Past Seminars- Colloquium

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  • Sijue Wu
    Fri Feb 6, 2015
    4:00 pm
    We consider the two-dimensional water wave problem in the case where the free interface of the fluid meets a vertical wall at a possibly non-trivial angle; our problem also covers interfaces with angled crests. We assume that the fluid is inviscid, incompressible, and irrotational, with no surface tension and with air density zero. We construct a...
  • Emmanuel Candes
    Thu Nov 6, 2014
    4:00 pm
    In many imaging problems such as X-ray crystallography, detectors can only record the intensity or magnitude of a diffracted wave as opposed to measuring its phase.  Phase retrieval concerns the recovery of an image from such phaseless information.  Although this problem is in general combinatorially hard, it is of great importance...
  • Mathias Fink
    Thu Oct 30, 2014
    3:30 pm
    The origin of diffraction limit in wave physics, and the way to overcome it, can be revisited using the time-reversal mirror concept. According to time-reversal symmetry, a broadband wave can be focused both in time and space regardless of the complexity of a scattering medium. In a complex environment a time-reversal mirror acts as an antenna...
  • Herbert Amann
    Thu Oct 23, 2014
    4:00 pm
  • Frank Bauerle and Tony Tromba
    Thu Oct 16, 2014
    4:00 pm
    Frank Bäuerle and Tony Tromba from UC Santa Cruz, will describe UC's Calculus Online, now available to all UC students through our new cross campus enrollment system as well as to all non matriculated students including foreign nationals. Calculus I for Science and Engineering Students has been successfully running for over a year and...
  • Peter Polacik
    Thu May 8, 2014
    4:00 pm
    Unlike their counterparts on bounded domains, semilinear heat equations on $R^N$ admit bounded solutions with very diverse large-time behavior. I will first present several examples of solutions with interesting and sometimes entertaining behavior in compact regions. Then I will discuss a few general results describing the behavior of more...
  • Barry Simon
    Thu May 1, 2014
    4:00 pm
    This is not a mathematics talk but it is a talk for mathematicians. Too often, we think of historical mathematicians as only names assigned to theorems. With vignettes and anecdotes, I'll convince you they were also human beings and that, as the Chinese say,"May you live in interesting times" really is a curse.