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4th International Conference on Materials Science and Information technology, MSIT 2014

作者： Jiang, Jian Feng Jiang, Zhong He Sun, Xin Feng Guo, Wei Xin State Key laboratory of Advanced Electromagnetic Engineering and Technology 430074 Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351733

Wave heating is an important way to implement the controlled fusion. The propagation and absorbability of wave in the plasma are described by the two-fluid equations and Maxwell's equations. A numerical algorithm based on the FDTD method and the MacCormack scheme is designed. The numerical simulation based on parallel computing is carried out to verify the validity of the algorithm and simulation. © (2014) Trans Tech Publications, Switzerland.

关键词： Maxwell equations

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Simulation on superconducting magnetic energy storage in a grid-connected photovoltaic system

Simulation on superconducting magnetic energy storage in a g...

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2014 International Conference on Energy Research and Power engineering, ERPE 2014

作者： Xie, Yang Zhang, Ming Jiang, Guo Zhong Geng, Peng Yu, Ke Xun State Key laboratory of Advanced Electromagnetic Engineering and Technology 430074 Wuhan China School of Electrical and Electronic Engineering Huazhong University of science and Technology 430074 Wuhan China

ISBN: (纸本)9783038351603

Photovoltaic (PV) generation is widely used to solve energy shortage and environment problem. Since the output current of the solar cell will change with the sunlight irradiation, the power of the solar cells are not stable, so there is a need of a storage equipment connected to the PV system. With the characteristics of high efficient energy storage and quick response of the power exchange, the superconducting magnetic energy storage (SMES) can be used to meet the balance between the grid and the PV. A SMES and PV subsystem are connected together with the DC bus, which have less power electronics elements and can control power quality efficiently than linked with the AC bus. This hybrid system is composed of a DC/AC converter on the grid side, a DC/DC converter with the PV arrays, and a DC chopper with the superconducting magnet. A detailed model of the hybrid system is built with MATlab/SIMULINK. Simulation results with and without SMES connected to the grid-connected photovoltaic system are presented, compared, and analyzed. The results of simulation demonstrate that the SMES system can maintain the DC bus as a constant value which can contribute to the stability and reliability of the grid-connected PV system. © (2014) Trans Tech Publications, Switzerland.

关键词： Hybrid systems

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Design and test of the control system for the fast disruption mitigation valve on J-TEXT

Design and test of the control system for the fast disruptio...

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2014 International Conference on Energy Research and Power engineering, ERPE 2014

作者： Wang, Shen Yang Chen, Zhong Yong Luo, Yi Hui State Key Laboratory of Advanced Electromagnetic Engineering and Technology 430074 Wuhan China College of Electrical and Electronic Engineering Huazhong University of Science and Technology 430074 Wuhan China

ISBN: (纸本)9783038351603

Disruptions are highly undesired events during tokamak plasma discharge, and now massive gas injection (MGI) is the most promising technique mitigating all negative consequences of a disruption. A fast disruption mitigation valve has been designed and tested for J-TEXT tokamak based on eddy-current repulsion mechanism. In order to get the key operating parameters of the valve such as voltage and gas pressure in real time and to realize remote automatic control, a control system on labVIEW software platform based on hardwires of sensors, relays, Advantech industrial computer and NI-6221 data acquisition card has also been designed. The experimental test results show that the control system works well. © (2014) Trans Tech Publications, Switzerland.

关键词： Data acquisition

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Enhanced active control of metal transfer in GMAW

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2015年 363卷 517-524页

作者： Xiao, Jun Chen, Shu-Jun Zhang, Guang-Jun Zhang, Yu-Ming The Welding Research Institute Beijing University of Technology Beijing China The State Key Lab of Advanced Welding and Joining Harbin Institute of Technology Harbin China The Institute for Sustainable Manufacturing Department of Electrical and Computer Engineering University of Kentucky LexingtonKY United States

