Results 61 to 70 of about 15,391 (174)
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT With the rapid growth demand for advanced integrated electronic systems, lightweight flexible electromagnetic interference (EMI) shielding films integrated with functional properties, such as excellent mechanical properties and self‐healing capability, are a research focus in high‐tech functional materials. Herein, a sandwich‐structured aramid
Dan Guo +9 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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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The transformative potential of gallium nitride high electron mobility transistors (GaN HEMTs) in advancing carbon‐neutral power systems remains bottlenecked by contact resistance (Rc) at the metal–semiconductor (M‐S) interface, a critical determinant of switching losses and frequency response.
Ji‐Zhou Zhang +8 more
wiley +1 more source
The Impacts of Midday Information and Overnight Information on the Volatility of Chinese Stock Market [PDF]
, 2016 信息的传播和扩散是资本市场产生波动的内在动因，我国的股票市场均在白天交易，总交易时间为4小时，仅为全天时间的六分之一。而海内外大部分与金融有关的信息都倾向于在隔夜期间发布，这就会产生相当多的隔夜信息；同时因为我国独特的午间休市制度也会产生较多的午间信息。 上述的各种信息就可能会对我国的股市产生影响，本文尝试用HAR-RV模型来研究午间信息和隔夜信息对中国股票市场波动率的影响；采用水平、方根、对数三种形式，构建午间信息和隔夜信息对中国股票市场影响的HAR-RV模型，Hansen和Lunde(2005 ...
陈兵兵
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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
Research of Underwater Acoustic Communication System based on Linear Frequency Modulated Signal [PDF]
, 2015 水声信道是一种多径效应强、传输延迟高、多普勒效应明显，频率选择性衰落和时间选择性衰落严重的信道。由于水声信道可用的带宽有限，所以通信速率较低，此外，声波在水的介质中传输速率只有1500m/s，即便收发两端发生较小的相对运动也能导致比无线信道更加严重的多普勒效应。 按照信息的传输速率，可将水声通信的类型分为高速通信和低速通信，而按照工作频段分，可将分为高频、中频以及低频通信。高速通信主要应用在近距离的场景，工作频率主要在高频段，一般在几十KHz-几百KHz不等，主要采用的是多载波技术，例如OFDM等 ...
林晓阳
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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
Dianci bileiqi, 1972 工频半波试验设备是用来试验避雷器阀片工频续流下的工频半波通流能力的主要设备。过去国内外一般采用短路发电机或根据振荡原理设计的“高列夫回路”的半波试验设备。这种设备,首先是将工频交流电升压高达几万伏,再经高压整流设备,将高压交流变成直流,蓄存在高压电容器组里,然后再经过电感对被试物件放电,将高压直流转变成近似工频正弦波形,对被试物件进行半波试验 ...
大连电瓷厂
doaj
Consistency of phonetic families and principles of teaching Chinese as a foreign language [PDF]
, 2016 Version of ...
Kim, SA, Shin, SH
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Gaoya dianqi, 2014 为了检验局部放电特高频检测装置的灵敏度,笔者对目前广泛应用的CIGRE方案进行了实验研究。通过对脉冲源发射的特高频信号时域和频域特征分析,检验了脉冲源与实际放电源的等效性。试验发现脉冲源激发的特高频信号峰峰值随输出电压升高呈线性增长,与悬浮金属体作为放电标准源激发的特高频信号峰峰值与放电量的关系曲线类似。笔者结合对GIS中局部放电激发和传播特性的研究,提出了细化CIGRE关于特高频检测系统灵敏度检验草案的建议。
丁登伟, 高文胜, 刘卫东
doaj