Conferences, Lectures, & Seminars
Events for September
-
AME Seminar
Wed, Sep 08, 2010 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Claire Tomlin, Professor, Electrical Engineering and Computer Sciences, University of California at Berkeley
Talk Title: Verification and Control of Hybrid Systems with Application to Multiple Coordinating UAVs
Abstract: This talk will present reachability analysis as a tool for model checking and controller synthesis for hybrid systems. We consider the problem of guaranteeing reachability to a given desired subset of the state space, allowing for nonlinear dynamics in each discrete mode, and possibly non-convex state constraints. Techniques from hybrid system verification are presented and used to compute reachable sets, under bounded model disturbances that vary continuously, as well as under the effects of sampling and quantization. The resulting control policy is an explicit feedback law involving both a selection of continuous inputs and discrete switching commands at each time instant, based upon measurement of system state. We discuss real time implementations of this, and present several examples using our UAV testbeds as well as Boeing aircraft.
Host: Dr. G. Spedding
More Info: http://ame-www.usc.edu/seminars/9-8-10-tomlin.shtmlLocation: John Stauffer Science Lecture Hall (SLH) - 100
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/9-8-10-tomlin.shtml
-
AME Seminar
Wed, Sep 22, 2010 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Suneel Kodambaka, Assistant Professor, Materials Science and Engineering, University of California at Los Angeles
Talk Title: In situ Microscopy and Spectroscopy Studies of Epitaxial Graphene on Metal Surfaces
Abstract:
The recent discovery of two-dimensional (2D) graphene crystals has generated a lot of attention owing to its potential for applications in high-performance, low-power, electronics and as transparent conductors. Recent efforts focused on, and succeeded in, the fabrication of large-area graphene on a variety of substrates, an encouraging step toward realization of graphene-based devices. Yet, relatively little is known concerning the mechanisms underlying the growth of graphene and the role of substrate-graphene interactions on its electronic properties. As a first step, we focused on the development of an atomic-scale understanding of the growth and electronic structure of graphene on model metals such as Pd and Ni.
Using scanning tunneling microscopy and spectroscopy (STM and STS), in combination with density functional theory (DFT), we investigated the morphology and electronic structure of monolayer graphene grown on Pd(111) and on 3D facetted Ni islands. On Pd(111), we observe the formation of monolayer graphene islands, 200-2000 à in size, bounded by Pd surface steps. Surprisingly, we found that graphene islands, as large as 2000 à , are semiconducting with a bandgap of 0.3 eV. For graphene on Ni, we observed hexagonal and stripe moiré patterns with periodicities of 22 à and 12 à , respectively, on (111) and (110) facets of the islands. Graphene domains are also observed to grow, as single crystals, across adjacent facets and over facet boundaries. STS data indicate that the graphene layers are metallic on both Ni(111) and Ni(110). DFT calculations support all of our observations and indicate the presence of strong interactions between carbon and metal atoms. Our results suggest that electronic properties of epitaxial graphene can be tailored by the appropriate choice of substrate and the possibility of preparing large-area epitaxial graphene layers even on polycrystalline surfaces.
Host: Dr. A. Hodge
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: John Stauffer Science Lecture Hall (SLH) - 100
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming
-
AME Seminar
Wed, Sep 29, 2010 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. David Cesario, Assoc. Prof. of Medicine, Cardiac Electrophysiology, Keck School of Medicine, USC
Talk Title: Engineering in Cardiac Electrophysiology
Abstract: Cardiac electrophysiology is a field with tremendous interaction between engineering and medicine. On a daily basis we use tools such as implantable pacemakers to improve patient's lives by increasing their heart rates. We also place implantable cardioverter defibrillators that have the potential to rescue patients from life threatening arrhythmias. Additionally, we use tools to map abnormal heart rhythms to their exact location within the heart and then to ablate the abnormal cardiac arrhythmias, potentially curing these arrhythmias. The goal of this talk is to expose students to some of the engineering technology that is used in cardiac electrophysiology to better patients lives and improve their health.
Host: Dr. F. Browand
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: John Stauffer Science Lecture Hall (SLH) - 100
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming