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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Zhou, Xingyu Tian, Peishuai Hu, Yanqi Sun, Qitai Xiong, Yongqian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

The unique properties of electromagnetic induced transparency (EIT) metamaterials have caused a lot of concern in the field of terahertz wave regulation, but the traditional design methods of metamaterials have the problems of long design cycle and high trial and error cost. Applying deep learning method to the inverse design process of terahertz metamaterials can greatly reduce the design complexity, so that the EIT metamaterial structure can be quickly designed according to the requirements. In this paper, a generative adversarial network (GAN) model for EIT metamaterial structure design is constructed, which realizes the mapping relationship between target spectrum and metamaterial structure parameters. The proposed GAN model can accurately predict structure parameters of the EIT metamaterial according to the target spectrum, and the error between the generated and the real parameters is less than 1μm. Moreover, by introducing the fuzzy processing, the proposed GAN model can accurately generate multiple sets of metamaterial structure according to the same target spectrum, which provides more options for designers. This model offers a novel and efficient design method for EIT metamaterials. © 2023 IEEE.

关键词： Metamaterials

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Recent progress of the ECRH system and initial experimental results on the J-TEXT tokamak

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Plasma Science and technology 2022年第12期24卷 127-137页

作者： Donghui XIA Xixuan CHEN Dengfeng XU Jiangang FANG Junli ZHANG Nengchao WANG Zhoujun YANG Zhongyong CHEN Yonghua DING Wei ZHENG Shaoxiang MA Zhijiang WANG Yuan PAN International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

In order to broaden the range of the plasma parameters and provide experimental conditions for physical research into high-performance plasma,the development of the electron cyclotron resonance heating(ECRH) system for the J-TEXT tokamak was initiated in *** the first stage,the ECRH system operated successfully with one 105 GHz/500 kW/1 s gyrotron in *** than 400 kW electron cyclotron(EC) wave power has been injected into the plasma successfully,raising the core electron temperature to 1.5 *** 2022,another 105 GHz/500 kW/1 s gyrotron completed commissioning tests which signifies that the ECRH system could generate an EC wave power of 1 MW in *** the support of the ECRH system,various physical experiments have been carried out on *** electron thermal transport in ECRH plasmas has been *** ECRH is turned on,the electron thermal diffusivity significantly *** runaway current is elevated when a disruption occurs during ECRH *** the injected EC wave power is 400 kW,the conversion efficiency of runaway current increases from 35% to 75%.Fast electron behavior is observed in electron cyclotron current drive(ECCD) plasma by the fast electron bremsstrahlung diagnostic(FEB).The increase in the FEB intensity implies that ECCD could generate fast electrons.A successful startup with a 200 kW ECW is *** the upgrade of the ECRH system,the J-TEXT operational range could be expanded and further relevant research could be conducted.

关键词： ECRH J-TEXT tokamak electron thermal transport runaway electron current assisted start-up

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Electrolyte effect on electrochemical behaviors of manganese fluoride material for aqueous asymmetric and symmetric supercapacitors

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Rare Metals 2024年第3期43卷 1048-1061页

作者： Zheng-Hua He Jian-Fei Gao Ling-Bin Kong State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050China

Exploring wide voltage window materials is not only an available measure to enhance the energy density of hybrid supercapacitor(HSCs),but also avoids the dynamic mismatch caused by different energy storage mechanisms of two electrodes in assembled symmetrical ***,there are few reports about the wide potential window materials except Bi_(2)O_(3)and VO_(2).Therefore,the MnF_(2)synthesized by solvothermal reaction was served as the electrode for *** MnF_(2)exhibited electrochemical activity in alkaline solution in three-electrode system,especially with a wide potential window from-0.8 to+0.5 V in 2 mol·L^(-1)***,the assembled MnF_(2)//MnF_(2)symmetrical HSC had a potential window of 1.5 V,and it exhibited outstanding long-cycle ***,when MnF_(2)was taken as the negative and positive respectively,the potential windows of asymmetric devices CoMoO_(4)//MnF_(2)and MnF_(2)//Activated Carbon(AC)could reach 1.3 and 1.45 V,respectively,showing excellent cycle *** work shows that MnF_(2)material has great research value in HSC,and provides a new research direction for developing high-performance devices.

