Results 31 to 40 of about 15,242 (167)

Recent Advances in Piezocatalysis and Piezo‐Photocatalysis in Energy and Environment: Materials, Design, and Applications

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Piezocatalytic technology utilizes mechanical strain or stress‐induced piezoelectric phenomena to produce robust internal electric fields, markedly improving the separation efficiency of e−‐h+ pairs. This method has emerged as a focal point in catalysis by removing reliance on conventional light or electrical energy via its mechanical‐to ...
Yue Zhou   +5 more
wiley   +1 more source

Simulation and Analysis of the Dynamic Range of the Lunar Radar and A New Algorithm for Surface Medium Electromagnetic Parameters Inversion [PDF]

open access: yes, 2016
探地雷达(GPR)通过向地下发射高频率宽带电磁波来探测地下物体、地层界面以及地下介质属性和分布结构,被广泛应用于经济建设和军事各领域。由于雷达信号会受到各种电磁和背景噪声干扰,使得接收到的信号不能直接准确地反映地下介质信息,造成对目标检测和识别的困难。特别当处于非理想环境条件下,非目标介质反射信号干扰复杂,目标的反射波很难被识别。在对路面、隧道以及地下等检测时,遇到的地下介质多是层状分布的。人们不仅希望获得各层的深度和厚度,还希望得到各层介质的介电常数和电导率等参数。因此,本文将地表层介质作为研究的对象,
俞子伟
core  

Improving the Electrochemical Properties of SiOx/Graphite Anode for High‐Performance Lithium‐Ion Batteries by Ultrathin Lithium Film Prelithiation

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT High‐capacity SiOx/graphite (SiO/G) anodes offer great potential for advancing lithium‐ion battery technology; however, their practical application is limited by low initial coulombic efficiency (ICE) and rapid capacity decay. These challenges primarily arise from unstable phase transitions and the formation of the solid electrolyte interphase
Wan‐Xing Zhang   +14 more
wiley   +1 more source

500 kV直流GIL支撑绝缘子的电场优化

open access: yesGaoya dianqi, 2010
随着电网建设的日益深入,直流气体绝缘金属封闭输电管道(GIL)由于可用在高电压、大容量的场合,用作经济的长距离输电线路而被提上研究日程。直流GIL支撑绝缘子的沿面闪络很大程度上是由表面电荷积聚引起的。直流下GIL的内部稳态电场分布主要受环氧树脂固体绝缘的电导率和形状控制。以500 kV直流GIL为计算模型,借助COMSOL软件,研究了GIL中支撑绝缘子的形状、体积电导率和表面电导率对电场分布的影响。研究认为,半圆锥式绝缘子的电场分布是最优化的,绝缘子的体积电导率对其电场分布影响不大 ...
贾志杰   +6 more
doaj  

Electronic structures and thermoelectric properties of several wide-band-gap semiconductors [PDF]

open access: yes, 2016
由于化石能源的飞速消耗以及人类在应用化石能源过程中造成的环境污染,开发清洁可持续的新能源成为研究热点,热电作为新能源开发中的一员,在研究中遇到的主要问题是材料的热电转换效率难以提高。本文的主要工作是以第一性原理为基础,以SiC,GaN,ZnO等几种宽禁带半导体为对象,研究宽禁带半导体材料结构变化与其热电效率高低的关系。通过Quantumespresso和WIEN2k计算材料的电子结构,再用Boltztrap软件计算材料的热电性质,我们可以比较不同结构的同种化合物热电性质的变化情况,并找出定性的规律 ...
黄政
core  

Ultrahigh‐Strength Soft‐Magnetic NiFeCoAl Multi‐Principal Element Alloys Enabled by Multiscale Heterostructure Design

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Soft‐magnetic materials (SMMs) are indispensable for electrification and sustainable energy systems, yet their inherent mechanical fragility fundamentally limits applications under severe mechanical stresses. Enhancing the yield strength of SMMs is essential to prevent the degradation in magnetic performance and failure from plastic ...
Nairan Wang   +6 more
wiley   +1 more source

覆冰输电导线起舞概率研究

open access: yesZhendong Ceshi yu Zhenduan
针对覆冰输电导线舞动问题,基于概率密度演化法,提出了一种覆冰输电导线起舞概率分析方法。首先,建立了基于临界风速的覆冰输电导线起舞功能函数,结合具有3个平动自由度与1个扭转自由度的三结点索单元的有限元模型与李雅普诺夫稳定性定理,求解了覆冰输电导线起舞临界风速;其次,基于概率密度演化法,发展了一种覆冰输电导线起舞概率评估框架,并进行覆冰输电导线起舞概率的计算与分析;最后,获得了某单跨覆冰导线算例的起舞概率并进行了参数分析。分析结果表明:本研究方法可准确计算该单跨输电导线的起舞概率 ...
doaj   +1 more source

氧化锌阀片与氧化锌材料电导率的关系

open access: yesDianci bileiqi, 2000
提出氧化锌阀片的漏电流与其化工材料的电导率大小有关,在阀片的配方、工艺固定的情况下,组成材料的电导率高,所烧成的阀片的漏电流也相应增加,反之亦然。因此,在选购化工材料时,把控制材料的电导率应作为一项重要指标。
荆久长, 张长军, 张金秀, 田政
doaj  

Finite Element Analysis for Maxwell's Eigenvalue Problems [PDF]

open access: yes, 2016
在微波工程中,波导和谐振腔都是十分重要的微波器件,这些微波器件广泛地用于 我们的现实生活中.在波导问题中,如果电磁波的频率给定,那么传播常数就是一个非常重要的物理参数.在谐振腔问题中,谐振频率是一个十分重要的物理参数.当波导横截面不规则或者填充有非均匀介质时,此时波导问题的解析解是很难找到的;当腔体的几何结构十分复杂或者填充有非均匀介质时,此时谐振腔问题的谐振频率的精确解也是很难找到的.但是我们往往需要知道这些微波工程器件的这些物理参数,所以通常采用数值方法去近似求解它们 ...
姜威
core  

Effect of Worm‐Like Amorphous Phase on Corrosion Resistance and Antibacterial Properties of NiTiCu Alloy

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT By adding CuO, the worm‐like amorphous phase and atomic clusters were simultaneously introduced, enabling the (Ni40Ti40Cu20)99.9O0.1 alloy micron columns to exhibit a uniform flow strain of over 40% and a strength of over 2.5 GPa during compression.
Huwen Ma   +13 more
wiley   +1 more source

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