Results 41 to 50 of about 1,534 (162)
Study on Corner-Fed Cavity-Backed Slot Dual-Polarized Antennas [PDF]
, 2015 为了在2.4GHz频段WLAN中实现具有方向性辐射的MIMO技术，采用背腔环形缝隙结构辐射元，通过倒置正交微带线激励，设计具有一定方向性的正交双极化天线结构。为提高端口间的隔离度和辐射场的极化纯度，在馈线正对的另一侧共面加载尺寸完全一致的接地或不接地导体带条。在此基础上，采用角馈的方法以期进一步改善天线的性能，并对各种可能天线形态进行对比分析。具体内容如下。 （1）对于边馈情形（即馈线位置垂直平分矩形导体腔表面的直角边），可以发现，没有加载导体条时，较佳隔离度对应的频带要高于阻抗工作频带，且相隔距离较大。
谢昇
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Fluxgate sensors with Co‐rich amorphous microwires, widely used for their low noise in magnetic field measurements, encounter significant challenges in high‐temperature environments such as well drilling and geological exploration. Prolonged thermal aging degrades the performance of Co‐rich amorphous microwires, resulting in increased noise ...
Lining Pan +10 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 1997 摘 要 作者研究了增强型体外反搏器的电磁兼容性特征, 测试并分析了增强型体外反搏器对周围电磁 环境的影响,以及周围电磁环境的各因素对反搏器正常工作的电磁干扰及其影响程度,为医学电子仪器适应周 围电磁环境,提高自身抗扰度提供了实验依据。
李海云 郑振声
doaj
Recognition method based on hesitant fuzzy set for unequal length sequences and its application [PDF]
, 2021 Aiming at the problem that unequal length sequences were difficult to recognize, a recognition method based on hesitant fuzzy distance measure was proposed.Firstly, the problem was described from the perspective of fuzzy value, and the hesitant fuzzy ...
Guidong SUN, Shuangming LI, Xin GUAN
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang +4 more
wiley +1 more source
Gaoya dianqi, 2010 电磁环境是制约电网建设和发展的一个重要因素。研究输电线路电磁环境影响因素及其防护对策,可以为输电线路的设计提供技术依据,使人们正确认识输电线路电磁环境并合理选择防护对策。为此,笔者基于等效电荷法,研究了输电线路对地高度、双回路导线相序布置、等效半径、单回路导线布置方式、相间距离等因素对500kV超高压输电电磁环境的影响,并根据研究结论和相关研究成果提出了主动防护和被动防护等具体的防护对策。
王广周 +4 more
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Study on Modification of Wave Absorbing Ability of Silicon Carbide [PDF]
, 2015 碳化硅具有化学性质稳定、耐高温、耐化学腐蚀、强度高、导热系数高、热膨胀系数小的特点，不仅仅被广泛应用在功能陶瓷、高级耐火材料、磨料及冶金原料等民用领域，还应用于航空航天领域，用作发动机的热端部件。但是，有机先驱体转化法制备的SiC陶瓷电阻率高，对电磁波吸收效率不高。然而，对SiC进行电磁性能改性是该材料具有雷达隐身性能的基础。因此将铁、钴和碳等引入到碳化硅中，提高其介电损耗和磁损耗，进而提高其吸波性能，对发展功能化SiC陶瓷具有重要的意义。 本文选取易石墨化、碳化产率高且价格便宜中间相沥青作为碳源 ...
丁绍楠
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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 +8 more
wiley +1 more source
±800kV/±500kV混压双回直流线路的电磁环境分析及改善研究
Gaoya dianqi, 2016 ±800 kV/±500 kV混压双回直流输电线路可解决中国日益增长的电力需求和输电走廊资源紧缺的矛盾,但目前尚无建造和运行经验,研究其电磁环境具有重要工程指导意义。文中采用解析法、CISPR和BPA经验公式法等方法,计算了两种基本塔型及相应导线布置方式下的导线和地线表面场强、地面电场和离子流密度分布、线路最小对地距离和走廊宽度、可听噪声和无线电干扰等电磁环境相关指标,分析了不同因素（导线排列方式、导线高度、线间距离等）对电磁环境的影响,并与±800 kV直流单回线路和±500 ...
李凌燕 +5 more
doaj
, 1996 厦门饮用水有机污染物危害的研究厦门市卫生防疫站高振华，梁荣春国家海洋局第三研究所郑金树厦门大学抗癌研究中心于侣仙，廖绵初许多研究表明，城市饮用水中存在着致突变的有机物，它们来源于水源水的污染、饮水氯化消毒的副产物三卤甲烷（THM3）等。因此，近年来饮..
于侣仙 +4 more
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