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DTSTART:20070311T020000
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DTSTAMP:20261030T151510
DTSTART;TZID=America/Detroit:20261104T160000
DTEND;TZID=America/Detroit:20261104T172000
SUMMARY:Workshop / Seminar:RTG SEMINAR Topology\, Geometry\, Dynamics:   Dense subgroups of compact groups: two vignettes.
DESCRIPTION:I will talk about two loosely related results about\ndense subgroups of compact groups\, one with Sven Sandfeldt\,\nthe other with Michael Larsen.  The first concerns local rigidity\nof group actions\, the second spectral gaps.  I hope to explain\nsome questions that arise in this context and invite people\nto think about them.
UID:149233-21906024@events.umich.edu
URL:https://events.umich.edu/event/149233
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Mathematics
LOCATION:East Hall - 3860
CONTACT:
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DTSTAMP:20261101T234129
DTSTART;TZID=America/Detroit:20261104T160000
DTEND;TZID=America/Detroit:20261104T170000
SUMMARY:Workshop / Seminar:Student AIM Seminar: Instrument-Aware Diffusion for Solar Magnetogram Reconstruction
DESCRIPTION:Historical scientific archives often contain observations of lasting value that were acquired with lower-resolution instruments than those available today. Solar magnetograms provide a motivating example: the Michelson Doppler Imager (MDI) aboard the Solar and Heliospheric Observatory (SOHO) recorded decades of solar activity before the higher-resolution Helioseismic and Magnetic Imager (HMI) became available. We develop a generative framework that first learns how modern observations are transformed by an older instrument\, uses this transformation to construct paired training data\, and then trains a conditional diffusion model to reverse the loss of resolution. A scalable multiscale U-Net and DPM++ sampler generate multiple modern-quality reconstructions from each historical observation. More broadly\, this provides a general strategy for connecting scientific archives across generations of instruments.
UID:154402-21917657@events.umich.edu
URL:https://events.umich.edu/event/154402
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Applied Mathematics
LOCATION:East Hall - 3088
CONTACT:
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