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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhu, Bangyou Ma, Shaoxiang Guan, Shengyuan Zhang, Ming Yu, Kexun Pan, Yuan Zhao, Fang Huazhong University of Science and Technology School of Electrical and Electronic Engineering International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China State Grid Wuhan Power Supply Co. Ltd Wuhan China

ISBN: (纸本)9781728171494

To achieve controlled fusion, a variety of high voltage power supplies (HVPS) are vital for heating plasma to certain temperatures such as those in electron cyclotron resonance heating system (ECRH) and neutral beam injection (NBI) system. As a kind of HVPS widely used in fusion, presented article describes development, basic principles and current applications of pulse step modulation (PSM) based regulated high-voltage power supplies (RHVPS). A detailed study of important parameters and practical methods to improve its performance or address crucial issues of PSM based RHVPS are also shown in article. Various modulation discussed here, particularly, PSM shows great promising application in underwater acoustic transponder, high power motor driver etc. for its many advantages in inverter. © 2021 IEEE.

关键词： Cyclotrons

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Influence of Sintering Temperature on the Microstructure and Properties of ZnO Varistor Ceramics Prepared by Chemical Precipitation Method

Influence of Sintering Temperature on the Microstructure and...

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Power Systems and Electrical technology (PSET), IEEE International Conference on

作者： Siyuan Cheng Manling Dong Xi Shi Lei Guo Wei Yao Wei Wang Yunrui Ma State Grid Henan Electric Power Corporation Research Institute Zhengzhou China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

With the development of ZnO arresters towards high voltage gradient and miniaturization, more stringent requirements are put forward for ZnO varistor ceramics, and higher requirements are also placed on the uniformity of the distribution of added components in ZnO varistor ceramic powders. this paper, ZnO varistor powders were prepared by the chemical precipitation method, and ZnO varistor ceramics were prepared at different sintering The properties of the samples were analyzed by various characterization methods, and their microstructure and electrical properties were studied. The experimental findings indicate that the mean grain size of ZnO varistor ceramics become larger as the sintering temperature increases, and the grain boundary nonlinearity coefficient and potential barrier height first increase and then decrease. When the sintering temperature is 1050°C, the grain size of the ZnO varistor ceramic sample is better, the grain boundary barrier height is the highest, and the comprehensive electrical properties are better. Compared with the common 1100°C$\sim$1200°C in the literature, it not only reduces the energy consumption but also improves the performance of ZnO varistor ceramics. It is speculated that the uniform distribution of doping ions before sintering reduces the sintering temperature. The lower temperature reduces the volatilization of oxide additives such as bismuth oxide and avoids abnormal grain growth.

关键词： Varistors Temperature distribution Precipitation Powders II-VI semiconductor materials Sintering Zinc oxide

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3D-Printed Monolith Metallic Ni-Mo Electrodes for Ultrahigh Current Hydrogen Evolution

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Energy & Environmental Materials 2024年第5期7卷 224-233页

作者： Yanran Xun Hongmei Jin Yuemeng Li Shixiang Zhou Kaixi Zhang Xi Xu Win Jonhson Shuai Chang Teck Leong Tan Jun Ding Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore Institute of High Performance Computing(IHPC) Agency for ScienceTechnology and Research(A^(*)STAR)1 Fusionopolis Way#16-16 ConnexisSingapore 138632Singapore Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

In this work,we reported a series of monolithic 3D-printed Ni-Mo alloy electrodes for highly efficient water splitting at high current density(1500 mA cm^(-2))with excellent stability,which provides a solution to scale up Ni-Mo catalysts for HER to industry *** possible Ni-Mo metal/alloy phases were achieved by tuning the atomic composition and heat treatment procedure,and they were investigated through both experiment and simulation,and the optimal NiMo phase shows the best *** functional theory(DFT)calculations elucidate that the NiMo phase has the lowest H2O dissociation energy,which further explains the exceptional performance of *** addition,the microporosity was modulated via controlled thermal treatment,indicating that the 1100℃sintered sample has the best catalytic performance,which is attributed to the high electrochemically active surface area(ECSA).Finally,the four different macrostructures were achieved by 3D printing,and they further improved the catalytic *** gyroid structure exhibits the best catalytic performance of driving 500 mA cm^(-2)at a low overpotential of 228 mV and 1500 mA cm^(-2)at 325 mV,as it maximizes the efficient bubble removal from the electrode surface,which offers the great potential for high current density water splitting.

