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European Conference on Power Electronics and Applications

作者： Han Chen Lin Liang Ziyang Zhang State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Engineering Research Center of Power Safety and Efficiency Ministry of Education Huazhong University of Science and Technology Wuhan China

The Avalanche Bipolar Junction Transistor turns on in just a few hundred picoseconds. It plays an irreplaceable role in the field of fast pulses. The saturation characteristics of Marx circuits based on avalanche transistors are especially obvious. By analyzing the circuit principle, the saturation characteristics are influenced by the discharge capacitor and load resistance. The influence is studied in this paper by building simulation circuits in PSPICE. By using the voltage utilization to quantify the saturation characteristics and fitting the parameters from the simulation results, a general saturation formula is obtained. Subsequently, a ten-stage Marx circuit is built to verify the saturation characteristics.

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Carbonized waste milk powders as cathodes for stable lithium-sulfur batteries with ultra-large capacity and high initial coulombic efficiency

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Green Energy & Environment 2022年第5期7卷 1071-1083页

作者： Rabia Khatoon Sanam Attique Rumin Liu Sajid Rauf Nasir Ali Luhong Zhang Yu-Jia Zeng Yichuan Guo Yusuf Valentino Kaneti Jongbeom Na Haichao Tang Hongwen Chen Yang Tian Jianguo Lu State Key Laboratory of Silicon Materials Key Laboratory for Biomedical Engineering of Ministry of EducationSchool of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Institute for Composites Science Innovation School of Materials Science and EngineeringZhejiang UniversityHangzhou310027China Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials Faculty of Physics and Electronic ScienceHubei UniversityWuhanHubei430062China State Key Laboratory for Silicon Materials Key Laboratory of Quantum Technology and DevicesDepartment of PhysicsZhejiang UniversityHangzhou310027China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen518060China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1NamikiIbaraki305-0044Japan School of Chemical Engineering&Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandBrisbaneQLD4072Australia

To explore the natural resources as sustainable precursors offers a family of green *** use of bio-waste precursors especially the remaining from food processing is a scalable,highly abundant,and cost-effective *** waste materials is highly important especially for new materials discovery in emerging energy storage technologies such as lithium sulfur batteries(LSBs).Herein,waste milk powder is carbonized and constructed as the sulfur host with the hollow micro-/mesoporous framework,and the resulting carbonized milk powder and sulfur(CMP/S) composites are employed as cathodes for *** is revealed that the hollow micro-/mesoporous CMP/S framework can not only accommodate the volume expansion but also endow smooth pathways for the fast diffusion of electrons and Li-ions,leading to both high capacity and long cycling *** CMP/S composite electrode with 56 wt% loaded sulfur exhibits a remarkable initial capacity of 1596 mAh g^(-1) at 0.1 C,corresponding to 95% of the theoretical *** at a rate of 1 C,it maintains a high capacity of 730 mAh g^(-1) with a capacity retention of 72.6% after 500 cycles,demonstrating a very low capacity fading of only 0.05% per ***,the Coulombic efficiency is always higher than 96%during all the *** only used source material is expired waste milk powders in our *** believe that this "trash to treasure" approach will open up a new way for the utilization of waste material as environmentally safe and high performance electrodes for advanced LSBs.

关键词： composites powders initial

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Optimized Design and Analysis of Clip Bonding Packaging for Avalanche Bipolar Junction Transistor

Optimized Design and Analysis of Clip Bonding Packaging for ...

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Power Electronics and Application Symposium (PEAS), IEEE International

作者： Mosai Xu Lin Liang Xiaoxue Yan State Key Laboratory of Advanced Electromagnetic Technology Engineering Research Center of Power Safety and Efficiency Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

To meet the increasing demand for high switch speed of avalanche bipolar junction transistors (ABJT) and to solve the heat dissipation problem of the commonly used SOT23 packaging, an optimized packaging design for ABJT using the clip bonding is proposed. In this paper, a series of analysis is conducted based on finite element simulation to study the thermomechanical performance of the novel clip bonding packaging. A comparison of the parasitic parameters, thermal and mechanical properties between clip bonding and wire bonding packaging demonstrates that the bigger bonding area leads to lower inductances and thermal resistance, as well as better heat dissipation performance and reliability. The thickness of the copper sheet is also optimized and the reliability analysis is conducted using the Hallberg-Peck model, demonstrating that the reliability of the clip bonding packaging is superior to the conventional SOT23 packaging using wire bonding.

