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International Congress on Image and Signal Processing

作者： Lizhen Deng Hu Zhu Guanming Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Jiangsu Province Key Lab on Image Processing & Image Communication Nanjing University of Posts and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781479927654

Deconvolution has become one of the most used methods for improving spectral resolution, and blind deconvolution as a typical method has been researched widely. However, the predefined point spread function (PSF) used in blind deconvolution method is not known exactly in practice. In general, the PSF is estimated simultaneously from the observed spectrum, but it becomes difficult when the spectroscopic data are polluted by strong noise. In this paper, we present a deconvolution method used to improve the resolution of THz spectrum. In the method, the energy function is constructed, which includes the likelihood term, Total variation of spectrum term and L2 norm of the PSF term. The PSF is modeled as a parametric function combination with the a priori knowledge about the characteristics of the instrumental response. The spectrum and the parameter of PSF are obtained by minimizing the energy functional using alternate minimization approach. Experimental results are shown to demonstrate the efficiency of the proposed method used for THz spectrum.

关键词： THz spectrum Total variation deconvolution alternate minimization approach

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Numerical modeling the interaction between externally applied resonant magnetic perturbations and tearing instabilities

Numerical modeling the interaction between externally applie...

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第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者： Qiming Hu Q.Yu Bo Rao Ge Zhuang Yonghua Ding Wei Jin Nengchao wang Xiwei Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Max-Planck-Institut für Plasmaphysik EURATOM association85748 GarchingGermany

To compare with resonant magnetic perturbations(RMPs) related experimental results observed in J-TEXT tokamak,nonlinear numerical modeling based on reduced MHD equations has been carried *** experimental parameters as input,both the mode locking and mode stabilization by RMPs are also obtained from numerical modeling. Further calculations have been carried out to study the plasma parameters affecting the mode stabilization by RMPs,including the plasma rotation frequency,viscosity,Alfven velocity and the RMP *** is found that the suppression of the tearing mode by RMPs of moderate amplitude is possible for a sufficiently high ratio of plasma rotation velocity to the Alfven speed.A larger plasma viscosity enhances the mode stabilization. In addition,the non-uniform mode rotation frequency,modulated by electromagnetic force(Fern) and viscous force(Fvs),results in the applied RMPs contributing both net stabilizing and braking effect on *** evaluation based on analytical theory shows the applied RMP contributes a dominant stabilizing effect,which are responsible for the suppression of *** dynamics of the first discovered small locked island(SLI) are *** is found that the island is locked at the stabilizing phase and the saturated island width is less than the linear layer *** simulated Mirnov signal indicates the small locked island is likely to be the complete suppression case observed in experiments. The comparisons between the numerical and experimental results are in good agreement.

关键词： Numerical modeling the interaction between externally applied resonant magnetic perturbations and tearing instabilities

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Cooperation mechanism of wide-area protection system based on multi-agents

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Telkomnika - Indonesian Journal of Electrical engineering 2013年第1期11卷 195-202页

作者： Zhang, Mingzhu Li, Zhenxing School of Mathematics and Statistics Xuchang University Henan Province China The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

With the rapid growth of power system, it is becoming increasingly difficult to realize reach and time coordination for conventional backup protection. To cope with those problems, wide-area protection is widely researched. In this paper, a novel dynamic cooperation mechanism of wide-areaprotection is proposed, which can operate better than distributed and centralized systems with respect to reliability, section selectivity, and so on. The multi-agents technology is used to enhance adaptability and decrease communication traffic of wide-area protection system. The improvement of backup protection performance to overcome some specific conditions, such as communication bit error, protection failure, and breaker failure, is also illustrated by utilizing communication networks and distributed protection agents which enables an easy and flexible construction and operation of the proposed wide-area protection system. The example analysis on IEEE 5 nodes system shows the concrete cooperation processing among agents in the cases of typical faults. © 2013 Universitas Ahmad Dahlan.

关键词： Multi agent systems

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High Power Factor Vernier Permanent Magnet Machines

High Power Factor Vernier Permanent Magnet Machines

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IEEE Energy Conversion Congress and Exposition

作者： Dawei Li Ronghai Qu Thomas Lipo State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical & Electronic Engineering Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering University of Wisconsin Madison Madison USA

ISBN: (纸本)9781479903375

Vernier permanent magnet (VPM) machines are well known for high torque density but low power factor. This paper deals with the low power factor of VPM machines. The goal is not obtained by reducing the electrical loading or adjusting current advance angle but proposing a novel vernier topology- dual-stator, spoke-array (DSSA) VPM topology. In this paper, the characteristics, such as active part, auxiliary mechanical structure and rotor anisotropy, of the DSSA VPM topology are analyzed in detail. Performances, including power factor, torque density, and cogging torque etc., are evaluated based on finite element analysis (FEA). The analysis results show that the DSSA VPM topology exhibits high power factor viz.,～0.9 and significantly high torque capability. Finally, the prototype machine has been designed, built, and is under testing. The verification of the mechanical structure scheme is done in this paper, and the experimental results will be presented in the near future.

