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<正>Embedding Periodic Maps on Surfaces into Those on S~3Yu GUO Chao WANG Shicheng WANG Yimu ZHANG Call a periodic map h on the closed orientable surface∑_g extendable if h extends to a periodic map over the pair(S~3,∑_g)for possible embeddings e:∑_g→S~3.The authors determine the extendabilities for all periodical maps on∑_2.The results involve various orientation preserving/reversing  相似文献   

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正Exact Boundary Observability for a Kind of Second-Order Quasilinear Hyperbolic Systems Ke WANG Based on the theory of semi-global classical solutions to quasilinear hyperbolic systems,the local exact boundary observability for a kind of second-order quasilinear hyperbolic systems is obtained by a constructive method.  相似文献   

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正Existence and Global Asymptotic Behavior of Positive Solutions for Sublinear and Superlinear Fractional Boundary Value Problems Imed BACHAR Habib MAAGLI Faten TOUMI Zagharide ZINE EL ABIDINE In this paper,the authors aim at proving two existence results of fractional differential boundary value problems of the form  相似文献   

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正Stochastic H_22/H_∞Control for Poisson Jump-Diffusion Systems Meijiao WANG This paper is concerned with stochastic H_2/H_∞control problem for Poisson jump-diffusion systems with(x,u,v)-dependent noise,which are driven by Brownian motion and Poisson random  相似文献   

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<正>Regularized Principal Component Analysis Yonathan AFLALO Ron KIMMEL Given a set of signals,a classical construction of an optimal truncatable basis for optimally representing the signals,is the principal component analysis(PCA for short)approach.When the information about the signals one would like to represent is a more general property,like smoothness,a different basis should be considered.One example is the Fourier basis which is optimal for  相似文献   

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<正>A Survey on Mixed Spin P-FieldsHuai-Liang CHANG Jun LI Wei-Ping LI Chiu-Chu Melissa LIU The mixed spin P-fields(MSP for short)theory sets up a geometric platform to relate GromovWitten invariants of the quintic three-fold and Fan-Jarvis-Ruan-Witten invariants of the quintic polynomial in five variables.It starts with Witten's vision and the P-fields treatment of GW invariants and FJRW invariants.Then it briefly discusses the master space technique and its  相似文献   

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Nash and Stackelberg Difierential Games Alain BENSOUSSAN Jens FREHSE Jens VOGELGESANG A large class of stochastic differential games for several players is considered in this paper.The class includes Nash differential games as well as Stackelberg differential games.A mix is possmle.  相似文献   

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一维等熵流方程组的反活塞问题李大潜王利彬对一维等熵流方程组的反活塞问题进行了研究,并且获得了在一定条件下,活塞的速度能由活塞右端气体的初始状态和前向激波的位置唯一决定.一个多项式问题产生的线性方程组及其应用马文秀Boris SHEKHTMAN对一个逼近论中的多项式问题产生的线性方程组进行了研究,给出了解存在和唯一的充要条件.结合一类行列式恒等式,应用建立的理论显式确定了相应的多项式问题的唯一解.其它应用的结果包  相似文献   

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<正>On the Error Estimate of the Harmonic B_z Algorithm in MREIT from Noisy Magnetic Flux Field Qun CHEN Jijun LIUMagnetic resonance electrical impedance tomography(MREIT,for short)is a new medical imaging technique developed recently to visualize the cross-section conductivity of biologic tissues.A new MREIT image reconstruction method called harmonic B_z algorithm was proposed in 2002with the measurement of B_z that is a single component of an induced magnetic flux density subject to an injection current.The key idea is to solve a nonlinear integral equation by some iteration  相似文献   

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局部分布反馈下半线性波动方程的指数镇定贾超华冯德兴文中利用黎曼几何乘子方法考虑了一个带局部阻尼的变系数半线性波动解的指数衰减问题,得到一个使系统指数稳定的几何条件.  相似文献   

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构造一类时间为二阶的发展方程的惯性流形王宗信构造了关于时间为二阶的发展方程的惯性流形证明了惯性流形的渐近完备性,并指出惯性流形由增长为O(e-μt)(μ>0)的所有轨道组成.作为应用,还考虑了一类非线性波动方程和一个薄板的非线性振动问题非线性固定平面弹性...  相似文献   

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