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  • Other Sources  (3)
  • 1990-1994  (3)
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  • 1
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    Unknown
    Cold plasma processing of local planetary ores for oxygen and metallurgically important metals (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The utilization of a cold plasma in chlorination processing is described. Essential equipment and instruments were received, the experimental apparatus assembled and tested, and preliminary experiments conducted. The results of the latter lend support to the original hypothesis: a cold plasma can both significantly enhance and bias chemical reactions. In two separate experiments, a cold plasma was used to reduce TiCl4 vapor and chlorinate ilmenite. The latter, reacted in an argon-chlorine plasma, yielded oxygen. The former experiment reveals that chlorine can be recovered as HCl vapor from metal chlorides in a hydrogen plasma. Furthermore, the success of the hydrogen experiments has lead to an analysis of the feasibility of direct hydrogen reduction of metal oxides in a cold plasma. That process would produce water vapor and numerous metal by-products.
    Keywords: PLASMA PHYSICS
    Type: NASA Space Engineering Research Center for Utilization of Local Planetary Resources; 5 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Cold plasma processing of local planetary ores for oxygen and metallurgically important metals (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The utilization of a cold or nonequilibrium plasma in chlorination processing is discussed. Titanium dioxide (TiO2) was successfully chlorinated at temperatures between 700 and 900 C without the aid of carbon. In addition to these initial experiments, a technique was developed for determining the temperature of a specimen in a plasma. Development of that technique has required evaluating the emissivity of TiO2, ZrO2, and FeOTiO2 and analyzing the specimen temperature in a plasma as a function of both power absorbed by the plasma and the pressure of the plasma. The mass spectrometer was also calibrated with TiCl4 and CCl4 vapor.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA Space Engineering Research Center for Utilization of Local Planetary Resources; 16 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Review of the probabilistic failure analysis methodology and other probabilistic approaches for application in aerospace structural design (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Probabilistic structural analyses and design methods are steadily gaining acceptance within the aerospace industry. The safety factor approach to design has long been the industry standard, and it is believed by many to be overly conservative and thus, costly. A probabilistic approach to design may offer substantial cost savings. This report summarizes several probabilistic approaches: the probabilistic failure analysis (PFA) methodology developed by Jet Propulsion Laboratory, fast probability integration (FPI) methods, the NESSUS finite element code, and response surface methods. Example problems are provided to help identify the advantages and disadvantages of each method.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TP-3434 , M-734 , NAS 1.60:3434
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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