Results 61 to 70 of about 23,739 (228)

特高压支柱式电气设备地震响应有限元分析关键动力参数取值

open access: yesDianci bileiqi
对电气设备地震动响应分析应用较多的主要有两种方法——振型分解反应谱法和动力时程法,其中某些关键动力参数的取值在电气设备抗震相关规范中并没有具体规定,实际分析时往往凭个人经验,致使分析结果因人而异、不尽准确。为了在计算分析阶段通过对关键动力参数准确取值,尽可能真实获取结构动力响应,本研究以特高压支柱式电气设备颇具代表性的两种材质的结构本体及加装减隔震装置后的结构为分析对象,在非线性时程分析方面,通过对动力时程法主要参数:振型参与阶数、地震波及峰值加速度的影响对比分析 ...
陈忆前, 潘飞, 彭伟, 刘洋
doaj   +2 more sources

电磁式谐波传动内的电磁场问题(续)

open access: yesJixie 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]

open access: yes, 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  

Recent Advances in Chemical Bath Deposition of Electron and Hole Transport Layers for Perovskite Solar Cells and Modules

open access: yesRare Metals, EarlyView.
ABSTRACT The development of high‐efficiency, stable, and scalable perovskite solar cells/perovskite solar modules (PSCs/PSMs) highly depends on the performance and cost‐effectiveness of functional layers such as electron transport layers (ETLs) and hole transport layers (HTLs).
Baochang Wang   +11 more
wiley   +1 more source

Experimental study on the effect of chitosan dosage on flocculation efficiency of water extract of white peony(壳聚糖投加量对白芍水提液絮凝效果的影响研究)

open access: yesZhejiang 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

Structural Seismic Design and Analysis of High-rise Buildings Based-on Performance Objective and Energy Analysis [PDF]

open access: yes, 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  

Exceptional Electromagnetic Wave Absorption in High‐Entropy Carbides Enabled by Lattice Distortion Engineering

open access: yesRare Metals, EarlyView.
ABSTRACT The growing concern over human health issues, driven by increasingly severe electromagnetic pollution from 5G communication, has made the urgent development of high‐performance electromagnetic wave (EMW) absorbing materials. Although carbide‐based materials are promising because of their conductive and polarization losses, existing single ...
Chenqiang Duan   +9 more
wiley   +1 more source

Comparative Trends of Sociality Among Terrestrial Carnivores: A Multivariate Analysis 陆生食肉动物社会性的比较趋势:一项多变量分析

open access: yesWildlife Letters, EarlyView.
In this study we analyze the role of phylogeny, environment, and community structure on sociality. Using structural equation modeling (SEM) we aim to quantify the direct and indirect impacts of variables on behaviors including social grouping, reproduction, and space use among Carnivora species.
Jessica Ward   +3 more
wiley   +1 more source

Analysis on the damping effect of low yield point steel shear plate in frame structure [PDF]

open access: yes, 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  

The coordination of dehydration tolerance and avoidance in oaks is mediated by leaf habit across a precipitation gradient

open access: yesFunctional 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
wiley   +1 more source

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