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常见的钛合金热变形本构模型分析及未来发展 总被引:1,自引:0,他引:1
概括总结了钛合金热变形本构模型的三种建立途径,分别介绍了并联概率模型、多项式模型、Arrhenius方程、动态回复与动态再结晶本构模型、Johnson-Cook模型、Zerrilli-Armstrong模型、人工神经网络模型等钛合金本构模型的建立方法、优缺点以及应用现状。结合材料的微观组织结构与宏观变形行为建立本构模型,统一本构模型建立方法及模型形式,依据具体实验条件修正本构模型,建立精确高效的计算系统将成为钛合金本构模型发展的主要方向。 相似文献
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能本管理是现代管理的新思想,是人本管理发展的新阶段,在我国具有十分重要的现实意义.为发挥其实际效能,本文首先明确了能本管理的涵义和作用,分析了能本管理在我国发展中的地位和价值,最后结合我国实际情况,研究了能本管理对我国发展的现实意义. 相似文献
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本文阐述了生本教育教学设计理念,提出了生本教育理念下物理课堂教学设计的要求及方法并给出了实际的教学案例. 相似文献
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自从晋安区实验幼儿园开展了绘本的特色教育后,很多小朋友都爱上了绘本,爱卜了绘本里精美的图片和精彩的内容,能够开开心心的看书.我们的绘本特色教育,也得到了家长们的大力支持,收集了大量亲子阅读照片、参加"悦读宝宝"、"悦读家庭"的评选等活动.看到家长们对绘本有着十分踊跃的激情,作为正在浩瀚的绘本世界的海洋中邀游的老师,我更是深受十二分的鼓舞啊!于是,我开始努力尝试着将绘本元素融于泥工教学活动的探索实践研究活动. 相似文献
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刘根保 《有色冶金设计与研究》2010,31(1):36-38
采用fortran语言编写了Duncan-Chang本构模型子程序,实现了有限元软件ABAQUS的二次开发,再利用UMAT子程序接口导入Duncan-Chang的E-B本构模型对垃圾土边坡稳定性进行分析。通过与极限平衡法中的Bishop法和Morgenstern-Price法比较,对基于Duncan-Chang本构模型的有限元法在垃圾土边坡稳定性分析的合理性进行了探讨。 相似文献
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倪志安 《Canadian Metallurgical Quarterly》2011,23(3)
马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础. 相似文献
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D. N. Reznikov 《Metallurgist》1962,6(12):535-537
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The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease. 相似文献
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Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions. 相似文献
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