关键词： Manganese fluoride Potential window Hybrid supercapacitors Electrochemical performance

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Scan Path Optimization of Discrete Scanning Based on HE-GA in Proton Therapy 4

Scan Path Optimization of Discrete Scanning Based on HE-GA i...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Wang, Xinze Tan, Ping Shen, Xinyi Lin, Yinjie Chen, Songbin Xiong, Haimin Qian, Zhihong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (纸本)9798350305562

Scan path optimization in proton therapy requires efficient intelligent optimization algorithms. In this study, we discuss the optimization of the genetic algorithm (GA) for scan path optimization from three aspects: generating initial paths using heuristic algorithms, optimizing the genetic parameters of GA, and incorporating an elite preservation strategy. We propose a heuristic elite-genetic algorithm (HE-GA) and compare it with commonly used simulated annealing (SA) and GA, finding that HE-GA demonstrates higher accuracy, better stability, and faster computation. Using HE-GA under discrete scanning, we analyze tumor cases under different scanning dead times and observe that optimizing the total scanning time by reducing the scanning dead time can lead to improvements. This enables repetitive scanning with the same duration as the zigzag scanning pattern, providing better protection for patients' critical organs. © 2023 IEEE.

关键词： Genetic algorithms

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Fusion power supply advances by the J-TEXT engineering team

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Plasma Science and technology 2022年第12期24卷 85-100页

作者： Ming ZHANG Hongqi ZHANG Rumeng WANG Xiaohan XIE Wenshan WANG Yixing JIANG Zhiheng LI Peilong ZHANG Liye WANG Shaoxiang MA Yong YANG Wei ZHENG Bo RAO International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

To meet the stringent requirements of the fusion power supply for large-scale fusion devices,the J-TEXT engineering team has carried out key technology research and applications in several important directions of fusion power *** article presents the advances made by the J-TEXT engineering team in recent years in the following areas:(1) a high-voltage power supply for an auxiliary heating system;(2) a breakdown protection device for an auxiliary heating power supply;(3) magnetic field compatibility;(4) a high-voltage pulsed power supply for a fieldreversed configuration;(5) a large physics experimental facility control *** research backgrounds,technical progress,test results,applications,summaries and prospects are described in detail in each *** innovative research results and valuable engineering experience can promote the progress of fusion power supply technology,and also lay a foundation for the development of power supplies with higher parameters in the future.

关键词： high-voltage DC power supply breakdown protection magnetic field compatibility high-voltage pulsed power supply control system

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Design of a Dynamic Ridge Filter for Shortening Beam Delivery Time: A Simulation Study 4

Design of a Dynamic Ridge Filter for Shortening Beam Deliver...

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4th IEEE China International Youth Conference on Electrical engineering, CIYCEE 2023

作者： Yu, Benzhaoxia Liu, Xu Wang, Wei Qin, Bin Huazhong University of Science and Technology School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798350305562

Shortening the delivery time for proton therapy can improve the treatment efficiency and efficacy. Energy layer switching time (ELST) is the main contributor to the delivery time. In this study, we design a general dynamic ridge filter (D-RiFi) to broaden the width of the pristine Bragg peak, which can significantly reduce the number of energy layers and the treatment time. By optimizing the shape of D-RiFi, the maximum width of the Bragg peak can be extended to 3.16 cm with a dose flatness of 2.3%. The placement of D-RiFi also influences the beam size and lateral dose uniformity at the isocenter. According to the result of the Monte Carlo simulation, the D-RiFi should be placed 50cm away from the isocenter to satisfy the clinical dose uniformity of 2.5%. Furthermore, the hybrid broadening of the D-RiFi is proposed to reduce the number of energy while reducing the distal falloff width (DFW). The number of energy layers can be reduced by 76.19 % from 21 to 5 with the DFW of 0.54cm, which is conducive to realizing fast proton therapy and some advanced motion-control techniques (e.g., volume repainting, real-time tumor tracking). © 2023 IEEE.

关键词： Proton beams

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The effect of room temperature magnetic field on photoluminescence of Mn:CsPbBr_(3) quantum dots prepared by one-pot method in air

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Nano Research 2025年第4期18卷 561-568页

作者： Mengwei Chen Chenguang Shen Wei Huang Yingping Yang Jie Shen Department of Physics School of Physics and MechanicsWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic *** this work,a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr_(3) perovskite quantum dots in air with particle sizes of 7−8 *** effects of Mn doping on the structure,optical and magnetic properties of CsPbBr_(3) quantum dots were *** findings demonstrated proper Mn doping improved the crystallinity and photoluminescence(PL)of quantum *** prepared quantum dots have a narrow full width at half maximum emission(FWHM)of about 17−20 *** magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were *** results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr_(3) quantum *** with magnetic elements makes CsPbBr_(3) quantum dots more responsive to the applied magnetic *** at a lower 50 mT magnetic field,the PL peak of Mn:CsPbBr_(3) still declined 5.91%.Mn:CsPbBr_(3) quantum dots are a new type of multifunctional material that is beneficial to spintronics *** work demonstrates a low-cost synthesis *** should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.

