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Damage mechanisms during lapping and mechanical polishing CdZnTe wafers

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Rare Metals 2010年第3期29卷 276-279页

作者： LI Yan,KANG Renke,GAO Hang,and WU Dongjiang Key Laboratory for Precision and Non-Traditional Machining technology (Ministry of Education),dalian university of technology,dalian 116024,China Key Laboratory for Precision and Non-Traditional Machining technology (Ministry of Education) Dalian University of Technology Dalian China

CdZnTe wafers were machined by lapping and mechanical polishing processes,and their surface and subsurface damages were *** surface damages are mainly induced by three-body abrasive wear and embedded abrasive wear during lapping process.A new damage type,which is induced by the indentation of embedded abrasives,is found in the *** a floss pad is used to replace the lapping plate during machining,the surface damage is mainly induced by two-body abrasive and three-body abrasive wear,and the effect of embedded abrasives on the surface is greatly ***,this new damage type nearly disappears on the subsurface.

关键词： lapping mechanical polishing wafers surface subsurface abrasive

NUMERICAL PREDICTION OF FATIGUE DAMAGE IN STEEL CATENARY RISER DUE TO VORTEX-INDUCED VIBRATION

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Journal of Hydrodynamics 2011年第2期23卷 154-163页

作者： GAO Yun ZONG Zhi SUN Lei State Key Laboratory of Structural Analysis for Industrial Equipment and Department of Naval Architecture and Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Dalian 116024 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China Faculty of Vehicle Engineering and Mechanics Dalian University of Technology Dalian 116024 China

For studying the characteristics of Steel Catenary Riser （SCR）, a simplified pinned-pinned cable model of vibration is established. The natural frequencies, the normalized mode shapes and mode curvatures of the SCR are calculated. The fatigue damage of the SCR can be obtained by applying the modal superposition method combined with the parameters of S -N curve. For analyzing the relation between the current velocity and the SCR＇s fatigue damage induced by the vortex-induced vibration, ten different current states are evaluated. Then, some useful conclusions are drawn, especially an important phenomenon is revealed that the maximum fatigue damage in the riser usually occurs near the area of the boundary ends.

关键词： vortex-induced vibration Steel Catenary Riser (SCR) fatigue damage modal superposition method

The cut sets,decomposition theorems and representation theorems on intuitionistic fuzzy sets and interval valued fuzzy sets

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Science China(Information Sciences) 2011年第1期54卷 91-110页

作者： YUAN XueHai,LI HongXing & SUN KaiBiao School of Electronic and Information Engineering,dalian university of technology,dalian 116024,China School of Electronic and Information Engineering Dalian University of Technology

In this paper,the cut sets,decomposition theorems and representation theorems of intuitionistic fuzzy sets and interval valued fuzzy sets are researched ***,new definitions of four kinds of cut sets on intuitionistic fuzzy sets are introduced,which are generalizations of cut sets on Zadeh fuzzy sets and have the same properties as that of Zadeh fuzzy ***,based on these new cut sets,the decomposition theorems and representation theorems on intuitionistic fuzzy sets are *** kind of cut sets corresponds to two kinds of decomposition theorems and representation *** eight kinds of decomposition theorems and representation theorems on intuitionistic fuzzy sets are obtained,*** last,new definitions of cut sets on interval valued fuzzy sets are given based on the theory of cut sets on intuitionistic fuzzy sets,and eight kinds of decomposition theorems and representation theorems on interval valued fuzzy sets are also obtained. These results provide a fundamental theory for the research of intuitionistic fuzzy sets and interval valued fuzzy sets.

关键词： intuitionistic fuzzy sets interval valued fuzzy sets triple valued fuzzy sets cut sets decomposition theorem representation theorem

A TRIANGULAR QUASI-CONFORMING FINITE ELEMENT FOR TRANSIENT DYNAMIC ANALYSIS

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Acta Mechanica Sinica 1990年第1期6卷 59-63页

作者： Liu Yingxi Tang Limin, dalian university of technology dalian university of technology Dalian China

A type of 3 node triangular element is constructed by the Quasi-conforming method, which may be used to solve the equation of a type of inverse problem of wave propagation after Laplace transformation △u-A^2u=0. The strains in the element are approximated by an expohential function and the string-net function between neigh- bouring elements is apporoximated by one dimensional general solution of the equation. Furthermore the strain field satisfies the equation, and therefore in the derivation of the element formulation, no shape function is needed. In this sense, it is a kind of hybrid element. Compared with the ordinary linear triangular element, the new one features higher precision with coarse meshes. Some numerical tests are presented.

关键词： quasi-conforming finite element method wave propagation equation

THE SIMULTANEOUS APPROXIMATION IN THE LOCALLY CONVEX SPACES

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Analysis in Theory and Applications 1995年第1期11卷 72-79页

作者： Song Wenhua(dalian university of technology, China) Institute of Mathematical Sciences Dalian University of Technology Dalian P.R. China

In this paper, we study the characterization of f-Chebyshev radius and f-Chebyshev centers and the existence of f-Chebyshev centers in locally convex spaces.

关键词： THE SIMULTANEOUS APPROXIMATION IN THE LOCALLY CONVEX SPACES

THE COAPPROXIMATION IN LINEAR SPACES

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Analysis in Theory and Applications 1993年第4期9卷 55-65页

作者： Son Wenhua dalian university of technology,China Institute of Mathematics Sciences Dalian University of Technology Dalian PRC

In this paper,we investigate the properties of strongly coapproximation in normed linear spaces and lo- cally,convex *** relations between strongly coapproximation and strongly unique approximation and of the f-coappr... 详细信息

关键词： Th THE COAPPROXIMATION IN LINEAR SPACES

THE APPROXIMATION ON LOCALLY CONVEX SPACES

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Analysis in Theory and Applications 1994年第1期10卷 26-33页

作者： Song Wenhua dalian university of technology, China Institute of Mathematical Science Dalian University of Technology Dalian P. R. China

In this paper, we give some properties of f-approximation, f-Chebyshev centers and f-farthest points in locally convex spaces.

关键词： Bilinear Form Closed Subspace Convex Space Simultaneous Approximation Normed Linear Space

Long-Term Joint Distribution of One-Tenth Large (or Significant) Wave Height with Average Period

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China Ocean Engineering 1992年第4期7卷 383-394页

作者： Pan Jinchang Associate Professor, dalian university of technology, 116024 dalian

In this paper, by using the wave data from a few oceanographic observation stations in the coastal zone of the Yellow Sea, the East China Sea and the South China Sea, the long-term joint distribution of the one-tenth large (or significant) wave height with average period is studied. The statistical data demonstrate that the long- term distribution of the one- tenth wave height or average period fits the log-normal distribution, thus the joint distribution also fits the two-dimensional log-normal distribution. Then the conditional probability distribution of the average period is derived, and the range as well as the mode of the average wave period corresponding to a certain return period of wave height can be calculated easily.

关键词： joint distribution wave height average period probability

Synthesis of Alkyl4(4'-octyloxy-4”-biphenylcarboxy)-benzenesulfonates

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Chinese Chemical Letters 1998年第8期9卷 711-713页

作者： Zhi Ping LI Guo Du REN(State Key Laboratory of Fine Chemicals, dalian university of technology dalian 116012) State Key Lab. of Fine Chemicals Dalian University of Technology Dalian 116012 China

Five new Liquid Crystals with sulfonate units were synthesized. And they were detendned by FT-IR and MS. The points of phase transition and the temperatUre ranges of liquid crystals were measured by means of DSC and P... 详细信息

关键词： liquid Crystal sulfonate synthesis