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6th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2017

作者： Zhu, Qingcheng Li, Zhenbiao Zong, Tianyuan Wei, Jiang Huang, Jing Liu, Zixun Hasegawa, M. State Key Lab. of Advanced Electromagnetic Engineering and Technology Huazhong Univ. of Science and Technology Wuhan430074 China Chitose Institute of Science and Technology Chitose Hokkaido066-8655 Japan

ISBN: (纸本)9789881532398

Contact welding can occur in both making and breaking operations. In order to research contact welding phenomena in making operations, electrical endurance tests were conducted with a simulation test device. Welding phenomena at three different moments were studied to know which moment is the most critical for the welding phenomena: (i) at the first touch of movable and fixed contacts;(ii) at the contact bounce separation;and, (iii) when the movable and fixed contacts touch each other after the end of bounce. Influences of the number of bounces as well as bounce duration characteristics on the welding phenomena were also investigated.

关键词： Electric contacts

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Smart radio environments

arXiv

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arXiv 2021年

作者： Gradoni, Gabriele Renzo, Marco Di Díaz-Rubio, Ana Tretyakov, Sergei A. Caloz, Christophe Gradoni, Gabriele Peng, Zhen Alu, Andrea Lerosey, Geoffroy Fink, Mathias Galdi, Vincenzo Cui, Tie Jun Frazier, Benjamin W. Anlage, Steven M. Salucci, Marco Massa, Andrea Cheng, Qiang Wang, Jinghe Jin, Shi Dardari, Davide Decarli, Nicoló Yurduseven, Okan Matthaiou, Michail Kenney, Mitchell Gordon, George Georgiou, Orestis Nguyen, Cam Ly Martini, Enrica Maci, Stefano Wakatsuchi, Hiroki Phang, Sendy School of Mathematical Sciences Department of Electrical and Electronic Engineering University of Nottingham Nottingham United Kingdom Laboratoire des Signaux et Systémes CNRS CentraleSupélec Université Paris-Saclay Gif-sur-Yvette Paris France Department of of Electronics and Nanoengineering Aalto University Espoo Finland META Research Group KU Leuven Belgium School of Mathematical Sciences Department of Electrical and Electronic Engineering University of Nottingham University Park NG72RD United Kingdom Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign IL United States Advanced Science Research Center City University of New York United States Greenerwave 6 rue Jean Calvin Paris75005 France Institut Langevin 1 rue Jussieu Paris75005 France Fields & Waves Lab Department of Engineering University of Sannio Benevento Italy State Key Laboratory of Millimeter Waves Southeast University Nanjing China Applied Physics Laboratory Johns Hopkins University LaurelMD20723 United States Department of Electrical and Computer Engineering Department of Physics Quantum Materials Center University of Maryland College ParkMD20742 United States Trento Italy Chengdu China Beijing China Institute of Electromagnetic Space State Key Laboratory of Millimeter Waves Southeast University Nanjing210096 China National Mobile Communications Research Laboratory Southeast University Nanjing China University of Bologna Bologna Italy Bologna Italy Centre for Wireless Innovation Institute of Electronics Communications and Information Technology Queen’s University Belfast Belfast United Kingdom Department of Electrical and Electronic Engineering University of Nottingham Nottingham United Kingdom Department of Electrical and Computer Engineering University of Cyprus Nicosia Cyprus Wireless System Laboratory Corporate Research & Development Center Toshiba Corporation Kawasaki Japan Department of Information Engineering an

This Roadmap takes the reader on a journey through the research in electromagnetic wave propagation control via reconfigurable intelligent surfaces. Meta-surface modelling and design methods are reviewed along with physical realisation techniques. Several wireless applications are discussed, including beam-forming, focusing, imaging, localisation, and sensing, some rooted in novel architectures for future mobile communications networks towards 6G. © 2021, CC BY.

关键词： electromagnetic wave propagation

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Photonic topological valley-locked waveguides

arXiv

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arXiv 2020年

作者： Chen, Qiaolu Zhang, Li Yan, Qinghui Xi, Rui Chen, Hongsheng Yang, Yihao Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Zhejiang University Hangzhou310027 China International Joint Innovation Center ZJU-UIUC Institute Zhejiang University Haining314400 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore Centre for Disruptive Photonic Technologies Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

Topological valley kink states have become a significant research frontier with considerable intriguing applications such as robust on-chip communications and topological lasers. Unlike guided modes with adjustable widths in most conventional waveguides, the valley kink states are usually highly confined around the domain walls and thus lack the mode width degree of freedom (DOF), posing a serious limitation to potential device applications. Here, by adding a photonic crystal (PhC) featuring a Dirac point between two valley PhCs with opposite valley-Chern numbers, we design and experimentally demonstrate topological valley-locked waveguides (TVLWs) with tunable mode widths. The photoinc TVLWs could find unique applications, such as high-energy-capacity topological channel intersections, valley-locked energy concentrators, and topological cavities with designable confinement, as verified numerically and experimentally. The TVLWs with width DOF could be beneficial to interface with the exsisting photonic waveguides and devices, and serve as a novel platform for practical use of topological lasing, field enhancement, on-chip communicaitons, and high-capacity energy transport. Copyright © 2020, The Authors. All rights reserved.

