Results 21 to 30 of about 8,387 (117)
Dianci bileiqi, 2020 接地体短路温升是校核接地材料短路耐受性能的重要指标,但目前的短路温升计算方法主要在无散流、无传热的空气环境中进行,校核结果未能充分反映接地导体在土壤中的温升特性。笔者采用电磁-温度耦合有限元计算方法模拟短路电流作用下接地导体的散流及地中温升过程。研究发现接地体轴向地中短路温升分布具有两端高中间低的特点,且由于土壤发热与本体发热共同作用,接地体两端温升显著高于空气环境短路温升。同时,土壤电阻率增大及趋肤效应会进一步加剧端部温升。随后结合侵蚀算法模拟了接地导体的过热失效 ...
吴泳聪, 阮江军
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Lightweight refractory medium‐entropy alloys (LRMEAs) are promising for high‐temperature structural applications, yet achieving a robust strength‐ductility balance across a wide temperature range remains challenging. We report a Ti50Al16.7Nb16.6V16.7 (at.%) LRMEA featuring a BCC matrix reinforced by nano B2‐ordered domains, exhibiting ...
Minghui Li +10 more
wiley +1 more source
Gaoya dianqi, 2015 传统交流温升试验电源系统采用电网直接供电,因此只能进行50 Hz温升试验,而无法实施60 Hz温升试验,同时,由于其自动化程度较低,在电网电压波动以及负载随温度变化的情况下,只能通过现场手动调节调压器实现电流的稳定控制,且缺乏有效的远程监控手段,不利于系统运行的综合管理。为解决上述问题,笔者结合温升试验的工艺要求以及试验室的具体试验条件,采用发电机作为温升试验电源,通过调节变频器的输出频率改变拖动电动机的转速,实现了试品对不同试验频率的需求;采用可编程控制器设计了一套温升试验自动控制系统 ...
贾一凡 +6 more
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采用4种不同纵磁触头结构的126kV单断口真空断路器温升性能对比研究
Gaoya dianqi, 2021 为进一步提升126 kV单断口真空断路器额定通流能力,文中针对4种采用不同纵磁触头结构的126 kV真空断路器的温升特性通过仿真进行了对比研究。4种纵磁触头分别为2/3、3/4匝线圈型、马蹄铁型和开槽马蹄铁型纵磁触头。有限元仿真结果表明在通流3 150 A时4种触头的热态交流电阻分别为30.2、36.9、24.0、16.3μΩ。4种断路器整机的温度分布采用有限体积法计算得到,温升仿真模型由通流2 500 A下的实验结果验证。结果表明,仿真模型在灭弧室周围的5个测温点内计算误差小于10 ...
马朝阳 +6 more
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Achieving rapid and selective separation of anode and cathode materials remains a critical challenge in the recycling of spent lithium‐ion batteries. This study develops a microwave‐enhanced flotation strategy for the efficient recovery of cathode and anode materials.
Peiyuan Ye +5 more
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Two‐dimensional Mn‐based MBenes remain challenging to synthesize due to structural instability during etching. Herein, Mn2AlB2 was employed as a precursor to systematically investigate Al removal via HF, NaOH, and a gas–solid route using PVDF‐derived HF.
Tao Zhong +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Lignin hydrogenolysis is a promising route to separable aromatic monomers, yet practical upgrading is still hindered by macromolecular mass‐transfer limitations and the aggregation/deactivation of metal sites. Herein, we propose a “dual‐confinement” strategy to construct ultrafine Ru nanoclusters supported on lignin‐based N‐doped hierarchical ...
Tianjin Li +11 more
wiley +1 more source
基于NEX-GDDP-CMIP6的不同温升情景下中国气候要素变化
Shuitu Baochi Xuebao目的全球温升对气候系统具有持续性影响，深入理解不同温升情景下气候要素的变化趋势及其空间分布特征，有助于为制定差异化的气候适应策略提供科学依据。方法基于NASA Earth Exchange Global Daily Downscaled Projections （NEX-GDDP-CMIP6）高分辨率数据，评估全球温升1.5~5.0 ℃情景下中国气候要素的变化，重点分析6个关键气候变量的变化趋势及空间分布。结果中国陆地增温速率高于全球平均水平，且相对增幅随全球温升呈加剧趋势。当全球温升1.5 ℃时 ...
温姗姗, 汪辰钰, 翟建青, 周彪
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Time‐Efficient Columnar‐to‐Equiaxed Transition via High Magnetic Field Processing
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT The need to simplify processing routes and improve processing efficiency motivates the development of time‐efficient methods for inducing the columnar‐to‐equiaxed transition (CET) during solidification while tailoring material performance. Conventional multistep CET approaches are time‐consuming and often struggle to simultaneously regulate ...
Chendong Zhao +12 more
wiley +1 more source
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT In laser‐directed energy deposition (LDED) of TiC/Ti6Al4V composites, a low content of micron‐sized TiC provides a good strengthening effect on hardness and strength, but the improvement in plasticity remains a challenge. By introducing synchronous ultrasonic impact treatment (UIT) into the LDED process, an ultrasonic‐assisted LDED (UA‐LDED ...
Yuzhou Zeng +9 more
wiley +1 more source