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Ternary NiCoTi-layered double hydroxide nanosheets as a pH-responsive nanoagent for photodynamic/chemodynamic synergistic therapy

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Fundamental Research 2024年第4期4卷 926-933页

作者： Tingting Hu Zhan Zhou Jiajia Zha Gareth RWilliams Zhikang Wu Wei Zhao Weicheng Shen Hai Li Xisheng Weng Ruizheng Liang Chaoliang Tan State Key Laboratory of Chemical Resource Engineering Bejing Advanced Innovation Center for Soft Matter Science and EngineeringBejing University of Chemical TechnologyBeijing100029China College of Chemistry and Chemical Engineering Henan Key Laboratory of Function-Oriented Porous MaterialsLuoyang Normal UniversityLuoyang 471934China Department of Electrical Engineering City University of Hong KongHong Kong SAR 999077China UCL School of Pharmacy University College LondonLondon WCIN 1AXUnited Kingdom Institute of Advanced Materials(IAM)and Key Laboratory of Flexible Electronics(KLoFE) Nanjing Tech University(NanjingTech)Nanjing 211816China Department of Orthopedic Surgery State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100730China Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongHong Kong SAR 999077China Shenzhen Research Institute City University of Hong KongShenzhen 518057China

Combining photodynamic therapy(PDT)with chemodynamic therapy(CDT)has been proven to be a promising strategy to improve the treatment efficiency of cancer,because of the synergistic therapeutic effect arising between the two ***,we report an inorganic nanoagent based on ternary NiCoTi-layered double hydroxide(NiCoTi-LDH)nanosheets to realize highly efficient photodynamic/chemodynamic synergistic *** NiCoTi-LDH nanosheets exhibit oxygen vacancy-promoted electron-hole separation and photogenerated holeinduced O_(2)-independent reactive oxygen species(ROS)generation under acidic circumstances,realizing in situ pH-responsive ***,due to the effective conversion between Co^(3+)and Co^(2+)caused by photogenerated electrons,the NiCoTi-LDH nanosheets catalyze the release of hydroxyl radicals(-OH)from H_(2)O_(2)through Fenton reactions,resulting in *** irradiation enhances the catalyzed ability of the NiCoTi-LDH nanosheets to promote the ROS generation,resulting in a better performance than TiO_(2)nanoparticles at pH *** vitro and in vivo experimental results show conclusively that NiCoTi-LDH nanosheets plus irradiation lead to efficient cell apoptosis and significant inhibition of tumor *** study reports a new pH-responsive inorganic nanoagent with oxygen vacancy-promoted photodynamic/chemodynamic synergistic performance,offering a potentially appealing clinical strategy for selective tumor elimination.

关键词： Layereddouble hydroxides Photodynamic therapy pH-responsive Chemodynamic therapy Oxygen vacancy

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SHAP Algorithm for Transparent Power System Transient Stability Assessment: Critical Impact Factors Identification

SHAP Algorithm for Transparent Power System Transient Stabil...

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International Conference on Power System technology (POWERCON)

作者： Yutian Lan Zhongtuo Shi Wei Yao Rui Zhou Feng Luo Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Grid Electric Power Research Institute Nari Group Corporation Nanjing China

Data-driven power system transient stability assessment (TSA) is a promising way to improve both the prediction efficiency and precision, but “black-box” property affects their reliability and hinders the extraction of knowledge from the model, such as the critical impact factors for transient stability. By developing a TSA model based on imbalance-XGBoost algorithm, it can enhance the identification of unstable samples and increase the reliability of the model. By employing SHAP algorithm, a fast calculation method of Shapley value, to the TSA model, it can achieve the best possible computation of how each feature affects the prediction result. By examining the feature contribution from both local and global aspects, it can thoroughly explore the critical impact factors and offer guidance for power system control. The experiment on the standard 39-bus test system demonstrates that SHAP algorithm can enhance the model interpretability and realize outstanding transient stability assessment by using the obtained critical impact factors.

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Numerical Simulation of the Positive Stem during Dark Period in Long Air Gap Discharge

Numerical Simulation of the Positive Stem during Dark Period...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Liu, Yang Xiao, Pei Zhao, Xiangen Liu, Xiaopeng Wang, Xiankang Du, Yaping He, Junjia Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China State Grid Hunan Electric Power Company Hunan Changsha410007 China Hong Kong Polytechnic University Department of Building Environment and Energy Engineering Hong Kong999077 Hong Kong

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

The stem evolution during the dark period is important for subsequent corona pulses or leader initiation. To this end, a physical model is built to simulate the stem evolution, in which the migration process of space charge and thermodynamic processes of the stem channel (heat conduction, heat convection and thermal diffusion) are both considered. The effect of voltage rise rate, electrode shape, and air pressure on the stem evolution during dark period is investigated. Results show that the space charge migration contributes to the stem elongation on the axial length and be more influential than thermodynamic processes at high voltage rising rates. Moreover, the stem elongation in the axial direction is more evident with a smaller curvature radius of the electrode tip. In addition, as the air pressure decreases, the central temperature of the stem channel rapidly decreases, and the heat dissipation is dominant. This study can help to further understand the characteristics of the dark period and its effect on subsequent discharges. © 2022 IEEE.

