检索结果-南通市图书馆

Tribological Properties of SiC/Cu Composite at High Temperature

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2009年第6期24卷 888-891页

作者：范冰冰张锐 zhengzhou Institute of Aeronautical Industry Management School of Materials Science & Engineering Zhengzhou University

SiC/Cu composites were prepared by hot pressing. The high temperature tribological properties of the composites were investigated. XRD, SEM techniques were carried out to characterize the samples. It is found that the friction coefficient of SiC/Cu composites increases with the increasing SiC content. The SiC reinforcement particles are worn down other than removed by pulling out during the wear test. Oxidation of Cu debris leads to the smooth contacting surface. Ring crack is formed under the cyclic wear test. The crack propagates through the damaged matrix and along the brittle interface between SiC particles and Cu matrix.

关键词： SiC/Cu composite tribological properties high temperature wear ring crack

SYNTHESIS　AND　CHARACTERIZATION　OF　NEIV　PICKET　FENCE　CROWN－PORPHYRIN　AND　ITS　Zn（Ⅱ），Fe（Ⅲ）　COMIPLEXES

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第4期7卷 325-328页

作者： Yang de WU,Fa Cheng QIAN, Lian Fang SHENa(Department of Chemistry, zhengzhou University. zhengzhou 4.0052)b(zhengzhou Tobacco Research Institute of China National Tabacco Coorporation.zhengzhou 450000)c(Laboratory of Magnetic Resonance and Atomic and Mole

A new picket fence porphyrin appended with multiple benzo -15-crown -5 ueits was synthesized by the reaction of meso- α,α,α,α- tetra (2-aminophenyl)porphyrin and 4- chloroformylbenzo - 15- crow - 5. Its Fe(Ⅲ) and... 详细信息

关键词： Zn COMIPLEXES CROWN PORPHYRIN FENCE CHARACTERIZATION OF Fe AND ITS

Hybrid particle swarm cooperative optimization algorithm and its application to MBC in alumina production

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2008年第11期18卷 1423-1428页

作者： Shengli Song~(a,b) Li Kong~a Yong Gan~b Rijian Su~(a,b) a Department of Control Scienee and Engineering,Huazhong University oF Science and Technology,Wuhan 430074,China b College of Computer and Communication Engineering,zhengzhou University of Light Industry,zhengzhou 450002,China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China College of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China

An effective hybrid particle swarm cooperative optimization(HPSCO)algorithm combining simulated annealing method and sim- plex method is *** main idea is to divide particle swarm into several sub-groups and achieve optimization through coop- erativeness of different sub-groups among the *** proposed algorithm is tested by benchmark functions and applied to material balance computation(MBC)in alumina *** show that HPSCO,with both a better stability and a steady convergence,has faster convergence speed and higher global convergence ability than the single method and the improved particle swarm optimization *** importantly,results demonstrate that HPSCO is more feasible and efficient than other algorithms in MBC.

关键词： PSO Simulated annealing Simplex Cooperative optimization

Remarkable achievements,splendid future——Celebrating the 45^(th) anniversary of synthetic diamond of China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

金刚石与磨料磨具工程 2008年第S1期28卷 1-19页

作者： Li Zhihong,Zhao Bo,Yi Yunlei,Wang Qin,Hua Shujie,Zhang Hui (zhengzhou Research Institute for Abrasives and Grinding,zhengzhou 450013,China)

