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The sliding friction of UHMWPE modified by Schiff base copper (II) complex tested at low speeds

Mocaxue Xuebao/Tribology 2010年第5期30卷 453-460页

作者： Wu, Li Gao, Xin-Lei Gao, Wan-Zhen Wuhan Research Institute of Materials Protection Wuhan 430030 China Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan 430073 China Hubei Key Lab. of Novel Reactor and Green Chemical Technology Wuhan Institute of Technology Wuhan 430073 China Department of Chemical and Environmental Engineering Wuhan Polytechnic University Wuhan 430023 China

Influences of normal load, sliding speed and sliding duration on friction coefficient of ultrahigh molecularweight polyethylene (UHMWPE) modified by 5%, 10% and 15% copper (II) complex in mass fraction of bissalicylaldehyde-ethylenediamine (Schiff base copper (II) complex) respectively were investigated on a microtribometer in a speed range of 50~1600 μm/s under conditions of dry friction and vegetable oil lubricated condition. A 100Cr6 steel ball was used as counterpart. Pure UHMWPE was also tested as a reference. Results showed that the friction coefficient of modified UHMWPE with 5%~15% (mass fraction) Schiff base copper (II) complex was independent from normal load at low sliding speeds in dry condition or using vegetable oil as a lubricant. And it was much lower than that of pure UHMWPE, i. e. the friction coefficient of all modified UHMWPE in dry condition had a 29% reduction as compared to that of pure UHMWPE. The results also showed that the effect of sliding speed on friction coefficient under the lubricated condition could be decreased as the content of Schiff base copper (II) complex in the modified UHMWPE was high enough, e. g. 15%. The results showed that the friction coefficient of modified UHMWPE with 5%~15% Schiff base copper (II) complex was independent from sliding speed and sliding duration under dry condition. The stable friction coefficient of the modified UHMWPE at low speeds under dry sliding can meet the requirement of frictional pair for the nanopositioning application.

关键词： Tribology

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Dynamic FE simulation of large-scale single-layer spherical shell with viscoelastic dampers

Dynamic FE simulation of large-scale single-layer spherical ...

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2009 Joint International Conference on Modelling and Simulation

作者： Yuan, Ping Li Wei, Zhang Key Lab. of Disaster Forecast and Control in Engineering Ministry of Education China Jinan University China Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9781846260612

A vibration reduction system of viscoelastic dampers is introduced into Kewitte single-layer latticed spherical shell (D=60m). Through dynamic FE simulation, the stability of controlled shell and the correspondent uncontrolled one is compared. The different vibration schemes with initial geometric imperfection under different earthquake loadings are especially investigated. The results show that Liapunov stability of controlled shell with viscoelastic dampers can be evidently improved when compared with the uncontrolled shell;the vibration reduction is more obvious when considering the initial geometric imperfection of the shell. The damper's parameters have great influence on the vibration control effort.

关键词： Stability

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Analyzing market shares of competitive public transportation pivotal facilities with a continuous equilibrium modeling approach

Analyzing market shares of competitive public transportation...

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6th International Conference on Fuzzy Systems and knowledge Discovery, FSKD 2009

作者： Du, Yuchuan Sun, Lijun Wong, S.C. Key Lab. of Road and Traffic Engineering Ministry of Education Tongji University Shanghai China Department of Civil Engineering University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)9780769537351

Before constructing a new public transportation pivotal facility, an important problem is to estimate and analyze the market share or attracting area of this transportation facility. In this paper, a multi-class continuous equilibrium model is given and proved to satisfied user equilibrium condition and other constraint conditions. The case of traveler choice behavior is considered. An efficient iterative method using finite element technique is proposed. The optimal model can be solved by this method. Finally, a numerical example is illustrated to demonstrate the feasibility and effectiveness of the proposed methodology. © 2009 IEEE.

