检索结果-南通市图书馆

High Voltage 2024年第1期9卷 150-162页

作者： ruoyu han Houda Zhu Qing Chen Hongbin Li Yue Tong Linshan han Yang Jiao School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhanChina China Electric Power Research Institute WuhanChina School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhanChina

As voltage measuring devices are widely used in the high voltage power system with a primary-secondary-fusion structure,electronic voltage transformers are directly connected to the primary conductor and would face much more serious electromagnetic environments than general secondary *** a result,they would still experience failures even when general protection measures are adopted to suppress overvoltages'*** address this issue,an innovative method is proposed after analyses are conducted on the resonance between a transformer and an *** this method,an air-cored coil is installed in a transformer to artificially shift its natural frequency and to dodge the high-frequency dominant component of a transient overvoltage,avoiding the aforementioned resonance and suppressing the secondary *** addition,simulations and laboratory tests are conducted to prove this method's validity.

关键词： transient resonance mentioned

Observation and verification of surface electrical explosion driven by radial-distributed pulsed current in laboratory lightning strike test

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2024年第1期9卷 137-149页

作者： ruoyu han Yuchen Cao Yakun Liu Xi Chen Ting Li Chen Li Pengfei Li State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijingChina School of Mechatronical Engineering Beijing Institute of TechnologyBeijingChina Department of Electrical Engineering Shanghai Jiaotong UniversityShanghaiChina Beijing Institute of Astronautical System Engineering BeijingChina Aerospace Research Institute of Materials and Processing Technology BeijingChina

The laboratory lightning test is essential for assessing the effectiveness of lightning strike protection(LSP).Particularly,direct lightning strike damage can be performed with pulsed current injection into the *** paper focuses on the dynamic process of arc plasma and shock wave behaviour in the vicinity of the‘strike’point.A rod-plate discharge load is built for testing aluminium and coated plate under 40-kA-level pulsed *** visualisation of the luminous discharge plasma and its flow field via high-speed photography(from different angles)is meticulously designed and implemented,synchronised with electro-physical *** results indicate some new mechanisms for lightning strike damage,apart from the impulse heat loading from the thermal *** transient current injection through the arc root concentrates on a thin skin layer(skin-depth effect),with the radial-attenuated current density,driving asynchronously electrical explosions on the plate *** inhomogeneous Joule heating of the plate leads to outwardly propagating phase transition and shock wave along the conductive *** addition,the electro-thermal instability is observed and regarded as the seed of irregular erosion *** information reveals two different plasma states of main discharge arc channel and adjacent surface electrical *** correspondence of the physical mechanism of electrical explosion and optical radiation is *** images for different regions depict erosion characteristics and summarise influencing factors,further confirming the mechanism *** research clarifies the role of skin-depth effect in transaction arc erosion for electrode,complements the electrical explosion theory with unevenly distributed current and helps optimise strategies of LSP.

关键词： electrical lightning radial

Experiments on plasma dynamics of electrical wire explosion in air

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2022年第1期7卷 117-136页

作者： ruoyu han Chen Li Wei Yuan Jiting Ouyang Jiawei Wu Yanan Wang Weidong Ding Yongmin Zhang School of Physics Beijing Institute of TechnologyBeijingChina Global Energy Interconnection Development and Cooperation Organization BeijingChina State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'anChina

Besides a typical high‐density plasma source,electrical explosion of conductors is also indispensable in switches,nanomaterial synthesis,shock‐wave sources,*** this paper,an experimental study regarding plasma dynamics of electrical wire explosions(μs‐timescale)is presented,with spatiotemporal resolved *** Cu/Ni wire and Cu‐Ni alloy wire were used and *** alloy wire usually has a higher resistivity,resulting in a higher initial energy deposition(heating)*** inverse transformation indicated that the plasma radiation focussed on the outer region of the discharge channel for the alloy *** addition,the metallic vapour determined by the material properties had a considerable influence on the plasma process and resulting *** particular,both transverse and axial‐layered structures were observed in alloy wire *** addition,for the first time,the expanding arc‐like plasma of explosion products was understood and examined from aspects of material properties and energy *** later stage of wire explosion resembled the state of regular metal vapour arcs under 1 MPa ***,the core factor for the fast energy deposition stage of wire explosion was *** between pre‐exposition circuit parameters and post‐explosion dynamic effects were found,which is significant for practical applications.

