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Sterilization mechanism of helium/helium-oxygen atmospheric-pressure pulsed dielectric barrier discharge on membrane surface

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Plasma Science and technology 2022年第12期24卷 173-181页

作者： Xingyu CHEN Yuhan Li Mengqi LI Zilan XIONG State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People's Republic of China

Pulsed dielectric barrier discharge(PDBD) exhibits several applications in different fields;however,the interaction of its components with substances remains a key *** this study,we employed experimental and numerical modeling to investigate the interactions between different PDBD components and substances in pure helium and a helium-oxygen mixture.A membrane comprising a Staphylococcus aureus strain was utilized as the treatment object to demonstrate the trace actions of the evolutions and distributions of certain components on the surface of the *** results revealed that the shapes and sizes of the discharging area and inhibition zone differed between *** a pure helium condition,a discharge layer existed along the membrane surface,lying beside the main discharging channel within the electrode ***,an annulus inhibition zone was formed at the outer edge of the electrode in the pure helium group at 30 s and 1 min,and this zone extended to a solid circle at 2 min with a radius that was~50% larger than that of the electrode ***,the discharging channel and inhibition zone in the helium-oxygen mixture were constrained inside the electrode area without forming any annulus.A 2D symmetrical model was developed with COMSOL to simulate the spatiotemporal distributions of different particles over the membrane surface,and the result demonstrated that the main components,which formed the annulus inhibition zone under the pure helium condition,contributed to the high concentration of the He^(+)annulus that was formed at the outer edge of the ***,O^(+)and O_(2)^(+)were the main components that killed the bacteria under the helium-oxygen mixture *** results reveal that the homogenization treatment on a material surface via PDBD is closely related to the treatment time and working gas.

关键词： pulsed dielectric barrier discharge interaction mechanism numerical modeling spatiotemporal distribution of species treatment substance

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Supplementary Control for Mitigation of Successive Commutation Failures Considering the Influence of PLL Dynamics in LCC-HVDC Systems

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 872-879页

作者： Jun Lu Xiaoming Yuan Meiqing Zhang Jiabing Hu State Key Laboratory of Advanced Electromagnetic Engineering and Technology and the School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan430074China

Line commutated converter based high voltage direct current(LCC-HVDC)links are widely employed for long distance bulk power transmission and asynchronous alternating current(AC)grid ***,LCC-HVDC systems often suffer from commutation failures when AC voltage is distorted,oscillating or reduced by AC faults,which leads to overheating of converter valves and interruptions in transmitted *** of which can have an adverse impact on the safety and stability of the entire power *** paper proposes a supplementary control for mitigation of successive commutation failures on the basis of analyzing the influence of phase-locked loop(PLL)dynamics on the commutation *** analyzing the impact of PLL dynamics on the actual leading angle,it is found that changes in the AC voltage phase remarkably influence ***,the error between the AC voltage phase and PLL’s output angle is added to the output of the extinction angle or DC voltage control to mitigate the successive commutation failures of LCC-HVDC *** conducted on the CIGRE benchmark model in PSCAD/EMTDC validate the performance of the supplementary control,which effectively mitigates successive commutation failures.

关键词： Commutation failure dynamics LCC-HVDC mitigation PLL supplementary control

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The Power Supply System for the J-TEXT Poloidal Field

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Plasma Science and technology 2009年第1期11卷 100-103页

作者：张明庄革于克训邱胜顺潘垣 Key Lab of Fusion and Advanced Electromagnetic Technology of Ministry of Education College of Electrical and Electronic EngineeringHuazhong University of Science and Technology

Joint-TEXT （J-TEXT） is a medium-sized tokamak constructed at Huazhong University of Science and technology. At present, the poloidal field power supply consists of three subsystem sets, namely Ohmic heating field power supply, vertical field power supply, and horizontal field power supply. The structure and function of the poloidal field （PF） power supply as well as the updated control system of the power supply is described. The new scheme uses the realtime feedback control method for the poloidal field power supply. The experimental results show that the poloidal field energized by poloidal field power supply meets the J-TEXT operational requirement perfectly.

