检索结果-内蒙古大学图书馆

Multi-point discharge model: study on corona discharge of double-ended needle in large space

Plasma Science and technology 2023年第3期25卷 62-69页

作者：李丁晨李家玮李传张明王鹏宇刘志杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Digital Grid Research Institute China Southern Power GridGuangzhou 510670People’s Republic of China The Fifth Bureau of China State Construction Engineering Corporation Changsha 410000People’s Republic of China

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However,the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter(25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.

关键词： corona discharge numerical simulation multi-point discharge large space double needle tip electrode

来源：评论

学校读者我要写书评

暂无评论

Development of electromagnetic pellet injector for disruption mitigation of tokamak plasma

引用

Chinese Physics B 2023年第7期32卷 29-36页

作者：李峰陈忠勇夏胜国严伟张维康唐俊辉李由钟昱方建港刘凡溪邹癸南喻寅龙聂子森江中和王能超丁永华潘垣 J-TEXT team 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 Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Disruption remains to be a serious threat to large tokamaks like the International Thermonuclear Experimental Reactor(ITER).The injection speed of disruption mitigation systems(DMS)driven by high pressure gas is limited by the sound speed of the propellant *** extrapolating to ITER-like tokamaks,long overall reaction duration and shallow penetration depth due to low injection speed make it stricter for plasma control system to predict the impending *** disruptions with a short warning time may be ***,a fast time response and high injection speed DMS is essential for large scale *** electromagnetic pellet-injection(EMPI)system is a novel massive material injection system aiming to provide rapid and effective disruption *** on the railgun concept,EMPI can accelerate the payload to over 1000 m/s and shorten the overall reaction time to a few *** verify the injection ability and stability of the EMPI,the prototype injector EMPI-1 has been designed and *** preliminary test has been carried out using a 5.9 g armature to propel a dummy pellet and the results suggest that the EMPI configuration has a great potential to be the DMS of the large scale fusion devices.

关键词： tokamak disruption mitigation system electromagnetic pellet-injection(EMPI)

来源：评论

学校读者我要写书评

暂无评论

Highly responsive broadband Si-based MoS2 phototransistor on high-k dielectric

引用

Science China(Information Sciences) 2024年第6期67卷 180-189页

作者： Ali IMRAN Xin HE Jiwei LIU Qinghai ZHU Muhammad SULAMAN Fei XUE Mingsheng XU Deren YANG College of Integrated Circuits State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University ZJU-Hangzhou Global Scientific and Technological Innovation Centre School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor MaterialsZhejiang University Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of Technology

The demand for photodetectors and image sensors has grown exponentially in the past decade in biomedical, security surveillance, robotics, automotive, quality control, image recognition, and military applications, due to their superior quality, broadband detection, lower noise, and economic viability. Here,we report a MoS2channel-based phototransistor over an HfO2/n-Si substrate isolated by an h BN layer. The high photoresponse is achieved through the integration of the photoconduction, photogating, and mobility enhancement process by utilizing excellent features of MoS2, HfO2/Si, and h BN. The capacitive coupling of the photogenerated carriers by high-k dielectric HfO2leads to modulation of MoS2Fermi level due to electrostatic doping. Furthermore, the MoS2also contributes to the photogeneration of carriers due to its semiconducting nature, leading to additional photocurrent. Ultimately, the combination of photogating,photoconduction, and swift carrier extraction with remarkable mobility of 11.65 cm2· V-1· s-1results in high responsivity, external quantum efficiency, and detectivity of 4.5 × 10～8A · W-1, 0.72 × 10～6, and 6.20× 1016Jones at 266 nm illumination, respectively. The device also demonstrates broadband photoresponse from 266–1000 nm wavelengths. The high responsivity distinguishes the potential of our device for the future of optoelectronics and broadband image sensing applications.

关键词： photogating photoconduction two-dimensional materials high $~k$ dielectric carrier scattering phototransistor

来源：评论

学校读者我要写书评

暂无评论

Plasma-activated hydrogel:fabrication,functionalization,and effective biological model

引用

Plasma Science and technology 2023年第9期25卷 1-9页

作者：李嘉诚兰存涛聂兰兰刘大伟卢新培 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Wuhan National High Magnetic Field Center Wuhan 430074People’s Republic of China

Hydrogels are biomaterials with 3D networks of hydrophilic *** generation of hydrogels is turning to the development of hydrogels with the help of enabling *** can tailor the hydrogels’properties through simultaneous physical and chemical actions,resulting in an emerging technology of plasma-activated hydrogels(PAH).PAH can be divided into functional PAH and biological tissue model *** review systematically introduces the plasma sources,plasma etching polymer surface,and plasma cross-linking involved in the fabrication of ***‘diffusion-drift-reaction model’is used to study the microscopic physicochemical interaction between plasma and biological tissue PAH ***,the main achievements of PAH,including wound treatment,sterilization,3D tumor model,etc,and their development trends are discussed.

