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Estimation of magnetic island width by the fluctuations of electron cyclotron emission radiometer on J-TEXT

Plasma Science and technology 2019年第1期21卷 24-28页

作者： Bowen RUAN Zhoujun YANG Xiaoming PAN Hao ZHOU Fengqi CHANG Jing ZHOU 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

The width of a magnetic island is an important parameter for the quantitative analysis of magnetohydrodynamic-related physics. An electron cyclotron emission radiometer(ECE) is a powerful tool that can be used to obtain this width, which can usually be determined from the flat temperature distribution at the O-point phase or the maxima temperature perturbation. An improved method to estimate the width of a magnetic island is proposed in this paper, and it is independent of calibration. With this method and the existing 24-channel ECE system, the width of a rotation magnetic island can be estimated. Additionally, by filtering the fluctuation ECE signal, the evolution of the magnetic island can be obtained. The results of this method are consistent with those of the integrated magnetic probe signals, which represent the relative change of the magnetic island.

关键词： magnetic island width ECE relative temperature perturbation J-TEXT tokamak

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Experimental Studies of Electrostatic Fluctuations and Turbulent Transport in the Boundary of J-TEXT Tokamak Using Reciprocating Probe

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Plasma Science and technology 2012年第12期14卷 1041-1047页

作者： CHEN Zhipeng SUN Yue WANG Zhijiang YANG Zhoujun DING Yonghua ZHUANG Ge J-TEXT team State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Geospace Environment Chinese Academy of Sciences University of Science & Technology of China Hefei 230026 China

As the basic of a deeper investigation on the turbulent transport, the fluctuation property in the boundary of the newly-reconstructed Joint Texas Experimental Tokamak （J- TEXT） is studied experimentally using the reciprocating Langmuir four-tip probe, which has been built and operated as the primary diagnostic tool in the boundary of J-TEXT tokamak. In this paper, spatial profiles of the plasma-edge parameters are obtained, such as electron temperature, plasma density, plasma potential, poloidal electric field and their fluctuations. The results indicate the existence of a Er ×BT shear layer at the vicinity of last closed flux surface （LCFS）, with the fluctuations suppressed in varying degrees. The turbulence-induced particle and energy fluxes can be calculated by the local plasma parameters above. Convection dominates the cross-field turbulent transport in boundary plasma. Electrostatic fluctuations properties are also studied in detail with the help of numerical analysis. Statistical analysis on density fluctuation shows that, the intermittency can affect the turbulence in the scrape-off layer （SOL）.

关键词： electrostatic fluctuations anomalous transport J-TEXT reciprocating Lang- muir probe

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Beam dynamics simulations of the injector for a compact THz source

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Chinese Physics C 2014年第8期38卷 103-110页

作者：李骥裴元吉尚雷冯光耀胡桐宁陈曲珊李成龙 National Synchrotron Radiation Laboratory University of Science and Technology of China Deutsches Elektronen-Synchrotron State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Terahertz radiation has broad application prospects due to its ability to penetrate deep into many organic materials without the damage caused by ionizing radiations. A free electron laser （FEL）-based THz source is the best choice to produce high-power radiation. In this paper, a 14 MeV injector is introduced for generating high-quality beam for FEL, is composed of an EC-ITC RF gun, compensating coils and a travelling-wave structure. Beam dynamics simulations have been done with ASTRA code to verify the design and to optimize parameters. Simulations of the operating mode at 6 MeV have also been executed.

关键词： EC-ITC RF gun compensating coils travelling-wave structure start-to-end simulation

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Reliability criterion of film capacitor based on moisture diffusion in encapsulation

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High Voltage 2023年第6期8卷 1242-1252页

作者： Zheng Li Hua Li Tian Qiu Fuchang Lin Yucheng Wang School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Key Laboratory of Pulsed Power Technology Ministry of EducationWuhanChina

The current reliability criterion(RC)of the film capacitor(FC)is usually a fixed value,which does not consider the staged capacitance loss caused by moisture diffusion under high temperature and/or high *** expected lifetime of capacitors would deviate far from the actual *** moisture diffusion process of the encapsulated FC is ana-lysed based on Fick's second *** order to investigate the capacitance loss and moisture diffusion characteristics,4 types of film capacitors are stressed with AC voltage under different temperatures and *** on the staged analysis of the capacitance and weight gain curves,the effect of moisture diffusion on capacitance loss is *** indicate that the linear stage of capacitance loss corresponds to the Fickian moisture diffusion stage of weight *** effect of voltage on FC aging is the most *** capacitance loss rate increases by 301%when the voltage rises by 30%.An RC calculation method of the FC is further proposed,which could also screen the encap-sulation quality and shorten the aging test duration by at least 80%.

