Fri, 25 Jul 2008 04:27:35 BST CiteULike: dchens Lai http://www.citeulike.org/user/dchen/author/Lai CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/1699098 <i>Physical Review Letters, Vol. 86, No. 1. (1 January 2001), 71.</i><br /><br />We study experimentally the jamming phenomenon of granular flow of monodisperse disks of D  =  5 mm diameter in a two-dimensional hopper with opening R . The jamming probability J ( d ) is measured where d ≡ R / D . We found that J ( d ) decreases from 1 to zero when d increases from 2 to 5. From observing the disk configurations of the arch in the jamming events; the jamming probability can be explained quantitatively by treating the arch as the trajectory of a restricted random walker. Jamming of Granular Flow in a Two-Dimensional Hopper Kiwing To Pik-Yin Lai HK Pak doi:10.1103/PhysRevLett.86.71 Physical Review Letters, Vol. 86, No. 1. (1 January 2001), 71. 2007-09-27T03:12:29-00:00 2001 Physical Review Letters 86 1 71 American Physical Society flow friction gains jamming http://www.citeulike.org/user/dchen/article/2547980 <i>Physical Review Letters, Vol. 100, No. 6. (2008)</i><br /><br />A granular clock is observed in a vertically vibrated compartmentalized granular gas composed of two types of grains with the same size. The dynamics of the clock is studied in terms of an unstable evaporation or condensation model for the granular gas. In this model, the temperatures of the two types of grains are considered to be different, and they are functions of the composition of the gas. Oscillations in the system are driven by the asymmetric collisions properties between the two types of grains. Both our experiments and model show that the transition of the system from a homogeneous state to an oscillatory state is via a Hopf bifurcation. Temperature Oscillations in a Compartmentalized Bidisperse Granular Gas Meiying Hou Hongen Tu Rui Liu Yinchang Li Kunquan Lu Pik Lai CK Chan doi:10.1103/PhysRevLett.100.068001 Physical Review Letters, Vol. 100, No. 6. (2008) 2008-03-18T00:51:22-00:00 2008 Physical Review Letters 100 6 APS 2008 grain people