Results 71 to 80 of about 1,799,214 (159)
ABSTRACT This critical ethnographic study examined the perspectives of service providers and organizational leaders working within charitable food services for people experiencing homelessness in two Canadian cities. Informed by Paulo Freire's writings and a human rights‐based approach, we explored how power is enacted through everyday practices and ...
Corinna Easton +4 more
wiley +1 more source
在造波水槽进行了100kW波力电站气室模型性能试验。测定了设计波周期下,不同入射波高时的ΔPav-Qav、ηA-Qav、NA-Qav以及不同喷咀比时的ΔPav-Qav曲线。还测定了两种喷咀比下,不同入射波高时,波力电站气室性能随波周期变化曲线。数据表明,该气室的设计和建造虽受到站址地形条件和施工条件的诸多制约 ...
孙培亚, 梁贤光
core
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
ABSTRACT Biochemical oxygen demand (BOD) remains a core indicator of organic pollution in freshwater monitoring, but its role in water policy and practice is changing as water‐quality assessment moves toward predictive, integrative, and decision‐support approaches.
Isadora Favero Roque Cenci +5 more
wiley +1 more source
为研究低屈服点钢材LY100在反复拉力作用下的力学性能,设计LY100钢与Q345钢或Q235钢焊接连接的材性试件,共进行4组18个材性试件的单调和反复受拉加载试验研究。获得6种不同加载制度下试件的荷载-位移曲线、应力-应变曲线、滞回性能、超低周疲劳破坏机理以及延性特征等。研究结果表明,焊接接头对试件的超低周疲劳性能有不利影响,焊接接头使LY100钢材力学性能的稳定性和延性变差;LY100钢与Q345钢或Q235钢焊接后,材性试件的强度提高但延性下降;反复拉力作用下,带有焊接接头的材性试件呈现强度硬化 ...
南子森, 李海锋, 罗俊, 孙伟
doaj
通过对3个12.9级高强度螺栓连接端板节点和1个10.9级高强度螺栓连接端板节点的拟静力试验,对节点的破坏模式、滞回性能、承载能力和耗能能力等滞回性能进行了对比分析。结果表明:12.9级高强度螺栓连接端板节点试件破坏时倾向于螺纹处发生脆性断裂,无明显塑性变形,而10.9级高强度螺栓连接端板节点试件在破坏时表现为受拉区螺栓脱扣;12.9级螺栓可以有效地延缓端板节点刚度的退化,同时提高节点的承载能力;使用12.9级高强度螺栓替代10.9级高强度螺栓能够提高节点的耗能能力 ...
杨俊芬 +5 more
doaj
ABSTRACT Research on English‐Medium‐Instruction (EMI) highlights inadequate support for students transitioning from L1‐medium‐instruction to EMI. To date, little research has focused on how L2 students’ adaptation to an EMI environment influences their L2 learning motivation (LLM).
Kevin W. H. Tai
wiley +1 more source
为了研究新型冷弯薄壁型钢板剪力墙的抗侧性能,以C形+U形龙骨抱合的形式作为剪力墙试件的边柱截面形式,并在边柱之间设置薄钢板,共设计了两种不同宽度的剪力墙试件,对两种剪力墙试件均进行了单调加载和低周往复加载试验。通过试验得到了新型冷弯薄壁型钢板剪力墙在各阶段的荷载及位移特征值、荷载-位移曲线、骨架曲线及破坏形态,并对结构的破坏特征、耗能能力、刚度及承载力退化进行了分析。试验结果表明:新型冷弯薄壁型钢板剪力墙通过边柱之间的薄钢板受力形成钢拉力带与边柱一起共同承受水平荷载,表现出良好的抗侧性能 ...
石宇 +5 more
doaj
Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
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
为了填补螺栓球柱节点在高温受压承载性能研究方面的空缺,借助有限元分析软件ABAQUS开展研究。首先,在校核模型可靠性的基础上,进一步提出了更符合实际情况的节点模型;其次,通过147个模型算例探究节点的破坏机理和各关键参数对节点受压承载性能的影响;最后,推导出节点的高温受压承载力公式。研究结果表明:提出的节点模型不仅更符合实际情况,而且对螺栓球柱节点受压性能的评估也更加保守和安全;当温度在300 ℃以内时,节点的初始刚度和承载力变化不明显,当温度大于300 ℃时,节点的初始刚度和承载力出现显著下降 ...
陈安阳 +7 more
doaj

