13 resultados para heat diffusion in semiconductors

em University of Michigan


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Prepared for Office, Chief of Engineers, U.S. Army, Washington, D.C.

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Mode of access: Internet.

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The generation of heat due to the radioactive decay of plutonium in the form of plutonium dioxide stored in wooden containers is considered. The results of two experiments in which plutonium dioxide is placed inside wooden blocks and the temperature rise measured at various points is reported. Heat transfer calculations are then performed to show that the data obtained are those which would be expected, i.e., that Fourier's Law adequately describes the situation. The heat build up in a proposed wood moderated shipping container is calculated, using some of the assumptions verified in the described experiments.

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"NSF grant no. G-19697."

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"Materials Laboratory. Contract no. AF 33(616)-3299, Project no. 7360."

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Cowinner in the Poultry Disease Essay Contest, 1961.

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"ORNL-985."

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"This report was prepared by University of Florida, Gainesville, Florida, under USAF Contract no. F 33615-67-C-1227."

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Experimental evidence is presented which proves that voids formed during diffusion in brass are heterogeneously nucleated. The nuclei appear to be oxide particles, probably ZnO. When these are removed by re-melting, voids practically do not form upon subsequent dezincification. Brass which had been freed of void nucleation catalysts exhibited a considerably reduced tendency for grain boundary cracking during creep, and increased stress-rupture life.