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  • LUNAR AND PLANETARY EXPLORATION  (2)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (1)
  • 2010-2014
  • 1985-1989  (3)
  • 1925-1929
  • 1985  (3)
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  • 2010-2014
  • 1985-1989  (3)
  • 1925-1929
Year
  • 1
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    Antenna Radiation-Pattern Program (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Effects of reflector deformations and feed characteristics computed. JPL Antenna Radiation Pattern computer program ANRAD, evaluates performance of radio-frequency antenna with paraboloidal main reflector by solving scalar far-field radiation pattern integral.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16217 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 324
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Apollo 14 aluminous mare basalts and their possible relationship to KREEP (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Thirty-six aluminous mare basalt fragments from breccia 14321 and other Apollo 14 basalts are statistically divided into two broad groups, comprising five subgroups, using La, Sm, and Yb data. Major element compositions, petrographic characteristics, and mineral compositions are similar for the five groups. However, there is an eight-fold increase in REE abundances from Group 5 to Group 1, with Group 1 having a REE pattern similar to KREEP. Groups 1 to 3 may be related by partial melting of a source similar to that proposed by Unruh et al. (1984) for feldspathic basalt 12038. However, Groups 4 and 5 cannot be as closely matched by larger degrees of partial melting of this source. Groups 1 to 4 could also be produced by assimilation of a KREEP component by a magma similar in composition to Group 5. Such a magma can be produced by partial melting of an olivine-orthopyroxene source that crystallized from a magma with chondritic relative REE abundances.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 90; C365-C37
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Zr-Hf-Ta fractionation during lunar evolution (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Zr/Hf ratios and other elemental data in 68 samples of various mare basalts, KREEP units, and lunar glasses have been determined using instrumental neutron activation analysis coupled with coincidence-anticoincidence counting for greater precision. The data are presented in order to quantify further the amount of Zr/Hf fractionation that has occurred during primordial crystallization and cumulate remelting or by any other process. Models of Zr-Hf evolution are developed to place additional constraints on the bulk lunar composition and on the effects of minor phases that may be responsible for the observed fractionations. The Hf-Ta fractionation in lunar compositions is also reviewed in order to characterize normal Hf(4+) versus Ta(4+) behavior and to delineate possible effects due to the oxidation of Ta(4+) to Ta(5+) during late-stage ilmenite crystallization.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research, Supplement (ISSN 0148-0227); 90; D31-D45
    Format: text
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    NASA TECHNICAL REPORTS
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