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Stress Field Analyses of Functionally Gradient Ceramic Tool by FEM

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Journal of Materials Science & Technology 2001年第4期17卷 466-468页

作者： Ning FAN , Xing AI and Jun ZHAO Department of Mechanical Engineering, shandong University,jinan 250061, china shandong Univ Dept Mech Engn Jinan 250061 Peoples R China

The cutting properties of the functionally gradient ceramic cutting tools relate closely to the gradient distribution. A cutting model of the functionally gradient ceramic tool is firstly designed in the present paper... 详细信息

关键词： Stress Field Analyses of Functionally Gradient Ceramic Tool by FEM Tool

On the error term in Weyl’s law for the Heisenberg manifolds (Ⅱ)

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Science china Mathematics 2009年第5期52卷 857-874页

作者： ZHAI WenGuang School of Mathematical Sciences, shandong Normal University, jinan 2.0014, china 1. School of Mathematical Sciences Shandong Normal University Jinan 250014 China

In this paper we study the mean square of the error term in the Weyl's law of an irrational (2l + 1)-dimensional Heisenberg manifold. An asymptotic formula is established.

关键词： Heisenberg manifold Weyl’s law error term mean square

AN ANALYTICAL SOLUTION FOR THE MODEL OF DRUG DISTRIBUTION AND ABSORPTION IN SMALL INTESTINE

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Acta Mechanica Sinica 1990年第4期6卷 316-323页

作者： Xu Mingyu (Department of Mathematics,shandong University,jinan,250100,china) 1. Department of Mathematics Shandong University 250100 Jinan China

According to the physiological and anatomical characteristics of small intestine,neglecting the effect of its motility on the distribution and absorption of drug and nutrient,*** et *** a model of two-dimensional laminar flow in a circular porous tube with permeable wall and calculated the concentration profile of drugby numerical *** this paper,we give a steady-state analytical solution of the above model including *** obtained results are in agreement with the results of their numerical analysis. Moreover the analytical solution presented in this paper reveals the relation among the physiological parameters of the model and describes the basic absorption rule of drug and nutrient through the intestinal wall and hence pro- vides a theoretical basis for determining the permeability and reflection coefficient through in situ experiments.

关键词： drug and nutrient distribution and absorption in small intestine model and analytical solution

Study on mechanical parameters of fractured rock masses

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Science china(Technological Sciences) 2011年第S1期54卷 140-146页

作者： CHEN WeiZhong 1,2,YANG JianPing 1,TAN XianJun 1 &YU HongDan 1 1 State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,china 2 Research Center of Geotechnical and Structural Engineering,shandong University,jinan 250061,china 1. State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan 430071 China2. Research Center of Geotechnical and Structural Engineering Shandong University Jinan 250061 China

The equivalent strength parameters of fractured rock masses are prerequisite for stability analysis of geotechnical engineering projects constructed in fractured rock masses which are encountered frequently in western *** on generated mesh of fractured rock masses,combined with statistic damage constitutive model of intact rock and damage model of structural plane,progressive failure of fractured rock masses is studied using finite element method(FEM) .Furthermore,Scale effect and anisotropy of compressive strength of fractured rock masses are *** results show that the strength decreases and tend towards stability rapidly from intact rock to fractured rock masses,and the anisotropy of strength of fractured rock masses is not *** last,based on numerical simulation conducted on 10 m scale rock masses under different confining pressures,the equivalent strength parameters of fractured rock masses are gained and the results are compared with Hoek-Brown *** method developed is helpful for determination of strength parameters of fractured rock masses.

