Results 21 to 30 of about 3,982 (117)
The soft channels of policy diffusion: Insights from local climate change adaptation policy
Policy Studies Journal, Volume 52, Issue 4, Page 881-906, November 2024.Abstract Diffusion has become both an important concept for studying policy spread and a popular governance approach, particularly where direct coercion is unavailable or undesirable. However, the prevailing mechanism‐centered concept is difficult to measure and poorly captures the governance potential of policy diffusion. To address these issues, this
Kai Schulze
wiley +1 more source
An emotional perspective on the Multiple Streams Framework
Policy Studies Journal, Volume 52, Issue 4, Page 925-940, November 2024.Abstract Emotions are central to human behavior and, consequently, play a significant role in policymaking. While the Multiple Streams Framework (MSF) incorporates the notion of “public mood” into the political stream, this concept primarily focuses on a fleeting, less intense, and diffuse emotional state that is not necessarily linked to a specific ...
Moshe Maor
wiley +1 more source
Integrated water resources management and the land‐water nexus: A South African perspective
World Water Policy, Volume 10, Issue 3, Page 755-779, August 2024.Abstract As a source of diffuse pollution, land use/land cover (LULC) can have profound impacts on water quality. Accordingly, the importance of managing the land‐water nexus is often emphasized in the rhetoric of Integrated Water Resources Management (IWRM).
Kent Anson Locke
wiley +1 more source
Conservation Biology, Volume 38, Issue 2, April 2024.Abstract Private land protection is an important and growing tool to address biodiversity loss and climate change. Thus, better empirical evidence on the effectiveness of private land protection and organizational practices, such as targeting of lands for protection and choice of protection mechanism (i.e., fee simple land acquisition and conservation ...
Sarah Hagen +5 more
wiley +1 more source
Dianci bileiqi, 2017 分析杆塔接地极的冲击散流特性对优化接地极的结构、降低接地极的冲击接地电阻具有指导意义。基于电磁场的理论,在CDEGS中建立了计及土壤非线性电离影响的接地极仿真模型,通过模拟试验验证了模型的正确性,并依据模型对放射型接地极的冲击散流特性进行了研究。结果表明:放射型接地极在水平射线上的散流分布很不均匀,且散流比重远大于内部方框;冲击散流分布受土壤电阻率的变化影响较明显,冲击电流幅值的变化对其影响不大。此外,从提高接地极的冲击散流效率出发,提出两种改进的放射型接地极,经仿真验证 ...
时维经, 刘浔, 徐胜, 商志伟
doaj
Dianci bileiqi, 2015 研究接地体冲击散流特性是优化地网冲击特性、降低输电线路雷击跳闸率的重要措施。通过对接地导体分段建立频域电网络模型模拟接地体冲击泄流过程,采用迭代法考虑土壤动态电离对散流分布的影响,并利用CDEGS软件仿真及真型散流试验对频率电网络模型及其迭代求解结果进行了对比验证。本文研究了标准电流波形下水平伸长接地体在不同接地体尺寸、不同土壤电阻率及不同电流峰值下的散流规律,得出接地体冲击散流不均匀分布是由导体段之间对地互阻抗及电感效应引起的。
魏绍东 +5 more
doaj
±1100 kV/5455 A特高压直流换流阀饱和电抗器散热设计与研究
Gaoya dianqi, 2020 饱和电抗器是换流阀中保护晶闸管的关键部件,运行时饱和电抗器铁心产生的损耗导致铁心温度升高,严重情况下会导致饱和电抗器失效,从而威胁换流阀的安全运行。为降低饱和电抗器铁心温度,确保特高压直流工程可靠性,必须研究铁心散热性能并优化饱和电抗器结构。首先,研究了壳式饱和电抗器内部结构,分析了铁心散热的机理;然后,通过对饱和电抗器内外部结构的优化,为±1 100 kV/5 455 A特高压直流工程设计开发了一款螺旋结构的饱和电抗器,运行时外壳周围形成多重散热风道,优化了散热效果;最后,基于光纤测温原理 ...
刘磊 +5 more
doaj
Dianci bileiqi, 2012 在冲击电流试验回路中,输出波形必须满足IEC标准规定的要求。已有研究表明,杂散参数对陡波冲击电流发生回路的影响尤为严重,而且避雷器等试品具有非线性U-I特性,在冲击电流发生回路的设计中必须考虑。针对此问题,首先研究了回路的剩余电感对输出波形的影响。对于波前时间小于1μs的陡波冲击电流发生器,回路需要的总电感在1μH左右,所以要尽量减小回路的剩余电感,否则会使波前时间增大,超出IEC标准要求。然后在线性回路情况下推导了考虑杂散电容时回路输出电流的表达式,进而研究杂散电容对输出波形的影响。研究表明 ...
袁海燕, 庄燕飞
doaj
Gaoya dianqi, 2017 晶闸管换流阀用水冷散热器是换流阀的关键器件,笔者在研制±800 k V/6 250 A特高压直流工程换流阀样机时,为了对水冷散热器性能评价的重要指标—热阻的测试进行更加准确的测量,在查阅资料和总结现有方法的基础上提出了一种多点布置和通过进出水温度计算耗散功率的简单可行、操作性强、相对更为直接的测试方法,此方法较为适合工程应用。通过仿真和试验验证了所用方法正确,可操作性强。
马元社 +6 more
doaj
Dianci bileiqi, 2022 笔者针对钢结构变电站直击雷防护，对雷击过程中变电站接地特性进行研究，相较于通过避雷带引下线接地的现行方案，在采用钢柱直接接地情况下，地表电位升最大值下降幅度达到26.5%。钢结构变电站的导体网络对于具有大量高频分量的雷电流具有明显的电感效应，地表电位升峰值时刻超前于雷电流约5μs。雷电流散流集中于注流点附近的4～5条引下线或者连接线，总散流占比超过90%,相比现行方案，通过钢柱接地的方案散流更加集中于注流点附近的4条连接线，距离注流点最近的连接线分流占比达到了55.19 ...
李凡 +5 more
doaj