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  • Lunar and Planetary Science and Exploration  (3)
  • THERMODYNAMICS AND COMBUSTION  (1)
  • 2000-2004  (3)
  • 1970-1974  (1)
  • 1920-1924
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  • 2000-2004  (3)
  • 1970-1974  (1)
  • 1920-1924
  • 2015-2019  (3)
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  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: Looking at EAP Intervention Techniques; Vancouver, British Columbia; Canada
    Format: text
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  • 2
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    In:  Other Sources
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: Looking at EAP Intervention Techniques; Vancouver, British Columbia; Canada
    Format: text
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  • 3
    Publication Date: 2019-06-27
    Description: Propellant gases emitted by attitude control systems such as SPARCS (Solar Pointing Aerobee Rocket Control System) and possible interference with experiments aboard the payloads are discussed. The optical properties of seven actual and potential gases emitted by propellant systems (CF4, N2H4, NH3, N2, CO2, Ar, and He) are presented. A compilation of absorption coefficients from 1 Angstrom to 50 microns and a summary of fluorescent spectra and efficiencies are provided. Since Freon-14 (CF4) is of primary importance to SPARCS, an experimental search for the fluorescent spectrum of CF4 was performed by exciting the gas with 920 Angstrom UV photons. The result was compared with an electron impact induced spectrum of CF4, and conclusions drawn about the nature of the radiating species. A detailed study of the CF4 flow fields and plume densities for typical SPARCS controlled payloads was made using gas dynamic codes which included the effects of vehicle shading and condensation. The importance of the optical properties of CF4 plumes was investigated and it is concluded that absorption is negligible but fluoresence may be significant in some cases.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-CR-114508
    Format: application/pdf
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  • 4
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    In:  Other Sources
    Publication Date: 2019-07-10
    Description: Evidence for dissected duricrust was identified in high resolution MOC images. Analysis of all available images was used to map the global distribution of this terrain. It is apparently restricted to two latitude bands: 30-60 deg. N and 30-60 deg. S.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXI; LPI-Contrib-1000
    Format: text
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