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  • 1
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    A scattering model for perfectly conducting random surfaces. I - Model development. II - Range of validity (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The surface current on a perfectly conducting randomly rough surface is estimated by solving iteratively a standard integral equation, and the estimate is then used to compute the far-zone scattered fields and the backscattering coefficients for vertical, horizontal and cross polarizations. The model developed here yields a simple backscattering coefficient expression in terms of the surface parameters. The expression reduces analytically to the Kirchhoff and the first-order small-perturbation model in the high- and low-frequency regions, respectively. The range of validity of the model is determined.
    Keywords: COMMUNICATIONS AND RADAR
    Type: International Journal of Remote Sensing (ISSN 0143-1161); 8; 1579-160
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Forecast of Future Aviation Fuels. Part 1: Scenarios (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A preliminary set of scenarios is described for depicting the air transport industry as it grows and changes, up to the year 2025. This provides the background for predicting the needs for future aviation fuels to meet the requirements of the industry as new basic sources, such as oil shale and coal, which are utilized to supplement petroleum. Five scenarios are written to encompass a range of futures from a serious resource-constrained economy to a continuous and optimistic economic growth. A unique feature is the choice of one immediate range scenario which is based on a serious interruption of economic growth occasioned by an energy shortfall. This is presumed to occur due to lags in starting a synfuels program.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-CR-158871 , UCLA-ENG-77-78-PT-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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