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This short paper outlines the United States National Aeronautics and Space Administration's development of its 2000 Strategic Plan. 相似文献
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R.K. Crouch A.L. Fripp W.J. Debnam I.O. Clark P.G. Barber F.M. Carlson 《Acta Astronautica》1985,12(11):923-929
Lead-tin-telluride has been grown in a thermally stable mode (solutally unstable) and in a solutally stable (thermally unstable) mode in a Bridgman configuration. Significant differences in the crystal morphology and the compositional homogeneity have been found between the two configurations. In addition, for the solutally stable configuration, evidence has been found that the flow characteristics in the melt change drastically during the course of the run. 相似文献
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本文应用加权余量法推导了三维涡流场的有限元离散化方程,使得三维涡流场的有限元方程表达方便,概念清楚,计算较为简捷。 相似文献
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