Results 31 to 40 of about 5,771 (125)
Bioinspired 3D‐Printed NiTi Metamaterials With Bivalve‐Like Crossed‐Lamellar Structures
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metamaterials demonstrate unique mechanical properties and functional performance owing to their distinctive topological spatial structures. In this study, by mimicking the natural Saxidomus purpuratus shell, bioinspired crossed‐lamellar architectures with interlamellar apex angles ranging from 60° to 150° were designed and fabricated in NiTi ...
Yu Chen +9 more
wiley +1 more source
Dianci bileiqi, 2011 悬挂式有外串联间隙金属氧化物线路避雷器（以下简称有串联间隙避雷器）是输电线路防雷的重要设备。近年来有串联间隙避雷器在输电线路上得到了广泛应用,研究有串联间隙避雷器的工作特性十分重要。借助比例元件试验对有串联间隙避雷器放电特性、间隙放电特性和本体V-A特性进行了研究,探究了三者间的关系,试验结果表明:工频电压下,有串联间隙避雷器间隙与本体主要依据其等值电容分压;雷电冲击电压下,整体放电电压与间隙放电电压和本体V-A特性有关,电压波陡度越大,本体V-A特性影响越大,前两者的差距越大。
张青蕾, 郭洁, 余芳, 金青
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT This study presents an assessment of four representative expansive additives—calcium sulphoaluminate–calcium oxide, magnesium oxide, sodium lauryl sulfate, and sodium abietate—and their effects on the expansion behavior, mechanical development, and microstructural characteristics of cemented paste backfill (CPB).
Lijie Guo +5 more
wiley +1 more source
Dianci bileiqi, 1974 在单个火花间隙的恢复强度不足以保证避雷器灭弧性能的情况下,可以采用接入火花间隙的特殊方案。在此方案中,同单个火花间隙相比较,达到了提高多个火花间隙的恢复强度。有两种这样的方案在避雷器生产实践中得到了推广:用不同非线性的电阻使火花间隙不均匀分路的方案和应用点火间隙的方案。
段庆成
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
wiley +1 more source
Zhendong Ceshi yu Zhenduan针对叶尖间隙测量，建立了多截面叶尖间隙测量与验证模拟转子试验台，开发了多通道叶尖间隙在线测量软件。首先，基于激光三角法通过定制的双光纤传感器进行叶尖间隙测量；其次，利用高精度位移平台改变叶尖间隙值，在不同转速下测出精准的叶尖间隙值；最后，针对双光纤传感器测量叶尖间隙的采集卡触发阈值电压问题，设计了多通道一体化电压比较器，消除了双光纤传感器两通道同时测量所带来的10-5 s量级的时间差异。结果表明：该方法基于叶尖定时原理，仅测量叶尖到达时刻即可计算出叶尖间隙；各组间隙平均值误差在5%以内 ...
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Zhongguo shiyan zhenduanxue, 2022 的感染,以腰椎最常见。临床表现为发热、患处疼痛压痛和肌肉痉挛,伴或不伴周围神经损害。疼痛于体位变换时加重[1-3]。发病机制以血行感染最常见[1-2]。椎间隙感染可分为特异性椎间隙感染和非特异性椎间隙感染。结核杆菌、布氏杆菌、真菌、寄生虫引起的感染为特异性椎间隙感染;其余病原菌引起的感染为非特异性椎间隙感染[1-4]。特异性椎间隙感染在病史、病理变化、影像表现、临床表现方面与非特异性椎间隙感染差异明显,易于分辨[1-3]。非特异性椎间隙感染的病原菌常是单一的[2],血培养阳性率最低可达24.4 ...
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The Schottky barrier height (SBH), which serves as a pivotal determinant of charge carrier injection efficiency in electronic devices, critically governs electrical behavior at metal/semiconductor interfaces. However, pronounced metal‐induced gap states at metal contact interfaces induce Fermi‐level pinning, which constrains the ...
Xiaofei Liu +10 more
wiley +1 more source
Gaoya dianqi, 2018 为研究交流电压下含有电位悬浮导体的组合空气间隙放电特性,文中以棒—板组合空气间隙模型为研究对象,实验研究了悬浮导体的空间位置对组合间隙放电过程的影响。研究表明,悬浮导体位于高压电极或接地电极附近,短间隙在较低电压下首先被电弧短接,随着电压继续增加,整个间隙完成击穿;悬浮导体位于间隙中部,电压达到临界值时,多个间隙几乎同时击穿。电场仿真表明,悬浮导体引起的空间电场畸变是影响组合间隙放电过程的主要原因。在此基础上,通过实验进一步研究了悬浮导体长度、位置,高压电极和接地电极形状对击穿电压的影响 ...
王胜辉 +6 more
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基于拓展Volume-Time理论的串联空气间隙非同期击穿过程分析
Gaoya dianqi为了认识串联空气间隙的击穿过程，以球—球间隙为研究对象，设计了“非对称组合间隙”，即总间隙距离不变的条件下分别单独调整两个间隙的距离使上下间隙距离不一致。采用拓展Volume-Time理论计算了串联双间隙的U50%，并解释了雷电冲击电压下非对称组合空气间隙的非同期击穿物理过程。实验结果表明，上下间隙距离分布不均匀程度对串联空气间隙击穿电压和击穿延时的影响；不均匀程度较大时，较低电压下存在单个间隙放电、总体不击穿的现象，较高电压下两间隙将出现非同期击穿；不均匀程度较小时，两间隙同期击穿。为了解释这种现象 ...
姚晓飞 +7 more
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