关键词： Iterative methods

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Study on the RE2O3-Mo secondary electron emitters

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作者： Liu, Wei Wang, Jinshu Gao, Fei Li, Na Li, Hongyi Zhou, Meiling Zuo, Tieyong Key Lab. of Advanced Functional Materials Ministry of Education China School of Materials Science and Engineering Beijing University of Technology Beijing 100022 China

ISBN: (纸本)3908451655

A systematic investigation of the fabrication process, microstructure and treatment technology of the Rare earth oxide doped Mo cermet (REO-Mo in brief) on the secondary electron emission (SEE) mainly has been performed. The REO-Mo samples were fabricated by liquid-liquid, Liquid-Solid and Liquid-Liquid doping method and subsequently by the Spark Plasma Sintering (SPS) techniques. It was found that the uniform mixing of REO with Mo would have considerable benefit for enhancement of SEE coefficient (δ). Annealing the cathode in hydrogen (called as the pre-activation treatment) could greatly improve the SEE performance by removing the absorbed water and oxygen at the cathode surface which might cause the oxidation of molybdenum during cathode high temperature operation. It is found that the activation temperature of REO-Mo cathode annealed in hydrogen could decrease to 1000°C, about 300°C lower than that of the cathode without pre-activation treatment, which is favorable for the practical application. © (2009) Trans Tech Publications.

关键词： Rare earths

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Simulation analysis of merging area on urban expressway in alternate rules based on cellular automata model

Simulation analysis of merging area on urban expressway in a...

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9th International Conference of Chinese Transportation Professionals, ICCTP 2009: Critical Issues in Transportation System Planning, Development, and Management

作者： Fang, Shun Zhang, Xiaoning Zhang, H.M. Key Lab. of Road and Traffic Engineering in the Ministry of Education Tongji University Shanghai 200092 China Department of Civil and Environment Engineering University of California Davis CA 95616 United States

ISBN: (纸本)9780784410646

Merging area is a typical type of carrying out merging on urban expressway;It is usually a traffic congested bottleneck. Under the heavy traffic demand, it easily occurs when vehicles on the mainline and on ramp contesting the right way without any regulation, and making the 'forced entry' manoeuvre at the junction of merging area. This disturbance results in a severe decrease of traffic capacity. The alternate traffic rules, however, could make an orderly merging. Starting from analysis of merging mechanism, the comparative traffic flow models are established based on the Cellular Automata Model, using alternate rules or no alternate rules. The effects of a new alternate strategy are obtained by numerical simulation. Finally, this paper presents a conclusion that traffic state with these rules is much better than not using these rules, and the capacity is improved to some extent as well.

关键词： Merging

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The Electronic Records Management in E-government Strategy: Case Studies and the Implications

The Electronic Records Management in E-government Strategy: ...

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International Conference on Networking and Digital Society, ICNDS

作者： Xiaomi An Key Laboratory of Data Engineering and Knowledge Engineering Ministry of Education Renmin University of China Beijing China

Electronic records management (ERM) is fundamental to good governance, business efficiency and effectiveness of e-government in networking and digital society. However, government authorities in China has faced many challenges in managing electronic records. A study of ERM in e-government strategy in other countries would be significant to support development of ERM in Chinese e-government strategy. As little is known from literature on the status of electronic records management in e-government strategy, this paper selects U.S, New Zealand and UK for case study by means of collecting and analyzing publications, laws, regulations and policies relevant to both electronic records management and e-government strategy. The author first analyzes status of ERM in e-government strategy and then discusses models and driving forces of their existences. The result of the study revealed that electronic records are managed as national assets, resources and trusted information in the e-government strategy. Driven by core business of e-government in different country, there are different approaches to ERM in e-government strategy. The implications of the study is that, to position ERM in e-government strategy, it is significant to provide a strategic approach to ERM for shared agenda by both government authorities and records management professionals. The findings intended to be of use to both the effective e-government strategy and good ERM for dynamic, interactive and proactive citizen-centered services across domains and time dimensions.

关键词： Electronic government Conference management knowledge management engineering management Law data engineering knowledge engineering Asset management Resource management Sustainable development

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A probabilistic evaluation of fitness based immune chaotic algorithm for constraint optimization problems

A probabilistic evaluation of fitness based immune chaotic a...

