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1488 Total, 149 Pages | << First < Previous 137 138 139 140 141 142 143 Next > Last >>

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	1. Unsteady shear flow of a viscoelastic fluid with the fractional Maxwell model in rectangular tube
	Haitao Qi,Mingyu Xu
	Mathematics 17 November 2005
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	Abstract:In this paper, the unsteady flow of a viscoelastic fluid with the fractional derivative Maxwell model in rectangular tube is studied. The exact solutions are then obtained for the equations characterizing flows of such fluids under an arbitrary pressure gradient by the method of integral transforms (Fourier cosine transform and Laplace transform). Two special cases are discussed: flow due to a constant pressure gradient and flow due to a periodic one.
	TO cite this article:Haitao Qi,Mingyu Xu. Unsteady shear flow of a viscoelastic fluid with the fractional Maxwell model in rectangular tube[OL].[17 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3678


	2. On $n$-semihereditary Rings and $n$-coherent Rings
	Xiaoxiang Zhang,Jianlong Chen
	Mathematics 14 November 2005
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	Abstract:Let $R$ be a ring. For fixed positive integer $n$, $R$ is said to be left $n$-semihereditary in case every $n$-generated left ideal is projective. $R$ is said to be weakly $n$-semihereditary if each $n$-generated left (and/or right) ideal is flat. Some properties of $n$-semihereditary rings, respectively, weakly $n$-semihereditary rings and $n$-coherent rings are investigated. It is also proved that $R$ is left $n$-semihereditary if and only if it is left $n$-coherent and weakly $n$-semihereditary, if and only if the ring of $n\times n$ matrices over $R$ is left 1-semihereditary if and only if the class of all $n$-flat right $R$-modules form the torsion-free class of a torsion theory. $R$ is left semihereditary if and only if it is left $n$-semihereditary for all positive integers $n$.
	TO cite this article:Xiaoxiang Zhang,Jianlong Chen. On $n$-semihereditary Rings and $n$-coherent Rings[OL].[14 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3631

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	3. Hysteresis and Precondition of Fractional-order Viscoelastic Solid Models
	Li Yan,Xu Mingyu
	Mathematics 07 November 2005
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	Abstract:In this paper the hysteresis and precondition of fractional-order viscoelastic solid models were studied under the condition of loading and unloading of saw-tooth wave. It contains the monotonic and limit property of hysteresis and precondition. It was shown that the hysteresis loop
	TO cite this article:Li Yan,Xu Mingyu. Hysteresis and Precondition of Fractional-order Viscoelastic Solid Models[OL].[ 7 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3535


	4. New Convergence Theorems of Homotopy Method for Constrained Non-convex Programming
	Wenjuan Sun,Qinhuai Liu
	Mathematics 04 November 2005
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	Abstract:In this paper, we use combined interior homotopy method to solve constrained non-convex programming. We get some results for homo- topy pathway. We also prove that, when the homotopy map is a regular map, the K-K-T point obtained from homotopy algorithm can
	TO cite this article:Wenjuan Sun,Qinhuai Liu. New Convergence Theorems of Homotopy Method for Constrained Non-convex Programming[OL].[ 4 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3510


	5. Sample size determined method using features of CV of the sampled population
	Yefeng Wu,Zifang Du
	Mathematics 03 November 2005
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	Abstract:In sampling design ,the necessary sample size often needs to be determined before the execution of the survey. Using the up limit of coefficient of variation (CV)of the sampled population to compute the needed approximate sample size is one of the most effective and convenient methods. In fact, to common populations , it does exist some up limits for their CVs. So, this paper aims to find these up limits of CV for them to facilitate the determination of the appropriate sample size in advance .
	TO cite this article:Yefeng Wu,Zifang Du. Sample size determined method using features of CV of the sampled population[OL].[ 3 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3489


