Results 21 to 30 of about 484,485 (153)
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT To break electromagnetic wave absorption (EMA) tech's single‐attenuation bottleneck, enhancing multi‐wave absorption synergy in composites is key for microstructure design. This study uses mesoporous hollow carbon spheres to make metal nanospheres with cobalt, iron, and nickel nanoparticles, then encapsulates them via electrospinning into a ...
Wei‐Lian Zhang +10 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT This study developed a FeSiAl@LMPGP composite material to address the demand for low‐frequency electromagnetic absorption. Through controllable heat treatment, FeSiAl particles and PbO nanoparticles self‐assembled into a high‐density Mott–Schottky heterointerface structure, which exhibited a significant built‐in electric field (BIEF) effect ...
Yuqi Wang +5 more
wiley +1 more source
Gaoya dianqi, 2016 为了消除MOA表面污秽导致绝缘在线监测系统介质损耗角测量值产生的误差,文中用盐雾法对避雷器进行人工污秽试验,通过试验数据研究表面污秽程度与介质损耗角测量误差之间的关系,得出基于最小二乘法的介质损耗角修正方法。采用该方法可根据避雷器的污秽程度（等值盐密值）,得出介质损耗角修正值,使修正后的测量值更接近真实值。实验室试验结果表明,该方法对于表面污秽产生的测量误差,具有良好的抑制效果,显著提高了介质损耗角的测量精度。
任明辉, 王新龙, 杨可, 付银仓
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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 +9 more
wiley +1 more source
Gaoya dianqi, 2012 受测试设备输出容量局限性的影响,目前电力系统中的一些大电容量电气设备（如发电机、电力电缆等）的现场介质损耗测试非常困难。笔者研制的介质损耗测试装置可实现大电容高电压设备的现场介质损耗和电容量测试,最大电容量测试达到2.5μF。整套装置具有运输方便、抗干扰性能强、自动化程度高、测试数据准确、重复性好的特点,已成功应用于现场电力电缆以及发电机绕组介质损耗的测试。
刘曦 +4 more
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Optimized combination detection for microwave ceramic dielectric resonator measurement [PDF]
, 2008 [中文文摘]微波介质陶瓷材料的介电性能主要由3个参数表示:介电常数、介质损耗和谐振频率温度系数。本文优选组合了3种检测介质谐振器方法:短路型介质谐振器轴向的短路界面测定方便准确,用于测量微波介质陶瓷材料的相对介电常数;开路型平行板与介质谐振器无直接接触,用于测量介质损耗系数;自行研制的旋转开放腔,可同时放置多个样品,加快温度系数的测量速度。3个参数采用3种不同测试法,充分应用了不同测试法各自的优势,满足微波介质陶瓷材料介电常数跨度大、介质损耗低、温度系数快速测量的需求,可得到精确、快速的测试效果 ...
陈赐海(漳州师范学院物理系) +3 more
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The central challenge in the development of high‐performance electromagnetic wave‐absorbing materials lies in achieving an optimal balance between impedance matching and attenuation characteristics. This is particularly critical for purely dielectric absorbers, where precise tailoring of the real (ε′) and imaginary (ε″) parts of the complex ...
Zhixiao Wang +7 more
wiley +1 more source
空间干扰对电容式套管介质损耗因数（tanδ）测量结果影响的分析
Gaoya dianqi, 2008 空间干扰对现场试验中出现的电容式套管介质损耗因数tanδ可造成影响,使其偏小甚至出现负值。针对这一问题,笔者进行了分析研究,并提出了相应的建议:在现场进行电容性套管的介质损耗测量时,必须认真分析空间干扰网络的影响,以防止介质损耗因数的测量误差,保证测量结果的准确性。
苏煜, 张燕涛, 王薇
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Dianci bileiqi, 2004 介绍了安装后的油纸电容式变压器套管介质损耗角的测量方法;举例分析了影响介质损耗角测量的因素;指出要加强对套管的维护和管理,并采取正确的测量方法,以保证套管和变压器的安全运行。
范建二, 何平, 闵健
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Gaoya dianqi, 2008 使用谐波分析法对介质损耗因数进行在线监测时,由电网频率波动引起的非同步采样会给系统测量带来很大误差。为实现介质损耗角的高精度测量,笔者结合现在数字信号处理芯片的处理能力,提出了加布莱克曼窗的插值DFT修正算法来分析介损的测量,并根据介损角的定义进一步对由插值算法得到的介损进行了修正。仿真结果表明,该算法得到的介损误差较小,精度受频率的波动影响较小,对介质损耗角的在线测量有一定的参考价值。
邱海锋, 周浩
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