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Stress Analysis and Bobbin Structure Optimization Design of a 35kV HTS-controllab.e Reactor

Physics Procedia 2015年 65卷 278-281页

作者： Z. Wang L. Ren S. Shen M. Song Y. Zhang H. Liu L. Chen B. Yu N. Hu State Key Lab of Advanced Electromagnetic Engineering and Technology (R&D Center of Applied Superconductivity Huazhong University of Science and Technology) 1037 Luoyu Road Wuhan 430074 P. R. China

A 35kV high temperature superconducting controllab.e reactor (HTS-CR) is under development and the electromagnetic design has been completed. Due to the AC conditions, the thermal stress caused by AC losses can be so strong that the stress analysis should be carried out to verify that the maximum stress under different operating conditions is in appropriate range. In addition, Lorentz force of HTS windings will impact the bobbin structure of the HTS windings which will endanger the 35 kV HTS-CR. Stress analysis is important for the design of a mechanically stable structure. This paper provides the analysis of the bobbin structure and its result of optimization design considering the requirements of safety and cooling.

关键词： thermal stress analysis bobbin structure optimization design

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A scalab.e all-optical VPN in multiple PONs with a two-stage TDM-WDM architecture 33

A scalable all-optical VPN in multiple PONs with a two-stage...

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2007 33rd European Conference and Exhibition of Optical Communication, ECOC 2007

作者： Tian, Yue Ye, Tong Leng, Lufeng Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai JiaoTong University Shanghai200240 China New York City College of Technology City University of New York 300 Jay Street BrooklynNY11201 United States

We demonstrate optical VPN among different PONs using ASK/FSK format The scalab.lity is enhanced by using a bidirectional amplifier at the OLT and the FSK format combined with low-loss FBG reflectors for VPN traffic.

ISBN: (纸本)9783800730421

关键词： Passive optical networks

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Directly wireless communication of human minds via non-invasive brain-computer-metasurface platform

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eLight 2022年第1期2卷 132-142页

作者： Qian Ma Wei Gao Qiang Xiao Lingsong Ding Tianyi Gao Yajun Zhou Xinxin Gao Tao Yan Che Liu Ze Gu Xianghong Kong Qammer HAbbasi Lianlin Li Cheng‑Wei Qiu Yuanqing Li Tie Jun Cui Institute of Electromagnetic Space Southeast UniversityNanjing 210096China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China State Key Laboratory of Millimeter Wave Southeast UniversityNanjing 210096China Center of Intelligent Metamaterials Pazhou Laboratory Guangzhou 510330China Research Center for Brain-Computer Interface Pazhou LabGuangzhou 510330China Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore University of Glasgow James Watt School of EngineeringGlasgow G128QQUK State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking UniversityBeijing 100871China

Brain-computer interfaces(BCIs),invasive or non-invasive,have projected unparalleled vision and promise for assisting patients in need to better their interaction with the *** by the BCI-based rehabilitation technologies for nerve-system impairments and amputation,we propose an electromagnetic brain-computer-metasurface(EBCM)paradigm,regulated by human’s cognition by brain signals directly and *** experimentally show that our EBCM platform can translate human’s mind from evoked potentials of P300-based electroencephalography to digital coding information in the electromagnetic domain non-invasively,which can be further processed and transported by an information metasurface in automated and wireless *** wireless communications of the human minds are performed between two EBCM operators with accurate text ***,several other proof-of-concept mind-control schemes are presented using the same EBCM platform,exhibiting flexibly-customized capabilities of information processing and synthesis like visual-beam scanning,wave modulations,and pattern encoding.

关键词： communication computer surface

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Bayesian Game Based Power Control Scheme for Inter-WBAN Interference Mitigation

Bayesian Game Based Power Control Scheme for Inter-WBAN Inte...

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IEEE Global Communications Conference

作者： Lei Zou Bin Liu Chang Chen Chang Wen Chen CAS Key Lab. of Electromagnetic Space Information University of Science and Technology of China Computer Science and Engineering Department University at Buffalo the State University of New York

ISBN: (纸本)9781479935130

Wireless body area network (WBAN) is an emerging technology that provides socialized health monitoring service. However, the quality of service can be severely degraded by concomitant inter-WBAN interference in some specific environments where multiple WBANs are densely deployed, e.g., hospitals and senior citizen communities. In this work, we propose a Bayesian game based power control scheme to mitigate the impact of inter-WBAN interference. By modeling WBANs as players and active links as types of players in the Bayesian game model, the proposed power control scheme tries to maximize each player's expected payoff involving both throughput and energy efficiency. We prove the existence of Bayesian equilibrium (BE) for the proposed power control game and also derive a practical sufficient condition for the uniqueness of BE. A harmonic mean based algorithm is then proposed to obtain an approximation of BE point without the need to pass message among WBANs, which satisfies the non-cooperative manner for inter-WBAN interference mitigation. Simulation results show that the proposed algorithm can converge to the BE point effectively.

