拥挤剂粒子形状对大分子链成环动力学的影响

Using 3D Langevin dynamics simulations,we investigate the effects of the shape of crowders on the dynamics of a polymer chain closure.The chain closure in spherical crowders is dominated by the increased medium viscosity so that it gets slower with the increasing volume fraction of crowders.By contrast,the dynamics of chain closure becomes very complicated with increasing volume fraction of crowders in spherocylindrical crowders.Notably,the mean closure time is found to have a dramatic decrease at a range of volume fraction of crowders 0.36-0.44.We then elucidate that an isotropic to nematic transition of spherocylindrical crowders at this range of volume fraction of crowders is responsible for the unexpected dramatic decrease in the mean closure time.     

MESIS在重庆市应用的实现及改进

MESIS是基于地理信息、数据库、可视化、工作流、多媒体和WEB等多门综合信息技术的新一代气象服务产品分析制作系统,本研究在重庆应用过程中,利用python语言作为辅助,实现了地理范围制定,指标模型设置,显示风格修改等功能,实现了降雨和气温实况的后台自动成图,提高了气象制图和分析效率.