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  • 1
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    Microcraters formed in glass by low density projectiles (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Microcrater morphology in soda-lime-silica glass by polystyrene spheres, detailing shape, density, velocity and incidence angle effects
    Keywords: SPACE SCIENCES
    Type: ; RO(
    Format: text
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  • 2
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    Microcraters in glass and minerals (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Microcrater morphology in lunar soil glass, oligoclase and olivine, determining projectile velocity, impact angle and shape effects
    Keywords: SPACE SCIENCES
    Type: ; RO(
    Format: text
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  • 3
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    Craters formed in mineral dust by hypervelocity microparticles. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: As a simulation of erosion processes on the lunar surface, impact craters were formed in dust targets by 2- to 5-micron-diameter polystyrene spheres with velocities between 2.5 and 12 km/sec. For weakly cohesive, thick targets of basalt dust with a maximum grain size comparable to the projectile diameter, the craters had an average projectile-to-diameter diameter ratio of 25, and the displaced mass was 3 orders of magnitude greater than the projectile mass. In a simulation of the effect of a dust covering on lunar rocks, a layer of cohesive, fine-grained basalt dust with a thickness nearly twice the projectile diameter protected a glass substrate from damage, but an area about 50 times the cross-sectional area of the projectile was cleared of all but a few grains. Impact damage was produced in glass under a thinner dust layer.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 77; Aug. 10
    Format: text
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  • 4
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    Accretionary processes in the early solar system - An experimental approach. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Results are given of an experiment to determine the range of silicate particle velocities over which accretion occurs. It was shown that micrometer-size silicate flakes do not accrete during impacts in the velocity range of 1.5 to 9.5 km/sec. Silicate accretion took place only between particles whose orbits were similar. Over at least part of the velocity range in which silicate accretion was efficient, metal particles would have rebounded without accreting. This suggests that if both metal and silicate were present during accretion, fractionation of one with respect to the other would have occurred.
    Keywords: SPACE SCIENCES
    Type: Science; 177; July 14
    Format: text
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  • 5
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    A chondrule - Evidence of energetic impact unlikely (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: It had been concluded by Lange and Larimer (1973) that the morphology and mineralogy of an unusual chondrule from the Ngawi meteorite are the results of a highly energetic impact within the solar nebula. The evidence for this conclusion is examined. It is found that the chondrule does not show evidence of high relative velocities in the solar nebula. It is pointed out that arguments against chondrule production by impact on planetary surfaces on the basis of ejection velocities are not supported by laboratory experiments.
    Keywords: SPACE SCIENCES
    Type: Science; 185; July 26
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  • 6
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    Micrometeoroids. (1965)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: Size, distribution, velocities, penetration and densities of meteoroids and micrometeoroids, noting sounding rocket data
    Keywords: SPACE SCIENCES
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  • 7
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    The micrometeoroid complex and evolution of the lunar regolith (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Monte Carlo-based computer calculations, as well as analytical approaches utilizing probabilistic arguments, were applied to gain insight into the principal regolith impact processes and their resulting kinetics. Craters 10 to 1500 m in diameter are largely responsible for the overall growth of the regolith. As a consequence the regolith has to be envisioned as a complex sequence of discrete ejecta blankets. Such blankets constitute first-order discontinuities in the evolving debris layer. The micrometeoroid complex then operates intensely on these fresh ejecta blankets and accomplishes only in an uppermost layer of approximately 1-mm thickness. The absolute flux of micrometeoroids based on lunar rock analyses averaged over the past few 10 to the 6th power years is approximately an order of magnitude lower than presentday satellite fluxes; however, there is indication that the flux increased in the past 10 to the 4th power years to become compatible with the satellite data. Furthermore, there is detailed evidence that the micrometeoroid complex existed throughout geologic time.
    Keywords: ASTROPHYSICS
    Type: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, Pt. 2; p 605-635
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  • 8
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    Microcraters formed in glass by low density projectiles (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microcraters were produced in soda-lime glass by the impact of low density projectiles of polystyrene with masses between 0.7 and 62 picograms and velocities between 2 and 14 kilometers per second. The morphology of the craters depends on the velocity and angle of incidence of the projectiles. The transitions in morphology of the craters formed by polystyrene spheres occur at higher velocities than they do for more dense projectiles. For oblique impact, the craters are elongated and shallow with the spallation threshold occuring at higher velocity. For normal incidence, the total displaced mass of the target material per unit of projectile kinetic energy increases slowly with the energy.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-68301 , ONERA-NT-01-13-71
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  • 9
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    Microcraters formed in glass by low density projectiles (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Microcraters were produced in soda-lime glass by the impact of low density projectiles of polystyrene (p = 1.06 g/cu cm) with masses between 0.7 and 62 picograms and velocities between 2 and 14 km/s. The morphology of the craters depended on the velocity and the angle of incidence of the projectiles and these are discussed in detail. It was found that the transitions in morphology of the craters formed by polystyrene spheres occurred at higher velocities than they did for more dense projectiles.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-TM-X-67469
    Format: application/pdf
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  • 10
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    An experimental approach to circumsolar accretion. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Experimental investigation of planetesimal accretion from grains in intersecting orbits. The study is aimed particularly at the velocity impact behavior of silicates, which comprise the major fraction of condensable material in the solar system.
    Keywords: SPACE SCIENCES
    Type: Symposium on The origin of the solar system; Apr 03, 1972 - Apr 07, 1972; Nice; France
    Format: text
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