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The aerodynamic unstable critical wind velocity for three-dimensional open cable-membrane structures is investigated. The
geometric nonlinearity is introduced into the dynamic equilibrium equations of structures. The disturbances on the structural
surface caused by the air flow are simulated by a vortex layer with infinite thickness in the structures. The unsteady Bernoulli
equation and the circulation theorem are applied in order to express the aerodynamic pressure as the function of the vortex
density. The vortex density is then obtained with the vortex lattice method considering the coupling boundary condition. From
the analytical expressions of the unstable critical wind velocities, numerical results and some useful conclusions are obtained.
It is found that the initial curvature of open cable-membrane structures has clear influence on the critical wind velocities
of the structures. 相似文献
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碳纳米管因其独特的性质在生物检测方面具有广泛应用.本文基于DNA与多壁碳纳米管的相互作用而制成了作为一种新型纳米钓竿并用于水样中细菌的富集和检测.该钓竿的制备首先使用戊二醛为连接剂将经硅烷化处理的方形石英毛细管与氨基修饰的DNA相连,再依据单链DNA能缠绕多壁碳纳米管的性质将多壁碳纳米管固载在石英毛细管上制成一个纳米富集的钓竿装置.由于多壁碳纳米管与细菌细胞膜有较强的天然亲和力,因而能主动捕获细菌.实验证明,以大肠杆菌为目标检测菌,"纳米鱼竿"最短检测时间为15min,检测限为6.25×10CFU/mL,可以对饮用水等进行实时快速的细菌总数限量检测. 相似文献
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