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ANALYSIS OF SOUND RADIATION FROM THE RING-STIFFENED CYLINDRICAL SHELL COATED WITH VISCOELASTIC LAYER IN FLUID MEDIUM

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Acta Mechanica Solida Sinica 2003年第2期16卷 155-161页

作者： Luo Dongping Cai Minbo Peng Xu Luo Bin (Department of Naval and Ocean engineering,huazhong {2. of science and technology,wuhan 430074,china) Department of Naval engineering Huazhong Univ. of Sci./Technology Wuhan 430074 China

The Donnell theory of shell is applied to describe shell motion and layer motion is described by means of three-dimensional Navier *** deformation harmonious condi- tions of the interface,the effects of stiffeners and layer are treated as reverse forces and moments acting on the cylindrical *** studying the acoustic field produced by vibration of the sub- merged ring-stiffened cylindrical coated shell,the structure dynamic equation,Helmholtz equation in the fluid field and the continuous conditions of the fluid-structure interface compose the cou- pling vibration equation of the *** extract of sound pressure comes down to the extract of coupling vibration *** use of the solution of the equation,the influ- ences of hydrostatic pressure,physical characters and geometric parameters of the layer on sound radiation are discussed.

关键词： viscoelastic layer ring-stiffened cylindrical coated shell coupling vibration equation sound radiation

HCWCI/Carbon Steel Bimetal Liner by Liquid-Liquid Compound Lost Foam Casting

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Journal of Iron and Steel Research International 2012年第10期19卷 13-19页

作者： XIAO Xiao-feng1,2. YE Sheng-ping2. YIN Wei-xin3, XUE Qiong4 (1. School of Mechanical engineering and Automation, wuhan Textile {2., wuhan 430073, Hubei, china 2. State Key Laboratory of Material Processing and Die and Mould technology, huazhong university of science and technology, wuhan 430074, Hubei, china 3. wuhan Zhike Abrasive-Resistant Material science and technology Development Co Ltd, wuhan 430073, Hubei, china 4. College of science, wuhan {2. of technology, wuhan 430079, Hubei, china) School of Mechanical engineering and Automation Wuhan Textile University Wuhan Hubei China State Key Laboratory of Material Processing and Die and Mould technology Huazhong University of Science and Technology Wuhan Hubei China wuhan Zhike Abrasive-Resistant Material science and {2. Development Co Ltd Wuhan Hubei China College of science Wuhan University of Technology Wuhan Hubei China

Impact, friction and corrosion from the grinding balls and the grinding medium during the mineral processing result in liner breakage. Liner, made from Hadfield steel or alloyed steel, could not have served in wet grinding environment for more than ten months. Composite liner, made from HCWCI (high Cr white cast iron) and carbon steel, has been developed successfully with liquid-liquid composing process based on LFC (lost foam casting). The microstructure of composite was analyzed with optical microscope, SEM (scanning electron microscope)/EDX energy-dispersive X-ray and XRD (X-ray diffraction). According to micrograph, the combination region of two metals was staggered like dogtooth, no mixtures occurred between two liquid metals, and its interface presented excellent metallurgical bonding state. The results of mechanical property test show that, the hardness of HRC, the fracture toughness, and the bending strength are more than 61, 16.5 J/cm2.and 1 600 MPa, respectively. Comparison between liners made from bimetal composite and alloyed steel has also been investigated in industrial hematite ball mill. The results of eight months test in wet grinding environment prove that the service life of bimetal composite liner is three times as long as that of one made from alloyed steel.

关键词： composite liner bimetal liquid-liquid compound composite interface lost foam casting high Cr white cast iron

On Incentive Strategy with a kind of Incomplete Information

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Systems science and Systems engineering 1994年第2期4卷 119-124页

作者： JIN Wu CHEN Ting(institute of Systems engineering,{2.,wuhan, 430074, china)

The designing of incentive strategy when the follower’s objective functions have Parameters unknown to the leader is investigated in this paper. A desinging approach named IncentiveStrategy with Unknown but Bounded ... 详细信息

关键词： Sthekelberg game incentive strategy incomplete information unknown but bounded error.

