4 resultados para Rivadavia, Bernardino, 1780-1845.

em Chinese Academy of Sciences Institutional Repositories Grid Portal


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根据试验中观察到的土体破坏模式,建立了相应的破坏机构,用上限法对c-φ土中刚性桩的横向承载力进行了三维极限分析。将破坏土体分为3个塑性变形区,假设了满足运动边界条件的合理速度场,建立了求解光滑刚性桩横向承载力上限解的数学模型。通过极限分析发现光滑刚性桩承载力的上限解与差分解相差不大,并利用由有限差分法得到的规律对光滑桩承载力的上限解进行了修正,得到了粗糙桩承载力的粗略解。三维极限分析为计算刚性桩横向承载力提供了一种简便有效的方法。

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简要论述了长江三峡水库的形态和库区泥沙冲淤特点,重点分析了三峡水利枢纽工程建成后水库蓄水运行过程对库区泥沙淤积的影响,以及新形势下水库运行中需要进一步深入研究的重要问题,为优化三峡水库运行方式提供依据。

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Depth profiles of carrier concentrations in GaMnSb/GaSb are investigated by electrochemistry capacitance-voltage profiler and electrolyte of Tiron. The carrier concentration in GaMnSb/GaSb measured by this method is coincident with the results of Hall and X-ray diffraction measurements. It is indicated that most of the Mn atoms in GaMnSb take the site of Ga, play a role of acceptors, and provide shallow acceptor level(s).

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<正> 太阳磁场在大气中常常被描述为无力场,无力场的理论模型常常考虑成延伸至无穷远,或者人为地截止至有限的区域。事实上,太阳大气中的磁场往往被约束在有限的空间,通过一间断面与大气交接。