检索结果-内蒙古大学图书馆

Effect of icosahedral phase formation on the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li(in wt.%)based alloys

引用

Journal of Magnesium and Alloys 2024年第1期12卷 225-236页

作者： Shuo Wang Daokui Xu Dongliang Wang Zhiqiang Zhang Baojie Wang Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium Materials and Technology BinzhouShandong Province256606China

Through exploring the stress corrosion cracking(SCC)behaviors of the as-cast Mg-8%Li and Mg-8%Li-6%Zn-1.2%Y alloys in a 0.1 M NaCl solution,it revealed that the SCC susceptibility index(I_(SCC))of the Mg-8%Li alloy was 47%,whilst the I_(SCC)of the Mg-8%Li-6%Zn-1.2%Y alloy was 68%.Surface,cross-sectional and fractography observations indicated that for the Mg-8%Li alloy,theα-Mg/β-Li interfaces acted as the preferential crack initiation sites and propagation paths during the SCC *** regard to the Mg-8%Li-6%Zn-1.2%Y alloy,the crack initiation sites included the I-phase and the interfaces of I-phase/β-Li andα-Mg/β-Li,and the preferential propagation paths were the I-phase/β-Li andα-Mg/β-Li ***,the SCC of the two alloys was concerned with hydrogen embrittlement(HE)mechanism.

关键词： Magnesium-lithium alloy Stress corrosion cracking I-phase Fracture analysis

来源：评论

学校读者我要写书评

暂无评论

Experimental Study on Electrode Erosion Process with High Current Vacuum Arc 19th

Experimental Study on Electrode Erosion Process with High Cu...

引用

19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Peng, Ruochen Li, Yilong Zhao, Yuan Chen, Lixue Ya, Penglong Lyu, Tianmao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science & Technology Wuhan China School of Electrical and Electronic Engineering Huazhong University of Science & Technology Wuhan China Key Laboratory of Pulsed Power Technology Huazhong University of Science & Technology Ministry of Education China

ISBN: (纸本)9789819613861

During the breaking process, the erosion of anode contact greatly affects the result of high current vacuum breaking. Therefore, it is important to study the forming and transforming process of anode modes for improving the breaking performance and life of vacuum circuit breaker. The cup axial magnetic field (AMF) contacts is widely used in vacuum trigger switch and vacuum on-load tap changer. In order to study the vacuum arc characteristics and anode mode change of cup AMF contacts under high current density, the 40 mm diameter cup AMF contacts with six slots is observed and studied by experimental means under the gap distance of 6 mm and 10 mm. In this paper, the arc current-voltage characteristics, vacuum arc shape and surface erosion of contact are analyzed. The analysis results show that the larger the contact gap, the larger the arc voltage, the smaller the arc anode mode threshold current and the more serious the contact erosion degree. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Anodes

来源：评论

学校读者我要写书评

暂无评论

Ablation behavior and mechanism of MoSi2/mica/HSM modified CF/BPR composites during prolonged ablation of oxyacetylene flame

引用

Ceramics International 2025年第18期51卷 26370-26378页

作者： Zhang, Shiquan Zhang, Jian Hu, Sheng Zhang, Ruizhi Li, Junguo Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Xiangyang441000 China School of Chemical and Environment Engineering Hubei Minzu University Enshi445000 China

Ablative thermal protection materials are widely used in entry and re-entry vehicles which benefit from their strong adaptability. However, long-term ablation has been a limitation due to the consumption of the matrix of the ablative materials. In this work, the microstructure evolution and ablation properties of the MoSi2/mica-modified CF/BPR composites with and without hollow silicate glass microspheres (HSMs) under protracted ablation have been investigated. The mass ablation rates decreased while the linear ablation rates increased when the ablation times were prolonged. The composites with 30 vol.% HSMs have good insulation properties, shown by a lower backside temperature of 240.9 °C after 100 s of ablation. The decrease in thermal conductivity limited heat transfer in both the axial and horizontal directions. This led to heat concentration and severe ablation at the central surface. The three-dimensional porous and the ladder structure formed in the transfer region, and the features gradually disappeared while extending the ablation times because of the flame erosion and formed liquid phases. The heat diffusion and concentration within the matrix established a gradient temperature field, which determined the ablation behavior and mechanism, providing valuable insights for the development of advanced ablative thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicates

来源：评论

学校读者我要写书评

暂无评论

Accurate Distinction of Weak and Strong AC Grids for Emerging Hierarchical-Infeed LCC-UHVDC Systems

引用

CSEE Journal of Power and Energy Systems 2024年第2期10卷 772-777页

作者： Hao Xiao Xianzhong Duan Yi Zhang Department of Electrical and Computer Engineering University of ManitobaWinnipeg R3T 2N2ManitobaCanada 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 TechnologyWuhan 430074HubeiChina RTDS Technologies Inc. Winnipeg R3T 2E1ManitobaCanada

