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Events on Tuesday, April 6th, 2010

Chaos & Complex Systems Seminar
Running Form Modification: When Self-selected is not Preferred
Time: 12:05 pm
Place: 4274 Chamberlin Hall
Speaker: Bryan Heiderscheit, UW-Madison, Dept. of Orthopedics and Rehabilitation
Abstract: While it is generally well accepted that an individual's patten of running is optimized to conserve metabolic energy, at times, this self-selection process may increase injury risk. That is, the selected pattern may be one that increases local joint loading and the potential for repetitive microtraumatic injury. This is most evident in those just beginning to run as part of a regular exercise program. Using research and patient care findings, I will discuss how a simple modification to one's running gait can be an effective component to the treatment and prevention of common running-related injuries.

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Astronomy Colloquium
Sponsored by WOWSAP (Women of WI Strengthening Astronomy and Physics"
Probing the Inner and Outer Milky Way
Time: 3:30 pm - 5:00 pm
Place: 3425 Sterling Hall
Speaker: Juna Kollmeier, Carnegie Observatories
Abstract: The Milky Way provides an opportunity for a close-up investigation of the complex processes of galaxy and star formation. I will discuss recent efforts to do this by using rare, but important, probes of these phenomena. In the first portion of the talk I will present results on hypervelocity stars primarily from the Sloan Digital Sky Survey. The distribution of these stars, in physical properties and in space, allows us to place interesting limits on star formation and dynamics at the Galactic Center as well as the possibility to constrain the shape of the Milky Way's dark matter halo. I will discuss progress we have made toward these goals. In the second portion of the talk, I will discuss how one can use RR Lyrae stars to probe the outer halo of the Milky Way and find new and distant substructures that are difficult to probe by other means. Our recent confirmation of a distant structure in RR Lyrae stars highlights the power of this approach to unraveling the outer halo and showcases exciting possibilities for future all-sky time-domain surveys.
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