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  • Other Sources  (3)
  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984
  • 1970-1974
  • 1985  (3)
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  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984
  • 1970-1974
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  • 1
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    The Galileo attitude and articulation control system - A radiation-hard, high precision, state-of-the-art control system (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Galileo mission and spacecraft, consisting of a Jupiter-orbiter and an atmospheric entry probe, are discussed. Components will include: magnetometers and plasma-wave antennas on a boom, high-gain antenna, probe vehicle, two different bus electronics packages, and a radioisotope thermoelectric generator. Instruments, investigators and objectives are tabulated for both probe science and orbiter science investigations. Requirements in the design of the attitude and articulation control system are very stringent because of the complex dynamics, flexible body effects, the need for autonomy, and the severe radiation environment in the Jupiter nighborhood. Galileo was intended to be ready for launch via Space Shuttle in May of 1986.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mark 4A project training evaluation (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A participant evaluation of a Deep Space Network (DSN) is described. The Mark IVA project is an implementation to upgrade the tracking and data acquisition systems of the dSN. Approximately six hundred DSN operations and engineering maintenance personnel were surveyed. The survey obtained a convenience sample including trained people within the population in order to learn what training had taken place and to what effect. The survey questionnaire used modifications of standard rating scales to evaluate over one hundred items in four training dimensions. The scope of the evaluation included Mark IVA vendor training, a systems familiarization training seminar, engineering training classes, a on-the-job training. Measures of central tendency were made from participant rating responses. Chi square tests of statistical significance were performed on the data. The evaluation results indicated that the effects of different Mark INA training methods could be measured according to certain ratings of technical training effectiveness, and that the Mark IVA technical training has exhibited positive effects on the abilities of DSN personnel to operate and maintain new Mark IVA equipment systems.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommunications and Data Acquisition Report; p 134-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Insulating Cryogenic Pipes With Frost (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Crystallized water vapor fills voids in pipe insulation. Small, carefully controlled amount of water vapor introduced into dry nitrogen gas before it enters aft fuselage. Vapor freezes on pipes, filling cracks in insulation. Ice prevents gaseous nitrogen from condensing on pipes and dripping on structure, in addition to helping to insulate all parts. Industrial applications include large refrigeration plants or facilities that use cryogenic liquids.
    Keywords: MACHINERY
    Type: MSC-20426 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 141
    Format: text
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    NASA TECHNICAL REPORTS
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