Results 31 to 40 of about 920,028 (168)
Gaoya dianqi, 1984 在户外高压开关中,有些产品没有灭弧装置,但却要求具备在大气中开断一定数值的小电流的能力。例如,空载变压器自切开关、隔离开关等都属此类。长期以来,这些产品的开断能力试验,大多是在试验室里进行的。但有时在户外现场试验中发现,往往与试验里测得的结果不一致。分析认为,此类开关开断小电流的能力 ...
艾克郑
doaj
Constructing Serrated Boride Composite Layer for Enhancing Wear Resistance of Ti6Al4V Alloy
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Appropriate configuration combined with strong interface bonding is the essential requirement for developing high wear‐resistant coatings. Herein, based on the powder‐pack boriding process, the properties of Ti6Al4V alloy are effectively improved by constructing a serrate tribological boride composite layer.
Ying Wu +9 more
wiley +1 more source
Gaoya dianqi, 2016 文中讨论了在探索选择六氟化硫（SF6）替代气体的过程中关于气体开断能力研究的重要性,并对气体开断能力的评估进行了阐述。简要总结了目前工业界对SF6替代气体开断试验的结果。以N2和CO2为例,从理论上分析了其开断性能劣于SF6的原因,初步建立了喷口电弧中气体开断能力与物性参数间的关系,为理解SF6替代气体开断机理及选择判据的建立提供理论依据。
阎究敦, 张权, 曹昆
doaj
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Enhancing the strength of 7000 series high‐strength Al alloys remains a critical challenge to meet the demands of increasingly demanding service environments. In this study, a novel approach is proposed for developing high‐performance Al alloys through a combination of powder mechanical alloying, powder press‐forming, rolling deformation, and ...
Peng‐Fei Ji +4 more
wiley +1 more source
Gaoya dianqi, 2012 综述了SF6断路器极限开断能力以及介质开断能力的数值预测方法的最新研究进展。电流过零前200 ns的电弧电导（G200）是判断断路器热开断能力的一个重要参数,为计算G200,对电弧特性进行模拟,在燃弧阶段采用磁流体动力学模型,而在接近电流零区采用Mayr模型,从而建立相应的电路模型来确定电弧时间常数和电弧功率损耗系数等参数,以分析高压断路器的热开断能力。为判断电击穿能力,需要根据电弧过零时灭弧室内的每一点的压力和温度值,确定对应点的临界击穿场强分布Ec,同时计算在暂态恢复电压作用下灭弧室内的电场分布Ea,
牟京卫 +5 more
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Robust metrics for quantifying and comparing resistance and recovery in experimental studies
Methods in Ecology and Evolution, Volume 17, Issue 1, Page 6-14, January 2026.Abstract Various indices have been developed to experimentally quantify resistance and recovery (two components of engineering resilience) in response to anthropogenic and natural disturbances. This diversity complicates the selection of appropriate metrics for comparing resilience across ecosystems and studies.
Zewei Zhuang +2 more
wiley +1 more source
Gaoya dianqi, 1984 真空断路器的灭弧室外形结构,几乎已典型化,而灭弧室中触头的几何形状及触头材料,则相差很大。近几年来,由于触头几何形状设计改变,开断电流有了较大的突破,在实验室中开断能力已达到200kA以上。为了研究触头结构对真空灭弧室的开断能力的影响,我们对几种不同触头结构的真空灭弧室的开断能力 ...
喻立贵
doaj
New Directions for Child and Adolescent Development, Volume 2026, Issue 1, 2026.Background Working memory updating is crucial in bilingual children′s second language (L2) reading comprehension. A robust updating ability is a cognitive key for children to successfully master L2 reading comprehension. Objective This study is aimed at investigating the effect of updating ability on the L2 Chinese reading comprehension among Uyghur ...
Guangxin Li +3 more
wiley +1 more source
Gaoya dianqi, 1997 阐述了超高压SF6断路器现代化设计的必要性。在灭弧室全场域数值分析基础上,对SF6压气式断路器的三种开断过程:即开断小电容性电流后的介质恢复强度、端子短路故障开断能力及近区短路故障开断能力进行了数值分析。
王其平
doaj
World Medical &Health Policy, Volume 17, Issue 4, Page 912-920, December 2025.ABSTRACT In Brazil, the healthcare system is based on the provision of a public system that offers free and universal services to all citizens, supplemented by private initiative. Evaluating user satisfaction plays an important role in identifying improvements and promoting organizational changes that benefit everyone involved.
Patrícia Silva Bazoni +8 more
wiley +1 more source