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第十五届全国等离子体科学技术会议

作者： Guodong Wang Minghai Liu Xiwei Hu Xiaoqin Song State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and TechnologyHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physics Huazhong University of Science and TechnologyWuhan 430074People''s Republic of China School of physicsHuazhong University of Science and TechnologyWuhan 430074People''s Republic of China

The absorbing property of a three—dimensional metamaterial operating at 12.7GHz is investigated numerically by the model of double C-shaped metallic stripes,which are printed on the each side of a dielectric cube *** carefully adjusting the dimensions of the metamaterial structure,the metamaterial simultaneously has both negative electric and magnetic response to an incident electromagnetic(EM)wave,and can exhibit left—handed property in a frequency rang with negative permittivity and permeability ***,Full-wave EM simulation demonstrates that it carl achieve over 99.6%absorption at 1 2.7GHz with a 0.4GHz full width at half *** metamaterial structures are scalable to operate a significant portion of the EM spectrum spanning from radio to the near optical *** metamaterial can ease design and fabrication,especially at high *** proposed absorber possesses many potential applications such as bolometer,sub—wavelength imaging,and microwave absorption.

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Soft X-ray Pulse Height Analysis System on J-TEXT Tokamak

Soft X-ray Pulse Height Analysis System on J-TEXT Tokamak

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第十五届全国等离子体科学技术会议

作者：金伟庄革丁永华张扬张静陈忠勇林士耀许平孔伟 State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT College of Electric and Electronic EngineeringHuazhong University of Science and Technology Institute of Plasma Physics Chinese Academy of Science Department of Modern Physics University of Science and Technology of China

A soft X-ray pulse height analysis(PHA) system has been designed and installed on J-TEXT tokamak for the study of electron temperature and *** system contains three Silicon Drift Detectors(SDD),a multi-channel analyzer(MCA), vacuum chamber,data collection procedure and off-line data processing program.A 60ms temporal resolution of electron temperature and the line radiation from moderate and high Z metallic impurities can be obtained by PHA *** on this system the performances of electron temperature and impurity have been investigated in J-TEXT ohmic heated plasmas.

关键词： soft-x-ray PHA J-TEXT

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Slot-array antenna devising for surface microwave discharge of surface plasmon polaritons

Slot-array antenna devising for surface microwave discharge ...

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Cross Strait Quad-Regional Radio Science and Wireless technology Conference (CSQRWC)

作者： Zhaoquan Chen Lingli Yelin Hu Xiaoliang Zheng An Yang Ping Li Longji Zhu Minghai Liu Lili Cheng Qiyan Zhou Xiwei Hu College of Electrical & Information Engineering Anhui University of Science and Technology Huainan Anhui China College of Electrical & Information Engineering Anhui University of Science and Technology Huainan China 232001 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

The production of surface microwave discharge is verified as a stable discharge excited by surface electromagnetic waves which is carried by surface plasmon polaritons. In order to achieve the purpose of coupling microwave energy efficiently and surface-wave discharge stably, in addition based on the dipole near-field radiation theory, we design the subwavelength diffraction grating. Moreover, the near-field radiation electric field distribution is studied by special proposed computation method and further the aim of design is achieved.

关键词： Surface waves Antennas

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Soft X-ray Pulse Height Analysis System on J-TEXT Tokamak

Soft X-ray Pulse Height Analysis System on J-TEXT Tokamak

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第十五届全国等离子体科学技术会议

作者： W.Jin G.Zhuang Y.H.Ding Y.Zhang J.Zhang Z.Y.Chen S.Y.Lin P.Xu W.Kong State Key Laboratory of Advanced Electromagnetic Engineering and Technology CHINA-USA Joint Fusion Laboratory J-TEXT. College of Electric and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China Institute of Plasma Physics Chinese Academy of Science. Hefei 230031China Department of Modern Physics University of Science and Technology of China Hefei 230026China

A soft X-ray pulse height analysis (PHA) system has been designed and installed on J-TEXT tokamak for the study of electron temperature and *** system contains three Silicon Drift Detectors (SDD),a multi-channel analyzer (MCA),vacuum chamber,data collection procedure and off-line data processing program.A 60ms temporal resolution of electron temperature and the line radiation from moderate and high Z metallic impurities can be obtained by PHA *** on this SyStcm the performances of electron temperature and impurity have been investigated in J-TEXT ohmic heated plasmas.

