Results 201 to 210 of about 2,310,283 (266)
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On the origin of lunar soil 12033
Earth and Planetary Science Letters, 1971Lunar soil 12033 bulk chemical analysis, suggesting mixture of exotic component with local soil in 41/59 ...
Philip A. Beadecker +4 more
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Study on geomechanical properties of lunar soil simulant (LSS-ISAC-1) for chandrayaan mission
, 2020Under Chandrayaan - II mission, simulation studies on lunar terrain were required for evaluation of the performance of rover and lander. In order to carry out mobility tests of a rover, it was required to prepare a lunar terrain testbed, which required a
I. Venugopal +4 more
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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.
Robert L Fleischer +2 more
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Journal of Terramechanics, 1964
The great research effort that has been mobilized to attempt solution of lunar exploration problems involving properties of soils and rocks on the Moon is summarized and reviewed. Current (1963) research activity has been examined within the framework of five categories: (1) Exploration and mapping of the lunar surface; (2) lunar soil formation and the
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The great research effort that has been mobilized to attempt solution of lunar exploration problems involving properties of soils and rocks on the Moon is summarized and reviewed. Current (1963) research activity has been examined within the framework of five categories: (1) Exploration and mapping of the lunar surface; (2) lunar soil formation and the
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Reviews of Geophysics, 1975
The moon is covered with a thin layer of unconsolidated debris called the lunar regolith. A typical sample of this regolith could be characterized as a gray, poorly sorted pebble‐ or cobble‐bearing silty sand having a bulk density of about 1.5 g/cm³. It consists of lithic and mineral fragments mostly from the local underlying bedrock and glass formed ...
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The moon is covered with a thin layer of unconsolidated debris called the lunar regolith. A typical sample of this regolith could be characterized as a gray, poorly sorted pebble‐ or cobble‐bearing silty sand having a bulk density of about 1.5 g/cm³. It consists of lithic and mineral fragments mostly from the local underlying bedrock and glass formed ...
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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.
John W. Salisbury, Joel E.M. Adler
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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.
John W. Salisbury, Joel E.M. Adler
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Equivalent boundary model of lunar soil drilling simulation by DEM
, 2020Aiming to solve the computational cost problem in the discrete element simulation for lunar soil drilling sampling, an equivalent boundary method was proposed. A high-accuracy DEM model of lunar soil was established firstly.
Tianxi Liu, L. Liang, Yang Zhao, D. Cao
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, 2020
The retention characteristics of the stratification information is one of the important factors of lunar soil drilling process. A high-accuracy DEM model of lunar soil was established and verified to be accurate both in shear strength indices and elastic-
Tianxi Liu, Z. Bai, Yang Zhao
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The retention characteristics of the stratification information is one of the important factors of lunar soil drilling process. A high-accuracy DEM model of lunar soil was established and verified to be accurate both in shear strength indices and elastic-
Tianxi Liu, Z. Bai, Yang Zhao
semanticscholar +1 more source
An alterable constitutive law of high-accuracy DEM model of lunar soil
, 2020The accuracy of discrete element model has great influence on the DEM simulations of lunar soil, especially on the soil-tool interaction simulations.
Tianxi Liu, L. Liang, Yang Zhao, D. Cao
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Acta Astronautica, 2020
During the landing of lunar probes on the surface of the Moon, lunar soil particles are lifted and diffused under the action of a plume. This study used three methods to numerically investigate the diffusion of lunar soil particles under a plume in a ...
Zhigang Bo +3 more
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During the landing of lunar probes on the surface of the Moon, lunar soil particles are lifted and diffused under the action of a plume. This study used three methods to numerically investigate the diffusion of lunar soil particles under a plume in a ...
Zhigang Bo +3 more
semanticscholar +1 more source