Results 71 to 80 of about 841,672 (145)
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Globally, there is collective agreement on the need to advance equity within food systems to promote health equity, food security, and social justice through structural transformation. Food systems are shaped by power asymmetries across scales and actors, which influence the realization of the right to food and constrain the agency of ...
Joan Kaburia, Susan J. Elliott
wiley +1 more source
International Journal of Applied Linguistics, Volume 36, Issue 4, Page 3029-3039, November 2026.ABSTRACT This study examines how foreign language teachers’ beliefs about the medium of instruction and translanguaging evolve over time by revisiting three in‐service teachers twelve years after their initial interviews. Using a qualitative longitudinal design, the study traces how translanguaging was initially framed as pedagogically deficient but ...
Danping Wang
wiley +1 more source
, 2007 以防涡激振动(VIV)为目的,围绕阿基米德原型桥的初步设计,讨论了SFT的动力响应问题。参照现有文献简要介绍了VIV的相关参数,以及轴向力作用下梁振动特性;分析了局部缺陷对连续梁振动特性的影响 ...
张双寅
core +2 more sources
Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, Volume 54, Issue 4, November 2026.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
Review of Policy Research, Volume 43, Issue 6, November 2026.ABSTRACT Nature conservation conflicts increasingly extend beyond ecological objectives to disputes over decision‐making legitimacy, institutional authority, and competing understandings of landscape and expertise. This article examines the conflict over the proposed designation of Křivoklátsko as a national park in the Czech Republic between 2021 and ...
Filip Simon
wiley +1 more source
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
Haiyang gongcheng zhuangbei yu jishu, 2018 影响张力腿平台（TLP）张力腿疲劳寿命的一个主要根源就是海流引起的涡激振动（VIV），因此合理准确的涡激振动疲劳分析对张力腿疲劳寿命的预测具有重要的意义。首先对张力腿涡激振动响应的数学模型和应力-寿命（S-N）曲线方法进行了理论论述，随后给出了采用Flexcom和SHEAR7软件进行张力腿涡激振动疲劳分析的分析流程，最后针对某TLP在位期间海流导致的张力腿涡激振动疲劳进行了算例分析。
刘玉玺, 黄怀州, 刘钊
doaj
野生动物学报在人类世，人类活动的不断扩展和加剧，使野生动物的生存环境发生了巨大变化。这些变化不仅影响了野生动物的生存和繁衍，还对其体色适应产生了深远影响。体色作为动物适应环境的重要特征之一，对野生动物的生存至关重要。栖息地破坏、全球气候变暖、城市化和环境污染等人为活动因素导致的环境快速变化，破坏了动物基于颜色的伪装、通讯和体温调节等能力。动物改变体色增强反捕食和体温调节适应能力，但环境变化的速度超过很多动物的体色适应速度，种群面临强大的生存压力。未来的研究应该综合考虑不同干扰类型的影响、人为活动造成的生态系统破坏 ...
赖馥茜 +7 more
doaj +2 more sources
, 2016 竖向地震动对地震边坡稳定性有很大影响,基于此,设计了基覆边坡的模型试验(水下爆炸振动),对界面光滑无支挡结构(A坡)、界面光滑有支档结构(B坡)及界面粗糙无支挡结构(C坡)三种类型基覆边坡概化模型的破坏模式和竖向加速度响应特征进行了研究。利用加速度比这个无量纲量描述测点加速度响应的主要特征,在此基础上对比分析三种结构的基覆边坡的破坏模式、加速度响应特征和桩板墙的土压力分布。结果表明:三种边坡的表层松散土体均产生碎屑流状的下滑滚动,且C坡最明显,A,B坡沿交界面错动且在覆盖层顶部可以看到明显的下错现象 ...
李世海, 张青波
core +2 more sources
, 2007 论证了张力腿平台（TLP）在波浪作用下发生有限振幅运动时，所受惯性力、粘性力、浮力等载荷不仅与波浪场有关，还与瞬时响应有关，是响应的非线性函数；张力腿拉力也是各自由度位移的非线性函数．所以分析唧受力时必须考虑平台的瞬时加速度、速度和位移，在瞬时位置建立运动方程．据此推导出TLP发生有限振幅运动时的外力计算公式，建立了TLP 6自由度有限振幅运动非线性控制方程．其中考虑了由6自由度有限位移引起的多种非线性因素，如各自由度之间的耦合、瞬时湿表面、瞬时位置等；还包括自由表面效应、粘性力等因素引起的非线性 ...
沈晓鹏, 曾晓辉, 吴应湘
core +2 more sources