关键词： soft-x-ray PHA J-TEXT

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Study on Voltage Maintaining Performance of Metalized Film Capacitors under High Electric Fields

Study on Voltage Maintaining Performance of Metalized Film C...

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Annual Report Conference on Electrical Insulation and Dielectric Phenomena

作者： Hua Li Yaohong Chen Fuchang Lin Fei Lv Zhiwei Li Miao Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei P. R. China 430074

ISBN: (纸本)9781457709852

The metalized film capacitor can work under a high electric field due to its self-healing characteristic. But when the capacitor is charged rapidly to a specified high voltage (under a high electric field) and then it is disconnected from the power supply, a significant voltage drop will be observed, so the capacitor energy efficiency will reduce. It can be observed that the general curve of the voltage decay has a rapid initial drop and then the curve can usually be fit to a pure exponential. Firstly, this paper analyses the factors which cause the voltage decay through experimental study. The research results show that electric field strength, operating temperature and hold time play important roles in the voltage decay process. The higher the electric field or operating temperature is, the more significant the voltage drop is. If the voltage of the capacitor is maintained for a specified period of time, the voltage drop will reduce significantly. Through these experimental results, it is revealed that the voltage drop is mainly related to leakage and polarization. So the insulation resistance at various temperatures under high electric field is tested by the special technique. The results of insulation resistances are consistent with the voltage decay at various temperatures. Moreover, the interfacial polarization which exists in the charging process of metalized film capacitor is discussed. The interfacial polarization causes the rapid initial voltage decay.

关键词： Metalized Capacitors Maintaining

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适用于海上风场并网的混合多端直流输电技术研究

适用于海上风场并网的混合多端直流输电技术研究

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2012年中国智能电网学术研讨会

作者： WEN Jin-yu 文劲宇 CHEN Xia 陈霞 YAO Mei-qi 姚美齐 LI Nai-hu 李乃湖 SUN Shu-min 孙树敏 LI Guang-lei 李广磊 State Key Laboratory of Advanced Electromagnetic Engineering and Technology(AEET) (School ot Electri 强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院) 湖北武汉430074 ALSTOM Grid Technology Center(China)Co. LtdShanghai 201114China 阿尔斯通电网技术中心(中国)有限公司上海201114 Shandong Electric Power Research Institute Jinan 250002China 山东电力集团公司电力科学研究院山东济南250002

针对海上风电并网的需求,提出了采用VSC换流器连接海上风场和弱受端交流系统,LCC换流器连接较强交流系统的混合多端直流输电系统拓扑结构,并对一个混合5端直流输电系统进行了详细研究。分析了5个换流器的电压电流控制特性,设计了直流系... 详细信息

针对海上风电并网的需求,提出了采用VSC换流器连接海上风场和弱受端交流系统,LCC换流器连接较强交流系统的混合多端直流输电系统拓扑结构,并对一个混合5端直流输电系统进行了详细研究。分析了5个换流器的电压电流控制特性,设计了直流系统控制策略,研究了系统在风速波动、逆变侧VSC和LCC分别出现三相短路故障以及直流线路故障时系统的动态响应特性。仿真结果表明所提出的混合多端直流输电系统具有较好的运行特性,可以适应海上风电并网的需求。

关键词：海上风电并网混合多端直流输电技术换流器仿真分析

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Femtosecond pulse cleaning and measurement using self-diffraction process

Femtosecond pulse cleaning and measurement using self-diffra...