关键词： plasma-activated hydrogel plasma crosslinking biological model

来源：评论

学校读者我要写书评

暂无评论

Research on Coupling Simulation Method of Temperature Field and Stress Field in Double-Layer Thin-Walled Corrugated Tube 18th

Research on Coupling Simulation Method of Temperature Field ...

引用

18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Tong, Yingjie Cai, Jiaqi Peng, Sisi Chen, Lingxuan Ding, Xuan Xu, Ying Li, Xianhao State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Electromagnetic Energy Wuhan Institute of Marine Electric Propulsion Wuhan430064 China

ISBN: (纸本)9789819710676

In recent years, with the increasing power load in major cities in China, the existing conventional power cables are unable to meet the high-density and high-capacity power transmission requirements. High-temperature superconducting cables, with their characteristics of high capacity, low loss, compact structure, energy-saving, and environmental-friendliness, have promising applications for future urban high-density power transmission. As one of the key components in the cryogenic refrigeration system of superconducting cables, the mechanical performance of double-layer thin-walled stainless steel corrugated tubes directly determines the ability of superconducting cables to resist external forces. In order to study the mechanical performance of double-layer thin-walled stainless steel corrugated tubes under the operating conditions of superconducting cables, this paper establishes a three-dimensional shell model of double-layer thin-walled stainless steel corrugated tubes under tension and bending conditions using finite element simulation. It analyzes the stress and plastic strain distribution characteristics of the double-layer thin-walled corrugated tubes and proposes a temperature field and stress field coupling simulation method for double-layer thin-walled corrugated tubes. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Relationships of Internal Voltage Dependence on Power Imbalance Illustrating Characteristics and Roles in System Dynamics of Inertial-Controlled DFIG-based Wind Turbines

引用

CSEE Journal of Power and Energy Systems 2022年第3期11卷 1107-1117页

作者： Wan, Minhui Yuan, Xiaoming Hu, Jiabing The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

Frequency and voltage dynamics, as the focus of power systems, depends more and more on the frequency and amplitude response characteristics of renewable energy devices being subjected to power imbalance. Doubly-fed induction generator (DFIG)-based wind turbine (WT) is representative of renewable energy devices and shows different characteristics from those of conventional synchronous generator (SG). Unfortunately, the individual characteristics ofWT during system frequency and voltage dynamics are not intuitively illustrated by the existing structure-oriented models. Therefore, this paper aims to propose a function-oriented modeling methodology by representing inertia-controlled DFIG-based WT as internal voltage frequency and amplitude solely stimulated by active and reactive power imbalance. The individuality of characteristics is demonstrated that with grid voltage detection-based controls the internal voltage depends yet solely on power imbalance of WT, just like the case of SG. Through the infinity gain equivalence of the fast-electromagnetic loops, a simplified analytical model illustrating the electromechanical characteristics ofWT is further proposed. Based on the model, the similarities and differences between the characteristics of WT and SG are recognized. Simulation results for verification are also presented. © 2022 China Electric Power Research Institute. All rights reserved.

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

Si-doped Li_(6)PS_(5)I with enhanced conductivity enables superior performance for all-solid-state lithium batteries

引用

Chinese Chemical Letters 2024年第10期35卷 479-484页

作者： Liang Ming Dan Liu Qiyue Luo Chaochao Wei Chen Liu Ziling Jiang Zhongkai Wu Lin Li Long Zhang Shijie Cheng Chuang Yu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Scienceand TechnologyWuhan430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Grid Hubei Electric Power Research Institute Wuhan 430077China College of Physics and Energy Fujian Normal UniversityFuzhou 350117China

Lithium argyrodites Li_(6)PS_(5)X(X=Cl,Br,I)show great potential as solid electrolytes for solid-state lithium batteries due to their high Li-ion conductivities and excellent electrode ***,the relatively low conductivity of Li_(6)PS_(5)I(10^(-6)m S/cm)compared to the other two compositions limits its ***,Si-doped Li_(6.5)P_(0.5)Si_(0.5)S_(5)I electrolyte is designed and synthesized with superior high conductivity of 3.6 mS/*** characterization proves the increase due to the anion disorder and volume expansion caused by ***,the poor interfacial stability between layered oxide cathode Li Ni_(0.6)Co_(0.2)Mn_(0.2)O_(2)and Li_(6.5)P_(0.5)Si_(0.5)S_(5)I inhibits its battery *** introducing Li_(3)InCl6electrolyte in the configuration,the corresponding battery delivers high initial discharge capacity of 150.2m Ah/g and superior cyclability during 250 cycles at 0.5 *** work offers design strategy to obtain Li_(6)PS_(5)I-based electrolytes for high performance solid-state batteries.

关键词： Argyrodite electrolyte Li_(6.5)P_(0.5)Si_(0.5)S_(5)I All-solid-state lithiumbatteries Stability Electrochemical performance

来源：评论

学校读者我要写书评

暂无评论

An Improved Third-Order Generalized Integrator Based Novel Sliding Mode Observer for Piston Stroke Estimation of Linear Oscillatory Machine

An Improved Third-Order Generalized Integrator Based Novel S...

