Seminars and Colloquiums
for the week of October 26, 2009
Speaker:
Dr. Sreekanth Pannala, Oak Ridge National Laboratory, Computer Science and Mathematics Division, Monday
Professor Souvik Ghosh, Columbia University, Monday
Mr. Jon Gray, Wednesday
Professor Stefan Richter, Wednesday
Professor Fernando Schwartz, Wednesday
Professor Suzanne Lenhart, Thursday
Professor Tim Schulze, Friday
Monday, October 26
MATHEMATICS COLLOQUIUM
TIME: 3:35 – 4:25 p.m.
ROOM: HBB 102
SPEAKER: Dr. Sreekanth Pannala, Oak Ridge National Laboratory, Computer Science and Mathematics Division
TITLE: “Bridging atomistic to continuum scales for designing energy materials: challenges and opportunities”
ABSTRACT: The challenging aspect of modeling energy materials (nuclear fuel, biomass, electrodes/electrolytes) is the wide range of both temporal and spatial scales encountered in the systems where these materials are produced, utilized or consumed. The challenge is to accurately account and bridge (as seamlessly as possible) the length and time scales involved in the problem. First, the problem is introduced using a biomass gasifier/pyrolyser, nuclear fuel coater, and a battery cell with sample results and provide an overview of the various models currently used at the different scales. In particular, the critical role of the heterogeneous interfacial processes in the overall performance of these systems will be highlighted. The ongoing development of a multiphysics and multiscale mathematics framework for coupling various modeling methods over a range of scales will be presented. The development of a general wavelet-based multiscale methodology called compound wavelet matrix (CWM) for bridging spatial and temporal scales will be reported. Finally, the steps needed to generalize the current methodology for arbitrary systems dealing with energy materials or other applications involving multiscale/multiphysics coupling will be elucidated. The challenges and opportunities of employing these models for rapid deployment of clean energy solutions to the market place will be discussed.
PROBABILITY SEMINAR
TIME: 3:35 – 4:35 p.m.
ROOM: HBB 132
SPEAKER: Professor Souvik Ghosh, Columbia University
TITLE: “A large deviation principle for a class of long range dependent infinitely divisible processes”
ABSTRACT: We make an attempt at understanding the effect of long range dependence on the large deviation principle for the partial sums of an infinitely divisible process. It has been observed in certain short memory processes that the large deviation principle is very similar to that of an i.i.d sequence. Whereas, if the process is long range dependent the large deviations change dramatically. We want to see if such a phenomenon holds for infinitely divisible processes.
Wednesday, October 28
ALGEBRA SEMINAR
TIME: 2:30 – 3:20 p.m.
ROOM: 1st Floor, Temple Court (in Math Tutorial Center)
SPEAKER: Mr. Jon Gray
TITLE: “(Co/Bi/Hopf-) Algebras”
ANALYSIS SEMINAR
TIME: 3:35 – 4:30 p.m.
ROOM: AC 113
SPEAKER: Professor Stefan Richter
TITLE: “Two-isometric operators and operator tuples on Hilbert spaces, II.”
GEOMETRIC ANALYSIS SEMINAR
(Optimal Transportation)
TIME: 4:30 – 5:30 p.m.
ROOM: HBB 102
SPEAKER: Professor Fernando Schwartz
TITLE: “Displacement interpolation and displacement convexity”
Chapter 5 of Villani’s 2003 textbook)
Thursday, October 29
JUNIOR COLLOQUIUM
TIME: 3:35 – 4:35 p.m.
ROOM: HBB 102
SPEAKER: Professor Suzanne Lenhart
TITLE: “The power of optimal control: from confining rabies to improving CPR”
ABSTRACT: This talk will present optimal control of two examples which are discrete in time. The first example involves difference equations that model cardiopulmonary resuscitation. The goal is to design an external chest amd abdomen pressure pattern to
improve the blood flow in the heart in standard CPR procedure. The second example is an epidemic model for rabies in raccoons on a spatial grid. The goal is to find the optimal distribution pattern for vaccine baits to slow the spread of the disease.
Free pizza @3:15
Friday, October 30
CHEMICAL & BIOLOGICAL ENGINEERING SEMINAR
TIME: 1:30 p.m.
ROOM: TBA
SPEAKER: Professor Tim Schulze
TITLE: "Kinetic Monte Carlo simulation of dendrites, diffusion limited aggregates
and quantum dots."
ABSTRACT: Unlike traditional equilibrium/thermodynamic Monte Carlo, kinetic
Monte Carlo (KMC) seeks to model non-equilibrium processes and simulate their stochastic evolution in time. The growth of defect-free epitaxial thin films is often studied by this
technique. In this talk, I will briefly review the basic concepts and present my most recent work on two enhanced KMC models that greatly extend the range of physical systems that can be studied. In the first model, we combine a KMC approach to front-tracking with a continuum model for heat transfer to study the growth of a dendrite or diffusion limited aggregate into an under-cooled melt. In the second model, we couple KMC simulations of film growth to a linear elastic model to simulate hetero-epitaxial growth of "quantum dots".
If you are interested in giving or arranging a talk for one of our seminars or colloquiums, please review our calendar.
If you have questions, or a date you would like to confirm, please contact Dr. Steve Wise.
Week of:
Past notices:
Seminars from 2008-2009 academic year
Seminars from 2007-2008 academic year
Seminars from 2006-2007 academic year