关键词： Heat conduction

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Partial Discharge Characteristic of Different Defects at Generator Stator End-winding 10

Partial Discharge Characteristic of Different Defects at Gen...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Chen, Yihong Jia, Shiyuan Peng, Xiaosheng Zhou, Jin Zhang, Yue Li, Cong State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan China Dongfang Electric Machinery CO. LTD. Deyang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

Partial Discharge (PD) monitoring is one of the main methods to evaluate the insulation condition of generator stators to avoid insulation failure. Difference of PD characteristics of different defect types at the generator stator end-winding is be analyzed in this paper, which can provide a basis for PD pattern recognition. Three typical artificial defects were created on generator stator end-winding samples, including end-winding contamination, corona at the junction of the grading paint, and defect in slot exit. High voltage testing is carried out on these three defect models to obtain the PD phase characteristic maps of different kinds of defects at the stator end-winding. The results show that the PD characteristic of different types of defect show obvious differences, among which the discharge of end-winding contamination is the smallest, the PD characteristic pattern of defect at the junction of the grading paint is wing-shaped, the discharge amount of the slot exit defect is the largest, and the PD patterns show layered characteristics. By analyzing the characteristics of the Phase Resolved Partial Discharge (PRPD) patterns of three different defects, it is expected to serve as a basis for the PD pattern recognition at the stator end-winding and ensure the safe operation of the generator set. © 2022 IEEE.

关键词： Partial discharges

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Effect of 2/1 Tearing Mode on Radiation Asymmetry During Disruptions on J-Text

SSRN

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SSRN 2023年

作者： Liu, FanXi Yan, Wei Chen, Chen Zhong Li, You Fang, Jiangang Mao, Feiyue Ren, Zhengkang Zhao, Chuanxu Li, Yangbo Zhong, Yu Li, Feng Zou, Guinan Zhang, Weikang Yu, Yinlong Nie, Zisen Yang, Zhoujun Wang, Nengchao Chen, Zhipeng Ding, Yonghua 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

Plasma disruption in the tokamak is a huge threat to the safe operation of ITER, which will cause serious damage to the tokamak device. At present, massive impurity injection is the main disruption mitigation method, include massive gas injection (MGI) and shattered pellet injection (SPI) which can dissipate most of the internal thermal energy via radiation. However, radiation asymmetry will still cause damage to the device when it results the concentration of radiation in a small area. It has been observed on many devices that n=1 mode has a strong influence on radiation asymmetry. In this paper, the experimental results of radiation asymmetry on J-TEXT tokamak have been introduced, and there is a sine function relationship between toroidal peaking factor (TPF) and the phase of 2/1 tearing mode. It is found that when the injection position is aligned with the X-point of the pre-existing magnetic island, TPF has the maximum value, and while the injection position is between the X-point and the O-point, TPF has the minimum value. This will be helpful for the study of disruption mitigation of future large devices. © 2023, The Authors. All rights reserved.

关键词： Tokamak devices

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Research on Topology and Control Strategy of DR-MMC Cascaded Hybrid HVDC Transmission System for Offshore Wind Power

Research on Topology and Control Strategy of DR-MMC Cascaded...

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International Conference on Power System technology (POWERCON)

作者： Shimin Di Wang Xiang Yinliang Xu Peiyu Meng Haobo Zhang Jinyu Wen Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Establishing a new type of power system with new energy as the mainstay, offshore wind power needs to be greatly flourished. Based on the research background of 2 GW offshore wind power grid connection, the DR-MMC hybrid cascade system is firstly proposed in this paper. Based on reactive power requirements, the feasible operating range of MMC under different capacities was solved. Therefore, the system parameters were optimized. Then designed the corresponding start-up, steady-state and reactive power coordination control strategies for the system. Finally, the electromagnetic transient simulation model of DR-MMC cascaded hybrid HVDC transmission system is built in PSCAD/EMTDC, and the simulation verified the feasibility of the proposed system topology and the effectiveness of the control strategy.

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Model Improvement and Analysis of Nbi Power Supply Under Breakdown Condition

SSRN

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SSRN 2023年

作者： Zhang, Hongqi Li, Zhiheng Ma, Shaoxiang Guo, Jiong Zhang, Ming 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

Breakdown commonly occurs in the acceleration grids of the NBI system. It will cause destructive effects on the accelerating grids, and the generated transient overvoltage and current will threaten the normal operation of the acceleration grid power supply (AGPS). Therefore, it is very necessary to model the circuit to analyze the effects of breakdown on the NBI system. However, the current models are not accurate enough and are likely to have insufficient knowledge of the consequences of breakdown. In this paper, a series of improvements are made to the model by analyzing in detail the change process of AGPS during breakdown and correcting the model parameters in conjunction with the existing AGPS design scheme. Subsequently, the key indicators of the NBI system under breakdown are listed. The impact of breakdown and the need for some protection are assessed based on the results of these indicators. The results of this paper are instructive for the design and breakdown protection of future NBI systems. © 2023, The Authors. All rights reserved.

关键词： Timing circuits

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