Brown University
Joint Materials/Solid Mechanics Seminar Series
Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208-3111 | |
Abstract: Over the past decade, there has been a substantial thrust to reduce the size of electronic and electromechanical systems to the nanoscale by fabricating devices out of thin films, carbon nanotubes (CNTs) and nanowires (NWs). In these applications, a thorough understanding of material, mechanical, electrical and thermal properties as well as device performance and reliability requires the development of novel experimental approaches. In this seminar, two such experimental methodologies will be introduced and discussed. The first one addresses the development of MEMS devices for in-situ electron microscopy mechanical testing of thin films and one dimensional (1-D) nanostructures. The design, microfabrication and operation of a MEMS-based nanoscale material testing system (n-MTS) will be presented. Results obtained from in-situ SEM and TEM tensile testing of NWs and CNTs will be discussed. The second experimental methodology addresses the in-situ SEM testing of NEMS to assess device electro-mechanical performance (pull-in voltage, I-V curves, and time response) and reliability. A carbon nanotube NEMS bistable switch with feedback control, developed in our lab, will be used to demonstrate the method and highlight present and future research challenges.
Brown Analysis Seminar
Scientific Computing Seminar
Rutgers University, New Brunswick, NJ | |
Abstract: The spectral element method offers distinct advantages for ocean and climate modeling. Its main advantages are geometric flexibility inherent in their computational grids, good scalability characteristics on present day parallel computers; and dual h-p paths to convergence.
We start by reviewing existing ocean models and outline major challenges in the ocean modeling community. We then present the spectral element formulation for the oceanic equations, and describe our recent achievements in developing a Spectral Finite Element Ocean Model and a Spectral Finite Volume Ocean Model, including the implementation of Discontinuous Galerkin method and development of the inverse model. Finally, we present some results for both process-oriented and realistic simulations obtained with our models.
Department of Mathematics Colloquium
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