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Search Results: 1 - 10 of 38299 matches for " Shan Jia-Fang "
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Spatially Nonhomogeneous Periodic Solutions in a Delayed Predator-Prey Model with Diffusion Effects
Jia-Fang Zhang
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/856725
Abstract: This paper is concerned with a delayed predator-prey diffusion model with Neumann boundary conditions. We study the asymptotic stability of the positive constant steady state and the conditions for the existence of Hopf bifurcation. In particular, we show that large diffusivity has no effect on the Hopf bifurcation, while small diffusivity can lead to the fact that spatially nonhomogeneous periodic solutions bifurcate from the positive constant steady-state solution when the system parameters are all spatially homogeneous. Meanwhile, we study the properties of the spatially nonhomogeneous periodic solutions applying normal form theory of partial functional differential equations (PFDEs).
Experimental study of large power lower hybrid current drive on HT-7 tokamak
HT-7托卡马克大功率低混杂波电流驱动的实验研究

Xu Qiang,Gao Xiang,Shan Jia-Fang,Hu Li-Qun,Zhao Jun-Yu,
徐强
,高翔,单家方,胡立群,赵君煜

物理学报 , 2009,
Abstract: 在HT-7超导托卡马克成功进行了大功率(PLHW=100—800 kW,f=2.45 GHz)低混杂波电流驱动实验.研究了不同入射功率和等离子体密度下的低混杂波电流驱动效率.获得了以平均电子密度增加、氘阿尔法(Dα)线辐射减少为特征的粒子约束改善;粒子约束时间τp增加了约1.5倍.仔细研究了能量约束时间与等离子体密度和低混杂波功率的关系.
A potential integration method for Birkhoffian system

Hu Chu-Le,Xie Jia-Fang,

中国物理 B , 2008,
Abstract: This paper is intended to apply the potential integration method to the differential equations of the Birkhoffian system. The method is that, for a given Birkhoffian system, its differential equations are first rewritten as 2n first-order differential equations. Secondly, the corresponding partial differential equations are obtained by potential integration method and the solution is expressed as a complete integral. Finally, the integral of the system is obtained.
Investigation of lower hybrid current drive during H-mode in EAST tokamak

Li Miao-Hui,Ding Bo-Jiang,Kong Er-Hu,Zhang Lei,Zhang Xin-Jun,Qian Jin-Ping,Yan Ning,Han Xiao-Feng,Shan Jia-Fang,Liu Fu-Kun,Wang Mao,Xu Han-Dong,Wan Bao-Nian,

中国物理 B , 2011,
Abstract:
Mei symmetry and Mei conserved quantity of nonholonomic systems with unilateral Chetaev type in Nielsen style

Jia Li-Qun,Xie Jia-Fang,Luo Shao-Kai,

中国物理 B , 2008,
Abstract: This paper studies the Mei symmetry and Mei conserved quantity for nonholonomic systems of unilateral Chetaev type in Nielsen style. The differential equations of motion of the system above are established. The definition and the criteria of Mei symmetry, loosely Mei symmetry, strictly Mei symmetry for the system are given in this paper. The existence condition and the expression of Mei conserved quantity are deduced directly by using Mei symmetry. An example is given to illustrate the application of the results.
Form invariance and Hojman conserved quantity of Maggi equation
Maggi方程的形式不变性与 Hojman守恒量

Hu Chu-Le,Xie Jia-Fang,
胡楚勒
,解加芳

物理学报 , 2007,
Abstract: This paper studies the form invariance of Maggi equation. Its definition and criterion are presented. A Hojman conserved quantity can be deduced using the form invariance. An example is given to illustrate the application of the result.
A New Conserved Quantity Corresponding to Mei Symmetry of Tzenoff Equations for Nonholonomic Systems

