模糊数值函数Henstock积分的收敛定理

给出模糊数值函数Henstock积分的收敛定理,特别给出了Kaleva积分的收敛定理,该结果推广了Kaleva积分以前若干个收敛定理。     

DC规划的一个对偶定理

本文给出了DC规划的直接对偶定理和逆对偶定理。作为特例,它们蕴涵了符号几何规划的对偶定理,最后给出一个数值例子来说明定理。1.引言     

多变时滞Volterra系统零解的稳定性

分析了一类多变时滞Volterra系统.采用Banach不动点定理,并在一定条件下构造适当的压缩映射,得到了系统零解稳定性定理.所得定理改进了已有文献中的结论,并对该定理给出严格证明.最后,通过数值仿真实例验证了结论的有效性.     

矩阵广义逆新的扰动上界

利用矩阵的奇异值分解方法,研究了矩阵广义逆的扰动上界,得到了在F-范数下矩阵广义逆的扰动上界定理,所得定理推广并彻底改进了近期的相关结果.相应的数值算例验证了定理的有效性.     

模糊数值函数Henstock积分的原函数刻画

给出了模糊数值函数Henstock积分的原函数刻画定理,从而给出了模糊数值函数Henstock积分的描述性定义。     

一类具有状态依赖时滞的基因表达模型的分支分析

研究了一类具有状态依赖时滞的基因表达模型的Hopf分支问题.基于Rouche定理和Hopf分支定理,选取状态依赖时滞τ作为分支参数,发现当τ通过一系列临界值时,系统出现了Hopf分支.最后,对系统进行了数值仿真,数值仿真的结果验证了理论分析的正确性.     

一类随机偏差定理与母函数方法

本文利用对数似然比的概念研究非负整数值随机变量序列的极限性质,得到一类随机偏差定理,即用不等式表示的一类强极限定理,其偏差界依赖于样本点．证明中提出了将母函数的工具应用于强极限定理研究的一种途径．     

高速取样定理

1948年Shannon给出了著名的适用于频谱有限函数的取样定理，从而使信号传输数字化成为可能，但是Shannon取样定理收敛慢等缺点已经不能满足通信技术的高速发展，本文在Shannon取样定理的基础上，选择新的取样定理函数，构造了具有收敛速度快，数值计算简单等优点的高速取样定理。     

非绝对模糊积分,绝对可积性与积分的绝对值不等式

关于模糊数值函数的绝对可积性及对应的积分不等式,无论在何种绝对值意义下是值得讨论的. 本文借助于模糊数空间到具体的 Banach 空间上的嵌入定理和模糊非绝对积分的刻划定理, 讨论了模糊数值函数的绝对可积性及对应的积分不等式,得到了若干个充分必要条件, 并举出了一些反例.     

关于多元奇异积分逼近的一个定理

本文给出了多元奇异积分逼近的一个定理，并给出了数值例．     

Introducing a modified gradient vector method for optimization of accident prediction non-linear functions

In this paper, a new optimization method has been proposed for accident prediction non-linear models. This has been achieved by eliminating the Hessian matrix from the equation of optimal pace length in the gradient vector method. One advantage is that it is independent of the starting point in optimization processes and it provides convergence at the highest top as well. This method has been tested on an accident prediction model and its preference over the gradient vector method has been proven.     

On One method for the numerical solution of a system of parabolic equations

An algorithm for the numerical solution of a system of two parabolic equations of a special form has been presented, and its stability has been proved. Estimates of the numerical solutions obtained have been made. Conditions guaranteeing the applicability of the sweep method are determined, and the time step at which the iterative method has the inner convergence has been estimated. An example of the application of the algorithm in soil science has been presented.     

Operator splitting for numerical solutions of the RLW Equation

In this study, the numerical behavior of the one-dimensional Regularized Long Wave (RLW) equation has been sought by the Strang splitting technique with respect to time. For this purpose, cubic B-spline functions are used with the finite element collocation method. Then, single solitary wave motion, the interaction of two solitary waves and undular bore problems have been studied and the effectiveness of the method has been investigated. The new results have been compared with those of some of the previous studies available in the literature. The stability analysis has also been taken into account by the von Neumann method.     

病态线性方程组的判定方法

针对用条件数来衡量方程组的性态将随阶数增大而变得异常困难这一问题,分析了病态线性方程组产生的原因,提出了一种判定方法,探讨了对一定精度要求的解的可允许扰动的数量级,实例证明了这种方法的有效性.     

Solution of nonlinear fractional differential equations using homotopy analysis method

In this article, the homotopy analysis method has been applied to solve nonlinear differential equations of fractional order. The validity of this method has successfully been accomplished by applying it to find the solution of two nonlinear fractional equations. The results obtained by homotopy analysis method have been compared with those exact solutions. The results show that the solution of homotopy analysis method is good agreement with the exact solution.     

Classification of qualitative data

A method has been described for classifying a collection of items characterized by qualitative attributes. The method uses mainly two concepts, typicality and similarity. The first of these has been derived by applying information-theoretical tools to the data. Typicality is a relation of one item to the whole collection. Similarity is a one-to-one relation between two items and depends on the number of common properties shared by them.The method has been programmed for the IBM 1620 computer.     

Symmetric marching technique for the poisson equation. I. Dirichlet boundary conditions

The symmetric marching technique has been developed to solve the Poisson equation with Dirichlet boundary conditions. The method has been combined with a mesh refinement technique, which is used as an appropriate interpolation scheme to obtain a solution of the problem on finer grids. The effectiveness of the method has been demonstrated by solving some test examples.     

Application of the novel (<Emphasis Type="Italic">G</Emphasis>′/<Emphasis Type="Italic">G</Emphasis>)-expansion method to construct traveling wave solutions to the positive Gardner-KP equation

The novel (G′/G)-expansion method is one of the powerful methods accredited at the present time for establishing exact traveling wave solutions to nonlinear evolution equations (NLEEs). In this article, the method has been implemented to find the traveling wave solutions to the positive Gardner-KP equation. The efficiency of this method for finding exact and traveling wave solutions has been demonstrated. The obtained solutions have been compared with the solution obtained by other methods. The solutions have also been demonstrated by figures. It has been shown that the method is straightforward and an effective tool for solving NLEES that occur in applied mathematics, mathematical physics, and engineering.     

Numerical solutions of the coupled Burgers’ equation by the Galerkin quadratic B‐spline finite element method

In this paper, a coupled Burgers’ equation has been numerically solved by a Galerkin quadratic B‐spline FEM. The performance of the method has been examined on three test problems. Results obtained by the method have been compared with known exact solution and other numerical results in the literature. A Fourier stability analysis of the method is also investigated. Copyright © 2013 John Wiley & Sons, Ltd.     

The use of X-ray anomalous scattering in structure analysis of centrosymmetric crystals

An anomalous dispersion method for determining the signs of centrosymmetric reflections using data collected with two wavelengths has been suggested. The method gives the scale factor and the signs of the structure amplitudes simultaneously. An extension of this method to neutron anomalous dispersion has also been suggested.