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Jianzhu Gangjiegou Jinzhan输电塔是典型的风敏感结构，易受下击暴流极端强风的影响，导致输电塔倒塌、线路受损等风害故障频发，造成巨大的经济损失。为分析下击暴流作用下输电塔倒塌破坏的原因，根据马鞍山地区一次下击暴流事故中的实测气象数据，以事故中整体倒塌破坏的羊角型直线塔为典例，建立“一塔两线”有限元分析模型，分析下击暴流0°、45°、60°、90°风向角作用下的输电塔体系的动力响应，探究下击暴流不同风向角作用下羊角型直线塔-线体系的受力特点、薄弱部位及破坏机理。研究结果表明：90°风向角是直线塔-线体系抗下击暴流作用的最不利工况 ...
韩承永 +5 more
doaj +5 more sources
, 2023 在强风作用下，屋盖作为风敏感部位往往最先发生破坏，如何抑制屋盖上的极值负风压是保障大跨建筑抗风安全的关键。基于此，提出一种简单有效的新型屋盖抗风气动措施。在平屋顶屋檐处安装旋涡发生器(PVG)，通过旋涡发生器的扰流作用来减小屋盖极值风压。采用风洞测压试验研究在不同风向角下PVG对屋面极值风压的气动控制效果，分析PVG对屋顶流场结构的影响并探讨PVG的工作机理。研究结果表明：PVG可以有效减小平屋盖屋面极值风压，尤其在倾斜风向角下的减压效果显著。在最不利风向角下，屋盖极值风压最大减小幅度可达73.3 ...
刘婷婷, 周蕾, 张洪福
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Research on Axial Flow Fan Models of Air Cooling Island in Power Plant [PDF]
ObjectivesAs the main equipment of the dry cooling system, the aerodynamic performances of axial flow fans play an important role in the flow and heat transfer performances of the direct dry cooling system.
CHEN Lei +5 more
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Short-Term Wind Power Prediction Method Based on Multimodal Feature Extraction-Convolutional Neural Network-Long-Short Term Memory Network [PDF]
ObjectivesWeather and random factors can alter the statistical characteristics of errors. Therefore, this study considers feature extraction of various climate factors that affect wind power.
GUO Qian, KUANG Honghai
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Trump, Personalism, and US Administrative Capacity
Politics &Policy, Volume 53, Issue 4, August 2025.ABSTRACT Donald Trump represents an extraordinary degree of personalism in American politics, especially given the traditional power and capacity of the Republican Party and American democracy. A lesson Trump drew from his first term in office is that he needed to better institutionalize mechanisms of personal loyalty to deal with perceived betrayals ...
Donald Moynihan
wiley +1 more source
Patchwork Governance on KidTok: Balancing Regulation and Community Norms
Policy &Internet, Volume 17, Issue 2, June 2025.ABSTRACT TikTok's rapid growth among young users has introduced unique challenges to existing frameworks for understanding child internet fame. We identify “KidTok” as a unique networked public for “internet famous” young people on TikTok shaped by the platform's sociotechnical environment and explore the novel risks that governance should address ...
Alex Turvy, Crystal Abidin
wiley +1 more source
, 2003 虽然防护林用于减小风速、控制热量和水汽传递及污染物扩散、改善气候与环境、增加作物产量等已经有几百年了,但直到近几十年,人们才开始系统地研究防护林空气动力学的遮蔽机制.在本综述中,我们考察了绕防护林带的流动与湍流控制机制,最新的模型与数值模拟研究情况;通过数值模拟与实验数据的比较,来了解防护林带结构与防风效果之间的关系;讨论数值分析如何及为什么能够得到所需要的结果.本文将从多孔隙防护林带流动基本方程组的推导开始,讨论数值模型及模拟过程,对附体与分离流动进行预测;分析了遮蔽机制与动量交换;对风向、防护林密度、
Shen JM +4 more
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Anomaly Detection for Photovoltaic Based on Improved VMD-XGBoost-BiLSTM Combination Model [PDF]
Photovoltaic is a vital and rapidly developing form of renewable energy generated in China, and anomaly detection is a crucial reference for making decisions on its system operation and maintenance.
Bochao ZHAO, Jiajun MA, Lei CUI, Wenpeng LUAN, Jing ZHU
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Dianci bileiqi, 2021 针对目前风机防雷设计效果不佳的问题,为提出技术经济最优的接闪器布置方案,需获取准确的风机叶片雷击概率分布特性。拟基于正极性迎面先导起始与发展模型和负极性地闪下行发展模型,结合有限元分析方法,建立风机接闪过程的物理仿真模型,计算不同雷电流幅值下风机不同部位的击距,并提出风机不同部位的接闪面积计算方法,得到典型风机叶片在三种不同角度时不同部位的雷击概率分布。仿真结果发现当单个叶片竖直向下、保持水平以及竖直时向上,在正极性和负极性雷电下,雷电在叶片0～5 m范围内附着的概率分别为89.77%、93.64 ...
王健 +5 more
doaj
China's Eco‐Civilisation, Climate Leviathan, and Hobbesian Energy Transition
Antipode, Volume 57, Issue 3, Page 830-861, May 2025.Abstract Scholars have hitherto tended to theorise China's ecological civilisation project either as a form of environmental authoritarianism or as a vision of eco‐socialism. This paper contributes to the conversation by conducting a textual analysis of Chinese scholarly discussions on eco‐civilisation.
David Chen
wiley +1 more source