Seminars and Colloquiums
for the week of February 11, 2008
Speakers:
Professor Xia Chen, Monday
Professor Roland Glowinski, Tuesday
Professor David Anderson, Wednesday
Mr. Chris Sass, Wednesday
Monday, February 11
PROBABILITY SEMINAR
TIME: 10:10 – 11:00 a.m.
ROOM: Ayres 309A
SPEAKER: Professor Xia Chen
TITLE: “Limit Laws For The Energy Of A Charge Polymer”
ABSTRACT: In the physics literature, the geometric shape of certain polymers is often modeled by an interpolation line segment with the vertice given as the n-step lattice (simple) random walk. Place a random electric charge – 1 or 1 to each of n vertice of the polymer and suppose that the random charges forms an i.i.d. sequence independent of the polymer. Assume that when two charges meet, the pair with opposite sign gives negative contribution while the pair with same sign gives positive contribution. In this talk, I will speak on some recent progress on the limit laws for the total charges of the polymer generated in this way of interaction.
Tuesday, February 12
MATHEMATICS COLLOQUIUM
TIME: 3:40 – 4:30 p.m.
ROOM: Ayres 214
SPEAKER: Professor Roland Glowinski
TITLE: “Numerical simulation of particle clustering for particulate flow in a spinning cylinder”
ABSTRACT: The main goal of this lecture is to address the numerical simulation of a phenomenon which has been observed experimentally, namely: the clustering of particles in sub-populations of essentially equal size when a circular cylinder containing a mixture rigid solid particles / incompressible viscous fluid spins with a sufficiently large angular velocity. The numerical simulator relies on the combination of (i) a time discretization by operator-splitting; (ii) a fictitious domain method allowing a uniform mesh based finite element approximation (of the Bercovier-Pironneau type) in three space dimensions. The results of our numerical simulations are consistent with the experimental ones and show that, indeed, particle clustering takes place when the spinning angular velocity is sufficiently large.
Wednesday, February 13
ALGEBRA SEMINAR
TIME: 3:35 – 4:25 p.m.
ROOM: Ayres 309A
SPEAKER: Professor David Anderson
David Anderson will continue speaking on ultra filters and ultraproducts in commutative ring theory.
ANALYSIS SEMINAR
TIME: 3:35 – 4:25 p.m.
ROOM: Ayres 209A
SPEAKER: Mr. Chris Sass
TITLE: “Smale’s Conjecture on Critical Points of Polynomials, I”
Interested in giving or arranging a talk? Check out our calendar.
Previous Announcements:
Week of:
Seminars from 2006-2007 academic year