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EIGENVALUE EXTRAPOLATION FORBIQUADRATIC FINITE ELEMENT APPROXIMATION IN RECTANGULAR DOMAIN

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Systems science and Mathematical sciences 1997年第1期10卷 28-32页

作者： LUO Ping (Institute of Mathematics, Academia Sinica, beijing 100080, china)

In this paper, we consider the model eigenvalue problem with the biquadratic finite element. We have obtained the following extrapolation estimate of the

关键词： Finite element mathod biquadratic element eigenvalue extrapolation

Experimental study on three dimensional movements of particles Ⅱ Effects of particle diameter on turbulence characteristics

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International Journal of Sediment Research 2009年第2期24卷 169-176页

作者： Limo TANG1 and Xingkui WANG2 1State Key Laboratory of Hydrology-Water Resources and Hydraulic engineering,Hohai University, Nanjing 210098,china 2 Prof.,State Key Laboratory of Hydroscience and engineering,Tsinghua University,{4. 100084.china State Key Laboratory of Hydrology-Water Resources and Hydraulic engineering Hohai University Nanjing 210098 China State Key Laboratory of Hydroscience and engineering Tsinghua University Beijing 100084 China

Based on the 3D PTV(Particle Tracking Velocimetry) measuring system,the 3D movement characteristics of particles with four different diameters were investigated. Under specific flow conditions,the impact of particle diameters on 3D motion of particles was studied,and the turbulence characteristics were analyzed by different statistical methods. The results showed that the turbulence intensity of coarse particle decreased as the diameter increased. In near wall region,the probability density distributions of longitudinal and vertical fluctuation velocities both deviated from the normal distribution;while in the outer region,the probability density distribution of vertical fluctuation velocity approximately agreed with the normal distribution.

关键词： Particle diameter Turbulence Probability density distribution

An Useful Communication Mechanism for Distributed Agents-Based Intrusion Detection System

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Wuhan University Journal of Natural sciences 2006年第6期11卷 1801-1804页

作者： DU Ye School of Computer and Information Technology Beijing Jiaotong University Beijing 100044 China

The communication mechanism plays an important role in an intrusion detection system, while it has not been paid enough attention. Based on analyzing the actual facts and expatiating upon the requirements a communication mechanism needs to meet, a message driven communication mechanism is proposed in this paper. The protocol presented here is divided into three layers： entity level, host level, and network level. The communication processes are also designed in detail. Experiments illustrate that cooperative entities can detect distributed sophisticated attacks accurately. Furthermore, this mechanism has the advantages like high reliability, low time delay and expenses.

关键词： communication intrusion detection system cooperation model protocol

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门窗封条装配机器人工作站

机器人 2000年第1期22卷 64-66页

作者：郗安民刘颖北京科技大学机电工程研究所 100083

铝合金门窗已经广泛用于各种建筑中，这里介绍怎样使用工业机器人装配铝框和玻璃之间密封橡皮条的技术．

关键词：装配密封条机器人工作站工业机器人门窗

On the Asymptotic Behavior of Nonlinear Schrodinger Equations with Magnetic Effect

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Acta Mathematica Sinica,English Series 1995年第2期11卷 179-187页

作者： Guo Boling Tan Shaobin Institute of Applied Physics and Computational Mathematics Academia Sinica beijing, 100088 china Institute of Applied Physics and Computational Mathematics Academia Sinica Beijing People's Republic of China

The purpose of this paper is to study the long time asymptotic behavior for a nonlinear Schrdinger equations with magnetic effect. Under certain conditions, we prove the existence and nonexistence of the non-trivial f... 详细信息

关键词： Math On the Asymptotic Behavior of Nonlinear Schrodinger Equations with Magnetic Effect

Detect early stage lung cancer by a LAMP microfluidic chip system with a real-time fluorescent filter processor

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science china Chemistry 2012年第4期55卷 508-514页

作者： WANG TongZhou1, ZHANG Ye1, HUANG GuoLiang1,2,3, WANG Can2, XIE Lan1, MA Li2, LI ZhiYong2, LUO XianBo2, TIAN Hao2, LI Qiang1, LI Xin1, LV ZhouYan1 & BAO XiaoFan11Department of Biomedical engineering, School of Medicine, Tsinghua University, beijing 100084. china 2National engineering Research Center for beijing Biochip Technology, beijing 102206, china 3Yangtze Delta Region Institute of Tsinghua University, Hangzhou 3304.1, china 1. Department of Biomedical engineering School of Medicine Tsinghua University Beijing 100084 China2. National Engineering Research Center for Beijing Biochip Technology Beijing 102206 China3. Yangtze Delta Region Institute of Tsinghua University Hangzhou 330401 China

