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An improved efficient adaptive method for large-scale multiexplosives explosion simulations

Defence technology(防务技术) 2025年第3期45卷 28-47页

作者： Tao Li Cheng Wang Baojun Shi School of Mechanical Engineering Key Laboratory of Advanced Intelligent Protective Equipment TechnologyMinistry of EducationHebei University of TechnologyTianjin300401China State Key Lab of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing 100081China

Shock wave caused by a sudden release of high-energy,such as explosion and blast,usually affects a significant range of *** utilization of a uniform fine mesh to capture sharp shock wave and to obtain precise results is inefficient in terms of computational *** is particularly evident when large-scale fluid field simulations are conducted with significant differences in computational domain *** this work,a variable-domain-size adaptive mesh enlargement(vAME)method is developed based on the proposed adaptive mesh enlargement(AME)method for modeling multi-explosives explosion *** vAME method reduces the division of numerous empty areas or unnecessary computational domains by adaptively suspending enlargement operation in one or two directions,rather than in all directions as in AME method.A series of numerical tests via AME and vAME with varying nonintegral enlargement ratios and different mesh numbers are simulated to verify the efficiency and order of *** estimate of speedup ratio is analyzed for further efficiency *** large-scale near-ground explosion experiments with single/multiple explosives are performed to analyze the shock wave superposition formed by the incident wave,reflected wave,and Mach ***,the vAME method is employed to validate the accuracy,as well as to investigate the performance of the fluid field and shock wave propagation,considering explosive quantities ranging from 1 to 5 while maintaining a constant total *** results show a satisfactory correlation between the overpressure versus time curves for experiments and numerical *** vAME method yields a competitive efficiency,increasing the computational speed to 3.0 and approximately 120,000 times in comparison to AME and the fully fine mesh method,*** indicates that the vAME method reduces the computational cost with minimal impact on the results for such large-scale high-energy release problems with signi

关键词： Large-scale explosion Shock wave Adaptive method Fluid field simulations Efficient method

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Enhancing solid-state lithium metal battery performance via indium-based modification of electrolytes and lithium metal surfaces:mechanistic insights and optimization

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Science China Chemistry 2025年第3期68卷 1144-1158页

作者： Zhongkai Wu Chen Liu Ziling Jiang Lin Li Siwu Li Chaochao Wei Qiyue Luo Xia Chen Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China Interdisciplinary Research Center of Smart Sensors Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an 710126China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China

Argyrodite-based solid-state lithium metal batteries exhibit significant potential as next-generation energy storage ***,their practical applications are constrained by the intrinsic poor stability of argyrodite towards Li metal and exposure to air/***,an indium-involved modification strategy is employed to address these *** optimized doping yields a high Li-ion conductivity of 7.5 mS cm^(-1)for Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte,accompanied by enhanced endurance against air/moisture and bare Li *** retains 92.0%of its original conductivity after exposure to air at a low dew point of-60℃in dry ***,a composite layer comprising Li-In alloy and Li F phases is generated on the surface of lithium metal anode via the reaction between InF_(3)and molten *** layer effectively mitigates Li dendrite growth by creating a physical barrier from the robust LiF phase,while the Li-In alloy induces uniform Li-ion deposition and accelerates Li transport dynamics across the interphase between the solid electrolyte/Li ***,the In-doped electrolyte facilitates the in-situ generation of Li-In alloy within its voids,reducing local current density and further inhibiting lithium dendrite ***,the combination of the Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)electrolyte and the InF_(3)@Li anode provides exceptional electrochemical performances in both symmetric cells and solid-state lithium metal batteries across different operating ***,the LiNbO_(3)@LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)/Li_(5.54)In_(0.02)PS_(4.47)O_(0.03)Cl_(1.5)/InF_(3)@Li cell delivers a high discharge capacity of 167.8 mAh g^(-1)at 0.5 C under 25℃and retains 80.0%of its initial value after 400 *** work offers a viable strategy for designing functional interfaces with enhanced stability for sulfide-based solid-state lithium batteries.

