Results 21 to 30 of about 8,418 (178)
Efficient Simulation Methods for Reinforced Concrete Columns with Encased Steel in High-rise Building Structures [PDF]
, 2016 型钢混凝土柱在建筑结构中往往是主要的承重构件之一，使用合适的数值模型分析其力学性能对高层结构抗震分析有重要的意义。本文综述了目前文献中已有的低含钢率恢复力模型相关研究，分析了其理论、计算流程和算法，并在通用有限元软件OpenSees中编程实现。本文详细推导了模型中基本参数的确定方法，并用于模拟实际高层建筑结构中的型钢混凝土柱。首先，本文用恢复力模型模拟了单根型钢混凝土柱的试验，通过对比验证了模型的精度，研究了其计算效率。其次，本文将恢复力模型用于理想32层高层结构中的单排型钢混凝土构件静、动力分析中 ...
曾志弘
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The Two Faces of Introgression in Conservation Biology 基因渗入在保育生物学中的双重面貌
Integrative Conservation, Volume 4, Issue 3, Page 339-344, September 2025.Conservation biologist need to take into account the various aspects of introgression in their attempts to protect the species integrity and evolutionary potential of threatened species. To do so, they have to overcome the bias created by the Mayrian species concept that considers species as having distinct gene pools.
Harald Schneider, Charles H. Cannon
wiley +1 more source
Dizhen xuebao本文基于荷载路径法，利用节点位移和承载力对主厂房山墙结构中的关键柱进行判别，然后采用静力与动力非线性分析方法，讨论了山墙结构的塑性铰以及失效柱竖向位移和转角变化，并对剩余结构的抗连续倒塌性能进行了分析。结果表明：关键柱的边柱失效对于剩余结构抗连续倒塌能力的影响更大，与构件重要性分析的结果相一致；静力非线性分析因考虑了荷载放大效应，其预测的抗倒塌能力普遍高于动力分析结果。相较于增加配筋量或增大截面尺寸的传统方法，增加斜杆或优化支撑布局对提升核电站常规岛主厂房框排架结构的抗连续倒塌和变形能力更有效。
Pengfei Qi +4 more
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Investigation of A Low-frequency Piezoelectric and Electrostatic Hybrid Vibration Energy Harvesting Technology [PDF]
, 2015 无线传感网络技术的发展要求更持久的供能，传统的电池体积大，寿命短，逐渐无法满足技术进步的需要。能量收集技术可以将环境中的振动能源收集转换为电能，其寿命长，无须更换，实现电子器件的自供能，是一种较为有前景的替代传统电池的技术。 根据线性质量弹簧阻尼系统理论，本文深入分析了两种主要的振动能量收集方式：压电式能量收集及静电式能量收集，分别建立了其数学模型，并在此基础上设计了一种兼具有压电式和静电式收集原理的的复合式振动能量收集器。同时，成功设计了三种非线性复合式能量收集器结构和双电容结构 ...
邓志强
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Predicting fidelity and treatment outcomes in savoring interventions among mothers of young children
Infant Mental Health Journal: Infancy and Early Childhood, Volume 45, Issue 5, Page 497-515, September 2024.Abstract Savoring impacts parents’ emotions and parent–child relationship quality. Using data from a randomized controlled trial (N = 164 mothers of 18–27‐month‐olds, 37 interveners) conducted with a community sample in the United States, this study examined predictors of fidelity and treatment outcomes across two savoring preventative interventions ...
Jessica L. Borelli +3 more
wiley +1 more source
Load Spectrum Compiling Based on Operation Section Recognition and Fatigue Life Prediction of Wheel Loader Axle Shaft [PDF]
, 2017 为改进轮式装载机可靠性及耐久性设计中数据清洗和分析的方法,以装载机半轴为对象,优化载荷信号去噪和作业段识别的方法。利用小波自适应阈值法去除实测载荷的噪声尖峰和突变信号,并通过迭代平滑滤波法搜寻单个作业周期内同步载荷信号的极值点,识别、划分作业段为＂行走段-铲掘段＂。结合雨流计数和频次外推法编制载荷谱,有限元静力分析,以及Miner准则对装载机半轴进行疲劳寿命分析。结果表明：雨流计数的均幅值结果符合正态分布和三参数威布尔分布的假设性检验,疲劳分析损伤最大节点出现在万向节叉连接处,其寿命为7.22×10 ...
侯亮 +4 more
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Multiple‐stressor effects on leaf litter decomposition in freshwater ecosystems: A meta‐analysis
Functional Ecology, Volume 38, Issue 7, Page 1523-1536, July 2024.Read the free Plain Language Summary for this article on the Journal blog. Abstract Recent years have witnessed a surge in research on the effects of multiple stressors in freshwater ecosystems. While studies have increased, the synthesis of their findings into a broader understanding of ecosystem‐level effects remains an ongoing endeavour. Leaf litter
Graciela Medina Madariaga +6 more
wiley +1 more source
A case for stronger integration of physical landscape processes in conservation science and practice
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract I argue that the dynamic nature of contemporary, landscape‐shaping (geomorphic) processes deserves more consideration in conservation science and practice. In an analysis of a sample of fundamental terms related to geomorphology and area‐based conservation in the Web of Science, I found that the terms co‐occurred in <2% of the analyzed entries
Piotr Cienciala
wiley +1 more source
Dianci bileiqi, 2015 根据1 100 kV瓷套型避雷器机械性能要求,从力学分析角度,建立瓷套型避雷器的静力学和动力学分析模型,采用有限元法进行静力弯曲试验和动力学仿真分析。静力学、动力学仿真计算数据与产品试验数据的对比研究表明:静力学、动力学仿真计算建模及计算方法准确;1 100 kV瓷套型避雷器设计满足工程需求。
刘朝丰 +5 more
doaj
户外1100kV GIL薄壁管壳结构柔性设计及温升形变试验研究
Gaoya dianqi, 2023 针对南阳站中国首台/套户外1 100 kV特高压气体绝缘金属封闭输电线路(GIL)，文中首先介绍了户外特高压GIL管壳结构的几何构型特点和静力学服役特性；然后，结合相关行业标准，从弹性力学角度分析评述了户外特高压GIL管壳结构的柔性设计技术和应力强度分析理论，并梳理了南阳站户外特高压GIL管壳结构强度试验的不足之处；最后以南阳站1 100 kV户外GIL管壳结构为试验研究对象，于中国首次进行了基于温升应变的日照环境下户外GIL壳体结构的温升形变试验研究，并应用热应力和第三强度分析理论 ...
马云瑞 +11 more
doaj