Wafer level bonding using localized radio-frequency induction heating

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science china(Technological sciences) 2010年第5期53卷 1252-1257页

作者： CHEN MingXiang1,2.LIU WenMing1,2.XI YanYan1,2.LIN ChangYong1,2.& LIU Sheng1,2.1 School of Mechanical science & engineering,{2. university of science and technology,wuhan 430074,china 2.Division of MOEMS,wuhan National Laboratory for Optoelectronics,wuhan 430074,china School of Mechanical science & engineering Huazhong University of Science and Technology Wuhan China Division of MOEMS Wuhan National Laboratory for Optoelectronics Wuhan China

A wafer level bonding technique by localized induction heating has been developed and demonstrated in this paper.A suitable fabrication process scheme has also been established for the localized induction heating and *** takes only about 2. seconds to complete the bonding *** temperatures of solder loops and the central area of solder loops are above 300°C and below 70°C,*** to the solder reflow,robust and hermetic glass wafer bonding is accomplished,and the average tensile strength is 6.42.***-heated or over-heated bonding has been found to result in cracks at bonding interfaces and sputtering layer,which degrades the bonding qualities.

关键词： wafer bonding induction heating MEMS MEMS packaging

Multi-materials drop-on-demand inkjet technology based on pneumatic diaphragm actuator

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science china(Technological sciences) 2010年第6期53卷 1605-1611页

作者： XIE Dan1,2.ZHANG HongHai1,2.SHU XiaYun1,2.Xiao JunFeng1,2.& CAO Shu1,2.1institute of Micro-Systems,School of Mechanical science and {2.,huazhong university of science and technology,wuhan 430074,china 2.7} National Laboratory for Optoelectronics,wuhan 430074,china institute of Micro-Systems School of Mechanical Science and Engineering Huazhong University of Science and Technology wuhan National Laboratory for Optoelectronics

Micro-droplet jetting belongs to the field of precision fluid dispensing *** traditional subtraction manufacture process,micro-droplet jetting as an additive fabrication technique with features of non-contact and data-driven represents a new development trend of modern manufacturing *** this paper,the design,fabrication and performance of a multi-materials drop-on-demand (DOD) inkjet system based on pneumatic diaphragm actuator were *** capturing the droplet ejection process and measuring the droplet dimension,a self-made in situ imaging system based on time delayed external trigger was set *** performance of the generator was studied by adjusting the structure and control ***,the influence of fluid properties on the droplet ejection process was experimentally ***-solderballs of 160.5 μm in diameter and UV curing adhesive micro-bumps of 346.94 μm in contact diameter with the substrate were *** results demonstrated that the DOD inkjet generator possesses characteristics of robust,easy to operate and maintain,and able to withstand high temperature as well as applicability to a wide variety of materials including polymers,low melting point resin and high melting point *** system has a great potential of being used in the fields of IC and MEMS packaging,3D printing,organic semiconductor fabrication,and biological and chemical analysis.

关键词： micro-droplet jetting drop on demand pneumatic diaphragm actuator multi-materials

Experimental study on high viscosity fluid micro-droplet jetting system

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science china(Technological sciences) 2010年第1期53卷 182-187页

作者： SHU XiaYun1,2.ZHANG HongHai1,2.LIU HuaYong1,2.XIE Dan1,2.& XIAO JunFeng1,2.1 School of Mechanical science and engineering,{2. university of science and technology,wuhan 430074,china 2.Division of MOEMS,wuhan National Laboratory of Optoelectronics,wuhan 430074,china School of Mechanical science and engineering Huazhong University of Science and Technology Division of MOEMS Wuhan National Laboratory of Optoelectronics

Fluid dispensing is a method by which fluid materials(such as epoxy,adhesive,and encapsulant) are delivered in a controlled manner in electronics *** jetting,derived from inkjet technology,is a noncontact,data-driven fluid dispensing *** ideal fluid materials for packaging are usually high viscous,which is difficult to realize by traditional inkjet *** this paper,a mechanical micro-droplet jetting system for high viscosity fluid was *** consists of dispensing valve,motion stage,temperature control subsystem,pneumatic subsystem,driving circuit for solenoid valve,and system control *** of this system under various circumstances was studied by changing several parameters,including working temperature,stroke length,back pressure and drive pulse *** droplets of 0.35 mm in diameter were produced by stainless steel nozzle of 0.2.mm in diameter in the experimental study.

