Results 41 to 50 of about 25,946 (168)
Jixie chuandong, 1993 四、电磁式谐波传动的时变磁场分析上述分析了电磁式谐波传动内的恒定磁场,即不考虑时间因素的影响。但要分析谐波电机的起动过程,了解其运行状态 ...
颜毅华, 尤竹平
doaj
Study on Seismic Performance of Buckling-Restrained Brace and its Application on Reinforcement of School Building [PDF]
, 2013 防屈曲支撑作为一种新型消能构件，克服了传统支撑受压屈曲、无法充分发挥材料受压阶段的塑性滞回耗能功用的缺点，具有工作原理简单、明确、消能效果好等特点，是一种十分具有应用前景的结构消能构件。本文在国内外相关研究理论和方法的基础上，综合大量文献资料和工程实践经验，对防屈曲支撑做了以下几个方面的研究： 首先，对既有的防屈曲支撑研究进展资料进行构件、组件、结构体系三个层面的归纳与整理，为防屈曲支撑技术的下一步研究奠定理论基础。 其次，对影响防屈曲支撑构件性能的参数进行理论分析与公式推导 ...
姚林利
core
Policy Studies Journal, EarlyView.ABSTRACT As the Narrative Policy Framework (NPF) begins to unpack issues of power and narratives, the main focus has been on power‐over and domination rather than more transformative notions of power‐to and empowerment. This article draws on insights from gender and policy studies and suggests that the NPF benefits from adopting a multifaceted notion ...
Hilda Broqvist
wiley +1 more source
Structural Seismic Design and Analysis of High-rise Buildings Based-on Performance Objective and Energy Analysis [PDF]
, 2012 随着经济的发展和技术的进步，我国高层建筑发展十分迅速，且其规模、高度、复杂性及建设速度也将呈上升趋势，使得抗震设计的难度不断加大。尤其是我国的超限高层建筑的建造速度和高度都受到了世界瞩目，建造高度被突破的时间间隔越来越短。全国各地相继出现了各种形式的高层、超高层、及结构体系复杂的超限高层建筑，如何评估和保证超限高层建筑在地震作用下的安全性和可靠性变得尤为重要。2010新颁布的《超限高层建筑工程抗震设防专项审查技术要点》，重新划定了超限高层建筑的范围；提出了应根据结构超限情况、震后损失 ...
许泽瑶
core
Policy Studies Journal, EarlyView.ABSTRACT Based on the Punctuated Equilibrium Theory (PET) and implementation research, this study proposes an extended conceptualization of policy punctuation that enables researchers to systematically include policy implementation as part of a punctuation. The key mechanisms underlying the PET, i.e., policy image and venue, information processing, and
Bettina Stauffer
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2017 采用紫外/可见分光光度计、激光粒度分析仪、微电泳仪等，探究壳聚糖投加量对白芍水提液絮凝率、分形维数、粒度分布、ζ电位的影响.实验结果显示，壳聚糖投加量为3.2 mL（0.31 g• L-1）时，絮凝率达到最大值80.88%,此时总黄酮损失率为10.67%，上清液平均粒径为5.42 µm，ζ最接近零电位，为—1.168 2 mV，絮体分形维数为1.463；应用激光粒子测速(PIV)系统对絮体的沉降过程进行分析，建立了沉降过程的数学模型，絮凝过程的最大沉降速度为0.324 1 mm • s-1 ...
ZHANGJianwei(张建伟) +3 more
doaj +1 more source
Analysis on the damping effect of low yield point steel shear plate in frame structure [PDF]
, 2017 地震作为一种多发的自然灾害，是人类安居乐业的重大隐患，提升建筑物的抗震性能迫在眉睫。早期模式的建筑物依靠结构自身抵御外界荷载，难免造成主体破损，而添加了各类耗能装置的结构，则可以依靠耗能件有效吸收能量，减小主体结构的破损。 低屈服点钢剪切板作为一种新型材料的耗能件，具备良好的耗能性能，探讨将其应用于工程结构的抗震加固和设计有着重要的意义，笔者为此开展了低屈服点钢剪切板耗能件在框架结构中减震效果分析，具体工作如下： （1）介绍低屈服点钢剪切板耗能件的力学原理，探讨加入剪切板耗能件后结构的抗震分析方法 ...
刘晗
core
Issue Attention in Public Opinion Polls: Pollsters as Agenda Responders and Agenda Setters
Policy Studies Journal, EarlyView.ABSTRACT Polling organizations, like other policy actors, must prioritize certain issues. We argue that, for normative and financial reasons, pollsters prioritize issues that are viewed as important by other institutions and the public, leading them to focus survey questions on issues that are on congressional and media agendas, and which are public ...
Qian Zhang +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan对于大型复杂空间钢结构，可靠的施工过程分析对保障施工安全性和钢结构安装质量具有重要意义。在传统施工过程分析与钢结构直接分析的基础上，提出一种考虑构件和安装模块初始缺陷以及变形累积的钢结构非线性施工过程分析方法。利用NIDA软件将该方法应用于成都某大悬挑钢桁架结构的施工过程分析中，确保了施工方案的可行性。同时，对比分析了非线性施工过程分析、一次成型分析和线性施工过程分析3种分析工况下结构关键节点位移及构件应力情况，并与施工实测值进行了比对。结果表明，一次成型分析与线性施工过程分析的位移较实测值偏小 ...
刘宏伟 +5 more
doaj +2 more sources
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Alkali metal–chalcogen batteries (AMCBs) are one of the most promising next‐generation energy storage systems because of their high energy density and reasonably low cost. However, the practical application of AMCBs is severely hindered by the volume expansion of the chalcogen cathode, the shuttle effect of polychalcogenides, and unstable ...
Yong Liu +11 more
wiley +1 more source