Results 21 to 30 of about 36,456 (153)
全球能源互联网长期服役的光伏发电系统直流配电故障概率高、火灾风险及危害大，严重影响光伏电站的运行安全、发电与出力能力，并对电站运维提出故障与火灾精准检测的技术挑战。为此，从生产现场直流配电柜故障分析入手，揭示接触不良、绝缘劣化、故障电弧、电气火灾的演变机理；分析国内外故障电弧诊断与火灾检测技术的理论成果应对在运电站电弧火灾的有效性，提出故障电弧预诊断与火灾检测技术的应用解决方案。研究结果表明，提出的故障电弧诊断与火灾检测技术应用方案，弥补直流继电保护对串联电弧故障无法保护的不足，能够有效诊断故障电弧并检测烟雾和高温 ...
宋振宇 +6 more
doaj +1 more source
Gaoya dianqi, 2023 针对换流变压器火灾中换流变压器上方跨线受热后易发生断裂的现象，利用火灾动力学模拟软件（fire dynamics simulator,FDS），研究换流变压器发生火灾时，周边水喷雾系统对上部空间温度分布的影响。结果表明：处于围护结构中的换流变压器发生火灾时易形成贴壁火羽流，并在喷雾作用下在远离阀厅的位置形成另外的高温区域；变压器上油枕、套管等结构，影响了火灾发生时的羽流流场，进而阻碍了部分区域的温度演变，在模拟所得温度场情况下，线缆钢材温度已经超过其力学性能和机械性能失效的临界值 ...
张佳庆 +6 more
doaj
Jianzhu Gangjiegou Jinzhan, 2022 为评估钢框架结构在火灾下抗震性能的损伤程度，提出基于钢材力学性能折减和基准刚度法的钢框架结构火灾损伤评估方法。对火灾不同温度工况下的钢框架构件进行损伤敏感度分析，研究不同温度工况与钢框架梁、柱的损伤关系；在不同楼层火灾下识别损伤结构模态参数，以损伤前的楼层层间刚度为基准，揭示钢框架结构不同楼层、梁柱构件、中跨和边跨火灾损伤对楼层损伤的影响规律；最终获得楼层损伤与整体结构损伤的关系，建立钢框架结构火灾下抗震性能损伤演化模型。研究成果可为建立不同温度工况下钢框架结构抗震性能的损伤模型提供理论基础 ...
李宁, 刘纪陆, 赵崛
doaj
Effects of restoration practices on biodiversity in temperate and boreal forests
Conservation Biology, EarlyView.Abstract Several restoration practices are used to mitigate and compensate for the negative effects of large‐scale forestry on biodiversity in temperate and boreal forests. A comprehensive synthesis of the benefits of these practices across taxa is missing. We conducted a systematic review and meta‐analysis on this topic.
Malin Tälle +2 more
wiley +1 more source
Disaster Cross‐Sector Collaboration Networks: Evidence from Four Historical Disasters
Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.ABSTRACT By conducting content analysis and social network analysis of media coverage of four historical disasters (i.e., the 2011 Joplin Tornado, 2013 Moore Tornado, 2017 Hurricane Harvey, and the 2023 Maui wildfire), this study uncovered characteristics of cross‐sector disaster collaboration networks.
Xiaochen Angela Zhang, Jonathan Borden
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 大跨度建筑空间大，火灾升温区别于小室火灾。大跨度建筑钢结构体系不同于多高层梁柱框架钢结构体系，其火灾下力学响应更加复杂。如何科学地评价大跨度建筑钢结构，特别是空间杆系钢结构和预应力张拉钢结构的抗火性能，受到了科研和工程技术人员越来越多的关注。简要回顾了大跨度建筑钢结构抗火的研究历程，论述了近年来大跨度建筑钢结构抗火研究的主要进展，并对大跨度建筑钢结构抗火研究提出展望。
杜咏, 李国强
doaj
Integrative Conservation, Volume 4, Issue 3, Page 503-513, September 2025.Fire occurrence increased with proximity to roads and villages, indicating that human access and activity are major drivers of fire risk. We analyzed spatial patterns of fire in relation to human settlements. Our findings highlight the need for fire management strategies that consider accessibility and human presence in conservation planning.
Aung Lin +4 more
wiley +1 more source
European Policy Analysis, Volume 11, Issue 3, Page 420-432, Summer 2025.ABSTRACT This article examines the fire and rescue services sector in Sweden in the period 1986–2021, and explains the timing of bureaucratic reforms using the Multiple Streams Framework (MSF). In this study, we insert institutions in MSF by employing a two‐level analysis; we highlight the interactions among experts acting as policy entrepreneurs over ...
Kerstin Eriksson +3 more
wiley +1 more source
Gaoya dianqi, 2023 变电站高电压电缆沟道环境的封闭性强，难以从沟道外判断电缆火灾早期发展状况。为了探测沟道内电缆火灾，研究火灾早期顶棚温度分布与电缆着火点位置之间的关系，以变电站高压电缆沟道为模型，开展电缆火灾燃烧实验，测量电缆沟道内温度的分布变化，分析顶棚温度距离着火点位置变化的拟合关系，验证了着火点辨识方法的准确性。研究结果表明，顶棚最大温升比例系数α的平均值为17.71,1∶1高压电缆沟道实验平台的温度测量结果准确；在纵向方向上，顶棚温度由着火点位置向两侧递减，温度变化曲线具有明显的阶段特点；在长度为5 ...
段玉兵 +6 more
doaj
Integrative Conservation, Volume 4, Issue 2, Page 113-115, June 2025.The integration of innovative public policies, interinstitutional collaboration and better scientific understanding of fire dynamics has enabled the effective implementation of the IFM and a more efficient response to megafires in Brazil. ABSTRACT Despite the ongoing challenges posed by megafires in Brazil, significant progress has been made from such ...
Alexandre de Matos Martins Pereira +7 more
wiley +1 more source