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Analysis of dipole-like ultra high frequency RFID tags close to metallic surfaces

Journal of Zhejiang University-science A(Applied Physics & engineering) 2009年第8期10卷 1217-1222页

作者： Ling-fei MO Hong-jian ZHANG Hong-liang ZHOU State Key Lab of Industrial Control Technology Department of Control Zhejiang University Hangzhou 310027 China

It is a challenge for passive RFID tags to be mounted on the surface of metal because the parameters of tag antennas,such as the impedance matching,the radiation efficiency and the radiation pattern,are seriously affected by the metallic *** paper presents the characteristics of the dipole-like antennas of ultra high frequency(UHF) radio frequency identification(RFID) tags that are placed close to metallic *** finite element method(FEM) and method of moment(MoM) were used to simulate the changes of the antenna parameters near the metallic *** typical dipole-like antennas close to the metallic surface,a closed loop antenna and a loaded meander antenna,were modeled,and the performance was *** was carried out and the results were in good agreement with the simulation,showing that a distance of 0.05λ～0.1λ(λ is the free space wavelength) from the metallic surface could make the dipole-like UHF RFID tag performance be acceptable.

关键词： Radio frequency identification （RFID） Tag Metallic surface Finite element method （FEM） Method of moment （MoM）

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Effects of allelochemical gramine on photosynthetic pigments of cyanobacterium microcystis aeruginosa

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World Academy of science, engineering and technology 2010年 71卷 830-834页

作者： Hong, Y. Hu, H.Y. Sakoda, A. Sagehashi, M. College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Environmental Simulation and Pollution Control State Key Joint Laboratory Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Institute of Industrial Science University of Tokyo Tokyo 1068558 Japan Institute of Industrial Science University of Tokyo Tokyo 1068558 Japan

Toxic and bloom-forming cyanobacterium Microcystis aeruginosa was exposed to antialgal allelochemical gramine (0, 0.5, 1, 2, 4, 8 mg·L-1), The effects of gramine on photosynthetic pigments (lipid soluble: chlorophyll a and β-carotene;water soluble: phycocyanin, allophycocyanin, phycoerythrin, and total phycobilins) and absorption spectra were studied in order to identify the most sensitive pigment probe implicating the crucial suppression site on photosynthetic apparatus. The results obtained indicated that all pigment parameters were decreased with gramine concentration increasing and exposure time extending. The above serious bleaching of pigments was also reflected on the scanning results of absorption spectra. Phycoerytherin exhibited the highest sensitivity to gramine added, following by the largest relative decrease. It was concluded that gramine seriously influenced algal photosynthetic activity by destroying photosynthetic pigments and phycoerythrin most sensitive to gramine might be contributed to its placing the outside of phycobilins.

关键词： Water absorption

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Effects of allelochemical gramine on metabolic activity and ultrastructure of cyanobacterium microcystis aeruginosa

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World Academy of science, engineering and technology 2010年 71卷 825-829页

In this study, inhibition of Microcystis aeruginosa by antialgal alleochemical gramine, was studied by analyzing algal metabolic activity (represented by esterase and total dehydrogenase activities) and cell ultrastructure (showing morphological and ultrastructure alterations using transmission electron microscopy and DNA ladder analysis). After gramine exposure, esterase and total dehydrogenase activities were increased firstly but decreased later. In contrast with the controls, the cells exposed to gramine showed apparent ultrastructure alterations with thylakoids in breakage, phycobilins in decrease, lipid and cyanophycin granules abundant firstly but dissolved afterwards, DNA in fragementation. The occurrence of increase of metabolic activity and specific granules reflected that the resistance of cellular response to gramine was initiated. DNA fragementation associated with the increase of metabolic activity and specific granules hinted that gramine caused M. aeruginosa cells to initiate some morphotype of programmed cell death.

关键词： Enzymes

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Effects of allelochemical gramine on metabolic activity and ultrastructure of cyanobacterium Microcystis aeruginosa

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World Academy of science, engineering and technology 2010年 47卷 826-830页

关键词： Enzymes

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Effects of allelochemical gramine on photosynthetic pigments of cyanobacterium Microcystis aeruginosa

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World Academy of science, engineering and technology 2010年 47卷 831-835页

关键词： Water absorption

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Multi-Channel Assignment in Wireless Sensor Networks: A Game Theoretic Approach

Multi-Channel Assignment in Wireless Sensor Networks: A Game...

