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International Conference on Electrical Machines

作者： Pei Zheng Jian Li Ronghai Qu Haiyang Fang State Key State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 Hubei China

ISBN: (纸本)9781509025398

This paper aims to provide some useful instructions to electromagnetic design of high-speed permanent-magnet machines. In this paper, the electromagnetic design procedure is illustrated with a 2 poles 40,000 rpm prototype machine. In order to determine a rotor structure with good performance, rotor design including rotor structure, pole arc and magnetization direction of magnets are analyzed respectively. On the other hand, two machines with different stator cores but same rotors are studied. And a novel method of stator winding design is provided to have more options for the design by increasing number of parallel branches. Finally, the influence of stator slot opening and number of segmentations in magnets to rotor eddy-current loss are discussed. Smaller stator slot opening would reduce the rotor eddy-current loss, but it brings some processing technic problems. And segmentation in magnets would reduce the eddy-current loss in magnets only.

关键词： electromagnetic design High-speed permanent magnet machines Rotor eddy-current loss

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The research for power allocation strategy of the hybrid energy storage units in distributed generation system

The research for power allocation strategy of the hybrid ene...

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International Conference on Mechatronics engineering and Electrical engineering, CMEEE 2014

作者： Yang, Z.L. Chen, P. Wang, L.J. Wang, Y.H. Xiao, F. Wang, X.W. Yang, H. State Grid Hubei Electric Power Company Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781138027190

Aiming at the hybrid energy storage units with AC bus lines in distributed generation system, this paper puts forward a power allocation strategy for the hybrid energy storage units. The method retarded the over-charge/over-discharge phenomena of the energy storage units by adjusting the SOC values of the energy storage units in a certain range, through the power command of low-pass filter’s effective distribution between the battery and super-capacitor, according to the SOC value of the battery and super-capacitor. At the same time, it took the state of charge/discharge into account, adjust the filter time constant to ensure that the SOC value of the energy storage units is maintained in a certain range. In PSCAD, the simulation results prove the effectiveness of power allocation strategy in hybrid energy storage units. © 2015 Taylor & Francis Group, London.

关键词： Bandpass filters

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Slotting optimization of automated storage and retrieval system (AS/RS) for efficient delivery of parts in an assembly shop using genetic algorithm: A case Study

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IOP Conference Series: Materials Science and engineering 2017年第1期215卷

作者： L Yue Z Guan C He D Luo U Saif State Key Lab of Digital Manufacturing Equipment and Technology Wuhan 430074 China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China HUST-SANY Joint Lab of Advanced Manufacturing Wuhan 430074 China

In recent years, the competitive pressure on manufacturing companies shifted them from mass production to mass customization to produce large variety of products. It is a great challenge for companies nowadays to produce customized mixed flow mode of production to meet customized demand on time. Due to large variety of products, the storage system to deliver variety of products to production lines influences on the timely production of variety of products, as investigated from by simulation study of an inefficient storage system of a real Company, in the current research. Therefore, current research proposed a slotting optimization model with mixed model sequence to assemble in consideration of the final flow lines to optimize whole automated storage and retrieval system (AS/RS) and distribution system in the case company. Current research is aimed to minimize vertical height of centre of gravity of AS/RS and total time spent for taking the materials out from the AS/RS simultaneously. Genetic algorithm is adopted to solve the proposed problem and computational result shows significant improvement in stability and efficiency of AS/RS as compared to the existing method used in the case company.

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Graphene Foams: A Bubble‐Derived Strategy to Prepare Multiple Graphene‐Based Porous Materials (Adv. Funct. Mater. 23/2018)

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advanced Functional Materials 2018年第23期28卷

作者： Rujing Zhang Ruirui Hu Xinming Li Zhen Zhen Zhenhua Xu Na Li Limin He Hongwei Zhu Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Department 5 P.O. Box 81‐5 AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China International Center for Materials Nanoarchitectonics (WPI‐MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

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Correction to: 2021 Taxonomic update of phylum Negarnaviricota (Riboviria: Orthornavirae), including the large orders Bunyavirales and Mononegavirales

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Archives of virology 2021年第12期166卷 3567-3579页