关键词： alloy vapour electrical

Application of an atmospheric pressure plasma jet in a rat model of ischaemic stroke:Design,optimisation,and characteristics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2023年第2期8卷 315-325页

作者： Ye Chen Bingyan Yang Yuqing Liu Lixin Xu Zhongfang Shi Yixiao Liu ruoyu han Fang Yuan Jiting Ouyang Xu Yan Kostya(Ken)Ostrikov Department of Pathophysiology Beijing Neurosurgical Institute/Beijing Tiantan HospitalCapital Medical UniversityBeijingChina School of Basic Medical Sciences Capital Medical UniversityBeijingChina School of Physics Beijing Institute of TechnologyBeijingChina School of Chemistry and Physics and Centre for Biomedical Technologies Queensland University of TechnologyBrisbaneQueenslandAustralia

Recent studies have shown the in vitro neuro-protective functions of atmospheric pressure plasma(APP)against multiple pathological injuries during ischaemic stroke(IS).However,whether APP treatment exerts a therapeutic effect on a rat IS model remains ***,on the basis of needle-to-ring dielectric barrier discharge,an atmospheric pressure plasma jet(APPJ)was designed,with the Helium as the working gas which was driven by a sinusoidal ***,the treatment conditions were optimised for IS rat model treatment and the characteristics of this APPJ were further ***,the rat IS model was established through 90 min middle cerebral artery occlusion(MCAO),and plasma was intermittently inhaled by rats via the nasal cavity for a 2 min period at 60 min of MCAO *** therapeutic effects of this plasma jet device were then evaluated using biomedical *** to our results,intermittent APP inhalation in the MCAO rats increased the serum NO content,improved the neurological function,enhanced regional cerebral blood flow,lowered brain infarction,and reduced the cell apoptosis in brain tissues of MCAO ***,our data provides a novel potential strategy for IS treatment by using atmospheric-pressure plasma inhalation.

关键词： needle cerebral MCAO treatment

斜拉桥非线性索力优化的影响矩阵构建方法研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

桥梁建设 2023年第S2期53卷 97-103页

作者：韩若愚苑仁安中铁大桥勘测设计院集团有限公司湖北武汉430056

为研究更适用于非线性计算的影响矩阵构建方法,以一座主跨280 m和一座主跨1176 m的两塔三跨斜拉桥为背景,考虑几何非线性的影响,分别采用“索力控制法”和“索长控制法”2种影响矩阵构建方法进行斜拉索索力优化,对比2种影响矩阵法求解... 详细信息

为研究更适用于非线性计算的影响矩阵构建方法,以一座主跨280 m和一座主跨1176 m的两塔三跨斜拉桥为背景,考虑几何非线性的影响,分别采用“索力控制法”和“索长控制法”2种影响矩阵构建方法进行斜拉索索力优化,对比2种影响矩阵法求解结构响应和反算索力增量的计算精度,并研究2种影响矩阵法的计算效率和适用性。结果表明:斜拉桥待调目标与基准状态的差异越大,非线性效应越显著,影响矩阵线性叠加计算值与非线性有限元计算值之间的相对误差越大;对于主梁位移计算,随着斜拉桥跨度的增加,“索力控制法”始终保持很高精度,“索长控制法”精度逐渐降低,而对于塔底弯矩计算,2种方法的计算误差均随着目标增量的增大而增大;对于超大跨度斜拉桥,“索力控制法”的主调因素为目标索力,对目标状态的控制效果更优,“索长控制法”存在索力的相互影响,对非线性的适用性相对较差;实际运用中,应根据工程实际需要,结合有限元软件的计算功能以及优化算法,综合选择影响矩阵的构建方法。

关键词：斜拉桥索力优化影响矩阵几何非线性索力控制法索长控制法有限元法

Early-stage latent thermal failure of single-crystal Ni-rich layered cathode

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 578-587页

作者： Xiao han ruoyu Xu Yan Li Yang Ding Manchen Zhang Bo Wang Xiaoxing Ke Manling Sui Pengfei Yan Beijing Key Laboratory of Microstructure1nd Property of Solids Faculty of Materials1nd ManufacturingBeijing University of TechnologyBeijing 100124China Watt Laboratory Central Research InstituteHuawei Technologies Co.LTDShenzhen 518129GuangdongChina

