作者： Zou, Dengpeng;Yang, Bin;Li, Yuehua;Zhang, Xiaozhi;Pang, Lihui

期刊： IEEE Sensors Journal,2023年23(3):2783-2793 ISSN：1530-437X

通讯作者： Yang, Bin(yangbin01420@163.com)

作者机构： [Li, Yuehua; Zhang, Xiaozhi; Zou, Dengpeng; Yang, Bin; Pang, Lihui] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.

关键词： Gradient guided filter (GF);local gradient weight;multiscale decomposition (MSD);visible (VS) and near-infrared (NIR) image fusion

摘要： The visible (VS) and near-infrared (NIR) image fusion is a common approach to improve image visibility, which saves rich scene details and similar colors to the VS image in fused image. However, preserving edge details and preventing color distortion is a fundamental yet challenging problem for VS-NIR fusion work. To address this problem, this article proposes a novel image fusion method based on multiscale gradient guided edge-smoothing (MGES) model and local gradient weight. According to the spectrum characteristics of VS and NIR, the local gradient weight is established by analyzing the local gradient difference of VS and NIR, aiming to only transfer the prominent details of NIR image to VS image, thereby avoiding the confusion of spectral information. Furthermore, the MGES model is designed to simultaneously generate a Laplacian pyramid and a gradient domain guided filtering-based weight pyramid, which fully considers the gradient correlation between neighboring pixels and omits the Gaussian filtering step, thus effectively preserving spatial details and suppressing halo artifacts. Subjective and objective experimental results demonstrate the superiority of the proposed method over state-of-the-art methods in terms of preserving edge details and maintaining color naturalness. © 2001-2012 IEEE.

语种： 英文

作者： Guo, Kaiqi;Gao, Song;Li, Yang;Yin, Junli;Yue, Wenjing;...

期刊： Chemical Engineering Journal,2023年461:141970 ISSN：1385-8947

通讯作者： Li, Yang(yang.li@sdu.edu.cn)

作者机构： [Liu, Jianwen; Wu, Shixiang; Guo, Kaiqi; Zhang, Chunwei; Li, Shouliang; Yue, Wenjing; Li, Yang; Gao, Song; Kan, Hao] Univ Jinan, Sch Informat Sci & Engn, Jinan 250022, Peoples R China.;[Yin, Junli] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.;[Zhao, Songfang] Univ Jinan, Sch Mat Sci & Engn, Jinan 250022, Peoples R China.;[Li, Yang] Shandong Univ, Sch Microelect, Jinan 250101, Peoples R China.

通讯机构： [Yang Li; Hao Kan] S;[Junli Yin] H;Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, Hengyang 421001, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan 250022, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan 250022, China<&wdkj&>School of Microelectronics, Shandong University, Jinan 250101, China

关键词： Multifunctional flexible sensor;Pressure sensing;Humidity sensing;Intelligent sensing;Robot safety warning

摘要： As an ideal candidate to imitate the perception of human-skin, multifunctional electronic skin (e-skin) has attracted remarkable attention, which has promising applications in industrial robots, intelligent prosthetics and medical monitoring. Herein, we propose a dual-functional flexible sensor with common electrode for advanced pressure-humidity sensing, which is structured by Poly(vinylidenefluoride-cotrifluoroethylene) nanofiber composites based multilayer films. Benefiting from the common use of the interdigital electrode, the structure and external circuit of the proposed flexible sensor are simplified and the crosstalk could be effectively prevented to realize independent sensing. The flexible sensor not only demonstrates excellent pressure sensing performance including high sensitivity, long stability and fairly good ohmic contact, but also exhibits fast response/recovery time, small hysteresis and outstanding long-term stability in humidity sensing, showing excellent potential applications in real-time monitoring of human physiological information. Additionally, based on its excellent performances, an advanced wearable gesture monitoring system for real-time display and an intelligent safety monitoring system to achieve dual-risk avoidance of contact (pressure) and non-contact (humidity) is realized. This work provides a feasible strategy for designing a high performance dual-functional flexible sensor without interference, and presents a roadmap on constructing practical e-skin system in dynamic detection of gestures and better human-robot collaboration. © 2023 Elsevier B.V.

语种： 英文

作者： Guiping Cui;Lei Jia;Xing Qu

期刊： Journal of Physics: Conference Series,2023年2564(1):012020 ISSN：1742-6588

作者机构： [Guiping Cui; Lei Jia; Xing Qu] School of Electrical Engineering, University of South China, Hunan, Hengyang, China

摘要： <jats:title>Abstract</jats:title> <jats:p>The electrified railway has power quality problems such as three phases seriously unbalanced, large harmonics, and reactive power. In addition, the neutral section exists at each power supply section, which restricts the development of the high-speed and heavy-haul railway. This paper proposes a novel co-phase traction power supply system (TPSS) based on a YNvd balanced transformer, which can not only solve the above problems but also save one single-phase coupling step-down transformer, thus reducing the cost and space of the whole system. In addition, the voltage level of the converter switching device can be reduced by the rational design of the transformer tap position, which enhances the reliability and feasibility of the system. The compensation principle and control strategy of the co-phase TPSS based on the novel YNvd balanced transformer are analyzed in detail in this paper, and the compensation current detection and integrated power flow controller (IPFC) control methods are given. Simulation and analysis show that the proposed topology structure and control method are correct and feasible.</jats:p>

语种： 英文

作者： Deng, Jian;Lei, Jieheng;Wang, Guolong;Zhong, Lin;Zhao, Mu;...

