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武汉大学学报（自然科学版） 1998年第5期44卷 554-556页

作者：刘国栋广东惠州大学数学系惠州516015

给出简捷计算n元Euler-Bernoulli多项式的公式，建立一些包含递归序列和上述多项式的恒等式．

关键词： n元计算公式递归序列恒等式 E-B多项式

EXAMINATION OF CARBON DIFFUSION IN NIOBIUM CLAD STEEL COMPOSITE

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Journal of Central South university 1999年第1期11卷 2-4页

作者： Xia Changqing Jin Zhanpeng (department of Materials Science and Engineering, Central South university of Technology, Changsha 410083,{2.) department of Materials Science and Engineering Central South University of Technology Changsha 410083 China

Ｔｈｅｎｉｏｂｉｕｍｃｌａｄｓｔｅｅｌｃｏｍｐｏｓｉｔｅｉｓａｃｌａｄｓｔｅｅｌｐｌａｔｅ，ｉｎｗｈｉｃｈｔｈｅｂａｓｅｍｅｔａｌｉｓｓｔｅｅｌｗｉｔｈ０．２０％ｃａｒｂｏｎａｎｄｔｈｅｃｌａｄｄｉｎｇｍｅｔａｌｉ... 详细信息

Ｔｈｅｎｉｏｂｉｕｍｃｌａｄｓｔｅｅｌｃｏｍｐｏｓｉｔｅｉｓａｃｌａｄｓｔｅｅｌｐｌａｔｅ，ｉｎｗｈｉｃｈｔｈｅｂａｓｅｍｅｔａｌｉｓｓｔｅｅｌｗｉｔｈ０．２０％ｃａｒｂｏｎａｎｄｔｈｅｃｌａｄｄｉｎｇｍｅｔａｌｉｓｎｉｏｂｉｕｍｗｉｔｈｅｘｃｅｌ...

关键词： Nb 2. phase carbon activity stationary diffusion

Integral Input-to-state Stability for One Class of Discontinuous Dynamical Systems

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Integral Input-to-state Stability for One Class of Discontin...

THE DAMAGE STATES AND TENSILE FAILURE BEHAVIOR OF TORSIONAL PRESTRAINED STEELS

第二十九届中国控制会议

作者： MU Xiaowu1,GAO Yang1,2.ZHAO Wei2.1.department of mathematics,ZhengZhou {2.,Zhengzhou 450052.P.R.china2.department of mathematics,Daqing Normal {2.,Daqing 163712.P.R.china

It is well known that integral input-to-state stability（iISS）is weaker than input-to-state stability（ISS）.In this pa-per,iISS problems for one class of discontinuous dynamical systems are *** smooth iISS-Lyapunov functions are ***,interconnections of discontinuous dynamical systems are *** results for a class of discontinuous dynamical systems and interconnection of discontinuous dynamical systems’iISS character are shown,respectively.

关键词： Input-to-state Stability Integral Input-to-state Stability Stability Filippov Solution

来源： cnki会议评论

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Acta Mechanica Solida Sinica 1994年第3期7卷 229-234页

作者： zhou li(department of Applied Mechanics,Northwestern Polytechnical university,Xi’an,710072.P.R.{2.) department of Applied Mechanics Northwestern Polytechnical University Xian 710072 China

In this paper,the damage state of a torsional prestrained steel is examined by means of the concepts of continuum damage mechanics and then the tensile properties and fracture ductility of two kinds of steels under various torsional prestrained conditions are investigated from both macroscopic and microscopic points of very slight as contrasted with tensile damage;(2.after torsional prestraining,both yielding strength and ultimate tensile strength become higher for 2. steel and lower for 40Cr steel;(3)when the torsional prestrain exceeds a critical value,that is about 70% of pure torsional shear fracture strain,the ductile-brittle transition of tensile fracture behavior may ***,the advantages and applicable conditions of torsional prestrain strengthening technique are also discussed.

关键词： torsional prestrain plastic damage tensile failure ductile-brittle transition

Study on optimization of agent initial positions in land combat simulation

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Progress in Natural Science:Materials International 2004年第3期 65-69页

作者： WU Chunguo 1,2. , LIANG Yanchun* 1, 2. , LEE Heow Pueh 2. LU Chun 2.and YANG Xiaowei 3,4 (1. College of Computer Science and Technology, Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education, Jilin university, Changchun 130012. china 2. Institute of High Performance Computing, Singapore 11752., Singapore 3. {2. of Applied mathematics, South china university of Technology, Guangzhou 510640, china 4. Centre for ACES, {2. of Mechanical Engineering, National university of Singapore, 1192.0, Singapore) CollegeofComputerScienceandTechnology KeyLaboratoryofSymbolComputationandKnowledgeEngineeringoftheMinistryofEducationJilinUniversityChangchun130012China InstitiuteofHighPerformanceComputing Singapore117528Singapore departmentofAppliedmathematics SouthChinaUniversityofTechnologyGuangzhou510640China

The use of computational intelligence based techniques in the optimization of agent initial positions in land combat simulations is studied. A novel method for the reduction of support vectors in the support vector machine (SVM) is presented. The optimization on the width of the Gaussian kernel function and the combination of the SVM with the radial basis function neural network are performed in the proposed method. Simulation results show that the proposed method can improve the running efficiency drastically compared with that using the traditional SVM with the same precision. We also summarize and present some experiences and trends in the study on the optimization problem in land combat simulation.

