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  • Other Sources  (5)
  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984  (2)
  • 1970-1974
  • 1986  (3)
  • 1981  (2)
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  • 2005-2009
  • 2000-2004
  • 1985-1989  (3)
  • 1980-1984  (2)
  • 1970-1974
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  • 1
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    Picosecond coherent anti-Stokes Raman scattering (CARS) study of vibrational dephasing of carbon disulfide and benzene in solution (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The vibrational dephasing of the 656/cm mode (nu1, a1g) of CS2 and the 991/cm mode (nu2, a1g) of benzene have been studied as a function of concentration in mixtures with a number of solvents using a ps time-resolved CARS technique. This technique employs two tunable synchronously-pumped mode-locked dye lasers in a stimulated Raman pump, coherent anti-Stokes Raman probe time-resolved experiment. Results are obtained for CS2 in carbon tetrachloride, benzene, nitrobenzene, and ethanol and for benzene nu2 in CS2. The dephasing rates of CS2 nu1 increase on dilution with the polar solvents and decrease or remain constant on dilution with the nonpolar solvents. The CS2/benzene solutions show a contrasting behavior, with the CS2 nu1 dephasing rate being nearly independent of concentration whereas the benzene nu2 dephasing rate decreases on dilution. These results are compared to theoretical models for vibrational dephasing of polyatomic molecules in solution.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
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    NASA TECHNICAL REPORTS
  • 2
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    The Galileo Attitude and Articulation Control System - A radiation-hard, high precision, state-of-the-art control system (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Galileo Mission and Spacecraft design impose tight requirements on the Attitude and Articulation Control System (AACS). These requirements, coupled with the flexible spacecraft, the need for autonomy, and a severe radiation environment, pose a great challenge for the AACS designer. The resulting design and implementation are described, along with the discovery and solution of the Single-Event Upset problem. The status of the testing of the AACS in the Integration and Test Laboratory as well as at the spacecraft level is summarized.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
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    NASA TECHNICAL REPORTS
  • 3
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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
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    NASA TECHNICAL REPORTS
  • 4
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    Analysis of forest structure using thematic mapper simulator data (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The potential of Thematic Mapper Simulator (TMS) data for sensing forest structure information has been explored by principal components and feature selection techniques. In a survey of forest structural properties conducted for 123 field sites of the Sequoia National Park, the canopy closure could be well estimated (r = 0.62 to 0.69) by a variety of channel bands and band ratios, without reference to the forest type. Estimation of the basal area was less successful (r = 0.51 or less) on the average, but could be improved for certain forest types when data were stratified by floristic composition. To achieve such a stratification, individual sites were ordinated by a detrended correspondence analysis based on the canopy of dominant species. The analysis of forest structure in the Sequoia data suggests that total basal area can be best predicted in stands of lower density, and in younger even-aged managed stands.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 113-121
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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
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    NASA TECHNICAL REPORTS
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