检索结果-南通市图书馆

Modulation on the collective response behavior by the system size in two-dimensional coupled cell systems

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2006年第3期49卷 304-312页

作者： ZHANG Jiqian1, SHEN Chuansheng1,2 & CUI Zhifeng1 1. college of Physics and Electronic Information, Anhui Normal University, Wuhu 241000, china 2. department of Educational Technology, anqing teachers college, anqing 246011, china college of Physics and Electronic Information Anhui Normal University Wuhu China department of Educational Technology Anqing Teachers College Anqing China

By the intracellular calcium ionic minimal model proposed by Berridge, we investigated the collective response of two-dimensional (N×N) coupled cell systems to the external stimulation using numerical simulation methods. With a coupled intensity fixed and an appropriate coupled cell number chosen, the kinetic system size resonance was discovered. At the same time, it was found that the system size responding to the external stimulation for different coupled intensities transferred too, especially when the coupled intensity increased, the range of the corresponding system size extended. These phe- nomena illustrate that the coupled cell number and the coupled intensity can play con- structive roles in noisy coupled systems, by which the biology system would probably improve its capability to respond to the external stimulation.

关键词： cell coupling,collective response,system size resonance

DYNAMIC CHARACTERISTICS OF LIQUID SLOSHING IN A TRANSVERSELY VIBRATING SPHERICAL TANK WITH A SPACER UNDER LOW GRAVITY

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2008年第6期20卷 762-769页

作者： CHENG Xu-duo hu Mei-zhu WEN Ji-hua School of Food Science and Engineering Nanjing University of Finance and Economics Nanjing 210003 China department of Physics Anqing Teachers College Anqing 246011 China

The dynamic characteristics of liquid sloshing in a transversely vibrating spherical tank with spacer under low gravity were investigated. By expanding the characteristic functions, the frequencies and velocity potentials of liquid free-sloshing were obtained. The dynamic equations and boundary conditions of liquid sloshing in the traverse vibrational spherical tank with spacer under low gravity were derived. By modifying the velocity potentials of liquid free-sloshing, the velocity potentials of liquid sloshing in the traverse vibrating spherical tank with a spacer were obtained. Furthermore, the forces and the moments acting on tank wall were given. The numerical results show when a spacer is inserted in the tank, the sloshing frequencies of liquid and the forces acting on tank wall will decrease, but the moment of force to the centre of the tank which is caused by the force of liquid acting on the spacer will occur.

关键词： low gravity liquid forced sloshing sloshing suppression

DYNAMIC CHARACTERISTICS OF LIQUID SLOSHING IN A RECTANGULAR TANK UNDER LOW GRAVITY

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2006年第2期18卷 170-176页

作者： CHENG Xu-duo hu Mei-zhu LIU Zhi-yun School of Food Science and Engineering Nanjing University of Finance and Economics Nanjing 210003 China department of Physics Anqing Teachers College Anqing 246011 China School of Food Science and Engineering Nanjing University of Finance and Economics Nanjing 210003 China

In this paper, the dynamics of liquid sloshing in a rectangular tank under low gravity was investigated. The basic frequencies and the velocity potentials of sloshing of liquid were obtained by expansion of the Fourier series. The characteristics of force and moment of the liquid acting on a rectangular tank were analyzed. The equivalent mechanical models of spring-vibrator-damper of sloshing of liquid were established with mechanical equivalent principle and numerical results were given. The numerical results show that the equivalent sloshing mass increases with the increase of gravity, and that the basic frequency and the equivalent sloshing mass increase with the increase of the liquid depth.

关键词： low gravity liquid sloshing equivalent mechanical model

On quasi-convex mappings of order α in the unit ball of a complex Banach space

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2006年第11期49卷 1451-1457页

作者： LIU Taishun & XU Qinghua department of mathematics, huzhou teachers college, huzhou, 313000, china department of mathematics, Jiangxi Normal University, Nanchang, 330022, china department of mathematics Huzhou Teachers College Huzhou China department of mathematics Jiangxi Normal University Nanchang China

In this paper, a class of biholomorphic mappings named quasi-convex mapping of order a in the unit ball of a complex Banach space is introduced. When the Banach space is confined to Cn, we obtain the relation between this class of mappings and the convex mappings. Furthermore, the growth and covering theorems of this class of mappings are given on the unit ball of a complex Banach space X. Finally, we get the second order terms coefficient estimations of the homogeneous expansion of quasi-convex mapping of order a defined on the polydisc in Cn and on the unit ball in a complex Banach space, respectively.

