Results 51 to 60 of about 21,035 (138)
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
Gaoya dianqi, 2010 为了能在放电故障发展的初始阶段发现并监测其发展过程,及时分析判断其故障状态和严重程度,从而提高运行的可靠性,笔者针对几种常用局部放电监测方法的不足,通过油中溶解气体分析及相关电气试验,准确判断了某大变压器的内部放电性质、严重程度及可能发生的大致部位。利用脉冲电流法和超声波检测法的综合运用,成功地检测了该变压器的内部放电故障、发展趋势,并精确地进行了故障定位,在进人检查时上述方法判断和分析的结论得到了验证。
徐澄, 肖荣
doaj
Dizhen xuebao利用机器学习中的主成分分析法（PCA）提取了2022年泸定MS6.8地震的M5.0余震（2022年10月22日）的特征主成分时程，对泸定MS6.8主震的地震动时程进行模拟。在此过程中，将主震目标台站的地震动峰值加速度和反应谱作为约束条件，利用粒子群优化（PSO）算法计算特征主成分时程的组合系数。结果显示模拟结果与真实记录较为一致。这表明：利用机器学习算法能够通过提取余震的特征主成分时程对目标地震进行模拟；在进行小区域地震动模拟时 ...
Kai Chen, Hua Pan
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
大跨空间结构的振动控制问题一直是人们关注的焦点,其抗震性能的好坏直接关系到人民生命和国家经济财产安全。采用粘弹性阻尼器对大跨空间桁架结构进行减震控制,计算阻尼器相应的力学参数,并对加与未加粘弹性阻尼器结构的地震响应进行对比。分析计算表明:无论在Taft地震波还是在El Centro地震波下,在大跨空间桁架结构中加入粘弹性阻尼器均能有效减小结构的位移、加速度和内力,所加设的粘弹性阻尼器能显著吸收地震输入能量 ...
张鹏程, 徐赵东, 黄兴淮
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Accelerating Just Energy Transitions in Brazil: Pathways for Social Development
Latin American Policy, Volume 17, Issue 1, March 2026.ABSTRACT This critical article analyzes energy poverty in Brazil from the theoretical perspective of distributive justice, proposing the implementation of a new social regulation called Contribution to Social Development. The goal is to support the process of a just energy transition leading to a broader debate on energy planning and social issues ...
Marcio Giannini Pereira +5 more
wiley +1 more source
Gaoya dianqi为解决某GIS母线中波纹管的最大压缩位移和疲劳寿命究竟能否同时满足工程指标的难题，应用工程计算和有限元分析分别加以计算，然后通过两种计算结果和实验验证进行比较，以期获得哪种方法更精确可靠。为达此目的，文中给出了工程计算和有限元建模的详细过程。按工程计算方法得到的最大压缩位移结果无法满足工程指标，而有限元分析计算方法，却可以达到工程指标，且有较大的安全裕度。有限元分析还揭示了满足大压缩位移的机理，计算结果符合某GIS工程同时需要的压缩位移和疲劳寿命。经型式试验也验证了模拟的正确性 ...
王玉, 杨知我
doaj
NEPA “Modernization”: From the Trump Administration to the Biden Administration
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT Researchers have recently examined changes to American environmental policy under the Trump administration's first term, and to a lesser extent, under the Biden administration. Scholars have largely not considered changes to the National Environmental Policy Act (NEPA), one of the earliest environmental laws in the United States, and a law ...
Michelle L. Edwards
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2006 【目的】了解基因 Aurora- A 在喉癌中的表达情况及了解其作为预测喉癌预后的新指标的可能性。【方法】用免疫组化的方法检测我科 1995- 1999 年 77 例喉癌标本中 Aurora- A 的表达, 随访 3～136 月, 中位随访时间为 71.93 月, 用统计软件 SPSS11.0 分析 Aurora- A 的表达与喉癌患者年龄、性别、临床分期、临床分型、肿瘤分化程度等的关系及其与预后的关系。【结果】Aurora- A 在喉癌标本中的表达率为 71.4% (55/77 ...
陈福进 +3 more
doaj
, 2011 大跨度空间钢结构作为重要的公共设施,其安全性问题直接关系着国计民生,随着大跨度空间钢结构理论与实践经验的逐渐成熟和完善,其跨度也在逐渐增大。地震载荷作用下,在空间结构设计中考虑地震动的多维多点输入变得十分必要。本文对大跨度空间钢结构多维多点输入抗震的研究现状进行了系统的综述和总结,阐述并评价了现行大跨度空间钢结构考虑多维多点输入的3种抗震计算方法,即时程分析法、随机振动分析法和反应谱法。最后 ...
冯娇, 李会军, 林桂枫, 柳春光
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