引用

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

作者： Abbass, Mudassar Xu, Wei Junejo, Abdul Khalique Liao, Kaiju Ur Rehman, Khalil Rahman, Abdur School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Haidian District China

ISBN: (纸本)9798331530174

Linear compressors are being widely used in a huge variety of applications due to their higher efficiency than traditional rotary compressors. The linear compressor is driven by the Linear Oscillatory Machine (LOM), and the sensor-less control of LOM is very important to make linear compressors more efficient and compatible auxiliary for big systems like refrigerators, air conditioners, automatic gates etc. A novel piston stroke estimation method has been proposed in this article to obtain the sensor less control of the LOM. This method utilizes an improved third-order generalized integrator (TOGI) based novel sliding mode observer (SMO) for LOM piston stroke estimation. In addition to this, an absolute reaching law with a chosen sliding surface has been implemented to further reduce the effects of sliding chattering. The piston stroke signal suffers DC offsets and harmonics due to mismatched machine parameters, nonlinearities of the converter, and first-order integration of back-electromotive force (EMF). In some recent studies, the second-order generalized integrator (SOGI) has been used to reduce pure integral saturation problem, but it still has a limited attenuation ability against DC components and has considerable steady-state error. Therefore, in order to improve the accuracy of the estimated stroke signals, a new method has been proposed in this article, which can not only solve the integral saturation problem, but also reduce the steady-state error of the estimated piston stroke, effectively. The simulation results and the numerical analysis prove the authenticity of the proposed method. © 2024 IEEE.

关键词： Pistons

来源：评论

学校读者我要写书评

暂无评论

The state-of-the-art of atmospheric pressure plasma for transdermal drug delivery

引用

Plasma Science and technology 2024年第4期26卷 9-26页

作者：聂兰兰刘大伟程鹤赵峰卢新培 State key laboratory of advanced electromagnetic engineering and technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094People’s Republic of China Department of Thoracic Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022People’s Republic of China

Plasma-enhanced transdermal drug delivery(TDD) presents advantages over traditional methods,including painless application, minimal skin damage, and rapid recovery of permeability. To harness its clinical potential, factors related to plasma’s unique properties, such as reactive species and electric fields, must be carefully *** review provides a concise summary of conventional TDD methods and subsequently offers a comprehensive examination of the current state-of-the-art in plasma-enhanced TDD. This includes an analysis of the impact of plasma on HaCaT human keratinocyte cells, ex vivo/in vivo studies, and clinical research on plasma-assisted TDD. Moreover, the review explores the effects of plasma on skin physical characteristics such as microhole formation, transepidermal water loss(TEWL), molecular structure of the stratum corneum(SC), and skin resistance. Additionally, it discusses the involvement of various reactive agents in plasma-enhanced TDD, encompassing electric fields,charged particles, UV/VUV radiation, heat, and reactive species. Lastly, the review briefly addresses the temporal behavior of the skin after plasma treatment, safety considerations, and potential risks associated with plasma-enhanced TDD.

关键词： plasma transdermal drug delivery skin physical characteristics reactive agents

来源：评论

学校读者我要写书评

暂无评论

Optimization Design of Coated Armature in electromagnetic Railgun Based on Multi-objective Genetic Algorithm 10

Optimization Design of Coated Armature in Electromagnetic Ra...

引用

10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xu, Xuan Chen, Lixue Xu, Shengqin Zhang, Wenhao Zhao, Bingxuan Xiao, Tingyun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

The electromagnetic railgun is an advanced launch device that accelerates the armature to ultra-high speed through electromagnetic force. The contact between the armature and the two rails is a kind of ultimate sliding electrical contact beyond high pulse current, high speed, and high contact pressure. It leads to excessive local electromagnetic field distribution at the contact interface, which is not conducive to launch performance. In this paper, armatures of different coated structures are considered to improve the electromagnetic field distribution. First, the characteristic-difference scheme based on the bilinear interpolation method is presented to solve the electromagnetic governing equation of the railgun when launching armatures of different coated structures. Second, an optimization design based on NSGA-II is constructed to obtain the Pareto optimal solution set, and an optimized armature of coated structure that brilliantly meets the design objectives is selected. Finally, numerical calculations are conducted based on the optimized parameters to verify the effectiveness of the multimaterial coated armature structure. Results show that the maximum current density of the optimized armature is reduced by 54% compared to the uncoated armature, current diffusion time at the contact interface along the x-direction is shortened by 80 μs, and the penetration depth of the current along the ydirection at the armature-rail contact interface is increased by 1.6 mm, which significantly optimizes the current distribution during the launch process of the electromagnetic railgun. © 2024 Eindhoven University of technology.

关键词： Multiobjective optimization

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：