Jianzhu Gangjiegou Jinzhan圆钢管桁架在土木工程和海洋工程领域应用较多，除了承受竖向荷载外，还易遭受冲击偶然荷载作用。以偏心质量下抵抗冲击荷载的钢桁架为研究对象，利用LS-DYNA软件建立了节点冲击有限元模型。从破坏特征、冲击响应和耗能能力等方面研究了其抗冲击能力，对冲击次数、冲击速度和钢材屈服强度进行了参数分析，最后基于有限元模拟结果，提出了主管凹陷变形与转角之间的表达式。结果表明：经历多次摆锤冲击后，主管发生严重的凹陷变形，刚度显著降低；冲击速度达到3.0 m·s-1时，冲击力峰值提高了84.8 ...
张纪刚 +3 more
doaj
[Research on the simulation of daily activities and fall risk assessment for the elderly based on a long-strip static platform]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za ZhiChen Z +5 more
europepmc +1 more source
[Germline DDX41 mutations and myelodysplastic neoplasms]. [PDF]
Zhonghua Xue Ye Xue Za ZhiZhong Y, Xiao ZJ.
europepmc +1 more source
Gaoya dianqi发电机出口PT高压侧熔断器在非故障条件下频繁熔断，严重威胁发电厂的安全生产。在对PT高压熔断器解体分析和对运行情况统计分析后，呈现“慢熔”特征。文中按照现场实际参数搭建了计及电磁暂态变化过程的计算模型，对影响PT高压侧的暂态响应进行定量分析，分别讨论了倒送电、PT剩磁以及单相接地故障对PT高压熔断器的电磁暂态冲击效应，得出结论：合闸冲击、单相接地故障以及剩磁或多种暂态过程的叠加会给PT高压侧带来数倍于额定电流的电流冲击，电流冲击的长期累积效应对熔断器的疲劳特性造成影响从而推动熔体发生“慢熔 ...
莫仕勋 +5 more
doaj
[Price effects of global vaccine pooled procurement]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanHuang Y, Yu X, Xu M.
europepmc +1 more source
[Somatic and immune profiling of chemotherapy-associated aplastic anemia: a comparison with primary aplastic anemia and cancer without aplastic anemia]. [PDF]
Zhonghua Xue Ye Xue Za ZhiZhang YM, Zhou YX, Zhuang QL, Han B.
europepmc +1 more source
[Influencing Factors for Secondary Fungal Infections in Systemic Lupus Erythematosus]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanLi C +5 more
europepmc +1 more source
[Chemotherapy-related central nervous system injury in children with acute lymphoblastic leukemia: research progress]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiWang L +5 more
europepmc +1 more source
[Parent-child relationship and preschoolers' social skills: the cross-time chain mediating role of executive function and emotion regulation]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiLi YW +6 more
europepmc +1 more source
, 2011 本文对约束层为玻璃的激光冲击强化过程中产生的冲击波压力特征及其在介质里的衰减规律进行了研究。首先采用实验室研制的自由表面速度测量系统对冲击强化过程中靶体背表面的冲击中心位置质点速度进行了测量,得到了质点速度的时间波形。结果表明,测量系统捕捉到了由于弹性前驱波扰动所致的质点速度,为短时间尺度的冲击动力学实验提供了一种有力的测量手段。其次,发展了用于计算冲击波压力的耦合分析模型。模型中考虑了约束层 ...
王曦 +5 more
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