期刊： Materials,2023年16(10):3834- ISSN：1996-1944

通讯作者： Lei, ZY

作者机构： [Lei, Zeyong; Deng, Jian; Lei, ZY; Zhong, Lin] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wang, Guolong; Deng, Jian] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Lei, Jieheng] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Mu] China Nucl Ind 24 Construct Co Ltd, Beijing 102400, Peoples R China.

通讯机构： [Lei, ZY ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.

关键词： Austenitic stainless steel;Glow discharges;Inductively coupled plasma;Ion exchange;Ions;Iron compounds;Nuclear fuels;Nuclear power plants;Optical emission spectroscopy;Pressurized water reactors;Scanning electron microscopy;Steel corrosion;X ray photoelectron spectroscopy;304 stainless steel;Cobalt deposition;Cobalt ion;Corrosion products;Experimental investigations;High-temperature water;Pressurised water reactor;Primary loop;Spinel;Stainless steel surface;Deposition

摘要： The radioactive corrosion products 58Co and 60Co in the primary loops of pressurized water reactors (PWRs) are the main sources of radiation doses to which workers in nuclear power plants are exposed. To understand cobalt deposition on 304 stainless steel (304SS), which is the main structural material used in the primary loop, the microstructural characteristics and chemical composition of a 304SS surface layer immersed for 240 h in borated and lithiated high-temperature water containing cobalt were investigated with scanning electron microscopy (SEM), X-ray diffraction (XRD), laser Raman spectroscopy (LRS), X-ray photoelectron spectroscopy (XPS), glow discharge optical emission spectrometry (GD-OES), and inductively coupled plasma emission mass spectrometry (ICP-MS). The results showed that two distinct cobalt deposition layers (an outer layer of CoFe2O4 and an inner layer of CoCr2O4) were formed on the 304SS after 240 h of immersion. Further research showed that CoFe2O4 was formed on the metal surface by coprecipitation of the iron preferentially dissolved from the 304SS surface with cobalt ions from the solution. The CoCr2O4 was formed by ion exchange between the cobalt ions entering the metal inner oxide layer and (Fe, Ni) Cr2O4. These results are useful in understanding cobalt deposition on 304SS and have a certain reference value for exploring the deposition behavior and mechanism of radionuclide cobalt on 304SS in the PWR primary loop water environment. © 2023 by the authors.

语种： 英文

作者： Yang, Wenjun;Li, Guoqiang;Gao, Xiang;Gong, Xueyu

期刊： Fusion Science and Technology,2023年79(5):528-536 ISSN：1536-1055

通讯作者： Gong, Xueyu(gongxueyu@126.com)

作者机构： [Yang, Wenjun] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Li, Guoqiang; Gao, Xiang] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China.;[Gong, Xueyu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Xueyu Gong] U;University of South China, School of Nuclear Science and Technology, Hengyang, Hunan421001, China

关键词： Alfvén eigenmode;EAST;fast ion;NOVA/NOVA-K

摘要： The stability of Alfvén eigenmodes (AEs) driven by fast ions is investigated in the Experimental Advanced Superconducting Tokamak (EAST). It is demonstrated that all AEs found in toroidal AE gaps are stable and that the least stable mode is a reversed shear Alfvén eigenmode (RSAE) with (Formula presented.). The calculation results show that collisional damping is the main damping mechanism for toroidal mode number (Formula presented.). The excitation threshold for the RSAE is about β crit,b = 3.33%, bigger than the value of the central beam ion beta β b = 1.01%. The results show that AEs driven by fast ions are stable in EAST, at least for the parameters shown in this work. The effect of beam ion pressure and energy on AE stability is also presented. The drive coming from fast ions increases with the pressure gradient, and the drive mainly comes from (Formula presented.) 3 resonance. © 2023 American Nuclear Society.

语种： 英文

作者： Tang, Dongbao;Duan, Ziwei;Liu, Luxuan;Jia, Zhaoyuan;Lang, Lijun;...

