检索结果-内蒙古大学图书馆

Fluorobenzene diluted low-density electrolyte for high-energy density and high-performance lithium-sulfur batteries

Journal of Energy Chemistry 2022年第5期31卷 752-761页

作者： Zhilong Han Shuping Li Mengjun Sun Renjie He Wei Zhong Chuang Yu Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina School of Physics Huazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

The mass fraction of electrolytes is the crucial factor affecting the energy density of lithium-sulfur(Li-S)batteries. Due to the high porosity within the C/S cathode, high concentration of polysulfides, and side reaction in lithiun metal anode under lean electrolyte, it is extremely challenging to improve performance while reducing the electrolyte volume. Here, we report a novel electrolyte with relatively low density(1.16 g cm^(-2)), low viscosity(1.84 m Pa s), and high ionic conductivity, which significantly promotes energy density and cyclability of Li-S batteries under practical conditions. Moreover, such electrolyte enables a hybrid cathode electrolyte interphase(CEI) and solid electrolyte interface(SEI) layer with plentiful Li F, which leads to fast kinetics of ions transport and stable cyclability even under low *** to Li-S batteries in electrolyte employing 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether(TTE) diluent, the ultra-thick cathode(20 mg cm^(-2)) shows a high capacity of 9.48 m Ah cm^(-2)and excellent capacity retention of 80.3% over 191 cycles at a low electrolyte-to-sulfur ratio(E/S = 2) and negative-to-positive capacity ratio(N/P = 2.5), realizing a 19.2% improvement in energy density in coin cells(from 370 to 441 Wh kg^(-1)) and a high energy density up to 467 Wh kg^(-1) in pouch cells. This study not only provides guidance for the electrolyte design but also paves the way for the development of high performance Li-S batteries under practical conditions.

关键词： High energy density Lithium-sulfur battery Thick sulfur electrode Lean electrolyte Low-density electrolyte

来源：评论

学校读者我要写书评

暂无评论

Design of Power Supply for FRC Plasma Thruster Driven by Pulsed RMF

Design of Power Supply for FRC Plasma Thruster Driven by Pul...

引用

2024 IEEE China International Youth Conference on Electrical engineering, CIYCEE 2024

作者： Zhang, YiSong Yang, Yong Huang, Yuxuan Yi, Xiaopeng Lv, Chaofan Rao, Bo Lv, Fangwei Zhang, Ming School of Electrical and Electronic Engineering Huazhong University of Science and Technology International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Technology Wuhan430074 China

ISBN: (纸本)9798331530174

The Field-reversed configuration (FRC) plasma thruster is a propulsion device driven by Pulsed Rotating magnetic field (RMF) to generate thrust. An FRC plasma thruster prototype has been built. The RMF antennas are designed with very high parameters namely a peak current of 4 kA, a resonant frequency of 150 kHz. Thus, a high voltage, high current pulsed power supply is required to satisfy the design. This article mainly presents the challenges and solutions in the design of the power supply system. First, 4 sets of power supplies are used to feed the RMF coils, which results in design parameters of 4 kA/3.5 kV for each power supply. Then, stray parameters control and loss analysis were done to improve power supply efficiency. Experimental tests are also performed on the system. In conclusion, the designed power supply system can satisfy the requirements of high operation parameters and high controllability. © 2024 IEEE.

关键词： Pulsed plasma thrusters

来源：评论

学校读者我要写书评

暂无评论

A New Device Concept of Magnetic Confinement Deuterium-Deuterium Fusion

引用

Chinese Physics Letters 2023年第10期40卷 39-43页

作者：潘垣武松涛王之江陈志鹏许敏饶波朱平杨勇张明丁永华夏冬辉 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Southwestern Institute of Physics Chengdu 610041China

A two-stage cascade magnetic compression scheme based on field reversed configuration plasma is *** temperature and density of plasma before and after magnetic compression are *** addition,the suppression of the two-fluid effect and the finite Larmor radius effect on the tilting mode and the rotating mode of major magnetic hydrodynamic instability is studied,and finally,the key physical and engineering parameters of the deuterium-deuterium fusion pulse device are *** analysis shows that the fusion neutrons can be produced at an energy flux of more than 2 MW/m^(2)per year,which meets the material testing requirements for the fusion demonstration reactor(DEMO).If the recovery of magnetic field energy is taken into account,net energy outputs may be achieved,indicating that the scheme has a potential application prospect as a deuterium-deuterium pulse fusion energy.

