Results 21 to 30 of about 920,028 (168)
Gaoya dianqi, 2002 论述了提高双断口真空断路器开断能力的原理 ,比较了双断口和单断口真空断路器的开断能力。实验结果表明 ,双断口真空断路器的开断能力较单断口高 2倍。讨论了均压电容对开断能力的影响 ,提出了对操动机构的要求 ,最后 ,介绍了多断口真空断路器的优点。
廖敏夫, 邹积岩, 段雄英
doaj
In vitro culture, cryopreservation, and field reintroduction of the endangered Mingan thistle
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Current plant conservation efforts are hindered by, for example, poor seed germination, low viability, and insufficient propagation and preservation technologies. To address these problems, we devised an approach to plant conservation that integrates conservation, preservation, and restoration (CPR), which uses advanced in vitro techniques. We
Mukund R. Shukla +4 more
wiley +1 more source
Impacts of Human Development on Wildlife Use of Corridors in Botswana 人类开发对博茨瓦纳野生动物廊道利用的影响
Integrative Conservation, Volume 5, Issue 1, Page 164-171, March 2026.This study examined the effect of landscape‐scale human impact on wildlife in Botswana. We examined how species use wildlife corridors in two different human‐dominated landscapes. We identified differences in temporal overlap between wildlife and humans across both landscapes, which is fundamental to consider in both current and future conservation ...
Tempe S. F. Adams +3 more
wiley +1 more source
Gaoya dianqi, 2006 研究了杯状纵磁真空灭弧室的极限电流开断能力与触头直径和触头开距间的规律,建立便于设计时应用的计算公式。从合成回路上开断能力的试验结果出发,将三维有限元法对杯状纵磁触头的纵向磁场的计算结果引入到开断能力与触头直径和触头开距的关系式中,初步得到极限电流开断能力与触头直径和触头开距的关系为I=k×D2×Bz0.4,式中k是系数。该式的物理意义是开断能力随触头直径的增加而增大,随触头开距的增加而减小。
刘志远, 王仲奕, 张炫, 王季梅
doaj
World Affairs, Volume 189, Issue 2, Summer 2026.ABSTRACT Cognitive empires represent a new form of imperial power: influence exercised not through territory or coercion but through the structuring of cognition itself. AI‐enabled systems increasingly shape emotion and judgment from within, producing influence that scales rapidly, appears voluntary, and hardens into mass cognitive dependence.
Ketan Patel
wiley +1 more source
Gaoya dianqi, 1999 交流高压跌落式熔断器（简称熔断器）在电力系统中所遇到的开断条件,均应在型式试验中得以验证.因此,在开断试验中既要考虑配电系统短路电流暂态波形的特点,又要考虑各种短路电流的开断能力.所以IEC282—2—1995确定了各种开断电流的5种试验方式:方式1,试验100%额定开断电流能力,基于熔断器开断短路电流期间产生的电弧能量与预期开断电流值近似成正比,此方式验证灭弧管熄灭这一电流能力;方式2,试验0.6～0,8倍额定开断电流能力,虽然这一电流产生的电弧能量小于试验方式1,但开断这一电流的燃弧时间可能较长 ...
刘富波
doaj
短路电流直流分量对断路器电弧长度、压气室压力、喷口气体质量流的影响研究
Gaoya dianqi, 2021 随着电网容量的不断增大,电力系统短路电流直流分量的时间常数有很大可能大于其标准时间常数45 ms。目前非对称短路电流直流分量对断路器燃弧阶段关键参数的影响规律尚无研究。因此,文中研究目标是获得短路电流直流分量对断路器燃弧阶段关键参数的影响规律。基于高压断路器内部结构建立电弧物理焓流仿真模型,分别研究气体断路器开断对称电流和非对称电流时,燃弧阶段的关键电弧参数如电弧长度、压气室压力、喷口处气体质量流等参数的变化规律。研究结果显示:相同燃弧时间条件下,相比于对称短路电流,非对称短路电流开断时 ...
马飞越 +7 more
doaj
Journal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.ABSTRACT Bangladesh's goal of achieving high‐income status by 2041 requires dependable, low‐emission, and affordable energy. With near‐universal grid coverage and increasing demand, nuclear energy is a strategic asset for long‐term baseload supply. However, the existing financing model, typified by the country's most expensive $12.65 billion Rooppur ...
Hafiz Ahmed
wiley +1 more source
Gaoya dianqi, 2011 风能作为可再生的绿色能源,将成为以分布式发电为特征的智能电网的重要组成部分。然而现有电力系统抗风电扰动能力差是影响风电产业发展的关键性制约。采用分频输电技术可解决上述风电并网问题,而分频输电会造成断路器开断短路电流时有较长的燃弧时间,从而引起断路器的开断能力降低。笔者综述了分频输电对真空断路器开断能力的影响。Slade研究指出当系统频率降低时,真空断路器的短路电流开断能力的降低与频率降低倍数的平方根有关,即ix（f1）/ix（f2）=（f1/f2）～（1/2）。对于采用横向磁场触头,触头直径为62 ...
刘志远
doaj
Nitrogen Anchoring Effect Triggering Improved Reversible Hydrogen Storage of Mg(BH4)2
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT This research uncovered the influence of nitrogen‐doped MXene Ti3CN on the reversible hydrogen storage properties of Mg(BH4)2. The Mg(BH4)2‐20Ti3CN composite began releasing hydrogen at a temperature of 80°C. In addition, the composite discharged over 8.8 wt% hydrogen at a comparatively lower temperature of 270°C, whereas the pure Mg(BH4)2 ...
Zhen‐Xuan Ma +7 more
wiley +1 more source