期刊： Micromachines,2023年14(10):1968- ISSN：2072-666X

通讯作者： Tan, YY

作者机构： [Liu, Luxuan; Tang, Dongbao; Jia, Zhaoyuan; Tan, Yuyu] Univ South China, Sch Elect Engn, Ultrafast Micronano Technol & Adv Laser Mfg Key La, Hengyang 421001, Peoples R China.;[Duan, Ziwei] Sun Yat Sen Univ, Sch Biomed Engn, Shenzhen Campus, Shenzhen 518107, Peoples R China.;[Lang, Lijun] Chinese Univ Hong Kong, Dept Comp Sci & Engn, Ho Sin Hang Engn Bldg, Hong Kong 999077, Peoples R China.

通讯机构： [Tan, YY ] U;Univ South China, Sch Elect Engn, Ultrafast Micronano Technol & Adv Laser Mfg Key La, Hengyang 421001, Peoples R China.

关键词： Blood;Centrifugation;Polystyrenes;Rope;Blood separation;Design and application;Electricity-free;Hand-powered;High costs;Medical conditions;Performance factors;Portable centrifuge;Spinning tops;Top-inspired;Centrifuges

摘要： Traditional centrifuges, extensively employed in biology, chemistry, medicine, and other domains for tasks such as blood separation and pathogen extraction, have certain limitations. Their high cost, substantial size, and reliance on electricity restrict their range of application. Contemporary centrifuges, inspired by everyday items like paper trays and egg beaters, boast characteristics such as ease of operation, independence from electricity, and portability. These features offer unique advantages in specific situations, such as electricity shortages, inadequate infrastructure, and challenging medical conditions. Consequently, we designed a hand-powered portable centrifuge driven by pulling a rope. Our experiments revealed significant performance factors, including load capacity, rope length, and frequency of rope pulling. The results demonstrated that the revolutions per minute (RPM) of a hand-powered portable centrifuge were directly proportional to the length of the rope and the frequency of pulling, up to a certain limit, while inversely proportional to the load. When used for separating and washing polystyrene microspheres, the portable centrifuge’s performance equaled that of traditional centrifuges. According to relevant calculations, this centrifuge could be capable of meeting the application of blood separation. Therefore, we believe this portable centrifuge will find meaningful applications in similar areas, particularly in resource-poor settings. © 2023 by the authors.

语种： 英文

作者： Haowen Tang;Lihong Zhao

期刊： Proceedings of SPIE - The International Society for Optical Engineering,2023年12919:64 ISSN：0277-786X

通讯作者： Zhao, Lihong(1776835667@qq.com)

作者机构： [Haowen Tang; Lihong Zhao] School of Electrical Engineering, University of South China, Hengyang, China

摘要： This study presents the design of an eddy current sensor for accurately measuring the insulation thickness of steel strip armored cables. The sensor utilizes the LDC1612 technology and operates on a non-contact measurement principle, eliminating potential measurement errors associated with contact sensors due to wear and tear. By integrating a laser distance meter, the system achieves precise measurements while ensuring the integrity of the cable insulation. This paper provides a comprehensive description of the sensor's design concept and implementation process, covering coil design, signal circuitry, and practical measurement techniques. To enhance measurement accuracy, a multi-point calibration method is employed, and the system's stability and reliability are experimentally validated. The results demonstrate that the designed LDC1612-based eddy current sensor exhibits excellent precision in measuring the distance between steel cables and steel strips, offering reliable performance. Hence, this design holds significant practical value and promising prospects for wider adoption. © 2023 SPIE · 0277-786X ·

语种： 英文

作者： Zhou, Zixuan;Guo, Kaiqi;Yin, Feifei;Yue, Wenjing;Li, Yang;...

期刊： Composites Science and Technology,2023年238:110012 ISSN：0266-3538

通讯作者： Li, Yang(yang.li@sdu.edu.cn);Yue, Wenjing(ise_yuewj@ujn.edu.cn);Yin, Junli(yinjunli@usc.edu.cn)

作者机构： [Guo, Kaiqi; Yin, Feifei; Yue, Wenjing; Zhou, Zixuan; Li, Yang] Univ Jinan, Sch Informat Sci & Engn, Jinan 250022, Peoples R China.;[Guo, Kaiqi; Yue, Wenjing; Zhou, Zixuan; Li, Yang] Univ Jinan, Shandong Prov Key Lab Network Based Intelligent Co, Jinan 250022, Peoples R China.;[Li, Yang] Shandong Univ, Sch Microelect, Jinan 250100, Peoples R China.;[Yin, Junli] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.