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5th International Conference on Natural Computation, ICNC 2009

作者： Yan, L.-J. Li, Z.-B. Yuan, X.-Y. State Key Lab. of Manufacturing Systems Engineering Xi 'An Jiaotong University Xi 'an 710049 China Key Lab. of Education Ministry for Modern Design Rotor-bearing System Xi 'An Jiaotong University Xi'an 710049 China

ISBN: (纸本)9780769537368

Multidisciplinary collab.rative decision of product design is modeled as a constraint satisfaction problem and a new hybrid algorithm which combined chaotic search with immune algorithm is developed to solve the model. The meticulous searching capability of chaotic algorithm can keep immune algorithm from stunning into local optimum and find global optimal design solution. For the fitness evaluation of antibody, a probabilistic method was adopted to deal with constraints in place of traditional punishment function approach, thus the problem that the punishment coefficient is difficult to determine can be solved effectively. Optimization design result of a rotor system validated correctness and efficiency of hybrid algorithm. © 2009 IEEE.

关键词： Constrained optimization

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Effect of different support structure on the characteristic of the grating light modulators

Effect of different support structure on the characteristic ...

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2009 International Conference on Optical Instruments and Technology, OIT 2009

作者： Wei, Wei Weiminga, Chen Yong, Zhu Ninga, Wang Yi, Qin Jiea, Zhang Key Lab. of Opto-electronic Technology and Systems Education Ministry of China Chongqing 400044 China Opto-electronic Engineering College Chongqing University Chongqing 400044 China

ISBN: (纸本)9780819478962

The energy method is applied in the analysis of the elastic coefficients of the crab-leg beam and the guided-end beam under the micro-nano-scale, the theoretical formula of the elastic coefficient is got. By considering the elastic coefficient caused by the residual stress and the edge effect of the capacitors, the static electrical and mechanical model of the grating light modulators is established. According to the static electrical and mechanical model and the actual design parameters, the pull-in voltage of the GLM with crab-leg beam is 7.2 V and the pull-in voltage of the GLM with guided-end beam is 9.5 V. The experimental system is built to test the performance of the grating light modulator. By using this experimental system, the pull-in voltage of the GLM with crab-leg beam is 7.6 V and the pull-in voltage of the GLM with guided-end beam is 10.2V. © 2009 SPIE.

关键词： Light modulators

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A unique multi-functional landmark for autonomous navigation

A unique multi-functional landmark for autonomous navigation

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5th International Conference on Natural Computation, ICNC 2009

作者： Wang, Dan Jia, Yunwei Cao, Zuoliang Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Ministry of Education China School of Mechanical Engineering Tianjin University of Technology China

ISBN: (纸本)9780769537368

To save time, improve flexibility and guarantee accuracy of the navigation system of the mobile robots, a multifunction landmark and a new navigation algorithm are proposed in this paper. With the new algorithm and landmark the mobile robots can be located by only a single landmark, and can be navigated in a large area by serial landmarks. The simple configuration and the convenient material of the landmark increased the system 's flexibility and decreased the complexity of the algorithm. From the experimental results it can be concluded that the navigation system has fast navigation speed and high navigation accuracy. © 2009 IEEE.

关键词： Navigation systems

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Off-axis directional acoustic wave beaming control by an asymmetric rubber heterostructures film deposited on steel plate in water

Off-axis directional acoustic wave beaming control by an asy...

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2009 IEEE International Ultrasonics Symposium, IUS 2009

作者： Cai, Feyan Zheng, Hairong He, Zhaojian Liu, Zhengyou Wang, Ji Paul.C.Lauterbur Research Center for Biomedical Imaging IBHE Key Lab. of Biomedical Informatics and Health Engineering Shenzhen Guangdong China Key Lab. of Acoustic and Photonic Materials and Devices Ministry of Education Wuhan University Wuhan China Piezoelectric Device Lab. School of Mechanical Engineering and Mechanics Ningbo University Ningbo Zhejiang China

ISBN: (纸本)9781424443895

We numerically report a design of an off-axis directional beaming of acoustic wave, by placing a point acoustic source near the surface of an asymmetrical rubber heterostructures film deposited on steel plate in water. The rubber heterostructures film at left side and right side are constructed by alternately stacking rubber-1 and rubber-2 film periodically with different width percentages. The mechanism of the off-axis directional beaming is due to the surface acoustic resonances asymmetrically modulated by elastic properties of the rubber heterostructures. The deviation beaming angle is determined by the difference between the width percentages of rubbers in left and right side. The structure would have potential applications on a variety of acoustic compacted devices, such as non-destructive testing of materials, medical ultrasound instrumentation and etc. ©2009 IEEE.

关键词： Finite difference time domain method

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