检索结果-南通市图书馆

Heisenberg群上的Hardy不等式与Pohozaev恒等式

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

数学学报（中文版） 2003年第2期46卷 279-290页

作者：钮鹏程张慧清罗学波西北工业大学应用数学系西安710072

本文对Heisenberg群Hn上的p次Laplace算子ΔHn,p构造了基本解,建立了关于基向量场的Picone恒等式,进而建立了Hardy不等式.利用向量场的非交换运算导出了Pohozaev恒等式.这些结果均推广了Folland,Garofalo-Lanconelli已有的结果,而方法... 详细信息

本文对Heisenberg群Hn上的p次Laplace算子ΔHn,p构造了基本解,建立了关于基向量场的Picone恒等式,进而建立了Hardy不等式.利用向量场的非交换运算导出了Pohozaev恒等式.这些结果均推广了Folland,Garofalo-Lanconelli已有的结果,而方法则有所改进.最后给出了在非线性次椭圆方程中的应用.

关键词：基本解 Picone恒等式 Heisenberg群 Hardy不等式 Pohozaev恒等式

The determination of larval metamorphic competence of Styela canopus Savigny

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2003年第3期22卷 459-466页

作者： Caihuan Ke hawaii.edu. +Corresponding author e-mail: chke *** Department of Oceanography Institute of Subtropic Oceanography Key Laboratory for Marine Environmental Science of the Ministry of Education Xiamen University Xiamen 361005 China. E-mail:yinghuan

The larvae of Styela canopus show the highest rates of settlement and metamorphosis when treated with 40 mM KCl-elevated seawater at 25 degreesC in temperature and 27.0 in salinity. Induced by 40 mM KCl-elevated seawater, it took Styela canopus larvae approximately 3 h after hatching to develop competence to settle and metamorphose. The present experiment shows that Styela canopus larvae is an ideal model organism for examining the efficiency of antifouling substance.

关键词： Styela canopus larvae settlement metamorphosis ascidian

On existence of almost periodic solution of Ginzburg-Landau equation

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 2000年第2期5卷 74-79页

作者： Boling GUO and Rong YUAN (Institute of Applied Physics and Computational Mathernatics, Beijing 100088, China e-mail: gbl@mail. iapcm. ac. cn) Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper, we study the Ginzburg-Landau equation μt =αou + αiμxx + α2|μ|2μ +α3|μ|μ +f. The existence of almost periodic solution of the equation is proved when f （t, x） is an almost periodic function a... 详细信息

关键词： Ginzburg-Landau equation almost periodic function almost periodic solution

A ReMARK ON THe HeNSeLIZATION OF A ReGULAR LOCAL RING

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1999年第1期20卷 63-64页

作者： C. GALINDO(Department of Mathematics(eSTCe)),UJI,Campus P.Roja,12071,Castellon ,Spain.e-mail:galindo@mail.uji.es UJI Dept Math ESTCE Castellon 12071 Spain

The author gives simple characterization of the Henselization of an excellent regular localring.

关键词： Regular local ring Local Henselian ring Characterization

existence of periodic solutions of the generalized Ginzburg-Landau equation with periodic boundary condition

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 2000年第2期5卷 69-73页

作者： Boling GUO and Rong YUAN (Institute of Applied Physics and Computattonal Mathematics, Beijing 100088, China, e-mail: gbl@mail. iapcm. ac. Cn Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper, we study the periodic solution of the generalized Ginzburg-Landau equation by Galerkin method. We show the existence of periodic solution of this equation under appropriate conditions.

关键词： generalized Ginzburg-Landau equation Galerkin method periodic solution

THe ReALIZATION OF MULTIPLIeR HILBeRT BIMODULe ON BIDUAL SPACe AND TIeTZe eXTeNSION THeOReM

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2000年第3期21卷 375-380页

作者： FANG XIAOCHUN(Department of Mathematics, Tongji University, Shanghai 200092, China) e-mail: xfang@*** Department of Mathematics Tongji University Shanghai 200092 China

The multiplier bimodule of Hilbert bimodule is introduced in a way similar to [1], and its realization on a quotient of bidual space and Tietze extension theorem are obtained similar to that in C-algebra case. As a re... 详细信息

关键词： Realization on bidual space Multiplier Hilbert bimodule Tietze extension theorem

Dissipative Transitions between Bloch Bands

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1999年第4期15卷 363-365页

作者： Xangeng ZHAO(Institute of Applied Physics and Computational Mathematics, Beijing 100088, China)e-mail:zhaoxg@*** Inst Appl Phys & Computat Math Beijing 100088 Peoples R China

We study the effect of dissipative transport of two-band systems in a static electric field. With the help of numerical solutions of a stochastic Liouville equation for the density matrix, we find that the Markoffian dephasing will take electrons which are initially located in one band to equal population of the two bands, instead of undergoing Zener resonance, as they do in the absence of scattering.

关键词： Rev Dissipative Transitions between Bloch Bands

SOMe NeW FAMILIeS OF FILTRATION FOUR IN THe STABLe HOMOTOPY OF SPHeReS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1999年第1期20卷 93-102页

作者： LIN JINKUN(Department of Mathematics,Nankai University,Tianjin 300071,China e-mail:jklin@***) Nankai Univ Dept Math Tianjin 300071 Peoples R China

This paper proves the existence of 4 families of nontrivial homotopy elements in the stablehomotopy of spheres which are represented by in the ternis of the Adams spectral sequence respectively, where and are thekno... 详细信息

关键词： Stable homotopy of spheres Adams spectral sequence Derivations ofmaps M-module spectra

Stream-vorticity NS equation ADI Scheme to Investigate Properties of Impulsively Started Translatory Flows Around the Rotational Circular Cylinder without Wall Vorticity Conditions

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1998年第4期3卷 221-232页

作者： Caimao LUO and Xuequan e (Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China)e-mail: lcm@*** exq@*** Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

The properties of flow around a circular cylinder impulsively started into translatory and rotatory motion with rotational parameter a less than or equal to 8.0 and Reynolds number Re=100 and 200 are investigated in the present paper. The vorticity and stream function N-S equations are adopted here, with a 2nd-order spatial and temporal accuracy ADI (alternating direction implicit) scheme. Moreover the wall vorticityobtain through the principle of conservation of the total computational domain vorticityis determined by domain vorticity and stream function, therefore, through the wall vorticity iteration, the wall vorticity condition is not fixed during the time step. And the present model results indicate: (1) when α >4.0, vortex street suppression is obvious for the computational period (t e Re numbers here studied; (2) the higher the a number for the same Reynolds number, the slower the upper main vortex proceeds; (3) the maximum instantaneous transverse coefficient exceeds the limitation 4π.

关键词： wake vortex shedding mode rotation and translation ADI wall vorticitycondition.