Results 31 to 40 of about 23,201 (124)
Gaoya dianqi, 2010 基于后退欧拉法和变分原理推导了非线性的时域有限元电场计算方程。利用时域有限元方法分析了含不同应力控制管时的电缆终端电场分布。分析结果表明,采用由电容性和非线性电阻性材料复合绝缘结构的应力控制管时,电缆终端的电场分布最为均匀。
宫瑞磊 +4 more
doaj
He jishu水锤效应一直是核电厂热工安全所关注的重要问题之一。准确获得水锤效应下压力波的传播数据对结构载荷分析和评价至关重要。目前，常见水锤分析程序多采用的是特征线法（Method Of Characteristics，MOC），但其在处理多管道复杂系统和捕捉不连续性方面存在一定的计算误差。而有限体积法（Finite Volume Method，FVM）在计算复杂系统水锤问题上存在优势，典型程序为RELAP5。对此，本文基于FVM初步开发了一款水锤压力波传播分析程序。针对具体的单相水锤问题，发展了一种“汽-液 ...
余 光辉 +4 more
doaj +1 more source
Issue Attention in Public Opinion Polls: Pollsters as Agenda Responders and Agenda Setters
Policy Studies Journal, EarlyView.ABSTRACT Polling organizations, like other policy actors, must prioritize certain issues. We argue that, for normative and financial reasons, pollsters prioritize issues that are viewed as important by other institutions and the public, leading them to focus survey questions on issues that are on congressional and media agendas, and which are public ...
Qian Zhang +2 more
wiley +1 more source
Politics &Policy, Volume 54, Issue 2, April 2026.ABSTRACT The Great Depression was a turning point in the development of social programming in North America. This paper explores the politics of social policy expansion during the Great Depression in the United States and Canada through an analytical lens that combines the insights of historical institutionalism and the analysis of transnational ...
Daniel Béland +2 more
wiley +1 more source
Study on aseismic and shock absorption of folded plate latticed shell(折板式网壳结构的抗震及减震研究)
Zhejiang Daxue xuebao. Lixue ban, 2002 采用振型分解反应谱法对折板式网壳结构的动内力作了分析,计算了结构厚度、坡度等参数对动内力的影响,另外对用振型分解反应谱法和时程分析法计算的结构动内力作了比较.最后,探讨了采用粘弹性支座对四肢腿折板式网壳结构的减震效果.
GAOBo-qing(高博青) +1 more
doaj +1 more source
How New Issues Become Polarized: Partisan Triggers and Subsystem Shopping in Early AI Policymaking
Policy &Internet, Volume 18, Issue 1, March 2026.ABSTRACT Early AI policymaking in the United States appeared bipartisan, but subsequent developments raise the question of whether AI policy will become more polarized over time. To examine how partisanship takes root around novel policy issues, we perform a mixed‐methods study, analyzing survey data from 129 state legislators in 44 states and ...
Robin Jacobson +2 more
wiley +1 more source
Gaoya dianqi, 2018 为了研究熔断器撞击器撞击负荷开关、触发其脱扣分闸的机械性能,文中设计了一套摆锤式冲击能量测试分析系统。基于质点系的动量矩定理,提出了一种利用动量矩分析其冲击特性的新方法:在熔断器撞击器燃弧释放的瞬间,以高采样频率获取瞬时冲击力—时间响应数据,截取有效数据段进行数值积分运算,由此获得撞击瞬间释放能量的时间、行程和冲击能量。通过与传统实验方法计算数据的对比,发现撞击过程中测试系统的能量损失对文中所用测试分析方法的影响较小,极大地提高了熔断器撞击器撞击过程定量分析的精确性。该实验和分析方法简单快捷 ...
王金元 +4 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The development of high‐efficiency, stable, and scalable perovskite solar cells/perovskite solar modules (PSCs/PSMs) highly depends on the performance and cost‐effectiveness of functional layers such as electron transport layers (ETLs) and hole transport layers (HTLs).
Baochang Wang +11 more
wiley +1 more source