Tuesday, October 15, 2019 - 9:50am - 10:35am
Katie Bouman (California Institute of Technology)
This talk will present the methods and procedures used to produce the first image of a black hole from the computational Event Horizon Telescope. It has been theorized for decades that a black hole will leave a shadow on a background of hot gas. Taking a picture of this black hole shadow could help to address a number of important scientific questions, both on the nature of black holes and the validity of general relativity. Unfortunately, due to its small size, traditional imaging approaches require an Earth-sized radio telescope.
Wednesday, February 15, 2017 - 10:15am - 11:05am
Chris Xu (Cornell University)
Over the last two decades, multiphoton microscopy has created a renaissance in the brain imaging community. It has changed how we visualize neurons by providing high-resolution, non-invasive imaging capability deep within intact brain tissue. Multiphoton imaging will likely play an essential role in understanding how the brain works at the level of neural circuits, which will provide a bridge between microscopic interactions at the neuronal level and the complex computations performed at larger scales.
Tuesday, February 14, 2017 - 11:30am - 12:20pm
P. Scott Carney (University of Illinois at Urbana-Champaign)
Optical coherence tomography (OCT) provides an alternative to physical sectioning that allows for imaging of living samples and even in vivo examination of cell structure and dynamics. There is, in the OCT community, a widely held belief that there exists a trade-off between transverse resolution and the thickness of the volume that may be imaged with a fixed focal plane. Efforts to overcome this trade-off have focused on the design optical elements and imaging hardware.
Tuesday, February 14, 2017 - 10:15am - 11:05am
Remi Carminati (École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI))
Coherent light scattering by a disordered medium produces a speckle pattern whose statistical properties have been extensively studied. On the fundamental side, intensity fluctuations and correlations are basic ingredients in mesoscopic phenomena. On the applied side, they offer the possibility to design sensitive sensing and imaging techniques to probe complex media.
Wednesday, April 13, 2011 - 2:00pm - 3:00pm
Peter Kitanidis (Stanford University)
The subsurface is where most of the available freshwater is stored; in the United States, groundwater is the primary source of water for over 50 percent of Americans, and roughly 95 percent for those in rural areas. Cleaning up the surface from industrial and nuclear wastes is quite challenging. A major impediment in studying processes in the subsurface and in managing resources is that it is difficult to achieve accurate and reliable imaging, i.e., identification of properties, of geologic formations.
Wednesday, August 4, 2010 - 10:00am - 10:30am
Laurent Demanet (Massachusetts Institute of Technology)
The butterfly algorithm is a robust alternative to the FFT for
computing certain oscillatory integrals in a fast and accurate manner. In
this approach low-rank interactions are updated in a hierarchical fashion
up and down quadtrees. We review the method, its expected accuracy, and
present an application to synthetic aperture radar imaging. Joint work
with Lexing Ying.
Friday, June 4, 2010 - 9:15am - 9:30am
Eamonn Gaffney (University of Oxford)
Studying human spermotozoa motility is a subject of growing
importance due to human male subfertility and the fact that the
in-vitro fertilisation interventions that bypass normal sperm
motility are invasive and entail significant risk for the
healthy female partner, as well as being economically
prohibitive for many. We present examples of how fluid and
continuum dynamics can provide novel insights concerning the
mechanics of human spermatozoon behaviour, focussing on the
interpretation of recent high resolution imaging.
Tuesday, November 15, 2011 - 10:15am - 11:15am
Guillermo Sapiro (University of Minnesota, Twin Cities)
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