Results 21 to 30 of about 1,086,744 (168)
Gaoya dianqi, 2019 文中针对介质阻挡放电呈现的极性效应,研究了基于放电李萨如图的方法,提出以极性效应参数k来定量表征极性效应的强弱。在高频和工频两种条件下对不同网格密度的丝网电极和平板电极进行了实验研究,结果表明单介质的丝网电极k值较大,双介质的平板电极k值较小;随着频率和电压的升高,k值减小,极性效应减弱。上述结果表明参数k值能够有效用于极性效应的研究。
李兴旺, 叶齐政
doaj
Visible‐Light‐Excited Optical Thermometry in Ca3Sc2Si3O12: Er3+ via an Efficient Eu2+ Bridge
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Er3+ ions are promising for optical thermometry due to their thermally coupled levels. However, their parity‐forbidden transitions result in weak and narrowband absorption, which restricts excitation to infrared lasers (e.g., 808, 980, or 1550 nm). Moreover, the single emission center inherently limits temperature sensitivity. In this work, we
Yi Liu +6 more
wiley +1 more source
Gaoya dianqi, 2016 文中对SF6/N2混合气体在不均匀场下的击穿特性展开研究,通过测量棒—板电极在不同电极间距、混合比、压强下的正、负极性击穿电压值,分析电场不均匀度及气体压强对SF6/N2混合气体极性效应的影响。研究结果表明:在0.1 MPa时,击穿电压随着电极间距的增大而增大,N2负极性的击穿电压高于正极性的击穿电压,在电极间距为12 mm时,负极性击穿电压是正极性击穿电压的1.71倍,而SF6气体与N2极性效应相反,表现为正极性的击穿电压略高于负极性的击穿电压;电极间距为4 mm时,随气体压强的升高负极性击穿电压增大,
陈会利 +4 more
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Recovering Critical Elements From Wastewater for Battery Materials: A Review
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Driven by global carbon neutrality goals, the transition toward a circular economy and sustainable resource management has become increasingly imperative. Given the indispensable role of battery technologies in modern energy storage systems, strategic elements such as lithium (Li), cobalt (Co), and nickel (Ni)—identified by the European ...
Ting Lei +5 more
wiley +1 more source
Dianci bileiqi, 2018 针对氧化锌压敏电阻直流作用下的老化问题。利用氧化锌压敏电阻肖特基势垒理论,对氧化锌压敏电阻在正极性和正、负极性直流交替作用下,氧化锌压敏电阻老化规律进行研究,得出以下结论:1)氧化锌压敏电阻在单一极性直流作用下,产生明显的极性效应。此外,极性效应和老化程度均随电流的增加而增大,当达到最高点时,出现减慢的现象。2)正、负极性电流交替作用时,ZnO压敏电阻出现极性补偿现象,使得肖特基势垒高度下降变慢,导致压敏电阻老化程度较单一极性电流作用下缓慢。
苑吉河 +4 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable Zn‐based alloys are promising candidates for temporary implants, yet excessive Zn2+ release during degradation may induce cytotoxicity and adverse tissue responses. In this study, Zn‐xBa alloys (x = 0.1 wt%, 0.5 wt%, 1.0 wt% and 3.0 wt%) were developed to achieve controlled corrosion behaviors with improved biocompatibility.
Liu‐Dang Fang +9 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2018 【目的】探讨心理弹性及自尊两个积极心理因素在缓解慢性耳鸣患者情绪困扰中的作用，为耳鸣的临床管理提供新思路。【方法】通过心理弹性量表、自尊量表及抑郁-焦虑-压力简表了解慢性耳鸣患者的心理弹性、自尊、抑郁、焦虑及压力水平，再运用SPSS 24.0对入组的124名受试的数据进行相关分析及中介效应分析，最后运用AMOS 24.0进行结构方程模型验证。【结果】①绝大部分患者并无严重的情绪困扰，心理弹性、自尊、抑郁、焦虑及压力均无显著的性别间差异（P > 0.05）；②心理弹性、自尊与抑郁 ...
戚敏 +6 more
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Interventions to Reduce Child Poverty and Its Determinants: A Rapid Overview of Reviews
Poverty &Public Policy, Volume 18, Issue 2, June 2026.ABSTRACT Despite evidence for various child poverty reduction strategies, there is ambiguity regarding the most effective types to inform policy. Thus, we conducted an overview of reviews to systematically identify, appraise, and synthesize interventions for reducing childhood poverty in high‐income country settings.
Omar Dewidar +9 more
wiley +1 more source
, 2022 提供了一种场效应晶体管，包括：衬底；源极层，其位于所述衬底上；漏极层，其位于所述衬底上；沟道层，其电连接所述源极层和所述漏极层；栅极介电层，其位于所述沟道层的远离所述衬底的一侧；半导体性栅极层，其位于所述栅极介电层的远离所述沟道层的一侧；栅电极，其与所述半导体性栅极层电连接，所述栅电极在所述衬底上的正投影在所述沟道层在所述衬底上的正投影之外。所述半导体性栅极层具有与所述沟道层在场效应晶体管导通状态下的导电沟道相同的载流子 ...
钱庆凯, 陈敬
core
Dianci bileiqi, 2017 电力变压器的内绝缘在雷电过电压的多次冲击下产生累积效应,影响其绝缘性能。研究表明实际雷电入侵波存在双极性衰减振荡波形的情况。首先用不同频率的双极性振荡衰减波波形,取低于其击穿电压的电压值,对油纸绝缘试品进行累积冲击,绘出其V-N特性曲线,验证了累积效应的存在性,探索了V-N特性的规律;继而用宽带频谱介电测试仪对在双极性振荡衰减波作用下累积冲击了100、200、300以及并未受冲击的绝缘纸进行测试,并对比分析了四种情况下复相对介电常数和介质损耗角正切值的变化规律,验证了累积效应对油纸绝缘的损伤 ...
李文娟, 王庆芬, 孙江浩
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