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International Conference on BioMedical engineering and Informatics (BMEI)

作者： Ming Li Guoliang Xu Carlos O. S. Sorzano Roberto Melero Chandrajit Bajaj State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics Academy of Mathematics and System Sciences Chinese Academy and Sciences Beijing China Biocomputing Unit. Centro Nacional de Biotecnologia CSIC Campus University Autonoma Madrid Mexico Austin Department of Computer Sciences and Institute of Computational Engineering & Sciences University of Texas Austin Austin TX USA

In this paper, we present a stable, reliable and robust method for reconstructing a three dimensional density function from a set of two dimensional electron microscopy images. By minimizing an energy functional consisting of a fidelity term and a regularization term, a L 2 -gradient flow is derived. The flow is integrated by a finite element method in the spatial direction and an explicit Euler scheme in temporal direction. The experimental results show that the proposed method is efficient and effective.

关键词： Image reconstruction Spline Three dimensional displays Adenoviruses Microscopy Finite element methods

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Characteristics of pyrolytic topping in fluidized bed for different volatile coals

Characteristics of pyrolytic topping in fluidized bed for di...

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20th International Conference on Fluidized Bed Combustion

作者： Xiong, R. Dong, L. Xu, G.W. State Key Laboratory of Multi-Phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

Coal is generally combusted or gasified directly to destroy completely the chemical structures, such as aromatic rings containing in volatile coals including bituminite and lignite. Coal topping refers to a process that extracts chemicals with aromatic rings from such volatile coals in advance of combustion or gasification and thereby takes advantage of the value of coal as a kind of chemical structure resource. CFB boiler is the coal utilization facility that can be easily retrofitted to implement coal topping. A critical issue for performing coal topping is the choice of the pyrolytic reactor that can be different types. The present study concerns fluidized bed reactor that has rarely been tested for use in coal topping. Two different types of coals, one being Xiaolongtan (XLT) lignite and the other Shanxi (SX) bituminous, were tested to clarify the yield and composition of pyrolysis liquid and gas under conditions simulating actual operations. The results showed that XLT lignite coals had the maximum tar yield in 823-873K and SX bituminite realized its highest tar yield in 873∼923K. Overall, lignite produced lower tar yield than bituminous coal. The pyrolysis gas from lignite coals contained more CO and CO2 and less CH4, H2 and C2+C 3 (C2H4, C2H6, C 3H6, C3H8) components comparing to that from bituminous coal. TG-FTIR analysis of tars demonstrated that for different coals there are different amounts of typical chemical species. Using coal ash of CFB boiler, instead of quartz sand, as the fluidized particles decreased the yields of both tar and gas for all the tested coals. Besides, pyrolysis in a reaction atmosphere simulating the pyrolysis gas (instead of N2) resulted also in higher production of pyrolysis liquid.

关键词： Fluidized beds

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Collapse and Revival of an Atomic Beam Interacting with a Coherent state Light Field

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Chinese Physics Letters 2009年第12期26卷 87-90页

作者：李犇陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Engineering and Computer Science Peking University Beijing 100871

We report on the phenomena of the periodic spontaneous collapse and revival in the dynamics of an atomic beam interacting with a single-mode and coherent-state light field. Conventional collapse and revival by Eberly et al. [Phys. Rev. Lett. 44（1980）1323 ] are presented in the case of the evolution with time of the population inversion. Here, we study the evolution with coupling strength of population inversion. We define the collapse and revival coupling strengths as characteristic parameters to describe the above collapse and revival. Furthermore, we present the analytic formulas for the population inversion, the collapse and revival coupling strengths.

关键词： Atomic and molecular physics Optics quantum optics and lasers

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Stratagem-research (SR) methodology and the meta-synthetic integrated environment of SR

Stratagem-research (SR) methodology and the meta-synthetic i...

