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Massive Si Phase and Its Growth Mechanism in Al-Si Casting Alloy

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Journal of Materials science & Technology 2004年第5期20卷 589-591页

作者： Hengcheng LIAO and Guoxiong SUNDepaxtment of Materials science and engineering, southeast university, nanjing 210018, china Dept. of Mat. Sci. and Eng. Southeast Univ. Nanjing 210018 China

Optical microscope and scanning electron microscope were used to observe the microstructure of the AI-11.6%Si and AI-11.6%Si-0.4%Mg alloys and the morphology of the massive silicon particles. It is found that the massive silicon phase, observed in the unfully modified alloys with 0.010%Sr, disappears completely in the alloys fully modified with 0.020%Sr. The serrations and reentrant edges shown in the massive silicon particles with the conventional casting indicate that the TPRE mechanism plays an important role in the growth of the massive silicon phase. The ripples and steps suggest that the "lateral microscopic growth" may be another operating mechanism.

关键词： Al-Si alloy Massive silicon Microstructure Growth mechanism

Interactive group decision making procedure based on uncertain multiplicative linguistic preference relations

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Journal of Systems engineering and Electronics 2010年第3期21卷 408-415页

作者： Zeshui Xu1,2,1.College of Economics and Management,southeast university,nanjing 210096,P.R.china 2.Institute of sciences,university of science and Technology of the PLA,nanjing 210007,P.R.china College of Economics and Management Southeast UniversityNanjing 210096P.R.China Institute of sciences University of Science and Technology of the PLANanjing 210007P.R.China

Group decision making problems are investigated with uncertain multiplicative linguistic preference *** unbalanced multiplicative linguistic label set is introduced,which can be used by the experts to express their linguistic preference information over *** uncertain linguistic weighted geometric mean operator is utilized to aggregate all the individual uncertain multiplicative linguistic preference relations into a collective one,and then a simple approach is developed to determine the experts＇ weights by utilizing the consensus degrees among the individual uncertain multiplicative linguistic preference relations and the collective uncertain multiplicative linguistic preference ***,a practical interactive procedure for group decision making is proposed based on uncertain multiplicative linguistic preference relations,in which a possibility degree formula and a complementary matrix are used to rank the given ***,the proposed procedure is applied to solve the group decision making problem of a manufacturing company searching the best global supplier for one of its most critical parts used in assembling process.

关键词： group decision making uncertain multiplicative linguistic preference relations unbalanced multiplicative linguistic label set consensus degree interaction.

On the reconstruction of Dirichlet-to-Neumann map in inverse scattering problems with stability estimates

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science china Mathematics 2010年第8期53卷 2069-2084页

作者： WANG HaiBing 1,2 & LIU JiJun 1 1 Department of Mathematics,southeast university,nanjing 210096,china 2 school of Mathematics and Computational science,Hunan university of science and Technology,Xiangtan 411201,china 1. Department of Mathematics Southeast University Nanjing 210096 China2. School of Mathematics and Computational Science Hunan University of Science and Technology Xiangtan 411201 China

Consider the determination of Dirichlet-to-Neumann(D-to-N) map from the far-field pattern in inverse scattering problems,which is the key step in some recently developed inversion schemes such as probe ***,this problem is related to the reconstruction of the scattered wave from its far-field *** firstly prove the well-known uniqueness result of the D-to-N map from the far-field pattern using a new scheme based on the mixed reciprocity *** advantage of this new proof scheme is that it provides an efficient algorithm for computing the D-to-N map,avoiding the numerical differentiation for the scattered *** combining with the classical potential theory,a simple and feasible regularizing reconstruction scheme for the D-to-N map is *** the stability estimate for the reconstruction with noisy input data is rigorously analyzed.

关键词： inverse scattering Dirichlet-to-Neumann map regularization mixed reciprocity principle stability

EFFECTS OF COMBINED ADDITIONS OF TUNGSTEN AND MOLYBDENUM ON THE CREEP PROPERLIES OFFe_3Al-BASED ALLOYS

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Acta Metallurgica Sinica(English Letters) 2000年第6期13卷 1136-1140页

作者： X.Q. Yu and Y.S. Sun (Department of Materials science and engineering, southeast university, nanjing 210096, china) Dep. of Materials and Eng. Southeast Univ. Nanjing 210096 China

Effects of combined additions of tungsten and molybdenum on the creep properties of Fe3AI-based alloys have been investigated. Results show that combined additions of tungsten and molybdenum increase significantly the creep rupture life of the Fe3Al base alloys at high temperature. TEM analysis of the alloys containing tungsten plus molybdenum indicates that both solid-solution strengthening and precipitation harden- ing make the significant increase of creep rupture life.

