Results 11 to 20 of about 16,679 (163)
Zhongshan Daxue xuebao. Yixue kexue ban, 1990 本文用牙体光弹性实验研究证实了牙颈部应力集中的客观存在,作者认为:牙颈部长期的应力集中,可能出现疲劳裂纹,如若伴随化学腐蚀的作用(如酸类),则可能加速疲劳裂纹的形成与发展,最终形成楔状缺损。
doaj +2 more sources
Parameterized Analysis of Craniocerebral Injury Caused by Fist [PDF]
, 2021 Objective Based on the theory of biomechanics, the finite element method was used to study the injury characteristics of different parts of brain hit by fist with different force and to predict the risk of craniocerebral injury, in order to provide ...
GAO Yong, LI Zheng-dong, ZOU Dong-hua, et al.
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Simulation on mechanical and failure characteristics of sandstone with elliptical hole under tension-shear effect [PDF]
, 2023 Under the influence of geological environment and engineering disturbance, elliptical hole-defects exist widely in engineering rock mass. Excavation unloading causes rebound tensile stress in rock mass.
Haiyang WANG +4 more
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基于ABAQUS的谐波减速器装配及运转过程中柔轮的力学响应分析 [PDF]
, 2017 该文设计了一种谐波减速器,基于ABAQUS建立了谐波齿轮减速器的三维有限元模型,采用接触非线性分析，分别进行了装配和动态运转过程的仿真，以获得谐波齿轮减速器关键柔性件柔轮的应力应变响应。计算结果说明：由于轴承滚珠的作用，在柔轮长轴处的齿圈中与分布滚珠相对应的位置,因变形不均匀而产生较大的应力集中;装配后柔轮最大应力位于齿根处，在动态运转状态下最大应力位于齿宽中间位置的齿顶啮入接触处。该结果对谐波齿轮减速器的结构设计改进提供了一个重要的参考。本研究受国家自然科学基金(项目编号:No.51475396 ...
冮铁强, 杨健, 田洪宇, 陈立杰
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Danger-relief principle and parameter optimization of borehole energy relief for rock burst in coal road floor [PDF]
, 2023 The mine area located in northwest of China is seriously affected by horizontal tectonic stress. The borehole is widely used to control coal burst and is an effective, convenient and safe measure.
Tao CHEN
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Key technology and application of pre-stressed anchor to improve pre-tightening force [PDF]
, 2022 As one of the key parameters of bolt support, pre-tightening force plays a decisive role in active support. Domestic and foreign research shows that increasing the pre-tightening force of bolt can reduce the occurrence of roof fall accidents, so as to ...
Chenghang DU +5 more
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Fabrication of Mechanically Controllable Break Junction Microchip and Simulation by Material Mechanics [PDF]
, 2015 当“自下而上”途径组装器件的理念被提出后，美国科学家费曼继而提出小尺度上的操作和控制物质材料，这两个理念引导下产生的分子电子学成为备受人们关注的交叉性学科。过去的六十年里，分子电子学获得了飞速的发展，尤其是世纪之交的十年可谓是“分子电子学的黄金十年”，科学家们接连得到单原子、单分子尺度上的物理化学性质并付诸应用。然而，分子电子学研究的基本结构单元仍是金属/分子/金属结，而其构筑方法的不稳定性和表征手段不重现及单一性仍然是分子结的构筑和表征研究中面临的主要困境。 本论文工作以构筑稳定分子结为目标 ...
冯石
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Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响
Conservation Biology, EarlyView.Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang +11 more
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Research on Key Issues in Eddy Current Nondestructive Evaluation of Residual Stress in Aluminum Alloy [PDF]
, 2015 铝合金作为制造业发展的基础材料，在航空航天、高速铁路、建筑工程、船舶制造、汽车工业等支柱产业中有着重要地位。残余应力往往是造成铝合金结构破坏的重要因素。有效的评价应力状态，特别是导致损伤出现的临界应力状态是评价设备结构强度、可靠性的重要依据。传统的无损检测方法已广泛应用于工程实际中，但大部分局限于对已成型的缺陷进行检测。对于可能导致损伤出现的隐性、不规律变化的残余应力状态的评价则较为困难。 目前，应用较多的残余应力检测法主要有盲孔法、X射线法、超声波法以及磁测法。这些方法在使用上都存在很大的局限性 ...
汪涛
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Conservation Biology, EarlyView.Abstract Prioritization in conservation is crucial for the development of efficient and effective decision‐making policies. For many decades, the importance of some species and their habitats has been assessed and applied in conservation legislation, but bats and their diurnal roosts have ofbeen overlooked.
David López‐Bosch +6 more
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