关键词： Landforms

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Energy modelling for FDM 3D printing from a life cycle perspective

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International Journal of Manufacturing Research 2017年第1期12卷 83-98页

作者： Peng, Tao Sun, Wenjun State Key Lab. of Fluid Power Transmission and Control Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou310027 China Industrial Engineering Centre College of Mechanical Engineering Zhejiang University Hangzhou310027 China

Advances in 3D printing is penetrating in many industries. It is changing the way of doing manufacturing business and people's life. Performing energy and related environmental impact analysis of this technology is necessary and profound. In this paper, energy modelling is studied for FDM printing from a life cycle perspective. For a typical FDM life cycle, the stages covered are material production, printing, post-processing and related transportation. For each stage, energy consumption is modelled and measures for unit energy consumption are also proposed to assist quick calculation of a life cycle energy consumption. Besides, the machines used in different stages are analysed and the main energy consuming components are summarised. Based on a sample part, preliminary calculation of its life cycle energy consumption is presented, showing that life cycle energy saving is possible, particular with collective efforts from different stages. This offers additional data to select an energy-efficient manufacturing process. Copyright © 2017 Inderscience Enterprises Ltd.

关键词： Energy utilization

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Multi-temporal PolSAR crops classification using polarimetric-feature-driven deep convolutional neural network

Multi-temporal PolSAR crops classification using polarimetri...

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2017 International Workshop on Remote Sensing with Intelligent Processing, RSIP 2017

作者： Chen, Si-Wei Tao, Chen-Song State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Engineering National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781538619902

Multi-temporal PolSAR data is suitable for crops classification and growth monitoring. It is still difficult to establish a classifier with good robustness and high generation over a long temporal acquisition duration. This work aims to provide a solution to this task by exploring benefits from both the target scattering mechanism interpretation and the advanced deep learning. A polarimetric-feature-driven deep convolutional neural network classification scheme is established. Comparison studies with multi-temporal UAVSAR datasets validate the efficiency and superiority of the proposal. © 2017 IEEE.

关键词： Classification (of information)

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Experimental research on the characteristics of steam-water counter-current flow in the Pressurizer Surge Line assembly

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Experimental Thermal and Fluid Science 2018年 96卷 180-191页

作者： Jiangtao Yu Dalin Zhang Leitai Shi Zhiwei Wang Wenxi Tian G.H. Su S.Z. Qiu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China

To investigate Counter-Current Flow (CCF) characteristics in the Pressurizer Surge Line (PZR SL) assembly of the large advanced passive nuclear reactors, steam-water CCF experiments are carried out on a stainless steel test section, which is a 1:4 scaled-down model of the AP1000 PZR SL assembly. The inner diameter of the test PZR SL pipe is 90 mm, which also belongs to the large-diameter pipes, as same as the prototype PZR SL pipe, in the field of Counter-Current Flow Limitation (CCFL) researches. The present steam-water CCFL experiments are conducted under normal pressure and saturated temperature, with the PZR simulator collapse water level ranging from 350 to 900 mm. CCFL becomes severer at higher steam flow rate, and the most limiting CCFL effect locates between the PZR simulator bottom head and the vertical part of PZR SL pipe. The onset of CCFL and zero liquid penetration (ZP) are two critical conditions in the CCF development process, dividing the process into three stages: Before-CCFL, Partial-CCFL, and CCFL-ZP. According to the local CCFL conditions, the development of the CCFL process is also divided into four-regions since onset of CCFL. The present steam-water CCF data are well normalized in terms of dimensionless Kutateladze (Ku) numbers, and a Ku-type empirical partial CCFL correlation is developed. The comparisons of the present CCF data and partial CCFL correlation with the CCF data and correlations of former experiment researches validate that the present empirical partial CCFL correlation is conservative to predict steam-water partial CCFL in the prototype PZR SL assembly of the large advanced passive nuclear reactors.

关键词： Steam-water counter-current flow Partial CCFL correlation Pressurizer surge line assembly advanced passive nuclear reactors ADS Automatic Depressurization System ADS1-3 First to Third Stages of ADS ADS4 Fourth Stage of ADS CCF Counter-Current Flow CCFL Counter-Current Flow Limitation CCFL-1 The 1st grade of CCFL region CCFL-2 The 2nd grade of CCFL region CCFL-3 The 3rd grade of CCFL region CCFL-L Local CCFL at the T-junction of HL pipe and PZR SL pipe CCFL-S Local CCFL along the PZR SL pipe CCFL-U Local CCFL at the location between the PZR simulator bottom head and vertical part of PZR SL pipe CCFL-ZP Zero liquid penetration region or stage CMT Core Makeup Tank COCF Co-Current Flow HL Hot Leg IRWST In-containment Refueling Water Storage Tank Ku Kutateladze PRHR Passive Containment Cooling System PWRs Pressurized Water Reactors PZR SL Pressurizer Surge Line RC Reactor Core RCS Reactor Coolant System RPV Reactor Pressure Vessel SBLOCAs Small-Break Loss-of-Coolant Accidents ZP zero liquid penetration

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Analysis of deceptive moving target generated by single jammer in multi-channel SAR-GMTI

Analysis of deceptive moving target generated by single jamm...

