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  • Other Sources  (3)
  • NASA Technical Reports  (3)
  • ASTRONOMY  (2)
  • FLUID MECHANICS AND HEAT TRANSFER  (1)
  • Geophysics
  • 1985-1989  (3)
  • 1987  (3)
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  • Other Sources  (3)
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  • NASA Technical Reports  (3)
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  • 1985-1989  (3)
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  • 1
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    Efficient numerical simulation of an electrothermal de-icer pad (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In this paper, a new approach to calculate the transient thermal behavior of an iced electrothermal de-icer pad was developed. The method of splines was used to obtain the temperature distribution within the layered pad. Splines were used in order to create a tridiagonal system of equations that could be directly solved by Gauss elimination. The Stefan problem was solved using the enthalpy method along with a recent implicit technique. Only one to three iterations were needed to locate the melt front during any time step. Computational times were shown to be greatly reduced over those of an existing one dimensional procedure without any reduction in accuracy; the curent technique was more than 10 times faster.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 87-0024
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Large space observatories of the 21st century (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Early in the 21st century, advanced space telescopes will be readied to continue the astronomical observations of the Great Observatories currently under development. This paper describes representative concepts from the very large UV/optical and gamma-ray telescopes under study by NASA, the scientific community, and industry. These studies demonstrate that historical approaches to improving the resolution and sensitivity of space telescopes have reached technology barriers which can only be overcome by innovative solutions to the telescope design. Some of the key technology issues which are guiding the approaches for advanced space telescopes are discussed, and arguments are presented that enabling technology development for these future systems must commence now.
    Keywords: ASTRONOMY
    Type: AIAA PAPER 87-0636
    Format: text
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  • 3
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    Additional atmospheric opacity measurements at lambda = 1.1 mm from Mauna Kea Observatory, Hawaii (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Atmospheric opacity values in the zenith direction are given for a wavelength of 1.1 mm (278 GHz) at the summit of Mauna Kea in the Hawaiian Islands. A total of 75 days is covered during the period 1983-1986. Observations were made on a quasi-continuous basis, with opacity measured every 20 minutes around the clock for significant periods of time. A conversion from opacity at lambda = 1.1 mm to the equivalent precipitable water vapor column is given from the measurements of Zammit and Ade (1981), from which opacities at other wavelengths may be derived.
    Keywords: ASTRONOMY
    Type: International Journal of Infrared and Millimeter Waves (ISSN 0195-9271); 8; 431-440
    Format: text
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    NASA TECHNICAL REPORTS
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