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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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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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Imaging Analysis by Means of Fractional Fourier Transform 总被引：2，自引：0，他引：2
Starting from the diffraction imaging process,we have discussed the relationship between optical imaging system and tional Fourier transform,and proposed a specific system which can form an inverse amplified image of input function. 相似文献