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Research on heart sound identification technology

science china(Information sciences) 2012年第2期55卷 281-292页

作者： CHENG XieFeng1,3,MA Yong2,LIU Chen1,ZHANG XueJun1 & GUO YuFeng11school of Electronic science and Engineering,nanjing university of Posts and Telecommunications,nanjing 210003,china 2school of computer science and technology,nanjing university of science and technology,nanjing 210094,china 3Key Lab of Broudbard Wireless Communication and Sensor Network technology(nanjing university of Posts and Telecommunications),Ministry of Education,nanjing 210094,china school of Electronic science and Engineering Nanjing University of Posts and Telecommunications Nanjing China Ministry of Education Key Lab of Broudbard Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Nanjing China school of computer science and technology Nanjing University of Science and Technology Nanjing China

In this article,both the basic principles and the experimental methods of identity recognition technology based on heart sounds are ***,the characteristics of heart sounds and the feasibility of heart sounds as a biometric were analyzed.A synthetic model of heart sounds was then developed based on a family of wavelets;Finally,the characteristic parameters of heart sounds were extracted by using the heart sounds linear band frequency cepstra(HS-LBFC)with a specified configuration,and the similarity distance was adopted for heart sound *** highlight the difference in two heart sound signals between the time and frequency domains,a construction method of the heart sound wavelet,a calculation method of the parameters of a synthetic model,selection of the characteristic parameters of heart sounds and the corresponding data processing technology were *** experimental results showed that the proposed method exhibited excellent performance and practicability.

关键词： biometric wavelet family of heart sounds synthetic model of heart sounds heart sounds linear band frequency cepstra(HS-LBFC)

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调控动态生长过程以构筑嵌段可换和光谱可调的有机异质结构（英文）

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science china Materials 2024年

作者：赵帅许超飞余悦夏星宇王磊王雪东廖良生 1.Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow university 2.Macao Institute of Materials science and Engineering, Macau university of science and technology Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Macao Institute of Materials science and Engineering Macau University of Science and Technology

与单一结构相比,有机嵌段异质结构具有特殊的光电性能.然而,有机分子间的相互作用主导了异质结构构建单元的生长顺序,如有机单元A、B会自发形成BAB型结构而不是相反的ABA型结构,不能可控生长.在此,我们提出了次序结晶工程,结合晶种逐步...

与单一结构相比,有机嵌段异质结构具有特殊的光电性能.然而,有机分子间的相互作用主导了异质结构构建单元的生长顺序,如有机单元A、B会自发形成BAB型结构而不是相反的ABA型结构,不能可控生长.在此,我们提出了次序结晶工程,结合晶种逐步自组装,控制共晶R与共晶N在彼此的两端纵向外延生长,从而精确合成具有可逆嵌段构型的有机嵌段异质结构:RNR和NRN. RNR有机嵌段异质结构,由于其逐渐掺杂的异质结而表现出渐变色的发射和波导特性,而NRN有机嵌段异质结构由于其明显的构筑异质结界限而表现出纯双色发射和波导特性.本工作实现了有机嵌段异质结构中嵌段块的有序可控生长,为未来光子学发展提供了制备合理复杂有机嵌段异质结构的途径.

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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 school of science Nanjing University of Science and Technology Nanjing China College of Civil Engineering Nanjing University of Technology Nanjing 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

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TRANSMISSION MOMENTARY EFFICIENCY BASED ON THE D'ALEMBERT-LAGRANGE EQUATION FOR INVOLUTES GEARS

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Chinese Journal of Mechanical Engineering 2004年第2期17卷 272-275页

作者： Liang Yi Lai Changying school of Mechanical Engineering,nanjing university of science and technology,nanjing 210094, china school of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094

The D'Alembert-Lagrange equation is introduced and used to derive theformulas of momentary efficiency for external gearing of standard involutes spur gears. The gearingswith correct and increased center distance are discussed. The momentary efficiency formula iscalculated and analyzed using software Matlab. The derived formula of momentary efficiency is alsocompared with the traditional formula.

关键词： D'Alembert-Lagrange equation Involutes gear Momentary efficiency

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Basin filling algorithm for the circular packing problem with equilibrium behavioral constraints

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science china(Information sciences) 2010年第5期53卷 885-895页

作者： LIU JingFa1& LI Gang2 1school of computer and Software, nanjing university of Information science & technology, nanjing 210044, china 2school of Mathematics and Physics, nanjing university of Information science & technology, nanjing 210044, china school of computer and Software Nanjing University of Information Science & Technology Nanjing China school of Mathematics and Physics Nanjing University of Information Science & Technology Nanjing China

With the background of the satellite module layout design, the circular packing problem with equilibrium behavioral constraints is a layout optimization problem and NP-hard problem in math. For lack of a powerful optimization method, this problem is hard to solve. The energy landscape paving (ELP) method is a class of stochastic global optimization algorithms based on the Monte Carlo sampling. Based on the quasiphysical strategy and the penalty function method, the problem is converted into an unconstrained optimization problem. Here by combining the improved ELP method, the gradient method based on local search and the heuristic configuration update mechanism, a new global search algorithm, basin filling algorithm, is put forward. The numerical results show that the proposed algorithm is effective to solving the circular packing problem with equilibrium behavioral constraints, and is easy to be popularized to other layout optimization problems.

