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  • SPACE BIOLOGY  (2)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
  • 1
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    Vulcanism, mercury-sensitized photo-reactions and abiogenetic synthesis - A theoretical treatment (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Attention is called to the photodynamic and thermodynamic properties of Periodic Group IIb elements, most notably Hg, as they relate to ultra-violet sensitization in organic chemical reactions. The energy levels of 6 1P1 and 6 3P1 resonance states and the high vapor pressure (greater than 0.001 mm) of the metal at temperatures as low as 293 K bring Hg with the range of bond dissociation energies in most organic molecules and many inorganics. These capabilities considered together with recent evidence for Hg emission as a regular part of volcanic and geothermal processes provide the basis for a proposal that Hg-sensitized ultraviolet photo-reactions may have played a significant part in abiogenetic organic synthesis on the primative earth.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life; 7; Aug. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Attitude determination techniques for Nimbus 6 and Nimbus G (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Techniques for measuring attitude deviations in the Nimbus 6 and Nimbus G 3-axis stabilized, zero-momentum, earth observation satellites are presented. The on-orbit telemetered data include scanner roll and pitch error signals, an illuminated DSAS which can read the azimuth and elevation of the sunline when the spacecraft is not in the umbra, the signal from the single gyro in the RMP, and the momenta of the reaction wheels. Mathematical methods for interpreting the measured data are described with attention to filter equations, especially the Kalman filter because of its ability to eliminate high frequency noise.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astrodynamics Specialist Conference; Sept. 7-9, 1977; Jackson Hole, WY; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Volcanism and soil mercury on Mars - Consequences for terrestrial microorganisms (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An earth-Mars depletion formula proposed by Anders and Owen for volatiles is used to calculate a range of putative Hg levels for Martian volcanic soils based upon analyzed samples from Hawaii. The range is about 50-150 microgram per kg. When applied either in conventional or special media (e.g., basalt powder), these levels of Hg are effective inhibitors of the growth of earth microorganisms. Taken together with other hostile chemical and physical factors, volcanic toxicants would appear to provide a further deterrent to the accidental establishment of terrestrial microbiota on Mars.
    Keywords: SPACE BIOLOGY
    Type: Plenary Meeting; May 29, 1978 - Jun 10, 1978; Innsbruck; Austria
    Format: text
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    NASA TECHNICAL REPORTS
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