关键词： Li_(5.5)PS_(4.5)Cl_(1.5)solid electrolyte In_(2)O_(3)dual-doping InF_(3)surface-modification chemical/electrochemical stability electrochemical performance

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Design and experimental study of a field-reversed configuration plasma thruster prototype

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Plasma Science and technology 2025年第3期27卷 118-126页

作者： Yuxuan HUANG Ming ZHANG Yong YANG Fangwei LYU Xiaopeng YI Chaofan LYU Yisong ZHANG Bo RAO State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China National Key Laboratory of Science and Technology on Vacuum Technology and Physics Lanzhou Institute of PhysicsLanzhou 730000People’s Republic of China

The field-reversed configuration(FRC)plasma thruster driven by rotating magnetic field(RMF),abbreviated as the RMF-FRC thruster,is a new type of electric propulsion technology that is expected to accelerate the deep space *** experimental prototype,including diagnostic devices,was designed and constructed based on the principles of the RMF-FRC thruster,with an RMF frequency of 210 kHz and a maximum peak current of 2 *** the rated operating conditions,the initial plasma density was measured to be 5×10^(17)m^(-3),and increased to 2.2×10^(19)m^(-3)after the action of *** coupling efficiency of RMF was about 53%,and the plasma current reached 1.9 *** axial magnetic field changed in reverse by 155 Gauss,successfully reversing the bias magnetic field of 60 Gauss,which verifies the formation of FRC *** optimization research,it was found that when the bias magnetic field is 100 Gauss,the axial magnetic field reverse variation caused by FRC is the highest at 164 *** experimental results are discussed and strategies are proposed to improve the performance of the prototype.

关键词： rotating magnetic field(RMF) field-reversed configuration(FRC) plasma thrusters plasma current

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Fine-Tuning the Resonant Frequency in electromagnetic Vibration Energy Harvesting System 5th

Fine-Tuning the Resonant Frequency in Electromagnetic Vibrat...

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5th International Conference on Vibration and Energy Harvesting Applications, VEH 2024

作者： Ma, Haosheng Peng, Han Xiao, Hongfei Sun, Hanyi Zhao, Yidong Lei, Junhao State Key Lab 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

ISBN: (纸本)9789819611904

The electromagnetic vibration energy harvesting system is designed to extract energy from the vibrations, with its resonant frequency specifically tuned to match the primary vibration frequency of the energy source. However, the vibration frequency often deviates from resonant frequency under different operation/weather and installation circumstances. Such deviation can lead to a significant decrease in the collected output power. For example, a 1 Hz deviation in the vibration frequency results in a 51.3% decrease in induced voltage and a 76.3% decrease in output power. state-of-the-art wideband EVEH devices have either low output power or relatively large volume. Adopting a wideband EVEH is not a good choice. To address this issue, this paper proposes a new approach for fine-tuning the resonant frequency of EVEH by changing the structure of the spring. The details of the method is to add or remove bridge arms changing the rotation angle of the cantilever beams. The advantage of this method lies in the convenience of finely tuning the device's frequency while obtaining a larger output power. The results demonstrate that for the EVEH device designed at a resonant frequency of 60 Hz, the primary resonant frequency can vary from 58.5 to 59.5 Hz by nylon bridge arms. At resonant frequencies of 59 Hz and 0.5 g acceleration, the output voltage is increased by 77.1%. Output power reaches 15 mW, representing a 213.8% improvement. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Energy harvesting

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Multi-objective Optimization Method of arc Armature Based on Anti-Transition 19th

Multi-objective Optimization Method of arc Armature Based on...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Gu, Anbang Xia, Shengguo Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819608966

Three optimization objectives are proposed to suppress transition during the armature launching process: the deviation rate of the current density distribution on the armature rail’s contact surface under steady-state current, the deviation rate of the current density distribution on the throat’s surface under steady-state current, and the deviation degree of the overfill contact pressure’s center of action. The NSGA-2 multi-objective optimization algorithm is used to optimize the armature structure. Firstly, the random response surface of the optimization objectives is established in a large range of armature geometrical parameters, and then the range of values of armature geometrical parameters is obtained according to the limitations of the armature structure in the actual problem, and then the optimization of the armature structure is carried out and the optimal compromise solution is screened out in this range. The simulation results show that the optimized armature, compared with the benchmark armature, has a more centered distribution of the overfill contact pressure on the contact surface, smaller current peaks on the contact surface of the armature rails during the launching process, and lower maximum temperature at the throat, which indicates that the optimized armature is more capable of suppressing the armature start-up phase transition, the magnetic saw of the throat transition, and the current falling-edge phase transition. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Multiobjective optimization

