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学习型组织理论是20世纪90年代以来在管理理论与实践中发展起来的一种前沿的管理理论,日益被人们所接受并运用到具体的工作中。在高校思想政治队伍中建立学习型组织,对于提高高校思想政治工作者素质,加强和改进大学生思想政治教育工作将发挥积极的作用。 相似文献
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Atomic bonding and mechanical properties of Al-Mg-Zr-Sc alloy 总被引:5,自引:0,他引:5
The valence electron structures of AI-Mg alloy with minor Sc and Zr were calculated according to the empirical electron theory(EET) in solid. The results show that because of the strong interaction of AI atom with Zr and Sc atom in melting during solidification, the Al3 Sc and Al3 (Sc1-xZrx) particles which act as heterogeneous nuclear are firstly crystallized in alloy to make grains refine. In progress of solidification, the Al-Sc, Al-Zr-Sc segregation regions are formed in solid solution matrix of Al-Mg alloy owing to the strong interaction of Al atom with Zr, Sc atoms in bulk of alloy, so in the following homogenization treatment, the finer dispersed Al3Sc and Al3 (Sc1-xZrx) second-particles which are coherence with the matrix are precipitated in the segregation region. These finer secondparticles with the strong Al—Zr, Al—Sc covalent bonds can strengthen the covalent bonds in matrix of the alloy, and also enhance the hardness and strength of Al-Mg alloy. Those finer second-particles precipitated in interface of sub-grains can also strengthen the covalence bonds there, and effectively hinder the interface of sub grains from migrating and restrain the sub-grains from growing, and cause better thermal stability of Al-Mg alloy. 相似文献
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Al-Zn固溶体价电子结构与Spinodal分解反应 总被引:4,自引:2,他引:4
运用固体经验电子理论,采用平均原子模型对Al-Zn固溶体价电子结构进行计算.计算结果表明:Spinodal分解引起合金固溶体的共价键强度发生较大变化,且可以根据各固溶体相的共价键强度的变化对Al-Zn固溶体在室温下发生的Spinodal分解反应所引起的合金硬化以及合金硬度的提高做出合理解释. 相似文献
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