Results 21 to 30 of about 9,264 (142)
, 2004 骨中有机成分特别是胶原对其生物力学性质具有重要影响。骨中胶原的物理化学和生物学性质的变化均会导致骨的变形和断裂的危险性的增加。然而,胶原的影响往往易被忽视。本文综述了近年来胶原变性对骨的变形和断裂行为影响的研究进展。分析了胶原变性的一些主要影响因素(如年龄、激素、辐射、病变和药物等),进一步分析了由于胶原的变性而引起的胶原纤维排列方向的改变、多肽链的异构化、三级螺旋结构的破坏以及交联物含量的减少等因素最终导致骨变形与断裂的微观机制。 【英文摘要】 The organic phase in bone ...
冯祖德, 廖颖敏, 张其清
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Calculation of slope stability of fault-containing slopes under the action of cyclic blast vibration [PDF]
In order to accurately quantify and predict the evolution of slope stability of fault-containing slopes under the long-term effect of blasting vibration, and to realize the safe, efficient and sustainable mining of open-pit mines. Taking an open-pit mine
Dong WANG +3 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, 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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, 2014 彼得·希格斯(Peter Higgs)是英国著名的理论物理学家,因是希格斯机制的主要贡献人之一及以其名字命名的希格斯粒子而闻名于世。彼得·希格斯与弗朗索瓦·恩格勒(Francois Englert)共同获得了2013年诺贝尔物理学奖。文章简要介绍了彼得·希格斯的生平,希格斯机制的提出以及希格斯粒子命名的由来。此外 ...
刘金岩
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Research progress of rock mechanics in deep mining [PDF]
With the gradual development of coal mining into deep strata, the large deformation failure and strong dynamic impact disasters of surrounding rock caused by deep mining are becoming more and more serious.
Manchao HE +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, 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 2, February 2026.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
wiley +1 more source
Gaoya dianqi, 2001 本文依据国内外有关的模拟试验和计算研究成果 ,结合生产实际 ,分析了影响ZnO电阻片能量吸收能力的各种因素 ,介绍了几种提高ZnO电阻片能量吸收能力行之有效的方法。
郭洁
doaj