High nickel content worsens the thermal stability of layered cathodes for lithium-ion batteries,raising safety concerns for their *** understanding the thermal failure process can offer valuable guidance for material optimization on thermal stability and new opportunities in monitoring battery thermal runaway(TR).Herein,this work comprehensively investigates the thermal failure process of a single-crystal nickel-rich layered cathode and finds that the latent thermal failure starts at∼120℃far below the TR temperature(225℃).During this stage of heat accumulation,sequential structure transition is revealed by atomic resolution electron microscopy,which follows the layered→cation mixing layered→LiMn_(2)O_(4)-type spinel→disordered spinel→rock *** progression occurs as a result of the continuous migration and densification of transition metal *** transition generates gaseous oxygen,initially confined within the isolated closed pores,thereby not showing any thermal failure phenomena at the *** temperature leads to pore growth and coalescence,and eventually to the formation of open pores,causing oxygen gas release and weight loss,which are the typical TR *** highlight that latent thermal instability occurs before the macro-level TR,suggesting that suppressing phase transitions caused by early thermal instability is a crucial direction for material *** findings can also be used for early warning of battery thermal runaway.

关键词： Thermal runaway Nickel-rich layered cathode Transmission electron microscopy Lithium-ion battery Phase transition

Synergistic Co-doping effect of CNTs and PVP in Na_(4)MnCr(PO_(4))3 cathode as a strategy for improving the electrochemical performance of SIBs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 539-543页

作者： ruoyu Chen Denys S.Butenko Shilin Li Xinyu Zhang Guangshe Li Igor V.Zatovsky Wei han College of Physics State Key Laboratory of Inorganic Synthesis and Preparative ChemistryInternational Center of Future ScienceJilin UniversityChangchun 130012China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China F.D.Ovcharenko Institute of Biocolloidal Chemistry NAS UkraineKyiv 03142Ukraine

In order to solve the contradiction between the rapidly growing energy demand and the excessive exploitation of fossil fuels,it is urgent to research and develops more environmentally friendly and efficient energy storage ***,the development of high-performance cathode materials to enhance the energy density of SIB is currently one of the most important topics of scientific *** high-voltage and low-cost cathode material for SIBs,a composite of carbon-coated Na_(4)MnCr(PO_(4))_(3)(NASICON-type),polyvinylpyrrolidone(PVP),and modified carbon nanotubes(CNTs)is prepared by sol-gel and freeze-drying *** to the high conductivity of CNTs,the conductivity of the composite is significantly improved,and its initial capacity is increased to 114 mAh/g at 0.5 C and 96 mAh/g at 5 C(Mn^(2+)/Mn^(4+)conversion for voltage windows 1.4-4.3 V).Moreover,the multi-electrons transfer of Cr^(3+)/Cr^(4+) and Mn^(2+)/Mn^(4+) can provide a high capacity of 165 mAh/g at 0.1 C and 102 mAh/g at 5 C in the high voltage window of 1.4-4.6 ***,PVP can effectively inhibit the Jahn-Teller effect caused by Mn ion,making the composite have more excellent high-rate performance and *** addition,GITT,EIS and CV curves were drawn to better reveal the excellent kinetic properties of Na_(4)MnCr(PO_(4))_(3)@C@PVP@CNT cathode,and the mechanism of its performance improvement is deeply studied and ***,the co-doping of CNTs and PVP is a simple way to high conductivity and fast charging of cathode materials for SIBs.

