Results 51 to 60 of about 183,314 (146)
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT High‐strength aluminum (Al) alloys are usually unprintable by laser powder bed fusion (LPBF) due to the severe hot cracking along the columnar grains. Doping elements scandium (Sc) and/or zirconium (Zr) is an effective way to eliminate hot cracks by refining the grain size to nearly nanoscale levels.
Zehuan Zhang +15 more
wiley +1 more source
Dizhen xuebao, 2020 收集郯庐断裂带中南段59次地震的等震线数据，运用遗传算法，将郯庐断裂带中南段按照断裂带东侧和西侧分区，分别反演其地震烈度衰减参数，反演时使目标函数的一范数最小，同时对烈度衰减曲线的远场施加约束，通过自助抽样（Bootstrap）技术多次重复反演以对反演结果的稳定性进行评价，并将断裂带东侧和西侧的烈度衰减曲线分别与第五代地震动参数区划图进行对比。结果表明：使用本文提出的方法进行反演可使烈度衰减曲线即使不进行近、远场补点，也能收敛；断裂带东侧和西侧的结果均与第五代地震动参数区划图的结果存在差异 ...
Yicheng He +5 more
doaj +1 more source
Governing by Ambiguity: Sociotechnical Imaginaries of Platforms in China
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT Besides clear policy directives, the unresolved and open‐ended elements in policy communication also create discursive politics. This article argues that ambiguity in policy communication reflects the state's exercise of power within a fractured sociocultural landscape.
Fangyu Qing, Ngai Keung Chan
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban为明确白云凹陷古近系断裂体系发育特征，深化“先存构造、拆离薄化、岩浆改造”三元耦合控制下的凹陷结构研究，运用深度域高精度三维地震资料，结合构造样式识别、断裂活动定量表征、平衡剖面演化等方法，在断裂级别划分、优势方位、有序活动、立体演化等方面开展了多维研究。研究表明：（1）白云凹陷发育控盆、控洼、控带与控圈4个级别断裂，存在北东东（NEE）向、近东西（EW）向与北西（NW）向3组优势方位；（2）白云凹陷构造特征西、中、东区差异明显，西区以高角度铲式控洼断裂为主，发育2期4组岩浆底侵；中区以中 ...
范彩伟(FAN Caiwei) +5 more
doaj +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Titanium (Ti)–steel composite joints are prone to the formation of compounds such as TiC, TiFe, and TiFe2 during solid‐phase bonding. This phenomenon leads to premature failure and significantly reduces the bonding quality of the joints. However, the fracture behavior of the joint influenced by these compounds, particularly on the initiation ...
Sheng Zeng +5 more
wiley +1 more source
The Normative Shield: How the BRICS Loose Alliance Promotes Authoritarian Resilience
World Affairs, Volume 189, Issue 3, Fall 2026.ABSTRACT This article investigates whether the BRICS grouping strategically deploys high‐level diplomatic visits to bolster incumbent autocrats facing domestic instability, thereby promoting “authoritarian durability.” Utilizing a novel dataset of official visits by the five core members (Brazil, Russia, India, China, and South Africa) between 1991 and
Bülent Aras, Burcu Fazlıoğlu
wiley +1 more source
Dianci bileiqi, 2020 针对三维裂纹尖端应力强度因子计算困难的现状,提出了一种新型的三维裂纹应力强度因子计算方法,通过与其它方法在计算含圆孔平板裂纹尖端应力强度因子的对比分析,验证了本文应力强度因子计算方法的有效性和优越性。建立含裂纹缺陷的高压断路器瓷套有限元数值模型,将本文方法应用于高压断路器瓷套裂纹的应力强度因子计算,研究了高压断路器瓷套表面裂纹应力强度因子与瓷套所处环境温度、裂纹分布位置和裂纹尺寸的变化关系,获得了易导致瓷套断裂的环境、裂纹分布位置和裂纹尺寸,为电力行业中断路器瓷套的设计及运行维护提供有效的技术指导和借鉴。
赵滨滨, 王莹, 徐晓萌, 崔文婷
doaj
, 1996 采用表面裂纹法，利用自行研制的低温多试样拉伸装置，研究了一种航天铝合金材料的焊缝在低温下(20K)的断裂性能，并对断口进行了电镜显微分析，为提高焊接的质量提供了依据
夏源明 +4 more
core +2 more sources
, 1982 在这篇文章里,我们结合断裂问题回顾连续介质办学的发展,并指出,为了更深地理解和描述断裂现象,还需要进一步完善连续介质力学。 一、经典弹塑性理论应用于断裂时的局限性和Grifith的理论 现讨论一维应变条件下裂纹的扩展问题。我们假设 1.材料是均匀的,就是说,所讨论的材料是没有内部结构的; 2.材料是弹性的 ...
郑哲敏
core +2 more sources