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2011 International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011

作者： Liu, Jun Kobayashi, Takayoshi Advanced Ultrafast Laser Research Center University of Electro-Communications Chofugaoka 1-5-1 Chofu Tokyo 182-8585 Japan State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Department of Electrophysics National Chiao Tung University 1001 Ta Hsueh Rd. Hsinchu 300 Taiwan Institute of Laser Engineering Osaka University Yamadakami 2-6 Suita 565-0871 Ibaraki 567-0047 Japan

The self-diffraction effect was used to improve temporal contrast of femtosecond pulse by about four-order of magnitudes. This self-diffraction effect was also used to measure a 55fs pulse based on the self-referenced... 详细信息

ISBN: (纸本)9780977565771

关键词： Diffraction

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10-fs deep-ultraviolet pulses without second- and third-order dispersions

10-fs deep-ultraviolet pulses without second- and third-orde...

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作者： Kida, Yuichiro Liu, Jun Kobayashi, Takayoshi Advanced Ultrafast Laser Research Center Department of Engineering Science University of Electro-Communications 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan Japan Science and Technology Agency 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China Department of Electrophysics National Chiao Tung University 1001 Ta Hsueh Rd. Hsinchu 300 Taiwan Institute of Laser Engineering Osaka University 2-6 Yamada-oka Suita Osaka 565-0971 Japan

10-fs deep-ultraviolet pulses are generated by broadband four-wave mixing and with a pulse compressor consisting of prisms and gratings. Pulse distortion in an ultrafast spectroscopic setup can be compensated by the c...

ISBN: (纸本)9781557529107

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Template-free hydrothermal fabrication of hierarchically organized γ-AlOOH hollow microspheres

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Microporous and Mesoporous Materials 2009年第1-3期122卷 42-47页

作者： Weiquan Cai Jiaguo Yu Stephen Mann State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Chemical Engineering Wuhan University of Technology Luoshi Road 122# Wuhan 430070 PR China Centre for Organized Matter Chemistry School of Chemistry University of Bristol Bristol BS8 1TS UK

Hierarchically organized γ-AlOOH hollow spheres with nanoflake-like porous surface textures were fabricated by chemically induced self-transformation of metastable solid particles of amorphous aluminium oxyhydroxide produced in situ within hydrothermal reaction mixtures containing aluminium sulfate and urea. Thermal treatment of the γ-AlOOH product at 600 °C produced intact hollow spheres of γ-Al 2 O 3 . Formation of the hollow γ-AlOOH structures was strongly dependent on the reaction temperature and time, as well as the concentration and molar ratio of the reactants. Hollow γ-AlOOH spheres were not obtained using mixtures of urea and aluminium nitrate or aluminium chloride, as metastable precursor particles were not produced under these conditions. In general, the described method is efficient and environmentally benign, and has significant advantages over traditional template approaches to the large-scale production of hollow inorganic materials. The prepared hierarchically organized γ-AlOOH and γ-Al 2 O 3 hollow spheres should have important applications in areas of catalysis, separation science, biomedical engineering and nanotechnology.

关键词： γ-AlOOH Hollow Microspheres Hierarchically Chemically induced self-transformation approach

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Numerical study of multi-longitudinal-mode dynamics of semiconductor ring lasers subject to ultra-short optical pulse injection

Numerical study of multi-longitudinal-mode dynamics of semic...

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Optoelectronic Materials and Devices III

作者： Lu, Dan Born, Chris Jian, Shuisheng Yu, SiYuan State Key Laboratory of All Optical Network and Advanced Telecommunication Network Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China Dept. of Electronic and Electrical Engineering University of Bristol Bristol BS8 1UB United Kingdom

A novel multi-mode model suitable for semiconductor ring lasers with ultra short optical pulse injection including all nonlinear coupling components is established and used to explore multilongitudinal-mode dynamics. ... 详细信息

关键词： Dynamics

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