关键词： multi agent support vector machine radial basis function genetic algorithm regression.

The Controllability of Cartesian Flexible Robot System

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Systems Science and Systems Engineering 1996年第2期6卷 240-245页

作者： WANG Zheng LIN Xianning HOU Xuezhang(department of mathematics, Northeast NOrmal {2., Changchun, 13002.)

The control system of X-Y Catesian flexible robot is considered in present *** have established the evolution equation model in an appropriate Hilbert space for the system of one-link flexible arm with payload, and us... 详细信息

关键词： flexible robot control system controllability

Two-dimensional models of threshold voltage and subthreshold current for symmetrical double-material double-gate strained Si MOSFETs

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Chinese Physics B 2016年第3期25卷 440-444页

作者：辛艳辉袁胜刘明堂刘红侠袁合才 department of Information and Engineering North China University of Water Resources and Electric Power Key Laboratory for Wide Band Gap Semiconductor Materials and Devices of Education School of Microelectronics Xidian University department of mathematics and Information Science North China University of Water Resources and Electric Power

The two-dimensional models for symmetrical double-material double-gate （DM-DG） strained Si （s-Si） metal-oxide semiconductor field effect transistors （MOSFETs） are presented. The surface potential and the surface electric field ex- pressions have been obtained by solving Poisson＇s equation. The models of threshold voltage and subthreshold current are obtained based on the surface potential expression. The surface potential and the surface electric field are compared with those of single-material double-gate （SM-DG） MOSFETs. The effects of different device parameters on the threshold voltage and the subthreshold current are demonstrated. The analytical models give deep insight into the device parameters design. The analytical results obtained from the proposed models show good matching with the simulation results using DESSIS.

关键词： double-material double-gate MOSFET strained Si threshold voltage subthreshold current

A STREAMLINE-BASED PREDICTIVE MODEL FOR ENHANCED-OIL-RECOVERY POTENTIALITY

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Journal of Hydrodynamics 2008年第3期20卷 314-322页

作者： HOU Jian ZHANG Shun-kang DU Qing-jun LI Yu-bin College of Petroleum Engineering China University of Petroleum （East China） Dongying 257061 China Chemical and Petroleum department University of Calgary Calgary T2N 1N4 Canada

A pseudo-three-dimensional model of potentiality prediction is proposed for enhanced oil recovery, based on the streamline method described in this article. The potential distribution of the flow through a porous medium under a complicated boundary condition is solved with the boundary element method. Furthermore, the method for tracing streamlines between injection wells and producing wells is presented. Based on the results, a numerical solution can be obtained by solving the seepage problem of the stream-tube with consideration of different methods of Enhanced Oil Recovery（EOR）. The advantage of the method given in this article is that it can obtain dynamic calculation with different well patterns of any shape by easily considering different physicochemical phenomena having less calculation time and good stability. Based on the uniform theory basis-streamline method, different models, including CO2.miscible flooding, polymer flooding, alkaline/surfactant/polymer flooding and microbial flooding, are established in this article.

关键词： boundary element method streamline method Enhanced Oil Recovery(EOR) CO2.miscible flooding chemical flooding microbial flooding

THE CIRCULATION DECOMPOSITION OF THE PROBABILITY CURRENTS OF THE BILATERAL BIRTH AND DEATH PROCESSES

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Scientia Sinica 1981年第10期24卷 1340-1351页

作者：郭懋正吴承训 department of mathematics Peking University

In the present paper,we study the ergodie property of the nonterminating bilateral birthand death processes and obtain the invariant measures in all ergodic cases. The conceptions ofthe probability current matrix, the generalized circulation and the circulation decomposition areintroduced. It is proved that all the probability current matrices of the stationary bilateralbirth and death processes ean be decomposed into the sum of denumerable generalized circu-lation matrices. The circulation decomposition is an important characteristic of the generalirreversible processes in stationary states far from equilibrium as well as the stational.y bilat-eral birth and death processes.

关键词： lim

Quasi-Carbon Fibers and the Composites

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Journal of Materials Science & Technology 2000年第5期16卷 486-490页

作者： Lulu SONG, Weihong ZHONG+, Zuoguang ZHANG and Zhijie SUN (department of Materials Science & Engineering, Beijing university of Aeronautics and Astronautics, Beijing 100083,{2.) department of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

The aim of this report is to study the properties of quasi-carbon fibers (QCF) prepared from the PAN fiber precursor by pyrolysis at a temperature between 400℃ and 12.0℃. The resistivity of QCF with different heat-treated temperature (HTT) was investigated by a Hall-35 testing system, and the flexural properties of the result composites (QCFC) are also discussed. In addition, the scanning electronic microscope (SEM) was utilized to observe the surface morphology of QCF and the fracture section of QCFC obtained from flexural testing.

关键词： QCF Quasi-Carbon Fibers and the Composites HTT