关键词： WBAN Power Control Bayesian Game

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Tolerance analysis of an assembly by considering part deformation 16

Tolerance analysis of an assembly by considering part deform...

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16th CIRP Conference on Computer Aided Tolerancing, CIRP CAT 2020

作者： Junnan, Zhi Yanlong, Cao Fan, Liu Ting, Liu Jiangxin, Yang State Key Laboratory of Fluid Power and Mechatronic Systems College of Mechanical Engineering Zhejiang University Hangzhou310027 China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province College of Mechanical Engineering Zhejiang University Hangzhou310027 China Key Lab. of Digit. Des. and Intelligent Mfg. for Creative Cultural Products of Zhejiang Province Lishui323000 China

Part error will cause the assembly contact state between parts to deviate from the nominal state, resulting in error accumulation and propagation. Therefore, reasonable tolerance has to be applied to control the corresponding errors. Currently there are a number of tolerance analysis methods, however, most of them typically only consider dimensional and geometrical tolerances in the design phase. Analysis results without considering part deformation which was commonly observed in the realistic working conditions could lead to possible assembly failures. In this paper, both manufacturing and deformation errors are taken into account to establish a more comprehensive deviation calculation model based on Polytope-Skin Model Shape method. The total assembly error can be determined by calculating the Minkowski sum. The effectiveness of the proposed method is verified in a case study about an assembly of one-joint manipulator in which the external force is the cause of the change on part shape and size. © 2020 The Authors. Published by Elsevier B.V.

关键词： Deformation

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An Improved Interleaved Buck/Boost Integrated CLLLC Three-Port DC-DC Converter for Wide Input Range 2

An Improved Interleaved Buck/Boost Integrated CLLLC Three-Po...

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2nd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2021

作者： Yan, Xu Liu, Caifeng Liu, Shuang Guo, Xiang Zou, Xudong Huazhong Uni. of Sci. and Tech State Key Lab. of Advanced Electromagnetic Eng. and Tech Wuhan China China-EU Institute for Clean and Renewable Energy Huazhong Uni. of Sci. and Tech. Wuhan430074 China School of Electrical and Electronic Engineering Huazhong Uni. of Sci. and Tech. Wuhan430074 China

ISBN: (纸本)9781665400640

Power electronic converters are widely used in renewable energy generation scenarios. However, the power fluctuations of renewable energy will make DC microgrid bus voltage perturbed. As a result, the input voltage for the converter is not constant. This paper proposes an improved three-port converter with the advantages of wide input voltage and high integration levels. The interleaved Buck/Boost integrated CLLLC (IBBI-CLLLC) converter can balance power difference by the energy storage device, which expands the operation range. Then, an improved PWM+PFM modulation method is proposed in this paper. By satisfying a specific relationship between duty cycle and switching frequency, the CLLLC converter has no power return phenomenon when the secondary switches are in the synchronous rectification state, which improves the efficiency of the converter. Moreover, the converter has a wide range of DC gain and can realize zero voltage switching (ZVS) in a wide input voltage range. Finally, the correctness of the theoretical analysis is verified by simulation. © 2021 IEEE.

关键词： Zero voltage switching

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Transmission Properties of Radar Wave through Reentry Plasma Sheath

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Journal of Electronic Science and technology of China 2007年第1期5卷 29-32,37页

作者：高正平马兆国刘静李仲平张大海 Engineering Research Center of Electromagnetic Wave Absorbing Materials Ministry of EducationUniversity of Electronic Science and Technology of China State Key Lab. of Electronic Thin Films & Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China National Key Laboratory of Advanced Functional Composite Materials 9200 Box

In this paper, by taking into account the coupling of the ionization of ablation gas and atmosphere, an electrons density distribution model is built. Using this model, the transmission properties of different polarization radar wave through sheath are evaluated on the basis of the transmission matrix theory. Then, we discuss the effects of the electrons density, the added magnetic field, and the radar wave frequency on the transmission properties. As a result of this investigation, greater transmission power could be gained in order to efficiently shorten communication blackout, by reducing the electrons density or choosing proper added magnetic field and the frequency of the radar wave according to the different polarization form of the radar wave.

关键词： communication blackout plasma sheath radar wave reentry transmigsion properties

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Obtaining frequency-time diagram from perturbation signal-time diagram 7

Obtaining frequency-time diagram from perturbation signal-ti...