关键词： scheme reversed rotating

来源：评论

学校读者我要写书评

暂无评论

Influence of Phase Angle for Low-order Harmonics on Vibration of an Induction Traction Motor 5

Influence of Phase Angle for Low-order Harmonics on Vibratio...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Kou, Yangbo Xiong, Fei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The vibration and noise problem of induction traction motor has been widely concerned and studied in recent years. This paper focuses on the influence of low-order harmonics phase on electromagnetic force of induction motor. Firstly, the relationship between stator and rotor current phase with harmonics is analyzed qualitatively by equivalent circuit. Then, the electromagnetic force of an induction traction motor is studied. Using two-dimensional Fourier analysis, the main spatial order and frequency of electromagnetic force wave can be calculated. The variation of three main electromagnetic force waves with harmonic phases are analyzed. Finally, the vibration under different harmonic phases is obtained by finite element simulation. The results show that the relationship between electromagnetic force and motor vibration with harmonic phase is basically consistent under low spatial order. © 2022 IEEE.

关键词： Induction motors

来源：评论

学校读者我要写书评

暂无评论

Optimization Scheduling Strategy for Microgrids with Orderly EV Charging Based on Information-Gap Decision Theory 5

Optimization Scheduling Strategy for Microgrids with Orderly...

引用

5th International Conference on Power engineering, ICPE 2024

作者： Yang, Dongjunming Xiong, Xinrui Ma, Rui Lou, Suhua Wang, Guanzhen Lin, Zheng Power Grid Planning & Research Center Guizhou Power Grid Co. Ltd Guiyang China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798331531140

As renewable energy rapidly develops, microgrids have gradually become an essential part of modern power systems. Microgrids integrate distributed generation, energy storage systems, and loads, improving energy utilization efficiency and offering strong resilience against disturbances. Electric vehicles (EVs), as a form of energy storage for renewable energy, have a significant impact on the operation of microgrids through their charging behavior. Proper scheduling of EV charging can not only reduce the operating costs of the microgrid but also balance loads and enhance renewable energy absorption. However, the uncertainty in DG output poses challenges to microgrid scheduling. The Information-Gap Decision Theory (IGDT) is an approach used to solve optimization problems involving uncertainty. Compared to traditional methods for handling uncertainty, such as stochastic programming, fuzzy programming, and interval robust optimization, IGDT has the advantage of not requiring precise probability distributions or uncertainty intervals for uncertain parameters. This paper proposes an optimization scheduling strategy for microgrids with orderly charging of EVs based on IGDT, analyzing the uncertainty of DG output. First, a model of EV travel characteristics and an orderly charging scheduling model are established. Then, a robust optimization model based on IGDT is constructed. The objective is to minimize the total operating cost of the microgrid. © 2024 IEEE.

关键词： Stochastic programming

来源：评论

学校读者我要写书评

暂无评论

Average-Value Modeling of a Capacitor Charge Power Supply with Homopolar Inductor Alternator 3

Average-Value Modeling of a Capacitor Charge Power Supply wi...

引用

3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Yi, Zhengkang Yu, Kexun Lai, Houchuan Guo, Songlin Xie, Xianfei Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Homopolar inductor alternator (HIA) has the advantages of high energy storage density, high reliability, and high rotor strength, and is widely used in inertial energy storage capacitor charging power supply (CCPS). For the pulse alternator capacitor charging system, it is very important to study the charging transient process and explore the influence of various parameters on the charging performance. The current research method is difficult to take the simulation speed and simulation accuracy into account. In this paper, an average-value model modeling method for alternator rectifier systems with large capacitive loads is proposed. After that the HIA-CCPS platform is developed and experiments are carried out. The experimental results are basically consistent with the simulation results of the average-value model, which verifies the accuracy of the average-value model. Finally, the relationship between the average-value model and the VBR (voltage-behind-reactance) model is discussed. © 2022 IEEE.