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2017 International Applied Computational electromagnetics Society Symposium in China, ACES-China 2017

作者： Zhang, Jingke Dai, Dahai Qi, Zongfeng Zeng, Yonghu Xiao, Shunping State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System Henna471000 China College of Electronic Science and Engineering National University of Defense Technology Hunan410073 China

ISBN: (纸本)9780996007856

Based on three-channel SAR-GMTI system, the velocity and location of the deceptive moving target generated by single jammer are studied. Study result shows that both the deceptive stationary target and moving target can be considered as moving target, and the estimated azimuth location which has nothing to do with the setting value is the same as jammer. © 2017 Applied Computational electromagnetics Society.

关键词： Synthetic aperture radar

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Pulse compression of V-FM signals via dechirping 2017

Pulse compression of V-FM signals via dechirping

引用

9th International Conference on Signal Processing Systems, ICSPS 2017

作者： Xie, Xiaoxia Pan, Xiaoyi Gu, Zhaoyu College of Electronic Science and Engineering National University of Defense Technology Changsha410073 China State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information System National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781450353847

This paper focuses on the pulse compression of wideband V-style frequency modulation (V-FM) signals, where the pulse compression of the received V-FM signals is achieved by the dual-channel dechirping. The compressed signals of one channel after pulse compression is flipped left to right and added to the compressed signals of another channel after pulse compression to achieve the final signals of the V-FM signals after pulse compression. Simulated trials are conducted to demonstrate the effectiveness of the proposed algorithm in pulse compression of the V-FM signals. © 2017 Association for Computing Machinery.

关键词： Frequency modulation

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Inductance-Emulating Control for DFIG-Based Wind Turbine to Ride-Through Grid Faults

Inductance-Emulating Control for DFIG-Based Wind Turbine to ...

引用

作者： Zhu, Donghai Zou, Xudong Deng, Lu Huang, Qingjun Zhou, Shiying Kang, Yong StateKey Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Wuhan NARI Limited Liability Company of State Grid Electric Power Research Institute Wuhan430074 China State Key Lab. of Disaster Prev. and Reduction for Pwr. Grid Transmission and Distribution Equipment Changsha410129 China

For doubly fed induction generator (DFIG)-based wind turbines, the rotor side of DFIG is prone to suffering from overcurrent during grid faults, due to large electromotive force (EMF) induced in the rotor circuit. To solve this problem, this paper proposes an inductance-emulating control strategy for DFIG-based wind turbine to suppress the postfault rotor current, thereby enhancing its low-voltage ride through capability. Under the proposed control strategy, once the grid fault is detected, the rotor side converter (RSC) is controlled to emulate an inductance. Furthermore, with proper inductance value, both the required rotor voltage and postfault rotor current can be reduced within the permissible ranges of RSC, thus the controllab.lity of control system can be maintained during transient process. Moreover, the oscillation of electromagnetic torque can be effectively suppressed during transient state of both grid fault and fault recovery. Finally, the simulation and experimental results are presented to demonstrate the effectiveness of the proposed method. © 1986-2012 IEEE.

关键词： Wind turbines

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Design and Experimental Verification of DC-DC Autotransformer Prototype

Design and Experimental Verification of DC-DC Autotransforme...

引用

IEEE Power and Energy Society General Meeting

作者： Mengbo Li Meng Zhou Wenping Zuo Weixing Lin Jinyu Wen Cheng Luo State Key Lab of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Northern Indiana Public Service Company

ISBN: (纸本)9781538622131;9781538622124

It is a necessity to use DC-DC transformers when interconnecting two DC systems with different voltages levels. This article designs the prototype of bidirectional DC-DC autotransformer (DC AUTO) and voltage step-up unidirectional DC AUTO (UUDAT). The article firstly illustrates the electrical primary system in experimental prototype, then studies its control strategy and the corresponding control system framework. Finally, the article analyses the operating characteristics of the prototype. The experimental results manifest that the bidirectional DC-AUTO transformer and the UUDAT are all capable of transmitting DC power as required. Taking interconnecting two DC systems with voltage level of 375V and 750V as instance, the capacity of the converter using DC AUTO technology will only be 50% of the capacity using conventional DC/AC/DC technology. The theoretical deductions and the experimental results have all demonstrated that DC AUTO technology will not only ensure low building cost but also lead to low transmission loss.

关键词： Power conversion Prototypes HVDC transmission Voltage control Topology electromagnetics

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