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RISS 인기검색어
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- 저자 : Hongliang Chang (검색결과 3 건)
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Ultrasonic Synthesis of Au/AgCl Hybrid Cubes and Their Evolution Under Electron Beam Irradiation
Hongliang Cao,Xiaoli Miao,Mengqin Zhu,Chang Li,Feifei Wei,Xin Chen 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.6
The utilization of ultrasound offers a facile tool for the synthesis of Au/AgCl hybrid particles. We have obtained the architectures of Au nanoparticles on AgCl sub-micrometer cubes by simply ultrasonic irradiating their precursors in ethylene glycol (EG). The formation process of Au/AgCl hybrid particles in the reaction solution has been studied based on the optical absorption spectra and the scanning electron microscope (SEM) images of the particles obtained at different ultrasonic irradiation stages. The dynamic changes of Au/AgCl hybrid particles under electron beam irradiation have been investigated in both SEM and in situ liquid cell transmission electron microscope (TEM). Hollow Au/AgCl hybrid particle structures have been obtained under the electron beam irradiation in liquid, with the cuboid contour shape preserved.
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Zhiming Xu,Hongliang Chang,Bingbing Wang,Jingtao Wang,Qi Zhao 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
The present study examined the effect of electric fields in calcium carbonate (CaCO 3 ) scale formation on a heat transfer surface. The effects of electric fields ranging from 0 V to 4000 V on the fouling properties of CaCO 3 were investigated. Results showed that the optimal electric voltage was approximately 500 V, at which the asymptotic value of fouling resistance and the deposited weight were minimal and corresponded to 52.8 % and 61.3 % reductions, respectively, compared with the results recorded at 0 V. At higher voltages of 3000 V or 4000 V, the asymptotic value of fouling resistance and the weight of fouling deposits increased relative to those obtained at 0 V. The scanning electron microscope images of the fouling deposits obtained at 0 V showed mainly aragonites with sharp and needle-like crystal structures. The structure of CaCO 3 fouling changed from aragonites to spherical vaterites as the applied voltage was increased.
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Auto-parametric resonance of framed structures under periodic excitations
Yuchun Li,Hongliang Gou,Long Zhang,Chenyu Chang 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.4
A framed structure may be composed of two sub-structures, which are linked by a hinged joint. One sub-structure is the primary system and the other is the secondary system. The primary system, which is subjected to the periodic external load, can give rise to an auto-parametric resonance of the second system. Considering the geometric-stiffness effect produced by the axially internal force, the element equation of motion is derived by the extended Hamilton\'s principle. The element equations are then assembled into the global non-homogeneous Mathieu-Hill equations. The Newmark\'s method is introduced to solve the time-history responses of the non-homogeneous Mathieu-Hill equations. The energy-growth exponent/coefficient (EGE/EGC) and a finite-time Lyapunov exponent (FLE) are proposed for determining the auto-parametric instability boundaries of the structural system. The auto-parametric instabilities are numerically analyzed for the two frames. The influence of relative stiffness between the primary and secondary systems on the auto-parametric instability boundaries is investigated. A phenomenon of the \"auto-parametric internal resonance\" (the auto-parametric resonance of the second system induced by a normal resonance of the primary system) is predicted through the two numerical examples. The risk of auto-parametric internal resonance is emphasized. An auto-parametric resonance experiment of a
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