检索结果-南通市图书馆

PREPARATION AND SURFACE CHARACTERIZATION OF TiO2 THIN FILMS ON GLASS BY MAGNETRON SPUTTERING METHOD

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第2期15卷 207-209页

作者： L.S.Yin1,3., H. Shen2) and J.X. Zhang3. 1)college of Information engineering, Central south {3., Changsha 410075, China 2)guangzhou Institute of Energy Conversion, CAS, guangzhou 510070, China 3.Department of Physics, Zhongshan {3., Guang college of Information engineering Central South University Changsha 410075 China

Ti thin films were firstly deposited on glass substrates by magnetron sputtering method, then sintered the Ti thin films in air atmosphere and finally TiO2 transparence thin films on glass substrates were obtained. The structure and surface morphologies of the thin films were characterized by X-ray diffraction and SEM. The growth process of the thin films has been observed. The annealing time and annealing temperatures have an affect on the growth of the films.

关键词： TiO2. thin film. magnetron sputtering

Algorithm of graph isomorphism with threedimensional DNA graph structures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

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 university of Science and technology, Wuhan 43.074, China 2. {3. of Transportation, Wuhan university of technology, Wuhan 43.063. China 3. Department of Mathematics and Physics, Anhui university of Science and technology, Huainan 23.001, 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

Preparation of Nanosized AlOOH and Its Application in Polymer-inorganic Nanocomposites

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan university of technology(Materials Science) 2008年第5期23卷 638-643页

作者：廖海达 State Key Lab of Advanced technology for Materials Synthesis and Processing Wuhan University of Technology college of Chemistry and Ecological engineering Guangxi University for Nationalities Key Lab of Nonferrous Materials and New Processing technology (Guangxi university Guilin University of Technology) Ministry of Education

With industrial grade Al（OH）3.as raw materials, the self dispersion nanosized AlOOH crystal powder were prepared by the sol-hydrothermal method. The results of XRD and TEM show that the nanosized AlOOH could automatically disperse to a single-dispersing state in water without surface modification, dispersant, additive and accessional conditions （ultrasonic wave dispersing, ball-mill dispersing）. The application results of the product indicate that the nanosized AlOOH can be composed into a toughened nanocomposites without surface modification. Accordingly, the self dispersion characteristic and mechanism of hydrothermal crystallization and charging composite dispersion of nanosized AIOOH are found, and a new technique of preparing polymer/inorganic nanocomposites is proposed, which is called blending compositing new techniques of sol even dispersing at auasi-homogeneous phase.

关键词： self dispersion nanosized AlOOH peptizing-hydrothermal method nanocomposites

Tensile and compression properties of Zr-based bulk amorphous alloy at different temperatures

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2005年第5期48卷 489-495页

作者： WANG Xu1,3. LOU Decheng1, GAO Zhanjun4, LIU Lei1, LIANG Hongmei1, WANG Qingfeng1, LI Qiang1,3.& MA Mingzhen1,2 1. Key Laboratory of Metastable Materials Science & technology of Hebei, Yanshan university, Qinhuangdao 066004, China 2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of technology, Harbin 150001, China 3. {3. of mechanical engineering, Yanshan university, Qinhuangdao 066004, China 4. Chinese Academy of engineering, Beijing 10003., China 1. Key Laboratory of Metastable Materials Science & technology of Hebei Yanshan University 066004 Qinhuangdao China 2. college of mechanical engineering Yanshan University 066004 Qinhuangdao China 3. Chinese Academy of engineering 100038 Beijing China 4. National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology 150001 Harbin China

mechanical properties of the Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy at different temperatures were investigated. The compression test was carried out on a Gleebe-3.00 machine at 3.5 and 3.5°C, respectively, in the supercooled liquid region. It is shown that decreasing the compressive rate and increasing temperature have a similar influence trend on the compressive behavior of the bulk amorphous alloy. Room and low temperature tensile strengths were tested on the Instron materials testing system. At low temperature, the tensile strength decreased with decreasing of the testing temperature. Hardness measurement indicated that below the glass transition temperature, the hardness decreased with increasing of the annealing temperature and duration time. It, however, increased when the annealing treatment was performed above the glass transition temperature.

关键词： Zr41Ti14Cu12.5Ni10Be22.5 bulk amorphous alloy, mechanical properties, compressive deformation.

Study on H atoms diffusion and adsorption properties of MgH_2-V systems

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第7期51卷 979-988页

作者： ZHOU DianWu1,2, LIU JinShui3.& PENG Ping3.1 State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan university, Changsha 410082, China 2 college of mechanical and Automatic {3., Hunan university, Changsha 410082, China 3.college of Materials Science and {3., Hunan university, Changsha 410082, China 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha 410082 China 2. college of mechanical and Automatic engineering Hunan University Changsha 410082 China 3. college of Materials Science and engineering Hunan University Changsha 410082 China

Based on experimental results that VH0.81/MgH2 interface was found during the process of mechanically milling MgH2+5at.%V nanocomposite, H atoms diffusion and adsorption properties of MgH2-V systems have been investigated by using a first-principles plane-wave pseudopotential method based on the density functional theory. The results are as follows. When VH/MgH2 interface is formed due to V alloying MgH2 phase, the vacancy formed by H atoms near VH phase region is more stable than that without V alloying, while vacancy near MgH2 phase region is less stable than that without V alloying. During the process of H atoms diffusion after V alloying, the max migration barrier energy of H atoms in MgH2-V systems is reduced compared with that of MgH2 phase, which means that H atoms diffuse easily. When H diffuses into VH from MgH2 across VH/MgH2 interface, among three substitutions such as the replacement of H for V vacancy, or interstitial site or V atoms, the replacement of H for V vacancy has the strongest diffusion ability, next interstitial site, and finally V atoms site. As far as H adsorbed on different surfaces of VH phase is concerned, physical adsorption is carried out more easily than chemical adsorption, and the behavior of H atoms adsorbed on the surface near VH phase region can be found more easily than that near MgH2 phase region.

