Results 101 to 110 of about 16,458 (194)
A model for excess pore water pressure increment in saturated coral sand considering loading frequency [PDF]
In order to predict the generation characteristics of the excess pore water pressure(ue) in saturated coral sand under different cyclic loading frequencies(), a series of consolidated undrained cyclic triaxial tests are conducted on saturated coral sand ...
ZHANG Yunfei1, 2 , ZHANG Lei1, 2 , XIN Shuanglong2, GUO Huiyi2, ZHOU Ruirong3, JIN Dandan4, WANG Binghui2
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How Do I Measure up? Social Influence and L2 Motivation in the Algorithmic Age
International Journal of Applied Linguistics, EarlyView.ABSTRACT Comparative thinking is a fundamental human drive and a hallmark of contemporary life. For social action, such as the learning and use of additional languages, a target for appraisal (an L2 attribute) is evaluated in relation to a comparison standard (an appraiser's standpoint).
Alastair Henry, Meng Liu
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Synthesizing Empirical Research on Learner Metacognition in Second Language Writing
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
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Gaoya dianqi大容量发电机保护断路器是大型发电机组重要的保护装置，其灭弧室内采用主、弧触头异速的运动装置，弧触头系统采用了新型的五连杆机构，文中分析了该运动装置的弧触头系统的受力特性。针对大容量发电机断路器用弧触头系统高速运动、大动力传动且通过分段连续轨道实现异速的特点，首先采用向量和矩阵相结合的解析法计入惯性力；然后研究各段曲线轨道对滚子作用力的共性关系，建立了计入惯性力的通用矩阵模型；最后采用数值分析的迭代法计入摩擦力，获得了异速弧触头系统的动力学特性 ...
王磊, 张文兵, 纪明嵩, 赵倩
doaj
Jianzhu Gangjiegou Jinzhan, 2003 本文研究带中心支撑钢框架结构的地面运动与控制结构反应的结构特性参数之间的关系,并对设计方法和规范进行了优化。文章重点研究了三层和六层带侧向中心支撑的钢框架结构,讨论了这些支撑的力学性能和优点 ...
方明霁
doaj
Study on Structural Behavior of Through and Half-through Arch Bridge Based on CFRP Suspenders [PDF]
, 2017 中下承式拱桥的吊杆长期处于复杂机械振动和大气等作用下，容易受到疲劳与腐蚀等作用的影响而破坏失效。由于碳纤维(CFRP)的抗腐蚀、耐疲劳等特性恰好可以弥补钢材的这些缺点，因而可考虑将钢受拉构件替换成CFRP构件，避免此类问题的发生，并有效降低使用过程中的维护保养成本。另外CFRP材料高强度、轻质量的特点，满足了设计建造超大跨径桥梁和新型结构形式桥梁的要求。本文主要分析了CFRP受拉构件的替换对系杆拱桥结构性能的影响，并针对目前CFRP索的材料性能以及在实际工程应用中的问题，提出了相应解决方案 ...
赵斌
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Research on Dynamic Characteristics of Monopile Offshore Wind Turbine Tower Under Different Wind Speed Conditions [PDF]
Based on the ANSYS finite element software, the NREL 5 MW monopile offshore wind turbine tower system was modeled in 3D. The influence of different wind speeds on the dynamic characteristics of the tower structure was simulated and analyzed under the ...
CHEN Shangnian +4 more
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Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, EarlyView.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
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Gaoya dianqi, 2014 真空断路器关合时真空灭弧室触头熔焊将引起拒分或灭弧室炸裂现象,属于恶性事故。笔者从试验结果出发,提出机构的出力特性与断路器的负载特性匹配问题是真空断路器关合时灭弧室触头熔焊的另一个重要影响因素,分析真空断路器弹簧机构出力特性的影响因素,凸轮轮廓的轨迹和传动机构中四连杆之间的角度严重影响着真空断路器机构的出力特性。通过优化凸轮轮廓的轨迹和传动系统中四连杆之间的角度,使机构的出力特性与断路器的负载特性实现良好匹配,最终解决了断路器关合短路电流时触头熔焊问题。
游一民 +4 more
doaj
The Research of Vibration Control methods based on Benchmark Model structure [PDF]
, 2011 随着社会的发展和技术的进步，越来越多的高层建筑大量涌现出来，这大大缓解了城市用地紧张的问题。但是，由于我国地处地震多发区，随之而来的安全问题逐渐引起人们的关注。结构振动控制为结构抗震设计开辟了新途经，它改变了传统的单纯靠建筑结构自身性能抵御地震荷载的设计思想，通过在结构中附设减振装置来减小建筑结构的动力响应。以往的研究均采用各自的动力学模型针对各自的算例进行分析，各种方法缺乏一个统一的交流平台。本文在以往研究的基础上，以Benchmark模型作为研究对象对被动控制器的优化设计问题进行研究探讨 ...
洪志
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