关键词： 3D-printed electrode Ni-Mo catalyst phase tuning ultra-high current density HER

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Surface modification of Poly-p-phenylene benzobisoxazole fiber by dielectric barrier discharge for magnet reinforcement

Surface modification of Poly-p-phenylene benzobisoxazole fib...

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China International Electrical and Energy Conference (CIEEC)

作者： Zilan Xiong Zhuocheng Song Kang Luo Mengqi Li Tao Peng Yiliang Lv State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan People's Republic of China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan People's Republic of China

At present, Poly-p-phenylene benzobisoxazole (PBO) fiber is one of the most preferred reinforcement materials for magnet. However, the poor interface performance between the PBO fiber and resin matrix has become the bottleneck of the pulse magnetic field intensity improvement. Surface modification of the PBO fiber may be an effective way to solve this problem. In this paper, PBO fibers were treated by atmospheric dielectric barrier discharge (DBD) in air under different treatment time. It is found that when the discharge power density remained unchanged at 8.49W/cm 2 , the optimal treatment time is 60s. In this case, the shear strength of PBO fiber-resin interface increases up to 52.77% compared with the untreated, while the tensile strength of fiber monofilament only decreases 4.73%. The plasma treatment results in a large number of deep pits and protrusions on the surface of PBO fibers and a significant increase in roughness. The relative content of C element on the surface of PBO fiber decreases significantly, the content of O element increases obviously, and the content of N element increases slightly. Polar groups -O-C=N- and -C=O- are introduced through grafting copolymerization reaction, which enhances the chemical activity and wettability of the fiber surface. All of these contribute to the interfacial shear strength increase between the PBO fiber and the resin.

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High-density/efficient surface active sites on modified separators to boost Li-S batteries via atomic Co^(3+)-Se termination

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Nano Research 2022年第8期15卷 7199-7208页

作者： Shujie Liu Xiaofei Liu Manfang Chen Dong Wang Xin Ge Wei Zhang Xiyang Wang Chunhui Wang Tingting Qin Haozhe Qin Liang Qiao Dan Zhang Xing Ou Weitao Zheng Key Laboratory of Automobile Materials of MOE School of Materials Science and Engineeringand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130013China Key Laboratory of Materials Design and Quantum Simulation College of ScienceChangchun UniversityChangchun 130022China National Base for International Science&Technology Cooperation School of ChemistryXiangtan UniversityXiangtan 411105China State Key Laboratory of Chem/Bio-Sensing and Chemometrics Advanced Catalytic Engineering Research Center of the Ministry of EducationCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooN2L 3G1Canada School of Metallurgy and Environment Central South UniversityChangsha 410083China

Various and critical electrocatalytic processes are involved during the redox reactions in the Li-S batteries,which extremely depend on the surface structure and chemical ***,single-atom concept unlocks a route to maximize the use of surface-active atoms,however,further increasing the density of active site is still strictly limited by the inherent structure that single-atoms are only highly-dispersed on ***,we provide a viewpoint that an elaborate facet design with singlecrystalline structure engineering can harvest high-density surface active sites,which can significantly boost the electrocatalyst performance for excellent Li-S ***,the single-crystal CoSe_(2)(scCS)exhibits three-types of terminated(011)facet,efficiently obtaining the surface with a high-rich Co^(3+)–Se bond termination,in contrast with lots of surface grain boundaries and dangling bonds in polycrystalline CoSe_(2).Surprisingly,the surface active sites concentration can reach more than 69%.As anticipated,it can provide high-density and high-efficient active sites,enormously suppressing the shuttle effect and improving the reaction kinetics via accelerating the conversion and deposition of polysulfides and *** surface lattice strategy with element terminated mode is a promising approach for designing electrocatalyst effect-based energy system,not merely for Li-S batteries.

