Gang Sun
Chinese Academy of Sciences
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Publication
Featured researches published by Gang Sun.
Journal of Physics: Condensed Matter | 2005
Wenjiang Li; Gang Sun; Fangqiong Tang; Wing Yim Tam; Jensen Tsan Hang Li; Che Ting Chan; Ping Sheng
We report the fabrication of metal-infiltrated silica opals for optical studies. Highly mono-dispersed silica microspheres are fabricated and assembled by a force packing method to form opals with large domain sizes. The opals are then infiltrated with gold by an electroplating technique. The optical properties of the infiltrated opals in the visible range are studied and model calculations based on a multiple-scattering formalism are used to interpret the experimental results. The calculated position of the directional gap of the silica opal agrees very well with experimental observation. We found that the optical properties of the infiltrated sample can be explained using a model system in which the voids in the silica opal are partially filled with Au and the surface of the slab is covered with a thin layer of Au.
Powder Technology | 2018
Hongwei Zhu; Yaodong Feng; Danfeng Lu; Yahya Sandali; Bin Li; Gang Sun; Ning Zheng; Qingfan Shi
Abstract The dynamical behavior of the column that made up binary granular beads is investigated systematically by tracking the displacement of particles in the collapse process. An experimental setup is first devised to control the quasi-static collapse of a granular column, and then observe the trajectories of tracer particles by using an industrial camera controlled by the image acquisition program. It is found that there exist two zones in column: a sliding region in which particles are moving in a layered structure; a static region within which particles are stationary. According to this analytical result, a dynamical model is developed to predict the trajectory evolution of particles in the space-time. The calculating result for the trajectories of particles on the selected layers is well consistent with the experimental observation.
Modern Physics Letters B | 2014
Qingfan Shi; Beicheng Pan; Changhong Lu; Gang Sun
In this paper, the vertically vibrated binary granular mixtures at atmospheric pressure are studied experimentally. We find a nonstationary segregation state, of which the structure changes with time cyclically. The period of the cyclic segregation is measured and its variation with the vibration conditions is shown. The transition between the segregation states is also discussed, and a phase diagram on the plot of frequency against acceleration amplitude is given. In order to observe the effect of air flow in the segregation process, an alternative container with ventilated bottom is designed. Our experiments show that both regions of the Brazil nut segregation state and the cyclic segregation state shrink obviously by use of the latter container and disappear completely if the whole system is placed in vacuum. These results testify that the air pressure plays a positive role in both the Brazil nut effect and cyclic segregation.
Physical Review B | 2009
Chaojun Tang; Zhenlin Wang; Weiyi Zhang; Shining Zhu; Nai-Ben Ming; Gang Sun; Ping Sheng
Physical Review B | 2006
Jensen Tsan Hang Li; Gang Sun; Che Ting Chan
Physical Review E | 2012
Pingping Wen; Ning Zheng; Liangsheng Li; Heng Li; Gang Sun; Qingfan Shi
Physical Review E | 2006
Gang Sun; Che Ting Chan
Physica A-statistical Mechanics and Its Applications | 2009
Jia Liu; Qingfan Shi; Xuanwen Liang; Lei Yang; Gang Sun
Physical Review E | 2006
Decai Huang; Gang Sun; Kunquan Lu
Physical Review E | 2013
Xiaoxian Yuan; Ning Zheng; Qingfan Shi; Gang Sun; Liangsheng Li