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Metamaterial absorbers realized in an X-band rectangular waveguide

Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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Structure and property of metal melt Ⅳ——Evolution of titanium melt residual bond structure and its effect on dynamic viscosity

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science China(Physics,Mechanics & Astronomy) 2012年第8期55卷 1371-1375页

作者： MI GuangBao CAO JingXia HUANG Xu CAO ChunXiao LIPeiJie HE LiangJu Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys Beijing Institute of Aeronautical Materials Beijing 100095 China National Center afNovel Materials for International Research Tsinghua University Beijing 100084 China

Based on the concept of melt residual bonds, a calculating model quantitatively describing the evolution of the residual bond structure of titanium melt at the melting point or in a certain range above the melting point was established; i.e., both the size ds and the bond number n of the residual bond structure decrease monotonously with the increase of temperature. By mathe- matical deduction, a linear relationship between the residual bond structure size ds and the dynamic viscosity 17 of Titanium melt was revealed, i.e., η= 0.876 ＋ 0.471·ds, which is of great significance to the investigation of the relationship between the melt microstructure and the macroscopic properties of metals with high melting temperature.

关键词： titanium melt residual bond structure dynamic viscosity calculating model

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A medical image fusion method based on visual models 1

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9th International Symposium on Neural Networks, ISNN 2012

作者： Qu, Jingyi Jia, Yunfei Du, Ying Tianjin Key Laboratory for Advanced Signal Processing Civil Aviation University Tianjin 300300 China School of Science East China University of Science and Technology Shanghai 200237 China

ISBN: (数字)9783642313622

ISBN: (纸本)9783642313615

A new method of medical image fusion is proposed in this paper, which is based on human visual models and IHS color space. Retina-inspired difference of Gaussian model is adopted to enhance the spatial information of anatomical images. Also, 2D Log-Gabor model of primary visual cortex is used to enhance the spectrum information of functional images. The statistical analyses tools such as average gradient and entropy are demonstrated that the proposed algorithm does considerably increase spatial information content and reduce the color distortion compared to the counterpart fusion methods. In the proposed fused images the color information is least distorted, the spatial details are as clear as the original anatomical images, and the integration of color and spatial features was normal. © 2012 Springer-Verlag.

关键词： Image fusion

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A hybrid optimization algorithm for the multi-chromosomal reversal median problem

A hybrid optimization algorithm for the multi-chromosomal re...

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1st International Conference on Engineering and technology Innovation, ICETI 2011

作者： Zhang, Yi Zhang, Meng Department of Computer Science Jilin Business and Technology College Changchun 130062 China Military Simulation Technology Institute Air Force Aviation University Changchun130022 China Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Changchun 130012 China

ISBN: (纸本)9783037853245

In this paper, we introduce a hybrid optimization algorithm with the Branch-and-Bound Method and the Ant Colony Optimization to solve the multi-chromosomal reversal median problem. We convert the large-scale genome into TSP maps at first. Then we use a hybrid optimization algorithm with the Branch-and-Bound Method and the Ant Colony Optimization to solve the problem. In our improved algorithm, we increase the search speed by implement multi-branch parallel search of ACO. Our extensive experiments on simulated datasets show that this median solver is efficient.

关键词： Ant colony optimization

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Sulfidation of a Novel Iron Sorbent Supported on Lignite Chars during Hot Coal Gas Desulfurization

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Physics Procedia 2012年 24卷 290-296页

作者： Fengkui Yin Jianglong Yu Sushil Gupta Shaoyan Wang Dongmei Wang Li Yang Arash Tahmasebi Key Laboratory of Liaoning Province for Advanced Coking Technology School of Chemical Engineering University of Science and Technology Liaoning Anshan (114051) China Key Laboratory of Coal-Based Fuels for Aviation and Thermal Energy Research Centre Shenyang Aerospace University Shenyang (110136) China SMART@UNSW School of Materials Science & Engineering UNSW Sydney NSW 2052 Australia

The sulfidation behavior of novel iron oxide sorbents supported using activated-chars during desulfurization of hot coal gases has been studied. The sulfidation of the char-supported sorbents was investigated using a fixed-bed quartz reactor in the temperature range of 673K to 873K. The product gases were analyzed using a GC equipped with a TCD and a FPD detector. The sorbent samples before and after sulfidation were examined using SEM and XRD.