An optimized current waveform is proposed in this study to first excite enhanced droplet oscillation and then utilize it to enhance the droplet detachment. The excitation is intentionally generated by reducing the current from a peak level, referred to as the exciting peak, to the base level. Another peak level, referred to as the detaching peak, is then applied after a time interval called the detaching phase delay to synchronize the detaching action with the beneficial droplet momentum as a phase match such that the droplet detachment is enhanced by the beneficial momentum. The active metal transfer control utilizing the enhanced droplet oscillation, referred to as the enhanced active metal transfer control, is further systematically studied in this paper. Experimental research shows that the minimum detaching peak current in the enhanced active metal transfer control is not only remarkably lower than the spray transition current, but also significantly lower than that of the original active control process. © Springer International Publishing Switzerland 2015.

关键词： Metals

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Multi-task rank learning for image quality assessment 40

Multi-task rank learning for image quality assessment

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40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015

作者： Xu, Long Li, Jia Lin, Weisi Zhang, Yongbing Ma, Lin Fang, Yuming Zhang, Yun Yan, Yihua Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences Beijing China State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering BeihangUniversity Beijing China International Research Institute for Multidisciplinary Science Beihang University Beijing China Department of Computer Engineering Nanyang Technological University Singapore Graduate School at Shenzhen Tsinghua University Shenzhen China Huawei Noah's Ark Lab Hong Kong School of Information Technology Jiangxi University of Finance and Economics Nanchang China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China

ISBN: (纸本)9781467369978

In practice, multiple types of distortions are associated with an image quality degradation process. The existing machine learning (ML) based image quality assessment (IQA) approaches generally established a unified model for all distortion types, or each model is trained independently for each distortion type by using single-task learning, which lead to the poor generalization ability of the models as applied to practical image processing. There are often the underlying cross relatedness amongst these single-task learnings in IQA, which is ignored by the previous approaches. To solve this problem, we propose a multi-task learning framework to train IQA models simultaneously across individual tasks each of which concerns one distortion type. These relatedness can be therefore exploited to improve the generalization ability of IQA models from single-task learning. In addition, pairwise image quality rank instead of image quality rating is optimized in learning task. By mapping image quality rank to image quality rating, a novel no-reference (NR) IQA approach can be derived. The experimental results confirm that the proposed Multi-task Rank Learning based IQA (MRLIQ) approach is prominent among all state-of-the-art NR-IQA approaches. © 2015 IEEE.

关键词： image quality assessment machine learning MOS pairwise comparison Rank learning

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Design of high-gain amplifier for Soft X-ray imaging diagnostic system on J-TEXT tokamak

Design of high-gain amplifier for Soft X-ray imaging diagnos...

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2014 International Conference on Energy Research and Power engineering, ERPE 2014

作者： Xiao, Zheng Yu Zhang, Xiao Qing Ding, Yong Hua Li, Jian Chao State Key laboratory of Advanced Electromagnetic Engineering and Technology 430074 Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351603

Amplifier is a key component of the Soft X-ray imaging diagnostic system and the system is one of the most important diagnostic systems on J-TEXT tokamak. Signal generated by the photodiode is current and it's too small. A high-gain amplifier enable us to observe the soft x-ray radiation signal in J-TEXT tokamak accurately. So an amplifier based on transimpedance circuit was proposed. Through theoretical calculations and simulations, the designed amplifier can achieve the set goals that are the V/I gain of 106 and the bandwidth of 20KHz. In order to ensure the quality of the signal, interface and shell of the amplifier are designed specially. Finally designed amplifier works properly in the experiment and it can meet the needs of the experiment. © (2014) Trans Tech Publications, Switzerland.

关键词： Photodiodes

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Robust energy-efficient power loading for MIMO system under imperfect CSI

Robust energy-efficient power loading for MIMO system under ...