关键词： coefficient estimation the homogeneous expansion quasi-convex mapping quasi-convex mapping of order a.

Continuous embedding between harmonic Hardy spaces and mixed-norm spaces

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第2期42卷 106-108页

作者： hu Zhangjiandepartment of mathematics, huzhou teachers college, Zhejiang 313000, china department of mathematics Huzhou Teachers College Zhejiang China

LET D Rn be a bounded domain with C∞ boundary, and λ （x） be a defining function. This means that λ（x） is in C∞（Rn）, is bounded and |▽λ|≠0 in some neighborhood of aD （see ref. [1]）. For r positive and sufficiently small, set Dr = {x∈Rn; λ（x） r,and dσ be the （n-1）-dimensional Hausdorff measures on aD,={x∈Rn; λ（x） = -Υ} and on αD = {x∈Rn; λ（x） = 0} respectively, and dm be the Lebesgue volume element on Rn.By h（D） we will denote the space of all complex valued harmonic functions on D. For a multi-index α= （α1,α2…,αn）, aj being a non-negative integer, and x = （x1,x2,…,xn）∈D, write |α| = α1 + α2 + … + αn

关键词： harmonic Hardy space integral mean gradient.

BGP reflection functors in root categories

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2005年第8期48卷 1033-1045页

作者： XIAO Jie, ZHANG Guanglian1’2 & Zhu Bin department of Mathematical Sciences, Tsinghua University, Beijing 100084, china department of mathematics, Yancheng teachers college, Yancheng 224002, china department of Mathematical Sciences Tsinghua University Beijing China department of mathematics Yancheng Teachers College Yancheng China

We define the BGP-reflection functors in the derived categories and the root categories. By Ringel's Hall algebra approach, the BGP-reflection functor is applicable to obtain the classical Weyl group action on the Lie... 详细信息

关键词： m-cycle complexes, derived categories, BGP-reflections, Kac-Moody algebras.

Regularity of harmonic maps with the potential

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2006年第5期49卷 599-610页

作者： Chu Yuming & LIU Xiangao department of mathematics, huzhou teachers college, huzhou 313000, china Institute of mathematics, Fudan University, Shanghai 200433, china department of mathematics Huzhou Teachers College Huzhou China Institute of mathematics Fudan University Shanghai China

The aim of this work is to prove the partial regularity of the harmonic maps with potential. The main difficulty caused by the potential is how to find the equation satisfied by the scaling function. Under the assumption on the potential we can obtain the equation, however, for a general potential, even if it is smooth, the partial regularity is still open.

关键词： harmonic map, partial regularity, potential.

Asymptotic Convergence to Steady-State Solutions for Solutions of the Initial Boundary Problem to a Simplified Hydrodynamic Model for Semiconductor

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2000年第3期5卷 265-270页

作者： Ying Gu\|liang department of mathematics, Xianning teachers’ college, Xia nning 437005,china department of mathematics Xianning Teachers' College Xianning China

We studied the asymptotic behavior of solutions to the initial boundary value problem on the spatial interval [0,1] for a one-dimensional simplified gydrodynamic model for semiconductors wheng(t)→b *, and proved the unique global existence of smooth solutions to the initial boundary problem. We also show that the solutions converge to the corresponding steady-state solutions time-asymptotically by introducing the suitable shift functions.

关键词： semiconductor hydrodynamic model asymptotic convergence

基于广义Z_4线性Calderbank-McGuire码的对偶

在线全文

学校读者我要写书评

暂无评论

系统科学与数学 2004年第2期24卷 271-277页

作者：胡万宝中国科学技术大学数学系

本文讨论了广义Z4线性Calderbank-McGuire码的对偶的迹表示及2-adic表示, 同时给出了其最小Lee权估计.

关键词： Z4线性Calderbank-McGuire码对偶 Galois环权