Distinction of weak and strong AC grids for emerging hierarchical-infeed LCC-UHVDC systems is important for planning and operation departments. However, accuracy of earlier distinction methods is limited as they were developed by empirical reasoning without rigorous theoretical analysis. Hence in this letter, hierarchical-infeed interactive effective short-circuit ratio (HIESCR) index is first used for strength evaluation of HIDC systems with complex inter-inverter interactions considered. Boundary HIESCR (BHIESCR) is also introduced in the proposed distinction method of weak and strong AC grids. That is, weak (or strong) AC grids are, respectively, identified when HIESCR is less (or greater) than BHIESCR. Second, it is shown BHIESCR remains almost unchanged as 3.0 versus various system parameters and rated operation variables based on rigorous theoretical analysis. This salient feature makes the proposed method more accurate than earlier methods. Finally, the proposed method is validated by simulations based on the PSCAD/EMTDC program.

关键词： Hierarchical-Infeedinteractive effective short-circuit ratio hierarchical-infeed LCC-UHVDC systems inter-inverter interactions strong AC grids weak AC grids

来源：评论

学校读者我要写书评

暂无评论

Analysis of Three-Phase Short-Circuit Electromotive Force on Six Vacuum-Break Parallel-Type Generator Outlet Circuit Breakers 11th

Analysis of Three-Phase Short-Circuit Electromotive Force on...

引用

11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Sun, Likang Chen, Lixue He, Yinghui Zou, Xinyang Li, Yingzhuo State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819787791

Currently, vacuum type generator outlet circuit breaker dominates the large-capacity generator circuit breaker. However, due to the large short-circuit current at the generator outlet end, the generator outlet circuit breaker needs to bear a great short-circuit electromotive force, thus affecting its dynamic stability. In this paper, COMSOL is used to construct a model of a six vacuum break parallel type outlet circuit breaker for the protection of a megawatt-level generator. Based on Maxwell's electromagnetic theory, the transient calculation of three-phase short-circuit electromotive force under different phases is carried out for the generator outlet vacuum circuit breaker, and the great values of short-circuit electromotive force under different phases are obtained for each phase. The results show that the main component of the short-circuit electromotive force is the electromotive force in the y-direction. And based on the maximum transient electromotive force, the influence of the material on the short-circuit electromotive force is studied, which provides theoretical support for the analysis of the short-circuit electromotive force of the generator outlet circuit breaker and the optimized design of the shell. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric shielding

来源：评论

学校读者我要写书评

暂无评论

Analysis on Circulating Current and Split Capacitor Voltage Balance for Modular Multilevel Converter Based Three-phase Four-wire Split Capacitor DSTATCOM

引用

Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 657-667页

作者： Lei Lin Jialu He Chen Xu State Key Laboratory of Advanced Electromagnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

We propose a modular multilevel converter(MMC)based three-phase four-wire(3P4W)split capacitor distribution static synchronous compensator(DSTATCOM),aiming at compensating unbalanced and reactive load *** to the zero-sequence current compensation,the circulating current char-acteristics of 3P4W MMC-DSTATCOM are different from conventional ***,the distinct working principle of IMMC would affect the features of split capacitor *** decoupled positive-,negative-and zero-sequence second-order and DC components of the circulating current are deduced *** proportional-integral controllers with dual dq transformation are employed to suppress the positive-and negative-sequence components of second-order circulating current,while quasi proportional-resonance controller is designed to eliminate the zero-sequence ***,the phenomenon of the unbalanced split capacitor voltages is revealed,and fast-tracking balancing method by controlling zero-sequence current flowing through the split capacitors is *** simulation results verify the accuracy of the analysis and the feasibility of the suppression methods.

关键词： Circulating current modular multilevel converter(MMC) distribution static synchronous compensator(DSTATCOM) split capacitor three-phase four-wire(3P4W)

来源：评论

学校读者我要写书评

暂无评论

Application of the interpretable disruption prediction model to the J-TEXT high-density disruption experiment 4

Application of the interpretable disruption prediction model...

引用

4th International Conference on Energy, Power and Electrical engineering, EPEE 2024

作者： Lin, Weijie Shen, Chengshuo Gao, Li Yang, Zhoujun Huazhong University of Science and Technology 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 Wuhan China

ISBN: (纸本)9798331518066

Nuclear fusion energy generated by magnetic confinement reactors plays a central role in preventing global energy insecurity and atmospheric pollution. Disruption as a plasma instability can terminate the fusion reaction and damage key components. Predicting and mitigating disruption represents one of the pressing challenges for tokamak devices. Moreover, the disruption predictor can be used for more than just predicting disruption owing to the learned disruption physics. In our previous research, an interpretable disruption predictor(IDP-PGFE) was developed to predict disruption and brought a new sight for disruption experiments under RMPs. Electron Cyclotron Resonance Heating (ECRH) can affect the density limit in experiments conducted on J-TEXT. Distinguishing the causes of disruption in high-density experiments under ECRH helps the understanding of physics mechanisms. In this paper, the application of IDP-PGFE in high-density disruption experiments under ECRH has been introduced. Benefiting from strong interpretability, IDP-PGFE can help researchers accurately identify various types of disruptions, including typical density limit disruptions, radiation-enhanced disruptions, and those driven by increased Magnetohydrodynamics (MHD) instabilities. This approach provides valuable insights into the mechanisms underlying disruption events and contributes to advancing disruption prediction capabilities in fusion research. © 2024 IEEE.

