Results 101 to 110 of about 31,003 (237)
Public perception of Ghana's Free Senior High School policy: A north–south comparative analysis
Review of Policy Research, EarlyView.Abstract Ghana's Free Senior High School (SHS) policy, implemented in 2017, aims to increase access to secondary education, promote equity, enhance educational outcomes, and foster human capital development. This study examines public perception of the Free SHS policy, focusing on the variations between the northern and southern regions of Ghana and ...
Michael K. Dzordzormenyoh +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 为研究具有不同连接形式、隔板厚度和外伸长度的隔板贯通节点的力学性能,使用ABAQUS对不同构造节点进行数值模拟研究。基于试验结果验证了建模方法的准确性,并分别建立了全焊接、腹板栓接-翼缘焊接、下栓上焊、全螺栓四种连接形式的隔板贯通节点模型,对比了不同连接形式节点的力学性能,对产生差异的原因进行了机理分析。并进一步针对下栓上焊连接形式节点的隔板厚度、外伸长度对力学性能的影响进行了参数化分析。研究发现,具有翼缘螺栓连接形式的节点承载力更高且塑性铰远离节点核心区,基于此且考虑到施工因素 ...
陈志华, 于越, 周婷, 李玉熙
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Mechanical Performance Analysis of Perstressed Continuous Beam Bridge Under Fire [PDF]
, 2017 随着经济的发展，我国桥梁等基础设施得到了飞速发展，但随之而来的就是各种安全隐患，火灾就是其中一种安全隐患。一旦发生火灾，轻则中断交通、损害生命和财产利益，重则导致桥梁直接崩塌，难以修复。但我国对于桥梁受火的研究却还是刚刚起步，研究水平远远落后于实际工程需求。因此加快桥梁受火的研究显得十分必要。 本文以厦门市大嶝桥为研究对象，主要的研究内容如下： ①根据现有的研究成果，归纳火灾高温状况下，混凝土、预应力钢筋力学性能参数以及热工性能参数，揭示出混凝土热传导系数、弹性模量、热膨胀系数、预应力钢筋屈服强度 ...
邵文军
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Innovating Public Food Procurement: A Case Study of Dordogne's Path to Sustainability
Review of Policy Research, EarlyView.ABSTRACT This study examines how an innovative mix of policy instruments can drive sustainable public food procurement (SPFP) in public institutions. Using the Dordogne Department in France as a case study, it explores the role of governance, capacity‐building, stakeholder collaboration, digitalization, and cost management in transforming school food ...
Paola Vola +5 more
wiley +1 more source
Preparation and Electromagnetic Wave Absorbing Property of SiC Fiber /Epoxy Resin Composites [PDF]
, 2015 本论文对碳化硅（SiC）纤维进行热处理，制备了不同电阻率的SiC纤维；利用不同电阻率的SiC纤维与环氧树脂复合，制备单层、两层和三层复合材料，测试其在X波段下的电磁参数及吸波性能；利用传输线理论，计算预测了纤维电阻率、纤维体积分数、材料厚度和叠层方式对复合材料吸波性能的影响规律，并将实验结果与理论计算结果进行了对比验证。 研究发现，在1000-1500C温度区间，随着热处理温度的升高，SiC纤维的电阻率大幅度降低。当热处理温度达到1500C时，纤维电阻率约为1ohm.cm。随着纤维电阻率的降低 ...
李华展
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Review of Policy Research, EarlyView.ABSTRACT This study examines the paradoxical relationship between policy learning and capacity: governments need certain capacities to learn effectively, yet these same capacities often emerge from previous learning experiences. Through a comparative analysis of Hong Kong and Singapore's responses to SARS and COVID‐19, we demonstrate how policy ...
Shubham Sharma, Xun Wu, Gleb Papyshev
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2014 为提高中小跨度网格结构的装配化水平,提出了一种工厂预制、施工方便、可反复拆卸、承载能力可靠的新型套筒丝扣节点。利用对接套筒节点单元分析了节点受力特性以验证其可行性。根据对接套筒丝扣节点的对称性,通过ANSYS建立1/8三维对称实体有限元模型,分析了钢管壁厚、套筒壁厚、丝扣螺距及数量等参数间的定量关系以及对节点轴向拉、压力学性能的影响。在此基础上,最终确定了套筒丝扣节点构造及几何参数。为验证数值模拟方法的合理性,利用试验测试了轴向拉力、压力作用下节点的力学性能,结果表明理论分析数据与试验结果吻合较好。
李思遥 +4 more
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