[Todos] Coloquios del Departamento de Física (hoy jueves 19/4, 14hs)

[pdmitruk en df.uba.ar]

Recordamos el coloquio de hoy, NOTAR CAMBIO DE AULA:

  COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEYN - UBA

http://coloquios.df.uba.ar/

  Charlas, café y galletitas

  En el Aula Seminario, 2do piso, Pabellón I, Ciudad Universitaria

  Jueves 19/4, 14hs:

  DYNAMICS OF COMPLEX SYSTEMS, CRITICALITY AND RECORD DYNAMICS

  HENRIK JELDTOFT JENSEN

  Imperial College London

  The paradigm of Self-Organised Criticality emphasises systems in a
  stationary state created by the action of a slow external constant
driving
  rate. SOC postulates that the driven system self-organises to a critical
  state. In the critical state the system is expected to exhibit abrupt
  releases of energy in the form of macroscopic events termed avalanches.
The
  focus is on the probability distributions of the even sizes, which are
  presumed to be scale free power laws in the limit of infinite system
size.
  Candidates for SOC are e.g. earthquakes, rain, forest fires and many
  others. The scenario of Record Dynamics is concerned with non-stationary
  and non-critical complex systems undergoing relaxation in order to
release
  a (generalised) internal strain induced at the moment of preparation. The
  rate of activity decreases as one over time and the distribution of event
  times follows a Poisson process in logarithmic time. The events sizes can
  follow any distribution. Systems, which appear to follow the log-Poisson,
  include spin-glasses, over damped relaxing particle models, models of
long
  time macroevolution and experiments on dynamics of ant colonies. 
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