The metallography of meteoric iron
نویسندگان
چکیده
منابع مشابه
A global atmospheric model of meteoric iron
[1] The first global model of meteoric iron in the atmosphere (WACCM-Fe) has been developed by combining three components: the Whole Atmosphere Community Climate Model (WACCM), a description of the neutral and ion-molecule chemistry of iron in the mesosphere and lower thermosphere (MLT), and a treatment of the injection of meteoric constituents into the atmosphere. The iron chemistry treats sev...
متن کاملRemoval of meteoric iron on polar mesospheric clouds.
Polar mesospheric clouds are thin layers of nanometer-sized ice particles that occur at altitudes between 82 and 87 kilometers in the high-latitude summer mesosphere. These clouds overlap in altitude with the layer of iron (Fe) atoms that is produced by the ablation of meteoroids entering the atmosphere. Simultaneous observations of the Fe layer and the clouds, made by lidar during midsummer at...
متن کاملColor Metallography
Fig. 2 Microstructure of as-cast Au22%Al showing the “purple plague,” AuAl2 intermetallic (reddish), surrounded by the Al-AuAl2 eutectic after polishing to a 1 lm finish. Magnification bar is 50 lm long. Fig. 1 Microstructure of a porous high-carbon steel powder metallurgy specimen infiltrated with copper showing the natural color of the copper, which is easier to see when the steel has been ti...
متن کاملenvironmental effects of gol-e-gohar iron ore mine on groundwater of the area
gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...
Semi-Molten Meteoric Iron Associated with a Crop Formation
We report the unusual discovery of a natural iron "glaze" composed of fused particles of meteoritic origin, concentrated entirely within a crop formation in England, appearing shortly after the intense Perseid meteor shower in August, 1993. Physical and chemical characteristics as well as spatial distributions indicated reheating to a semi-molten state at the time of crop impact, suggesting inv...
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ژورنال
عنوان ژورنال: Bulletin of the United States National Museum
سال: 1944
ISSN: 0362-9236
DOI: 10.5479/si.03629236.184.1