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7th International Conference on Physics, Mathematics and Statistics, ICPMS 2024

作者： Liu, Xiaoyuan Zhang, Yuxin Dai, Runrui Lai, Zongqiang Qiu, Huibin Shen, Chengshuo Weng, Huang Wu, Shengfa Zheng, Wei Zhang, Wei Liang, Wenxiang Han, Qianhao Li, Xiaobin Liu, Lihuan Shi, Chunhui Xu, Ting Zhang, Haotian Fan, Jiayu Yu, Meiping Tao, Jiajun Jiangxi Province Key Laboratory of Fusion and Information Control Department of Physics Nanchang University Nanchang330031 China NCU-ASIPP Magnetic Confinement Fusion Joint Lab Institute of Fusion Energy and Plasma Application Nanchang University Nanchang330031 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

In the field of nuclear fusion energy development, magnetic confinement tokamak reactors, which use strong magnetic fields to confine high-temperature plasmas, are crucial for sustainable and clean fusion energy. Disruption caused by plasma instability can terminate the fusion reaction and even cause irreparable damage to the equipment. Therefore, a thorough understanding of the underlying physical mechanisms is essential for predicting and preventing plasma disruption. The recently proposed analytical theory of plasma disruption may predict and prevent plasma disruption, but its validation requires the frequency-time signals. The Heavy Ion Beam Probe (HIBP) can provide such signals, however, because its scarcity in the world, particularly in China, it is necessary to develop more suitable methods. Here we show a new approach that employs Fast Fourier Transform (FFT) on magnetic perturbation signals to obtain frequency-time diagrams. We successfully applied this algorithm to acquire the frequency-time diagram of the J-TEXT-1054560 discharge. This new method offers an effective tool for validating the plasma disruption theory, overcoming the limitations of traditional techniques and providing a crucial methodological basis for understanding and predicting plasma disruption. This new analytical approach will accelerate the advancement of fusion technology. © Published under licence by IOP Publishing Ltd.

关键词： Heavy ions

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Excess Activity Tuned by Distorted Tetrahedron in CoMoO_(4) for Oxygen Evolution

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Energy & Environmental Materials 2024年第1期7卷 247-252页

作者： Hengbo Xiao Kai Chi Hongxia Yin Xiangji Zhou Pengxiang Lei Peizhi Liu Jiakun Fang Xiuhong Li Songliu Yuan Zhen Zhang Yaqiong Su Junjie Guo Lihua Qian School of Physics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Hubei University of TechnologyWuhan 430068China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China State Key Lab of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hubei University of TechnologyWuhan 430068China Department of Stomatology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry Xi'an Jiaotong UniversityXi'an 710049China

Oxygen vacancies enable modulating surface reconstruction of transition metal oxides containing metal-oxygen polyhedrons into metallic oxyhydroxide for oxygen evolution reaction(OER),while revealing reconstructing mechanism is stuck by the requirement to precisely control exact sites of these ***,oxygen vacancies are localized only within MoO_(4)tetrahedrons rather than CoO_(6)octahedrons in CoMoO_(4)catalyst,guaranteeing coherent reconstruction of CoO_(6)octahedrons into pure CoOOH with tunable activities for ***,distorted tetrahedron accelerates the dissolution of Mo atoms into alkaline electrolyte,triggering spontaneous transition of partial CoMoO_(4)into Co(OH)_(2).CoO_(6)octahedrons in both CoMoO_(4)and Co(OH)_(2)can transform pure CoOOH completely at lower potential,resulting in excess intrinsic activity whose summit is identified by overpotential at 10 mA cm^(-2)with 22.9%reduction and Tafel slope with 65.3%***-defined manipulation over the distorted polyhedrons offers one versatile knob to precisely modulate electronic structure of oxide catalysts with outstanding OER performance.

关键词： metal-oxygen polyhedron oxygen evolution reaction oxygen vacancy Raman spectroscopy

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Output feedback adaptive robust learning control of a class of nonlinear systems with periodic disturbances

Output feedback adaptive robust learning control of a class ...

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作者： Liu, Xiangbin Hou, Zhongsheng Yao, Bin Su, Hongye Sun, Mingxuan Advanced Control Systems Laboratory School of Electronics and Information Engineering Beijing Jiaotong University Beijing 100044 China School of Mechanical Engineering Purdue University West Lafayette IN 47907 United States State Key Lab. of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 China College of Information Engineering Zhejiang University of Technology Hangzhou 310032 China

ISBN: (纸本)9783902661937

In this paper, a discontinuous projection-based output feedback adaptive robust learning control (OARLC) scheme is constructed for a class of nonlinear systems in a semi-strict feedback form by incorporating an observer and a dynamic normalization signal. Since only output signal is availab.e for measurement, an observer is firstly designed to provide exponentially convergent estimates of the unmeasurable states. Using certain known basis functions to capture the characteristics of unknown general periodic disturbances, the discontinuous projection type adaptation law can then be used to tune the amplitudes of those basis functions on-line to recover the unknown general periodic disturbances asymptotically. The estimation errors due to the unknown initial states, uncompensated disturbances, and the uncertain nonlinearities are also effectively dealt with via certain robust feedback at each step of the proposed OARLC backstepping design. The resulting controller achieves a guaranteed transient and a prescribed final tracking accuracy for output tracking performance. In addition, when the general periodic disturbances fall within the approximation ranges of the periodic basis functions, asymptotic output tracking performance is achieved as well. © 2011 IFAC.

关键词： Feedback

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