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20th IASTED International Conference on Modelling and simulation, MS 2009

作者： Ji-Cai, Wei Jing, Zhang Wei, Zhao Beijing Institute of System Engineer State Key Lab. for Complex Systems Simulation China Post Box. 970219 Beijing 100101 China

ISBN: (纸本)9780889867994

The strategic issue is looked on as the complex system in this paper. Firstly, the essential characteristics of stratagem research (SR) are discussed. Then the stratagem research methodology is brought forward and constructed. Finally, under the guidance of the combination of qualitative and quantitative methods, the meta-synthetic integrated environment of SR is designed, realized and applied to solve the stratagem research problem.

关键词： complex system Meta-synthetic integration Methodology Stratagem

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ROBUSTNESS ANALYSIS OF LEADER-FOLLOWER CONSENSUS

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Journal of systems Science & complexity 2009年第2期22卷 186-206页

作者： Jinzhi WANG Ying TAN · Iven MAREELS State Key Laboratory for Turbulence and Complex System and Department of Mechanics and Aerospace Engi-neering College of Engineering Peking University Beijing 100871 China. Departmen~ of Electrical and Electronic Engineering University of Melbourne Melbourne VIC. 3010 Aus-tralia.

In this paper,robustness properties of the leader-follower consensus are *** of presentation,the attention is focused on a group of continuous-time first-order dynamicagents with a time-invariant communication topology in the presence of communication *** orderto evaluate the robustness of leader-follower consensus,two robustness measures are proposed:the L_2gain of the error vector to the state of the network and the worst case L_2 gain at a *** L_2 gain of the error vector to the state of the network is widely used in robust control design andanalysis,the worst case L_2 gain at a node is less conservative with respect to the number of nodes inthe *** is thus suggested that the worst case L_2 gain at a node is used when the robustnessof consensus is *** analysis and simulation results show that these two measuresare sensitive to the communication *** general,the 'optimal' communication topology thatcan achieve most robust performance with respect to either of the proposed robustness measures isdifficult to characterize and/or *** the in-degree of each follower is one,it is shown thatboth measures reach a minimum when the leader can communicate to each node in the network.

关键词： Communication errors leader-follower consensus robustness.

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IGBT modeling for analysis of complicated multi-IGBT circuits

IGBT modeling for analysis of complicated multi-IGBT circuit...

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2009 2nd Conference on Power Electronics and Intelligent Transportation system, PEITS 2009

作者： Deng, Yi Zhao, Zhengming Yuan, Liqiang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781424442461

A new IGBT (Insulated Gate Bipolar Transistor) model for simulation of eomplicated multi-IGBT cireuits is presented. Based on the gate chargc and discharge behaviors of IGBT, it piecewise models the turn-on and -off transient oflGBT, and simulates the static characteristics with curve fitting method . With the kcy features of high simulation spccd, easy parameters extraction and clear physical meaning, the model is available for various IGBTs and system level circuits. This paper describes the structure and equivalent circuit of the model in detail, implements it with the simulation tool of PSIM package, and determines the parameters of the model for an IGBT of FF300R12ME3 as an example. The accuracy of the model is verified by the comparison between the simulated and experimental results. ©2009 IEEE.

关键词： Equivalent circuits

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Preparation and Photocatalytic Property of Porous TiO_2 Film with Net-like Framework

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Chemical Research in Chinese Universities 2009年第1期25卷 95-97页

作者： XU Rong-guo YAO Jian-xi LAI Xiao-yong MAO Dan XING Chao-jian WANG Dan State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 P. R. China Graduate University of Chinese Academy of Sciences Beijing 100049 P. R. China

By the UV-curing method, a porous TiO2 film with net-like framework has been prepared. The characterization results of the porous TiO2 film by means of SEM, TEM, XRD, and N2 adsorption-desorption analysis show that the net-like framework of the porous TiO2 film is composed of TiO2 nanoparticles, forming three dimensional porous structure. The porous TiO2 film exhibits higher photocatalytic activity for the degradation of methylene blue（MB） dye compared with the conventional dense TiO2 film.

