Education is not the filling of a pail, it is the lighting of a fire. - W. B. Yeats

 

NEWS in the Department of Mathematics
Graduate Announcements


Bahaudin Hashmi - PhD preliminary examination
Date: Monday, June 27, 2016
Place: Weber 201
Time: 10:00 a.m.

Title: 
Pattern Formation in Reaction Diffusion Systems and Ion Bombardment of Surfaces

Advisor:
Dr. Patrick Shipman   Co-Advisor: Dr. James Liu

Committee:  
Dr. Dan Bates, Dr. Stephen Thompson

Abstract: 
In this talk we consider two different projects: (1) Liesegang ring formation in the ammonia and hydrogen chloride reaction and (2) the ion bombardment of a binary crystalline material. In the reaction diffusion system, we analyze the reaction between ammonia and hydrogen chloride that produces Liesegang rings. Liesegang ring formation is a special type of chemical pattern in which a spatial order is formed by density fluctuations of a weakly soluble salt. In the ion bombardment of surfaces, we bombard a binary crystalline material at normal incidence. We conduct a linear stability analysis and determine regions in the parameter space that produce highly ordered square pyramids.