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  • Other Sources  (5)
  • 2020-2024
  • 1980-1984  (5)
  • 1850-1859
  • 1980  (5)
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  • 2020-2024
  • 1980-1984  (5)
  • 1850-1859
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  • 1
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    Microbial mobilization of calcium and magnesium in waterlogged soils (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Environmental Quality; 9; Jan
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The isotopic composition of neon and magnesium in the low energy cosmic rays (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The ratios Ne-22/Ne-20 and Mg-26/Mg-24 were measured in galactic cosmic rays by the IMP-7 satellite in the 60 to 230 MeV/nucleon range. The neon cosmic ray source ratio Ne-22/Ne-20 is about 0.38, which is much larger than the current solar system relationship; the Mg data agrees with the solar system isotopic ratio of 0.14 at the cosmic ray source. The Ne and Mg source ratios are explained by supernova models, and become a new constraint which should be satisfied by any model of cosmic ray origin.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
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    NASA TECHNICAL REPORTS
  • 3
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    Carbon, nitrogen and oxygen isotopes in the low energy galactic cosmic rays (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The isotopes of C, N, and O in the galactic cosmic rays were measured in the 45-106 Mev/nucleon range with data collected during 1973-77 by the cosmic-ray telescope onboard the IMP-7 spacecraft. The ratios of (N-15)/N, (C-13)/C, and ((O-18)/O agreed with previous measurements. Cosmic ray propagation and solar modulation indicate that the measured N isotopic ratio is in agreement with a source ratio of (N-14)/O = 0.03, which is much lower than the solar system abundance ratio.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
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    NASA TECHNICAL REPORTS
  • 4
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    The energy dependence of the ratios of secondary to primary elements in the cosmic radiation (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The secondary to primary ratios B/C, N/O and (Sc-Mn)/Fe in the galactic cosmic rays have been measured in the overall energy interval 30-180 MeV/n with the University of Chicago cosmic ray telescope on board the satellite IMP-8 during the period 1974-1978. These results, together with the values of the same ratios measured at higher energies, have been compared to the results of cosmic ray propagation calculations using different pathlength distributions (PLD) and different levels of solar modulation, in order to select a single set of parameters consistent with all the measured ratios.
    Keywords: SPACE RADIATION
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
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    NASA TECHNICAL REPORTS
  • 5
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    The elemental abundances of hydrogen through nickel in the low energy cosmic rays (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The relative abundances of the elements H through Ni in the galactic cosmic rays have been measured in the energy range 70-280 MeV/nucleon with the University of Chicago cosmic ray telescope on board the satellite IMP-8 from January 1973 to September 1978. Cosmic ray source abundances have been derived by extrapolating the measured composition back to the source. A key factor in the propagation calculation is the use of a pathlength distribution and a solar modulation level shown to be consistent with the secondary to primary ratios and their energy dependence below about 1 GeV/n.
    Keywords: ASTROPHYSICS
    Type: International Cosmic Ray Conference; Aug 06, 1979 - Aug 18, 1979; Kyoto; Japan
    Format: text
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    NASA TECHNICAL REPORTS
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