Results 61 to 70 of about 36,171 (145)
Gaoya dianqi, 2010 断路器在随机关合空载变压器时会产生幅值、频率很高的励磁涌流,这种操作暂态可能导致微机继保装置误动作,降低用户电能质量和系统可靠性。根据空载变压器涌流产生的机理,采用选相关合技术消除变压器励磁涌流,研究了铁心剩磁和最佳关合相位关系;分析了断路器截流和暂态恢复电压对铁心剩磁影响,并给出了剩磁测量方法。在空载变压器选相关合原理基础上,采用ATP-EMTP软件建立空载变压器关合模型,对暂态过程进行了仿真。仿真结果表明,选相关合技术能有效消除空载变压器合闸时产生的励磁涌流,为空载变压器选相关合提供了理论基础。
李伟 +4 more
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Whose Digital Future? Civil Society and Alternative Imaginaries in Transnational Digital Governance
Policy &Internet, Volume 18, Issue 3, September 2026.ABSTRACT This article investigates different visions of digital futures, examining how desired futures are discursively constructed within civil society in transnational digital governance. The analysis builds on discourse theory and a growing body of research on imaginaries in digital governance.
Outi Puukko
wiley +1 more source
Poverty &Public Policy, Volume 18, Issue 3, September 2026.ABSTRACT This paper examines the impact of the COVID‐19 pandemic on income and wealth inequality in Switzerland, with a particular focus on poverty dynamics and the role of the social security system. Using newly linked administrative tax data for four large cantons covering over a third of the Swiss population, we track changes in household income and
Oliver Hümbelin +2 more
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四川大学学报. 自然科学版, 2011 本文主要是研究金属铁经历冲击—卸载到熔化压力区,其内部发生熔化相变时,铁/蓝宝石界面的辐亮度和温度随时间演化特性,发现辐亮度随时间持续增强而界面却经历了一个慢降温过程,该特征与无相变或瞬时相变的热传导模型结论不一致,即无熔化相变或瞬时相变时,界面温度是一个稳定值.本文结合熔化相变动力学模型与热传导方程对实验现象给出一种理论解释.模型计算所给出的温度历史与观测结果一致,由此可以校对其它测量或者计算熔化温度的方法和模型计算的结果,并能够初步限定出该压力下铁的熔化成核速率和径向长大速率.
张世来 +5 more
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT Pyritum can eliminate blood stasis and promote the healing of muscles and bones, which has been used as a traditional mineral medicine in China for thousands of years. However, the mechanisms of action and processing methods of Pyritum were not illustrated.
Mingxia Li +8 more
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Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT In MAX‐phase‐derived metal–matrix composites, the M‐site element simultaneously governs carbide chemistry and matrix precipitate stability, yet it has traditionally been selected empirically rather than from a predictive criterion linking M‐site choice to carbide chemistry, matrix alloying, and L12 stability; moreover, the reaction pathway ...
Wei Yang +8 more
wiley +1 more source
Unveiling Entropy‐Driven Hard‐Tough Synergy Mechanisms in High‐Entropy Carbonitride Ceramics
Rare Metals, Volume 45, Issue 9, September 2026.ABSTRACT High‐entropy ceramics manifested promise for extreme environments, yet their phase stability and mechanical synergy mechanisms remain elusive. Herein, entropy‐difference carbonitrides, including (TaTiV)CN, (TaTiVNb)CN, and (TaTiVNbHf)CN, were designed and consolidated via spark plasma sintering.
Long Zhao +6 more
wiley +1 more source
Shiyou jixie, 2015 采用有限元仿真方法，根据结构失稳理论分析六级分支井分岔装置在20 MPa内压作用下相贯线部分出现鼓包变形问题。首先，模拟双相钢和IF钢不同壁厚、管径的六级分支井分岔装置在内压作用下的变形及应力分布，并测量分岔装置最大鼓包变形量与位置。然后，通过未加压分岔装置相贯线截面与加压变形后相同位置截面对比分析，发现相贯线截面存在的结构几何缺陷与厚度缺陷导致分岔装置变形，得出六级分支井分岔装置结构失稳极值点位置和导致最大鼓包变形的最大几何缺陷；在内压作用下 ...
邓治国 +7 more
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World Medical &Health Policy, Volume 18, Issue 3, September 2026.ABSTRACT The integration of artificial intelligence (AI) in healthcare is rapidly evolving, offering immense potential to transform service delivery, diagnostics, and health systems governance. However, Sub‐Saharan Africa faces significant readiness challenges due to limited infrastructure, capacity gaps, and fragmented digital strategies.
Said Baadel +3 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2017 恶性肿瘤是一种体细胞遗传病,为相关基因结构与功能发生改变的结果,本文就大肠癌与之相关的基因突变及遗传易感性进行综述。1肿瘤的发生与基因突变的关系恶性肿瘤的发生及发展与相关的基因结构及其相关的功能发生改变有关。这些基因参与调控细胞的的正常生长周期、细胞的死亡及DNA的损伤修复。基因的种系突变（germ line mutation）在遗传性恶性肿瘤中起主要作用[1]。突变是生物进化的必要条件之一,没有突变就没有进化 ...
侯睿智, 舒振波, 侯睿达, 刘艳
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