Results 21 to 30 of about 8,910 (170)
, 2018 进行了4个圆中空夹层钢管混凝土中柱节点的低周反复加载试验,分析了端板类型和柱截面空心率的影响,研究了此类节点的破坏模式和滞回性能。通过有限元软件建立了节点数值分析模型。考虑了材料本构关系和复杂接触问题,对此类节点进行了受力性能分析。分析结果与试验结果对比吻合较好。研究结果表明:圆中空夹层钢管混凝土柱单边螺栓端板连接节点具有良好的滞回性能、延性和耗能能力;根据欧洲规范EC 3,此类节点呈现出半刚性、全强度的特性 ...
张娜, 张猛, 王静峰
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Informing spatial conservation prioritization with species’ traits
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract New Guinea, the most botanically diverse island on the planet, is the location for one of the boldest conservation initiatives. The Manokwari Declaration aims to achieve 70% conservation designation for the Bird's Head Peninsula. This is 40% higher than the 2022 Global Biodiversity Framework target.
Liam A. Trethowan +27 more
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Emerging Risks and Housing Affordability Policy in Miami High‐Rises
Journal of Critical Infrastructure Policy, Volume 7, Issue 2, Fall/Winter 2026.ABSTRACT Recent advances in satellite‐based remote sensing and building performance measurement have raised critical questions regarding the long‐term settlement behavior of high‐rise structures situated on the complex subsurface of southeastern Florida.
Jean‐Pierre Bardet, Jeffrey Dorfman
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海洋工程平台塔架结构中，圆形截面中空双钢管是主要受力构件，其受压性能和耐腐蚀性能工程界十分关注。为研究圆中空夹层不锈钢管水泥砂浆短柱的轴压力学性能，以外不锈钢管壁厚、内碳素钢管直径和是否含夹层水泥砂浆为试验变量，共设计了12根短柱试件。分析各试件的破坏情况、荷载-位移曲线、承载力、变形性能及应变特征，研究不同变量对极限承载力的影响规律。结果表明：试件破坏形式为外钢管端部或中部局部屈曲破坏；随着不锈钢管壁厚的增大，试件的轴压承载力近似呈线性增长；夹层水泥砂浆对试件力学性能影响较大，可有效提高试件承载力 ...
乔崎云, 曹万林, 翟宏磊
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Gaoya dianqi, 2023 一般认为，干式空心电抗器的噪声频谱为谐波电流各频率之间的差频、合频及每个谐波的二倍频，然后实际测试得到的噪声频谱与目前理论分析的结果并不一致。文中以一台小型的干式空心电抗器为例，对噪声测量过程中的干扰现象进行了研究，并结合电磁感应理论对干扰的来源进行了解释和分析。研究结果表明，干式空心电抗器在加载单频的激励电流时，利用传声器测得的噪声频谱中除了电流频率二倍频的噪声分量外，还会出现多个电流整数倍频率的干扰分量。其中单倍频的干扰分量来源于磁场对传声器的影响，其幅值和加载电流成正比 ...
陈硕 +4 more
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Laser‐Driven Halide Exchange and High‐Resolution Multicolor Patterning of Perovskite Films
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Translating the excellent properties of metal halide perovskites (MHPs) into practical flexible optoelectronic devices requires high‐resolution multicolor patterning techniques that are compatible with post‐fabrication processing. However, such a capability has remained elusive.
Shu Yang +6 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
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Gaoya dianqi, 2019 针对干式空心电抗器匝间绝缘故障,采用磁矢位法对故障状态下空心电抗器电感量进行了分析。在分析过程中,考虑到故障线圈中环流所形成的磁场对干式空心电抗器电感量影响下,得出故障状态下干式空心电抗器电感量计算的精确解析表达式。在此基础上,利用电磁仿真软件MAGNET对干式空心电抗器磁场及故障线圈环流进行仿真分析,并对相同故障状态的电抗器进行不同频率下的电感量测量。由仿真和测试结果表明:故障线圈环流对干式空心电抗器电感量影响较大,其影响随着频率增大而增大,最终趋于稳定 ...
陈炯 +4 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He +8 more
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Gaoya dianqi, 2020 车载油浸式空心电抗器进行特高压GIL交流耐压试验时工作电流大,绕组发热功率高。为避免过热故障,研究耐压试验情况下车载油浸式空心电抗器的瞬态温度场十分必要。文中应用有限元法耦合计算了二维轴对称电抗器模型的瞬态温度场和绝缘油瞬态流体场,分析了车载油浸式电抗器的温升和散热特性。车载油浸式空心电抗器依靠绝缘油自然对流散热速率有限,文中计算了两种辅助优化散热措施。外部吹风辅助散热措施易于实现,但散热速率提高有限。环境温度降低辅助散热实现难度适中,降温效果好于外部吹风辅助散热 ...
赵科 +5 more
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