Results 11 to 20 of about 2,090,567 (184)
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Bone restoration is often hindered by the spatiotemporal dysregulation of immune and regenerative signals. Conventional bio‐inert implants, providing only passive support, fail to modulate this microenvironment, leading to infections and poor healing.
Zhizhong Sun +8 more
wiley +1 more source
建筑工程与管理为揭示既有沥青路面在移动荷载下的动力响应与破坏机理，此文采用数值模拟方法，系统研究了轴载速度和大小对含有两条横向基层反射裂缝路面结构的影响。结果表明，路面动力响应存在显著的临界车速效应，在车速达到108km/h时，路面结构的宏观应力因共振作用达到峰值，表明此速度下的损伤最为严重；贯穿裂缝是应力响应的主要控制点，而位移响应的控制点随着车速变化在两条裂缝之间动态“漂移”；贯穿裂缝处的剪应力和II型应力强度因子远高于拉应力和I型应力强度因子，表明其破坏主要由剪切作用主导；轴载大小与所有响应指标呈线性关系 ...
桥峰 陈, 泽中 吉
semanticscholar +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Dielectric polymers commonly suffer from severe performance degradation above 150°C, hindering advanced power systems. Herein, we demonstrate a polyetherimide (PEI) nanocomposite that overcomes this by mimicking the gradient architecture of nacre and bamboo, incorporating a continuous vertical gradient of fluorinated boron nitride nanosheets ...
Jian Wang +8 more
wiley +1 more source
APPLICATION OF SUPER-MICRO TESTER IN MEMS BONDING STRENGTH TEST
, 2005 研制微力学测试仪,对微电子机械系统中键合结构的强度进行测试.最大载荷为1.4 N,在载荷量程为450 mN时仪器的最高分辨力为10 μN.采用键合在玻璃基底上的硅悬臂梁作为试样.为模拟横力剪切破坏和扭转破坏工况,用微力学测试仪分别在悬臂梁的固定端和自由端施加载荷至试样破坏.测得相应的破坏载荷并计算出最大剪应力.对破坏残骸的显微观察发现,存在玻璃开裂和硅开裂2种失效模式.该技术为微电子机械系统(micro-electro-mechanical system,MEMS)键合结构的强度表征提供一种有效方法 ...
郇勇 +4 more
core +1 more source
Shiyou jixie, 2015 针对裂纹对厚壁筒自增强处理效果影响的问题，采用有限元软件分析了2种径比不同裂纹的厚壁筒自增强处理后的残余应力分布规律，并通过节点位移外推法计算了裂纹尖端处的应力强度因子。研究结果表明，不同径比时自增强压力的变化决定了含裂纹厚壁筒在裂纹尖端残余压应力的分布，以及裂纹尖端应力强度因子的变化率；尖端前缘自由表面存在残余压应力区域，促进了裂纹的闭合；随着自增强压力的增大及裂纹长度的减小，扩大了裂纹尖端沿裂纹扩展方向的残余压应力区域范围。
李宁, 廖建敏, 周思柱, 韩冬
doaj
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Aqueous zinc‐ion batteries (AZIBs) have attracted increasing attention in energy storage owing to their high energy density, low redox potential, and cost‐effectiveness. Nevertheless, uncontrolled dendrite accumulation, gas generation, and severe side‐reaction problems hinder the cycling lifespan, which prevents their commercial applications ...
Xiangzhong Kong +8 more
wiley +1 more source
体能科学本研究通过整合神经影像学、认知心理学以及运动干预的实证数据，系统揭示了户外运动对ADHD儿童执行功能的多维度作用路径。研究表明，户外运动可通过以下机制改善执行功能：其一，在生理层面，中高强度有氧运动（如徒步、攀岩、定向）能够显著促进脑源性神经营养因子（BDNF）的分泌，从而增强前额叶皮层与基底神经节之间的神经连接，进而提升抑制控制、工作记忆及认知灵活性；其二，在行为层面，开放技能类活动（如徒步、登山）需要个体进行动态决策和环境适应，这种反复练习的过程有助于强化中央执行功能；其三，在自然环境层面 ...
雪萍 李, 博华 张
semanticscholar +1 more source
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT The development of structurally stable anodes with high capacities and long cycle lives is essential for the development of potassium–ion batteries. Conversion‐type anodes have attracted considerable attention in potassium–ion batteries (PIBs) due to their high theoretical capacities.
Jeong Ho Na +7 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2005 首先根据无限大中心裂纹板在I型荷载作用下应力分布的近场奇异解,构建薄壁杆件在均匀拉伸时沿裂纹所在截面的正应力的分布模型;然后利用平衡条件确定无量纲应力强度因子;从而建立了一种求解含中心裂纹薄壁杆件应力强度因子的面场分析近似方法。与现有的数值结果比较表明,该方法不仅简单实用,而且结果可靠。文中给出的几种常见薄壁杆件含I型中心裂纹时的无量纲应力强度因子的近似简单解析表达式,既适用于焊接组合薄壁杆件,也适用于冷弯薄壁杆件。
周利
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Early diagnosis of liver cancer demands high sensitivity, high specificity, convenience and real‐time monitoring capabilities. However, it encounters challenges such as low concentration of markers, numerous interfering factors, and limitations of detection technologies.
Changsheng Shi +10 more
wiley +1 more source