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  • 1975-1979  (3)
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  • 1
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    Unknown
    Rare accessory uraninite in a Sierran granite (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: One grain of uraninite was found in a single thin-section of Sierran granite. Electron and ion microprobe analysis were used to determine the composition. Since the U-Pb age calculated for the uraninite does not differ greatly from the K-Ar age of the unit in which it occurs, it is suggested that the mineral is primary and not reworked from a preexisting rock. No uraninite has been detected in heavy mineral concentrates from other rocks of the local area.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: American Mineralogist; 62; 1977
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Nitrogen-sulfur compounds in stratospheric aerosols (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Two forms of nitrosyl sulfuric acid (NOHSO4 and NOHS2O7) have been tentatively identified in stratospheric aerosols. The first of these can be formed either directly from gas reactions of NO2 with SO2 or by gas-particle interactions between NO2 and H2SO4. The second product may form when SO3 is involved. Estimates based on these reactions suggest that the maximum quantity of NO that might be absorbed in stratospheric aerosols could vary from one-third to twice the amount of NO in the surrounding air. If these reactions occur in the stratosphere, then a mechanism exists for removing nitrogen oxides from that region by aerosol particle fallout. This process may typify another natural means that helps cleanse the lower stratosphere of excessive pollutants.
    Keywords: ENVIRONMENT POLLUTION
    Type: Journal of Geophysical Research; 83; Dec. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Programs for calculating cell parameters in electron and X-ray diffraction (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Ten programs for calculating cell parameters from single crystal electron diffraction patterns are presented. Most of the programs, written for use with a programmable desk calculator, are also applicable to X-ray diffraction work. The programs can be used to calculate d-spacings from electron diffraction plate measurements, and to determine cell data (including interplanar angles and zone angles) for all crystal systems. A program for rhombohedral-hexagonal conversions and one for matching crystal data from standards with apparent crystal parameters found in diffraction patterns are included. Because they allow rapid determination of data not present in X-ray listings or elsewhere in the literature, the programs facilitate identification of unknowns.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TP-1529 , A-7761
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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