通讯机构： [Wenjing Yue; Yang Li] S;School of Information Science and Engineering, University of Jinan, Jinan, 250022, China<&wdkj&>Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan, 250022, China<&wdkj&>School of Information Science and Engineering, University of Jinan, Jinan, 250022, China<&wdkj&>Shandong Provincial Key Laboratory of Network Based Intelligent Computing, University of Jinan, Jinan, 250022, China<&wdkj&>School of Microelectronics, Shandong University, Jinan, 250100, China

关键词： Health monitoring;Multifunctional flexible sensor;Nanofiber;Pressure sensing;Temperature sensing

摘要： Flexible multifunctional sensor with excellent performance via unsophisticated fabrication method is impera-tively anticipated for the development of smart human health monitoring systems and wearable electronic de-vices. Here, we report a multilayer dual-mode flexible sensor (DMFS) by integrating different sensing layers on the two sides of a flexible dielectric substrate for sensing pressure and temperature. The introduction of elastic nanofiber skeleton structure and internal "sea urchin" like conductive materials is the top priority for the DMFS to have excellent sensing performance and durability. As a result, the fabricated DMFS ultimately shows excellent pressure sensitivity of 111.96 kPa-1 within a wide sensing range up to 70 kPa. In the case of temperature stimulus, the DMFS accomplishes a high, linear response to the ambient temperature variation within the range from 20 degrees C to 50 degrees C, while maintaining high stability and durability after long-term bending cycles. In addition, DMFS reveals its great potential for non-contact dynamic temperature measurement by being integrated into an intelligent temperature monitoring system. Most importantly, a novel smart human health-monitoring system, which attributes to the coordination and common work of multiple DMFS, has been developed and realizes simultaneous detection of multiple physiological signals of human beings in real-time.

语种： 英文

作者： Yao, Keguang;Long, Tiehan;Wang, Yajun;Yuan, Xiao-Zi;Yao, Yao*;...

期刊： Frontiers in Energy Research,2023年11:1200603 ISSN：2296-598X

通讯作者： Yao, Yao;Wang, HJ

作者机构： [Yao, Keguang] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China.;[Wang, Haijiang; Yao, Yao; Yao, Y; Wang, HJ; Yao, Keguang] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen, Guangdong, Peoples R China.;[Long, Tiehan] China Acad Aerosp Aerodynam, Beijing, Peoples R China.;[Wang, Yajun] Univ South China, Sch Elect Engn, Hengyang, Peoples R China.;[Yuan, Xiao-Zi] Energy Min & Environm Res Ctr, Natl Res Council Canada, Vancouver, BC, Canada.

通讯机构： [Yao, Y; Wang, HJ ] S;Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen, Guangdong, Peoples R China.;Southern Univ Sci & Technol, Key Lab Energy Convers & Storage Technol, Shenzhen, Peoples R China.

关键词： Proton exchange membrane fuel cells;Gas diffusion layer;Oxygen diffusion coefficients;landing;channel

摘要： Accurately predicting oxygen mass transport resistance and current distribution in fuel cells requires significant knowledge of oxygen diffusion coefficients in both in-plane and through-plane directions. However, there are few methods for measuring in-plane oxygen diffusion coefficients, which are important parameters for simulating oxygen flux distribution in gas diffusion layers (GDLs). In this study, we establish measurement methods and calculations for both in-plane and through-plane oxygen diffusion coefficients. Using in-house designed cells, we measure the in-plane and through-plane oxygen apparent diffusion coefficients of a commercial carbon paper (AvCarb EP40) at various torques and gas flow rates. We also simulate oxygen flux distributions in the GDL under each torque and gas flow rate. Our results show that the channel part is the major contributor to total oxygen flux at high torque conditions and that an increase in torque leads to a decrease in the contribution from the land part. Simulation results also suggest that a higher gas flow rate and lower torque contribute to a more uniform distribution of oxygen flux in the GDL. Copyright © 2023 Yao, Long, Wang, Yuan, Yao and Wang.

语种： 英文

作者： Liu, Yong;Hu, Ji-wen;Xie, Ya-qian

期刊： Proceedings of SPIE - The International Society for Optical Engineering,2023年12603:6 ISSN：0277-786X

通讯作者： Hu, JW

作者机构： [Liu, Yong] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.;[Hu, Ji-wen; Xie, Ya-qian; Liu, Yong] Univ South China, Coll Math & Phys, Hengyang 421001, Peoples R China.

通讯机构： [Hu, JW ] U;Univ South China, Coll Math & Phys, Hengyang 421001, Peoples R China.

会议名称： Conference on Biophysical-Society-of-GuangDong-Province-Academic-Forum - Precise Photons and Life Health (PPLH)

会议时间： DEC 09-11, 2022

会议地点： Guangzhou, PEOPLES R CHINA

会议主办单位： [Liu, Yong] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.^[Liu, Yong;Hu, Ji-wen;Xie, Ya-qian] Univ South China, Coll Math & Phys, Hengyang 421001, Peoples R China.

