为提高我校数学研究水平，增进学术交流，数学科学学院特邀请香港理工大学王志安教授和美国威廉玛丽学院史峻平教授来我院做专题报告。具体安排如下：

一、报告人：王志安 （香港理工大学）

题目：化学驱动模型中的吸引和排斥的竞争影响

摘要：Most of past and current researches on chemotaxis models deal with attraction and repulsion separately. But in some biological processes (or experiments), species often interact with the combined attraction and repulsion to accomplish some biological objects. Hence an attraction and repulsion chemotaxis model will be more realistic than the attraction or repulsion chemotaxis model alone in this scenario. In this talk, we shall present the first mathematical results on an attraction-repulsion chemotaxis model and show the interplay of these two opposed biological processes. Pattern formations will be shown and various open questions will be presented.These results are based on the joint works with Ping Liu (Harbin Normal University), Junping Shi (College of William and Mary) and Youshan Tao (Donghua Univeristy).

时间：2012年10月22日上午10点

地点：哈师大理工一号楼337

二、报告人： 史峻平（美国威廉玛丽学院)

龙江学者 特聘教授

题目：在一般反应扩散模型中时滞引起的不稳定性与Hopf分支

摘要：The distribution of the roots of a second order transcendental polynomial is analyzed, and it is used for solving the purely imaginary eigenvalue of a transcendental characteristic equation with two transcendental terms. The results are applied to the stability and associated Hopf bifurcation of a constant equilibrium of general reaction-diffusion system or ordinary differential equation with delay effects. Examples from chemical reaction and predator-prey models are analyzed using the new techniques. In particular the stability and associate Hopf bifurcation of a Gierer-Meinhardt system with the gene expression time delays is analyzed by using our method. This is a joint work with Shanshan Chen, and Junjie Wei.

时间：2012年10月23日下午三点

地点： 哈师大理工一号楼337

数学科学学院

2012年10月17日