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Impact chaos control and stress release——A key for development of ultra fine vibration milling

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Progress in Natural science:Materials International 2002年第5期12卷 18-23页

作者： WANG Shulin(Department of Power Engineering, university of shanghai for science and technology, shanghai 200093, China) shanghai Univ Sci & Technol Dept Power Engn Shanghai 200093 Peoples R China

Through our previous experimental and analytical studies, it has been discovered that the key for the development of vibration milling is the impact chaos control and stress release. The necessities for the chaos control and stress release are: (i) to strictly e-liminate the sub-harmonics; (ii) to control the super-harmonics to a lower level and (iii) to load the system compressively with relatively higher period, in order that the vibration energy can be absorbed by the particles effectively and sufficiently. A new vibration model for ultra fine milling is proposed, which has wide applications in preparing ultra fine particles.

关键词： vibration mills ultra fine milling impact chaos control stress release.

DOUBLE S-BREAKING CUBIC TURNING POINTS AND THEIR COMPUTATION

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Journal of Computational Mathematics 1996年第1期14卷 8-22页

作者： R.S. Ye Z.H. Yang(Department of Mathematics, shanghai university of science and technology, shanghai,China) shanghai UNIV SCI & TECHNOL DEPT MATHSHANGHAI 201800PEOPLES R CHINA

In the paper we are concerned with double S-breaking cubic turning points of two-parameter nonlinear problems in the presence of Z(2)-symmetry. Three extended systems are proposed to determine double S-breaking cubic turning points. We show that there exist two kinds of singular point path passing through double S-breaking cubic turning point, One is the simple quadratic turning point path, the other is the pitchfork bifurcation point path.

关键词： DOUBLE S-BREAKING CUBIC TURNING POINTS AND THEIR COMPUTATION Pro

FOURIER PSEUDOSPECTRAL-FINITE DIFFERENCE METHOD FOR INCOMPRESSIBLE FLOW

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Journal of Computational Mathematics 1994年第4期12卷 312-329页

作者： Guo Ben-yu Xiong Yue-shan(shanghai university of science and technology, shanghai, China ) shanghai UNIV SCI & TECHNOL SHANGHAIPEOPLES R CHINA

A Fourier pseudospectral-finite difference scheme is proposed for unsteady Navier-Stokes equation. It is showed that the numerical solution keeps semi-discrete conservation. The strict error estimation is established.... 详细信息

关键词： Math FOURIER PSEUDOSPECTRAL-FINITE DIFFERENCE METHOD FOR INCOMPRESSIBLE FLOW

Nonsmooth Equations of K-T Systems for a Constrained Minimax Problem

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Journal of Systems Engineering and Electronics 2003年第2期14卷 31-35页

作者： Gao Yan School of Management, university of shanghai for science and technology, shanghai 200093, P. R. China School of Management University of Shanghai for Science and Technology Shanghai 200093 P. R. China

Using K-T optimality condition of nonsmooth optimization, we establish two equivalent systems of the nonsmooth equations for the constrained minimax problem directly. Then generalized Newton methods are applied to solve these systems of the nonsmooth equations. Thus a new approach to solving the constrained minimax problem is developed.

关键词： Optimization Minimax problems Nonsmooth equations Generalized Newton methods.

PARALLEL NONLINEAR MULTISPLITTING RELAXATION METHODS

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Applied Mathematics(A Journal of Chinese Universities) 1995年第3期10卷 251-266页

作者： WANG DEREN AND BAI ZHONGZHI(Department of Mathematics, shanghai university of science and technology, shanghai 201800). Department of Mathematics Shanghai University of Science and Technology Shanghai

By further generalizing Frommer's results in the sense of nonlinear multisplitting, we build a class of nonlinear multisplitting AOR-type methods, which covers many rather practical nonlinear multisplitting relaxation methods such as multisplitting AOR-Newton method, multisplitting AOR-chord method and multisplitting AOR-Steffensen method, etc.. Furthermore,a general convergence theorem for the nonlinear multisplitting AOR-type methods and the local convergence for the multisplitting AOR-Newton method are discussed in detail.A lot of numerical tests show that our new methods are feasible and satisfactory.