会议论文集名称： Proceedings of SPIE

关键词： Atherosclerosis;Electromagnetic wave;Ablation of heat;Finite element method

摘要： The purpose of this study is to explore the thermal damage of microwave to atherosclerotic plaques in order to achieve the purpose of treating atherosclerosis. In this paper, a fluid-solid-heat coupling model of thermal ablation of atherosclerotic plaque is established (The coupling model of blood-plaque-electromagnetic wave is studied in this paper, in which the thermal ablation of atherosclerotic plaque means that the electromagnetic wave is used to generate heat, and the temperature of atherosclerotic plaque tissue rises. If the cells in it reach the threshold of death temperature, they will be killed, so as to achieve the purpose of thermal ablation.). The electromagnetic field and bio-thermal equation are solved and analyzed by finite element method. By calculating the temperature and thermal damage distribution of microwave on atherosclerotic plaque, the effect of microwave on thermal ablation of atherosclerotic plaque was evaluated. The results show that the thermal damage degree of atherosclerotic plaque is positively correlated with electromagnetic wave frequency, electromagnetic wave power and heating time. The model shows that electromagnetic wave hyperthermia may provide a new therapeutic mode for thermal ablation of atherosclerotic plaques. © 2023 SPIE.

语种： 英文

作者： Can Liu;Jiwen Hu;Yaqian Xie;Yong Liu;Weirui Lei

期刊： Journal of Physics: Conference Series,2023年2535(1):012002 ISSN：1742-6588

通讯作者： Hu, Jiwen(hu_sanping@163.com)

作者机构： [Can Liu; Yong Liu] School of Electrical Engineering, University of South China, Hengyang;421001, China;[Jiwen Hu; Yaqian Xie; Weirui Lei] School of Mathematics and Physics, University of South China, Hengyang;[Can Liu; Jiwen Hu; Yaqian Xie; Yong Liu; Weirui Lei] 421001, China

摘要： <jats:title>Abstract</jats:title> <jats:p>Prediction of cavitation damage to the solid boundary is crucial in the application of ultrasound. The goal of this study is to investigate the potential for a cavitation bubble to cause mechanical effects on the curved elastic boundary and contribute to the understanding of the mechanisms of bubble-structure interaction. Effects of the surface curvature of the boundary are studied using the finite volume method. In the oscillatory migration of bubbles to the bottom of the boundary, there are several shape modes at the same time. The wall stress/deformation produced by impinging jets increases with parameter α. The bubble dynamic behaviors and the wall deformation have no significant effect as Young’s modulus equals or exceeds 60 MPa. Boundary deformation generated by tensile and compressive stresses during bubble collapse may be the basic mechanism of cavitation erosion. Due to the lack of visual observation and research on the acoustic cavitation effect, the key mechanism of ultrasonic cavitation is missing. Therefore, the importance of bubble dynamics and cavitation damage in this paper is self-evident</jats:p>

语种： 英文

作者： Yaoqiang Ma;Xueyu Gong

期刊： Proceedings of SPIE - The International Society for Optical Engineering,2023年12462:11 ISSN：0277-786X

作者机构： [Qiang, Ma Yao; Yu, Gong Xue] School of Electrical Engineering, University of South China, Hunan, Hengyang;421001, China;[Qiang, Ma Yao; Yu, Gong Xue] 421001, China

摘要： In this paper, under the background of big data era, the theory and operation methods of data analysis and visualization and their important value in the field of data science are described, and the relationship between them is necessary. Besides, the convenience and shortcomings of using python as a tool for data analysis are analyzed. Finally, the development trend of data analysis and visualization is prospected. © The Authors. Published under a Creative Commons Attribution CC-BY 3.0 License.

语种： 英文

作者： Huang, Jiahui;Liu, Jie*;Yang, Xiaohua;Ma, Jiayu;Liu, Hua

期刊： Frontiers in Energy Research,2023年10:1013255 ISSN：2296-598X

通讯作者： Liu, Jie;Yang, XH

作者机构： [Liu, Jie; Yang, Xiaohua; Huang, Jiahui; Ma, Jiayu] Univ South China, Sch Comp Sci, Hengyang, Hunan, Peoples R China.;[Liu, Hua] Univ South China, Sch Elect Engn, Hengyang, Hunan, Peoples R China.

通讯机构： [Yang, XH ; Liu, J] U;Univ South China, Sch Comp Sci, Hengyang, Hunan, Peoples R China.

关键词： compensation response;fault diagnosis;information flow;inverse response;SDG model

摘要： Accurate and complete diagnosis of nuclear accidents is the primary link to nuclear emergencies. The signed directed graph (SDG), as a common method of fault diagnosis, has good completeness. However, if there are feedforward and negative feedback control loops, compensation response and reverse response will be generated in the process of fault occurrence and propagation, which makes the state of the compensation variable and reverse variable uncertain, thus destroying the compatibility of the fault propagation path, leading to incomplete SDG reverse reasoning. In order to solve this problem, this paper proposes a SDG fault diagnosis method based on information flow. This method first finds out all the directed edges with the compensation variable or inverse variable node as the endpoint. By comparing the goodness of fit between the information flow on these directed edges and their total information flow curves, the path that contained the directed edge represented by sub-information flow with the highest (Formula presented.) is obtained, and it is used as the fault propagation path with the maximum probability to determine the state of the compensation variable or inverse variable and fault location. At the same time, this paper extends the SDG model from the structure to build an FR-SDG model that can intuitively describe the node steady-state information under the final response and the fault propagation path with the maximum probability, which improves the diagnosis resolution. Finally, this paper carried out the relevant experiments in the subsystem of the nuclear reactor primary loop by using the simulation system PCTran AP1000, which verified the feasibility of this method. Copyright © 2023 Huang, Liu, Yang, Ma and Liu.

