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  • Other Sources  (5)
  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984  (2)
  • 1970-1974
  • 1987  (3)
  • 1981  (2)
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  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984  (2)
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  • 1
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    The design of a microstrip antenna array for a UHF space telemetry link (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An array of microstrip antenna panels was designed for use on a small instrumented satellite as part of a 400-MHz telemetry link between that satellite and NASA's shuttle spacecraft. A roughly omnidirectional phi-plane pattern was desired. The 1.4-wavelength diameter of the satellite and the various ports and structures on its surface presented strong constraints on the antenna array design. Eight antennas, each one a quarter-wavelength panel with one radiating and one shorted edge, were chosen. A phi-plane pattern ripple of 4.4 dB and a gain of at least 0.1 dB relative to a half-wavelength dipole were realized. The design technique used for the individual antenna panels included the study of feed-point location for impedance matching and the effect of losses in the dielectric. A superposition method was used to synthesize the radiation patterns for different numbers and different excitations of antennas on the satellite.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE Transactions on Antennas and Propagation; AP-29; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Raster graphics display library (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Raster Graphics Display Library (RGDL) is a high level subroutine package that give the advanced raster graphics display capabilities needed. The RGDL uses FORTRAN source code routines to build subroutines modular enough to use as stand-alone routines in a black box type of environment. Six examples are presented which will teach the use of RGDL in the fastest, most complete way possible. Routines within the display library that are used to produce raster graphics are presented in alphabetical order, each on a separate page. Each user-callable routine is described by function and calling parameters. All common blocks that are used in the display library are listed and the use of each variable within each common block is discussed. A reference on the include files that are necessary to compile the display library is contained. Each include file and its purpose are listed. The link map for MOVIE.BYU version 6, a general purpose computer graphics display system that uses RGDL software, is also contained.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-181025 , NAS 1.26:181025 , ECGL-87-03
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Force, mass, and energy budgets of the Crary Ice Rise complex, Antarctica (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The stress, mass, and energy-dissipation budgets of Crary Ice Rise are analyzed using field data collected during the 1983-1985 austral summers and in previous field programs. In addition, the net back pressure and ice-discharge rate along the grounding lines of ice streams are calculated to assess the effect of the ice rise on the surrounding flow. Comparison of the ice-rise budgets with the analysis of grounding-line data confirms the influence of the ice rise on ice-sheet stability, and suggests that Crary Ice Rise may have formed recently in response to an acceleration of one of the ice streams. It is concluded that feedback between ice-stream acceleration and ice-rise formation may control the future evolution of the above ice stream and promote long-term grounding-line stability in the face of strong natural fluctuations.
    Keywords: GEOPHYSICS
    Type: Journal of Glaciology (ISSN 0022-1430); 33; 114; 218-230
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ice dynamics at the mouth of ice stream B, Antarctica (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Data collected in the region of the mouth of ice stream B, West Antarctica, during three field seasons are presented. The physical characteristics of the mouth of ice stream B are described, and the dynamics in the vicinity of the DNB network are discussed. The dynamics of ice stream B from DNB to the grounding line is briefly considered, and a force analysis of the grounding line region is made. The results demonstrate that the dynamic situation of the region at the mouth of ice stream B is distinctly different from either the greater portion of the ice stream upstream or the Ross ice shelf downstream.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 8885-889
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    An analysis of the effect of hemispheric land-ocean areal distribution upon earth's emitted longwave radiation (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Energy balance climate models are used to approximate the global climate based on a zonally-defined land and water area grid. A comparison is made between linear earth-atmosphere-emitted longwave radiation parameterization and a satellite data representation of the same radiation budget available. The satellite data indicate sharp differences between monthly averaged profiles of emitted LW radiation over land and water surfaces in low latitudes, which range from 40 watts/sq m in January, to 9 watts/sq m in May. It is concluded that the linear representation over land and water surfaces which are primarily functions of surface temperature do not characterize the differences in the land/water profiles shown to exist in the Nimbus 6 ERB data.
    Keywords: GEOPHYSICS
    Type: Conference on Atmospheric Radiation; Jun 16, 1981 - Jun 18, 1981; Toronto; Canada
    Format: text
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    NASA TECHNICAL REPORTS
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