transport system and heavy-ion detector has been used to determine the half-life of Si-32. The result obtained, 108 plus or minus 18 yr, disagrees with the accepted value of 330 plus or minus 40 yr. The implications of the new half-life of Si-32, which is used for dating studies, are discussed.
    Keywords: NUCLEAR AND HIGH-ENERGY PHYSICS
    Type: Physical Review Letters; 45; Aug. 25
    Format: text
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  • 4
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    Xe-129 - Xe-128 and Ar-40 - Ar-39 chronology of two Antarctic enstatite meteorites (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Xe-129 - Xe-128 and Ar-40 - Ar-39 analyses has been performed on two Antarctic enstatite meteorites, the chondrite Y-691 and the aubrite (enstatite achondrite) ALH-78113. Both meteorites have complex Ar-40 - Ar-39 release patterns to which no unambiguous age assignment is possible. Both give apparently satisfactory Xe-129 - Xe-128 correlations corresponding to unusual ages. The I-Xe age of the chondrite Y-691 is 16 Ma after Bjurbole, not unusual for chondrites in general but 10 Ma later than previously known ages for enstatite chondrites. The I-Xe age of the aubrite ALH-78113 is 210 Ma after Bjurbole, the latest age (rather than a limit) so far observed by the I-Xe technique, but this age assignment must be considered tentative because of the possibility that it is significantly influenced by terrestrial I contamination.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: National Institute of Polar Research, Memoirs, Special Issue (ISSN 0386-0744); 30 D; 275-291
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  • 5
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    The atmospheric inventory of Xenon and noble cases in shales The plastic bag experiment (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A novel trapped gas analysis protocol is applied to five shales in which the samples are sealed in air to eliminate the possibility of gas loss in the preanalysis laboratory vacuum exposure of a conventional protocol. The test is aimed at a determination concerning the hypothesis that atmospheric noble gases occur in the same proportion as planetary gases in meteorites, and that the factor-of-23 deficiency of air Xe relative to planetary Xe is made up by Xe stored in shales or other sedimentary rocks. The results obtained do not support the shale hypothesis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 4597-461
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  • 6
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    Measurements of I-129 in meteorites and lunar rock by tandem accelerator mass spectrometry (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Precise measurements of the half-life of I-129 in three different meteorites and one lunar surface rock are reported. The meteorite source of I-129 was produced by cosmic ray secondary neutron reactions on Te, while the source in lunar materials in spallation on barium and rare earth elements. The Abee, Allende, and Dhajala meteorites were examined, together with the lunar rock 14310. Details of the process used to extract the iodine are provided. The Abee and Allende samples exhibited a production of 0.5 atom/min per gm of Te from the (n,2n) reaction and 0.05 atom/min/gm for the (n,gamma) reaction. The I-129 is concluded to be a viable tool for long-lived cosmogenic nuclide studies. Further work to extend the data to include the constancy of the cosmic ray flux, the meteorite bombardment history, and the cosmic exposure age dating by means of the I-129 and Xe-129 method is indicated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 305; 611
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  • 7
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    Adsorption and excess fission Xe - Adsorption of Xe on vacuum crushed minerals (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is hypothesized that adsorption is not likely to provide a sufficiently precise mechanism for the concentration of excess fission Xe in the entire lunar regolith, in view of laboratory analogs of the lunar soil and calculations of the residence times of noble gases in the present day regolith. Lunar cold trap and episodic degassing models are difficult to reconcile, however, with the generality of excess fission Xe in all gas-rich highland breccias. It is concluded that the high Xe concentration in such highland breccias is not the result of Xe adsorption prior to the trapping of this component.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
    Format: text
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  • 8
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    Fluidic Proportional Thruster System Final Report (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluidic proportional thrust control system with vortex valves
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Type: NASA-CR-73304 , S-69-1079
    Format: application/pdf
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  • 9
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    The Origin of Noble Gas Isotopic Heterogeneity in Icelandic Basalts (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Two models for generation of heterogeneous He, Ne and Ar isotopic ratios in Icelandic basalts are evaluated using a mixing model and the observed noble gas elemental ratios in Icelandic basalts,Ocean island Basalt (OIBs) and Mid-Ocean Ridge Basalt (MORBs). Additional information is contained in the original extended abstract.
    Keywords: Geophysics
    Type: Eleventh Annual V. M. Goldschmidt Conference; LPI-Contrib-1088
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Radiation-Driven Flame Spread Over Thermally-Thick Fuels in Quiescent Microgravity Environments (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Microgravity experiments on flame spread over thermally thick fuels were conducted using foam fuels to obtain low density and thermal conductivity, and thus large spread rate (Sf) compared to dense fuels such as PMMA. This scheme enabled meaningful results to lie obtained even in 2.2 second drop tower experiments. It was found that, in contrast conventional understanding; steady spread can occur over thick fuels in quiescent microgravity environments, especially when a radiatively active diluent gas such as CO2 is employed. This is proposed to be due to radiative transfer from the flame to the fuel surface. Additionally, the transition from thermally thick to thermally thin behavior with decreasing bed thickness is demonstrated.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: AIAA Paper 2001-0467 , 39th AIAA Aerospace Sciences Meeting and Exhibit; Jan 08, 2001 - Jan 11, 2001; Reno, NV; United States
    Format: application/pdf
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