语种： 英文

作者： Yan, Jiangyan*;Rong, Zhihai;Wang, Yajun*

期刊： International Journal of Hydrogen Energy,2022年47(5):3075-3086 ISSN：0360-3199

通讯作者： Yan, Jiangyan;Wang, Yajun

作者机构： [Yan, Jiangyan] Shenzhen Polytech, Sch Mech & Elect Engn, Shenzhen 518055, Peoples R China.;[Rong, Zhihai] Shenzhen Inst Informat Technol, Sch Software Engn, Shenzhen 518055, Peoples R China.;[Wang, Yajun] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.

通讯机构： [Yan, Jiangyan] S;[Wang, Yajun] U;Shenzhen Polytech, Sch Mech & Elect Engn, Shenzhen 518055, Peoples R China.;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.

关键词： Battery management systems;Charging (batteries);DC-DC converters;Energy efficiency;Energy management systems;Energy utilization;Hybrid systems;Regenerative braking;Roads and streets;Secondary batteries;3 levels;4-level;Battery exchanges;Battery systems;Cell/B.E;Dynamics characteristic;Energy-consumption;Fuel cell batteries;Pressure impact;Proton-exchange membranes fuel cells;Proton exchange membrane fuel cells (PEMFC)

摘要： A hybrid system with jointed battery and PEMFC is popular and of great potential in New Energy Vehicle (NEV) application. However, reliability and efficiency remain to be improved for commercial products. To reflect the complicated physics inside the proton exchange membrane fuel cell (PEMFC), the PEMFC model consisting of inner muti-physics process and other accessories was built, then a complete hybrid system was established when a matched battery, DC/DC, regenerative braking were taken into consideration. Based on the above model, the stack state and system performance under standard cycle for heavy duty vehicle-CWTVC were obtained. According to the simulation results, fuel cell states such as pressure, water content and voltage suffers severe oscillation with external load, especially in the highway cycle. Membrane electrode assembly (MEA) suffers from pressure impact with average value of more than 24 kPa in highway cycle. In the aspect of relative humidity, the PEMFC stack is most threatened in road cycle. As for the hybrid system, its efficiency and state of charge (SOC) fluctuation perform worst in urban cycle and road cycle respectively, while its highest efficiency occurs in road test. Operating mode of fuel cell has influence on hybrid system. When 3-level mode of fuel cell output was applied, the efficiency increased to its peak value at medium level of 28 kW and then declined gradually. H2 consumption had an opposite trend compared to efficiency. In the aspect of battery SOC, it declines in operating process and its fluctuations decreases when medium level got bigger. The 3-level mode and 4-level mode were compared using this model. It can be concluded that although 3-level mode performs slightly better in hybrid system efficiency, H2 consumption, pressure impact, it does not have absolute advantage over 4-level mode in other indicators. © 2021 Hydrogen Energy Publications LLC

语种： 英文

作者： He, Hongyu;Liu, Yuan;Tan, Yuyu;Wang, Xinlin;Lin, Xinnan;...

期刊： Solid-State Electronics,2022年187:108206 ISSN：0038-1101

通讯作者： He, HY

作者机构： [He, Hongyu; Wang, Xinlin; Tan, Yuyu; He, HY] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[He, Hongyu; Zhang, Shengdong; He, HY; Lin, Xinnan] Peking Univ, Sch Elect & Comp Engn, Shenzhen Grad Sch, Shenzhen 518005, Peoples R China.;[He, Hongyu; Liu, Yuan; He, HY] Guangdong Univ Technol, Sch Automation, Guangzhou 510006, Peoples R China.

通讯机构： [He, HY ] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;Peking Univ, Sch Elect & Comp Engn, Shenzhen Grad Sch, Shenzhen 518005, Peoples R China.;Guangdong Univ Technol, Sch Automation, Guangzhou 510006, Peoples R China.

关键词： Drain current model;Temperature characteristics;Thin-film transistor (TFT);Trap states

摘要： A new analytical surface-potential-based drain current model is presented for the organic thin-film transistors (TFTs) when carriers are confined in two dimensions. Following the carrier multiple trapping and release (MTR) conduction theory, i.e., the assumption that the trapped carrier concentration is much higher than the free carrier concentration, the model is developed. The presented model can account for the linear regime and saturation regime by a single formulation. The calculated results of the presented model are verified by the available experimental drain current considering the temperature characteristics. Comparing with the previous model using the variable range hopping and percolation (VRH) conduction theory, although the presented model and the previous model are similar in mathematics, the presented model is more efficient to estimate the density of trap states for the organic TFTs. © 2021 Elsevier Ltd

语种： 英文

作者： He, Liang;Shen, Yongcai;Zhang, Hongming;Lyu, Bo;Bae, Cheonho;...

