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  • 1
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    Unknown
    Unfurlable, continuous-surface reflector concept (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Various concepts for large, deployable reflectors were developed and some have flown. In each case the surface material was either a continuous mesh of some sort or an assembly of rigid, continuous-surface facets or petals. Performance issues arise in each case. For mesh, reflectance diminishes with increasing frequency. For rigid sections, seams and relative positioning of the segments have to be dealt with. These two issues prompted the evolution of the concept of an unfurlable, continuous-surface reflector. The concept is described and what is learnt is presented, what is suspected will be learned, and also questions raised yet to be addressed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA, Langley Research Center, Earth Science Geostationary Platform Technology; p 129-136
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Gyroscopic stimulation of the semicircular canals during sensory deprivation. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A static object revolving at a constant velocity is stationary with respect to that environment. When the object is rotated outside the plane of spin, a gyroscopic or cross-coupled acceleration is produced orthogonal to the two planes of rotation. In this situation, a man feels himself moving in a direction other than that which his visual or proprioceptive sensors perceive. The conflict in spatial orientation is the cross-coupled acceleration imposed on the semicircular canals. This perceptual conflict and the thresholds involved were studied by partial isolation of the physiological stimuli through sensory deprivation. Subjects weighted to neutral buoyancy were submerged in 94 F water in the dark. The subjects were then rotated while being revolved about a displaced axis. Thresholds for detection of angular acceleration were higher than those reported in the literature for detection of acceleration of a single plane. This discrepancy may be attributable to the length of time the stimuli are imposed to each of the canals and the cupular response periods.
    Keywords: BIOTECHNOLOGY
    Type: Aerospace Medicine; 42; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Mechanization and vehicle integration of the space research centrifuge. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Space research centrifuge for measuring zero g and g sensitive time dependent phenomena, discussing radius, mechanization and integration into space vehicle
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: ANNUAL MEETING; May 13, 1968 - May 15, 1968; DEDHAM, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Configuring the orbital centrifuge systems for space shuttle compatibility (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Space shuttle orbital centrifuge systems configuration, comparing artificial gravity experiment performance options
    Keywords: BIOTECHNOLOGY
    Type: AIAA PAPER 71-860 , WEIGHTLESSNESS AND ARTIFICIAL GRAVITY MEETING; Aug 09, 1971 - Aug 11, 1971; WILLIAMSBURG, VA; US
    Format: text
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    NASA TECHNICAL REPORTS
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