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Jianzhu Gangjiegou Jinzhan建筑结构火灾事故发生频繁，火灾可能对建筑物造成严重损伤，甚至引起建筑物倒塌，导致人民生命和财产的巨大损失。对于遭受火灾但未倒塌的建筑物，则可进行修复、加固后再利用。修复加固前，需要对受火损伤的建筑结构进行科学、详细、准确的检测和鉴定，确定建筑物结构材料的剩余强度和构件的损伤程度，为建筑结构的修复加固提供依据，从而达到经济、安全地恢复建筑结构使用功能的目的。归纳了火灾后建筑钢结构检测与评估的研究进展，介绍了建筑结构火灾后现场调查分析的步骤和方法，分析了构件、火场经历的最高温度的判定方法及其适用性 ...
蒋彬辉, 浦通葳, 李国强
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Gaoya dianqi新型变电站高压开关柜漏电火灾在线监测算法在监测的过程中存在漏电数据收集失误现象，火灾信息评估的完整程度较低，在监测的同时需调整算法机制，导致预警不及时，监测的精度较低。针对该问题，对新型变电站高压开关柜漏电火灾进行在线监测，首先针对开关柜漏电情况收集漏电数据，根据剩余电流判断漏电信息，及时捕捉精准的漏电区域数据，利用D-S证据理论融合算法对获取的漏电数据发生火灾的情况进行在线监测，构建识别框架并提取相似函数，判断达到火灾时的温度阈值，完成整体监测研究。根据分析的结果可知 ...
戴强 +5 more
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Gaoya dianqi基于流体动力学计算软件文中研究了不同着火位置对高压开关柜火灾的影响，分析了柜内温度场、无量纲温度因子、烟气分布及总热释放率火灾特征参量。计算结果表明，手车室发生火灾时最高温度低于电缆室或母线室最高温度，且不同着火位置下顶壁或侧壁无量纲温度因子差异明显，可用来进行早期火灾安全预警的诊断手段。烟气场和总热释放速率分布表明，电缆室和手车室着火时，其烟气可充满整个高压开关柜柜体，而母线室着火时烟气仅充满整个母线舱室。另外，电缆室火灾具有较大的总热释放率，因其相邻手车室可燃构件也被引燃进而释放更多的热量 ...
张佳庆, 祝现礼, 过羿, 尚峰举
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Finding floral and faunal species richness optima among active fire regimes. [PDF]
Conserv BiolAbstract Changing fire regimes have important implications for biodiversity and challenge traditional conservation approaches that rely on historical conditions as proxies for ecological integrity. This historical‐centric approach becomes increasingly tenuous under climate change, necessitating direct tests of environmental impacts on biodiversity.
Steel ZL +8 more
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Disturbance Dynamics and Its Effects on Carbon in Human-Impacted Mountain Forests in Northwestern Yunnan, China. [PDF]
Ecol EvolIdentifying and quantifying natural and anthropogenic disturbances at fine spatial scales is critical to assess the role of forests in climate change mitigation. Using tree rings, fire scars, satellite imagery, official records, and interviews, we reconstructed historical disturbances and identified fires, logging events, landslides, and icy ...
Cheng Z, Aakala T, Ji C, Larjavaara M.
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Risk, Hazards &Crisis in Public Policy, Volume 14, Issue 4, Page 297-320, December 2023., 2023 Abstract Urban marketplace fires in Ghana are chronic, devasting in economic losses and disproportionately impacting informal sector workers. Yet, the scholarly works on urban disasters have focused on hydrometeorological and other man‐made disasters to the neglect of marketplace fires, particularly the challenges in risk communication between ...
Matthew Abunyewah +5 more
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Emergency management and the final frontier: Preparing local communities for falling space debris
Risk, Hazards &Crisis in Public Policy, Volume 14, Issue 3, Page 247-266, September 2023., 2023 Abstract Global dependence on satellite technologies, along with expanding space exploration, and commercial space travel have made rocket launches routine modern‐day events. As a result, there is an increasing probability of civilian casualty from rocket launch anomalies, or from falling space debris already in orbit.
Hans M. Louis‐Charles +3 more
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Modeling mammal response to fire based on species’ traits
Conservation Biology, Volume 37, Issue 4, August 2023., 2023 Abstract Fire has shaped ecological communities worldwide for millennia, but impacts of fire on individual species are often poorly understood. We performed a meta‐analysis to predict which traits, habitat, or study variables and fire characteristics affect how mammal species respond to fire.
Christopher A. Pocknee +3 more
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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
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Jianzhu Gangjiegou Jinzhan, 2023 螺纹锚固单边螺栓锚固于带螺纹的螺栓孔。螺纹锚固单边螺栓无需螺母，能够实现单侧安装，因此非常适用于闭口截面钢构件的连接。了解不同结构在火灾后的受力性能具有重要的工程意义，能够为受火结构的鉴定和修复提供依据。通过试验研究了螺纹锚固单边螺栓连接节点在火灾后的性能，试验中采用全过程的加载方式，模拟了火灾从开始到结束的过程，并考虑了火灾发生时节点承受的荷载大小和火灾温度对于其火灾后残余力学性能的影响。试验结果表明，螺纹锚固单边螺栓连接节点共有两种破坏模式，分别为钢管壁屈服破坏和T形板翼缘屈服伴随螺栓破坏 ...
闵凡文 +5 more
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