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Theoretical investigation of a terahertz transmission line in bipolar coordinate system

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science china(Information sciences) 2012年第1期55卷 35-42页

作者： ZHONG RenBin,ZHOU Jun,LIU WeiHao&LIU ShengGang terahertz S&T research center,{3. of Electronic science and Technology of china,chengdu 610054,china 1. terahertz S&T research center University of Electronic Science and Technology of China Chengdu 610054 China

It has been demonstrated that the dual-wire waveguide(DWW)can be used in terahertz(THz) frequency regime with many ***,the existent research approaches for the DWW are based on the electrostatic *** this paper,making use of the bipolar coordinate system(BCS),a rigorous analytical theory of DWW is worked out,and some important physical and optical characters of DWW including the rotating behavior *** revealed,the equivalent impendence and the ohmic loss for the gold DWW are *** eigenvalue problem is presented from the point of view of Mathematical-Physics for TE and TM *** obtained results will help get a deep-going understanding of DWW and explore its application in high frequency range including THz.

关键词： dual-wire waveguide terahertz bipolar coordinate system

Tunable terahertz radiation from arbitrary profile dielectric grating coated with graphene excited by an electron beam

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Chinese Physics B 2015年第9期24卷 208-214页

作者：赵陶钟任斌胡旻陈晓行张平龚森刘盛纲 terahertz research center School of Physical ElectronicsUniversity of Electronic Science and Technology of China Cooperative Innovation Centre of terahertz science

In this paper, the enhanced terahertz radiation transformed from surface plasmon polaritons, excited by a uniformly moving electron bunch, in a structure consisting of a monolayer graphene supported on a dielectric grating with arbitrary profile is investigated. The results show that the grating profile has significant influence on the dispersion curves and radiation characteristics including radiation frequency and intensity. The dependence of dispersion and radiation characteristics on the grating shape for both the symmetric and asymmetric gratings is studied in detail. Moreover, we find that, for an asymmetric grating with certain profile, there exist two different diffraction types, and one of the two types can provide higher radiation intensity comparing to the other one. These results will definitely facilitate the practical application in developing a room-temperature, tunable, coherent and miniature terahertz radiation source.

关键词： terahertz radiation graphene surface plasmon polaritons arbitrary profile grating electron beam

The influence of impurity on the critical thickness of the CeO_2 buffer layer for coated conductors

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 993-996页

作者： PAN Min1, HUANG Zheng2, MA HuanFeng2, QIANG WeiRong2, WEI LianFu1, WANG Long2 & ZHAO Yong1,3.1 Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of china), Superconductivity R&D center (SRDC), Southwest Jiaotong university, {3. 61003., china 2 School of physical science and Technology, Southwest Jiaotong university, {3. 61003., china 3.Superconductivity research Group, School of Materials science and Engineering, university of New South Wale, Sydney, 2052 NSW, Australia Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of china) Superconductivity R&D Center (SRDC) Southwest Jiaotong University Chengdu 610031 China School of physical science and Technology Southwest Jiaotong University Chengdu 610031 China Superconductivity research Group School of Materials Science and Engineering University of New South Wale Sydney 2052 NSW Australia

The lattice parameters, band structure, density of state and elastic constant of RE-doped CeO2 (RE=Sm, Gd, Dy), the buffer material for coated HTS conductors, are calculated using the plane-wave method with pseudopotentials based on the density functional theory (DFT) of first-principle. The rule and mechanism of the effect of rare earth impurity on the critical thickness of the CeO2 buffer layer are investigated. It is found that, in the range of the calculation, the changes of the lattice volume V and elastic constant E of CeO2 with the impurity are mainly determined by the increased electrons ne of the system. The relationship of the elastic constant E and increased electrons ne is established. It is indicated that the critical thickness of the CeO2 single buffer layer doped with Sm, Gd, and Dy may be enhanced by 22%, 43. and 3.%, respectively.

关键词： CeO2 first principle critical thickness elastic constants

research on the multi-level intake water temperature effect of the Yalong River Jinping-I hydropower project

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science china(Technological sciences) 2011年第S1期54卷 125-132页

作者： WU ShiYong 1,CAO Wei 1,WANG HongMei 1,SUN ShuangKe 2 &CHEN QiuWen 3.1 Ertan Hydropower Development Company,Ltd.,chengdu 610051,china 2 china Institute of Water Resources and Hydropower {3.,Beijing 10003.,china 3.{3. center for Eco-Environmental sciences,Chinese Academy of sciences,Beijing 100085,china 1. Ertan Hydropower Development Company Ltd. Chengdu 610051 China2. China Institute of Water Resources and Hydropower Research Beijing 100038 China3. Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Based on the discussion of the multi-level intake application status of high dam reservoir,this paper takes the Jinping-I hydropower project reservoir in the Yalong River as an example,which is shaped by the highest 3.5 m high arch dam,and carries out the forecasting research on the reservoir temperature by numerical simulation and physical model *** paper studies the intake effect of withdrawing the surface warm water by the stoplog gates inlets and verifies the reliability of the mathematical model by comparative *** results show that for a high dam hydropower station,taking the appropriate multi-level intake measure can withdraw the surface warm water in the spawning season and provide a favorable environment for the fish *** technical ideas and implementation scheme are adopted in this *** can provide technical reference for the solutions of similar problems in the future and it also has important engineering significance on the research of water temperature in large deep reservoirs.

