OREGON STATE UNIVERSITY
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Dray received the Elizabeth P. Ritchie Distinguished Professor Award and MAA-PNW 2014 Distinguished Teaching Award
Waymire recognized for exceptional service to the Institute of Mathematical Statistics
Undergraduate research experiences in the Mathematical Sciences

Events

Oct
02
2014

Starting from the famous Ross-Macdonald epidemic model which describes the infection dynamics of malaria for a collection of isolated patches, we construct a coupled multi-patch infection model. The coupling is caused by the fact that humans move between patches, and hence can pick up the infection in one patch and later introduce it in another patch. A central question in this context is how sources and sinks can be distinguished from one another. An isolated patch is called a sink (source) if its corresponding basic reproduction number is less (larger) than 1.

Oct
03
2014
Applied Mathematics and Computation Seminar Juan Restrepo Nearshore Sticky Waters

I will describe and explain a mechanism whereby pollutants such as oil slicks coming to shore by the action of ocean currents will slow down and possibly even park itself just beyond the surf zone.

Oct
06
2014

Textural equilibrium develops if the solid-liquid reaction kinetics is fast or time scales are long and is therefore common in partially molten materials. Similar behavior is observed in  development of connected water network in polycrystalline ice in polar ice sheets as well as formation of connected brine networks in rock salt. Rock salt and its permeability  is of specific interest in petroleum exploration: thick layers of salt cannot  be avoided in Gulf of Mexico fields.

Oct
06
2014

Modeling multi-phase fluid flow in the subsurface is a notoriously difficult challenge.  One must account for processes occurring on a broad range of scales; typically different modeling approaches are needed at different length scales so that the underlying physics can be properly described. At the pore scale (with grain size ranging from micron to milimeter, direct simulation of Stokes flow in a medium with rich geometry is extremely costly.

Oct
07
2014

In 1997, van Hamme developed p-adic analogs, of several series which relate hypergeometric series to values of the gamma function, originally studied by Ramanujan.  These analogs relate truncated sums of hypergeometric series to values of the p-adic gamma function, and are called Ramanujan type supercongruences.  In all, van Hamme conjectured 13 such formulas, three of which were proved by van Hamme himself, and a handful of others have been proved recently using a wide range of methods.