期刊： 等离子体科学与技术：英文版,2022年24(6):064003 ISSN：1009-0630

通讯作者： Zhang, Hongming(hmzhang@ipp.ac.cn);Lyu, Bo(blu@ipp.ac.cn)

作者机构： [Bin, Bin; Wan, Shunkuan; Fu, Jia; Wang, Fudi; He, Liang; Zhang, Hongming; Lyu, Bo; Li, Yichao; Bae, Cheonho] Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China.;[Bin, Bin; Wan, Shunkuan; He, Liang; Lyu, Bo; Li, Yichao] Univ Sci & Technol China, Hefei 230026, Peoples R China.;[Shen, Yongcai] Hefei Normal Univ, Sch Phys & Mat Engn, Hefei 230601, Peoples R China.;[Shen, Yongcai] Comprehens Natl Sci Ctr, Inst Energy, Hefei 230026, Peoples R China.;[Yin, Xianghui; Ji, Huajian] Univ South China, Sch Elect Engn, Hengyang 420001, Peoples R China.

通讯机构： [Hongming ZHANG; Bo LYU] I;Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China<&wdkj&>University of Science and Technology of China, Hefei 230026, People's Republic of China<&wdkj&>Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

关键词： impurity;measurement;vacuum-ultraviolet;spectrometer;EAST;divertor

摘要： The measurement of impurity distribution in the divertor region of tokamaks is key to studying edge impurity transport. Therefore, a space-resolved vacuum-ultraviolet (VUV) spectrometer is designed to measure impurity emission in the divertor region on EAST. For good spectral resolution, an eagle-type VUV spectrometer with 1 m long focal length with spherical holograph grating is used in the system. For light collection, a collimating mirror is installed between the EAST plasma and the VUV spectrometer to extend the observing range to cover the upper divertor region. Two types of detectors, i.e. a back-illuminated charge-coupled device detector and a photomultiplier-tube detector, are adopted for the spectral measurement and high-frequency intensity measurement for feedback control, respectively. The angle between the entrance and exit optical axis is fixed at 15°. The detector can be moved along the exit axis to maintain a good focusing position when the wavelength is scanned by rotating the grating. The profile of impurity emissions is projected through the space-resolved slit, which is set horizontally. The spectrometer is equipped with two gratings with 2400 grooves/mm and 2160 grooves/mm, respectively. The overall aberration of the system is reduced by accurate detector positioning. As a result, the total spectral broadening can be reduced to about 0.013 nm. The simulated performance of the system is found to satisfy the requirement of measurement of impurity emissions from the divertor area of the EAST tokamak.

语种： 英文

作者： Bing Shen;Yifa Sheng

期刊： Journal of Physics: Conference Series,2022年2378(1):012043 ISSN：1742-6588

作者机构： [Bing Shen; Yifa Sheng] School of Electrical Engineering, University of South China, Hunan, Hengyang;421001, China;[Bing Shen; Yifa Sheng] 421001, China

摘要： <jats:title>Abstract</jats:title> <jats:p>Modular Multilevel Converter (MMC) is widely used in flexible HVDC transmission systems, IGBT module as its core power device, its failure process seriously affects the operation reliability of MMC. The high junction temperature is an important reason for the failure of the IGBT module, so monitoring the junction temperature of IGBT module is an important means to ensure the stable operation of the system. According to the topological structure of IGBT module, the current junction temperature monitoring methods of IGBT module are summarized and compared. According to the shortcomings of the current research and the current research status, the research direction of IGBT module junction temperature monitoring is prospected.</jats:p>

语种： 英文

作者： Jiang, Shangting;Li, Ye;Chen, Zhiyong;Zhu, Weihua;Wu, Qinmao;...

期刊： AIP Advances,2022年12(6):065311 ISSN：2158-3226

通讯作者： Wang, XL

作者机构： [Li, Ye; Jiang, Shangting] Univ South China, Sch Nucl Sci & Technol, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.;[He, Hongyu; Wang, Xinlin] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Wang, XL ] U;Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.

摘要： With the first-principle method, we studied the effects of the type and position of defects on the defect formation energy, electronic band structure, and electron mobility of the 4-layer hexagonal system silicon carbon (4H-SiC). The vacancy defect formation energy is smaller than the interstitial defect formation energy. The C vacancy defect formation energy is the smallest, while the Si interstitial defect formation energy is the largest. The defect formation energy is little affected by the defect position. The electronic band structure shows semi-metallic property due to the vacancy defect and the interstitial defect, and it shows a smaller bandgap due to the antisite defect. The electronic band structure changes little while the defect position changes. The electron mobility is reduced in varying degrees according to different defect types. The electron mobility changes little while the defect position changes. © 2022 Author(s).