作者： Jens H Kuhn Scott Adkins Bernard R Agwanda Rim Al Kubrusli Sergey V Alkhovsky Gaya K Amarasinghe Tatjana Avšič-Županc María A Ayllón Justin Bahl Anne Balkema-Buschmann Matthew J Ballinger Christopher F Basler Sina Bavari Martin Beer Nicolas Bejerman Andrew J Bennett Dennis A Bente Éric Bergeron Brian H Bird Carol D Blair Kim R Blasdell Dag-Ragnar Blystad Jamie Bojko Wayne B Borth Steven Bradfute Rachel Breyta Thomas Briese Paul A Brown Judith K Brown Ursula J Buchholz Michael J Buchmeier Alexander Bukreyev Felicity Burt Carmen Büttner Charles H Calisher Mengji Cao Inmaculada Casas Kartik Chandran Rémi N Charrel Qi Cheng Yuya Chiaki Marco Chiapello Il-Ryong Choi Marina Ciuffo J Christopher S Clegg Ian Crozier Elena Dal Bó Juan Carlos de la Torre Xavier de Lamballerie Rik L de Swart Humberto Debat Nolwenn M Dheilly Emiliano Di Cicco Nicholas Di Paola Francesco Di Serio Ralf G Dietzgen Michele Digiaro Olga Dolnik Michael A Drebot J Felix Drexler William G Dundon W Paul Duprex Ralf Dürrwald John M Dye Andrew J Easton Hideki Ebihara Toufic Elbeaino Koray Ergünay Hugh W Ferguson Anthony R Fooks Marco Forgia Pierre B H Formenty Jana Fránová Juliana Freitas-Astúa Jingjing Fu Stephanie Fürl Selma Gago-Zachert George Fú Gāo María Laura García Adolfo García-Sastre Aura R Garrison Thomas Gaskin Jean-Paul J Gonzalez Anthony Griffiths Tony L Goldberg Martin H Groschup Stephan Günther Roy A Hall John Hammond Tong Han Jussi Hepojoki Roger Hewson Jiang Hong Ni Hong Seiji Hongo Masayuki Horie John S Hu Tao Hu Holly R Hughes Florian Hüttner Timothy H Hyndman M Ilyas Risto Jalkanen Dàohóng Jiāng Gilda B Jonson Sandra Junglen Fujio Kadono Karia H Kaukinen Michael Kawate Boris Klempa Jonas Klingström Gary Kobinger Igor Koloniuk Hideki Kondō Eugene V Koonin Mart Krupovic Kenji Kubota Gael Kurath Lies Laenen Amy J Lambert Stanley L Langevin Benhur Lee Elliot J Lefkowitz Eric M Leroy Shaorong Li Longhui Li Jiànróng Lǐ Huazhen Liu Igor S Lukashevich Piet Maes William Marciel de Souza Marco Marklewitz Sergio H Marshall Shin-Yi L Marzano Se Integrated Research Facility at Fort Detrick National Institute of Allergy and Infectious Diseases National Institutes of Health Frederick MD USA. kuhnjens@mail.nih.gov. United States Department of Agriculture Agricultural Research Service US Horticultural Research Laboratory Fort Pierce FL USA. Zoology Department National Museums of Kenya Nairobi Kenya. Jomo Kenyatta University of Agriculture & Technology Nairobi Kenya. Division Phytomedicine Faculty of Life Sciences Humboldt-Universität zu Berlin Berlin Germany. D.I. Ivanovsky Institute of Virology of N.F. Gamaleya National Center on Epidemiology and Microbiology of Ministry of Health of Russian Federation Moscow Russia. Department of Pathology and Immunology Washington University School of Medicine St. Louis MO USA. Faculty of Medicine University of Ljubljana Ljubljana Slovenia. Centro de Biotecnología y Genómica de Plantas Universidad Politécnica de Madrid-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria Campus de Montegancedo Pozuelo de Alarcón Madrid Spain. Departamento de Biotecnología-Biología Vegetal Escuela Técnica Superior de Ingeniería Agronómica Alimentaria y de Biosistemas Universidad Politécnica de Madrid Madrid Spain. Center for Ecology of Infectious Diseases Department of Infectious Diseases Department of Epidemiology and Biostatistics Insitute of Bioinformatics University of Georgia Athens GA USA. Institute of Novel and Emerging Infectious Diseases Friedrich-Loeffler-Institut Federal Research Institute for Animal Health Greifswald-Insel Riems Germany. Department of Biological Sciences Mississippi State University Mississippi State MS USA. Center for Microbial Pathogenesis Institute for Biomedical Sciences Georgia State University Atlanta GA USA. Edge BioInnovation Consulting and Mgt Frederick MD USA. Institute of Diagnostic Virology Friedrich-Loeffler-Institut Greifswald-Insel Riems Germany. UFyMA INTA-CONICET Cordoba Argentina. Genomics and Bioinformatics D

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Performance Analysis of GPU-Based Convolutional Neural Networks

Performance Analysis of GPU-Based Convolutional Neural Netwo...

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International Conference on Parallel Processing (ICPP)

作者： Xiaqing Li Guangyan Zhang H. Howie Huang Zhufan Wang Weimin Zheng Tsinghua National Laboratory for Information Science and Technology State Key Lab of Mathematical Engineering and Advanced Computing Wuxi China Department of Computer Science and Technology Tsinghua University Department of Electrical and Computer Engineering George Washington University

ISBN: (纸本)9781509028245

As one of the most important deep learning models, convolutional neural networks (CNNs) have achieved great successes in a number of applications such as image classification, speech recognition and nature language understanding. Training CNNs on large data sets is computationally expensive, leading to a flurry of research and development of open-source parallel implementations on GPUs. However, few studies have been performed to evaluate the performance characteristics of those implementations. In this paper, we conduct a comprehensive comparison of these implementations over a wide range of parameter configurations, investigate potential performance bottlenecks and point out a number of opportunities for further optimization.