关键词： J-TEXT poloidal field power supply control

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Healing of the edge magnetic island in the island divertor configuration on J-TEXT

arXiv

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arXiv 2025年

作者： Hou, Zhangrong Zhou, Song Wang, Nengchao Ding, Yonghua Jiang, Zhonghe Liang, Yunfeng Ren, Zhengkang Mao, Feiyue Yang, Qinghu Wang, Jiaming Xu, Xin Yang, Yutong Hua, Jiankun Xuan, Zijian Zhao, Chuanxu Li, Yangbo Yu, Lei Xia, Donghui Chen, Zhipeng Yang, Zhoujun State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung—Plasmaphysik Jülich52425 Germany Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the island divertor configuration on the J-TEXT tokamak. Experimental results reveal that the size of the edge open magnetic island with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as island healing, occurs when ECRH with a power of 500~600 kW is deposited in the plasma core or when 250 kW of ECRH is deposited at r"# = 0.5 a, where a is the minor radius. The reduction of the island width makes the island divertor ineffective and transition into the limiter configuration. A model incorporating the influence of ECRH on the scrape-off layer (SOL) thermoelectric current is proposed to explain the observed changes in the edge magnetic topology of the island divertor configuration. These findings suggest that ECRH should be deposited at the plasma core with carefully controlled power to ensure the stable and compatible operation of ECRH and the island divertor configuration in tokamaks. The results can provide insights into achieving robust operation of an island divertor in tokamaks. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

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Centralized control of parallel connected power conditioning system in electric vehicle charge-discharge and storage integration station

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 269-276页

作者： Jiuqing CAI Changsong CHEN Peng LIU Shanxu DUAN State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina

This study presents a centralized control scheme that coordinates parallel operations of power conditioning system(PCS)for the grid interactions of electric vehicles(EVs)in EV charge-discharge and storage integration *** issues for the control and operation of PCS under various operation modes are discussed,including vehicle to grid(V2G)mode,stand-alone mode and seamless transfer *** intelligent multi-mode charge-discharge method is utilized for the V2G mode,and the parallel control method based on communication network is adopted for the standalone *** addition,a novel seamless transfer strategy is proposed,which is able to implement PCS transition between V2G mode and stand-alone *** detailed process of the seamless transfer between the two modes is *** results are presented to show the performance and feasibility of this strategy.

关键词： Centralized control Power conditioning system(PCS) Charge-discharge and storage integration station Vehicle to grid(V2G) Seamless transfer

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Unsupervised Feature Enrichment and Fidelity Preservation Learning Framework for Skeleton-based Action Recognition

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IEEE Transactions on Circuits and Systems for Video technology 2025年

作者： Li, Chuankun Li, Shuai Gao, Yanbo Gao, Xingyu Chen, Ping Li, Jian Li, Wanqing North University of China State Key Laboratory of Dynamic Testing Technology School of Information and Communication Engineering Taiyuan030051 China Shandong University School of Control Science and Engineering School of Software Jinan250100 China Chinese Academy of Sciences Institute of Microelectronics Beijing100029 China University of Wollongong Advanced Multimedia Research Lab WollongongNSW2522 Australia

Unsupervised skeleton-based action recognition has achieved remarkable progress recently. Existing unsupervised learning methods suffer from severe overfitting problem, and thus small networks are used, significantly reducing the representation capability. To address this problem, the overfitting mechanism behind the unsupervised learning for skeleton-based action recognition is first investigated. It is observed that skeleton is already a relatively high-level and low-dimension feature, but not in the same manifold as the features for action recognition. Simply applying the existing unsupervised learning method tends to produce features that discriminate the different samples rather than action classes, resulting in the overfitting problem. To address this problem, this paper proposes an Unsupervised spatial-temporal Feature Enrichment and Fidelity Preservation (U-FEFP) learning framework to generate rich distributed features that contain all the information of a skeleton sample. A spatial-temporal feature transformation subnetwork is developed using channel-wise topology refinement graph convolutional block and graph convolutional gated recurrent unit block as the basic feature extraction network. The unsupervised Bootstrap Your Own Latent-based learning is utilized to generate rich distributed features, and the unsupervised pretext task-based learning is employed to preserve the information contained in the skeleton. The two unsupervised learning ways are collaborated as U-FEFP to produce robust and discriminative representations. Experimental results on four widely used benchmarks, namely NTU-RGB+D-60, PKU-MMD, NTU-RGB+D-120 and UAV-Human dataset, demonstrate that the proposed U-FEFP obtains the best result compared with the state-of-the-art unsupervised learning methods. © 1991-2012 IEEE.