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作者： Rui, Yun Deng, Lei Wang, Qian Li, Jing Qian, Guoming Li, Mingqi Wang, Yingguan Shanghai Advanced Research Institute National Mobile Communications Research Laboratory Southeast University 201210 China Department of Information Engineering Chinese University of Hong Kong Hong Kong999077 Hong Kong School of Computer Science Wuhan University 430072 China State Key Laboratory of Integrated Service Networks Xidian University 710075 China College of Electronic Science and Engineering in NUPT 210003 China Shanghai Advanced Research Institute Chinese Academic of Science 201210 China Key Lab of Wireless Sensor Network and Communications Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 201210 China

In this paper, we will investigate the energy efficient power loading problem in multipleinput multiple-output singular value decomposition (MIMO-SVD) architecture. Most existing power loading schemes are developed on the assumption that a scheduler possesses perfect channel state information (CSI). However, in practice, perfect CSI is not always available. In this paper, we propose an energy-efficient power loading scheme for MIMO system under imperfect CSI, taking into account the effects of channel estimation error (CEE). Specifically, we propose two algorithms to maximise the system energy efficiency. One is a global method which can achieve the global optimal solution with high computational complexity;the other is a suboptimal method which can obtain the approximate optimal solution with lower computational complexity. Simulation results validate the effectiveness and robustness of our proposed power loading scheme. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： MIMO systems

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The study of grounding grid state parameter measuring system based on IPC platform

The study of grounding grid state parameter measuring system...

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2013 International Conference on Renewable Energy and Environmental technology, REET 2013

作者： Chen, Wei Zhang, Dan Dan Zhou, Wu Hu, Jian Ming Chongqing Electric Power Research Institute Chongqing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology HuaZhong University of Science and Technology Wuhan China

ISBN: (纸本)9783037859124

It is well known that state detecting and evaluating of grounding grid in substation especially defect diagnosis is highly necessary for power system. To detect and evaluate the state efficiently, relevant parameters should be obtained exactly as existing standards all put great emphasis on different parameters should be well-considered. This paper proposed a grounding grid parameter measuring system composed of three devices, through which grounding grid resistance, step voltage, contact voltage under alternating current, connection resistance under direct current and surface potential under square current are available, square current is present in this paper for defect diagnosis. IPC is utilized as the superior computer in this system together with digital touch screen that directly lead to larger storage capacity, simple operation and more friendly convenience for communication between human and computer compared with traditional SCM system. Through experiments it is proved to be accurate,reliable and repeatable, especially effective for square current devices in defect diagnosis. This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. © (2014) Trans Tech Publications, Switzerland.

关键词： Touch screens

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The utilization of genetic algorithm on high temperature superconducting magnet design

The utilization of genetic algorithm on high temperature sup...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Song, Meng Liu, Hao Deng, Xu Zhi Zhang, Yi Ren, Li Shen, Shi Feng Hu, Nan Nan Yunnan Electric Power Research Institute Kunming China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038351368

In high temperature superconducting (HTS) magnet design, it well known that the critical current (Ic) is sensitive to the direction of the local magnetic field. The perpendicular magnetic field component to the face of tape have a larger effect on the Ic of a HTS tape than the parallel component. Thus in HTS magnet design, the magnetic field distribution is the first considering factor. This work presents a HTS magnet design using genetic algorithm to obtain the object. When the length of the tape is certain, the results show that the process gives the optimal number of the double pancake and the inner radius of the magnet. © (2014) Trans Tech Publications, Switzerland.

关键词： Superconducting magnets

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The models of superconducting power facilities: The effect of different tape

The models of superconducting power facilities: The effect o...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Song, Meng Su, Lu Shun Deng, Xu Zhi Ren, Li Shen, Shi Feng Zhang, Yi Hu, Nan Nan Yunnan Electric Power Research Institute Kunming China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038351368

Due to the high current density in 77K, the high temperature superconducting facilities are expected to improve the efficient in power transmission. Superconducting facilities electromagnetic design is highly dependent on the characteristic of the superconducting tape. As a result, the comparison of the effect of different tape in electromagnetic design should be studied. In this paper, several facilities model are used as example to analyze the effect of different tape utilization. The result shows in different application conditions, or, specific benefits are considered, there is a specific tape will be the best choice. © (2014) Trans Tech Publications, Switzerland.

关键词： High temperature superconductors

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