关键词： Convolution Graphics processing units Runtime Training Computational modeling Computer architecture Kernel

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Design Procedure of Flux Reversal Permanent Magnet Machines

Design Procedure of Flux Reversal Permanent Magnet Machines

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International Conference on Electrical Machines

作者： Yuting Gao Ronghai Qu Dawei Li Jian Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781509025398

Flux reversal permanent magnet machines (FRPMMs) exhibit many advantages such as simple rotor configuration, high torque density, fast transient response, etc. However, the general design procedure of FRPMMs has not been established. Thus, this paper mainly focuses on developing a design methodology of three-phase FRPMMs. First, the sizing equations are analytical derived based on a magneto motive force (MMF)-permeance model. Then, the influences of several key parameters in the sizing equation including slot-pole combination, airgap radius, electric loading and equivalent magnetic loading on the torque density are analyzed. Moreover, the feasible slot-pole combinations are summarized and the corresponding winding types are recommended in order to maximize the output torque. Besides, the detailed geometric design of stator and rotor are presented. Finally, the proposed design method is verified by 2D finite element analysis (FEA) and experiments on a 12-slot/17-pole FRPMM prototype.

关键词： Design procedure Flux reversal permanent magnet machine (FRPMM) Sizing equation Finite element analysis (FEA)

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Grain refinement mechanism of as-cast aluminum by hafnium

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Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3059-3069页

作者： Hong-ying LI De-wang LI Zhi-xiang ZHU Bao-an CHEN Xin CHEN Chang-long YANG Hong-yu ZHANG Wei KANG School of Materials Science and Engineering Central South University Changsha 410083 China New Electrical Materials and Microelectronics Department Global Energy Interconnection Research Institute Beijing 102211 China State Key Lab of Advanced Power Transmission Technology Beijing 102211 China State Grid Liaoning Electric Power Supply Co. Ltd. Shenyang 110006 China

The effect of Hf on the grain refinement of as-cast aluminum was investigated using optical microscopy, electron microscopy and X-ray diffraction. The result shows that the grain size of studied alloy decreases effectively with the addition of Hf,Hf can react with Al to form Al3Hf particles during the solidification, the primary Al3Hf particles are highly potent nucleants for Al and the nanoscale coherent Al3Hf particles can inhibit the grain growth by pinning effect. The grain refinement mechanism of studied alloys was verified by the solute theory and the crystallography study, and it can be divided into two distinct types: At low Hf contents, there are no primary Al3Hf phases to form, the acquired grain refinement is primarily attributed to the constitutional undercooling induced by the Hf solute. At medium and high Hf contents, both Hf solute and Al3Hf particles contribute to the refinement.

关键词： grain refinement mechanism aluminum alloy casting Hf Al3Hf

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Density functional theory investigation of oxygen interaction with boron-doped graphite

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Applied Surface Science 2016年 390卷 273-282页

作者： Juan Liu Chen Wang Tongxiang Liang Wensheng Lai State Key Lab of New Ceramic and Fine Processing Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Advanced Material Laboratory School of Materials Science & Engineering Tsinghua University Beijing 100084 China

Boron inserted as impurity by substitution of carbon atoms in graphite is known to change (improve or deteriorate) oxidation resistance of nuclear graphite, but the reason for both catalytic and inhibiting oxidation is still uncertain. As a first step, this work is more specially devoted to the adsorption and diffusion of oxygen atoms on the surface and related to the problem of oxygen retention on the pure and boron-containing graphite surfaces. Adsorption energies and energy barriers associated to the diffusion for molecular oxygen recombination are calculated in the density functional theory framework. The existence of boron modifies the electronic structure of the surface, which results in an increase of the adsorption energy for O. However, low boron loading makes it easier for the recombination into molecular oxygen. For high boron concentration, it induces a better O retention capability in graphite because the presence of B-B bonds decreases recombination of the adsorbed oxygen atoms. A possible explanation for both catalytic and inhibiting effects of boron in graphite is proposed.

关键词： Density functional calculations Chemisorption Graphite Boron Oxygen

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Design of High Power IGBT Interlocking Drive and Protect Circuit Supplied by Single Power Based on ACPL-332J

Design of High Power IGBT Interlocking Drive and Protect Cir...

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International Conference on Electrical Machines and Systems

作者： Yuan Zhu Kai Yang Dezhang Lou Tianbao Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 R.P China

ISBN: (纸本)9781467388634

This paper proposes a novel design of high power IGBT interlocking drive and protect circuit supplied by single power based on ACPL-332J chip. Firstly, it introduces the basic principle of interlocking drive circuit. Then, peripheral protect circuit is presented in detail, including chip protect circuit and IGBT protect circuit. Why and how to choose parameters of each component also are described. A novel interlocking drive circuit, without adding any components, is designed to prevent short circuit of DC bus when gate drive signals of the upper and lower IGBTs in the same phase are turned on at the same time. This IGBT interlocking drive and protect circuit is proved to be stable and reliable in Servo drive system of PMSM by experiment.

关键词： permanent magnetic synchronous motor (PMSM) interlocking drive IGBT single power supply ACPL-332J over current protect circuit of IGBT

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