| 1 | Stability analysis of a pipe conveying fluid with a nonlinear energy sink显示文摘This paper considers the global stability problem of the system comprising a pipe conveying fluid and a nonlinear energy sink(PCF-NES)system.First,a quadratic form model containing a gradient term of a convex function is obtained from a high-order partial-differential-equation model of the PCF-NES system using the Galerkin approximation approach.Energy and disturbance functionals are then established based on this model.Second,a Lyapunov function is constructed based on the first-order characteristic of the convexity and energy disturbance technique to prove the global exponential stability of the approximated PCF-NES system.Finally,theoretical results are verified using numerical simulations and the positive effect of the NES on the vibration control of the entire PCF is discussed. | Nan DUAN Sida LIN Yuhu WU Xi-Ming SUN Chongquan ZHONG | 2021 | Science China(Information Sciences)2021，64，5： | 2 |
| 2 | A facile solution phase synthesis of directly ordering monodisperse FePt nanoparticles显示文摘The ordered Pt-based intermetallic nanoparticles(NPs)with small size show superior magnetic or catalytic properties,but the synthesis of these NPs still remains a great challenge due to the requirement of high temperature annealing for the formation of the ordered phase,which usually leads to sintering of the NPs.Here,we report a simple approach to directly synthesize monodisperse ordered L1_(0)-FePt NPs with average size 10.7 nm without further annealing or doping the third metal atoms,in which hexadecyltrimethylammonium chloride(CTAC)was found to be the key inducing agent for the thermodynamic growth of the Fe and Pt atoms into the ordered intermetallic structure in the synthetic process.In particular,10.7 nm L1_(0)-FePt NPs synthesized by the proper amount of CTAC show a coercivity of 3.15 kOe and saturation magnetization of 45 emu/g at room temperature.The current CTAC-assisted synthetic strategy makes it possible to deeply understand the formation of the ordered Pt-based intermetallic NP in solution phase synthesis. | Yongsheng Yu Lin He Junjie Xu Jiaming Li Sida Jiang Guanghui Han Baojiang Jiang Wenjuan Lei Weiwei Yang Yanglong Hou | 2022 | Nano Research2022，15，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员