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  • Other Sources  (3)
  • ASTRONAUTICS (GENERAL)  (1)
  • BIOTECHNOLOGY  (1)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (1)
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  • Other Sources  (3)
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  • 1
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    A note on the biological activity of the noble gas compound xenon trioxide. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Comparison of xenon trioxide for toxicity in the few common oxidants using three bioassays. On a molar basis XeO3 and HOCl were similar, but XeO3 was less active than expected when comparisons were based on normality.
    Keywords: BIOTECHNOLOGY
    Type: Space Life Sciences; 3; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of the passive stabilization of the long duration exposure facility (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The nominal Long Duration Exposure Facility (LDEF) configurations and the anticipated orbit parameters are presented. A linear steady state analysis was performed using these parameters. The effects of orbit eccentricity, solar pressure, aerodynamic pressure, magnetic dipole, and the magnetically anchored rate damper were evaluated to determine the configuration sensitivity to variations in these parameters. The worst case conditions for steady state errors were identified, and the performance capability calculated. Garber instability bounds were evaluated for the range of configuration and damping coefficients under consideration. The transient damping capabilities of the damper were examined, and the time constant as a function of damping coefficient and spacecraft moment of inertia determined. The capture capabilities of the damper were calculated, and the results combined with steady state, transient, and Garber instability analyses to select damper design parameters.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-159023 , DOC-78SD4218
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Attitude determination techniques for Nimbus 6 and Nimbus G (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Techniques for measuring attitude deviations in the Nimbus 6 and Nimbus G 3-axis stabilized, zero-momentum, earth observation satellites are presented. The on-orbit telemetered data include scanner roll and pitch error signals, an illuminated DSAS which can read the azimuth and elevation of the sunline when the spacecraft is not in the umbra, the signal from the single gyro in the RMP, and the momenta of the reaction wheels. Mathematical methods for interpreting the measured data are described with attention to filter equations, especially the Kalman filter because of its ability to eliminate high frequency noise.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Astrodynamics Specialist Conference; Sept. 7-9, 1977; Jackson Hole, WY; US
    Format: text
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    NASA TECHNICAL REPORTS
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