Results 21 to 30 of about 11,578 (167)
Dianci bileiqi, 2018 金属氧化物避雷器作为过电压保护设备,对电力系统绝缘配合起着关键作用。金属氧化物避雷器的能量吸收能力是避雷器的重要特征性能,决定着其保护特性和自身的运行安全,已引起使用部门和制造者的普遍关注。避雷器的能量吸收能力主要取决于电阻片的能量吸收能力,在运行和试验过程中,电阻片会有哪些破坏形式,哪些因素会影响到电阻片的能量吸收能力,本文对此进行初步试验探讨。试验结果显示,电阻片的主要破坏形式有贯穿、开裂、闪络,影响电阻片能量吸收能力的主要因素有电阻片的起始温度、热容量、能量注入的形式。
艾三 +5 more
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Studies on Preparation and Photoluminescence Properties of Mn4+-doped Fluoride Red Phosphors for White Light Emitting Diodes [PDF]
, 2016 自1990s以来，白光发光二极管(whitelightemittingdiode，WLED)的快速发展得益于高亮度GaN基蓝光LED的成功研制。目前，WLED以其高效节能、绿色环保、安全耐用等优点，当仁不让地成为了打造节约型社会环境下照明行业的新宠，被誉为继白炽灯、荧光灯和高强度放电灯之后的第四代照明光源。但当前的WLED不是因缺乏红光成分而导致显色指数偏低，就是因红粉效率较低而导致发光效率偏低。因此，亟需具有高效窄带的红色荧光粉以弥补当前WLED的不足。 本文选择复合氟化物K2MF6(M=Si，Ge ...
陈文威
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He +9 more
wiley +1 more source
Dianci bileiqi, 2018 220 kV及以上线路常用防雷措施是安装避雷器,需要分析线路遭受雷击后避雷器能量吸收情况以达到合理防护效果。利用EMTP软件搭建220 kV输电线路模型,考虑杆塔接地装置冲击特性,比较线路发生雷击反击和绕击时避雷器的残压与通流,讨论改变杆塔接地装置尺寸、线路档距、线路工作电压相位角等因素对避雷器吸收能量的影响。分析结果表明:线路发生反击时,避雷器残压与通流波形振荡不如绕击时剧烈,吸收的能量也远低于绕击;反击时,避雷器吸收的能量随着接地棒长度的增加而降低,而绕击时,吸收的能量随着接地棒长度的增加而增大 ...
曹冰, 任全会, 肖扬
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, 2018 为摩托车头盔的安全性设计,需要研究在冲击载荷下内衬泡沫的能量吸收能力对摩托车头盔防护性能的影响。该文建立了有限元数值分析头盔模型,依据欧洲经济委员会(ECE)的法规ECE R22.05的动态测试方法,验证该模型的有效性。改变头盔不同测试点下的泡沫密度,进行了12个跌落的仿真试验。结果表明:在头盔的前部、冠部和后部测试点区泡沫密度由40 kg/m3增加到80 kg/m~3时,泡沫的能量吸收能力逐渐增大,头部冲击能量衰减得更快,导致3个测试点头部颅骨骨折的风险从25%、55%、39%分别增大至53%、96%、
何伟 +4 more
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Impact resistance performance of rockbolt system with(out) rubber cushion energy absorbing and buffering components [PDF]
The practice of impact resistance support in dangerous roadways has shown that energy absorbing and buffering components can improve the impact resistance performance of rockbolt support systems. A rubber cushion layer was used as an energy absorbing and
Fuqiang GAO +8 more
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A Multifunctional Reducing Molecular Dopant for 16% Efficient Tin Perovskite Solar Cells
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Although lead‐based photovoltaics have seen remarkable progress, tin‐based perovskite solar cells (Sn‐PSCs) continue to face challenges due to their limited power conversion efficiency and insufficient operational stability. The primary cause of this performance gap is the susceptibility of Sn2+ to oxidation, which promotes rapid defect ...
Xianyong Zhou +12 more
wiley +1 more source
Dianci bileiqi, 2016 以220千伏电缆为研究对象,在末端单相接地的情况下,应用PSCAD/EMTDC软件,对一些参数,如:接地电阻,引线电感,源阻抗比,和避雷器的额定电压等对避雷器吸收能量特性的影响进行了研究,并对避雷器的能量吸收能力的选择进行了讨论。研究结果表明:避雷器吸收的能量受接地电阻和避雷器额定电压的影响较为显著,源阻抗比影响较小,引线电感基本无影响。同时,计算结果还表明,额定电压越低,避雷器承受的能量更多,对其能量吸收能力的要求越高。
徐海涛 +3 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The growing concern over human health issues, driven by increasingly severe electromagnetic pollution from 5G communication, has made the urgent development of high‐performance electromagnetic wave (EMW) absorbing materials. Although carbide‐based materials are promising because of their conductive and polarization losses, existing single ...
Chenqiang Duan +9 more
wiley +1 more source
Dianci bileiqi, 2006 研究了直流避雷器用电阻片能量吸收能力及热稳定性能。试验表明,在多次过电压下,电阻片吸收操作过电压临界能量吸收能力为432kJ;直流电阻片的近似比热容为3J/（g.K）;达到临界能量吸收时,电阻片表面温度最高为178℃。制造直流避雷器用电阻片时,应确保电阻片具有较大的热容量和较小的温度系数;设计结构时,应考虑避雷器具有较好的散热性能,对于靠近电阻片的材料,应具有耐受热冲击温度为180℃的能力。
张西元 +4 more
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