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Enhanced Passivation Effect of Tunnel Oxide Prepared by Ozone-Gas Oxidation(OGO) for n-Type Polysilicon Passivated Contact(TOPCon) Solar Cells

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Energy & Environmental Materials 2025年第1期8卷 195-200页

作者： Lei Yang Yali Ou Xiang Lv Na Lin Yuheng Zeng Zechen Hu Shuai Yuan Jichun Ye Xuegong Yu Deren Yang State Key Lab of Silicon and Advanced Semiconductor Materials and School of Materials Science & Engineering Zhejiang University Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Hangzhou Global Scientific and Technological Innovation Center Zhejiang University

Nowadays,a stack of heavily doped polysilicon（poly-Si） and tunnel oxide（SiOx） is widely employed to improve the passivation performance in n-type tunnel oxide passivated contact（TOPCon） silicon solar *** this case,it is critical to develop an in-line advanced fabrication process capable of producing high-quality tunnel ***,an in-line ozone-gas oxidation（OGO） process to prepare the tunnel SiOx is proposed to be applied in n-type TOPCon solar cell fabrication,which has obtained better performance compared with previously reported in-line plasma-assisted N2O oxidation（PANO） process.

关键词： interface states ozone-gas oxidation silicon solar cells tunnel oxide passivation contact (TOPCon)

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Influence of 3D helical magnetic perturbations on runaway electron generation in J-TEXT tokamak

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Plasma Science and technology 2025年第3期27卷 36-44页

作者： Wei YAN Guinan ZOU Zhongyong CHEN You LI Jiangang FANG Zhifang LIN Zhonghe JIANG Nengchao WANG Bo RAO Yangbo LI Zhengkang REN Chuanxu ZHAO Yu ZHONG Fanxi LIU Yinlong YU Zisen NIE Xun ZHOU Yuan SHENG Yuwei SUN Song ZHOU Xiaoqing ZHANG Zhoujun YANG Zhipeng CHEN Yonghua DING the J-TEXT Team State Key Laboratory of Advanced Electromagnetic Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma PhysicsSchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People’s Republic of China 不详

A large number of runaway electrons(REs)generated during disruption can cause significant damage to next-generation large-scale *** influence of three-dimensional(3D)helical magnetic perturbations on the suppression of RE generation was explored using a set of 3D helical coils in J-TEXT tokamak,which can excite m/n=-2/2 helical magnetic *** evidence shows that the-2/2 magnetic perturbations caused by the opposite coil current direct plasma toward the high-field side,simultaneously enhancing the magnetic fluctuations,which would enhance the radial loss of REs and even prevent RE *** the other hand,-2/2 magnetic perturbations can also reduce the cooling time during the disruption phase and generate a population of high-energy REs,which can interact with high-frequency magnetic fluctuations and in turn suppress RE *** critical helical coil current was found to correlate with electron density,requiring higher coil currents at higher *** to the statistical analysis of RE generation at different electron densities,the applied-2/2 magnetic perturbations can increase the magnetic fluctuations to the same level at lower electron densities,which can decrease the threshold electron density for RE *** will be beneficial for RE mitigation in future large tokamak devices.