关键词： Sodium-ion batteries Na_(4)MnCr(PO_(4))_(3) Carbon nanotubes Polyvinylpyrrolidone Synergistic effect

Discharge and post-explosion behaviors of electrical explosion of conductors from a single wire to planar wire array

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2022年第1期24卷 151-164页

作者：李琛韩若愚刘毅赵锦林王亚楠何锋欧阳吉庭 Research Center for Electrostatics and Applications Beijing Institute of TechnologyBeijing 100081People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China

This work deals with an experimental study of a Cu planar wire array(PWA)in air and water under the stored energy 300-1200 J.A single Cu wire is adopted as a controlled *** configurations of PWA and a wire with the same mass(cross-section area)but the different specific surface areas(15-223 cm^(2)g^(-1))are *** transient process is analyzed using high-speed photography in combination with the results of optical emission and *** characteristics revealed that PWA always has a higher electric power peak,early but higher voltage peak,as well as faster vaporization and ionization process than the single-wire *** to three times stronger optical emission could be obtained when replacing the single-wire with PWA,indicating a higher energy-density state is ***,in both air and water,single-wire load tends to develop a transverse stratified structure,while PWA is dominated by the uneven energy deposition among ***,the synchronism and uniformity of the PWA explosion are discussed.

关键词： electrical explosion wire array metal plasma plasma radiation shock wave

Experiments on the characteristics of underwater electrical wire explosions for reservoir stimulation

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2020年第4期5卷 23-46页

作者： ruoyu han Jiawei Wu Haibin Zhou Yongmin Zhang Aici Qiu Jiaqi Yan Weidong Ding Chen Li Chenyang Zhang Jiting Ouyang School of Physics Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China Global Energy Interconnection Development and Cooperation Organization Beijing 100031China Systems Engineering Research Institute Beijing 100094China

Underwater shock waves generated by pulsed electrical discharges are an effective,economical,and environmentally friendly means of stimulating reservoirs,and this technology has received much attention and intensive research in the past few *** paper reviews the main results of recent work on underwater electrical wire explosion(UEWE)for reservoir *** is developed for microsecond singlewire explosions in water,and diagnostics based on a voltage probe,current coil,pressure probe,photodiode,and spectrometer are used to characterize the UEWE process and accompanying shock ***,the UEWE characteristics under different discharge types are studied and general principles are ***,the shock-wave generation mechanism is investigated experimentally by interrupting the electrical energy injection into the wire at different stages of the wire-explosion *** is found that the vaporization process is vital for the formation of shock waves,whereas the energy deposited after voltage collapse has only a limited ***,the relationships between the electrical-circuit and shock-wave parameters are investigated,and an empirical approach is developed for estimating the shock-wave ***,how the wire material and water state affect the wire-explosion process is *** adjust the shock-wave parameters,a promising method concerning energetic material load is proposed and ***,the fracturing effect of the pulsed-discharge shock waves is discussed,as briefly are some of the difficulties associated with UEWE-based reservoir stimulation.

关键词： electrical underwater reservoir

电爆炸引燃铝粉悬浮液物理特性和冲击波行为研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

兵工学报 2023年第12期44卷 3743-3754页

作者：韩若愚袁伟李琛曹雨晨白洁北京理工大学机电动态控制重点实验室北京100081 北京理工大学物理学院北京100081

高功率电脉冲驱动水中纤细导体电爆炸伴随冲击波、等离子体和光辐射等物理效应,在水下爆炸实验室模拟和非常规油气绿色开发中应用价值显著。受限于电流集肤效应和电气绝缘,增大放电储能和负载质量并不能无限制地增加冲击波强度。为探索... 详细信息

高功率电脉冲驱动水中纤细导体电爆炸伴随冲击波、等离子体和光辐射等物理效应,在水下爆炸实验室模拟和非常规油气绿色开发中应用价值显著。受限于电流集肤效应和电气绝缘,增大放电储能和负载质量并不能无限制地增加冲击波强度。为探索电爆炸复合铝粉悬浮液爆燃对冲击波的增强机制,采用铜丝电爆炸引燃粒径10μm和1μm的铝粉悬浮液,通过对瞬态电物理参数和高速图像的联合诊断,获取金属丝电爆炸引燃铝粉悬浮液的时空演化细节,研究液电击穿和电爆炸机制下铝粉悬浮液放电特性和点火机制,建立放电参数和冲击波特性之间的关联性。实验结果表明,铝粉悬浮液的电爆炸点火过程受到近场冲击波和等离子体光辐射联合作用,随后持续燃烧的铝粉向周围被压缩的水介质注入能量,从而增强了主冲击波的幅值、正压作用时间和总冲量。

关键词：电爆炸等离子体冲击波铝粉悬浮液脉冲功率技术