关键词： aging moisture diffusion

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Comparative high-pressure structural and electrical transport properties study of thermoelectric (Bi1−xSbx)2Te3 compounds

arXiv

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arXiv 2025年

作者： Wei, Chenxin Muhamed, Dawod Lu, Wenting Zou, Haikai Sun, Baihong Feng, Shiyu Zhang, Qian Su, Zegeng Kadobayashi, Hirokazu Kunz, Martin Wang, Bihang Ahmad, Azkar Saeed Amouya, Yaron Stavrou, Elissaios Materials Science and Engineering Department Guangdong Technion-Israel Institute of Technology Shantou515063 China Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel SPring-8/JASRI 1-1-1 Kouto Sayo-gun Hyogo679-5198 Japan Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Deutsches Elektronen-Synchrotron DESY HamburgD-22603 Germany Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion Guangdong Technion-Israel Institute of Technology State Shantou515063 China

Thermoelectric (Bi1−xSbx)2Te3 (BST-x) compounds with x=0.2, 0.7 and 0.9 have been studied using synchrotron angle-dispersive powder x-ray diffraction in a diamond anvil cell up to 25 GPa (at room temperature). The results clearly indicate that all compounds of this study follow a similar structural evolution with the one of pure Bi2Te3 and Sb2Te3 under pressure. From the comparison between the critical pressures of the corresponding phase transitions, a clear trend of increasing critical pressure for the transition to the disordered solid-solution BCC phase was observed with the increase of Sb concentration. In the case of the BST-0.7, an extended stability of the solid-solution BCC phase up to, at least, 180 GPa was observed. Finally, electrical transport properties measurements under pressure for BST-0.7, document a reversible pressure-induced metallization above 12 GPa. © 2025, CC BY.

关键词： Tellurium compounds

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Mitigation measures of the electric field in the medium-voltage power module:Effect of voltage types and recommendations for designers

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High Voltage 2021年第5期6卷 836-849页

作者： Zhizhao Huang Cai Chen Yong Kang Stig Munk-Nielsen Christian Uhrenfeldt State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhanChina Department of Energy Technology Aalborg UniversityAalborgDenmark

In the medium‐voltage silicon carbide device power module,the higher voltage level will induce higher electric field stress in critical internal points such as the edge of the conductor on the direct bonded copper(DBC)*** can lead to partial discharge and subsequently accelerated ageing of the insulating medium in the ***,it is important to reduce the high electric field ***,the related technical methods of electric field control are reviewed and compared by combining the ease of implementation in real power module and the field control *** addition,systematic explanations of the electric field drift and influencing factors of the electric field strength under different voltage types within different module structures are ***,for half‐bridge power modules with different substrates structures,sug-gestions on how to implement non‐linear field‐dependent materials to reduce the electric field strength are given.

关键词： power field measures

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Regulating electronic density and interfacial electric field of high-entropy metallenes to enhance oxygen reduction reaction activity

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Chem Catalysis 2025年

作者： Liu, Wenning An, Li Li, Pengfei Fu, Yajie Zhang, Xu Qu, Dan Liu, Yichang Hu, Pu Wang, Xiayan Jiang, Ning Sun, Zaicheng State Key Laboratory of Materials Low-Carbon Recycling Department of Chemistry Institute of Hydrogen Energy Daxing College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology 206 Guanggu 1st Road Wuhan 430205 China Beijing Taifeng Xianxing New Energy Technology Co. Ltd. Beijing 102200 China

High-entropy metallenes (HEMs), combining high-entropy alloys and ultrathin nanosheets, exhibit lattice strain, geometric effects, and electronic modulation, enhancing oxygen reduction reaction (ORR) activity. We propose a strategy to manipulate the interfacial electric field and electronic density of states in HEMs by adjusting atomic radius and electronegativity differences. Integrating smaller atomic radius elements (Fe/Co/Ni) with larger ones (Pt/Pd/Mo) increases nanosheet curvature, altering the local electric field. Low-electronegativity Fe/Co/Ni/Mo elements lower the d-band center of Pd, and Pt further decreases it, reducing oxygen intermediate adsorption energy. PtPdFeCoNiMo HEMs, with sub-nanometer thickness, high curvature, microstrain, and optimized electronic structure, achieve ORR mass activity of 1.40 A·mg_Pt⁻¹ at 0.9 V (vs. reversible hydrogen electrode [RHE]) in 0.1 M KOH, 21 times higher than Pt/C. They retain excellent performance after 20,000 cycles, with reduced energy barriers for the rate-determining ORR step. © 2025 Elsevier Inc.

