|Refreshments and reception ||Refreshments and reception ||EWG536||Refreshments and reception in 536 Ewing Hall • 4:30pm||11/16/2018 9:30:00 PM||11/16/2018 10:00:00 PM||False|
|Bjorn Engquist, the University of Texas at Austin||Bjorn Engquist, the University of Texas at Austin||Gore 104||<br><br>Title:Optimal Transport for Seismic Imaging<br>
Abstract: In Full Waveform Inversion (FWI) seismic imaging is formulated as PDE constrained minimization where the miss-match between measured and computed signals plays an important role. The purpose is to find properties in the earth such as wave velocity and location of reflecting sub layers, which are represented by the coefficients in the PDE. We propose using optimal transport and the Wasserstein metric for this miss-match in order to reduce the risk of only finding local minima in the PDE constrained minimization. The optimal transport can be given by the gradient of the solution to a Monge–Ampère equation. Numerical examples comparing these new techniques with the classical L2 miss-match will be presented.
Refreshments and reception in 536 Ewing Hall • 4:30pm||11/16/2018 8:30:00 PM||11/16/2018 9:30:00 PM||False|
|Carl Rees Lectures in Mathematical Sciences||Carl Rees Lectures in Mathematical Sciences||Gore 104||Title: Control of Plasmon on Graphene<br>Colloquium Talk<br><br>
Speaker: Fadil Santosa, University of Minnesota
Description: Graphene has been demonstrated to be desirable matherical for concentrating plasmons due to its low loss property. We investigate the problem of controlling graphene plasmons by changing the conductivity of the sheet as a function of time. We show that wave reversal, amplification, and standing waves are possible by manipulating the conductivity.
Refreshments and reception in 536 Ewing Hall • 4:30pm||9/28/2018 7:30:00 PM||9/28/2018 8:30:00 PM||False|
|Colloquium Series & UD Data Sciences Institute||Colloquium Series & UD Data Sciences Institute||Memorial Hall 127||Title: Adaptive Methods for the Simulation of Diffusion in Complex Geometries<br><br>
Speaker: Leslie Greengard
Description: We will review the state of the art in integral equation methods for the solution of the heat equation in moving geometries. With suitable fast algorithms, such methods achieve optimal complexiy and, in th homogeneous case, require the discretization of the space-time boundary alone. They achieve higher order accuracy with suitable quadratures and are straightforward to implement adaptively in space-time. We will discuss applications to biophysical modeling, reaction-diffusion systems, and computational fluid dynamics. ||9/28/2018 2:00:00 PM||9/28/2018 3:00:00 PM||False|
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