Results 51 to 60 of about 71,604 (169)
Gaoya dianqi, 2019 大型油浸式电力变压器负载损耗较高,且绕组及油道结构复杂,为更好地掌握大型油浸式电力变压器绕组温度场分布特性,文中针对220 kV大型油浸式电力变压器,在分析变压器损耗与传热的基础上,建立了变压器流体力学-温度场耦合的仿真模型,基于有限元分析求得变压器内部温度—流体场,研究结果表明:由于绕组内部起导油作用的油道隔板的影响,温度沿绕组轴向高度呈周期性上升趋势;绕组局部温度分布不均衡,对绕组油道结构进行优化设计可改善绕组温度分布的局部不均衡性,降低绕组热点温度。
刘弘景 +6 more
doaj
Cliquepolitik: Multimodal online discourse coalitions on CRISPR‐Cas genome editing technology
Review of Policy Research, Volume 42, Issue 1, Page 50-76, January 2025.Abstract The influence of visualizations on decision‐making about controversial policy issues is increasingly recognized in the political and policy sciences. In this paper, we explore how combinations of visuals and text on Twitter (now X) lead to the formation of networks of actors sharing similar textual and visual framings about a policy issue in ...
Eduardo Rojas‐Padilla +2 more
wiley +1 more source
Youth engagement in global conservation governance
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract Youth are increasingly recognized for their important role in shaping environmental decisions surrounding conservation. Regrettably, youth who are crucial decision‐makers are often excluded from environmental governance spaces due to structural barriers, both economic and political.
Samantha S. Sithole +3 more
wiley +1 more source
, 2012 本发明公开了一种风电机组偏航制动磁触变柔性制动装置及风电机组。该制动装置包括外圈、内圈、磁轭、线圈绕组、制动轮、以及磁触变胶。其中，外圈和内圈通过磁轭连接，并可固定到风电机组的塔筒法兰上。制动轮包括固定部和制动部并可固定到机舱座上。外圈与内圈连接后，形成有用于容纳制动轮的制动部的制动槽和用于容纳线圈绕组的线圈绕组槽。制动轮的制动部可转动地安装到制动槽后，在制动部与内圈和外圈之间形成有间隙，磁触变胶容纳在间隙内。该制动装置有效地降低偏航驱动系统轮齿的磨损及点蚀，降低制动噪声及偏航制动时的整机振动 ...
吕宏展
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Gaoya dianqi, 2017 电力变压器短路故障产生的短路冲击会造成绕组变形,限制系统短路电流对降低变压器绕组动态变形意义重大。文中以110 kV电压等级的三绕组电力变压器为例,中压绕组发生出口短路故障时,基于磁—力学耦合场研究方法,对变阻抗变压器和常规变压器绕组动态变形进行数值分析。变阻抗变压器的研究包括变压器本体和限流电抗器2部分,分析了短路电流作用下,变压器绕组和限流电抗器线圈的变形、动态应力、位移。常规变压器和变阻抗变压器绕组变形的对比可得变阻抗变压器变形量较小。分析结果为变阻抗变压器绕组变形状态评估提供参考依据。
杜玮 +6 more
doaj
Triggering policy learning via formal EU evaluation requirements in the case of Cohesion Policy
European Policy Analysis, Volume 10, Issue 4, Page 515-531, Fall 2024.Abstract The European Union (EU), especially in the context of Cohesion Policy (CP), has played a crucial role in developing and promoting policy evaluation practices across its Member States. Evaluation systems across the Member States have been established to assess CP investments.
Nicola Francesco Dotti +4 more
wiley +1 more source
Mediated trust, the internet and artificial intelligence: Ideas, interests, institutions and futures
Policy &Internet, Volume 16, Issue 2, Page 443-457, June 2024.Abstract This paper addresses the question of trust in communication, or mediated trust, with regard to the historical evolution of the Internet and, more recently, debates around the impacts of artificial intelligence (AI). At a conceptual level, it proposes a ‘Three I's’ framework of ideas, interests, and institutions as a way of understanding how ...
Terry Flew
wiley +1 more source
柔性绕丝燃料组件轴流向流致振动实验装置及模拟方法 [PDF]
本发明公开了一种柔性绕丝燃料组件模型轴流向流致振动实验装置及模拟方法，包括：波流水槽，用于存放实验用水，并能够产生波浪及水流，以使绕丝燃料组件模型发生流致振动；支撑架，设置有两个，分别安装于波流水槽的上游侧和下游侧；两个支撑架上均竖直安装有伸入波流水槽的立杆；绕丝燃料组件模型，一端通过万向联轴器与上游侧的立杆的下端连接，另一端通过钢丝绳与下游侧立杆的下端连接；钢丝绳的中部安装有用于给绕丝燃料组件模型施加轴向力的张紧器 ...
刘艳, 刘俊, 刘小明, 高福平
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