Results 21 to 30 of about 990 (108)
Structural Modulation of Magnetic Softness in Fe‐Based Amorphous Alloys via Pulse Current Training
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Fe‐based amorphous alloys, despite their intrinsically low magnetocrystalline anisotropy, suffer from quasi‐dislocation dipoles and localized stress fields that impede domain‐wall motion and increase coercivity. Here, we introduce pulse current training (PCT) as an energy‐efficient technique to overcome these limitations in a Fe76Si9B10P5 ...
Shumin Ye +13 more
wiley +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The inherent trade‐off between high saturation induction (Bs) and low core loss in soft magnetic materials presents a challenge in the development of high‐frequency power electronics. Here, a processing approach that combines accelerated Cu ordering with dual magnetic anisotropy control in high‐Bs Fe‐based nanostructured cores is examined ...
Xiaoying Li +11 more
wiley +1 more source
Gaoya dianqi, 2017 雷害是影响高速铁路安全稳定运行的关键因素之一,研究雷电先导作用下高速铁路周围电场的变化规律对于高速铁路雷击机理的阐明具有重要意义。文中结合先导法建立了高速铁路三维雷击仿真模型;通过调整导体携带电荷量、高度及侧面距离,来模拟不同雷电流幅值以及先导空间位置对高速铁路周围电场分布的影响;并对比分析了高架区段和路基区段高速铁路周围场强分布情况。研究发现,在雷电流幅值为数千安时,高速铁路周围仍有上行先导产生,因此认为在雷击计算中,雷电流较小情况仍需考虑上行先导;随着雷电流幅值、下行先导空间位置的变化 ...
李瑞芳, 金亮
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Gaoya dianqi, 2020 电晕是造成车顶绝缘子老化的主要因素之一。基于高速气流试验平台,试验研究了高速气流电晕环境下硅橡胶表面的憎水性分布,通过分析高速气流对电晕放电路径和放电电流的影响,讨论了憎水性分布发生偏移的原因。研究发现:高速气流环境下电晕强度较大时,憎水性丧失最严重的部位沿气流方向发生偏移。其原因是:当电晕放电沿针尖发展至针板间隙空间时,高速气流使得电晕放电路径沿气流方向偏转。气流速度一定时,离子所受电场力随电压的增大而增大,高速气流不易将其吹离针板间隙空间 ...
张晓青 +4 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem +4 more
wiley +1 more source
New Directions for Child and Adolescent Development, Volume 2026, Issue 1, 2026.Background Working memory updating is crucial in bilingual children′s second language (L2) reading comprehension. A robust updating ability is a cognitive key for children to successfully master L2 reading comprehension. Objective This study is aimed at investigating the effect of updating ability on the L2 Chinese reading comprehension among Uyghur ...
Guangxin Li +3 more
wiley +1 more source
How Many Floods Have Occurred in China in the Past Decade? A Perspective From Social Media
Earth's Future, Volume 13, Issue 4, April 2025.Abstract Global climate change has led to frequent and widespread flood disasters in China. Traditional flood disaster investigations mainly focus on major flood events, and small‐scale flood events are often overlooked. This study utilized the Sina Weibo social media platform to detect flood events in 370 cities in China from 2012 to 2023.
D. Shen +5 more
wiley +1 more source
Dianci bileiqi, 2014 为研究高速铁路接触网雷击过电压的耐受水平,找出其绝缘子发生雷击闪络的主要原因,并分析避雷器在防雷中的实际效果,本文根据高速铁路接触网的典型结构,以电磁暂态分析程序为平台建立了接触网雷电过电压仿真模型。仿真得到了高速铁路雷击后绝缘子两端的过电压幅值,以及避雷器对该过电压幅值的影响规律。发现正馈线的直击耐雷水平略低于接触网导线;由于正馈线安装在线路两侧,对接触导线具有较强的屏蔽作用,绝缘子的雷击闪络率远高于接触导线。雷电感应造成的绝缘子闪络率比直击造成的闪络率要低得多 ...
魏俦元
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Dianci bileiqi, 2017 高速铁路的快速发展伴随日益严重的雷电灾害事故,为了合理保护高铁变电所电气、信号设备,需要研究雷电侵入波对其危害。利用EMTP软件搭建了高铁接触网线模型,分析线路、设备前端安装避雷器防护效果,最后隔离变压器起到设备末端精细保护的作用。仿真结果表明:高铁接触网安装避雷器能够降低接触网过电压,其防护效果与避雷器安装密度、距雷击点距离有关;变电所设备前端安装SPD不能够实现过电压完全防护,残压仍然较高;安装隔离变压器能够进一步衰减侵入波过电压,同时有效抑制过电压高频成分 ...
吴政南, 程远胜
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