Results 31 to 40 of about 4,514 (129)
Review of Policy Research, Volume 42, Issue 6, Page 1509-1524, November 2025.ABSTRACT This paper provides a retrospective on California's oversight of 1,3‐dichloropropene (1,3‐D). It utilizes archival documents, including internal memos, emails, and risk assessments, to demonstrate how the state's Department of Pesticide Regulation consistently expanded allowable 1,3‐D use while presenting each policy change as scientifically ...
Kaitlyn Alvarez Noli
wiley +1 more source
Gaoya dianqi, 2010 基于后退欧拉法和变分原理推导了非线性的时域有限元电场计算方程。利用时域有限元方法分析了含不同应力控制管时的电缆终端电场分布。分析结果表明,采用由电容性和非线性电阻性材料复合绝缘结构的应力控制管时,电缆终端的电场分布最为均匀。
宫瑞磊 +4 more
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Risk, Hazards &Crisis in Public Policy, Volume 16, Issue 3, September 2025.ABSTRACT The communication of political leaders towards voters has become increasingly important in modern democracies – even more so during crises. This article addresses the question of which factors influence the presence of heads of government during crisis communication?
Lore Hayek +2 more
wiley +1 more source
Dianci bileiqi, 2013 特高压换流变阀侧套管承受混合电压,电场分布十分复杂。采用ANSYS软件仿真分析了特高压换流变阀侧套管在极性反转下的电场分布情况。计算得到了主要介质达到直流稳态的时间常数和最大场强值以及沿伞群的电场分布。计算结果表明:直流稳态后反转的电场要高于极性反转试验中的电场。在介质的分界处,伞群电场有最大值。分析结果为换流变压器阀侧套管的极性反转试验以及设计制作提供了科学的依据。
杜清全 +5 more
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European Policy Analysis, Volume 11, Issue 3, Page 333-367, Summer 2025.Abstract In this study, we seek to understand the interplay between industry and policy, to explain how and why the UK shifted from the promotion of low‐emission road transportation, to policy based on zero tailpipe‐emission electric vehicles (EVs), as part of its evolving net zero ambitions.
Ural Arslangulov, Robert Ackrill
wiley +1 more source
Gaoya dianqi, 2019 基于静电场分析研究ZW20型柱上开关局部放电是绝缘结构优化设计的主要手段之一。文中通过静电场分析获得其电场分布云图,通过理论分析指出:出线套管密封圈附近,电流传感器与出线套管之间及绝缘盒与出线套管之间空气域电场强度超过空气的介电强度是局部放电的关键原因。而后根据静电场复合绝缘理论,提出一种出线套管内铜棒与绝缘盒动端、静端新型的连接方式,并在其内部增设法兰屏蔽罩的优化方案。通过静电场分析可知优化后关键位置气隙电场强度明显降低,并通过试验测试进行验证,从理论及工程实际中验证了此优化方案的可行性。
张文凯 +4 more
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Gaoya dianqi, 2020 隔离开关广泛应用于气体绝缘开关设备（GIS）中,文中采用三维有限元电场分析软件,建立了GIS隔离开关气室的三维电场仿真模型,计算了GIS隔离开关气室内各部件的电场分布,研究了金属异物对隔离开关气室内部SF6间隙电场分布的影响规律,发现金属异物的存在引起隔离开关动触头屏蔽罩附近场强发生明显畸变,可能会导致GIS隔离开关气室绝缘故障。文中研究通过电场模拟手段,分析了金属异物对GIS隔离开关气室内部电场分布的影响,为今后GIS类似故障的处理分析提供借鉴与参考。
杨为 +5 more
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Digest of Middle East Studies, Volume 34, Issue 3, Summer 2025.ABSTRACT The Arab Spring resulted in an expansion of social and individual freedoms in Tunisian society, but it also brought political instability, negatively impacting what had long been the country's primary source of employment—tourism. This economic crisis forced many to improvise their own sources of income, and it was in this context that a new ...
Camila Ponce Lara
wiley +1 more source
The platform policy matrix: Promotion and regulation
Policy &Internet, Volume 17, Issue 1, March 2025.Abstract This study provides a comprehensive analysis of policy measures adopted by countries in response to the rapid growth of digital platforms, which significantly impact various sectors and national economies. It examines the delicate balance between regulation and innovation, offering nuanced policy recommendations.
Junic Kim, Shanghe Ahn
wiley +1 more source
Gaoya dianqi, 1995 采用等参元有限元法对真空接触器—熔断器组合电器静电场进行了数值计算,介绍了三维静电场等参元的分析方法,剖分单元为15节点五面体单元,场域自动剖分具有几何尺寸可变、单元疏密可调的特点。任意一点电场强度和任意一条电力线长度的计算,使三维静电场逆问题的求解成为现实,为了考核三维静电场数值计算准确度,分别求解两平行圆柱电极间电场的解析解与数值解,并进行了比较。
汪友华 +4 more
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