Results 31 to 40 of about 8,951 (116)
Dianci bileiqi, 2019 通过深度分析中性点经小电阻接地方式所存在的问题,提出了一种配电网中性点经智能电阻接地方式。与小电阻接地方式相比,智能电阻采用分区法,根据中性点电压大小将故障类型分为高阻、中阻以及低阻3个区域。在低阻故障时,能够快速选线跳闸;在中阻故障时,经过延时判断,避免对瞬时性故障的误判;在高阻故障时,启动中、低电阻动态切换,进行准确选线。综合理论分析和仿真计算可得:智能电阻接地方式不仅拥有小电阻接地方式的优点,还能够解决小电阻接地方式中部分供电可靠性低、单相低阻接地时故障点电流过大及单相断线（高阻）接地时零序保护 ...
林俊超 +6 more
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Adivasi (Tea Tribe) worldviews of living close to wild Asian elephants in Assam, India
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract In Assam state, northeastern India, human–elephant conflict mitigation has included technocentric measures, such as installation of barriers, alternative livelihoods, and afforestation. Such measures treat conflict as a technical problem with linear cause–effect relations and are usually ineffective over the long term because they do not ...
Sayan Banerjee +2 more
wiley +1 more source
Integrative Conservation, Volume 3, Issue 3, Page 257-270, September 2024.Natural training enclosure design schematic. We selected 12 sika deer including six adults and six sub‐adults. Key considerations in the design of the natural training were to divide the training spatial ground into two parts (30 × 30 m small areas for isolation of new individuals and large areas measuring 200 × 600 m for free walking), and the ...
Wentao Zhang +10 more
wiley +1 more source
Policy &Internet, Volume 16, Issue 3, Page 485-508, September 2024.Abstract During the COVID‐19 pandemic, some groups and individuals rearticulated state power through conspiracy theories. Despite their fringe status, conspiracy theory beliefs can directly animate citizen's engagements with institutions. Drawing on Barkun's ‘conventional’ and ‘stigmatised’ knowledge types, we analyse the appearance of conspiracism in ...
Ben Lyall, Patrick Marple
wiley +1 more source
Policy Studies Journal, Volume 52, Issue 1, Page 139-167, February 2024.Abstract Sustainability governance in polycentric systems needs to ensure both effectiveness and procedural justice. Effectiveness and procedural justice are intricately linked to power dynamics in governance. To assess polycentric sustainability governance, understanding different types, sources, and effects of power is key.
Mario Angst, Martin Nicola Huber
wiley +1 more source
Dianci bileiqi, 2019 在中性点经消弧线圈接地方式的配电网发生单相接地故障时,对接地故障的处理、故障电流的控制、故障点的绝缘恢复、故障线路的查找等方面进行了分析,讨论了故障点对人身安全的影响;讨论了由于故障导致接地选线难的因素;讨论了故障发生后残流控制与故障恢复、弧光过电压及中性点位移电压的关系;讨论了配电网与消弧线圈接地方式在发展中存在的矛盾,认为目前该接地方式存在有严重的安全瓶颈、选线瓶颈与容量瓶颈,存在消弧困难和弧光接地过电压的问题,提出了中性点动态接地改造的重要性,并对其原理进行阐述。
张辉
doaj
Dianci bileiqi, 2018 针对10 kV变电台区设备在临近线路遭受雷击后虽然台区避雷器动作但仍发生台区变压器损坏的现象,本文使用场路结合分析的方法,对不同接地方式下的台区雷电冲击过电压进行分析。利用电磁暂态分析软件ATP-EMTP建立了台区雷电冲击电路分析模型,提取了经台区接地引下线进入接地体的冲击电流波形;使用接地分析软件CDEGS建立了台区接地体的场分析模型,得到了台区接地体在冲击电流作用下不同位置的电位瞬态分布情况。文章通过提取台区变压器高压绕组承受冲击电压的幅值,阐明了台区避雷器保护失效的机理 ...
刘守豹 +3 more
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野生动物学报, 2023 当代动物园的设计理念不仅仅局限于展示，更注重对动物及其栖息地的保护和动物福利等方面的内容。为此，于2021年7月—2022年12月，通过野外收集适宜海南坡鹿（Rucervus eldii hainanus）栖息生境中的生态因子，在海南热带野生动植物园，对海南坡鹿展区进行模拟生境改造。模拟生境展区计划占地6.67 hm2，设计理念兼顾坡鹿的保护和沉浸式观赏体验，设计方案主要包括功能区营造、边界设计和科普教育。依据功能不同将展区分为3个部分，即野化放归区、游客观赏区和饲养管理区，不同的功能分区在植物配置 ...
张建飞 +5 more
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Dianci bileiqi, 2023 小电阻接地系统发生高阻接地故障时电流小于传统的零序电流保护动作阈值，并且时常伴随有电弧的发生，难以准确检测与切除高阻接地故障。文章首先分析了小电阻接地系统发生单相高阻接地故障时母线零序电压与线路零序电流的稳态特征以及接地故障电流的暂态特性。其次，针对高阻接地故障常伴随的电弧现象，对Schwarz电弧模型引入电弧长度加以改进，将改进的Schwarz模型与Mayr模型、Schwarz模型、“控制论”模型对比，分析表明所提电弧模型具有一定的合理性；并搭建了电容电流达158 A的10 kV小电阻接地方式配网模型，
田凤兰 +7 more
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闽北山区红壤丘陵开发地生态恢复与综合利用模式构建及其应用研究
Shuitu Baochi Xuebao, 2006 山地生态系统的退化不仅是一个生态问题，也是一个经济问题。生态恢复重建不能仅仅就环境退化问题而开展生态功能的恢复重建，却而不去考虑经济恢复重建和区域脱贫与持续发展问题。根据红壤丘陵开发地退化成因分析和区域社会经济文化状况，建立了以水土保持为核心，“林果草牧沼菌”有效链接的治理模式，以草保土养地，以草带动地方产业发展．实现生态恢复与经济发展的双赢。
翁伯琦 +4 more
doaj +2 more sources