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  • 1
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    Lunar permafrost - Dielectric identification. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A simulator of lunar permafrost at 100 K exhibits a dielectric relaxation centered at approximately 300 hertz. If permafrost exists in the moon between 100 and 213 K, it should present a relaxation peak at approximately 300 hertz. For temperatures up to 263 K it may go up to 20 kilohertz.
    Keywords: SPACE SCIENCES
    Type: Science; 179; Mar. 16
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Permafrost - Relation between ice content and dielectric losses at 100 K (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The dielectric response of permafrost at 100 K and vacuums of around 10 ntorr is analyzed, varying its percent ice content from 1 to 18.6. The distributions obtained correspond to dielectric relaxations of the Cole-Cole type, with maximum losses occurring in the 30- to 600-Hz frequency range. The logarithms of such maxima depend linearly on the permafrost ice content, two regions of linear variation being defined above and below 3.6% ice content. Such relations point out the feasibility of determining ice content in permafrost by electromagnetic means.
    Keywords: SPACE SCIENCES
    Type: Earth and Planetary Science Letters; 20; 3; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Lunar powder simulator under lunarlike conditions - Dielectric properties (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A powered basalt simulating lunar regolith material was subjected to temperature variations similar to those found in the lunar surface during a lunation. To obtain the dielectric response under simulated lunar conditions, all measurements were made in appropriate vacuums which, in addition, allowed for an evaluation of moisture effects in the powdered sample. It is found that during approximately seven tenths of a lunation the dielectric response of a 5- to 10-cm surface layer should be fairly constant. During the remaining three tenths, it should undergo rapid changes. Changes in the dielectric properties of the surface layer should be controlled by temperature. In the subjacent layers such changes are thought to be controlled by the increasing density of the regolith.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 78; Oct. 10
    Format: text
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    NASA TECHNICAL REPORTS
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