Results 31 to 40 of about 23,507 (165)
Nonlinear finite element analysis for seismic performance of high-strength concrete beam-column joints with new reinforcement details [PDF]
, 2006 Because the factors that affect the behavior of the beam-column joints are complicated, an experimental study alone is not sufficient. Therefore, a nonlinear finite element analysis was conducted to provide better understanding of the performance of the ...
Gan, L, Li, J, Pam, HJ
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Basic income trials and the politics of scale: A research agenda
Policy Studies Journal, EarlyView.Abstract The growing popularity of basic income has led to extensive trials of the policy in numerous settings across the world. However, analysis of the politics of basic income, and in particular the political dynamics preceding and resulting from trial programs, lags. In response, we propose a research agenda that uses political scale to investigate
Jurgen De Wispelaere +2 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2020 基于有限元软件ABAQUS进行数值模拟,研究圆端形钢管混凝土构件的偏拉力学性能,有限元模拟结果和试验结果吻合较好。基于有限元模型开展机理分析和参数分析,机理分析表明:在偏拉状态下,圆端形钢管混凝土构件呈现出较高的承载能力;圆弧段钢管可有效约束核心混凝土,由于核心混凝土的支撑作用使钢管的抗拉承载力得到显著提高。参数分析表明:钢管强度、含钢率、混凝土强度和截面高宽比等参数对圆端形钢管混凝土构件的拉-弯相关曲线形状没有显著影响。基于参数分析建议了圆端形钢管混凝土构件偏拉承载力的计算公式 ...
郝怀霖, 王志滨, 吴泓均
doaj
Development on Grinding Software of Solid Carbide End-Mill used for Aviation Aluminum Alloy Processing [PDF]
, 2015 刀具在机械制造业中占有相当重要的地位，伴随着国内航空航天领域的快速发展，特别是随着我国大型客机、军用飞机等国家重点项目的启动，航空铝合金加工专用刀具的需求量急剧增加。虽然国内刀具厂商和学者开展了大量研究工作，但是制造出的高性能刀具依然不能够满足航空高端制造的需求，国内高档航空铝合金刀具市场基本上被国外刀具企业垄断，严重制约着我国航空航天工业的进步和发展。 在此背景下，论文围绕着“面向航空铝合金加工用整体硬质合金铣刀磨制软件开发”课题开展了研究，基于刀具复杂曲面建模及成形理论 ...
陈站
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Scientists in power plays: How substantive were scientists' narratives during the COVID‐19 pandemic?
Policy Studies Journal, EarlyView.Abstract Scientists who provide expert advice must engage with policy processes. Little is known about whether and how scientists deal with the political dynamics of policy processes that are inherent to policymaking. We study this question by building on the policy dimension concept within the Narrative Policy Framework.
Jule Ksinsik, Caroline Schlaufer
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2013 研究分析了欧洲第三代核电站（EPR,European Pressurized-water Reactor）核岛安全壳钢衬里的模块化吊装。首先研究了环形桁架在进行钢衬里吊装时最不利竖向荷载下的受力性能;其次对钢衬里吊装环形桁架进行了参数优化分析,研究环形桁架的不同参数变化对桁架性能的影响,确定出环形桁架的优化参数取值;最后对某核岛安全壳钢衬里穹顶吊装时的各项受力性能进行了研究,包括吊装受力分析、风荷载作用分析及吊耳节点有限元分析,并提出了一些参数的取值及吊装方案的合理建议,为工程施工设计提供了参考。
叶垚 +4 more
doaj
Design of a DC-DC Synchronous Buck LED driver [PDF]
, 2016 驱动电源电路是大功率LED光源设计的关键技术，由于发展时间较短，目前大功率LED驱动电源依旧处于发展和完善阶段，驱动电源技术成为目前大功率LED的短板。本文针对路灯、舞台灯、车灯等大功率LED照明应用中驱动电源转化效率低、恒流精度不高、调光精度差等问题，设计了一款高效率、高恒流精度、PWM信号精确调光的同步降压型LED驱动芯片。 本文针对大功率LED的电气特性以及驱动电源的相关技术要求，提出了滞环电流控制、无需谐波补偿的同步Buck开关电源结构，提高了芯片的转化效率 ...
胡晔
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Policy 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
Parameters setup of AC CMOS gates(交流CMOS门电路参数的设定)
Zhejiang Daxue xuebao. Lixue ban, 2002 CMOS门电路的参数是对它本身物理特性的一种定量描述,对参数的设定是实际应用CMOS门电路的基础. 本文从理想参数出发归纳了直流CMOS门电路主要参数的设定思想并对各项参数进行了分析讨论.然后介绍了交流CMOS门电路的设计思想及结构与工作原理上的特点.在分析二类CMOS电路差异的基础上,本文采用类比的方法对交流CMOS电路的设定进行了研究.
LIUXiao(刘晓), WUXun-wei(吴训威)
doaj +1 more source
Design and Implementation of Automatic Monitoring and Early Warning Analysis System for an Oilfield [PDF]
, 2015 生产自动化技术发展日新月异，特别是近十年，大型石油企业持续不断地提升生产自动化技术水平，加大生产自动化应用深度，实现石油生产“过程可视化”的同时，消除数据孤岛，实现信息共享，提高信息利用率，提高企业决策水平和实效性，实现管控一体化，已成为石油企业发展综合自动化系统的发展方向。 随着油田现场计算机网络、生产自动化建设不断深入，生产自动化技术和网络技术在油田生产现场各个原油处理站库的应用，促进了油田生产的发展。但随着生产流程的不断改造完善，生产管理人员在使用系统的过程中也不断产生新的应用需求 ...
叶康林
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