关键词： atomic radius curvature d-band center electrocatalytic oxygen reduction reaction electronegativity electronic regulation high-entropy metallenes local electric field microstrain SDG7: Affordable and clean energy sub-nanometer thickness

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Study of the Characteristics and Suppression of EMI of Inverter with SiC and Si Devices

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Chinese Journal of Electrical engineering 2018年第3期4卷 37-46页

作者： Zhihao Fang Dong Jiang Yechi Zhang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The paper systematically studies the impacts of two major factors:device switching actions and inverter switching frequency on the whole EMI *** powerful experimental results of electromagnetic interference(EMI)in voltage source inverter(VSI)with SiC and Si devices are *** far as the influence of switching actions is concerned:faster switching speed will generate higher EMI noise levels in the high frequency range,and ringing in the device switching will also make the EMI noise near the ringing frequency range *** the meantime,increasing of the switching frequency of the inverter will result in a higher EMI noise peak for the whole EMI *** order to suppress the EMI noise of the converter to meet standards,Random PWM(RPWM)and EMI filters are *** RPWM,the EMI current can drop a few more dB than that with SVPWM,which makes the filter work ***,as extra attenuation can be provided,it provides the benefit of reducing the weight and volume of the inductor of the ***,the combination of an advanced modulation strategy and EMI filter is proposed for suppressing of EMI noise in an inverter.

关键词： Motor drive EMI SiC ringing EMI filter PWM

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Improved Hybrid Method to Calculate Inductances of Permanent Magnet Synchronous Machines with Skewed Stators Based on Winding Function Theory

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Chinese Journal of Electrical engineering 2016年第1期2卷 52-61页

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

An improved hybrid method combining two dimensional(2D)finite element analysis(FEA)and the analytical method is put forward to calculate the stator winding inductance and synchronous inductance influenced by stator skewing *** on winding function theory(WFT),the improved method proposes two factors to describe variable inductances along the stator skewing *** simulations are then performed on three interior permanent magnet synchronous machines(IPMSMs),one normal and two skewed machines(half slot and one slot pitch skewing respectively).Extensive experiments are conducted on relevant prototypes with good ***,analysis and comparisons are made as to the influence of different skewing angles on the inductances and torque-speed *** is found that Ld increases and Lq decreases by skewing,leading to the reduction of the rotor saliency and maximal torque capability,but increase of the flux weakening capability.

关键词： Finite element analysis(FEA) inductances permanent magnet synchronous machine(PMSM) skewing winding function theory(WFT).

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Low-carbon Operation of Combined Heat and Power Integrated Plants Based on Solar-assisted Carbon Capture

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1138-1151页

作者： Xusheng Guo Suhua Lou Yaowu Wu Yongcan Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China State Grid Sichuan Electric Power Research Institute Chengdu 610041China

Accelerating the development of renewable energy and reducing CO_(2)emissions have become a general consensus and concerted action of all countries in the world. The electric power industry, especially thermal power industry, is the main source for fossil energy consumption and CO_(2)emissions. Since solvent-based post-combustion carbon capture technology would bring massive extra energy consumption, the application of solar-assisted carbon capture technology has attracted extensive attention. Due to the important role of coal-fired combined heat and power plants for serving residential and industrial heating districts, in this paper, the low-carbon operation benefits of combined heat and power integrated plants based on solar-assisted carbon capture(CHPIP-SACC) are fully evaluated in heat and power integrated energy system with a high proportion of wind power. Based on the selected integration scheme, a linear operation model of CHPIP-SACC is developed considering energy flow characteristics and thermal coupling interaction of its internal modules. From the perspective of system-level operation optimization, the day-ahead economic dispatch problem based on a mix-integer linear programming model is presented to evaluate the low-carbon benefits of CHPIP-SACC during annual operation simulation. The numerical simulations on a modified IEEE 39-bus system demonstrate the effectiveness of CHPIP-SACC for reducing CO_(2)emissions as well as increasing the downward flexibility. The impact of different solar field areas and unit prices of coal on the low-carbon operation benefits of CHPIP-SACC is studied in the section of sensitivity analysis.

关键词： Solar-assisted carbon capture CO_(2)emission reduction combined heat and power integrated plant heat and power integrated energy system wind power

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