Results 221 to 230 of about 37,445 (245)
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Icarus, 1967
Abstract Recent laboratory experimental evidence concerning the photometric properties of the lunar surface materials, as well as the Surveyor I photographs, have thrown considerable doubt on the highly underdense, “fairy castle” model of the uppermost lunar surface layer.
Joel E. M. Adler, John W. Salisbury
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Abstract Recent laboratory experimental evidence concerning the photometric properties of the lunar surface materials, as well as the Surveyor I photographs, have thrown considerable doubt on the highly underdense, “fairy castle” model of the uppermost lunar surface layer.
Joel E. M. Adler, John W. Salisbury
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The Moon, 1975
Comminution, agglutination, and replenishment processes in a lunar soil are modeled by a system of time-dependent linear differential equations. In the model, a soil is subdivided into coarse-particle, fine-particle, and agglutinate fractions. The relative mass abundance of each component in a mature soil is found to be proportional to rates for the ...
W. W. Mendell, D. S. Mckay
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Comminution, agglutination, and replenishment processes in a lunar soil are modeled by a system of time-dependent linear differential equations. In the model, a soil is subdivided into coarse-particle, fine-particle, and agglutinate fractions. The relative mass abundance of each component in a mature soil is found to be proportional to rates for the ...
W. W. Mendell, D. S. Mckay
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Lunar Problems in Soil Engineering [PDF]
Journal of the Soil Mechanics and Foundations Division, 1965 In the relatively near future unmanned, and perhaps manned spacecraft will make soft landings on the moon, and ultimately on some of the other planets. Because our knowledge of the intimate small-scale properties of the lunar surface is almost nonexistent, it is desireable to devise surface models and materials in line with current information for the ...
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Multielement Analysis of Lunar Soil and Rocks
Science, 1970Results for multielement analysis of lunar soil and of seven rocks returned by Apollo 11 are presented. Sixty-six elements were determined with spark source mass spectrography and neutron activation. U. S. Geological Survey standard W-1 was used as a comparative standard.
Ann M. Rothenberg +6 more
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Development of Soil on the Lunar Surface
SEPM Journal of Sedimentary Research, 1972Discussion of the dynamic processes involved in the evolution of the lunar soil. Size, shape, and modal analyses of soil returned by Apollo 11, 12, 14, and 15, and Luna 16 indicate that the two most important dynamic processes resulting from meteorite impact are vitrification and comminution of the detrital material.
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Magnetic separation of lunar soils
IEEE Transactions on Magnetics, 1991The authors report measurements of the distribution by magnetic susceptibility of anorthite, ilmenite, pyroxene, and metallic iron separated from the minus 1-mm size fraction of five lunar samples using a Frantz isodynamic separator. Low-iron content, pure anorthite was separated from the feebly paramagnetic fractions of an immature anorthistic ...
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Surface history of lunar soil and soil columns
Geochimica et Cosmochimica Acta, 1974Measurements of cosmic ray track densities are presented for soil samples from Apollo 15, 16, and 17. Median track densities are used to infer total effective exposure times within about 15 cm of the lunar surface. Minimum track densities are used to derive the time of the last impact-produced rearrangement of soil grains.
Wallace R Giard +2 more
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Acta Geologica Sinica - English Edition, 2011
Abstract:Two new lunar mare soil simulants, NAO‐2 and NAO‐3, have been created in National Astronomical Observatories (NAO), Chinese Academy of Sciences. These two simulants were produced from low‐titanium basalt and high‐titanium basalt respectively. The chemical composition, mineralogy, particle size distribution, density, angle of internal friction,
Yongquan Li +5 more
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Abstract:Two new lunar mare soil simulants, NAO‐2 and NAO‐3, have been created in National Astronomical Observatories (NAO), Chinese Academy of Sciences. These two simulants were produced from low‐titanium basalt and high‐titanium basalt respectively. The chemical composition, mineralogy, particle size distribution, density, angle of internal friction,
Yongquan Li +5 more
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Size Distribution of Lunar Soil
Nature, 1970WHEN Duke et al.1 measured the size of lunar soil returned by Apollo 11, they found a size distribution similar to that of glacial till and other terrestrial soil, except that the lunar soil is noticeably deficient in material finer than 15 µm. They feel that a partial explanation for this deficiency is that it is caused by melting and consequent ...
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Highly aluminous glasses in lunar soils and the nature of the lunar highlands
Geochimica et Cosmochimica Acta, 1972Abstract Approximately 25 per cent of the glasses in two Apollo 14 soil samples and in the soils at two levels in the Luna 16 core have compositions equivalent to anorthositic gabbro. Reassessment of the non-mare glass components in the Apollo 11 and 12 soils shows that glasses with the composition of anorthositic gabbro are common to both; gabbroic ...
R. W. Brown +6 more
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