Results 181 to 190 of about 3,747 (227)

Limits of lunar soil density

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.
John W. Salisbury, Joel E.M. Adler
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Oxygen Production From Lunar Soil

SAE Technical Paper Series, 1995
<div class="htmlview paragraph">We have conducted experiments to release oxygen from lunar soil samples, as part of a continuing study of lunar resource production. The 15 soils span the range of compositions in the Apollo collection. All were reduced in flowing hydrogen at temperatures of 900-1100°C.
Carlton C. Allen, David S. McKay
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Lunar problems in soil engineering

Journal of Terramechanics, 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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Penetration resistance of lunar soils

Journal of Terramechanics, 1971
Abstract Penetration resistance, in terms of the slope G of the stress penetration curve, has been correlated with density for a basaltic lunar soil simulant. The values were measured with the standard WES 30° cone penetrometer. This lunar soil simulant has been found to possess the same penetration resistance characteristics as the Apollo ...
W.N. Houston, L.I. Namiq
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A lunar soil evolution model

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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Lunar soil grain size distribution

The Moon, 1973
A comprehensive review has been made of the currently available data for lunar grain size distributions. It has been concluded that there is little or no statistical difference among the large majority of the soil samples from the Apollo 11, 12, 14, and 15 missions.
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Magnetic separation of lunar soils

IEEE Transactions on Magnetics, 1991
The 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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Production of lunar soil simulant in Turkey

2017 8th International Conference on Recent Advances in Space Technologies (RAST), 2017
It is obvious that lunar structures will be constructed on lunar surface, and that the materials to be used are only lunar soil. That is why lunar soils has to be investigated thoroughly as to its physical, chemical and mechanical properties. Unfortunately there is not enough lunar rock or soil brought to Earth for being able to run these analyses. For
YAYLI, MUSTAFA ÖZGÜR, YEREL KANDEMİR, SÜHEYLA, ÇERÇEVİK, ALİ ERDEM, Toklu, Yusuf Cengiz   +3 more
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Lunar Soil Sampling and Testing

1962
The limited real data available on the lunar environment is presented and several selected references are listed. Soil is usually tested for the properties that are expected to change and differ from one environment to another, whereas the properties that are more or less in equilibrium in any terrestrial environment are not tested.
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Bearing strength of lunar soil

The Moon, 1971
Bearing load vs penetration curves have been measured on a 1.3 g sample of lunar soil from the scoop of the Surveyor 3 soil mechanics surface sampler, using a circular indentor 2 mm in diameter. Measurements were made in an Earth laboratory, in air.
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