关键词： CsPbBr_(3)quantum dots Mn doping one-pot method ferromagnetism magnetic field

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Multi-scale regulation in S,N co-incorporated carbon encapsulated Fe-doped CO_(9)S_(8) achieving efficient water oxidation with low overpotential

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Nano Research 2022年第2期15卷 872-880页

作者： Wenbin Wang Yang Yang Yang Zhao Shuzhe Wang Xiaomeng Ai Jiakun Fang Youwen Liu State Key Laboratory of Materials Processing and Die&Mould Technology and School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Lab of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Sulfide compounds provide a type of promising alternative for oxygen evolution reaction(OER)electrocatalysts due to their diversity,intrinsic activities,low-price and ***,the unsmooth mass transport channel,the collapse of the structure and insufficient intrinsic activities limit their potential for OER *** respond,the dense Fe-doped Co_(9)S_(8) nanoparticles encapsulated by S,N co-incorporated carbon nanosheets(Fe-Co_(9)S_(8)@SNC)were proposed and synthesized via fast thermal treatment from ultrathin metal-organic frameworks(MOFs)*** designed catalysts,the nanosheet configuration connected by nanoparticles retained rich access for permeation of electrolyte and precipitation of O_(2) bubbles during OER ***,the outer carbon layer of Co9S8 provided additional catalytic activity while acting as armor to keep the structure *** the atomic scale,the doped Fe regulated the local charge density and the d-band center for facilitating desorption of oxygen *** from this multi-scale regulation strategy,the Fe-Co_(9)S_(8)@SNC displays an ultralow overpotential of 273 mV at 10 mA·cm^(-2) and small Tafel slope of 55.8 mV·dec^(-1),which is even close to the benchmark RuO_(2) *** concept could provide valuable insights into the design of other catalysts for OER and beyond.

关键词： Co9S8 water oxidation electronic structure multi-scale regulation d-band center

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A Symmetrical-Structure Fault Current Limiter for Bipolar DC Distribution Networks

A Symmetrical-Structure Fault Current Limiter for Bipolar DC...

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2023 IEEE PELS Students and Young Professionals Symposium, SYPS 2023

作者： Chen, Yangfan Zhang, Yu Huazhong University of Science and Technology State Key of Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Energering Wuhan China

ISBN: (纸本)9798350307832

In a bipolar DC distribution network, both the pole-to-ground fault (PGF) and the pole-to-pole fault (PPF) would threaten its security and stability. This paper proposes a symmetrical-structure fault current limiter (SSFCL) topology, which can help achieve fault riding through (FRT) of PGF and PPF in a bipolar DC distribution network. With the SSFCL, the rising speed of the fault current can be limited, thus ensuring the safety of the DC transformers (DCTs). Then the fault current can be hysteresis controlled within a required range, which provides an adequate fault criterion to locate the faulty load branch. The discharging path of the SSFCL can create a fault current zero point, enabling the solid-state switches to achieve zero-current switching (ZCS) when cleaning the faulty branch. In addition, with the SSFCL, the terminal voltages of the DCTs would not decay during the FRT process, which ensures the fast restoration of the power supply after the fault has been cleaned. The effectiveness of the SSFCL is verified on a ± 375 V bipolar DC experimental prototype. The SSFCL presented in this article provides a solution for the DC fault in a bipolar DC distribution network. © 2023 IEEE.

关键词： DC transformers

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Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

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Plasma Science and technology 2022年第6期24卷 196-205页

作者： Wenting WENG Donghui XIA Yizhe TIAN Xixuan CHEN Zhijiang WANG Yuan PAN The International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

Power measurement is necessary for an electron cyclotron resonance heating(ECRH)*** directional coupler method has been put forward to monitor high-power microwave from gyrotrons in real time.A multi-hole directional coupler has been designed and manufactured for the 105 GHz/500 kW ECRH system on the J-TEXT *** the design process,we established the relationships between hole parameters and coupling characteristics based on the multi-hole coupling method and small-hole coupling ***-power tests have been carried *** results indicated the reasonability of the theoretical design and practicality of the fabricated directional *** of test errors have been discussed in detail,and the influences of spurious modes on the directional couplers have been emphatically analyzed.

关键词： directional couplers power measurement ECRH system

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