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  • COMMUNICATIONS AND RADAR  (2)
  • ASTROPHYSICS  (1)
  • 2000-2004
  • 1985-1989  (3)
  • 1935-1939
  • 1985  (3)
  • 1
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    Subreflector Focusing Techniques Applied to New DSS-15 and DSS-45 34-meter Antennas (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-18
    Description: An improved technique to determine the subreflector translations required to properly focus a Cassegrainian antenna, under gravity loading, at a full range of elevation angles, is presented. This technique is applied to the 34-m antenna configuration installed at stations DSS-15 (Goldstone, California) and DSS-45 (Australia). The subreflector lateral and axial translations, to be stored into the antenna-control systems, are computed and tabulated. The relationships that govern the main parameters are also presented for future subreflector focusing analysis under wind and thermal loadings.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 83-90
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Design Procedure for the New 70-meter Antenna Subreflector Positioner (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-18
    Description: Design procedures are developed for determining Cassegrain type antenna subreflector positioner strength and displacements under wind and gravity loading conditions. The procedures are applied to the JPL 70-m antenna subreflector design, and the resulting design details are presented. The generalized analysis can be adapted to other antenna and subreflector-positioners. It is shown that the new design meets the strength and displacements criteria under worst case loading.
    Keywords: COMMUNICATIONS AND RADAR
    Type: The Telecommun. and Data Acquisition Rept.; p 68-82
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Self-consistent models for the X-ray emission from supernova remnants - An application to Kepler's remnant (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A tool for exploring the evolution of X-ray emission from young SNRs is presented which employs a novel approach to the problem of time-dependent ionization in a shock-heated plasma. The solution of this problem is coupled to a spherically symmetric hydrodynamic calculation for the evolution of a point explosion in a uniform medium. The method is applied to Kepler's SNR, and two narrowly constrained classes of models which can simultaneously fit the spectral and morphological features of the object are found. One of these is a Sedov model in which the emission arises from shocked ambient gas, and the other is a reverse-shock model in which the SN ejecta is the dominant source of radiation. The emission from one specific model in each class is compared with the radial surface brightness profile, the 0.2-4.5 keV broadband spectrum, and the 1-3 keV moderate-resolution spectrum of the remnant. Reasonable fits are obtained in both cases.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 291; 544-560
    Format: text
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    NASA TECHNICAL REPORTS
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