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  • Other Sources  (4)
  • NUCLEAR ENGINEERING  (2)
  • BIOSCIENCES  (1)
  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
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  • 1
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    Benchmark gas core critical experiment. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A critical experiment with spherical symmetry has been conducted on the gas core nuclear reactor concept. The nonspherical perturbations in the experiment were evaluated experimentally and produce corrections to the observed eigenvalue of approximately 1% delta k. The reactor consisted of a low density, central uranium hexafluoride gaseous core, surrounded by an annulus of void or low density hydrocarbon, which in turn was surrounded with a 97-cm-thick heavy water reflector.
    Keywords: NUCLEAR ENGINEERING
    Type: Nuclear Science and Engineering; 47; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Flowing gas, non-nuclear experiments on the gas core reactor (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Variations in cavity wall and injection configurations of the gas core reactor were aimed at establishing flow patterns that give a maximum of the nuclear criticality eigenvalue. Correlation with the nuclear effect was made using multigroup diffusion theory normalized by previous benchmark critical experiments. Air was used to simulate the hydrogen propellant in the flow tests, and smoked air, argon, or Freon to simulate the central nuclear fuel gas. Tests were run both in the down-firing and upfiring directions. Results showed that acceptable flow patterns with volume fraction for the simulated nuclear fuel gas and high flow rate ratios of propellant to fuel can be obtained. Using a point injector for the fuel, good flow patterns are obtained by directing the outer gas at high velocity long the cavity wall, using louvered injection schemes. Recirculation patterns were needed to stabilize the heavy central gas when different gases are used.
    Keywords: NUCLEAR ENGINEERING
    Type: NASA-CR-121191 , ANCR-1118
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Investigation of Spacecraft Materials that Support Microorganism Growth (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microorganism growth supporting or biocidal properties of spacecraft paint coatings
    Keywords: BIOSCIENCES
    Type: NASA-CR-113798
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Use of column V alkyls in organometallic vapor phase epitaxy (OMVPE) (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of the column V-trialkyls trimethylarsenic (TMAs) and trimethylantimony (TMSb) for the organometallic vapor phase epitaxy (OM-VPE) of III-V compound semiconductors is reviewed. A general discussion of the interaction chemistry of common Group III and Group V reactants is presented. The practical application of TMSb and TMAs for OM-VPE is demonstrated using the growth of GaSb, GaAs(1-y)Sb(y), Al(x)Ga(1-x)Sb, and Ga(1-x)In(x)As as examples.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Semiconductor growth technology;; Jan 26, 1982 - Jan 27, 1982; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
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