Results 21 to 30 of about 799 (135)
Dizhen xuebao, 2023 利用2008—2021年区域地震台网及部分流动地震台阵的近震走时观测资料，采用双差层析成像方法获得了龙门山断裂带和安宁河断裂带周边地区的高分辨率地壳三维P波速度结构。结果显示：四川盆地浅部呈明显的低速异常，在前陆盆地低速异常可一直延伸至约15 km深，推测与该地区接收大量来自青藏高原东缘的沉积物有关；在龙门山断裂带附近，中上地壳存在一些与断裂带平行的高速异常体，它们较好地揭示了该地区穹隆体和逆冲推覆体深浅部的分布特征，例如，位于龙门山断裂带中部的彭灌穹隆体下延深度可达15 km左右 ...
Yuchen Xiao, Jianping Wu
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Gaoya dianqi, 2021 针对一起500 kV断路器爆破片破裂事故,通过对破裂爆破片开展理化检验,发现故障爆破片材质为灰铸铁,表面有微孔,双侧用橡胶层密封保护,没有锈蚀,电镜分析表明材料脆性较大。通过更换同型断路器爆破片,比较新旧爆破片的性能,发现旧爆破片均有变形,大部分旧爆破片外侧橡胶层老化龟裂,导致爆破片进水锈蚀。通过开展爆破试验,发现部分旧爆破片爆破压力降低,但并不是锈蚀严重的样品。结果表明锈蚀并不是导致爆破片爆破压力下降的关键原因,该爆破片为平板型,铸铁材质,脆性较大,抗疲劳性能不足 ...
焦宗寒, 郑欣, 马宏明, 宋玉锋
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The inherent brittleness of hardmetals stems from the rigid covalent bond in the ceramic matrix and the sharp ceramic/metal interface, which restricts the nucleation and motion of dislocations. In this study, a novel strategy is proposed to activate significant dislocation behaviors in the WC matrix by employing a non‐equiatomic CoNiFeCr ...
Cheng Qian +9 more
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People and Nature, Volume 8, Issue 2, Page 270-282, February 2026.Abstract Chinese consumer demand for ivory threatens vulnerable African elephant populations, despite long‐standing efforts to combat the illegal wildlife trade. Behavioural science approaches have been proposed to address these systemic behaviours. However, their robust use remains uncommon in demand management interventions.
Molly R. C. Brown +3 more
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Gaoya dianqi, 2021 复合绝缘子断串及芯棒击穿事故会对输电线路的安全稳定运行构成严重的威胁。文中对2016年以来浙江省内发生的复合绝缘子断串及芯棒击穿故障案例进行统计分析,包括故障概况、产品情况、故障形态、性能试验、故障原因以及相关建议措施等。结果表明,2016年以来浙江省内共发生8起复合绝缘子断串及芯棒击穿故障,包括6起酥朽断裂、1起脆性断裂及1起芯棒击穿。其中,脆性断裂主要为端部密封不良,外部潮气进入,并在长期高场强作用下产生的应力腐蚀所致;酥朽断裂主要为芯棒—护套粘接不良,在受潮、放电 ...
周晨 +5 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Nb‐Si‐based superalloys are considered as the most potential candidate materials for nickel‐based superalloys due to the lower density and higher using temperature. Here, a type of stable Nbss/γNb5Si3 bi‐phases structure with a coherent interface has been successfully designed. Additionally, the Nbss and γNb5Si3 phases showcase the orientation
Xiao‐Wei Wang +6 more
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Simulating hydrogen embrittlement fracture based on phase field method
Xibei Gongye Daxue Xuebao, 2022 The phase field hydrogen embrittlement fracture model is improved by introducing tension-compression split of strain energy. The numerical formulas of the model are provided, besides, the coupling term of concentration field and displacement field is ...
CHEN Pengcheng +3 more
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Internal oxidation has been identified as an effective method for enhancing the strength of AgMg alloys. However, the concurrent occurrence of embrittlement remains inadequately understood, thus limiting their broader application. This study investigates the oxidation behavior of AgMg alloys with Mg concentrations ranging from 1 at% to 7 at ...
Hai‐Cheng Zhu +12 more
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World Medical &Health Policy, Volume 17, Issue 4, Page 823-830, December 2025.ABSTRACT Sepsis is a leading cause of mortality in the United States, with over 350,000 deaths annually, yet the contribution of neighborhood‐level social determinants of health (SDoH) remains underexplored. We conducted a retrospective analysis of 4.4 million hospitalized patients with sepsis, identified using ICD‐10 codes, leveraging de‐identified ...
Ahad Khaleghi Ardabili +3 more
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Dianci bileiqi, 2010 介绍了一起复合绝缘子脆断的发生过程,通过解剖和相关电气、机械性能试验,以及脆断面形成机理等方面分析了脆断原因,发现芯棒脆断的原因是运行环境的恶劣加之结构的缺陷使得端部密封不良,造成酸蚀并最终导致芯棒机械性能下降而发生脆断。为防止脆断事故的发生,从加强检验、连接方式、材料工艺、存储安装等方面提出了相应的对策,保证电网的安全可靠运行。
郭清滔, 廖福旺, 黄海鲲
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