861 resultados para 091307 Numerical Modelling and Mechanical Characterisation
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"Directorate of Materials and Processes, Contract no. AF33(616)-7005, Project no. 7340."
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Includes annual reports and lists of members of the institute.
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Description based on: 23rd (1910).
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Mode of access: Internet.
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Mode of access: Internet.
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"Embodies a course given by the writer for a number of years in the mathematical laboratory of the Massachusetts Institute of Technology."
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Mode of access: Internet.
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Includes index.
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Added t.-p., illus.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Granular gamma-Al2O3 support and 8 wt % CuO/gamma-Al2O3 catalyst were synthesized by a sol-gel granulation method. The pore structure, crush strength, hardness, and elasticity of these sol-gel-derived catalysts were studied and compared with similar commercial catalysts prepared by non-sol-gel methods. Alumina and CuO-coated alumina granular particles prepared by different methods have different macro- and microstructure. The sol-gel-derived granular gamma-alumina and CuO-coated gamma-alumina granular particles have a structure defined by compact packing of uniform, nanosized gamma-alumina crystallites. They are characterized by a more uniform pore size distribution and larger surface area as compared to similar commercial samples with a structure defined by packing of aggregates consisting of nonuniform gamma-alumina crystallites. Because of the differences in the macro- and microstructure, the sol-gel-derived granular samples offer higher crush strength and greater hardness than the commercial samples.
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The addition of 1 wt-%Sr to AE42 results in an improvement in the tensile strength of the alloy at elevated temperatures of 150 and 175degreesC and an improvement in the constant load creep properties at 175degreesC. The improved elevated temperature tensile and creep strength of the alloy can be attributed to the presence of a strontium-containing phase in the microstructure of the alloy along with an increase in the stability of the microstructure of the alloy at high temperatures. (C) 2004 W. S. Maney Son Ltd.