关键词： Fe3Al creep property tungsten molybde8

EFFECT OF ELONGATED GRAIN STRUCTURE ON THEMECHANICAL PROPERTIES OF AN Fe_3Al-BASEDALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 358-362页

作者： X.Q. Yu and Y.S. Sun (Department of Materials science and engineering, southeast university, nanjing 210096, china) southeast Univ Nanjing China

The effect of hot-rolling processing on microstructure as well as the relationship between the elongated grain structure and tensile properties are investigated. The results indicate that the elongated grain structure influences the tensile properties and creep rupture life of Fe3Al alloy significantly. For the better strength and ductility at RT,a thinner elongated grain structure is desirable. When the elongated grain size is increased, the tensile properties will be decreased. On the other hand, the creeP rupture life at 600℃ is increased with the increase of elongated grain size.

关键词： Fe_3Al-based alloy microstructure tensile property

Three-dimensional subwavelength components utilizing THz surface plasmons

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science china(Information sciences) 2012年第1期55卷 79-89页

作者： ZHOU YongJin,JIANG Quan&CUI TieJun State Key Laboratory of Millimeter Waves,school of Information science and engineering,southeast university,nanjing 210096,china 1. State Key Laboratory of Millimeter Waves School of Information Science and Engineering Southeast University Nanjing 210096 China

Since surface plasmons(SPs)are not constrained by the diraction limit,they have important potential applications in the optical,terahertz(THz),and microwave *** this paper,we firstly present a review of three-dimensional(3D) bidirectional and multi-directional THz SP splitters based on the rectangular metallic groove gratings with finite thickness,in which a metallic wire was used to excite the THz *** experimental verifications of such splitters have been implemented in the microwave frequencies,and the measurement results have excellent agreements to the full-wave *** improve the performance,a 3D bidirectional THz SP splitter with the transverse confinement and a 3D bidirectional bending THz SP splitter are then proposed,which have shown very good splitting performance,compact sizes,and better transverse confinement of EM ***,a broadband slow-wave system of subwavelength thickness is reviewed and a new bending slow-wave system utilizing THz SPs is *** and simulations in microwave frequencies have good agreements,showing the validity of these components.

关键词： surface plasmons surface waves terahertz slow wave splitter

Three-dimensional elasticity solution of simple-supported rectangular plate on point supports, line supports and elastic foundation

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science china(Technological sciences) 2009年第3期52卷 584-589页

作者： XU YePeng1 & ZHOU Ding2 1 school of science, nanjing university of science and Technology, nanjing 210094, china 2 College of Civil engineering, nanjing university of Technology, nanjing 210009, china 1. school of science Nanjing University of Science and Technology Nanjing 210094 China 2. College of Civil engineering Nanjing University of Technology Nanjing 210009 China

This paper studies the bending of simple-supported rectangular plate on point supports, line supports and elastic foundation. On the basis of three-dimensional elasticity theory, the exact expressions of the displacement functions, which satisfy the governing differential equations and the simply supported boundary conditions at four edges of the plate, are analytically derived. The reaction forces of the in- termediate supports are regarded as the unknown external forces acting on the lower surface of the plate. The unknown coefficients are then determined by the boundary conditions on the upper and lower surfaces of the plate. Comparing the numerical results obtained from the proposed method to those obtained from Kirchhoff plate theory, Mindlin plate theory and those obtained from the commer- cial finite element software ANSYS, the high accuracy of the present method has been demonstrated.

关键词： rectangular plate point support line support elastic foundation displacement stress three-dimensional elasticity solution

Constructing Three-Dimension Space Graph for Outlier Detection Algorithms in Data Mining

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Wuhan university Journal of Natural sciences 2004年第5期9卷 585-589页

作者： ZHANG Jing 1,2 , SUN Zhi-hui 1 1.Department of computer science and engineering, southeast university, nanjing 210096, Jiangsu, china 2.Department of Electricity and Information engineering, Jiangsu university, Zhenjiang 212001, Jiangsu, china Department of computer science and engineering Southeast University. Nanjing 210096 Jiangsu China

Outlier detection has very important applied value in data mining literature. Different outlier detection algorithms based on distinct theories have different definitions and mining processes. The three-dimensional space graph for constructing applied algorithms and an improved GridOf algorithm were proposed in terms of analyzing the existing outlier detection algorithms from criterion and theory. Key words outlier - detection - three-dimensional space graph - data mining CLC number TP 311. 13 - TP 391 Foundation item: Supported by the National Natural science Foundation of china (70371015)Biography: ZHANG Jing (1975-), female, Ph. D, lecturer, research direction: data mining and knowledge discovery.

关键词： outlier detection three-dimensional space graph data mining

The renascence of industrial historic buildings——Taking the protective remolding and reusing of Chenguang Mechanical Factory in nanjing as an example

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science china(Technological sciences) 2009年第9期52卷 2502-2509页

作者： WANG YanHui Research Institute of Architecture,southeast university,nanjing 210096,china 1. Research Institute of Architecture Southeast University Nanjing 210096 China

The protective remolding and reusing of industrial historic buildings and sites is regarded as a great scientific matter in today's urban development. Based on discussing its significance and value,this paper,taking a specific example,makes a systematic discussion on the design strategy and method from the aspects of overall planning,remolding the old buildings,designing the new buildings,etc.

关键词： industrial historic buildings and sites protective remolding and reusing renascence strategy