The development of China as the world’s manufacturing house is best exemplified in the industry of diamond *** is indispensable in the creation of industrial infrastructure,including the construction of roads and building of *** world’s diamond was provided mainly by countries outside China in last ***,a"great leap forward"has taken shape with rapid expansion in Chinese diamond-making capabilities from the enlargement of the equipment(cubic presses) and improvements in diamond yield and product quality in the end of last *** the turn of this century,China outpaced the rest world combined in the total diamond output,became the largest producer in the world *** 2007,China produced nearly 4.4 billion carats,80%of the world’s diamond total *** Chinese diamond well accepted in the world can be seen in the export statistics of China & import statistics of developed countries in this *** example,59%of USA imported diamonds were from China in 2007;in Japan, 40%. This report contains a survey of some main industrial sectors that use diamond ***,22 tables and figures are used to portray the many facets of superabrasives,including cubic boron *** report also discusses several challenges facing Chinese diamonds,such as the vast price difference between imported diamond grit produced outside China and domestic *** paper also presents an outlook of the future development of the Chinese superabrasives industry basing on the Chinese macroeconomics and the recent data of the end-users as well as their future development *** paper concludes by proposing that although remarkable achievements have been made in the past 45 years,given the fact that Chinese superabrasives industry still lags behind that from the advanced countries on a multitude of variables,further endeavor should be made to make China a super country in the superabrasives industry in the world.

关键词： Industrial diamond superabrasives cubic press cubic boron nitride diamond saws

REGULARITY OF SOLUTIONS TO AN ELLIPTIC VARIATIONAL INEQUALITY SYSTEM

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1997年第1期10卷 91-96页

作者： LIANG Xiting (Department of Mathematics, Zhongshan University, Guangzhou 510275, China)WANG Xiangdong (Department Of Basic Courses, zhengzhou institute of Light industry, zhengzhou 450002, China)

Even for elliptic variational inequality systems with degenerate ellipticity in the form of (1) the boundedness and regularity are unsolved for general obstacle problems. In this paper the CI’cr regularity of solutio... 详细信息

关键词： Elliptic variational inequality system diagonal form degenerate ellipticity obstacle problem bounded solution local C(1 α) regularity

Providing personalized converged services based on flexible network reconfiguration

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2011年第2期54卷 334-347页

作者： HU YuXiang, LAN JuLong & WU JiangXing National Digital Switching System Engineering and Technological Research Center, zhengzhou 450002, China 1. National Digital Switching System Engineering and Technological Research Center Zhengzhou 450002 China

Recent developments show a progressing convergence of networks, services, and applications, which results in the necessity for new approaches to provide a ubiquitous experience on converged networks for specialized high data-rate services. A fundamental diversifying attribute for the future physical network convergence paradigm is pressing. In this paper, we make researches on converged resource reconfiguration model of substrate physical network based on hardware virtualization and provide a service oriented network architecture as a network convergence primitive. Based on the idea of hardware virtualization which is performed by platform deformation and component processing with reconfiguration (here, they are realized as reconfigurable routers (RR)), the substrate converged network, which inter-connects various access networks by reconfigurable routers, could be mapped into multiplex service oriented logical networks, supports dynamic reconfiguration due to diversified quality of services under heterogeneous environment, and therefore provides more flexible and high- speed multiple services. In addition, to demonstrate the generality of our model, we provide a prototype of reconfigurable router. The design, implementation and task scheduling as well as both hardware and software reconfiguration process of reconfigurable router are discussed in detail. Our evaluation shows that reconfigurable router is transparent for upper service-providing networks and results in little performance impact on the service delivery when both hardware and software reconfiguration are used.

关键词： network convergence hardware virtualization resource reconfiguration reconfigurable router

A　SUPERLINEARLY　CONVERGENT　GENERALIZED　GRADIENT　PROJECTION　ALGORITHMFOR　LINEARLY　CONSTRAINED　PROBLEMS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1995年第4期8卷 299-310页

作者： HE Guoping GAO Ziyou(Institute of Applied Mathematics,Academia Sinica,Beijing 100080,China)ZHU Jianqing (zhengzhou Institute of Surveying and Mapping,zhengzhou 4.0052,China) 中科院应用数学所北京解放军郑州测绘学院河南郑州 450052