	6. A Sequential Bundle Method for Solving a MPEC Problem
	Xia Zunquan,Shen Jie ,Pang Liping
	Mathematics 19 October 2005
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	Abstract:In this paper we consider a convex MPEC problem with a nondifferentiable convex objective function and constraints separable in two variable vectors whose second variable vector belongs to the set of optimal solutions of the constraint problem. A sequential bundle method for dealing with this kind of problem is presented. It is constructed by combining a proximal bundle method due to Hintermuller (2001) and a descent proximal level bundle method due to Brannlund, Kiwiel and Lindberg (1995). The first bundle method is used to provide a starting point at the beginning of each iteration of the sequential iterate process and the second one is used to find an (approximate) optimal solution of the constraint problem at each iteration of the sequential iterate process. The convergence analysis given in the last section shows that under some conditions the algorithm presented can terminate at an approximate solution in finite steps according to a given tolerance error.
	TO cite this article:Xia Zunquan,Shen Jie ,Pang Liping. A Sequential Bundle Method for Solving a MPEC Problem[OL].[19 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3308


	7. First Order Necessary Optimality Conditions for a Class of Nonsmooth Generalized Semi-Infinite Optimization Problems
	Pang Liping,Wang Mingzheng,Xia Zunquan
	Mathematics 19 October 2005
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	Abstract: In this paper, we study two classes of generalized semi-infinite nonsmooth optimization problems, One is the nonsmooth convex generalized semi-infinite programming problem. Another is the nonsmooth Lipschitz semi-infinite programming problem. First order necessary optimality conditions for these two kinds of problems are obtained using the differentiability properties of the optimal value functions or bounds for the directional derivatives of the optimal value function.
	TO cite this article:Pang Liping,Wang Mingzheng,Xia Zunquan. First Order Necessary Optimality Conditions for a Class of Nonsmooth Generalized Semi-Infinite Optimization Problems[OL].[19 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3307


	8. Narrow Hyper Imaginary Number and Generalized Hyper Imaginary Number
	Yang Renhu
	Mathematics 11 October 2005
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	Abstract:On the basis of the traditional imaginary number, the author puts forward the concept of narrow hyper imaginary number and generalized hyper imaginary number. It gives a new terse form like traditional imaginary number. Although it is just the advance of the concept, its meaning is very significant. Its characteristics need further study. Especially the problem of infinite is also discussed. Because of the complexity of infinite, it still is a difficulty in the domain of mathematics. In this paper, the author only gives elementary thinking about infinite. Infinite may be regarded as a set and every element in this set has a limit tending to infinity. The concept of natural infinite also be put forward on basis of it. Of course it is just a elementary idea and needs futher study.
	TO cite this article:Yang Renhu. Narrow Hyper Imaginary Number and Generalized Hyper Imaginary Number[OL].[11 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3200


	9. Orthogonal Fctorizations of Digraphs
	Liu Guizhen ,Zang Wen’an
	Mathematics 08 October 2005
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	Abstract: In this paper it is proved that every (mg+m-1, mf-m+1)-digraph has a (g,f)-factorization orthogonal to any given subdigraph with km arcs if k is not great than min {g-(x), g+(x)} for any x in V(G) and that every (mg,mf)-digraph has a (g,f)-factorization orthogonal to any given directed m-star if g(x) is between 0 and f(x) for any x in V(G). The results in this paper are in some sense best possible.
	TO cite this article:Liu Guizhen ,Zang Wen’an . Orthogonal Fctorizations of Digraphs[OL].[ 8 October 2005] http://en.paper.edu.cn/en_releasepaper/content/3143


	10. Exact Solution on Unsteady Couette Flow of Generalized Maxwell Fluid with Fractional Derivative
	Wang Shaowei ,Xu Mingyu
	Mathematics 28 September 2005
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	Abstract:In this paper the unsteady Couette flow of a generalized Maxwell fluid with fractional derivative (GMF) is studied. The exact solution is obtained with the help of integral transforms (Laplace transform and Weber transform) and generalized Mittag-Leffler function. It was shown that the distribution and establishment of the velocity is governed by two non-dimensional parameters , b and fractional derivative of the model. The result of classical (Newtonian fluid) Couette flow can be contained as a special case of the result given by this paper, and the decaying of unsteady part of GMF displays power law behavior, which has scale invariance.
	TO cite this article:Wang Shaowei ,Xu Mingyu . Exact Solution on Unsteady Couette Flow of Generalized Maxwell Fluid with Fractional Derivative[OL].[28 September 2005] http://en.paper.edu.cn/en_releasepaper/content/3071

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