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In this paper,we prove that the Veronese surface can be determined by the 1-spectrum of the Laplace operator. 相似文献
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ZHUHuai－liang 《上海大学学报(英文版)》2001,5(1):35-39
In this paper ,a hybrid approach was developed to investigate the transient responses of a multi-span non-uniform flexble spinning shaft with nonlinear and asymmetric supports.The non-uniform spinning shaft with variable parmeters was modeled as a Bernoulli-Euler beam column with sectional constant cross-section properties by the finite element method.The supporting stiffness behavior of the nonlinear supports was described as a piecewise-linear and asymmetric model.The equations of motion in the matrix form of a multi-span non-uniform spinning shaft with nonlinear and asymmetric supports were formulated using Hamilton‘s principle and the assumed mode method.As an example,a spinning rocket with many variable stiffness supports was numerically simulated by the direct integration method.The transient response and dynamic behavior of this rotate-dynamic system are analyzed. 相似文献
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SHENGPing－xing 《上海大学学报(英文版)》2001,5(2):96-103
This paper deals with Hilbert‘s 16th problem and its generalizations.The configurations of all closed branches of an algebraic curve of degreee n are discussed.The maximum number of sheets for an algebraic equation of degree n and the maximum number of limit cycles for a planar algebraic autonomous system are achieved.The author also considers different generalizations and some related problems. 相似文献
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提问可以带来最好的课堂教学体验。历时三周的生物单元教学结束后,我问二年级的学生他们还想要学习植物的其他什么知识。他们的问题是开展为期三周的植物生长的探究过程的前提。从问题提出到结果呈现,学生们带着自己的问题经历了探究式学习的全过程。在此前的三周里,学生们学习了生物和非生物的相关知识、植物生长和变化的情况、动物生长和变化的情况。学生们还学习了植物发芽的知识,并观察了植物从种子到长成幼苗的生长过程。这被证明是我们探究过程中很适用的背景知识,因此,我能进一步评估学生的学习情况,并巩固我们已经学过的关于植物生… 相似文献
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物理学在最近10年取得了重大进展,其中许多进展是开发和应用昂贵的大型研究装置的结果。合作是其进一步发展的关键,而国际组织起着特殊作用,因它们可以确保整个物理学界通过合作项目和人员培训在发达国家和发展中国家参与合作。 相似文献
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