A Cellular Automaton Model for Heterogeneous and Incosistent Driver Behavior in Urban Traffic

In this paper a cellular automaton model is proposed to describe driver behavior at a single-lane urban roundabout. Driver behavior has been considered as heterogeneous and inconsistent. Most traffic papers in the literature just discussed heterogeneous driver behavior, to our best knowledge. Two truncated Gaussian distributions are used to model heterogeneous and inconsistent driver behavior, respectively. The physical meanings of two truncated distributions are indicated. This method may help enhance a better understanding of driver behavior at roundabout traffic, and even possibly provide references for roundabout design and management.     

Simulation study on characteristics of long-range interaction in randomly asymmetric exclusion process

In this paper we investigate the dynamics of an asymmetric exclusion process on a one-dimensional lattice with longrange hopping and random update via Monte Carlo simulations theoretically. Particles in the model will firstly try to hop over successive unoccupied sites with a probability q, which is different from previous exclusion process models. The probability q may represent the random access of particles. Numerical simulations for stationary particle currents, density profiles, and phase diagrams are obtained. There are three possible stationary phases: the low density(LD) phase, high density(HD) phase, and maximal current(MC) in the system, respectively. Interestingly, bulk density in the LD phase tends to zero, while the MC phase is governed by α, β, and q. The HD phase is nearly the same as the normal TASEP,determined by exit rate β. Theoretical analysis is in good agreement with simulation results. The proposed model may provide a better understanding of random interaction dynamics in complex systems.     

热分析在PP-R专用料性能评价中的应用

运用差示扫描量热法(DSC)和动态热机械分析法(DMA),测试了PP-R的结晶度、结晶和熔融半峰宽、储能模量和玻璃化转变温度等参数,通过比较这些参数并依据热分析相转变的相关理论,比较了两种PP-R的数均分子量及其分布和可能的力学性能;提供并验证了运用热分析测试手段,快速进行样品分子量及其分布和力学性能评价的方法.