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  • 1
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    The Parameters of Simple Excess Semiconductors (1951)
    Institute of Physics
    Details
    Publication Date: 1951-05-01
    Print ISSN: 0370-1298
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    On the possibility of Earth reentry simulation of shallow angle Jupiter entry (1972)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Possible Earth reentry simulation of shallow-angle (3 to 30 deg) Jupiter entry was investigated in terms of four parameters of the bow shock layer ahead of a blunt vehicle: peak (equilibrium) temperature, peak pressure, peak inward radiative flux, and time-integrated radiative flux. It is shown that simulation ranging from fair to good can be achieved. Reentry is easiest (lowest Earth reentry speed) at steep Earth reentry, in the Earth entry speed range of 15 to 22 km/sec, for both the Jupiter nominal and cool atmospheres. Increased Earth speed is required, generally, for increasing Jupiter entry angle, and for increasing temperature, radiative flux, time-integrated flux and pressure, in that order.
    Keywords: SPACE VEHICLES
    Type: JPL Quart. Tech. Rev., Vol. 1, No. 4; p 19-29
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Venus Sample Return - A Hot Topic (2000)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Within th Solar System, Venus presents a set of unique challenges to obtaining samples and returning them to Earth.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 2000 IEEE Aerospace Conference; Big Sky, MT; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A Light-Weight Inflatable Hypersonic Drab Device for Venus Entry (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: AAS/AIAA Astrodynamics Specialist Conference; Girdwood, AK; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Application of the V-Gamma map to vehicle breakup analysis (2003)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Type: Flight Mechanics Symposium; Greenbelt, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Measurement of density and temperature in a hypersonic turbulent boundary layer using the electron beam fluorescence technique (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Mean density and temperature fluctuations were measured across the turbulent, cooled-wall boundary layer in a continuous hypersonic (Mach 9.4) wind tunnel in air, using the nitrogen fluorescence excited by a 50 kV electron beam. Data were taken at three values of the tunnel stagnation pressure, the corresponding free stream densities being equivalent to 1.2, 4.0, and 7.4 torr at room temperature, and the boundary layer thicknesses about 4.0, 4.5, and 6.0 inches. The mean temperature and density profiles were similar to those previously determined in the same facility by conventional probes (static and pitot pressure, total temperature). A static pressure variation of about 50% across the boundary layer was found, the shape of the variation changing somewhat for the three stagnation pressure levels. The quadrupole model for rotational temperature spectra gave closer agreement with the free stream isentropic level (approximately 44 K) than the dipole model.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-119169 , USC-53-4514-8152
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Improved electron-beam probe for hypersonic flows (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Probe uses differentially-pumped drift tube to connect high and low pressure regions thereby allowing higher gas densities to be studied. System uses higher beam voltages (50 kV) and currents (1 mA delivered to gas), and extends boundary layer penetration up to 15.2 cm, and test duration to one hour.
    Keywords: MECHANICS
    Type: NPO-13793 , NASA Tech Briefs (ISSN 0145-319X); 3; 2; P. 261
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Thin film gauge (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A thin film gauge for use in measuring distributed convective heat transfer rates occurring along given surfaces, is described. The gauge is particularly suited to measuring test surfaces in the air stream of a wind tunnel. The gauge is characterized by a plurality of painted platinum leads extend across the surface of a substrate; a pair of leads on the surface is adapted to deliver an electric current at a constant amperage through a selected thermally active area. Leads are also coupled at opposite sides of the thermally active area for detecting induced voltage drops occurring in the area so that the active length of the gauge is defined between voltage output leads. Changes in heat transfer to the thermally active area are isolated and determined by detecting induces changes in voltage drop.
    Keywords: GENERAL
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Spacecraft microbial burden reduction due to atmospheric entry heating - Jupiter. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An effort has been underway at Jet Propulsion Laboratory to develop the tools necessary to predict temperature histories for a typical spacecraft during inadvertent entry. In order that the results have general applicability, parametric analyses are performed. The thermal response of the spacecraft components and debris resulting from disintegration is determined. The temperature histories of small particles and composite materials, such as thermal blankets and an antenna, are given special attention. Guidelines are given to indicate the types of components and debris most likely to contain viable organisms, which could contaminate the lower layers of the Jovian atmosphere.
    Keywords: BIOTECHNOLOGY
    Type: Plenary Meeting on The near ultraviolet spectrum of early type stars obtained with S 59; May 23, 1973 - Jun 05, 1973; Konstanz; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Spacecraft microbial burden reduction due to atmospheric entry heating: Jupiter (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Planetary quarantine analyses performed for recent unmanned Mars and Venus missions assumed that the probability of contamination by a spacecraft given accidental impact was equivalent to one. However, in the case of the gaseous outer planets, the heat generated during the inadvertent entry of a spacecraft into the planetary atmosphere might be sufficient to cause significant microbial burden reduction. This could affect navigation strategy by reducing the necessity for biasing the aim point away from the planets. An effort has been underway to develop the tools necessary to predict temperature histories for a typical spacecraft during inadvertent entry. In order that the results have general applicability, parametric analyses were performed. The thermal response of the spacecraft components and debris resulting from disintegration was determined. The temperature histories of small particles and composite materials, such as thermal blankets and an antenna, were given special attention. Guidelines are given to indicate the types of components and debris most likely to contain viable organisms, which could contaminate the lower layers of the Jovian atmosphere (approximately one atmosphere of pressure).
    Keywords: BIOSCIENCES
    Type: NASA-CR-132072 , JPL-PAPER-L.7.8 , Joint Open Meeting of the Panel on Planetary Quarantine and Working Group 5; May 23, 1973 - Jun 06, 1973; Konstanz; Germany
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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