Results 1 to 10 of about 13,542 (119)
Gaoya dianqi, 2023 为提高对大电流接地开关设计结构的认识，提高设计可靠性，文中对某型号发电机断路器成套装置用接地开关进行了设计研究。接地开关体积小，动热稳定性考核严苛，采用经验公式与仿真分析相结合的方法，完成了满足短时耐受电流130 kA(3 s)、峰值耐受电流390 k A参数条件的接地开关设计，并通过动热稳定型式试验验证了设计的合理性和可靠性。
弟泽龙 +4 more
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Dianci bileiqi, 2022 我国中低压配电网多采用中性点不接地系统及谐振接地系统，发生单相接地故障时易引起弧光过电压及扩大事故，有效处理配网单相接地故障接地点电弧是配网安全稳定运行的基础。本研究针对消弧线圈、转移接地开关、消弧线圈+转移接地开关3种熄弧技术分别建立10 kV配电网单相稳定接地及弧光接地故障数值计算模型。设置不同故障点过渡电阻、不同故障相的间歇性电弧故障、不同出线结构等故障条件，对比各熄弧方法下的故障点电流及转移接地相电流，分析3种熄弧方法的熄弧效果。结果表明：消弧线圈在出线结构不同(增设电缆线路)时，熄弧效果不理想；
李景丽 +5 more
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Habitat and spatial trends of U.K. wintering waterbird populations over 50 years
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract The United Kingdom is an important wintering ground for millions of waterbirds. Most U.K. wintering waterbird populations increased between 1970 and the mid‐1990s, but declined thereafter. We examined U.K. population indices in 46 wintering waterbird species in two 25‐year periods, 1970–1994 and 1995–2019, to identify which waterbird groups ...
Blaise Martay +8 more
wiley +1 more source
Dianci bileiqi, 2021 10 kV配电网中性点接地方式的选择对配网安全运行及故障处理具有重要作用。以输电线路电缆化率为研究对象,利用ATP-EMTP建立10 kV配电网接地方式仿真模型,分析了不同电缆化率及接地方式下发生单相接地故障时的电气特性,并据此划分了不同接地方式的适用范围;详细比较了不同接地方式转供电的特点,给出建议的合环方式及保护配置,得到了如下结论:第一 ...
杨磊 +5 more
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Risks of concealing environmental degradation
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Current practice seeks to conceal the visual impact of land‐use change (i.e., development). Six percent of development impact assessments in Australia and 14% of the World Bank's assessments recommend visual impact mitigation. This mitigation results in, for example, vegetated buffer strips alongside cleared agricultural areas and earthen ...
Matt W. Hayward +8 more
wiley +1 more source
Scientists’ warning on the global destruction of rock outcrop ecosystems
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula +19 more
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
Canine Distemper Virus Research in China and Future Directions for Conservation 中国犬瘟热病毒研究现状与保护策略展望
Integrative Conservation, Volume 5, Issue 3, Page 268-280, September 2026.ABSTRACT Canine distemper is a highly contagious, severe disease caused by the canine distemper virus (CDV). With a worldwide distribution and ever‐expanding list of susceptible hosts, CDV poses a growing risk for many threatened wildlife species, both in captivity and their native habitats. As a megadiverse country, China is home to myriad endemic and
Aliana C. Norris +4 more
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Gaoya dianqi, 2006 概括了接地开关开合感应电流的运行工况及同杆双回线路电磁感应与静电感应的产生机理;还对相关的国际、国内标准中对接地开关切合感应电流的试验方法和参数进行了归纳;介绍了中国接地开关开合感应电流的应用现状和产品情况;提出了应重视接地开关开合感应电流的必要性,并按计算结果合理地选择接地开关。
郭贤珊
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT The escalating severity of global environmental pollution necessitates the development of sustainable and efficient adsorption materials. Nanocellulose (NC), sourced from the most abundant natural polymer on earth, has shown great potential in this field due to its renewability, biodegradability, and exceptional nanoscale properties.
Yaqian Yu +5 more
wiley +1 more source