Conferences, Lectures, & Seminars
Events for January
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Spectral Theory for Nonlinear Dynamical Systems
Mon, Jan 23, 2006 @ 11:00 AM - 11:50 AM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker:Prof. Igor MezicDepartment of Mechanical Engineering
University of California, Santa Barbara
Santa Barbara, CAAbsractNonlinear dynamical systems theory relies mainly on geometric tools of the type first employed by Poincare. In this talk we show how a lifting (representation) of the action of a nonlinear dynamical system to a linear, Koopman operator action on an infinite-dimesional Hilbert space of observables leads to methods of analysis of nonlinear dynamical systems in spectral terms. This theory, that relies on tools developed originally by Wiener, von Neumann and Koopman, is used to address questions of model validation and model reduction for high-dimensional, nonlinear systems. Much use is made of linking geometric concepts such as attractors and stable and unstable manifolds to spectral properties of the Koopman operator. When an adjoint (Perron-Frobenius) lifting is used, problems related to uncertainty propagation can be treated. For high-dimensional systems, graph theory methods are used in conjunction with the Perron-Frobenius lifting to address those.
Location: Kaprielian Hall (KAP) - 203
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Coupled Flow and Transport in Saturated Porous Media: Emphasis on Filtration Process and Application
Tue, Jan 24, 2006 @ 12:00 PM - 12:50 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker:Olivier ChupinLocation: Kaprielian Hall (KAP) - 203
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Hydrogen – The Step in Air Quality Improvement is a key statement or slogan in the California Hydr
Fri, Jan 27, 2006 @ 01:00 PM - 02:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Title: Hyrdogen- The Step in Air Quality Improvement" is a key statement or slogan in the California Hydrogen Highway ProgramSpeaker: Durai-Swamy, Ph.D., P.E.Director, Research and Development
energy.com
Intelligent Energy Inc.
Long Beach, CAAbstractOne of the most valuable attributes of hydrogen is that it can be produced by a myriad of production pathways, i.e., hydrogen can be produced from such pathways as natural gas steam reformation, electrolysis and biomass, and can then either be used on-site or distributed to other locations. While all production pathways provide energy diversity benefits, there are differences in the greenhouse gas (GHG) criteria, and toxic pollutant emissions and differences in the amount of petroleum displaced for each pathway.To ensure that the CA H2 Net results in environmental benefits spanning all pollutants the Societal Benefits Topic Team recommended the following goals for the CA H2 Net. These goals are based on Scenarios A, B, and C as described in the Blueprint Plan:1. The CA H2 Net should provide, in the aggregate, a 30 percent reduction in GHG emissions relative to conventional gasoline and diesel vehicles.Source: http://www.hydrogenhighway.ca.gov/plan/reports/sbreport.pdf During this presentation, we will explore the different aspects of the potential of the hydrogen economy - whether it is a hype or hope.
Location: Kaprielian Hall (KAP) - 156
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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Multi-scale Computational Methods and Application to Modeling of DNA Molecules
Mon, Jan 30, 2006 @ 11:00 AM - 11:50 AM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker:Prof. J.S. Chen
Department of Civil Engineering
University of California Los AngelesMonday, January 30, 2006 In this presentation, multi-scale computational methods originally developed for computational mechanics will be introduced first. In particular, the "reproducing kernel" and the "wavelet" based multi-scale numerical techniques for solving problems ranging from continuum to quantum scales will be reviewed, and methods for bridging physics in different scales will be given. The extension of multi-scale computational methods to the development of coarse graining technique for modeling DNA molecules will then be presented. The fine-scale molecule simulation of a segment of DNA has been performed. A wavelet based coarse graining approach for modeling DNA molecular structures has been introduced based on the Henderson's theorem. From the fine-scale atomistic simulation results, the distribution functions between centers of mass of two groups of atoms were obtained, and correspondingly the effective potential at fine-scale level was calculated. These fine-scale effective potentials were then homogenized using the multi-scale wavelet projection to yield the coarse-scale potentials between superatoms. These coarse-scale effective potentials were then used to parameterize the force field of the coarse-grained model.Location: Kaprielian Hall (KAP) - 203
Audiences: Everyone Is Invited
Contact: Evangeline Reyes