关键词： equilibrium behavioral constraints packing problem layout optimization

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Anisotropic thermal conductivity of magnetic fluids

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Progress in Natural science:Materials International 2009年第2期19卷 205-211页

作者： Xiaopeng Fang,Yimin Xuan,Qiang Li school of Power Engineering,nanjing university of science & technology,nanjing 210094,china school of Power Engineering Nanjing University of Science & Technology Nanjing 210094 China

Considering the forces acting on the particles and the motion of the particles,this study uses a numerical simulation to investigate the three-dimensional microstructure of the magnetic fluids in the presence of an external magnetic field. A method is proposed for predicting the anisotropic thermal conductivity of magnetic fluids. By introducing an anisotropic structure parameter which characterizes the non-uniform distribution of particles suspended in the magnetic fluids,the traditional Maxwell formula is modified and extended to calculate anisotropic thermal conductivity of the magnetic fluids. The results show that in the presence of an external magnetic field the magnetic nanoparticles form chainlike clusters along the direction of the external magnetic field,which leads to the fact that the thermal conduc-tivity of the magnetic fluid along the chain direction is bigger than that along other directions. The thermal conductivity of the magnetic fluids presents an anisotropic feature. With the increase of the magnetic field strength the chainlike clusters in the magnetic fluid appear to be more obvious,so that the anisotropic feature of heat conduction in the fluids becomes more evident.

关键词： Magnetic fluids Anisotropic thermal conductivity Maxwell formula

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Investigation on performance of a solar thermophotovoltaic system

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science china(Technological sciences) 2008年第12期51卷 2285-2294页

作者： CHEN Xue, XUAN YiMin & HAN YuGe school of Power Engineering, nanjing university of science & technology, nanjing 210094, china school of Power Engineering Nanjing University of Science & Technology Nanjing China

In the light of the thermo-electric conversion principle, a model for predicting the performance of a solar thermophotovoltaic system is presented. The temperature distributions of the emitter for different concentrator ratios are numerically computed and the influence of the concentrator ratio on the system performance is analyzed. Numerical results show that the emitter temperature and the system efficiency increase with increase of the concentrator ratio. The effects of some other factors such as the spectral filter, cell temperature, and the reflectivity of the top and bottom surfaces of the emitter on the conversion performance of the STPV system are discussed.

关键词： STPV emitter temperature system efficiency

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Three-dimensional investigation of velocity skin effect in U-shaped solid armature

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Progress in Natural science:Materials International 2008年第12期18卷 1565-1569页

作者： Xin Li~a Chunsheng Weng~b a school of Power Engineering,nanjing university of science and technology,nanjing 210094,china b National Key Laboratory of Transient Physics,nanjing university of science and technology,nanjing 210094,china school of Power Engineering Nanjing University of Science and Technology Nanjing 210094 China National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing 210094 China

A three-dimensional transient computational model is applied to investigate the velocity skin effect (VSE) in a U-shaped solid arma- *** this model,current and heat transport in the armature can be evaluated *** results show a local concentration of current and joule heating at the interface,and significant damage occurs at the edges of the *** is also observed that there is significant enhanced heating at sharp comers because of the armature *** three-dimensional model can efficiently capture the salient features of the physical phenomena at the rail-armature interface,and contribute to the development of the armature design.

关键词： Electromagnetic launch Railgun U-shaped armature Velocity skin effect Erosion

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Basic study on architectural planning of psychiatric hospital

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science china(Technological sciences) 2010年第7期53卷 1755-1767页

作者： ZHOU Ying1 & SUN YaoNan2 1 Southeast university, nanjing 210096, china 2 nanjing university of science & technology, nanjing 210094, china Southeast university Nanjing China nanjing university of science & technology Nanjing China

This paper considers the main problems of the current mental health facilities in china from the standpoint of architects on the background that mental disorder has become a serious threat to human health. In order to effectively learn from the developed countries, this paper reviews the brief history of the world's mental health and the main phases of the evolution of psychiatric hospitals, analyzes the actual situation of mental health facilities abroad based on a large amount of data, compares the roles of public and private psychiatric hospitals from the viewpoint of government supervision, and investigates the functions and positions of psychiatric hospitals and the psychiatry divisions of general hospitals in the medical system. At last, this paper discusses the necessity of the systemization of mental health facilities, the role of psychiatric hospitals in this facility system and the developing approaches of psychiatric hospitals in china.

关键词： medical facility for mental disorder facility system psychiatric hospital principles

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Synthesis and Lubrication of Phosphorylcholine Derivative

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Journal of Bionic Engineering 2010年第3期7卷 254-258页

作者： Zhenliang Qiao~1, Dangsheng Xiong~1, Lude Lu~2, Pengju Jiang~2 1. Department of Materials science and Engineering, nanjing university of science and technology, nanjing 210094, P.R. china 2. school of Chemical Engineering, nanjing university of science and technology, nanjing 210094, P. R. china Department of Materials science and Engineering Nanjing University of Science and Technology Nanjing P.R. China school of Chemical Engineering Nanjing University of Science and Technology Nanjing P. R. China

The monomer of phosphorylcholine derivative, O-(5-（2-methacryloxy）-3, 3-dimethyl-3-azapentyl)-O’-（ω-hydroxy-octyl）-phosphatequaternary ammonium salt, was designed and synthesized successfully. It was characterized by the spectra ofHNMR and Mass spectra （ESI+）, and every signal was assigned. Then the lubricating characteristics of the phosphorylcholinederivative were investigated on the tribological setup of ball-oh-flat. The Ultra-High Molecular Weight Polyethylene（UHMWPE） flat was rotated against a stainless steel ball with 6 mm diameter. The load was 2.3 N, which corresponded to amaximal Hertz contact pressure of 29 MPa. Water, phosphorylcholine derivative, and Acrylic Acid （AA） solution were used aslubricants, respectively. Compared with AA, the phosphorylcholine derivative shows significant lubrication. It can be stronglyhydrated under water due to the charged segment in chemical structure. The thick water layers within the chains serves asboundary lubricants, and this is thought to be the molecular origins of lubricating behavior.

关键词： artificial joint articular cartilage molecular lubrication mechanism phosphorylcholine synthesis UHMWPE

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