This work presents a promising clinical molecular diagnostics for early stage lung cancer. This novel diagnostic method utilized the loopmediated isothermal amplification （LAMP）, micro fluidic chips and a confocal optical detector with a nonlinear fluorescent filter processor. An isothermal amplification based microfluidic chip for the early diagnostics of lung cancer was developed and a confocal optical detector was improved by a novel real-time fluorescent filter to sensitively monitor the DNA amplification procedure with high signal to noise ratio and fluorescence collecting ability. Experiment showed that a rapid diagnostic of lung cancer by detecting the existence of the CEA mRNA could be performed in only 5 laL of reaction assay in less than 4. min. While the traditional intube RTPCR set consumed more than 25 -μL of the assay and took more than 90 rain.

关键词： microfluidic chip – isothermal amplification – lung cancer – confocal detection – non linear filter

Fast　Ignition　and　Stable　Combustion　of　Coarse　Coal　Particles　in　a　Nonslagging　Cyclone　Combustor

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Journal of Thermal science 1995年第2期4卷 136-140页

作者： Biao Zhou X. L.Wang R. X. Li Lixing Zhou(Department of engineering Mechanics, Tsinghua University, beijing 100084. china) Department of engineering Mechanics Tsinghua University Beijing China

A combustion set-up of an innovative nonslagging cyclone combustor called 'Spouting-Cyclone Combustor (SCC)' ) with two-stage combustion, organized in orthogonal vortex flows, was established and the experimental studies on the fast ignition and stable combustion of coarse coal particles in this combustor were carried out. The flame temperature versus ignition time and the practical faSt ignition procedure were obtained; The stable coal combustion can be achieved after a short period ignition, and the temperature fields in SCC were obtained. These results show that it is possible to obtain highly efficient and clean combustion of unground coal particles by using this technology.

关键词： coal combustion coal ignition cyclone combustor.

Recent progress in interface modification for dye-sensitized solar cells

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science china Chemistry 2010年第8期53卷 1669-1678页

作者： MA BeiBei,GAO Rui,WANG LiDuo,ZHU YiFeng,SHI YanTao,GENG Yi,DONG HaoPeng & QIU Yong Key Lab of Organic Optoelectronics & Molecular engineering of Ministry of Education Department of Chemistry,Tsinghua University,beijing 100084.china 1. Key Lab of Organic Optoelectronics & Molecular engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 China

Interface modification on the TiO2/dye/electrolyte interface of dye-sensitized solar cells (DSCs) is one of the most effective approaches to suppress the charge recombination,improve electron injection and transportation,and thus ameliorate the conversion efficiency and stability of *** research focusing on the photoanodes interface modification before sensitization in dye-sensitized solar cells has been carried out and ***,recent studies showed that post-modification after sensitization of the TiO2 electrode also plays a significant role on the TiO2/dye/electrolyte *** post-modification using the immersing method could deprotonate dye molecules,prohibit the dye aggregation and retard the recombination *** a result,it has great influence on the devices' photovoltaic *** interface modification could also provide an approach to broaden the response of the solar spectrum by introducing an alternative assembling *** in-situ meaning of using a co-adsorbent is employed to modify the interface in the DSCs,which could retard the aggregation of the dye molecules and enhance the conversion *** addition,electrolyte additives can be used to modify the TiO2/dye/electrolyte interface through some unique *** on the background of interface modification of photoanodes before sensitization,this review introduces various interface modifications after sensitization of dye-sensitized solar cells and their mechanisms.

关键词： dye-sensitized solar cell TiO2 electrode interface modification electron recombination

Incipient mechanical fault detection based on multifractal and MTS methods

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Petroleum science 2009年第2期6卷 208-216页

作者： Hu Jinqiu Zhang Laibin Liang Wei Wang Zhaohui School of Mechanical and Electronic engineering China University of Petroleum Beijing 102249 China

An incipient mechanical fault detection method, combining multifractal theory and Mahalanobis-Taguchi system （MTS）, which is based on statistical technology, is proposed in this paper. Multifractal features of vibration signals obtained from machine state monitoring are extracted by multifractal spectrum analysis and generalized fractal dimensions. Considering the situation of mass samples of normal mechanical running state and few fault states, the feature parameters corresponding to different mechanical running states are further optimized by a statistical method, based on which incipient faults are subsequently identified and diagnosed accurately. Experimental results proved that the method combining multifractal theory and MTS can be used for incipient fault state recognition effectively during the mechanical running process, and the accuracy of fault state identification is improved.

关键词： Incipient fault fault detection multifractal Mahalanobis-Taguchi system (MTS)