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Events for November 28, 2007
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Evaluating and Negotiating Job Offers
Wed, Nov 28, 2007 @ 12:00 PM - 01:00 PM
Viterbi School of Engineering Career Connections
Workshops & Infosessions
Decision Time! How do you decipher and evaluate job offers? How do you begin the negotiations phase? Attend this workshop and learn helpful tips that will help guide you through the process.
Location: Ronald Tutor Hall of Engineering (RTH) - 109
Audiences: All Viterbi Students
Contact: RTH 218 Viterbi Career Services
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A Partition of Unity Finite Element Method for Cohesive Zone Modeling of Fracture
Wed, Nov 28, 2007 @ 02:00 PM - 03:00 PM
Sonny Astani Department of Civil and Environmental Engineering
Conferences, Lectures, & Seminars
Speaker: James V. Cox,
Advanced Mechanics Development Department,
Sandia National Laboratories,
Albuquerque, New MexicoAbstract:Meaningful computational investigations of many solid mechanics problems require accurate characterization of material behavior through failure. A recent approach to fracture modeling has combined the partition of unity finite element method (PUFEM) with cohesive zone models. In the PUFEM, the displacement field is enriched to improve the local approximation. Previous studies have used simplified enrichment functions to represent the strong discontinuity but have lacked an analytical basis to represent the displacement gradients in the vicinity of the cohesive crack. In this study enrichment functions based upon two existing analytical investigations of the cohesive crack problem are proposed. These functions have the potential of representing displacement gradients in the vicinity of the cohesive crack with a relatively coarse mesh and allow the crack to incrementally advance across each element. An overview of the enrichment functions and key aspects of the numerical implementation are presented. Analysis results for simple model problems are presented to evaluate if quasi-static crack propagation can be accurately followed with the proposed formulation. A standard finite element solution with interface elements is used to provide the accurate reference solution, so the model problems are limited to a straight, mode I crack in plane stress. Except for the cohesive zone, the material model for the problems is homogenous, isotropic linear elasticity. Propagation of the cohesive zone tip and crack tip, time variation of the cohesive zone length, and crack profiles are examined to assess the potential of this PUFEM. The effects of mesh refinement and mesh orientation on the results are also considered. The analysis results indicate that the enrichment functions based upon the asymptotic solutions can accurately track the cohesive crack propagation independent of mesh orientation. Extension of the formulation to mixed mode cracking and applicability of the enrichment functions to problems with inelastic domains are the subjects of ongoing studies.Location: Kaprielian Hall (KAP) - rielian Hall 209
Audiences: Everyone Is Invited
Contact: Evangeline Reyes
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VRPSYCH Laboratory for Virtual Reality, Psychology, Rehabilitation, and Social Neuroscience
Wed, Nov 28, 2007 @ 03:30 PM - 04:30 PM
Daniel J. Epstein Department of Industrial and Systems Engineering
University Calendar
DANIEL J. EPSTEIN DEPARTMENT OF INDUSTRIAL AND SYSTEMS ENGINEERING ISE 650 SEMINAR:"VRPSYCH Laboratory for Virtual Reality, Psychology, Rehabilitation, and Social Neuroscience"Dr. Thomas D. ParsonsResearch Scientist, Neuropsychologist, Co-Director VRPSYCH Lab, USC Institute for Creative Technologies, Marina del Rey, CAABSTRACT: Thomas D. Parsons, PhD will be presenting on the VRPSYCH Laboratory for Virtual Reality, Psychology, Rehabilitation, and Social Neuroscience at the University of Southern California's Institute for Creative Technologies. The VRPSYCH Lab is engaged in a broad program of research on the brain mechanisms that underlie neurocognitive functioning and emotion regulation in persons throughout the life course. We make use of virtual environments to study associations between the essential neural correlates of cognitive functioning and emotion regulation to assess the mechanisms of brain-behavior relations. In particular