语种： 英文

作者： Haijing Liu;Fudi Wang;Jia Fu;Yifei Jin;Liang He;...

期刊： Proceedings of SPIE - The International Society for Optical Engineering,2022年12448:96 ISSN：0277-786X

通讯作者： Wang, Fudi(fdwang@ipp.ac.cn);Lyu, Bo(blu@ipp.ac.cn)

作者机构： [Haijing Liu; Xueyu Gong] School of Electrical Engineering, University of South China, 28 West Chang Sheng Road, Hunan, Hengyang;421001, China;[Fudi Wang; Jia Fu; Yifei Jin; Liang He; Dian Lu; Cheonho Bae; Hongming Zhang; Shengyu Fu; Huajian Ji; Bo Lyu] Institute of Plasma Physics, Chinese Academy of Sciences, 350 Shu Shan Lake Road, Anhui, Hefei;230031, China;[Yijun Zhong; Qianhong Huang; Sheng Deng] School of Nuclear Science and Technology, University of South China, 28 West Chang Sheng Road, Hunan, Hengyang

摘要： The Poloidal and Tangential X-ray imaging Crystal Spectrometers (PXCS and TXCS) were developed on Experimental Advanced Superconducting Tokamak (EAST) to provide spatially and temporally resolved plasmas ion temperature (Ti), electron temperature (Te) and rotation velocity (poloidal- and toroidal-, Vp and Vt) profiles. Each spectrometer consisted of a spherically curved crystal and a CMOS pixelated X-ray Detector. Both spectrometers have recently been upgraded to enhance their measurement capabilities and stabilities. A He-like argon crystal (2d=4.913Å) is deployed on the TXCS and a double-crystal assembly including a He-like argon (2d=4.913Å) crystal and a Ne-like xenon (2d=6.686Å) crystal is deployed on the PXCS. To obtain the optimal spatial resolution, the distance from the crystal to the detector and to the plasma center are modified. Meanwhile, the projection angle of the TXCS sightline to the major radial direction is increased from ~ 22.5ºto ~ 29.5ºin order to view the plasma with more tangential component. The XCS server is moved from the EAST tokamak hall to an outside lab to avoid harsh electromagnetic environment and thus enhance stability. Finally, the experimental results from the upgraded XCS systems are presented. New spectral lines of Zinc-like, Copper-like and Gallium-like tungsten are identified, which are diffracted by the He-like argon crystal. High-quality He-like argon and Ne-like xenon spectra are observed simultaneously on one detector for measurements of plasmas with wide temperature ranges. Comparison of the Ti- and Vt- profiles measured by TXCS with those measured by charge exchange recombination spectroscopy (CXRS) shows that the results are in well agreement, verifying the reliability of the upgrade of the spectrometers. © 2022 SPIE.

语种： 英文

作者： Yang, Puqiong;Liu, Bo;Jiang, Caichao*;Yang, Xin;Wei, Jianglong;...

期刊： IEEE Transactions on Plasma Science,2022年50(4):775-781 ISSN：0093-3813

通讯作者： Jiang, Caichao;Wei, JL

作者机构： [Yang, Puqiong] Southwest Inst Phys, Chengdu 610041, Peoples R China.;[Yang, Puqiong] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Yang, Xin; Hu, Chundong; Liang, Lizhen; Wei, Jianglong; Jiang, Caichao; Xie, Yahong; Liu, Bo; Jiang, CC; Xu, Yongjian; Zhao, Yuanzhe; Wang, Jinxin; Xie, Yuanlai] Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China.

通讯机构： [Jiang, CC; Wei, JL ] C;Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China.

关键词： Radio frequency;Plasmas;Plasma sources;Antennas;Particle beams;Discharges (electric);Artificial neural networks;Argon discharge;impedance matching;inductively coupled plasma;neutral beam injection;power coupling efficiency

摘要： To study the characteristics of radio frequency (RF) power coupling, RF plasma diagnostics, actively cooled tube, and negative ion production, a plasma source was designed as a small-scale test facility. The matching network was carefully designed and successfully applied to the 2-MHz RF plasma source. In this article, the design method of the matching unit will be presented; with the assistance of this matching unit, the RF plasma source was successfully lit and the reflected power was reduced to a very low level. A V-I probe was installed in front of or in the rear of the matching network, respectively, to in situ measure the RF voltage, current, and phase angle. The equivalent resistance of the RF plasma source was analyzed in detail. The RF power coupling efficiency was derived in two different methods, and the relationship between the coupling efficiency and the equivalent resistance of the plasma source is verified. At the same time, the equivalent resistance of the plasma source was also collected to optimize the matching unit. © 1973-2012 IEEE.

语种： 英文