The observations of microorganisms revealed how they swim.As inspired by them,studies on artificial micro-robots with various actuation mechanisms have been thriving.To elucidate the essential concepts in understanding the dynamic behaviors of natural and
We present a new test method for the accurate measurement of the transverse tensile interfacial strength of rare-earth barium copper oxide(REBCO)-coated conductor(CC)tapes to overcome heavy scattering of data tested using regular test methods.A new compos
The hydrogen effect on the nucleation and motion of dislocations in single-crystal bcc Fe with(110)surface was investigated by both nanoindentation experiments and discrete dislocation dynamics(DDD)simulation.The results of nanoindentation experiments sho
通过Midas Civil有限元软件建立拱圈模型和拱圈-拱上结构联合作用模型,对空腹式无铰拱桥进行仿真模拟,引入联合作用系数K,运用系数k对比分析两种结构状态下的计算结果.联合作用下填料有利于拱板应力分布更趋于合理化;横桥向联合作用系数趋势基本一致,但反映出填料约束作用中间优于边缘效果,改善主拱结构的受压状态,降低了拱的挠度约10％,从而提高了拱圈稳定性.联合作用模型可全面真实地反映主拱的实际受力状态.拱上填料的存在分散集中荷载,保证均匀传递,使拱圈的内力得到削弱;现行规范却忽视了拱上结构与拱圈共同作用对
目的:对比不同方案在Hp阳性慢性胃炎患者中的应用价值.方法:90例Hp阳性慢性胃炎患者随机分组,对照组予奥美拉唑、磷酸铝凝胶、羟氨苄青霉素与克拉霉素,观察组予埃索美拉唑、胶体果胶铋胶囊、阿莫西林与呋喃唑酮,两组均持续给药4周后评估疗效.结果:观察组总有效率(97％VS85％)、幽门螺杆菌(Hp)根除率(93％VS78％)高于对照组(P<0.05).症状缓解时间(2.13±0.58天VS3.54±0.65天)和住院时间(4.11±1.05天VS6.33±1.23天)短于对照组(P0.05).结论:含铋剂方案
In this paper,a semi-discrete model based on peridynamics(PD)for engineered cementitious composites(ECCs)is applied to simulate the fracture behavior of functionally graded ECC(FGECC)beams.This is a new application of PD in ECC.Prior to simulating the cra
In this work,two typical interfaces are established for the antisymmetric plate wave by introducing linear defect in between phononic crystals with opposite valley Hall phases.The evolution of projected curves is demonstrated as the defect width increases
A novel elastic sandwich metamaterial plate with composite periodic rod core is designed,and the frequency band-gap characteristics are numerically and experimentally inves-tigated.The finite element and spectral element hybrid method(FE-SEHM)is developed
In this paper,a local surface nanocrystallization technology is used for thin-walled structures with square cross sections,and an energy absorption device of two-staged combined energy absorption structure is proposed.In virtue of the surface nanocrystall
As conducting an impact hammer testing during experimental modal analysis,the multiple impact phenomenon must be avoided.It is generally recognized that the multiple impact phenomenon is induced by the tester\'s improper operation and can be avoided thr