we investigate frontal subcortical circuits that underlie neurocognitive functioning and emotion regulation in persons throughout the life course. Included among the disorders we have recently studied are mood and anxiety disorders (PTSD), stroke, mild traumatic brain injury, ADHD, autism, Alzheimer's, and pain distraction.Thomas D. Parsons, PhD is a Clinical and Experimental Neuropsychologist, and Research Scientist at the University of Southern California's Institute for Creative Technologies. Dr. Parsons was recruited to the University of Southern California in 2006 by the Institute for Creative Technologies. Prior to coming to ICT, Dr. Parsons was in the Neurology Department at University of North Carolina Chapel Hill's Medical School, where he conducted research on the frontostriatal system and the cognitive sequelae of deep brain stimulation. He currently codirects the VRPSYCH Laboratory with his longtime collaborator, Dr. Skip Rizzo, helping to facilitate research integrating Virtual & Augmented Reality, Psychology, Rehabilitation, and Social Neuroscience.Dr. Parsons can be reached by e-mail: tparsons@usc.edu, Tel: (310) 574-1632.Wednesday, November 28, 2007, 3:30 - 4:30 PM, GER 309
Location: Ethel Percy Andrus Gerontology Center (GER) - 309
Audiences: Everyone Is Invited
Contact: Georgia Lum
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Global Modes and Aerodynamic Sound Generation In Self-Excited Hot Jets
Wed, Nov 28, 2007 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Lutz Lesshafft Postdoctoral Fellow University of California at Santa Barbara Santa Barbara, CA One of the most remarkable phenomena in the field of aerodynamic instability is the spontaneous bifurcation of a steady flow towards a selforganized state of intrinsic oscillations. Similar to the von Kármán vortex street in cylinder wakes, hot jets constitute another class of such globally unstable flows: whereas an isothermal jet behaves as an amplifier of external perturbations, sufficiently heated jets display intrinsic oscillations in the form of regularly spaced ring vortices. Comparison of direct numerical simulation results to theoretical predictions, derived from Ginzburg-Landau model equations, demonstrates that these self-sustained oscillations in subsonic hot jets are dominated by the dynamics of a nonlinear wave front, which separates an oscillating flow region from the upstream steady flow. The bifurcation towards a state of self-sustained synchronized oscillations ('nonlinear global mode') is due to the existence of an absolutely unstable region in the underlying base flow. A linear stability analysis allows us to predict the naturally selected frequency, as well as the critical temperature ratio for the onset of global instability. Both the near- and the far-field of the jet are resolved via DNS: the acoustic field generated by such a synchronized vortex street is found to be that of a compact dipole, with maximum acoustic intensity in the axial direction of the jet. A numerical analysis of the Lighthill equation reveals that this radiation pattern is due to strong entropy fluctuations within the jet.
Location: Stauffer Science Lecture Hall, Rm 102
Audiences: Everyone Is Invited
Contact: April Mundy
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KIUEL Leadership Series: Marketing Your Leadership Experience
Wed, Nov 28, 2007 @ 05:00 PM - 06:00 PM
Viterbi School of Engineering Student Affairs
Workshops & Infosessions
Join Viterbi Career Services (VCS) as they teach you how to best market your leadership experiences for potential internship and full-time employment. Learn about ways to highlight your leadership even if you haven't held a formal position. They will talk about networking, resumes and overall experiences you should be sure to highlight! For more information, please visit http://viterbi.usc.edu/kiuel/.
Location: Ronald Tutor Hall of Engineering (RTH) - 211
Audiences: Viterbi Undergraduates
Contact: Tisha Armatys
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Symantec Information Session
Wed, Nov 28, 2007 @ 05:30 PM - 07:00 PM
Viterbi School of Engineering Career Connections
Workshops & Infosessions
Join representatives of this company as they share general company information and available opportunities.
Location: Seeley G. Mudd (SGM) 124
Audiences: All Viterbi Students
Contact: RTH 218 Viterbi Career Services
