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SEQUENCE:0
UID:UW-Physics-Event-3671
DTSTART:20150424T203000Z
DTEND:20150424T213000Z
DTSTAMP:20260419T102639Z
LAST-MODIFIED:20150325T140147Z
LOCATION:2241 Chamberlin Hall (coffee at 4:30 pm)
SUMMARY:Universal quake statistics: from nanopillars to earthquakes\, 
 Physics Department Colloquium\, Karin Dahmen\, University of Illinois
DESCRIPTION:The deformation of many solid materials is not continuous\
 , but discrete\, with intermittent slips similar to earthquakes. Here\
 , we suggest that the statistical distributions of the slips\, such as
  the slip-size distributions\, reflect tuned criticality\, with approx
 imately the same regular (power-law) functions\, and the same tunable 
 exponential cutoffs\, for systems spanning 13 decades in length\, from
  tens of nanometers to hundreds of kilometers\; for compressed nano-cr
 ystals\, to amorphous materials\, ]to earthquakes. The similarities ar
 e explained by a simple analytic model\, which suggests that results a
 re transferable across scales. This study provides a unified understan
 ding of fundamental properties of shear-induced deformation in systems
  ranging from nanocrystals to earthquakes. It also provides many new p
 redictions for future experiments and simulations. The studies draw on
  methods from the theory of phase transitions\, the renormalization gr
 oup\, and numerical simulations. Connections to other systems with ava
 lanches\, such as magnets and neuron firing avalanches in the brain ar
 e also discussed.
URL:https://www.physics.wisc.edu/events/?id=3671
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