Results 51 to 60 of about 18,571 (176)

Design of Hydro-ski and Numerical Simulation of the Hydrodynamics [PDF]

open access: yes, 2013
地效翼船以其气动效率高、有效载荷大、经济性好、巡航速度快和巡航半径大等优点,占据了超低空和掠海面的飞行空档,拥有广阔的潜在市场和应用前景,市场化和大型化是地效翼船未来发展的必然趋势。但是在地效翼船的发展过程中,必须解决以下两个的关键难题:起飞过程中所需要的跑道较长,起飞过程中升阻比较小,使得船身无法快速抬离水面;降落入水过程中,水对船身的冲击力极大,容易造成船身的疲劳。基于地效翼船的此两种关键技术难题,提出了水橇的概念,在地效翼船上加装水橇,可以有效地解决以上两个技术难题。本文以此为背景 ...
梁峰
core  

Undrained deformation characteristic of saturated soft clay under traffic loading [PDF]

open access: yes
Previous studies on the undrained deformation behavior of saturated soft clay under traffic loading usually ignored the effect of cyclic confining pressure.
Lei SUN, Yuke WANG
core   +1 more source

Dynamic Analysis of a High-rise-Building Structure during an Earthquake Considering Soil-Structure-Interaction [PDF]

open access: yes, 2017
土-结构体系有限元模拟计算分析的复杂性与计算成本,在一定程度上限制了土与结构相互作用分析在高层建筑结构设计中的应用。上部结构数值解与土解析解耦合的土-结构相互作用计算方法,为高层建筑结构提供了有效途径。利用作者提出的耦合算法,对一个钢框架-混凝土核心筒高层结构进行地震作用下的非线性动力分析,讨论了不同强度地震和不同种类地基土对结构地震反应的影响,得出了对实际工程具有指导性意义的结论。The conventional coupling analysis based on a comprehensive ...
卢佳盛, 孙宝印, 李勇
core   +1 more source

Exploring Chinese International Students’ Intercultural Competence in Australian University Classrooms: Challenges and Opportunities

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
wiley   +1 more source

Dynamic Analysis of Dry-jointed Structure—Case Study on Yingxian Wood Pagoda of China [PDF]

open access: yes, 2017
常见的干架结构包括传统的干砌或弱浆砌砖石结构、中国古建筑木结构等空间多体干连接组合结构体系。该类结构由多个块体构件按照一定规则简支叠置,构件间不采用粘结材料形成拉结,借助自重及摩擦力抵抗侧向力。目前对干架结构的研究较少,且已有的对干架结构的数值模拟研究多基于连续杆系结构思想,与实际差异较大。本文从干架结构的特点出发,采用多体动力学及离散单元法对简单的块体干架结构进行分析,进而对中国古代建造的干架结构的典型——应县木塔进行探索。 运用理论力学方法及UDEC离散元软件建模分析,得出了在平面干连接接触 ...
刘星帆
core  

How Different Patterns of Policy Attention Drive Policy Diffusion: Evidence From China's River Chief System

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Despite extensive research on policy diffusion, the ways in which policy attention influences this process remain underexplored. This study addressed this gap by distinguishing between three types of policy attention—political speeches, policy issuance and field visits—and investigating their differential impacts when delivered by central and ...
Xiangning Chen, Yahua Wang
wiley   +1 more source

地震作用下海上风电联接变压器动力模型试验

open access: yesGaoya dianqi, 2022
海上风电联接变压器作为海上风电场的主要设备,其抗震安全性关系到海上风电场的平稳运行。针对海洋平台—附属电气设备在地震作用下的动力传递过程及楼层反应谱研究,以及电气设备的动力响应特性和自身薄弱部位研究,开展了变压器1∶10模型比尺的振动台模型试验研究;模型试验与数值仿真分析结果的对比表明,海洋平台的动力特性会显著影响传递至设备底部的地震加速度的低频部分;结构的应力薄弱部位发生在储油柜下方支架处。基于弹性相似的振动台缩尺模型试验可以反映原型结构的地震动响应特性,为附属设备的抗震反应谱研究提供依据 ...
陈健云   +7 more
doaj  

Dynamic Characteristics of the Galerkin Meshfree Formulation for Mindlin Plate with Stabilized Conforming Nodal Integration [PDF]

open access: yes, 2012
剪切自锁问题一直是考虑剪切变形的Mindlin板数值方法研究中的核心内容。稳定节点积分无网格法通过构造节点光滑曲率和相应的形函数节点光滑梯度,并利用节点积分方法来建立刚度矩阵,其中Mindlin板内能的弯曲部分采用光滑梯度,而对剪切部分则采用直接梯度。该方法能够准确再生Kirchhoff弯曲模式,具有弯曲准确和稳定高效的特点。本文对该方法的动力特性进行了系统的研究,主要包括Timoshenko梁和Mindlin板稳定节点积分无网格法的频散特性以及Mindlin板的时程分析 ...
张一岭
core  

The Inclusion Trade‐Off: Comparing the Design and Functionality of Collaborative Governance Forums

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Environmental challenges require collaboration across jurisdictions, often through forums or intermediary spaces for repeated interaction. A persistent forum design question concerns inclusion criteria, or which actors should be included.
Adam Wiechman   +3 more
wiley   +1 more source

多尺度热工水力分析方法研究及其在海洋核动力小堆中的应用

open access: yesHe jishu
海洋核动力小堆作为未来海洋核能应用的重要形式,其热工水力特性受到周期性流体波动和复杂运动的影响,增加了设计与安全评估的挑战。本研究旨在开发一种多尺度分析方法,通过适应性改造和多层次模拟,系统评估海洋条件下核动力小堆的热工水力行为与安全性。首先,选用STAR-CCM+作为改造系统分析、子通道和计算流体力学(Computational Fluid Dynamics,CFD)等程序的工具,对RELAP5源程序进行了修改,对海洋小堆进行简化建模,以适应海洋环境下的系统行为、组件传热、燃料棒束等关键特性;其次 ...
罗 涵禹, 宋 厚德, 刘 晓晶
doaj   +1 more source

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