报告人:林国建副教授 中国人民大学信息学院
报告题目:Poisson-Nernst-Planck systems for ionic flow with ion size effects
时 间:2016年10月29日 (星期六) 15:00 ~ 17:00
地 点:理工北楼601报告厅
主 办:数学与计算机科学学院
参加对象:微分方程教研室全体老师及研究生
报告摘要:In this work, we analyze a Poisson-Nernst-Planck type model for ionic flow through a membrane channel. We consider two ion species, one positively charged and one negatively charged, and assume zero permanent charge. A local hard sphere potential of the excess component is included to account for ion size effects. The model problem can be treated as a boundary value problem ofa singularly perturbed differential system and our analysis is based on the geometric singular perturbation theory. The existence of solutions to the boundary value problem for small ion sizes is established and, treating the ion sizes as small parameters, we also derive an approximation of the I-V (current-voltage) relation and identity two critical potentials for ion size effects. Scaling laws of I-V relations and critical potentials in boundary concentrations are discussed.
专家简介:林国建:博士、副教授。2005年博士毕业于北京师范大学,2005-2007年中国科学院数学与系统科学研究院从事博士后研究,2007年至今中国人民大学信息学院工作。2011-2012年美国佐治亚理工学院数学系访问学者。研究方向是常微分方程与动力系统,目前的研究兴趣为多重时间尺度动力系统及其在Poisson-Nernst-Planck方程中的应用,已在《SIAM Journal of Applied Dynamical Systems》等杂志发表论文多篇。