Results 121 to 130 of about 18,390 (212)

模块化钢结构建筑连接技术及鲁棒性研究进展与展望

open access: yesJianzhu Gangjiegou Jinzhan
模块化钢结构建筑凭借标准化、集成化和工业化等优势,迅速得到学术界和工程界的青睐。从模块间连接节点弱、相邻构件协同工作性能差和结构鲁棒性弱三个问题为切入点,归纳国内外模块化钢结构建筑的半刚接和刚接节点,从力学机理和施工安装两个维度论述了现有模块间连接节点的发展与不足,提出了“梁端-柱端混合式连接”的解决思路。针对模块化钢结构建筑的模块间梁-梁、柱-柱协同工作,分析它们与钢-混凝土组合梁和格构柱的异同,在考虑建筑装修及施工的基础上提出了非连续连接组合梁(柱)的解决思路 ...
陈金林   +5 more
doaj   +2 more sources

诊断剂量超声联合超声造影剂照射对体外培养成纤维细胞细胞膜影响的实验研究

open access: yesZhongguo shiyan zhenduanxue, 2007
目的观察超声联合超声造影剂照射对体外培养成纤维细胞细胞膜的影响。方法将6孔板培养成纤维细胞分为对照组、单纯超声照射组、造影剂组、超声联合造影剂组,超声条件为探头频率2.5 MHz,二次谐波模式,机械指数1.6,聚焦3 cm,深度5 cm,照射时间60 s;照射后立即将细胞送电镜室进行扫描电镜观察。其中超声联合造影剂组分为两组,一组于照射后立即进行扫描电镜观察,另一组继续培养24h后再进行扫描电镜观察。结果单纯超声辐射组及造影剂组成纤维细胞形态以及细胞膜的形态结构与对照组相比无显著变化 ...
赵丽荣   +4 more
doaj  

Who Deserves Scarce Health and Education Resources? How Policy Context Shapes Target Group Deservingness

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT The social construction of target populations (SCTP) framework emphasizes the ways in which target populations' levels of political power and deservingness shape the allocation of policy benefits, but less attention has been devoted to the conditions under which the same target population may be considered deserving in one policy context but ...
Elizabeth Bell   +3 more
wiley   +1 more source

Computer Aided Design and Analysis for Large-size Gear-assembly

open access: yesJixie chuandong, 1996
本文对中心传动磨机大型组装式齿轮进行了结构改进、实体造型及整体二维有限元分析,并利用二维分析结果,对齿圈和轮体接合面进行局部三维弹塑性接触有限元计算.通过分析接合面接触状态及连接强度,论证了组装式齿轮改进结构的可行性,经改进后的组装式齿轮已装机出厂。
林腾蛟, 李润方, 张宾
doaj  

From Douyin Shop to TikTok Shop: The Platformized Supply Chain, Spatialized Business Model, and Regional Partnership in Cross‐Border e‐Commerce

open access: yesPolicy &Internet, Volume 18, Issue 1, March 2026.
ABSTRACT This article investigates how TikTok Shop reproduces the e‐commerce model of Douyin Shop against a backdrop of divergent regulatory challenges and geopolitical distrust. One of the strategic changes we observe in TikTok Shop is the shift of consumer goods suppliers from local merchants to China‐based sellers.
Shuaishuai Wang, Jing Meng, Yitong Li
wiley   +1 more source

轻钢龙骨复合剪力墙结构抗火研究进展

open access: yesJianzhu Gangjiegou Jinzhan, 2017
冷弯薄壁型钢房屋建筑结构是公认的绿色与工业化建筑,在我国具有良好应用与发展前景,其相关抗火理论及设计方法得到国内外学者的高度关注。课题组从2003年开始冷弯薄壁型钢结构研究工作,提出了多层轻钢龙骨复合剪力墙结构体系,并对其展开系统试验与基础理论研究。针对轻钢龙骨复合剪力墙建筑结构的若干关键抗火问题,即冷弯薄壁型钢结构主要组成材料及连接件高温性能、冷弯薄壁型钢结构垂直与水平分隔构件耐火试验、数值与解析计算模型等方面,对课题组的最新研究进展进行了介绍,同时指出了今后尚需开展的研究工作。
叶继红, 陈伟
doaj  

Contrasting light demands determine the coordination of plants' non‐structural carbohydrates and economic strategy over the range of solar spectral composition

open access: yesFunctional Ecology, Volume 40, Issue 2, Page 534-552, February 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Non‐structural carbohydrates (NSC) are critical mediators of plant adaptation to fluctuating light environments. They are tightly coordinated with plant economic strategy, that is, leaf economics spectrum (LES) and root economics spectrum (RES).
Lulu Xie   +6 more
wiley   +1 more source

330千伏敞开式组合电器

open access: yesGaoya dianqi, 1976
本文叙述了ZHI-330敞开式组合电器的四种组合方式,介绍了该组合电器的隔离开关部份和所配液压机构的结构、动作原理。还介绍了组合电器的试制过程、三年来的网路运行情况及根据运行经验所做的产品完善化工作。
doaj  

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