Results 51 to 60 of about 636,519 (177)
Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
wiley +1 more source
, 2004 本文以尾流振子模型为基础,通过改进Lyong的半经验公式法,研究了张力腿的张力变化以及流场分布对张力腿涡激振动响应的影响.计算结果表明,张力腿的张力改变,使各阶模态的锁频区域分布发生变化,从而改变了结构的涡激振动响应;流场分布的响应计算表明,同样的流场分布对不同阶模态的激励作用的效果不同 ...
王艺, 陈伟民
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Jixie chuandong, 1991 本文对一完整双联斜齿轮在动载荷和离心力作用下结构中的位移和应力场进行了计算研究。首先建立了双联斜齿轮的三维有限元模型,用[1]中的方法求得了相应结构振动最低几阶固有频率及振型。用模态坐标变换将有阻尼弹性系统二阶常微分有限元动态运动方程组转换成无耦合微分方程,根据系统计算出的真实动载荷用振型叠加法计算了双联斜齿轮的稳态响应。本文还研究了离心力对齿轮位移及应力分布的影响,并与齿轮结构中的动位移及动应力进行了对比分析。全文的计算是在微机上完成的。
刘更, 何大为, 沈允文, 高向群
doaj
Gaoya dianqi, 2021 为探究网侧设备对±800 kV换流变地震响应的影响,以某典型换流变—套管体系为对象,建立其单体有限元模型以及考虑网侧设备连接的耦联模型。网侧套管顶部滑动连接金具采用滑动接触单元进行了模拟,计算分析了地震作用下模型前20阶模态以及套管加速度、位移、应力响应。结果表明:①特高压换流变—套管体系前20阶频率接近地震卓越周期,震中易发生类共振;②网侧设备对换流变阀侧套管地震响应无影响,但会显著放大网侧套管顶部位移响应和根部应力响应;③地震作用下,网侧套管顶部连接金具内部的相对滑移响应显著。因此 ...
杨旭 +5 more
doaj
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The strength and ductility trade‐off in titanium matrix composites (TMCs) is a critical factor limiting their widespread application. In this study, a (TiB + TiC)/Ti–6Al–4V composite with an optimal balance between strength and ductility was engineered via multi‐directional forging.
Chunyu Shen +8 more
wiley +1 more source
Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 2, June 2026.ABSTRACT The article examines how ‘soft’ information functions in rational organisations that emphasise hard information, and how this affects safety. Drawing on fieldwork in a high‐security prison, we analyse how frontline personnel interpret soft information about potential disturbances. We identify three coexisting institutional logics shaping these
Grethe Midtlyng +1 more
wiley +1 more source
, 1997 讨论和总结了结构塑性动力响应中的相似方法以及进行模化实验所应遵循的原则，对冲击载荷下多种结构塑性动力响应的实验研究进行了简要综述．中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)00339 ...
方竞, 赵亚溥, 余同希
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, 2007 基于Biot多孔介质波动理论和Cauchy初应力分析结果给出横观各向同性介质初应力存在的本构方程。利用位移标量势函数得到介质中膨胀波传播的四个波速。通过数值计算研究初应力和孔隙压力存在对膨胀波传播特性的影响 ...
李世海, 马维
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A Global Analysis of Domestic Military Policies Governing Responses to Public Health Emergencies
World Medical &Health Policy, Volume 18, Issue 2, June 2026.ABSTRACT Throughout the COVID‐19 pandemic, militaries mobilized at an unprecedented scale to support domestic response efforts. This was consistent with the growing trend of asset mobilization for military operations other than war during public health emergencies.
Kuang Yu Hu +4 more
wiley +1 more source
, 1983 本文用 Split-Hopkinson 压力杆装置研究了应力波通过破裂岩石试件的衰减现象。给出了灰砂岩、石灰岩两种岩石动态的破裂强度与应力应变关系.结合受应力作用的岩样切片的微观观察,对应力裂纹 ...
章根德
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