关键词： UV-curing TiO2 Porous film Photocatalytic activity

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Flow-rate Characteristics Measurement of Regulators Based on the Pressure Response in an Isothermal Tank

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Chinese Journal of Mechanical engineering 2009年第5期22卷 633-638页

作者： FAN Wei ZHANG Hongli WANG Tao PENG Guangzheng ONEYAMA Naotake Education Ministry Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing 100081 China School of Automation Beijing Institute of Technology Beijing 100081 China Electrical Engineering College Xinjiang University Urumchi 830046 China SMC Tsukuba Technical Center Ibaraki-ken 300-2493 Japan

Regulators are important components in pneumatic system, and their flow-rate characteristics are the key parameters for designers. According to the correlatively international standard and national standard of China, which describe the flow-rate characteristics measurement method of pneumatic regulators, the pressure and the flow are measured point by point, and then the flow-rate characteristics curve is plotted point to point. This method has some disadvantages, such as equipment complexity, much air consumption, and low efficiency. To settle the problems presented above, this paper puts forward a new high efficient and energy saving flow-rate characteristics measurement method of regulators, which is based on the pressure response when charging and discharging to an isothermal tank without any flow meters. The measurement principle, the system and the steps are introduced. And the tracking differentiator is used for the data processing of the pressure difference. Two typical kinds of regulators were experimentally investigated, and their flow-rate characteristics curves were obtained with the new and the conventional method, respectively. Comparatively, it＇s proved that this new method is feasible because it is not only able to meet the demand of the measurement precision, but also to save energy and improve efficiency. Compared to the conventional method, the new method takes only about 1/10 amount of time and consumes about only 1/30 amount of air. Hopefully it will be able to serve as an international standard of flow-rate characteristics measurement method of regulators.

关键词： regulator flow-rate characteristics isothermal tank charging and discharging once pressure response tracking differentiator energy saving and high efficiency

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Synthesis of Ordered Cubic Periodic Mesoporous Silica with High Hydrothermal Stability

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Chemical Research in Chinese Universities 2009年第5期25卷 773-774页

作者： LAI Xiao-yong TU Jin-chun WANG Hong DU Jiang YANG Mei MAO Dan XING Chao-jian WANG Dan LI Xiao-tian College of Materials Science and Engineering Jilin University Changchun 130012 P. R. China State Key Laboratory of Multi-phase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China

1 Introduction Since its first discovery in 1992, ordered mesoporous silica material with large pore size, high surface area, and high pore volume has attracted great attention for the potentially wide application in catalysis, adsorption, separation, and ion exchange, etc. However, the poor hydrothermal stability of mesoporous silica has limited its wide application in industry. Therefore, in the last 10 years, many studies have been dedicated to improving the hydrothermal stability of mesoporous silica. Xiao et al.

关键词： Mesoporous silica Hydrothermal stability Nanocasting Ia3d cubic structure

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Process analysis of lignite circulating fluidized bed boiler coupled with pyrolysis topping

Process analysis of lignite circulating fluidized bed boiler...

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20th International Conference on Fluidized Bed Combustion

作者： Wang, Baoqun Dong, Li Wang, Yin Matsuzawa, Y. Xu, Guangwen State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing China Research Laboratory IHI Corporation Ltd. Yokohama Japan

We developed a comprehensive process model in ASPEN Plus to simulate the energy and mass balances of a lignite-fueled atmospheric circulating fluidized bed (CFB) boiler integrated with coal predrying and pyrolysis topping. In this model, it is assumed that the heat from exhausted flue gas was employed for coal predrying, and the sensible heat derived from circulated bed material was used for the pyrolysis topping (endothermic process). The simulation was conducted with respect to the Yunnan Kaiyuan CFB boiler, and two representative lignite coals from Xiao Long Tan (XLT) and Xin Shao (XS) were considered. The result shows that the predrying of coal with the sensible heat of above 363 K from flue gas, the amount of coal consumed in the boiler can be reduced by 3.5% and 5.3% for XLT lignite and XS lignite, respectively. It was also found that integration of pyrolysis topping with the boiler increased the coal consumption of the boiler, and the extent of consumption-increase varies with the yields of tar and gas in the pyrolysis topping process. For a gas yield of 5.2% and a tar yield of 5-6%, the consumption of XS lignite increased by about 20% comparing to that in the case without topping.

关键词： Pyrolysis

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