ZHENG Shi-Wang,XIE Jia-Fang,CHEN Wen-Cong,

中国物理快报 , 2008,
Abstract: A new conserved quantity is investigated by utilizing the definition anddiscriminant equation of Mei symmetry of Tzenoff equations fornonholonomic systems. In addition, the expression of this conservedquantity, and the determining condition induced new conserved quantityare also presented.
Structure-preserving algorithms for the Duffing equation

Gang Tie-Qiang,Mei Feng-Xiang,Xie Jia-Fang,

中国物理 B , 2008,
Abstract: In this paper, the dissipative and the forced terms of the Duffing equation are considered as the perturbations of nonlinear Hamiltonian equations and the perturbational effect is indicated by parameter $\varepsilon $. Firstly, based on the gradient-Hamiltonian decomposition theory of vector fields, by using splitting methods, this paper constructs structure-preserving algorithms (SPAs) for the Duffing equation. Then, according to the Liouville formula, it proves that the Jacobian matrix determinants of the SPAs are equal to that of the exact flow of the Duffing equation. However, considering the explicit Runge--Kutta methods, this paper finds that there is an error term of order $pIn this paper, the dissipative and the forced terms of the Duffing equation are considered as the perturbations of nonlinear Hamiltonian equations and the perturbational effect is indicated by parameter $\varepsilon $. Firstly, based on the gradient-Hamiltonian decomposition theory of vector fields, by using splitting methods, this paper constructs structure-preserving algorithms (SPAs) for the Duffing equation. Then, according to the Liouville formula, it proves that the Jacobian matrix determinants of the SPAs are equal to that of the exact flow of the Duffing equation. However, considering the explicit Runge--Kutta methods, this paper finds that there is an error term of order $pIn this paper, the dissipative and the forced terms of the Duffing equation are considered as the perturbations of nonlinear Hamiltonian equations and the perturbational effect is indicated by parameter $\varepsilon $. Firstly, based on the gradient-Hamiltonian decomposition theory of vector fields, by using splitting methods, this paper constructs structure-preserving algorithms (SPAs) for the Duffing equation. Then, according to the Liouville formula, it proves that the Jacobian matrix determinants of the SPAs are equal to that of the exact flow of the Duffing equation. However, considering the explicit Runge--Kutta methods, this paper finds that there is an error term of order $pIn this paper, the dissipative and the forced terms of the Duffing equation are considered as the perturbations of nonlinear Hamiltonian equations and the perturbational effect is indicated by parameter $\varepsilon $. Firstly, based on the gradient-Hamiltonian decomposition theory of vector fields, by using splitting methods, this paper constructs structure-preserving algorithms (SPAs) for the Duffing equation. Then, according to the Liouville formula, it proves that the Jacobian matrix determinants of the SPAs are equal to that of the exact flow of the Duffing equation. However, considering the explicit Runge--Kutta methods, this paper finds that there is an error term of order $p$+1 for the Jacobian matrix determinants. The volume evolution law of a given region in phase space is discussed for different algorithms, respectively. As a result, the sum of Lyapunov exponents is exactly invariable for the SPAs propo
Weak Noether symmetry for nonholonomic systems of non-Chetaev type

Xie Jia-Fang,Gang Tie-Qiang,Mei Feng-Xiang,

中国物理 B , 2008,
Abstract: Based on the weak Noether symmetry proposed by Mei F X, this paper discusses the weak Noether symmetry for nonholonomic system of non-Chetaev type, and presents expressions of three kinds of conserved quantities by weak Noether symmetry. Finally, the application of this new results is showed by a practical example.
Database-based Document Management System and Its Enterprise Application
基于数据库的文档管理系统及其在企业中的应用

FU Jia-fang,ZHAO Bao-hua,
傅佳芳
,赵保华

计算机应用研究 , 2004,
Abstract: 讨论了基于数据库的文档管理系统的解决方案及其实现的关键技术,特别是通过 ADO 中的 Stream 对象对数据库中的文档资料进行读写,并结合某制造企业的工艺文档管理系统进行了分析。
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