关键词： rock mechanics fractured rock masses equivalent strength parameters finite element method scale effect anisotropy

The Observation of Photorefractive Effect of Prism Coupling in Ion-implanted Fe-doped LiNbO3 Plannar Waveguide

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Chinese Journal of Lasers 1997年第5期B6卷 447-451页

作者： LU Fei MENG Mingqi WANG Keming (Department of Optics.shandong University,jinan 250100, china Department of Physics,shandong University jinan, 250100, china)WANG Jiyang (Institute of Crystal Materials,Shangdong University jinan 250100, china) shandong Univ Jinan China

A planar waveguide was formed in Fe-doped LiNbO3 crystal by MeV He ion implantation. The refractjve index profiles of the waveguide before and after annealing are compared. The experiments carried out on two wave mixi... 详细信息

关键词： ion implantation waveguide prism coupling photorefractive

The modified method of upwind with finite difference fractional steps procedure for the numerical simulation and analysis of seawater intrusion

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Progress in Natural Science:Materials International 2006年第11期16卷 1127-1140页

作者： * YUAN Yirang**, LIANG Dong and RUI Hongxing(Institute of Mathematics, shandong University,jinan 250100, china) Institute of Mathematics Shandong University Jinan 250100 China

Numerical simulation and analysis of seawater intrusion is the mathematical basis for modern environmental science. Its mathematical model is the nonlinear coupled system of partial differential equations with initial-boundary problems. For a generic case of a three-dimensional bounded region, the modified method of upwind with finite difference fractional steps procedure is put forward. Optimal order estimates in L~~2 norm are derived for the error in the approximation solution. The present method has been successfully used in predicting the consequences of seawater intrusion and protection projects.

关键词： seawater intrusion three-dimensional region upwind fractional steps L~~2 norm estimate.

The influence of laser pulse on the photoabsorption spectra of Li atom in strong external field

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Science china(Physics,Mechanics & Astronomy) 2006年第2期49卷 178-186页

作者： WANG Dehua1 & LIN Shenglu2 1. School of Physics and Electronic Engineering, Yantai Normal University, Yantai 264025, china 2. Department of Physics, shandong Normal University, jinan 2.0014, china 1. School of Physics and Electronic Engineering Yantai Normal University Yantai 264025 China 2. Department of Physics Shandong Normal University Jinan 250014 China

Using the time-dependent perturbation theory and the calculation formula of the single- and double-pulse absorption spectra of the atom in strong external fields, we calculate the single- and double-pulse absorption spectra of Li atom in strong magnetic field for different pulse widths. The results show that a pulse of some width can reduce the contribution of the short period closed orbits and eliminate the contribution of the long period orbits. Compared with the single-pulse absorption spectra, we found that for some phase differences, the double-pulse laser absorption spectra are strengthened; while for others, they are reduced. Therefore, we can use the pulse laser to control the oscillation of the absorption spectra and obtain the optimization object.

关键词： laser pulse closed orbit absorption spectra.

Research on Fuzzy Synthetic Evaluation of Stamping Process Scheme

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武汉理工大学学报 2006年第S2期28卷 479-483页

作者： JI Tingwei~1 GAO Jun~(1.2) ZHAO Guoqun~1 1.School of Mater.Sci.and Eng.,shandong Univ.,jinan 250061,china 2.shandong University at Weihai,Weihai 264209,china School of Mater.Sci.and Eng. Shandong Univ.Jinan 250061China School of Mater.Sci.and Eng. Shandong Univ.Jinan 250061China shandong University at Weihai Weihai 264209China

Stamping process,which is widely used in automobile,aerospace,machine-building industries,and etc.,is a creative process needing time and *** lead time is mainly spent on stamping die design and *** the ba- sis of die design,process design is a non-linearity and creative process,which can be solved by using the fuzzy synthetic evaluation. In this paper,the potential o f fuzzy synthetic evaluation for dealing with stamping process design was *** influencing factor set,factor weight set,evaluation set,single factor fuzzy evaluation matrix,and fuzzy synthetic evaluation scheme were ***,the washer part,considering forming equipment,part dimensions and other factors,was selected to testify the evaluation process.

关键词： stamping process scheme fuzzy synthetic evaluation

A general central limit theorem under sublinear expectations

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Science china Mathematics 2010年第8期53卷 1989-1994页

作者： LI Min & SHI YuFeng School of Mathematics,shandong University,jinan 250100,china 1. School of Mathematics Shandong University Jinan 250100 China

Under some weaker conditions,we give a central limit theorem under sublinear expectations,which extends Peng's central limit theorem.

关键词： central limit theorem sublinear expectation G-normal distribution