Results 71 to 80 of about 18,390 (212)
Jianzhu Gangjiegou Jinzhan五边形三四撑杆全铰接弦支网壳区别于多撑杆索穹顶结构，是将索穹顶结构上层脊索转换为脊杆，形成一种由预应力索、杆组合而成的全铰接曲面双层网格结构体系，便于铺设刚性屋面，减少造价。与传统网壳结构相比，该结构具有良好稳定性和施工便宜性的特点。该结构下弦节点设置三根或四根撑杆，有效提高了整体结构的侧向刚度和稳定性，同时采取铰接节点形式连接，简化节点构造，便于张拉施工。针对五边形三四撑杆全铰接弦支网壳结构，建立ANSYS有限元模型，分析在不同组合工况下该结构索杆内力变化与位移规律。同时 ...
李丹, 吕辉, 董石麟, 朱忠义
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Rare Metals, EarlyView.ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang +4 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 more
wiley +1 more source
Gaoya dianqi, 1966 本文介绍了CT-3型弹簧操动机构的技术参数,结构、动作原理,控制线路,及其试验数据。这种机构不需要直流电源,可用交流电源或手动进行分、合闸操作,可节约电站投资,由于改造了合闸弹簧特性,它能够很好地与断路器反力特性相配合。
西安高压开关厂弹簧机构三结合小组
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Rare Metals, EarlyView.ABSTRACT The development of high‐performance and stable electrocatalysts for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) plays a critical role in advancing clean energy technologies, including metal‐air batteries and hydrogen production through overall water splitting.
Chen‐Yu Cai +4 more
wiley +1 more source
纳米HA/CS支架穿“靴”复合软骨样细胞修复兔关节软骨和软骨下骨缺损
Zhongshan Daxue xuebao. Yixue kexue ban, 2012 【目的】观察把骨髓间质干细胞(BMSCs)诱导成的软骨细胞与纳米羟基磷灰石/壳聚糖支架(nano-HA/CS scaffold)通过特殊的穿“靴”结构复合构建而成组织工程软骨复合体的可行性,并观察此复合体修复兔膝关节软骨及软骨下骨缺损的能力。【方法】原位复合和冷冻干燥相结合的方法制备nano-HA/CS 支架,用聚四氟乙烯制作成圆柱形“靴”结构。把BMSCs经软骨诱导液诱导成软骨细胞后,接种于穿“靴”的nano-HA/CS 支架底部,把细胞-支架复合物置入成软骨条件培养液中培养2周。扫描电镜观察nano-
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Rare Metals, EarlyView.ABSTRACT Single‐atom catalysis hinges on fundamental challenges in precisely controlling metal‐support interactions and rationally regulating metal–adsorbate relationships. Herein, we report a universal strategy for constructing highly efficient and well‐defined Cu(I) single‐atom catalysts based on a trifurcate AlL3 molecular support.
Donghui Zhang +9 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan五边形三四撑杆全铰接弦支网壳结构相较于多撑杆索穹顶结构，其核心差异在于通过将索穹顶结构上层脊索转换为脊杆，形成由预应力索与杆组合而成的全铰接曲面双层网格结构体系，该体系既便于刚性屋面铺设，又能降低造价。与传统网壳结构相比，该结构具有良好的稳定性和经济性等特点。在该结构的下弦节点布置3根或4根撑杆，可有效提高整体结构的侧向刚度和稳定性；同时采取铰接节点的连接形式，既能简化节点构造，又便于张拉施工。针对五边形三四撑杆全铰接弦支网壳结构，文中建立了ANSYS有限元模型 ...
李丹, 吕辉, 董石麟, 朱忠义
doaj
Shiyou jixie, 2014 针对传统潜油螺杆泵用驱动电机在制造、运行以及维修等方面存在的问题，提出一种潜油螺杆泵直驱超细长比单元组合式永磁电机。在介绍该种电机的组合方式和结构特点之后，采用场路结合的方法进行了电机电磁设计，并利用有限元法分别对电机定、转子结构进行优化设计，得到了电机的空载磁场特性，最后对样机进行了空载反电势和负载测试试验。样机试验结果验证了场路结合计算方法的准确性和电机定、转子结构优化设计的有效性。理论研究结果和样机试验结果对比表明，该种单元组合式永磁同步电机结构可行，可广泛应用于潜油螺杆泵直驱系统中。
张炳义 +4 more
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Rare Metals, EarlyView.ABSTRACT High‐entropy alloys (HEAs) have attracted considerable interest from researchers owing to their tunable chemical compositions, exceptional structural stability, and promising catalytic properties. However, their large‐scale application is often hindered by complex manufacturing techniques and poor durability.
Sheng Guo +9 more
wiley +1 more source