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Search Results: 1 - 10 of 4574 matches for " Guoqing Miao "
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Study of two-section composite chain of beads under vertical vibration
Mang Ding,GuoQing Miao
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5037-y
Abstract: We investigated the dynamic properties of a two-section composite chain of beads under vertical vibration. By analyzing the chain’s motion, including phase-shift, mean dilation, center-of-mass displacement, and energy, we found that with different bead arrangements, the chain behaved in different ways. We believe that interaction existing at the interface between bead sections provides the underlying cause. This interaction causes different energy in different arrangements, which leads to different dynamic characteristics.
Cluster model for wave patterns of a 3D vertically vibrated granular system
Hui Cai,GuoQing Miao
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4426-y
Abstract: Based on the cluster model for wave-like motions of a 2D vertically vibrated granular system we established previously (Chin Phys Lett, 2010, 27: 124501), a generalization of the cluster model for a 3D granular system is presented in this paper. The 3D cluster model proposes frustums of pyramids as clusters of the 3D granular system, and explains wave patterns as the result of the cluster-boundary and cluster-plate collisions. By analyzing the movement of one cluster in a collision period, we derive a basic equation, which relates the internal characteristic parameter to the external driving parameters. The theoretical results reproduce the behaviors of wave patterns as changes in the driving parameters, and the 3D dispersion relation, which agree with the experimental results.
Formation and transport of granular heaps in vertically vibrated containers with periodic corrugated bottoms
Hua Zhang,Qi Wang,GuoQing Miao
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0022-1
Abstract: We report the formation and transportation of granular heaps in vertically vibrated containers with two types of periodic corrugated bottoms: one with a periodic array of ten identical plexiglas rectangles mounted (named the periodic container), and the other with a single-step (named the single-step container). For the periodic container, when the excitation was weaker, several small heaps formed, and the number of them was the same as that of the rectangles on the bottom. As the excitation increased, the system presented three types of states: single well-defined heap, weaker wave, and stronger wave. Some local convections were observed in the interior of heap. For the single-step container, we observed the transportation of a heap toward step. We propose that the compressive force from the ambient gas plays a crucial role in the movement of the heap.
Formation and transport of granular heaps in vertically vibrated containers with periodic corrugated bottoms
ZHANG Hua,WANG Qi,MIAO GuoQing,

科学通报(英文版) , 2008,
Abstract: We report the formation and transportation of granular heaps in vertically vibrated containers with two types of periodic corrugated bottoms: one with a periodic array of ten identical plexiglas rectangles mounted (named the periodic container), and the other with a single-step (named the single-step con-tainer). For the periodic container, when the excitation was weaker, several small heaps formed, and the number of them was the same as that of the rectangles on the bottom. As the excitation increased, the system presented three types of states: single well-defined heap, weaker wave, and stronger wave. Some local convections were observed in the interior of heap. For the single-step container, we ob-served the transportation of a heap toward step. We propose that the compressive force from the am-bient gas plays a crucial role in the movement of the heap.
An experiment on multibubble sonoluminescence spectra in sodium chloride solution
Zhan Chen,JunFeng Xu,Wei Huang,WeiZhong Chen,GuoQing Miao
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0216-6
Abstract: We investigated experimentally the spectra of MBSL in sodium chloride water solution with krypton as dissolved gas. We observed and compared the spectra of hydroxyl ion at 310 nm and that of sodium atom at 589 nm. It has been found that under the same experimental condition, the intensity of sodium atom spectra is obviously higher than that of the hydroxyl ion spectra, and is more sensitive to the experimental condition. The krypton content, the concentration of sodium chloride solution, and the driving sound pressure obviously affect the spectra intensity in certain range.
Situs inversus totalis with carcinoma of gastric cardia: a case report
Ke Pan,Dewu Zhong,Xiongying Miao,Guoqing Liu
World Journal of Surgical Oncology , 2012, DOI: 10.1186/1477-7819-10-263
Abstract: Situs inversus is an uncommon anomaly with rare incidence. Some cases of situs inversus totalis have been described with different types of associations. Here we report a case of situs inversus with carcinoma of the gastric cardia.
Simulation Study of Internal and Surface waves of Vertically Vibrated Granular Materials
Kai Huang,Guoqing Miao,Peng Zhang,Yifei Zhu,Rongjue Wei
Physics , 2005,
Abstract: Molecular dynamical (MD) simulations are performed to simulate two dimensional vibrofluidized granular materials in this work. Statistics on simulation results indicate that there exist shocks propagating upward in each vibrating cycle. Under certain driving parameters surface waves similar to Faraday instability in normal fluid coexist with internal waves. Relationship between the two kinds of waves is explored. Moreover simulation results indicate that periodically structured bottom can change the dispersion relationship and amplitude of surface waves.
Dynamic Behaviors of Supersonic Granular Media under Vertical Vibration
Kai Huang,Peng Zhang,Guoqing Miao,Rongjue Wei
Physics , 2005,
Abstract: We present experimental study of vibrofluidized granular materials by high speed photography. Statistical results present the averaged dynamic behaviors of granular materials in one cycle, including the variations of height, velocity and mechanical energy of the center of mass. Furthermore, time-space distribution of granular temperature which corresponds to the random kinetic energy shows that a temperature peak forms in the compression period and propagates upward with a steepened front. The Mach number in the steepened front is found to be greater than unity, indicating a shock propagating in the supersonic granular media.
Shock wave propagation in vibrofluidized granular materials
Kai Huang,Guoqing Miao,Peng Zhang,Yi Yun,Rongjue Wei
Physics , 2005, DOI: 10.1103/PhysRevE.73.041302
Abstract: Shock wave formation and propagation in two-dimensional granular materials under vertical vibration are studied by digital high speed photography. The steepen density and temperature wave fronts form near the plate as granular layer collides with vibrating plate and propagate upward through the layer. The temperature front is always in the transition region between the upward and downward granular flows. The effects of driving parameters and particle number on the shock are also explored.
Formation and transportation of sand-heap in an inclined and vertically vibrated container
Guoqing Miao,Kai Huang,Yi Yun,Peng Zhang,Weizhong Chen,Xinlong Wang,Rongjue Wei
Physics , 2005, DOI: 10.1103/PhysRevE.74.021304
Abstract: We report the experimental findings of formation and motion of heap in granular materials in an inclined and vertically vibrated container. We show experimentally how the transport velocity of heap up container is related to the driving acceleration as well as the driving frequency of exciter. An analogous experiment was performed with a heap-shaped Plexiglas block. We propose that cohesion force resulted from pressure gradient in ambient gas plays a crucial role in enhancing and maintaining a heap, and ratchet effect causes the movement of the heap. An equation which governs the transport velocity of the heap is presented.
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