Past Events
Scientific, Seminar
Bijective counting of one-face maps on surfaces
November 18, 2009
University of British Columbia
A one-face map is a graph embedded in a compact surface, in such a way that its complement is a topological disk. Dually, it can be viewed as a polygon of even size, in which edges have been pasted pairwise to create a surface. These objects have...
Scientific, Seminar
Stable and efficient evaluation of periodized Green's functions for the Helmholtz equation at high frequencies
November 17, 2009
University of British Columbia
We present a new algorithm for the evaluation of the periodized Green's function for Helmholtz equation in two and three dimensions. A variety of classical algorithms (based on spatial and spectral representations, Ewald transformation, etc.) have...
Scientific, Seminar
Math Biology Seminar: Branching Processes in Evolutionary Epidemiology
November 17, 2009
University of British Columbia
The emergence of novel infectious diseases has become a major public health concern, with zoonotic diseases such as avian and swine flu providing prominent examples. Although initially poorly adapted to their new host, such pathogens have the...
Scientific, Seminar
Algebraic Geometry Seminar: Goresky-MacPherson duality and deformations of Koszul algebras
November 16, 2009
University of British Columbia
Goresky and MacPherson observed that certain pairs of algebraic varieties with torus actions have equivariant cohomology rings that are "dual" in a sense that I will define. Examples of such pairs come up naturally in both representation theory and...
Scientific, Conference
Mini-symposium in PDE
November 12–13, 2009
University of British Columbia
Reinhard Illner (University of Victoria), Traffic flow and traffic jams: from kinetic theory to functional differential equations I will speak on certain kinetic and macroscopic models of traffic flow. After a review of the concept of a fundamental...
Scientific, Seminar
DG-MP-PDE Seminar: Traffic flow and traffic jams: from kinetic theory to functional differential equations
November 12, 2009
University of British Columbia
I will speak on certain kinetic and macroscopic models of traffic flow. After a review of the concept of a fundamental diagram the high-density regime will be considered, and the emergence of macroscopic models with nolocalities will be discussed...
Industrial, Lunchbox Lecture
Applying the phase congruency algorithm to seismic data slices
November 12, 2009
University of Calgary
A common problem in seismic interpretation is the search for discontinuities such as faults. The usual approach to identifying these features is the coherency method (Bahorich and Farmer, 1995). The phase congruency algorithm detects corners and...
Scientific, Seminar
Math Biology Seminar: A Numerical Model of Cellular Blebbing
November 10, 2009
University of British Columbia
In animal cells, a "bleb" is a balloon-like protrusion of the plasma membrane that forms when the membrane separates from the underlying cytoskeletal network and is pushed outward by pressure-driven cytosol. The protrusion later retracts due to the...
Scientific, Seminar
DG-MP-PDE Seminar: Fourth order diffusion with geometric link to second order diffusion
November 10, 2009
University of British Columbia
We describe a fourth order family generalizing the linear-mobility thin film equation on R^n. In joint work with R. McCann we derive formally sharp converence rates to self-similarity, using a link to Denzler-McCann's analysis of a second order...
Scientific, Seminar
SCAIM Seminar: Advanced Higher Order Finite Elements - From Theory to Application with Netgen/NGSolve
November 10, 2009
University of British Columbia
In this talk the Meshing program Netgen and the Finite Element library NGSolve are introduced. The possibilities of this software package will be highlighted with the help of two modern examples for Advanced Higher Order Finite Element Methods: A...