Results 11 to 20 of about 4,432 (109)

考虑后续雷击的高压架空输电线路雷电过电压研究

Dianci bileiqi, 2022
架空输电线路遭受雷击会出现很高的暂态过电压，国内外学者对输电线路的首次雷击暂态响应作了大量计算，但未见分析考虑后续雷击的影响。为了全面分析雷击对输电线路的影响，建立了考虑后续雷击输电线路模型，采用该模型对线路暂态电位进行了计算；对比分析了其遭受首次雷击和后续雷击两种情况的暂态电位波形。结果表明：绕击时后续雷击在输电线路上产生的雷电过电压比首次雷击高15.14%;过电压上升时间约等于首次雷击的一半，后续雷击输电线路的危害比首次雷击大；雷击杆塔塔顶时，首次雷击比后续雷击在输电线路中所产生的过电压高一倍左右 ...
罗楚楠, 张胜, 黄一威
doaj  

A Domain‐Specific Terminology for Retinopathy of Prematurity and Its Applications in Clinical Settings

Journal of Healthcare Engineering, Volume 2018, Issue 1, 2018., 2018
A terminology (or coding system) is a formal set of controlled vocabulary in a specific domain. With a well‐defined terminology, each concept in the target domain is assigned with a unique code, which can be identified and processed across different medical systems in an unambiguous way.
Yinsheng Zhang, Guoming Zhang, Van C. Lansingh   +2 more
wiley   +1 more source

Large Cation‐Induced Lattice Distortion in Carbon‐Based High‐Entropy Oxides: Spin‐State Engineering and Broadband Microwave Absorption

Rare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT High‐entropy oxides (HEOs) are promising for microwave absorption but suffer from a trade‐off between impedance matching and attenuation, often requiring high filling ratios (> 50 wt%). Herein, we propose a “lattice‐spin” dual‐regulation strategy by introducing giant‐radius Bi into a single‐phase HEO solid solution.
Junwei Zhang, Yuxin Guo, Shengyuan Li, Yifei Wang, Kenan Zhang, Changrui Cao, Shixuan Zeng, Ziqi Yang, Yazhuo Zhang, Yongpeng Zhao, Gaihua He, Peng Liu   +11 more
wiley   +1 more source

Synergistic Modulation of Magnetic and Dielectric Properties via La‐V Co‐Substitution in Barium Hexaferrite for Advanced Millimeter‐Wave Absorption

Rare Metals, Volume 45, Issue 6, June 2026.
ABSTRACT The growing deployment of high‐frequency electronic systems has intensified the demand for high‐performance microwave absorption materials. In this work, we developed La‐V co‐substituted barium hexaferrites, Ba1‐xLaxFe11.9V0.1O19 (BLFVO), via a sol‐gel route.
Zhihui Yang, Jiewu Cui, Pengjie Zhang, Song Ma, Wei Sun, Xiaohui Liang, Yong Zhang, Yucheng Wu   +7 more
wiley   +1 more source

Multi‐Walled Carbon Nanotube‐Penetrated Metal–Organic Framework‐Derived TiO2/C 3D Conductive Network Achieves Lightweight, Wide‐Band, Ultra‐Strong Electromagnetic Wave Absorption

Rare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT In recent years, materials capable of achieving efficient electromagnetic wave (EMW) absorption over a broad frequency range have attracted widespread attention. Such materials are not only significant in mitigating electromagnetic interference and pollution caused by the extensive use of electronic devices but also demonstrate outstanding ...
Maoxia Lu, Zhi Lei, Teng Zhou, Daohai Zhang, Yupeng Hu, Dongju Liu, Junlei Wang, Wei Gong   +7 more
wiley   +1 more source

Hierarchical Strengthening Design in AlCrCuFeNi2.5/CuCrZr Composites Enables Strength–Ductility–Conductivity Synergy

Rare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Developing Cu‐based composites that simultaneously achieve ultra‐high strength, ductility, and electrical conductivity remains critical for advanced electrical contact applications. In this work, multiphase AlCrCuFeNi2.5 high‐entropy alloy (HEA) reinforcements are incorporated into CuCrZr matrix via spark plasma sintering (SPS) and annealing ...
Tao Hong, Jie Chen, Hongmei Chen, Xinxin Yang, Binbin He, Wenjun Lu, Zeyun Cai, Weizong Bao, Guoqiang Xie   +8 more
wiley   +1 more source

Coral‐Like Yolk–Shell‐Structured CoNi@Void@C Microspheres for Enhanced Microwave Absorption, Photothermal, Anti‐Corrosion, and Radiation Shielding Properties

Rare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT Considering the multiple challenges faced by stealth coatings in complex service environments, the development of multifunctional integrated microwave absorbing materials (MAMs) that combine efficient electromagnetic (EM) attenuation with environmental tolerance has become an urgent need. In this work, coral‐like CoNi@Void@C microparticle (MP)
Jiale Wu, Kaizhao Wang, Kaijun Wang, Hyeona Park, Jangyeon Hwang, Junkai Li, Yafei Wang, Jin Hu, Shizhao Xiong   +8 more
wiley   +1 more source

避雷器耐受输电线路雷电绕击的能力分析

Dianci bileiqi, 2001
对雷电绕击输电线路时 ,线路避雷器的雷电放电电流及吸收的雷电放电能量进行了分析计算。分析表明 ,绕击时避雷器能够耐受雷电作用时的放电电流和吸收的雷电放电能量。
何金良, 姜舟
doaj  

Template Engineering of Magnetic Nanoparticles Decorated on Porous Carbon for High‐Performance Multiband Electromagnetic Wave Absorption

Rare Metals, Volume 45, Issue 1, January 2026.
ABSTRACT Although magnetic carbon materials possess significant potential in the field of electromagnetic wave absorption (EWA) due to the synergistic effect of multiple attenuation mechanisms, the currently reported magnetic carbon EWA materials face some challenges, such as high cost, low yield, and easy agglomeration of the magnetic component ...
Bo Jiang, Chen Zhang, Wang Yang, Shao‐Xiong Du, Shuang Liu, Jun‐Yan Dong, Bo Long, Pan Yan, Rui Mao, Yong‐Feng Li   +9 more
wiley   +1 more source

配电线路雷电感应过电压的避雷器防护分析

Dianci bileiqi, 2019
雷电感应过电压导致配电线路发生跳闸或故障的比例要远高于雷电直击,因此需要分析采用线路避雷器对配电线路感应过电压的防护效果。利用EMTP软件编程计算线路雷电感应过电压,分析安装线路避雷器对感应过电压的防护效果,讨论雷电流幅值和雷击点距线路距离、避雷器安装间距、接地电阻对避雷器抑制感应过电压效果的影响。分析结果表明:配电线路安装线路避雷器后能够在一定程度抑制雷电感应过电压;雷电流幅值越高、雷击点距线路近,避雷器抑制感应过电压的效果越弱;避雷器安装间距影响对感应过电压的防护效果,安装越密 ...
罗永志, 王艳辉
doaj