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  • Other Sources  (13)
  • ELECTRONICS AND ELECTRICAL ENGINEERING  (5)
  • PHYSICS, PLASMA  (5)
  • CHEMISTRY AND MATERIALS (GENERAL)  (3)
  • Chemistry
  • 1
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    Measurements of plasma energy density and conductivity from 3 to 120 kbar. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Plasma energy density, conductivity and temperature measurements at various pressures
    Keywords: PHYSICS, PLASMA
    Type: JOURNAL OF APPLIED PHYSICS
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    NASA TECHNICAL REPORTS
  • 2
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    Plasma density measurements at 100 kilobars of pressure. (1966)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Measurement of plasma density generated by underwater explosions, noting modes of electrical discharge and shock front role
    Keywords: PHYSICS, PLASMA
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    NASA TECHNICAL REPORTS
  • 3
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    Secondary electron emission from a charged dielectric (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Charges on the surface of fluorinated-ethylene-propylene affect its secondary electron emission coefficient. Measurements with impact energies exceeding that energy which causes peak emission have been made in regions where the local electric field produced by the surface charge is normal to the surface and in regions where it is oblique. The surface of the 6-mm wide specimen was charged to either 6 or 10 kV. Because the impinging primary beam was deflected by the charged specimen, numerical modeling was used to predict the beam's impact energy E, impact angle theta, and the impact point. The formula predicts the coefficient in the region of normal field up to 60 deg although E(0) depends upon the electric field and also on the history of the specimen. Near the edges where the field is oblique, the measured coefficient departs significantly from what the formula predicts.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Electrical Insulation (ISSN 0018-9367); EI-20; 485-491
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    NASA TECHNICAL REPORTS
  • 4
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    Charge distributions near metal-dielectric interfaces before and after dielectric surface flashover (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A technique was developed for measuring surface charge distribution near interfaces without placing any measuring apparatus near the face of the samples. The results of measurements which were made on FEP Teflon and Kapton dielectrics, before and after are given flashover, with various types of interfaces. Also given are data showing mean time between flashovers for various configurations exposed to a variety of environmental conditions. Several charge transfer mechanisms are considered as a means by which stable charge distributions may be maintained near interfaces.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Lewis Res. Center Proc. of the Spacecraft Charging-Technol. Conf.; p 503-717
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    NASA TECHNICAL REPORTS
  • 5
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    Measurements of plasma energy density and conductivity from 3 to 120 kilobars (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Plasma energy density and conductivity measured at pressures from 3 to 120 kilobars
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-78481
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    NASA TECHNICAL REPORTS
  • 6
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    Chemical vapor deposition coatings for oxidation protection of titanium alloys (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results of an experimental investigation of the oxidation protection afforded to Ti-14Al-21Nb and Ti-14Al-23Nb-2V titanium aluminides and Ti-17Mo-3Al-3Nb titanium alloy by aluminum-boron-silicon and boron-silicon coatings are presented. These coatings are applied by a combination of physical vapor deposition (PVD) and chemical vapor deposition (CVD) processes. The former is for the application of aluminum, and the latter is for codeposition of boron and silicon. Coating thickness is in the range of 2 to 7 microns, and coating weights are 0.6 to 2.0 mg/sq cm. Oxidation testing was performed in air at temperatures to 1255 K in both static and hypersonic flow environments. The degree of oxidation protection provided by the coatings is determined from weight change measurements made during the testing and post test compositional analyses. Temperature-dependent total normal emittance data are also presented for four coating/substrate combinations. Both types of coatings provided excellent oxidation protection for the exposure conditions of this investigation. Total normal emittances were greater than 0.80 in all cases.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: In: Damage and oxidation protection in high temperature composites. Vol. 1; Proceedings of the Symposium, 112th ASME Winter Annual Meeting, Atlanta, GA, Dec. 1-6, 1991 (A93-53937 23-24); p. 1-8.
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  • 7
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    The effectiveness of multi-layer insulation as meteoroid and orbital debris shielding (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents the results of a study of the penetration resistance of Type I Multi-Layer Insulation (MLI) to meteoroid and orbital debris particles. Hypervelocity impact tests on MLI were performed and the collected data was compared to data and empirical equations developed for aluminum. The study results indicate that MLI can be an effective shield from meteoroids and orbital debris for short duration missions and for non-critical elements. However, long missions which require high levels of protection cannot rely on MLI without a thorough investigation of the overall system reliability.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: AIAA PAPER 92-1460
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Plasma Measurements from 3 to 120 Kilobars of Pressure Final Report (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Plasma measurements of pressure, temperature, resistivity, and energy density
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-75334
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  • 9
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    Measurement and interpretation of plasma properties to 100 kilobars of pressure (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Plasma thermodynamic properties under hydrostatic pressure and explosively increased hydrostatic pressure
    Keywords: PHYSICS, PLASMA
    Type: NASA-CR-446
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  • 10
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    Non-catalytic coatings for hypersonic vehicle applications (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: CVD coatings of boron-oxygen-silicon and aluminum-boron-oxygen and silicon compositions were applied to alpha 2 and gamma titanium-aluminide alloys, and tested under simulated earth reentry conditions to evaluate oxidation protection, recombination effifiency and total emittance under cyclic exposures between temperatures of 300 and 1255 K. The degree of oxidation protection afforded to the alloys was evaluated from the amount of specimen weight gain after a 100 hour exposure to air at atmospheric pressure and at a temperature of 1255 K. Data are presented for two types of coatings, a monolithic and a multilayer, which have recombination efficiencies from 0.005 to 0.020 after ten one-half hour long simulated reentry cycles. Total normal emittance was 0.80 or greater and weight gain was less than 10 g/sq m both coating types. Compositional and morphological changes resulting from the exposures are discussed in relation to time-dependent variations in recombination efficiency.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: AIAA PAPER 90-1742
    Format: text
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