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2010 Proceedings IEEE INFOCOM

作者： Qing Yu Jiming Chen Yanfei Fan Xuemin (Sherman) Shen Youxian Sun State Key Lab of Industrial Control Technology Zhejiang University Hangzhou 310027 P.R.China Department of Electrical and Computer Engineering University of Waterloo Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9781424458363

In this paper, we formulate multi-channel assignment in Wireless Sensor Networks (WSNs) as an optimization problem and show it is NP-hard. We then propose a distributed Game Based Channel Assignment algorithm (GBCA) to solve the problem. GBCA takes into account both the network topology information and transmission routing information. We prove that there exists at least one Nash Equilibrium in the channel assignment game. Furthermore, we analyze the sub-optimality of Nash Equilibrium and the convergence of the Best Response in the game. Simulation results are given to demonstrate that GBCA can reduce interference significantly and achieve satisfactory network performance in terms of delivery ratio, throughput, channel access delay and energy consumption.

关键词： Wireless sensor networks Game theory Routing Interference Protocols Network topology Nash equilibrium Radio transceivers Autonomous agents Sensor phenomena and characterization

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Research on performance robustness of PID control for TITO process with time delays

Research on performance robustness of PID control for TITO p...

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The 8th World Congress on Intelligent control and Automation(第八届智能控制与自动化世界大会 WCICA 2010)

作者： Zengrong Hu Jing Wang Donghai Li Weiqi Li Metallurgical Engineering Research institute　University of Science & Technology Beijing China　Scho Metallurgical Engineering Research institute University of Science & Technology Beijing China State Key Lab of Power Systems Dept of Thermal　Engineering Tsinghua University Beijing China Department of automatic control，School of Automation Beijing Institute of Technology，Beijing ，China

PID controller has simple structure and easy applicability with strong performance robustness. Decentralized PID controller and decoupling PID controller are widely adopted in the control of two-input-two-output (TITO) processes. Firstly, a simple decoupling controller matrix and a desired dynamic decoupling controller matrix are designed according to the idea of coupling matrix. And then three schemes of controller including decentralized PID controller, simple PID decoupling controller and desired dynamic PID decoupling controller are provided based on the excellent characteristic of DDE. Lastly, the Monte-Carlo stochastic experiment is introduced to analyze performance robustness of the controllers. The simulation experiments illustrate that the simple decoupling control scheme has the ability of complete decoupling and better performance robustness.

关键词： Robustness Mathematical model Distributed control Equations Delay effects Process control

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The study of mediator-less microbial fuel cell based on saccharomyces cerevisiae

The study of mediator-less microbial fuel cell based on sacc...

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IEEE/ASME International Conference on Mechtronic and Embedded Systems and Applications, MESA

作者： Yisheng Liu Wei Li Xudong Hu Yun Yin Faculty of Mechanical Engineering & Automation Zhejiang Science and Technology University Hangzhou China State Key Laboratory of Fluid Power Transmission and Control University of Zhejiang Hangzhou China Department of Food Science and Nutrition University of Zhejiang Hangzhou China

To enhance power output and reduce cost for practical application of microbial fuel cell (MFC), extensive experiments have done to study performance optimization of lab-made mediator-less MFC. Saccharomyces cerevisiae was first tamed to investigate electrical adaptability as electricigens during device operation. By analyzing open circuit voltage using anodes with different materials, iron anode was proved to be the most suitable material for its highly electrochemical activity and bargain price. The results of experiment also proved that the performance of MFC could be reinforced through increasing roughness of anodes. Furthermore, electrical adaptability of electricigens would be enhanced after taming was confirmed.

关键词： Anodes Platinum Cathodes

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Periodic disturbance rejection method using iterative learning predictive function control

Periodic disturbance rejection method using iterative learni...

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

作者： Wang, Jing Zhao, Jun Xu, Zuhua Qian, Jixin State Key Lab of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou China

ISBN: (纸本)9780769537351

In this paper, a robust control method is proposed for rejecting the periodic disturbance. Cooperating with predictive function control (PFC), iterative learning (IL) is used to deal with the period mismatch, that is, iterative learning control (ILC) is used to handle the periodic errors while PFC doing its job of system process control. Simulation results shows that the IL-PFC algorithm achieves significant improvement in rejecting periodic disturbance over the repetitive control scheme. © 2009 IEEE.

关键词： Iterative methods

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Active leader tracking control of multi-agent systems with quantized measurements

Active leader tracking control of multi-agent systems with q...

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Chinese control Conference (CCC)

作者： Jiangping Hu Yiguang Hong Gang Feng School of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China Key Lab of Systems and Control Institute of Systems Science Chinese Academy of Sciences Beijing 100190 China Department of MEEM City University of Hong Kong Kowloon Hong Kong

This paper discusses tracking control problem with a discrete-time multi-agent system with active leader and quantized communication constraints. For the active leader in a general linear form, we give a distributed design for each discrete-time agent in the leader tracking control problem and analyze the tracking convergence with the help of Riccati equation and common Lyapunov function when the communication channel is perfect. Then a stochastic quantization strategy is applied to model the information transmission in the agent coordination and the corresponding solution is also given, even if the interconnection topology is switching.

关键词： Lead Multiagent systems Symmetric matrices Convergence Stochastic processes Switches Topology

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