关键词： plane-wave pseudopotential theory magnesium hydride diffusion adsorption

Parameters Relevant to Bubble Detachment when Gas-injecting into Polymer Melt Flow Field

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) 2005年第1期20卷 68-71页

作者：陈再良 college of mechanical and Electrical engineering Soochow University Suz hou 215021 China

The bubble deformation processes were reported when gas was injected into polyme r melt flow field in another paper, the experiments showed that the deformation was severely affected by the volume of the bubble, and in turn, for the different bubbles, several different deformation processes were presented d uring their movement along the flow channel. In addition, we could find that the magnitude of the bubble volume was dependent upon the pressure difference of th e gas injection pressure and the melt pressure. In this paper, more experimental conditions were changed to investigate the parameters relevant to the detachmen t of bubbles from the injection nozzle. The experimental results show that the p ressure difference, the melt flow velocity as well as the melt pressure were all critical for the parameters, such as the bubble detachment time, the maximum bu bble diameters and the magnitude of the bubble volume. The morphology changes of bubble were very large when the flow field was abruptly changed, and the situat ions were more complicated.

关键词： bubble morphology detachment time geometry parameters flow field

Multi-agent Based Modeling of Manufacturing Network

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2006年第S1期28卷 381-387页

作者： GUO Yuming,SUN Yanming,ZHENG Shixiong (School of mechanical engineering,south China {3. of technology,guangzhou 510641,China) School of mechanical engineering South China University of TechnologyGuangzhou 510641China

An intelligent manufacturing system is modeled currently from the viewpoint of manufacturing applications,and the network platform’s influence to manufacturing applications is not considered adequately. However any bottleneck in service oriented architecture (SOA) for the manufacturing network can affect the agility of the IT environment. In this paper,to achieve a trade-off between manufacturing resources and network resources,the manufacturing network is modeled with multi-agent,in which two kinds of basic elements,the manufacturing application unit and the network carrier of manufacturing information,are presented. And their main characters are described by colored petri net. The manufacturing application model drives the network platform that inversely provides this application model technology supports. The proposed multi-agent system is demonstrated through an example integration scenario involving production plan,resources management and execution subsystems. And the result suggests that analyzing and designing the system architecture of networked manufacturing should give due attention to the operation system as well as manufacturing applications.

关键词： manufacturing network model multi-agent colored petri net SOA

The Vibration Controllability of 20~# Steel Pipe Excited by Unsteady Flow

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) 2011年第6期26卷 1222-1226页

作者：寇子明 college of mechanical engineering Taiyuan University of Technology Shanxi Province Mine Fluid Control engineering Research Center

An excited experiment system of 20# steel pipe was established with oil cylinder, 20# steel pipe, frequency converter, pump station and wave exciter generating unsteady flow artificially. The experimental results showed that the 20# steel pipe could vibrate with the excitation of unsteady flows, and the vibration was periodic, instead of a harmonic one. Particles on the front and rear positions of pipe vibrated synchronously, and the vibration intensity of the pipe＇s two ends was greater than in the middle. System pressure and wave exciter＇s frequency had much influence upon pipe＇s amplitude. Pipe＇s vibration frequency was little affected by system pressure, and its value was close to the wave exciter＇s. Therefore, the active control of pipe＇s vibration can be realized by setting system pressure and adjusting frequency converter＇s frequency.

关键词： unsteady flow steel pipe vibration control wave exciter

Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第9期53卷 1435-1443页

作者： LIU HongTao1,2,3.& GE ShiRong1,3.1 Institute of Tribology and Reliability engineering, China university of Mining & technology, Xuzhou 221116, China 2 {3. of mechanical and Electrical engineering, China university of Mining & technology, Xuzhou 221116, China 3.Biotribology Center, State Key Laboratory of Tribology, Xuzhou 221116, China Institute of Tribology and Reliability engineering China University of Mining & Technology Xuzhou 221116 China college of mechanical and Electrical engineering China University of Mining & Technology Xuzhou 221116 China Biotribology Center State Key Laboratory of Tribology Xuzhou 221116 China

MiaoXAM2.5X-50X Ultrahigh Precision Surface 3. Profiler is introduced to research the relations be- tween thickness of UHMWPE’s wear debris and positive pressure of tribological system. Research re- sults show that thickness of wear debris owns evident classification, and the first grade thickness math model and the second grade thickness math model are built. By the second grade thickness math model, the true force condition in the tribological system can be gotten, and the model can be used as a tool to modify simulating parameters of the tribological system, and it is an important inspecting method to the airtight system which cannot be examined in real time. The first grade thickness math model can describe the true working load and surface condition of work piece in the tribological sys- tem, and is an effective description method for the running condition of frictional pairs. The research results at different lubricating conditions testify the relations between thicknesses of wear debris and positive pressure of the tribological system. The fractal relation between maximal thickness of wear debris and positive pressure is discussed. The conceptions of the immutability principle and charac- teristic granularity of wear debris thickness are brought forward and discussed. In conclusion, as a stable tribological parameter owning mechanical theory basis, wear debris thickness will play an im- portant part in fault diagnosis, especially for the airtight system such as artificial joint.

关键词：摩擦学磨损面厚度分形数学模型