Results 11 to 20 of about 18,271 (204)
Research on dynamic properties of a cable-truss pre-stressed dome(索-桁预应力穹顶结构的动力性能研究)
Zhejiang Daxue xuebao. Lixue ban, 2003 索-桁结构是一种有潜力的空间结构,但目前的研究尚不够深入.本文提出了一种圆形平面索-桁预应力结构,采用反应谱法和时程法分析,研究了其动力性能.结果表明,该种结构的频谱极为密集,振型较为复杂;这类结构采用反应谱法计算动内力将导致不可接受的误差,而应采用相应的时程分析法计算动内力.同时还得出了这种结构预应力的施加不可缺少,否则将有可能导致动力破坏的结论.
GAOBo-qing(高博青) +1 more
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Advances in Elemene Nanodelivery Systems: From Material Design to Disease Treatment
Rare Metals, EarlyView.ABSTRACT Elemene (ELE) is a bioactive sesquiterpenoid extracted from traditional Chinese herbs, demonstrating broad‐spectrum antitumor, anti‐inflammatory, and analgesic properties with significant therapeutic potential. However, its clinical utility is constrained by inherent physicochemical limitations, including volatility and hydrophobicity, which ...
Xiao Wang +9 more
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Rare Metals, EarlyView.ABSTRACT Converting CO2 to CH4 under mild conditions is a promising strategy for solving environmental and energy problems, but also a challenge. In this work, the low‐temperature CO2 hydrogenation process over Ni/CeO2 catalysts was significantly accelerated by optimizing the H2 dissociation ability of Ni through the size effect, thus A‐Ni/CeO2 with an
Yu Xie +8 more
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Dual‐Stage Heat Treatment for Enhanced Hydrogen Storage Properties of Mg−Ni−Y Alloys
Rare Metals, EarlyView.ABSTRACT Mg−Ni−Y alloy is considered to be one of the most promising hydrogen storage materials, but its high dehydrogenation energy barrier hinders its practical application. A dual‐stage heat treatment (490°C × 4 h + 550°C × 4 h) is applied to optimize the microstructure and hydrogen storage performance of a vacuum‐melted Mg94Ni3Y3 alloy.
You Lv +6 more
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Gaoya dianqi, 2022 特高压换流变压器是换流站的关键设备,套管是影响换流变抗震性能的一个重要组件。为评估换流变套管的抗震性能,建立了±800 kV换流变—套管体系的精细化有限元模型,获得了体系的动力特性和地震响应,研究了套管内部导电杆预拉力对套管动力特性和地震响应的影响。结果表明:当套管内导电杆所受预拉力较小时,结构基本振型表现为导电杆的振动,加大预拉力可有效提升套管自振频率;适当增加导电杆预拉力,可以显著减小地震作用下导电杆与套管内壁的相对位移响应,有利于提高套管电气性能,且对套筒应力响应无明显影响 ...
陈星 +5 more
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A Multifunctional Reducing Molecular Dopant for 16% Efficient Tin Perovskite Solar Cells
Rare Metals, EarlyView.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
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
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Jianzhu Gangjiegou Jinzhan, 2015 对铰接半刚性结构找形、找力分析,提出一种精确的非线性有限元方法.分两步建立找形与找力分析迭代公式。第1步:基于荷载态节点坐标、预应力态节点坐标及预应力态单元预应力,建立荷载态结构非线性平衡方程,根据矩阵微分理论、Newton切线法概念和边界条件求解荷载态结构非线性平衡方程,从而得到预应力态节点坐标迭代公式;第2步:基于预应力态节点坐标、零态节点坐标和预应力态单元预应力,建立预应力态结构非线性平衡方程,同样根据上述理论和概念以及边界条件求解预应力态结构非线性平衡方程,从而得到零态节点坐标迭代公式 ...
刘树堂
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Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Forests worldwide are increasingly impacted by drought due to climate change, prompting plants to adapt through dehydration tolerance (DT) and avoidance (DA), two distinct physiological strategies.
Xingyun Liang +11 more
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Jianzhu Gangjiegou Jinzhan, 2018 预应力部分外包组合结构是预应力钢-混凝土组合结构的一种特殊形式,有自重轻、跨度大、截面尺寸小和节约材料等特性,能够很好地提高构件的承载力。对8根部分外包组合简支梁进行了承载力试验研究,其中包括6根预应力和2根普通部分外包组合简支梁。研究表明:横截面面积越大预应力部分外包钢的抗弯承载力越高;而且预应力部分外包组合简支梁相对与普通部分外包组合简支梁,抗弯承载力和变形能力有很大的提高。在试验研究的基础上,提出了预应力部分外包组合简支梁承载力建议计算公式 ...
邓宇, 张鹏, 张祥宁, 和真理
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