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NUMERICAL ANALYSIS FOR A MEAN-FIELD EQUATION FOR THE ISING MODEL WITH GLAUBER DYNAMICS

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Journal of Computational Mathematics 1997年第3期15卷 203-218页

作者： Lu, bn Wan, GH SHAANXI NORMAL UNIV DEPT MATHXIANPEOPLES R CHINA

In this paper, a mean-field equation of motion which is derived by Penrose (1991) for the dynamic Ising model with Glauber dynamics is considered. Various finite difference schemes such as explicit Euler scheme, predictor-corrector scheme and some implicit schemes are given and their convergence, stabilities and dynamical properties are discussed. Moreover, a Lyapunov functional for the discrete semigroup {S}(n>0) is constructed. Finally, numerical examples are computed and analyzed. it shows that the model is a better approximation to Cahn-Allen equation which is mentioned in Penrose (1991).

关键词： Figure NUMERICAL ANALYSIS FOR A MEAN-FIELD EQUATION FOR THE ISING MODEL WITH GLAUBER DYNAMICS Math

THE GLOBAL DUFORT-FRANKEL DIFFERENCE APPROXIMATION FOR NONLINEAR REACTION-DIFFUSION EQUATIONS

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Journal of Computational Mathematics 1998年第3期16卷 275-288页

作者： Lu, bn Wan, GH Guo, BL Xiangtan Univ Inst Computat & Appl Math Xiangtan 411105 Peoples R China Inst Appl Phys & Computat Math Lab Computat Phys Beijing 100088 Peoples R China Shaanzi Normal Univ Dept Math Xian 710062 Peoples R China Inst Appl Phys & Computat Math Ctr Nonlinear Studies Beijing 100088 Peoples R China

In this paper, the initial value problem of nonlinear reaction-diffusion equation is considered. The Dufort-Frankel finite difference approximation for the long time scheme is given for the d-dimensional reaction-diffusion equation with the two different cases. The global solution and global attractor are discussed for the Dufort-Frankel scheme. Moreover properties of the solution are studied. The error estimate is presented in a finite time region and in the global time region for some special cases. Finally the numerical results for the equation are investigated for Allen-Cahn equation and some other equations and the homoclinic orbit is simulated numerically.

关键词： global Dufort-Frankel method reaction-diffusion equation global attractor error estimate numerical experiments

Reaction kinetic behavior of different carbon monoxide adspecies on palladium-alumina during oxidation: an in-situ IR study

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Chinese Journal of Chemistry 1995年第4期13卷 306-310页

作者： CAO, GY JIANG, bn CHINESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116023PEOPLES R CHINA

Carbon monoxide oxidation on Pd(10 w.t.%)-alumina was studied by in-situ infrared spectroscopy. It was found that the oxidation reactivities vary with different CO adspecies: linear COad > 2-fold bridged COad > multi-... 详细信息

关键词： CARBON MONOXIDE CATALYSIS OXIDATION KINETICS IN-SITU IR

A New Lignan Glucoside from Lancea tibetica

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Chinese Chemical Letters 1999年第1期10卷 37-38页

作者： Su, bn Yuan, CS Jia, ZJ Lanzhou Univ Natl Lab Appl Organ Chem Dept Chem Lanzhou 730000 Peoples R China

A new 7-9'-monoepoxy tetrahydrofuran type lignan glucoside with the cis-relationship of H-7 and H-8, named tibeticoside A 1, was isolated from the medicinal whole plants of Lancea tibetica. Its structure was elucidate... 详细信息

关键词： Lancea tibetica scrophulariaceae tibeticoside A

A New Nor-neolignan from Cremanthodium ellisii

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Chinese Chemical Letters 1999年第2期10卷 129-130页

作者： Su, bn Zhu, QX Jia, ZJ Lanzhou Univ Dept Chem Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China

A new nor-neolignan, named ellisinin A (1), has been isolated from the traditional Tibetan medicinal plants of Cremanthodium ellisii. Its structure has been determined on the basis of spectroscopic evidence, especiall... 详细信息