关键词： high-density surface active sites Co^(3+)-Se covalent bond atomic element terminated Li-S batteries single-crystalline strategy

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Self-correction in protoacoustic range verification for different proton pulse widths

Self-correction in protoacoustic range verification for diff...

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2021 International Symposium on Biomedical engineering and Computational Biology, BECB 2021

作者： Li, Jiadong Tan, Ping Zhang, Lige State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China TRIUMF VancouverBCV6T 2A3 Canada

ISBN: (纸本)9781450384117

In proton therapy, the acoustic waves produced by the proton radiation can be measured to determine the proton range. The k-Wave MATLAB toolbox is used to simulate the propagation process of pressure waves in time and space. By measuring the time-of-flight (TOF) of the pressure wave, the Bragg peak distance is obtained. In this study, we obtain the error maps for different pulse widths, which show that angle is the influencing factor of protoacoustic TOF range calculations. To reduce the systematic errors, the angle θ (θ is the angle between the proton beam direction and the vector passing Bragg peak and the sensor) is mapped to the systematic error using a fifth-order polynomial to obtain the correction factor, . The presented simulations show that by correcting the distance with , the systematic error of protoacoustic range verification can be controlled within 1mm under different proton pulses widths. © 2021 ACM.

关键词： Systematic errors

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Assessment of Cao-Based Sorbent/Spinel Catalyst Composites for the Oxidative Dehydrogenation of Ethane in Isothermal In-Situ Co2 Capture and Utilization

SSRN

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SSRN 2023年

作者： Zhang, Xiaoyu Wei, Wei Ma, Jingran Zhang, Tiangang Wang, Yuan Sun, Haohan Wang, Feng Liu, Wenqiang State Key Laboratory of Coal Combustion School of Energy and Power Engineering Huazhong University of Science and Technology Wuhan430074 China China Energy Group Coal Coking Co. Ltd Wuhai016000 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China Huazhong University of Science and Technology China

In this study, a comparative analysis of the isothermal in-situ CO2 capture and utilization (ICCU) performance of MgB2O4 (B=Cr, Ga, Fe, Al)/CaCe15 was conducted. Results show that MgCr2O4/CaCe15 demonstrates exceptional performance, with CO2 uptake capacity, CO2 conversion, ethane conversion, ethylene selectivity, and ethylene yield after multiple cycles measuring at 0.22 g/g, 35.6%, 19.6%, 89%, and 17.4%, respectively. The dominant mechanism during the CO2 utilization stage was explored, and the coupling mechanism of catalytic dehydrogenation and reverse water-gas shift reaction is dominant, with abundant acid and basic sites within MgCr2O4/CaCe15 contributing to its outstanding performance. The reaction pathway during CO2 utilization was investigated, and results show that hydrogenation activation (CO2*+H*→HCOO*→CO*+OH*) is the primary pathway for CO2 dissociation, with the oxidative dehydrogenation of ethane mainly attributed to the activation of C-H on distinct C atoms, CH3CH3*→CH3CH2*→CH2CH2*. Meanwhile, the scission of the first C-H bond during CO2 utilization is the rate-determining step. Furthermore, we investigated the influencing factors and discovered that increasing the concentration of ethane and weight hourly space velocity both lead to a decrease in ethylene yield. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Small-Signal Stability of MMC Grid-Tied System under Two Typical Unbalanced Grid Conditions 4

Small-Signal Stability of MMC Grid-Tied System under Two Typ...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhu, Jianhang Hu, Jiabing Li, Yingbiao Ma, Shicong Wang, Tiezhu Institute of Artificial Intelligence Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China Electric Power Research Institute Power System Department China Beijing China