关键词： high viscosity fluid micro-jetting microelectronics packaging

Synthesis and characterization of six-arm star-shaped liquid crystalline cyclotriphosphazenes

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Chinese Chemical Letters 2010年第6期21卷 682-685页

作者： Rui Bao,Min Pan,Jin Jun Qiu,Cheng Mei Liu~* School of Chemistry and Chemical engineering,huazhong {2. of science and technology,wuhan 430074,china School of Chemistry and Chemical engineering Huazhong University of Science and Technology Wuhan 430074 China

The synthesis and mesomorphic properties of a new class of liquid crystalline cyclotriphosphazenes with rigid cyanostilbene groups and flexible alkoxy groups are *** thermal behaviors of cyclotriphosphazene derivatives 5a-5d are studied by the means of differential scanning calorimetry,polarizing optical *** phases were observed in compounds 5a-5d both on heating and *** clear temperatures of compounds 5a-5d slightly increased with increasing length of terminal alkyl *** 5a-5d showed different mesogenic region from minimum 5℃to maximum 142..

关键词： Cyclotriphosphazene Cyanostilbene Liquid crystal Star-shaped molecule Synthesis

Algorithm of graph isomorphism with threedimensional DNA graph structures

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Progress in Natural science:Materials International 2005年第2期15卷 86-89页

作者： LIU Guangwu 1,2., YIN Zhixiang 1,3, XU Jin1 and DONG Yafei1(1. Department of Control science and engineering, Hua Zhong {2. of science and technology, wuhan 430074, china 2. College of Transportation, wuhan {2. of technology, wuhan 430063, china 3. Department of Mathematics and Physics, Anhui {2. of science and technology, Huainan 2.2.01, china) Department of Control science and engineering Hua Zhong University of Science and Technology Wuhan 430074 China. College of Transportation Wuhan University of Technology Wuhan 430063 China. Department of Mathematics and Physics Anhui University of Science and Technology Huainan 232001 China

An algorithm for solving the graph isomorphism problem with 3-D DNA structures is proposed in this paper. The k-armed branched junction molecules are used to code k-degree vertices. Double stranded molecules are used to code edges. Then the molecules are mixed in a tube to be ligated. The result can be detected by gel electrophoresis. The time complexity of the algorithm is O(n2., where n is the number of vertices of the graph.

关键词： DNA computing DNA graph structure graph isomorphism

THE POWER FLOW AND TRAVELING WAVE APPROACH TO THE VIBRATION ANALYSIS OF BASE-ISOLATED MULTI-STOREY BUILDINGS

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Acta Mechanica Solida Sinica 1995年第3期8卷 228-235页

作者： Zhu Hongping Tang Jiaxiang (Department of Civil engineering,huazhong {2. of science & technology,wuhan 430074,P.R.china) huazhong UNIV SCI & TECHNOL DEPT CIVIL ENGNWUHAN 430074PEOPLES R CHINA

The receptance approach to periodic structure theory is applied to study the wave propagation and vibration power flow into a base-isolated multi-storey building due to horizontal harmonic ground ***-storey buildings and laminated rubber bearings have been modeled as periodic systems in this paper. Although the simplified model considered is quite simple,it is expected that it will bring forth the key differences between continuous and a single freedom *** results indicate that the isolation effectiveness depends on not only the number of storeys of the laminated rubber bearings but also the frequency characteristics of the superstructure.

关键词： wave propagation power flow laminated rubber bearings