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HYDROGEN-VACANCY INTERACTION IN IRON

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Acta Metallurgica Sinica(English Letters) 1995年第3期8卷 181-184页

作者： WANG Xiaogang(hunan Normal university, {{2.. china hunan Normal Univ Changsha China

The discrete variational method (DVM)and cluster model are used to study the electronic structure and atomic configuration of the hydrogen-vacancy complex in *** optimum location of hydrogen atom in the monovacancy in iron is determined by minimizing the total energy and the bond characteristic between hydrogen and iron atoms is analyzed Meanwhile, the positron annihilation characteristics of the hydrogen -vacancy complex is also calculated.

关键词： vacancy hydrogen-vacancy complex positron annihilation iron

Frequency characteristic of series piezoelectric sensor and application to the determination of water in organic solvents

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Chinese Journal of Chemistry 1994年第1期12卷 58-65页

作者： SHEN, Da-Zhong ZHU, Wen-Hong NIE, Li-Hua YAO, Shou-Zhou New Material Research Institute, hunan university, changsha, {{2. 410082. china New Material Research Institute Hunan University Changsha Hunan 410082 China

Theoretical consideration was proposed for the frequency response of a series piezoelectric sensor to the properties of liquid and verified experimentally. This kind of sensor has sensitive and selective frequency response to the permittivity and specific conductivity of solution with excellent stability, and was applied to the determination of micro-content of water in organic solvents. The detection limit is 0.01 g/L in dioxane.

关键词： Piezoelectric quartz crystal chemical sensor micro-water-content

Novel thin plate element theory based on a continuity re-relaxed technique

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Science china(Technological Sciences) 2010年第9期53卷 2450-2457页

作者： CUI XiangYang,LI GuangYao & ZHENG Gang State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,hunan university,{{2. 410082.china State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University

Thin plate problem has been receiving much interest due to its wide application in *** this paper,a novel thin plate element theory is proposed based on a continuity re-relaxed technique to avoid the high continuity requirement for thin plate formulation which needs the high computation *** problem is first discretized into a set of background cells with field nodes,and only deflection field is treated as the field *** top of the background cells,the integration domains are further *** curvatures over integration domains are restructured through the divergence theorem,and the continuity requirement of the trial deflection function for thin plate problems can be *** Galerkin weak form is then used to create the discretized system *** curvatures in the integration domains are constant,and the stiffness matrix of the system can be computed directly without numerical *** rotational essential boundary conditions are imposed in the process of curvature field *** numerical examples are computed using the RPIM approximation *** excellent results demonstrate the efficiency of the proposed method.

关键词： thin plate problem continuity re-relaxed curvature field restructured Galerkin weak form

Stability Caused by Impulses for Delay Difierential Equations

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Acta Mathematica Sinica,English Series 1997年第2期13卷 193-198页

作者： Yu Jianshe (Department of Applied Mathematics,hunan university,{{2. 410082.china)

In the present paper sufficient conditions are obtained for the stability of the zero solution of a nonlinear delay differential equation caused by impulses.

关键词： Delay differential equation Stability Impulse

Prediction of the amount of urban waste solids by applying a gray theoretical model

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Journal of Environmental Sciences 2003年第1期15卷 43-46页

作者： LI Xiao ming, ZENG Guang ming, WANG Ming, LIU Jin jin (Department of Environmental Science and Technology, hunan university, changsha 410082. china. Department of Environmental Science and Technology Hunan University Changsha 410082 China

Urban waste solids are now becoming one of the most crucial environmental problems. There are several different kinds of technologies normally used for waste solids disposal, among which landfill is more favorable in china than others, especially for urban waste solids. Most of the design works up to now are based on a roughly estimation of the amount of urban waste solids without any theoretical support, which lead to a series problems. To meet the basic information requirements for the design work, the amount of the urban waste solids was predicted in this research by applying the gray theoretical model GM (1,1) through non linear differential equation simulation. The model parameters were estimated with the least square method (LSM) by running a certain MATALAB program, and the hypothesis test results show that the residual between the prediction value and the actual value approximately comply with the normal distribution N (0,0 2. 2., and the probability of the residual within the range (-0 17, 0 19) is more than 95%, which indicate obviously that the model can be well used for the prediction of the amount of waste solids and those had been already testified by the latest two years data about the urban waste solids from Loudi City of china. With this model, the predicted amount of the waste solids produced in Loudi City in the next 30 years is 8049000 ton in total.

关键词： gray theoretical model prediction waste solids

Bank's Self-learning Process in a Gray System of Credit Risk

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Journal of Systems Science and Systems Engineering 2001年第4期13卷 457-462页

作者： CHAO Jian-xiong Business School, hunan university, changsha 410082. china Business School Hunan University Changsha 410082 China

A bank had better ration its credit if it first enters a gray system of credit information where it cannot distinguish between the low- and high-risk borrowers. As the bank keeps a long-term relationship with its borrowers the bank learns about the borrowers through time. With the help of logit model and Bayes ruIe, a bank can process customer's credit information and build a better credit term it gives.

关键词： credit rationing logit model Bayes rule

Aspects of recent developments in analytical chemometrics

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Science china Chemistry 2006年第3期49卷 193-203页

作者： LIANG Yizeng1,2. WU Hailong1, SHEN Guoli1, JIANG Jianhui1, LIANG Sheng2.& YU Ruqin1 1. State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering,{2., changsha 410082. china 2. Research Center of Modernization of Traditional Chinese Medicines, Central South {2., changsha 410081, china State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha China Research Center of Modernization of Traditional Chinese Medicines Central South University Changsha China

Some aspects of recent developments in analytical chemometrics are discussed, in par- ticular the developments viewed from the angle of the research efforts undertaken in authors’ labora- tories. The topics concerned include resolution of high-order chemical data, morphological theory and methodology for chemical signal processing, multivariate calibration and chemical pattern recognition for solving complex chemical problems, and resolution of two-way chemical data from hyphenated chromatographic instruments.

关键词： chemometrics, high-order chemical data, pattern recognition, multivariate calibration and resolution.

BASIC ELECTROLYTIC METHOD FOR RECOVERY OF LEAD FROM SCRAP BATTERIES

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中国有色金属学会会刊：英文版 1996年第4期6卷 47-51页

作者： Chen Weiping Tian Yizhuang Bian Kejun Zheng Yue(Institute for Environmental Protection,hunan university,{{2. 410082. Institute for Environmental Protection Hunan University Changsha 410082 China Xiongdong Chemical Machinery Factory

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关键词： battery sludge lead recovery electrowinning

BROYDEN'S METHOD FOR SOLVING VARIATIONAL INEQUALITIES WITH GLOBAL AND SUPERLINEAR CONVERGENCE

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Journal of Computational Mathematics 2000年第3期18卷 289-304页

作者： Yu-fei Yang Dong-hui Li (Department of Applied Mathematics, Hnnan university, changsha 410082. china) 湖南大学湖南长沙 410082

In this paper, we establish a quasi-Newton method for solving the KKT system arising from variational inequalities. The subproblems of the proposed method are lower-dimensional mixed linear complementarity problems. A suitable line search is introduced. We show that under suitable conditions, the proposed method converges globally and superlinearly.

关键词： Variational inequality quasi-Newton method global convergence,superlinear convergence