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Events for January 10, 2007
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Measuring Strain in the Carotid Arteries using DENSE MRI
Wed, Jan 10, 2007 @ 11:00 AM - 12:00 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Abstract:
The wall of major arteries undergoes cyclic stretching from the loading of the pulsatile arterial pressure. Atherosclerotic lesions have been shown to localize to regions of excessive stretching of the arterial wall. We developed a displacement-encoded MRI (DENSE) sequence for imaging the motion of the carotid artery wall and mapping the 2D circumferential strain in wall. The sequence utilizes a fully-balanced SSFP readout and achieves 0.6 mm in-plane resolution. Preliminary results in volunteers at 1.5 T and 3.0T support the validity of DENSE mapping of pulsatile strain in the carotid artery wall.
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Talyia Veal
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Sprawl: A Compact History
Wed, Jan 10, 2007 @ 12:00 PM - 01:30 PM
Daniel J. Epstein Department of Industrial and Systems Engineering
University Calendar
METRANS Seminar - Seminars are held on Wednesdays, over the lunch hour, in Lewis Hall. Bring your lunch if you like. Robert BruegmannProfessor of Art History, Architecture and Urban Planning, University of Illinois at ChicagoWednesday, January 10, 2007,
12:00pm - 1:30pm,
Lewis Hall (RGL)Room 215Abstract: Most "right-minded" individuals today seem to believe that urban sprawl is a post-World War II American phenomenon and one largely driven by a rising tide of automobile use. They also believe that economically, socially, environmentally and aesthetically it is bad and must be stopped. Robert Bruegmann argues that sprawl is actually as old as cities and has flourished whenever affluence has allowed a new class of people to move outward from the central city. He further argues that the complaints about sprawl are greatly over-rated and the benefits of sprawl largely neglected. Finally, he says, attempts to stop sprawl as often as not have either been ineffective or have produced unintended consequences worse than the sprawl itself. A good example can be found in campaigns in affluent cities of the Western World to push up urban densities to the point where significant numbers of people will abandon their automobiles and use rail transport.
This kind of policy is hinderi ng efforts to increase mobility, particularly for the least affluent members of society.Biography:Robert Bruegmann is an historian of architecture, landscape and the built environment.He received his BA from Principia College in 1970 and his Ph.D. from the University of Pennsylvania in 1976 with a dissertation on late 18th and early 19th century European hospitals and other institutions. In 1977 he became assistant professor in the Art History Department at the University of Illinois at Chicago where he is currently Professor and Chair of the department with appointments in the School of Architecture and the Program in Urban Planning and Policy. He has also taught at the University of Pennsylvania, Philadelphia College of the Arts, MIT and Columbia University.
He has also worked for the Historic American Buildings Survey and Historic American Engineering Record of the National Park Service.His fields of research and teaching are architectural, urban, landscape, and planning history and historic preservation. He has received scholarships and fellowships from the National Endowment for the Humanities, the Graham Foundation, the Buell Center for the Study of American Architecture at Columbia University and the Institute for the Humanities and the Great Cities Institute at the University of Illinois at Chicagohttp://www.robertbruegmann.com/*******For more information, please contact Hossein Ataei (ataei@usc.edu).
Location: Ralph And Goldy Lewis Hall (RGL) - 215
Audiences: Everyone Is Invited
Contact: Georgia Lum
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Walk-In Wednesdays: Career Services Advising
Wed, Jan 10, 2007 @ 02:00 PM - 04:00 PM
Viterbi School of Engineering Career Connections
Student Activity
Please feel free to come in during these walk-in hours! No appointment is necessary. Come in for resume reviews, internship information, or general engineering career advice.
Location: Ronald Tutor Hall of Engineering (RTH) - 218
Audiences: Current Engineering Students
Contact: RTH 218 Viterbi Career Services
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Stress-Induced Martensitic Phase Transformation and Fracture
Wed, Jan 10, 2007 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Samantha DalyCalifornia Institute of TechnologyAbstractNickel-Titanium, commonly referred to as nitinol, is a shape-memory alloy with numerous applications due to its superelastic nature and its ability to revert to a previously defined shape when deformed and then heated past a set transformation temperature. While the crystallography and the overall phenomenology are reasonably well understood, much remains unknown about the deformation and failure mechanisms of these materials. These latter issues are becoming critically important as nitinol is being increasingly used in medical devices and space applications. The talk will describe the investigation of the deformation and failure of nitinol using an in-situ optical technique called Digital Image Correlation (DIC). With this technique, full-field quantitative maps of strain localization are obtained for the first time in thin sheets of nitinol under tension. These experiments provide new information connecting previous observations on the micro- and macro- scale. They show that martensitic transformation initiates before the formation of localized bands, and that the strain inside the bands does not saturate when the bands nucleate. The effect of rolling texture, the validity of the widely used resolved stress transformation criterion, and the role of geometric defects are examined. A detailed investigation of fracture will be presented, including the observed saturation and transformation zones around the cracktip, as well as a determination of the K_IC value for thin sheets of nitinol. A discussion of these results in the context of theoretical models will be provided.
Location: Seaver Science Library (SSL), Rm 150
Audiences: Everyone Is Invited
Contact: April Mundy