关键词： Electric inductors

来源：评论

学校读者我要写书评

暂无评论

Investigation of the J-TEXT plasma events by k-means clustering algorithm

引用

Plasma Science and technology 2023年第8期25卷 38-43页

作者：李建超张晓卿张昱 Abba Alhaji BALA 柳惠平周帼红王能超李达陈忠勇杨州军陈志鹏董蛟龙丁永华 the J-TEXT Team Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Physics Federal University DutseJigawa 720101Nigeria 不详

Various types of plasma events emerge in specific parameter ranges and exhibit similar characteristics in diagnostic signals,which can be applied to identify these events.A semisupervised machine learning algorithm,the k-means clustering algorithm,is utilized to investigate and identify plasma events in the J-TEXT *** method can cluster diverse plasma events with homogeneous features,and then these events can be identified if given few manually labeled examples based on physical understanding.A survey of clustered events reveals that the k-means algorithm can make plasma events(rotating tearing mode,sawtooth oscillations,and locked mode)gathering in Euclidean space composed of multi-dimensional diagnostic data,like soft x-ray emission intensity,edge toroidal rotation velocity,the Mirnov signal amplitude and so *** on the cluster analysis results,an approximate analytical model is proposed to rapidly identify plasma events in the J-TEXT *** cluster analysis method is conducive to data markers of massive diagnostic data.

关键词： k-means cluster analysis plasma event machine learning

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

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

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

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

来源：评论

学校读者我要写书评

暂无评论

Pt single atoms coupled with Ru nanoclusters enable robust hydrogen oxidation for high-performance anion exchange membrane fuel cells

引用

Nano Research 2024年第7期17卷 6147-6156页

作者： Jianmei Wang Bingxing Zhang Xiaozhong Zheng Xuerui Liu Wei Guo Zhouxin Luo Yongfeng Liu Mingxia Gao Jian Chen Zhongbin Zhuang Hongge Pan Wenping Sun School of Materials Science and Engineering Zhejiang UniversityHangzhou 310058China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Lab of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Institute of Science and Technology for New Energy Xi’an Technological UniversityXi’an 710021China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

The sluggish reaction kinetics of alkaline hydrogen oxidation reaction(HOR)is one of the key challenges for anion exchange membrane fuel cells(AEMFCs).To achieve robust alkaline HOR with minimized cost,we developed a single atom-cluster multiscale structure with isolated Pt single atoms anchored on Ru nanoclusters supported on nitrogen-doped carbon nanosheets(Pt1-Ru/NC).The well-defined structure not only provides multiple sites with varied affinity with the intermediates but also enables simultaneous modulation of different sites via interfacial *** addition to weakening Ru–H bond strength,the isolated Pt sites are heavily involved in hydrogen adsorption and synergistically accelerate the Volmer step with the help of Ru ***,this catalyst configuration inhibits the excessive occupancy of oxygen-containing species on Ru sites and facilitates the HOR at elevated *** Pt1-Ru/NC catalyst exhibits superior alkaline HOR performance with extremely high activity and excellent *** AEMFC with a 0.1 mg·cmPGM^(−2)loading of Pt1-Ru/NC anode catalyst achieves a peak powder density of 1172 mW·cm^(−2),which is 2.17 and 1.55 times higher than that of Pt/C and PtRu/C,*** work provides a new catalyst concept to address the sluggish kinetics of electrocatalytic reactions containing multiple intermediates and elemental steps.

关键词： nanoclusters multiscale structure hydrogen oxidation reaction electrocatalysis anion exchange membrane fuel cells

来源：评论

学校读者我要写书评

暂无评论

The impact of toroidal mode coupling on high-density discharges in J-TEXT

引用

Plasma Science and technology 2024年第12期26卷 1-8页

作者： Peng DENG Wenzhe MAO Zhipeng CHEN Yinan ZHOU Peng SHI Zhoujun YANG Li GAO Tao LAN Jinlin XIE Hong LI Zian WEI Adi LIU Chu ZHOU Weixing DING Wandong LIU Ge ZHUANG School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China 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 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

Density limit has long been a widely studied issue influencing the operating range of *** rapid growth of the m/n=2/1(where m and n are poloidal and toroidal mode numbers,respectively)tearing mode is generally regarded as a primary precursor to the density limit *** this experiment,the coupling of the m/n=1/1 mode and the m/n=2/1 mode in highdensity plasma was *** a sawtooth cycle,the frequencies of the two modes gradually converge until they become *** that,toroidal coupling occurs between the 1/1 and 2/1 modes,resulting in a mutually fixed phase *** the occurrence of toroidal coupling,the 2/1 mode is *** to the disruption,the cessation of the 1/1 and 2/1 mode coupling,along with the rapid growth in the amplitude of the 2/1 mode,can be ***,under the same parameters,comparing discharges with or without the 1/1 mode,it is found that the presence of the 1/1 mode leads to higher plasma density and temperature parameters.

关键词： toroidal coupling tearing mode density limit sawtooth

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：