关键词： Cremanthodium ellisii compositae nor-neolignan ellisinin A

Studies on sulfinatodehalogenation:The reaction of polyfluoroalkyl iodides and bromides with sodium bisulfite

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Chinese Journal of Chemistry 1996年第4期14卷 373-376页

作者： Wu, FH Huang, bn Huang, WY CHINESE ACAD SCI SHANGHAI INST ORGAN CHEMSHANGHAI 200032PEOPLES R CHINA

Without oxidant, sodium bisulfite reacted with polyfluoroalkyl iodides and bromides in aqueous DMF solution to give the corresponding sulfinates in good yields.

关键词： sulfinatodehalogenation polyfluoroalkanesulfinates sodium bisulfite

TWONEW　TRITERPENOID　SAPONINS，ASTERBATANOSIDE　H　AND　I，FROM　ASTER　BATANGENSIS

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Chinese Chemical Letters 1995年第2期6卷 105-108页

作者： Shao, Y Zhou, bn Lin, LZ Cordell, GA Acad Sinica Shanghai Inst Mat Med Shanghai 200031 Peoples R China Univ Illinois Coll Pharm Dept Med Chem & Pharmacognosy Programm Collaborat Res Pharmaceut Sci Chicago IL USA

Two new triterpenoid saponins named asterbatanoside H and I have been isolated from the roots of Aster batsngensis and their structures elucidated as 3-O-β-D-glucopyranosyl-(1→3) β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosy-(1→6) and 3-O-β-D-glucopyranosyl-(1→3)-β-D-glucopyranosyl-23-O-acetyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6) β-D-glucopyranoside, respectively, by means of spectral and chemical data.

关键词： ASTERBATANOSIDE TRITERPENOID TWONEW FROM SAPONINS AND BATANGENSIS

Efficacy of a Memory Clinic for Patients with Memory Problems

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中国临床心理学杂志 2004年第4期12卷 417-419页

作者： Simon bn Thompson Clinical Psychology&Neuropsychology Services University of Portsmouth

本文对英格兰其切斯特的记忆诊所是否能适当地为Chichester,BognorRegis以及MidhurstlocalitiesoftheNHSTrust等地的门诊病人服务 ,以及将来可能发展到Crawley和Horshamlocalities(它们都是Trust区的一部分 )等问题作了探讨。文章报导... 详细信息

本文对英格兰其切斯特的记忆诊所是否能适当地为Chichester,BognorRegis以及MidhurstlocalitiesoftheNHSTrust等地的门诊病人服务 ,以及将来可能发展到Crawley和Horshamlocalities(它们都是Trust区的一部分 )等问题作了探讨。文章报导了小范围的重点研究 ,以及与同事们协商在临近地区建立类似记忆诊所等问题。结果表明。

关键词：英格兰记忆诊所切斯特门诊服务

THE STRUCTURE OF ASTERBATANOSIDE J FROM ASTER BATANGENSIS

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Chinese Chemical Letters 1995年第3期6卷 221-224页

作者： Shao, Y Zhou, bn Lin, LZ Cordell, GA Acad Sinica Shanghai Inst Mat Med Shanghai 200031 Peoples R China Univ Illinois Coll Pharm Dept Med Chem & Pharmacognosy Program Collaborat Res Pharmaceut Sci Chicago IL USA

A new medicagenic acid saponin named asterbatanoside J was isolated from the roots of Aster batangensis. On the basis of chemical and spectral studies especially 2D NMR including COSY, HETCOR, HOHAHA, ROESY and HMBC techniques, its structure has been established as 3-O-beta -D-glucopyranosyl-(1 -->6)-beta -D-glucopyranosyl-2 beta ,3 beta -dihydroxy-olean-12-en-23 alpha ,28-dioic acid-28-O-alpha -L-arabinopyranosyl-(1 -->3)-alpha -L-rhamnopyranosyl-(1 -->2)-beta -D-fucopyranoside.

关键词： ct^