MechScience web for mechanician and mechanical science

Abstract: The geometric integration method of the dynamical system is an attractive direction in the last two decades. Dynamic equations of multibody systems, such as differential equation, differential-algebraic equation, are a kind of representative dynamical systems. The significance of the transformation from Lagrange framework to Hamilton framework is the configuration transformation from Euclidian to Hamiltonian. Then, the symplectic variable is introduced into the mechanics system, and the symplectic integration method can be adopted to solve the dynamic equations.

By using an ionic liquid of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, single-walled carbon nanotubes (SWNTs) were uniformly dispersed as chemically stable dopants in a vinylidene fluoride-hexafluoropropylene copolymer matrix to form a composite film. We found that the SWNT content can be increased up to 20 weight percent without reducing the mechanical flexibility or softness of the copolymer. The SWNT composite film was coated with dimethyl-siloxane-based rubber, which exhibited a conductivity of 57 S/cm and stretchability of 134 percent.

The following is a job imformation.Please contact chenyuan@ntu.edu.sg directly, don't contact me.

We seek a postdoctoral research fellow with keen interests in carbon materials for macroelectronics, to work with the research group of Dr. Chen Yuan at School of Chemical and Biomedical Engineering, Nanyang Technological University (NTU), Singapore.

This set of class notes, developed by W.D. Nix of Stanford University and used in a graduate course on Mechanical Properties of Thin Films, presented a wide range of thin film mechanics topics that are important for the integrated circuit (IC, such as RFID) and other thin film industries(such as Flexible Solar Cells). More applications can be found here.

There are many free mechanical luctures.http://worldofmz.blogspot.com/search/label/Mechanical. The following is main content, please click ther linkage and enjoy it.

The 4th Annual IEEE International Conference on Nano/Micro Engineered and Molecular Systemm(IEEE-NEMS) will be held in Shenzhen, China. IEEE-NEMS is a premier conference of the IEEE Nanotechnology Council to bring together world-leading researchers in the several focused topics of MEMS and Nanotechnology to disseminate their latest research results and allow cross-disciplinary exchange of knowledge to further advance both technological areas.

The exponential growth in integrated device density has yielded high-performance microprocessors containing almost 1 billion transistors per chip for the current 65 nm technology, up to now it is maybe 45nm technology. Continuous scaling of the devices and performance requires innovations in materials, processes, and designs for both back-end-of-line (BEoL) interconnects and packaging structures. Mechanical reliability has been a limiting factor for implementation of new materials and processes[1]. Electronic assemblies are the heart of all modern electronics.

    我国分析力学学科发展的里程碑——《约束系统动力学研究进展》：著名的哲人弗兰西斯.培根有一句脍炙人口的名言——“知识就是力量. 知识的力量不仅取决于其本身价值的大小，更取决于它是否被传播以及传播的深度与广度”.

内容概要

Report I Title：New mobile robot applications
报 告 人：Gurvinder Singh Virk, professor of Massey University(新西兰默西大学教授)
主 持 人：熊有伦 院士
时    间：2008年7月1日上午8:30
地    点：东八楼606会议室

Solar cells are devices that convert solar energy to electrical energy. The process in which the solar cell converts solar energy to electricity is called photovoltaic. Traditional solar cell is mostly made out of silicon, a well-known semi-conductor. When the sunlight hits the solar cell, photons from the sunlight is absorbed by the semi-conductor. The photons then hit the atoms causing electrons to be kicked out of atoms. The movement of electrons produces electricity (see figure).

功能曲面是一类具有特殊要求的曲面，它不仅要求几何形状的位置和形态精度，而且其必须满足其所要求的物理性能。在实际生产中功能曲面往往是一类复杂的自由曲面，它们不仅很难用二维图纸的方式准确表达，而且还包含了一些的物理约束和明确的物理意义。比如流曲线（stream surface）[1]，其曲面任意一点的单位切矢量和其经过的流体速度方向相同。功能曲面对产品的性能有着很大的影响, 比如发动机进气气道曲面对通过其中的气流流向和速度有很大的影响，而后者则可以直接影响到发动机中气油混合程度并决定发动机输出扭矩的大小。在实际生产实际中，采用逆向工程（reverse engineering/RE）『』的手段来重构功能曲面是一个主流的手段，因为RE方法较传统方法更加快速，灵活。整个逆向工程可以看作是一个信息的离散然后复原的过程，测量过程将目标实物离散成散乱的数据点，这是一个信息的退化过程，而重构过程就是在这些已有离散信息的基础上将原始连续的曲面信息求解出来。其中，按照通常处理的过程，又可以分为数据预处理，数据拼合，点云分割和曲面重构『』这个几个步骤。

The recognized authority for evaluating journals, Journal Citation Reports presents quantifiable statistical data that provides a systematic, objective way to evaluate the world's leading journals and their impact and influence in the global research community. In 2005, JCR Web, available via ISI Web of Knowledge, expanded its analytical capabilities beyond the journal level to include the subject category level.

 I am very honor to be a simple member of this wonderful web site,I am very earning to do something for science just before my birth,for my father is a science--sacrificing man,though he is dead now,so the rest is left to me.

I am just a college student of shangdong normal university,which is full of girls,leaving boys to be bachelors(maybe I spell it wrong).This school is very fun or funny actually.It is my third year of learning here just learning not study,for here only learning machine existing at least in my mind,I wanna study ,not just recite other man`s digest.

Multidisciplinary Design Optimization (MDO) can be defined as a formal methodology for the design of complex coupled systems in which the synergistic effects of coupling between various interacting disciplines/phenomena are explored and exploited at every stage of the design process. Why MDO?

London, United Kingdom, June 22-24, 2009, With the development of science and technology and with space exploration, hazardous environment work, and production requirements of small batch, short run and quick change-over, traditional concept of mechanisms and robots development are facing a challenge in the 21st century for adaptability and reconfigurability. Since 1990s, researchers are generating new ideas and concepts for new mechanisms and machines including robots for reconfigurability.