关键词： Nonlinear system of equations,nonlinear multisplitting,relaxed method local convergence

Cauchy Problem for Quasilinear Hyperbolic Systems with Higher Order Dissipative Terms

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Acta Mathematicae Applicatae Sinica 2003年第1期19卷 71-82页

作者： Wei-guo ZhangDepartment of Basic sciences, university of shanghai for science and technology, shanghai 200093, China Department of Basic sciences University of Shanghai for Science and Technology Shanghai China

Abstract In this paper, the author studies the global existence, singularities and life span of smooth solutions of the Cauchy problem for a class of quasilinear hyperbolic systems with higher order dissipative terms ... 详细信息

关键词： Keywords Cauchy problem Dissipative term Genuinely nonlinear Linearly degenerate

Enhanced activity of yqhD oxidoreductase in synthesis of 1,3-propanediol by error-prone PCR

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Progress in Natural science:Materials International 2008年第12期18卷 1519-1524页

作者： Hongmei Li~a Jia Chen~a Yinghua Li~b a Institute of Food science and Biological technology,university of shanghai for science and technology,shanghai 200093,China b Institute of Pharmaceutical Engineering,Zhejiang university,Hangzhou 310027,China [a]Institute of Food science and Biological technology University of Shanghai for Science and Technology Shanghai 200093 China [b]Institute of Pharmaceutical Engineering Zhejiang University Hangzhou 310027 China

yqhD oxidoreductase was determined to be an NADP-dependent dehydrogenase,and was more active toward 3-HPA when compared to 1,3-propanediol *** further improve enzyme activity towards 3-hydroxypropionaldehyde (3-HPA),error-prone PCR was implemented to mutant yqhD *** mutants,D99QN147H and Q202A with increased catalytic and affinity efficiency,were obtained after one round of error-prone polymerase chain *** the catalytic efficiency of the mutant D99QN147H was up to 4-fold greater than the wild enzyme (0.0375 min-1mM-1vs.0.0078 min-1mM-1).The recombined strain containing pEY28yqhD D99QN147H yielded 28 g L-1of 1,3-propanediol in the fed-batch LB cultures (1 L volume) with an initial 3-HPA concentration of 40 g L-1,which was higher than the 21 and 17 g L-1of 1,3-propanediol from the mutant Q202A and the wild-type,*** for propionaldehyde,the optimal mutant D99QN147H also exhibited higher activity on a range of substituted aldehydes than the wild- type.

关键词： yqhD oxidoreductase Error-prone PCR Catalytic efficiency 1,3-Propanediol

FOURIER　PSEUDOSPECTRAL－FINITE　DIFFERENCE　METHOD　FOR　TWO－DIMENSIONAL　VORICITY　EQUATION

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Chinese Annals of Mathematics,Series B 1994年第4期15卷 469-488页

作者： GUO BENYU XIONG YUESHAN(Department of Mathematics,shanghai university of science and technology f shanghai 201800,China.) DepartmentofMathematics ShanghaiUniversityofScienceandTechnologyShanghai201800China

A Fourier pseudospectral-finite difference sheme is proposed for solving two-dimensionalvorticity equations. The generalized stability and the convergence are *** numericalresults are given.

关键词： Vorticity equation Fourier pseudospectral-finite difference method Generalized stability Convergence.

COMBINED FINITE ELEMENT AND PSEUDOSPECTRAL METHOD FOR THREE-DIMENSIONAL VORTICITY EQUATIONS

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Journal of Hydrodynamics 1990年第3期2卷 75-87页

作者： Ma He-ping,Guo Ben-yu shanghai university of science and technology,shanghai 201800,P.R.China

A eombined finite element and pseudospectral method with a control operator is presented for three-dimension- al vorticity *** generalized stability of the scheme is proved and L^2-optimal estimation is obtained.

关键词： vorticity tangential Approximation satisfy 一彻 vertex 石合 interpolation radius 五如