关键词： Hot coal gas desulfurization char-supported Fe sorbents sulfidation IGCC poly-generation

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The structural stabilities and electronic properties of orthorhombic and rhombohedral LaGaO3: a first-principles study

The structural stabilities and electronic properties of orth...

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UK-China Symposium of New Energy Materials and Nanotechnology(2012年中英纳米技术和新能源材料研讨会)

作者： Q.G.Song Q.G.Du L.L.Song H.Zhao Y.R.Guo Institute of Low Dimensional Materials and Technology College of Science Civil Aviation University of China Tianjin 300300 China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology Institute of Advanced Materials Physics Faculty of Science Tianjin University Tianjin 300072China Institute of Low Dimensional Materials and Technology College of Science Civil Aviation University of China Tianjin 300300 China College of Science Hebei University of Technology Tianjin 300130 China

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Analysis on Characteristics of Fly Ash from Coal Fired Power Stations

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Energy Procedia 2012年 17卷 3-9页

作者： Jianglong Yu Xianchun Li David Fleming Zhaoquan Meng Dongmei Wang Arash Tahmasebi Key laboratory of Coal-Based Fuels for Aviation School of Power and Energy Engineering Shenyang Aerospace University Shenyang (110136) P.R. China Key Laboratory of Liaoning Province for Advanced Coking Technology School of Chemical Engineering University of Science and Technology Liaoning Anshan Liaoning (114051) China Newcastle Innovation Ltd Newcastle University Callaghan NSW 2308 Australiad Liaoning Fu-an Group Anshan Liaoning (114051) China

The paper studied the characteristics of fly ash samples from two power stations, focusing on cenospheres and superfine ash particles. Sieving tests and floatation tests were performed in the lab. Chemical composition, PSD, structure, morphology and cross-section structure of fly ash samples were analyzed using XRF, XRD, SEM, Laser Sizer.

关键词： Fly ash cenosphere morphology

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Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

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Research on fractional order controller based on best rational approximation approach

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Journal of Convergence Information technology 2012年第4期7卷 50-58页

作者： Zhao, Huimin Nie, Bing Li, Wen Deng, Wu Software Institute Dalian Jiaotong University Dalian 116028 China Key Laboratory of Numerical Simulation in the Sichuan Provincial College Neijiang Normal University Neijiang 641112 China Artificial Intelligence Key Laboratory of Sichuan Province Sichuan University of Science and Engineering Zigong 643000 China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University Chongqing 400044 China Key Laboratory of advanced Design and Intelligent Computing Dalian University Ministry of Education Dalian 116622 China

Introduce the basic concept of best rational approximation and constructing procedure of the best rational approximation function in Laplace domain. By an illustrative example the design method of FOC based on best rational approximation is discussed. The performance comparison of transfer functions between the FOC obtained by best rational approximation method and conventional PID shows that it is effective to apply the method in design of FOC, which can guarantee maximum absolute error of amplitude frequency characteristic of approximation function in a given error tolerance.

关键词： Rational functions

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Research on the estimation and reduction measures of antenna mode RCS of airborne phased array

Research on the estimation and reduction measures of antenna...

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2011 4th IEEE International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, MAPE 2011

作者： Liu, Yun You, Lizhi Aviation Key Laboratory of Science and Technology on Avionics Integrated Sensor System Simulation Radar and Avionics Institute of AVIC Wuxi China

ISBN: (纸本)9781424482665

In this paper, the scattering principium of airborne phased array antenna is discussed, and the antenna mode RCS of the two-dimensional array is estimated. Based on theoretical calculations, broadband matching, incline, manufacturing tolerances and other RCS reduction measures are researched. The results show that these stealth approaches have an obviously effect on the RCS reduction. © 2011 IEEE.

关键词： Antenna arrays Antenna radiation patterns Arrays Phased array RCS reduction measures Radar antennas Reflector antennas Scattering airborne phased array antenna airborne radar antenna mode RCS estimation antenna mode scattering antenna mode scattering antenna phased arrays broadband antennas broadband matching electromagnetic wave scattering manufacturing tolerances phased array radar radar cross-sections reduction two-dimensional array

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