关键词： Convolution

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Ultrafast coherent phonon dynamics in the kagome magnet GdV6Sn6

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Physical Review B 2025年第5期111卷 054308-054308页

作者： Juntao Fu Yadong Han Yuting Wang Huangyu Wu Yunfang Yang Rongxiao Du Jianzhou Zhao Hang Zhang Junhong Yu State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and Technology Mianyang 621010 China Laboratory for Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900 China Co-Innovation Center for New Energetic Materials Southwest University of Science and Technology Mianyang 621010 China School of Science Southwest University of Science and Technology Mianyang 621010 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China

The kagome intermetallic compound RV6Sn6 (R=rare earth) not only supports unique lattice geometries and nontrivial topological band structures but also exhibits long-range magnetic order at low temperatures, providing an ideal platform for studying interactions among electrons, phonons, and magnetism. Phonons play a crucial role in the coupling between magnetic order and topological fermions, whose dynamics are essential for understanding the complex multiple degrees of freedom interaction in RV6Sn6. In this work we systematically investigate the temperature-dependent coherent phonon dynamics of GdV6Sn6, and two characteristic temperature points have been identified (i.e., Te at ∼100K and Tm at ∼5K). Specifically, we have observed the anomalous softening and suppressed decaying of the Ag4 phonon mode when approaching Te, which may result from the change of density of states near the Fermi surface, while around Tm, the hardening and accelerated decaying of the Ag4 phonon mode emerges since the buildup of magnetic order alters the phonon energy renormalization and opens an additional scattering channel.

关键词： Fermions

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CHANNEL ACCESS PROTOCOLS FOR KU-BAND VSAT NETWORKS - A COMPARATIVE-EVALUATION

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IEEE COMMUNICATIONS MAGAZINE 1988年第5期26卷 34-44页

作者： RAYCHAUDHURI, D JOSEPH, K State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

The performance of candidate protocols for first-generation Ku-band very small aperture terminal (VSAT) satellite networks is compared. The goal is to assist the process of selecting a protocol. The performance comparison is carried out over a range of possible traffic, channel and satellite parameters, leading to an understanding of the appropriate regime for each of the protocols under consideration. The protocols considered are unslotted Aloha, slotted Aloha, selective-reject (SRE) Aloha, and demand-assigned time-division multiple-access (TDMA) or DAMA.< >

关键词： Access protocols Satellite broadcasting Costs Satellite ground stations Artificial satellites Time division multiplexing Local area networks Apertures Wide area networks Power generation economics

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Model Predictive Direct Power Control of Grid-connected Converters Considering Unbalanced Filter Inductance and Grid Conditions

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1279-1288页

作者： Weichen Yang Shihong Miao Zhiwei Liu Ji Han Yulong Xiong Qingyu Tu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key LaboratorySchool of Electrical and Electronic EngineeringHuazhong University of Science and Technology

The grid-connected converter(GCC) is widely used as the interface between various distributed generations and the utility grid. To achieve precise power control for GCC, this paper presents a model predictive direct power control(MPDPC)with consideration of the unbalanced filter inductance and grid conditions. First, the characteristics of GCC with unbalanced filter inductance are analyzed and a modified voltage control function is derived. On this basis, to compensate for the power oscillation caused by unbalanced filter inductance, a novel power compensation method is proposed for MPDPC to eliminate the DC-side current ripple while maintaining sinusoidal grid current. Besides, to improve the control robustness against mismatched filter inductance, a filter inductance identification scheme is proposed. Through this scheme, the estimated value of filter inductance is updated in each control period and applied in the proposed MPDPC. Finally, simulation results in PSCAD/EMTDC confirm the validity of the proposed MPDPC and the filter inductance identification scheme.

关键词： Inductance identification grid-connected converter model predictive control power oscillation elimination unbalanced grid conditions

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electromagnetic interaction between local surface plasmon polaritons and an atmospheric surface wave plasma jet

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Chinese Physics B 2014年第3期23卷 404-411页

作者：陈兆权胡东刘明海夏广庆郑晓亮胡业林叶秋波陈明功祝龙记胡希伟 College of Electrical & Information Engineering Anhui University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology State Key Laboratory of Structure Analysis for Industrial Equipment Dalian University of Technology

We analyze the electromagnetic interaction between local surface plasmon polaritons （SPPs） and an atmospheric surface wave plasma jet （ASWPJ） in combination with our designed discharge device. Before discharge, the excitation of the SPPs and the spatial distribution of the enhanced electric field are analyzed. During discharge, the critical breakdown electric field of the gases at atmospheric gas pressure and the surface wave of the SPPs converted into electron plasma waves at resonant points are studied. After discharge, the ionization development process of the ASWPJ is simulated using a two- dimensional fluid model. Our results suggest that the local enhanced electric field of SPPs is merely the precondition of gas breakdown, and the key mechanism in maintaining the discharge development of a low-power ASWPJ is the wave-mode conversion of the local enhanced electric field at the resonant point.

关键词： surface wave plasma surface plasmon polaritons numerical simulation electromagnetic interac-tion

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