关键词： 3D helical magnetic perturbations runaway electron J-TEXT tokamak

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Low sintering shrinkage porous ceramics: Principles, progress, and perspectives

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Journal of advanced Ceramics 2025年第2期14卷 1-36页

作者： Jie Xu Yueqi Shao Xiaoying Feng Xiaoyan Zhang Hao Li Jinlong Yang Feng Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Porous ceramics are lightweight materials with diverse pore structures and are widely applied in areas such as thermal insulation, sound absorption, filtration, catalysis, and energy storage. However, excessive shrinkage during the sintering process of porous ceramics leads to cracking and deterioration, posing significant challenges for achieving complex shapes. Despite its importance, the field of low sintering shrinkage porous ceramics has not received sufficient attention. This review systematically discusses the principles and progress in the development of low sintering shrinkage porous ceramics. First, we introduce the characteristics of various preparation methods, including partial sintering, particle-stabilized foaming, gel-casting, foam-gelcasting, and additive manufacturing (AM). We then explain three primary principles of low sintering shrinkage from the perspectives of the volume effect and mass transfer processes. This review focuses on the properties and applications of typical low sintering shrinkage ceramics such as mullite and alumina, particularly their mechanical properties and thermal conductivity as thermal insulation and ceramic cores. Finally, we summarize the current state and present future perspectives on low sintering shrinkage porous ceramics.

关键词： porous ceramics low sintering shrinkage volume expansion mass transfer process pore structure properties

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Manipulating Interfacial Stability via Preferential Absorption for Highly Stable and Safe 4.6 V LiCoO_(2) Cathode

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Nano-Micro Letters 2025年第8期17卷 95-110页

作者： Long Chen Xin He Yiqing Chen Youmin Hou Yujie Zhang Kangli Wang Xinping Ai Yuliang Cao Zhongxue Chen Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072People’s Republic of China

Elevating the upper cutoff voltage to 4.6 V could effec-tively increase the reversible capacity ofLiCoO_(2)(LCO)cathode,whereas the irreversible structural transition,unstable electrode/electrolyte interface and potentially induced safety hazards severely hinder its industrial *** a robust cathode/electrolyte interface film by electrolyte engineer-ing is one of the efficient approaches to boost the performance of high-voltage LCO(HV-LCO);however,the elusive interfacial chemistry poses substantial challenges to the rational design of highly compatible ***,we propose a novel electrolyte design strategy and screen proper solvents based on two factors:highest occupied molecular orbital energy level and LCO absorption ***(2,2,2-trifluoroethyl)phosphate is determined as the optimal solvent,whose low defluorination energy barrier significantly promotes the construction of LiF-rich cathode/electrolyte interface layer on the surface of LCO,thereby eventually suppresses the phase transition and enhancesLi+diffusion *** rationally designed electrolyte endows graphite||HV-LCO pouch cells with long cycle life(85.3%capacity retention after 700 cycles),wide-temperature adaptability(-60–80℃)and high safety(pass nail penetration).This work provides new insights into the electrolyte screening and rational design to constructing stable interface for high-energy lithium-ion batteries.

关键词： Electrolyte design LiF-rich interface Wide-temperature High-safe 4.6 V LCO

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A Real-Time Junction Temperature Estimating Method for SiC MOSFET Based on the Turn-on Drain-Source Current Oscillation

A Real-Time Junction Temperature Estimating Method for SiC M...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Yang, Fengming Liang, Lin Zhang, Ziyang State Key Laboratory of Advanced Electromagnetic Technology Power Electronics and Energy Management Key Laboratory Ministry of Education of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430070 China

ISBN: (纸本)9789819618514

Online junction temperature (Tj) measurement is critical for SiC MOSFET reliability evaluation health management and life prediction. In order to make the tradeoff between availability, simplicity, as well as accuracy, this article demonstrates a real-time junction temperature estimating method by selecting the current oscillation peak of drain source (Ioscpeak) during turn-on transient as a temperature sensitive electrical parameter (TSEP). The theoretical and simulation analysis results show that the Ioscpeak is available to be a TSEP. Then, the model of Ioscpeak and Tj is derived through fitting curve based the experimental results. The voltage and load current dependency of proposed method are also discussed. The experimental results demonstrate that the bus voltage level has a negligible influence to the relationship between the Ioscpeak and the Tj, the value of Ioscpeak is increasing with the increment of current level at the specific temperature. The sensitivity of proposed method has a satisfactory performance of junction temperature estimation. The estimation circuit of proposed method has a simplicity hardware with low cost and easy to be implanted with gate drive of SiC MOSFET. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： MOSFET devices

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