Results 51 to 60 of about 22,109 (197)
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, 2018 高频变压器在提升电能传输效率的同时,也会加速油纸绝缘系统缺陷的劣化进程。为研究油纸绝缘系统在高频电压下的劣化特性,采用柱板模型模拟油纸绝缘的沿面放电缺陷,搭建高频局部放电试验平台,在10、20、30 k Hz电压下采用恒压法进行多组局部放电试验。利用摄像机和罗氏线圈分别记录试验现象和放电信号,分析高频电压下局部放电图谱和产气特性,并与工频局部放电试验的结果进行对比。结果表明:随着频率的提高,油纸绝缘系统的局部放电起始电压显著降低,单位时间内关键气体的产气量明显提高;但在高频电压下 ...
刘思华 +5 more
doaj
Technology development in nano-sized photocatalyst powder preparation technologies [PDF]
, 2006 Nano-sized semiconductor powders for use as photocatalysts have great potential in environmental and energy engineering applications. The photocatalytic activity of photocatalyst is significantly affected by preparation process since the crystalline ...
Leung, DYC, Leung, MKH, Ni, M
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Orbitally Driven Anomalous Thermal Transport Under High Pressure in Gallium Nitride
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Extreme conditions such as high pressure offer opportunities for innovative materials design and applications. For over a century, studies on thermal transport in crystals under high hydrostatic pressure have shown that lattice thermal conductivity generally exhibits a monotonic increase with pressure.
Zong‐Hao Yuan +8 more
wiley +1 more source
Cross-cultural Comparative Analyses of Media Texts: A Corpus-based Study of Articles About Climate Change from Five English Newspapers [PDF]
, 2016 全球气候变暖问题相比较而言难以被公众直接感知，大众媒体将相关信息传递给公众，起着桥梁纽带作用。进入21世纪，全球气候变暖问题持续升温，引起国际社会的普遍关注。各国科学界和政界都积极推动，力图提高公众的参与意识，共同应对全球气候变化带来的挑战。虽然气候变化可以被科学家和科技专业人员准确测度，但却难以被公众直接感知。不可否认，全球气候变暖问题对公众来说，往往捉摸不定、变化莫测。公众对其感触不深，认知不切。所以，科技专业人士和公众之间存在信息不对等问题。就该问题而言，媒体的作用极为特殊 ...
张爱真
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MXene‐Based Electromagnetic Attenuation Materials in Microwave and Terahertz Bands
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT MXenes exhibit considerable potential for developing high‐performance electromagnetic (EM) shielding and absorption materials operating across microwave and terahertz frequencies, due to their tunable surface chemistry and exceptional charge carrier transport properties.
Guozheng Zhang +9 more
wiley +1 more source
滴灌频率和施氮量对温室西葫芦土壤水分、硝态氮分布及产量的影响
Shuitu Baochi Xuebao, 2018 2016年和2017年在北方寒旱地区日光温室西葫芦栽培中，灌溉定额为269.87 mm，设置2个滴灌频率（低频W1：7天1次，高频W2：2天1次）和2个氮素水平（适氮N1：375 kg/hm2，高氮N2：565 kg/hm2），研究不同处理对温室西葫芦土壤水分、硝态氮分布及西葫芦产量的影响。结果表明：（1）高频（W2）滴灌提高了0—40 cm土层的土壤水分，减少了水分的深层下渗。（2）高氮（N2）施肥各土层硝态氮含量较高，适氮处理配合高频次滴灌根区0—40 cm硝态氮含量维持在相对适宜水平，40—80 ...
郭鹏飞 +4 more
doaj
The Influence of Restricting Index Futures Trading on China’s A-Share Market Pricing—The Empirical Analysis Based on High Frequency Data [PDF]
, 2016 股指期货作为成熟资本市场中不可或缺的一部分，在风险对冲、价格发现等方面发挥了巨大的作用。我国股指期货市场起步较晚，直到2010年4月16日才推出了我国第一只以股票指数作为标的资产的期货产品——沪深300指数期货。而在这之前，新加坡交易所于2006年9月率先推出了以富时中国A50股票指数为标的物的股指期货——富时中国A50指数期货，并曾在长时期内主导着我国A股市场的定价权。自沪深300指数期货推出以来，经过多年的发展，我国在A股市场定价权竞争中已占据优势。2015年6月，我国A股市经历了一场“股灾 ...
肖东东
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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
Study of L-band High Frequency Surface Acousitc Wave Sensors Based on E-Beam Lithography [PDF]
, 2015 谐振型声表面波传感器因具有体积小、测量精度高、易于无线无源化等特点，能够胜任封闭狭窄环境及高速转部件等复杂条件下的温度、压力、振动、湿度、应变等环境参数的测量。目前，谐振型声表面波传感器多工作在P波段，器件和天线的尺寸相对较大，灵敏度相对较低。为满足无线传感网络对传感器件微型化和无线无源化的需求，有必要对工作频段更高、特征尺寸为亚微米量级的谐振型声表面波传感器的设计和制造开展深入研究。 本文首先阐述了谐振型声表面波传感器的核心部件—声表面波谐振器(SAWR)的工作原理 ...
张鸿
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