With a modified analytical embedded atom method (MAEAM),structure stability and phonon spectra of fcc metals are calculated.A pair-potential function was proposed considering farther neighbor atomic interaction.A new truncated function and an enhanced smooth connection condition are used for the cutoff of pair potential.Model parameters are determined through fitting mono-vacancy migration energy,cohesion energy,three independent elastic constants and an equilibrium condition.Under same volume,we calculated binding energies of various metal structures.It shows that fcc structures of Ag,Al,Au,Cu,Ir,Ni,Pd,Pt and Rh are more stable.Energy-volume curves of these metals fit the results of Rose equation.Structure stabilities are proved with volume change.Phonon dispersions of fcc metals along[100],[110] and [111] directions agree with experiments and other calculations.

Effect of limited velocity on traffic flow is studied with cellular automaton.The simulation indicates that a saturated traffic flow determined by limited speed exists.The limited velocity results in various phase separations.In a fixed model,as the car density is low,two free-flow phases occur.As the density is high,a separation of maximum traffic flow phase from a free flow phase is observed.In an random model,as the density is high,a maximum flow-jamming-free flow appears.The traffic flow and critical density are given.