关键词： High power factor dual-stator spoke-array vernier permanent magnet machine Reactive power Domain-Specific Software Architecture high torque Permanent magnet synchronous machines cogging torque MECHANICAL STRUCTURES machine topology

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Precision study for surface tension driven self-assembly of hingeless structures

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Journal of Applied Sciences 2013年第14期13卷 2807-2812页

作者： Yang, Lei Wang, Chunqing Liu, Wei State Key Lab of Advanced Welding and Joining School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Surface tension driven self-assembly has been demonstrated to be a promising method for mass production of highly 3-D MEMS structures. However, factors and their mechanisms affecting the self-assembly precision of the hingeless structures are still barely understood. This study addresses and analyzes some of the factors, including the inherent instability of the hingeless structures, scale effect and the deformations of the limiter structure which limits the self-assembly precision of hingeless structures. An energy based model, verified by the experimental results, was introduced to evaluate the adverse effect of each factor on the precision. This precision study can serve as an optimum guideline for the designs of self-assembly MEMS microstructures and allow the creation of high precise MEMS applications. © 2013 Asian Network for Scientific Information.

关键词： Self assembly

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A bidirectional multi-band 60-GHz wireless-over-fiber transmission system with compacted base station and mobile terminal using a robust mm-Wave LO free technique

A bidirectional multi-band 60-GHz wireless-over-fiber transm...

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Optical Fiber Communication Conference, OFC 2013

作者： Ye, Chenhui Zhang, Liang Zhu, Ming Rao, Lan Yu, Jianjun Su, Yikai He, Sailing Chang, Gee-Kung State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310058 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China

For the first time, bidirectional multi-band multi-gigabit wireless-over-fiber transmission at 60-GHz mm-wave band has been accomplished with centrally supplied LO service. It does not require mm-wave LO devices in ea... 详细信息

ISBN: (纸本)9781557529626

关键词： Base stations

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Research on the micro-void discharge in power frequency and high frequency

Research on the micro-void discharge in power frequency and ...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Qifu Lu Qizheng Ye Hong Lv Xingwang Li Chu Yang Siyang Wu Electric Power Research Institute of Guangdong Power Grid Corporation Guangdong China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479925988

In this paper, a type of typical PD source, micro-void discharge, is designed and fabricated to imitate the defects in GIS online. The void in solid insulation is carved by the laser inside-carving machine and the machining operation, respectively. Comparing these two kinds of void discharge, a single void discharge form can be obtained using the void carved by the laser inside-carving machine. The void discharge characteristics in power frequency and high frequency are also compared and analyzed. The singleness of discharge forms in high frequency is better. The experimental results will be applied in PD monitoring and materials testing.

关键词： Discharges (electric) Partial discharges Fault location Lasers Gas insulation Machining

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Advances in synthetic aperture radar micro-motion target indication (SAR/MMTI)

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2013年第12期41卷 2436-2442页

作者： Deng, Bin Wu, Cheng-Guang Qin, Yu-Liang Li, Xiang Wang, Hong-Qiang State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information Syst. Changsha Hunan 410073 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China

Target micro-motion conveys vital information which is favorable for understanding synthetic aperture radar (SAR) images. However, image defocusing also ensues. Therefore, techniques on micro-motion effect analysis, micro-motion target detection and imaging are gaining more and more attentions in the remote sensing field. These techniques are generally named SAR/micro-motion target indication (SAR/MMTI). In this paper, topics on SAR/MMTI are introduced including its concept, key difficulties, existing experiments, processing approaches, and its application promise. Some directions of future work on SAR micro-motion are predicted at last.

关键词： Synthetic aperture radar

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Preparation of a wafer-level micro polymer lens array with improved performance using a low cost glass mold

Preparation of a wafer-level micro polymer lens array with i...

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46th Annual IMAPS International Symposium on Microelectronics, IMAPS 2013

作者： Ma, Mengying Qin, Shunjin Shang, Jintang Zhang, Chunwei Zhang, Li Chen, Dong Lai, Chiming Key Lab. of MEMS of Ministry of Education Southeast University Nanjing 210096 China State Key Laboratory of Transducer Technology Chinese Academy of Sciences China Jiangyin Changdian Advanced Packaging Co. Ltd. Jiangyin China School of Mechanical Engineering Southeast University China

ISBN: (纸本)9781629938240

In our work, polymer-based micro lens arrays with spacers were innovativly fabricated by low cost wafer-level glass-silicon molds. The upper glass mold was prepared by a well-controlled hot forming process (HFP) combined with a chemical foaming process (CFP). The under silicon mold was formed by an etching process. Before dispensing UV-curable glue between the two concave molds, the contact surface should be coated with an anti-stick layer. After UV curing and de-molding, the micro lens arrays were successfully fabricated. The lenses were inspected by an atomic force microscope(AFM), a white light interferometer and a beam analyzer. The results demonstrate the excellent quality of surface roughness and optical characteristics. This study indicates the potential of this novel molding process for industrial production.

关键词： Molds

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Plasmonic titanium nitride nanostructures for perfect absorbers

Plasmonic titanium nitride nanostructures for perfect absorb...

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Optical Nanostructures for Photovoltaics, PV 2013

作者： Guler, Urcan Li, Wei Kinsey, Nathaniel Naik, Gururaj V. Boltasseva, Alexandra Guan, Jianguo Kildishev, Alexander V. Shalaev, Vladimir M. School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West Lafayette IN 47907 United States State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China DTU Fotonik Department of Photonics Engineering Technical University of Denmark Lyngby DK-2800 Denmark

We propose a metamaterial based perfect absorber in the visible region, and investigate the performance of titanium nitride as an alternative plasmonic material. Numerical and experimental results reveal that titanium... 详细信息

ISBN: (纸本)9781557529862

关键词： Titanium nitride

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