ISBN: (纸本)9781728171494

The AC transmission network of Modular Multilevel Converters (MMC) usually adapts the overhead line, so the single-phase grounding faults of the AC side are rather general. At this time, the protection system will cut off the fault line for the first time, so there are two unbalance grid conditions (UGCs), i.e. single-phase grounding (SGUGC) and disconnection (SDUGC) during this process. However, the comparative analysis of small-signal stability under two different UGCs has never been involved. Therefore, when ignoring the transient process of faults and protection actions, and considering the inherent properties of the MMC system, two small-signal models based on the linear time-periodic (LTP) theory are built under SGUGC and SDUGC, respectively. Then, the influence of control parameters on the system stability under the two UGCs is compared in detail, and the results provide theoretical support for the control parameters optimization after protection system action. Finally, the detailed nonlinear MMC grid-connected model verifies the analysis results. © 2021 IEEE.

关键词： Signal analysis

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Power dependence of density limit due to plasma-wall interaction in a burning plasma

arXiv

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arXiv 2025年

作者： Liu, Jiaxing Zhu, Ping Escande, Dominique Franck 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 Department of Nuclear Engineering and Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Aix-Marseille Université CNRS PIIM UMR 7345 Marseille France

The density limit is one of the major obstacles to achieving the desired fusion performance in tokamaks. However, the underlying physics mechanism for its recently observed power dependence in experiments has not been well understood or predicted in theory. In this work, the power dependent scalings of density limit are obtained based on the plasma-wall self-organization theory [D.F. Escande 2022 NF], which are able to match the power dependence of density limits in multiple tokamak devices. The key factors influencing the power dependence are found to be the plasma-wall sputtering and the particle confinement time. The effects of non-sputtered impurities and fusion products are further evaluated. This PWSO-density limit model is then extended to the burning plasma regime and used to predict the conditions for entering burning plasma. Copyright © 2025, The Authors. All rights reserved.

关键词： Tokamak devices

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Disruption Precursor Onset Time Study Based on Semi-supervised Anomaly Detection

arXiv

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arXiv 2023年

作者： Ai, Xinkun Zheng, Wei Zhang, Ming Chen, Dalong Shen, Chengshuo Guo, Bihao Xiao, Bingjia Zhong, Yu Wang, Nengchao Yang, Zhoujun Chen, Zhipeng Chen, Zhongyong Ding, Yonghua Pan, Yuan 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 Wuhan430074 China Institute of Plasma Physics Chinese Academy of Sciences Hefei230031 China

The full understanding of plasma disruption in tokamaks is currently lacking, and data-driven methods are extensively used for disruption prediction. However, most existing data-driven disruption predictors employ supervised learning techniques, which require labeled training data. The manual labeling of disruption precursors is a tedious and challenging task, as some precursors are difficult to accurately identify, limiting the potential of machine learning models. To address this issue, commonly used labeling methods assume that the precursor onset occurs at a fixed time before the disruption, which may not be consistent for different types of disruptions or even the same type of disruption, due to the different speeds at which plasma instabilities escalate. This leads to mislabeled samples and suboptimal performance of the supervised learning predictor. In this paper, we present a disruption prediction method based on anomaly detection that overcomes the drawbacks of unbalanced positive and negative data samples and inaccurately labeled disruption precursor samples. We demonstrate the effectiveness and reliability of anomaly detection predictors based on different algorithms on J-TEXT and EAST to evaluate the reliability of the precursor onset time inferred by the anomaly detection predictor. The precursor onset times inferred by these predictors reveal that the labeling methods have room for improvement as the onset times of different shots are not necessarily the same. Finally, we optimize precursor labeling using the onset times inferred by the anomaly detection predictor and test the optimized labels on supervised learning disruption predictors. The results on J-TEXT and EAST show that the models trained on the optimized labels outperform those trained on fixed onset time labels. Copyright © 2023, The Authors. All rights reserved.

关键词： Anomaly detection

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