关键词： Tokamak devices

来源：评论

学校读者我要写书评

暂无评论

Design and Analysis of Coupled Self-charging Mechanical DC Circuit Breaker

Design and Analysis of Coupled Self-charging Mechanical DC C...

引用

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

作者： Xie, Yunlong Yuan, Zhao Chen, Lixue State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620456

Mechanical DC circuit breakers have become an irreplaceable part of flexible DC power grids because of their advantages of high economy, low con-duction impedance, and reliable control. However, the large volume of the charging circuit and the high interruption pressure in low current are still the problems it faces. To address the aforementioned issues, a Coupled Self-charging Mechanical DC Circuit Breaker (CSC-DCCB) is proposed. This innovative solution mitigates the risk of switch arc reignition during the commutation process by incorporating a self-charging circuit. The energy consumption process of metal-oxide varistor will cause the capacitor to complete recharging, and this voltage will be used for the reclosing of the CSC-DCCB. Secondly, the parameter of the CSC-DCCB is optimized to achieve a lower overall capacity of the circuit breaker and the rated voltage of the converter switches, which retains the traditional low conduction loss. Finally, the feasibility of CSC-DCCB is validated through PSCAD, the technical parameters of CSC-DCCB are compared with traditional DCCB, showing that CSC-DCCB has better economic efficiency. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Flexible electronics

来源：评论

学校读者我要写书评

暂无评论

Bidirectionally aligned MXene hybrid aerogels assembled with MXene nanosheets and microgels for supercapacitors

引用

Rare Metals 2023年第4期42卷 1249-1260页

作者： Pei-Xuan Li Guo-Zhen Guan Xin Shi Lei Lu Yu-Chao Fan Jie Xu Yuan-Yuan Shang Ying-Jiu Zhang Jin-Quan Wei Feng-Mei Guo Key Laboratory of Material Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450052China Key Lab for Advanced Materials Processing Technology of Education Ministry State Key Lab of New Ceramic and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China

MXene nanomaterials are one of the most promising electrode material candidates for supercapacitors owing to their high conductivity,abundant surface functional groups and large surface ***,electrodes based on MXene may result in low ion-accessible surface area and blocked ion transport pathways because of the self-restacking of MXene *** is essential to suppress the self-res tacking of nanosheets and increase the electrochemical active sites in order to optimize the *** this work,bidirectionally aligned MXene hybrid aerogel(A-MHA)assembled with MXene nanosheets and microgels is prepared using a facile bidirectional freeze casting and freeze-drying *** bidirectionally aligned structure together with the three-dimensional structured microgels in the A-MHAs,can improve the ionaccessible surface area and provide more barrier-free channels by exposing more active sites and ensuring electrolyte transport *** A-MHA with MXene microgels content of 40 wt%exhibits a high specific capacitance of 760 F·g^(-1)at 1 A·g^(-1)and a remarkable cyclic performance of 97%after 10,000 cycles at100 mV·s^(-1)in 1 mol·L^(-1)H_(2)SO_(4)electrolyte.A-MHAs show remarkable electrochemical properties and are of potential application in energy storage.

关键词： MXene MXene microgels Bidirectionally aligned structure Electrodes Supercapacitors

来源：评论

学校读者我要写书评

暂无评论

Suppression of runaway current by electrode biasing and limiter biasing on J-TEXT

引用

Plasma Science and technology 2022年第12期24卷 7-14页

作者： Lingke MOU Zhongyong CHEN Wei YAN You LI Weikang ZHANG Jiangang FANG Yingzhou JIANG Xiaobo ZHANG Yu ZHONG Feng LI Guinan ZOU Fanxi LIU Zhipeng CHEN Zhoujun YANG Nengchao WANG Yonghua DING Yuan PAN 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 430074People's Republic of China

The avoidance of runaway electrons(REs) generated during plasma disruption is of great concern for the safe operation of tokamak *** study on the suppression of runaway current by electrode biasing(EB) and limiter biasing(LB) has been performed on the J-TEXT tokamak,which could be an alternative way to suppress the runaway *** experimental results show that the higher the voltage value,the smaller the runaway current in both EB and LB *** runaway current can be completely suppressed at an electrode biased voltage of +450 V and a limiter biased voltage of +300 *** comparison of the energy spectra during the runaway plateau phase shows that the maximum energy max(E_(RE)) and radiation temperature T_(HXR)hard x-rays(HXRs)are significantly reduced after the application of +200 V limiter biased *** electric field generated by the biased voltage may be the key factor to suppress the runaway current,and the measured radial electric field increases obviously after the voltage is *** may result in an increase in the loss of REs to realize the suppression of runaway current.

关键词： plasma disruption electrode biasing limiter biasing runaway current

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：