Results 51 to 60 of about 1,429,873 (176)
Legislating Uncertainty: Election Policies and the Amplification of Misinformation
Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT Can state election policies affect the spread of misinformation? This paper studies the role played by ballot processing policies, which determine when ballots can be examined and organized, in the online spread of political misinformation. We present evidence from the 2020 U.S.
Morgan Wack +5 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 在圆钢管单层网壳结构中,圆钢管构件在壳体曲面内、外的计算长度不同,造成材料性能无法在两个方向上均得到充分利用。提出以H形钢为杆件形式的单层网壳结构克服了上述不足。首先通过一则算例对比分析了圆钢管和H形钢两种杆件形式在单层网壳曲面内、外的轴心受压稳定性差异,随后为进一步减小单层网壳中杆件弯矩对构件受力的影响,运用力密度法对H形钢单层网壳进行形态优化,并对比了找形前、后单层网壳的静力性能。研究结果表明,H形钢轴心受压稳定应力在壳体曲面内、外可以达到平衡且在曲面外低于同截面面积圆钢管的稳定应力 ...
闫翔宇, 巩昊, 陈志华, 张玉轩
doaj
Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT What are the conditions under which business corporations expand their institutional power? This paper argues that institutional power is affected by the architecture of the “acquisition regime”—the set of formal (and informal) rules that govern how states purchase public services.
Reut Marciano, Shir Gal
wiley +1 more source
, 2017 本发明涉及高低温力学性能测试系统，具体的说是一种在高低温及太空失重环境下，测试大型桁架伸展机构展开性能的伸展机构高低温力学性能测试装置，包括桁架收藏单元、力加载单元、力加载随动单元、力加载传输架体和重力平衡小车，其中力加载单元可移动地安装在所述力加载传输架体上，力加载单元通过力加载随动单元驱动移动，桁架设置于桁架收藏单元上，桁架的自由端与力加载单元相连，所述桁架伸出桁架收藏单元的部分通过重力平衡小车托举支承，力加载单元和重力平衡小车随桁架展开移动，在力加载单元上设有压力传感器 ...
徐志刚 +5 more
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, 2006 对于宏观材料的力学性能的研究通常基于传统的连续介质力学;然而,当研究对象小到微/纳米尺度时,材料缺陷等因素对微观材料力学性能影响程度将不同于宏观材料。此时,材料将表现出明显的尺度效应等力学性能。用传统连续介质理论将不能解释此现象。因此,许多学者基于正问题思想对微观材料的力学性能进行研究:Fleck-Hutchinson提出了机遇传统弹塑性理论的塑性应变梯度理论;Nix-Gao提出了基于位错理论的塑性应变梯度理论;Gerberich等提出了基于比表面能的微尺度材料尺度效应理论[3 ...
舒思齐, 魏悦广
core +1 more source
Policy Studies Journal, Volume 54, Issue 3, August 2026.ABSTRACT As the Narrative Policy Framework (NPF) begins to unpack issues of power and narratives, the main focus has been on power‐over and domination rather than more transformative notions of power‐to and empowerment. This article draws on insights from gender and policy studies and suggests that the NPF benefits from adopting a multifaceted notion ...
Hilda Broqvist
wiley +1 more source
, 2003 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
Microstructure Engineering Toward High Cost‐Effective Nd–Fe–B Sintered Magnets: A Review
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Nd–Fe–B sintered magnets, critical for enhancing electromechanical conversion efficiency and operational stability in wind turbines and electric vehicle drives, are prized for their outstanding coercivity, high remanence, and superior maximum energy product.
Dongmin Zhang +5 more
wiley +1 more source
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Tumor metastasis and recurrence are major reasons for the difficulty in curing cancer. Although some immunotherapy methods have been developed, they are still limited by immunosuppression, resulting in limited therapeutic efficacy against tumors.
Chen Ye +4 more
wiley +1 more source
Shiyou jixie, 2014 弹性爪机构是海上完井滑套开关工具中最重要的部件，其力学性能稳定性对于作业成败至关重要。基于受力分析和有限元模拟，建立开关工具弹性爪力学理论模型和三维有限元分析模型，研究弹性爪结构应力分布与作业性能。基于受力理论分析可知，弹性爪机构最大轴向拉力为4 116 N，最大应力为675 MPa；基于有限元模拟计算，弹性爪机构最大轴向拉力为3 924 N，最大应力747 MPa，弹性爪结构强度满足要求。功能试验结果表明，理论计算方法存在一定的误差，有限元模拟结果相对比较精确和可靠 ...
刘传刚 +4 more
doaj