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  • AERODYNAMICS  (2)
  • LUNAR AND PLANETARY EXPLORATION  (2)
  • Binding Sites
  • ELECTRONIC COMPONENTS AND CIRCUITS
  • INSTRUMENTATION AND PHOTOGRAPHY
  • 1990-1994  (4)
  • 1965-1969
  • 1992  (4)
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  • 1990-1994  (4)
  • 1965-1969
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  • 1
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    The age of the meteorite recovery surfaces of Roosevelt County, New Mexico, USA (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We have obtained minimum age estimates for the sand units underlying the two largest meteorite deflation surfaces in Roosevelt County, New Mexico, USA, using thermoluminescence dating techniques. The dates obtained ranged from 53.5 (+/- 5.4) to 95.2 (+/- 9.5) ka, and must be considered lower limits for the terrestrial ages of the meteorites found within these specific deflation surfaces. These ages greatly exceed previous measurements from adjacent meteorite-producing deflation basins. We find that Roosevelt County meteorites are probably terrestrial contemporaries of the meteorites found at most accumulation zones in Antarctica. The apparent high meteorite accumulation rate reported for Roosevelt County by Zolensky et al. (1990) is incorrect, as it used an age of 16 ka for all Roosevelt County recovery surfaces. We conclude that the extreme variability of terrestrial ages of the Roosevelt County deflation surfaces effectively precludes their use for calculations of the meteorite accumulation rate at the Earth's surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics (ISSN 0026-1114); 27; 4; p. 460-462.
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    NASA TECHNICAL REPORTS
  • 2
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    Wind-tunnel based definition of the AFE aerothermodynamic environment (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Aeroassist Flight Experiment (AFE), scheduled to be performed in 1994, will serve as a precursor for aeroassisted space transfer vehicles (ASTV's) and is representative of entry concepts being considered for missions to Mars. Rationale for the AFE is reviewed briefly as are the various experiments carried aboard the vehicle. The approach used to determine hypersonic aerodynamic and aerothermodynamic characteristics over a wide range of simulation parameters in ground-based facilities is presented. Facilities, instrumentation and test procedures employed in the establishment of the data base are discussed. Measurements illustrating the effects of hypersonic simulation parameters, particularly normal-shock density ratio (an important parameter for hypersonic blunt bodies), and attitude on aerodynamic and aerothermodynamic characteristics are presented, and predictions from computational fluid dynamic (CFD) computer codes are compared with measurement.
    Keywords: AERODYNAMICS
    Type: In: Advances in hypersonics. Vol. 1 - Defining the hypersonic environment (A94-10776 01-02); p. 109-181.
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    NASA TECHNICAL REPORTS
  • 3
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    Finite wing aerodynamics with simulated glaze ice (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The effect of a simulated glaze ice accretion on the aerodynamic performance of a three-dimensional wing is studied experimentally. The model used for these tests was a semi-span wing of effective aspect ratio five, mounted from the sidewall of the UIUC subsonic wind tunnel. The model has an NACA 0012 airfoil section on a rectangular, untwisted planform with interchangeable leading edges to allow for testing both the baseline and the iced wing geometry. A three-component sidewall balance was used to measure lift, drag and pitching moment on the clean and iced model. A four-beam two-color fiberoptic laser Doppler velocimeter (LDV) was used to map the flowfield along several spanwise cuts on the model. Preliminary results from LDV scans, which will be the bulk of this paper, are presented following the force balance measurement results. Initial comparison of LDV surveys compare favorably with inviscid theory results and 2D split hot-film measurements near the model surface.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 92-0414
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  • 4
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    The sodium and potassium atmosphere of the moon and its interaction with the surface (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Results are presented from Apollo satellite observations (from May 1988 to July 1991) of sodium and potassium in the lunar atmosphere. The observations of Na and K show a wide range of scale heights, single-component temperatures, and surface number densities, while the column abundances remain within a factor of 3. The observed trends can be explained using a model of competing release mechanisms with different dependences on solar zenith angle and resulting two-component atmospheres. The theory is applied to the budget of atomic oxygen.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 96; 27-42
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