Ａ　ＳＵＰＥＲＬＩＮＥＡＲＬＹＣＯＮＶＥＲＧＥＮＴＧＥＮＥＲＡＬＩＺＥＤＧＲＡＤＩＥＮＴＰＲＯＪＥＣＴＩＯＮＡＬＧＯＲＩＴＨＭＦＯＲＬＩＮＥＡＲＬＹＣＯＮＳＴＲＡＩＮＥＤ　ＰＲＯＢＬＥＭＳＮｅｗａｄｄｒｅｓｓ：Ｓｈａ... 详细信息

Ａ　ＳＵＰＥＲＬＩＮＥＡＲＬＹＣＯＮＶＥＲＧＥＮＴＧＥＮＥＲＡＬＩＺＥＤＧＲＡＤＩＥＮＴＰＲＯＪＥＣＴＩＯＮＡＬＧＯＲＩＴＨＭＦＯＲＬＩＮＥＡＲＬＹＣＯＮＳＴＲＡＩＮＥＤ　ＰＲＯＢＬＥＭＳＮｅｗａｄｄｒｅｓｓ：ＳｈａｎｄｏｎｇＭｉｎｉｎｇｉｎｓｔｉｔｕｔｅ，Ｓｈａｎｄｏｎｇ，Ｔａｉａｎ２７１０１９．＊Ｎｅｗａｄｄｒｅｓｓ：ＮｏｒｔｈｅｒｎＪｉａｏｔｏｎｇＵｎｉｖｅｒｓｉｔｙｌＢｅ１Ｊｉｎｇ１０００４０．ａｐｉｖｏｔｉｎｇｏｐｅｒａｔｉｏｎｉｎｏｒｄｅｒｔｏｄｅｔｅｒｍｉｎｅａｎｅ－ａｃｔｉｖｅｓｅｔｏｆｃｏｎｓｔｒａｉｎｔｓ．Ｓｅｃｏｎｄｌｙ，ｏｎｅｍｕｓｔｃｏｍｐｕｔｅａｎｅｗｐｒｏｊｅｃｔｉｏｎｍａｔｒｉｘａｔｅａｃｈｓｔｅｐ．Ｔｈｅｓｅａｒｅａｌｌｔｉｍｅ－－ｃｏｎｓｕｍｉｎｇａｎｄｏｆｔｅｎｍａｋｅｔｈｅａｌｇｏｒｉｔｈｍｔｏｂｅｕｎｓｔａｂｌｅ．ＩｎｔｈｉｓｐａｐｅｒｓｂｙｕｓｉｎｇｔｈｅｃｏｎｃｅｐｔｏｆｇｅｎｅｒａｌｉｚｅｄｐｒｏｊｅｃｔｉｏｎｍａｔｒｉＸｗｈｉｃｈｗａｓｐｒｏｐｏｓｅｄｉｎ［８］，ｗｅｉｍｐｒｏｖｅＷｕ＇ｓａｌｇｏｒｉｔｈｍａｎｄｐｒｅｓｅｎｔａｎｅｗａｌｇｏｒｉｔｈｍ．Ｕｎ?

关键词： Generalized gradient projection method linearly constrained problem superlinear convergence pivoting operation.

ANISOTROPIC BIQUADRATIC ELEMENT WITH SUPERCLOSE RESULT

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2006年第4期19卷 566-576页

作者： Dongyang SHI Shipeng MAO Hui LIANG Department of Mathematics Zhengzhou University Zhengzhou 450052 China.

The main aim of this paper is to study the convergence of biquadratic finite element tor the second order problem on anisotropic meshes. By using some novel approaches and techniques, the optimal error estimates are obtuined. At the same time, the anisotropic superclose results are also achieved. Furthermore, the numerical results are given to demonstrate our theoretical analysis.

关键词： Anisotropic optimal error estimates superclose.

The optimal design for weak optical feedback semiconductor laser with frequency modulation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1992年第2期 17-22页

作者： Linlin LI (zhengzhou University zhengzhou 4.0052, PRC)

In this paper the frequency modulation characteristics the semiconductor laserwith weak optical feedback are presented,considering both the frequency deviation and thespurious intensity *** frequency modulation can be realized without spurious in-tensity modulation under proper feedback *** is an optimal feedback intensity tomaximize the frequency deviation.

关键词： frequency modulation spurious intensity modulation weak optical feedback