演讲人：诸蜀宁博士时间：2009年3月30日（星期一）下午 2：30时地点：致远楼107室演讲人简历：1985年四川大学数学系毕业，1990年美国乔治城大学经济系获博士学位，后历任世界银行高级经济师，汇丰银行高级经理，现任渣打银行新资本协议实施办主任。欢迎大家参加

报告人：教授 University of Oregon，USA时间：2009年7月16号下午 13：30 — 17：00 （未完待续）地点：致远楼10

报告人：莫毅明 教授 （香港大学）题 目：Projective-algebraicity of minimal compactifications of non-arithmetic ball quotients时 间：2010年5月14日下午4：00-5：00地 点：数学系107会议

Let G be a simple algebraic group over a field of positive characteristic, B a Borel subgroup of G, and F the Frobenius morphism on the flag variety B = G/B. A splitting of the comorphismF#:OB→F*OB via a→ap, due to Mehta and Ramanathan, marked a breakthrough in the study of the geometry of B regardless of characteristic. We will describe a construction of a splitting of the Frobenous morphism on the algebra of distributions Dist G on G. This is joint work with Michel Gros.

多复变与复几何系列学术报告(TJ-Seminar on Several Complex Variables and Complex Geometry)演讲人: 符斯奇教授（Rutgers大学）题目：Spectrum of the d-bar-Neumann Laplacian时间：2008年1月15日 数学系106室 3：30-5：00 p. m.地点：数学系106室欢迎大家参

报告人：华东师范大学数学系 舒斌教授题 目：Modular Representations of Supergroups时 间：2008年3月24日星期一下午3:30—5:00地 点：数学系致远楼106室欢迎各位参加

In an evolution model, a constant equilibrium is often stable if the perturbation is also constant one, hence it is dynamically stable with respect to an ODE dynamics. More realistic models often include the effect of spatial dispersal. In classicalTuring reaction- diffusion model, an instability is caused by diffusion with different diffusion coefficients, and it generates non-constant equilibria via bifurcation. In a model with attractive and repulsive chemotaxis, and another model with advection, we show that instability of a constant equilibrium can be caused by advection or chemotaxis. In both cases, Hopf bifurcations occur so oscillatory states emerge as the result of instability. The talk is based on joint work with Ping Liu, Zhian Wang, and Jun Zhou.

I will give a brief introduction of delayed differential equations, and show that the question of stability of an equilibrium solution is equivalent to an algebraic equation with transcendental terms. Then I will show the new method of solving the purely imaginary eigenvalues 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 a generalreaction-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.