关键词： water temperature multi-level intake Jinping-I hydropower project

Design of a re-entrant double-staggered ladder circuit for V-band coupled-cavity traveling-wave tubes

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Chinese Physics B 2012年第7期21卷 291-297页

作者：刘洋徐进赖剑强许雄沈飞魏彦玉黄民智唐涛宫玉彬 National Key Laboratory of science and Technology on Vacuum electronics School of Physical ElectronicsUniversity of Electronic Science and Technology of China

The re-entrant double-staggered ladder slow-wave structure is employed in a high-power V-band coupled-cavity traveling-wave tube. This structure has a wide bandwidth, a moderate interaction impedance, and excellent thermal dissipation properties, as well as easy fabrication. A well-matched waveguide coupler is proposed for the structure. Combining the design of attenuators, a full-scale three-dimensional circuit model for the V-band coupled-cavity traveling- wave tube is constructed. The electromagnetic characteristics and the beam wave interaction of this structure are investigated. The beam current is set to be 100 mA, and the cathode voltage is tuned from 16.8 kV to 15.8 kV. The calculation results show that this tube can produce a saturated average output power over 100 W with an instantaneous bandwidth greater than 1.25 GHz in the frequency ranging from 58 GHz to 62 GHz. The corresponding gain and electronic efficiency can reach over 3. dB and 6.5%, respectively.

关键词： coupled-cavity traveling-wave tube V band re-entrant double-staggered ladder slow-wave structure

Discharge characteristics of protective LaB6 thin films in an AC plasma display panel

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science Bulletin 2012年第20期 2557-2560页

作者： WANG XiaoJu 1,DENG Jiang 2,LIU ZengYi 1,LIN ZuLun 1,QI KangCheng 1 & CAO GuiChuan 1 1 School of Opto-electronic Information,university of Electronic science and Technology of china,{3.,china 2 School of physical electronics,university of Electronic science and Technology of china,{3.,china

Lanthanum hexaboride (LaB 6) thin films were used as protective layers in alternating current plasma display panels (AC-PDPs).The firing voltages and discharge delay time of protective LaB 6 thin films were evaluated and compared with the conventional protective MgO layers in planar-type test panels filled with 5%-15% *** employing LaB 6 thin films as protective layers,both the firing voltages and discharge delay time decreased *** in the discharge properties of the LaB 6 thin film could be attributed to the lower work function,offering more priming electrons during the discharge process.

关键词： lanthanum hexaboride (LaB 6) protective layer firing voltages discharge delay time

Theoretical Proof of Unconditional Stability of the 3.D ADI-FDTD Method

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Journal of Electronic science and Technology of china 2003年第1期1卷 1-5页

作者： WANG Yingjun WANG Bingzhong SHAO Wei (School of physical electronics,UESTC chengdu 610054 {3.) School of physical electronics UESTC Chengdu 610054 China

In order to eliminate Courant-Friedrich-Levy(CFL) condition restraint and improvecomputational efficiency,a new finite-difference time-domain(FDTD)method based on the alternating-direction implicit(ADI) technique is introduced *** this paper,a theoretical proof of the stabilityof the three-dimensional(3.D)ADI-FDTD method is *** is shown that the 3.D ADI-FDTDmethod is unconditionally stable and free from the CFL condition restraint.

关键词： alternating-direction implicit(ADI)technique Courant-Friedrich-Levy(CFL)condition restraint finite-difference time-domain(FDTD)method stability

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加强重点基地建设繁荣社会科学研究

成都体育学院学报 2002年第2期28卷 1-4页

作者： Sports Social science research center ({3. Institute of physical Education Sichuan 610041) 成都体育学院体育社会科学研究中心成都体育学院四川成都610041

为实现我院体育社会科学研究发展目标 ,推动我国体育社会科学研究向纵深发展 ,对我院体育社会科学研究的基本情况、三个重点研究方向、“十五”

关键词：体育社会科学基本情况重点研究方向主要举措

Teaching and Learning Reform of Visual Foxpro Programming

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Teaching and Learning Reform of Visual Foxpro Programming