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  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (4)
  • AERODYNAMICS
  • Life and Medical Sciences
  • 1985-1989  (5)
  • 1987  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Acute exposure of rats to air ions: Effects on the regional concentration and utilization of serotonin in brain (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 8 (1987), S. 173-181 
    Details
    ISSN: 0197-8462
    Keywords: DC electric fields ; 5-hydroxyindoleacetic acid ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Exposure to electrically charged gas molecules (air ions) has been reported to influence physiological and behavioral functions in animals and humans although there is controversy as to whether these findings are valid. A popular hypothesis concerning the reported effects of air ions is that alterations in serotonin (5HT) metabolism, particularly in the brain, are involved. We measured the concentration and turnover of 5HT in rats exposed to 5.0 × 105 ions/cm3 for up to 66 hours. Contrary to previous reports of other investigators, we were unable to demonstrate any effect of exposure to air ions or associated DC electric fields on the concentration or turnover of 5HT in rats under carefully controlled and characterized exposure conditions.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250080208
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Hoop/column and tetrahedral truss electromagnetic tests (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The distortion of antennas was measured with a metric camera system at discrete target locations on the surface. Given are surface distortion for hoop column reflector antennas, for tetrahedral truss reflector antennas, and distortion contours for the tetrahedral truss reflector. Radiation patterns at 2.27-GHz, 4.26-GHz, 7.73-GHz and 11.6-GHz are given for the hoop column antenna. Also given are radiation patterns at 4.26-GHz and 7.73-GHz for the tetrahedral truss antenna.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA(DOD Control)Structures Interaction Technology, 1986; p 737-746
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Controls-structures-electromagnetics interaction program (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A technology development program is described involving Controls Structures Electromagnetics Interaction (CSEI) for large space structures. The CSEI program was developed as part of the continuing effort following the successful kinematic deployment and RF tests of the 15 meter Hoop/Column antenna. One lesson learned was the importance of making reflector surface adjustment after fabrication and deployment. Given are program objectives, ground based test configuration, Intelsat adaptive feed, reflector shape prediction model, control experiment concepts, master schedule, and Control Of Flexible Structures-II (COFS-II) baseline configuration.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA(DOD Control)Structures Interaction Technology, 1986; p 701-715
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Integrated structure electromagnetic optimization of large space antenna reflectors (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The requirements for extremely precise and powerful large space antenna reflectors have motivated the development of a procedure for shape control of the reflector surface. A mathematical optimization procedure has been developed which improves antenna performance while minimizing necessary shape correction effort. In contrast to previous work which proposed controlling the rms distortion error of the surface thereby indirectly improving antenna performance, the current work includes electromagnetic (EM) performance calculations as an integral of the control procedure. The application of the procedure to a radiometer design with a tetrahedral truss backup structure demonstrates the potential for significant improvement. The results indicate the benefit of including EM performance calculations in procedures for shape control of large space antenna reflectors.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-89110 , NAS 1.15:89110 , AIAA PAPER 87-0824-CP
    Format: application/pdf
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  • 5
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    Integrated structural electromagnetic optimization of large space antenna reflectors (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The requirements for extremely precise and powerful large space antenna reflectors have motivated the development of a procedure for shape control of the reflector surface. A mathematical optimization procedure has been developed which improves antenna performance while minimizing necessary shape correction effort. In contrast to previous work which proposed controlling the rms distortion error of the surface thereby indirectly improving antenna performance, the current work includes electromagnetic (EM) performance calculations as an integral part of the control procedure. The application of the procedure to a radiometer design with a tetrahedral truss backup structure demonstrates the potential for significant improvement. The results indicate the benefit of including EM performance calculations in procedures for shape control of large space antenna reflectors.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 87-0824
    Format: text
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    NASA TECHNICAL REPORTS
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