Applied Dynamics Archives for Academic Year 2014


"Advection-condensation of water vaopr in a model of coherent stiring" and "An energy-enstrophy method for nonlinear stability in two-dimensional hydrodynamics"

When: Thu, September 4, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Yue-Kin Tsang (University of Edinburgh) - http://www.maths.ed.ac.uk/~yktsang/


Connecting data with competing opinion models

When: Thu, September 18, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Keith Burghardt (UMD) -
Abstract: We introduce a contagion-like opinion model that includes dynamic resistance to alternative opinions. We show that this model can describe candidate vote distributions, spatial vote correlations, and slow opinion consensus with sensible parameter values. This may suggest that all these distinct behaviors, previously understood using distinct models, may in fact be different aspects of a unified description of human behavior, described by our new model.

Patlak-Keller-Segel and related models for collective motion of organisms

When: Thu, September 25, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Jacob Bedrossian (UMD) -


Inhibition guarantees ceaseless cortex dynamics

When: Thu, October 2, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Juan Restrepo (University of Colorado) - https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAA&url=http%3A%2F%2Famath.colorado.edu%2Ffaculty%2Fjuanga%2FJuan_G._Restrepo.html&ei=feERVJn8G5DbaJzugNgO&usg=AFQjCNGYg4DC8MbPSoyIlduPjcnHWdwsXg&sig2=v6Ephje-1W1O8Iu22MdQXw&bvm=bv.75097201,bs.1,d.bGQ


Statistical description of mixed systems (chaotic and regular)

When: Thu, October 9, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Shmuel Fishman (Technion) - http://physics.technion.ac.il/~fishman/


Dynamical transitions in large systems of mean field coupled oscillators

When: Thu, October 16, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Wai Lim Ku (UMD) -


The Role of Geometric Structures in Chaotic Phase Space -- Ionization and Chaos Induced Energy Hopping from Mathematical Perspective

When: Thu, October 23, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Korana Burke (UC-Davis) - csc.ucdavis.edu/~kburke/korana/Home.html
Abstract: Humans interact with chaotic systems on everyday basis. Chaos plays a fundamental role on a wide span of length and time scales. Since it is hard to isolate a chaotic system from random interactions with the environment, the challenges in studying its behavior are both mathematical and experimental. In recent years, atomic gasses have emerged as experimentally accessible systems for observing chaos under controlled conditions. In this talk I will present the study of geometric structures in phase space that govern the chaotic transport in an atomic system. I will show how these results apply to understanding the chaotic ionization in Rydberg atoms. Theoretical results are based on the study of a homoclinic tangle and its corresponding turnstile. Understanding the relationship between the turnstile and the system parameters allows us to draw conclusions about the ionization process and to design the experiments for probing the structure of the chaotic phase space. Finally, I will present a set of recent results which show that this approach can be used to design an experimental protocol for nonadiabatic energy change of an electron ensemble.

X-ray diffraction imaging of quantum vortices in superfluid He droplets

When: Thu, October 30, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Andrey Vilesov (USD, Dept of Chemistry) - http://www-bcf.usc.edu/~vilesov/People.html


Translating sonoluminescence to therapy for MRSA chronic wounds

When: Thu, December 4, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Seth Putterman (UCLA) -


Non-modal amplification and subcritical turbulence in a plasma

When: Thu, December 11, 2014 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Matt Landreman, UMD
Abstract: It is well established that certain fluid flows with no growing linear eigenmodes can still support turbulence. Here we discuss a related phenomenon in a plasma, related to drift waves driven by a density gradient. The hydrodynamic and plasma problems are different in that sheared equilibrium flow is not needed in the latter case, and the shearing of the magnetic field plays a role like viscosity. As in the hydrodynamic case, in the plasma problem there can be substantial transient linear growth before exponential decay. Generalizing an argument from hydrodynamics, we can prove that such transient linear growth is necessary for sustained nonlinear turbulence.

Noise, chaos and entropy production in a photon-counting experiment

When: Thu, February 12, 2015 - 12:30pm
Where: ERF 1207 - IREAP Conf Room
Speaker: Aaron Hagerstrom (University of Maryland) -
Abstract: TBA

Diffusion Forecast

When: Thu, February 19, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: John Harlim (Penn State University) - http://www.personal.psu.edu/jzh13/


High precision test of Landauer's principal in a feedback trap

When: Thu, February 26, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: John Bechhoefer (Simon Fraser University) - http://www.sfu.ca/chaos/


Modulation of complex collective behaviors in a network of theta neurons by synaptic diversity

When: Thu, March 12, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Peter So (Dept. of Physics, George Mason University) - http://complex.gmu.edu/people/paso/


Defining Chaos

When: Thu, March 26, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Brian Hunt (University of Maryland) - http://www.chaos.umd.edu/~bhunt/


Dynamics of Langmuir films: theory and experiment

When: Thu, April 2, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: James Alexander (University of Maryland) -


Colored noise in nucleation

When: Thu, April 9, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Evelyn Sander (Dept. of Mathematics, George Mason University) - http://math.gmu.edu/~sander/EvelynSite/index.html


Hierarchical transition chronometries in the human central nervous system

When: Thu, April 16, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Paul Papp (Uniform Services University of the Health Sciences (Bethesda, MD)) -


Using Group Theory to Find All Possible Synchronization Patterns in a Network of Oscillators

When: Thu, April 23, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Louis Pecora (Naval Research Laboratory) -


Effect of heterogeneous dynamics and structured communication on collective motions of delay-coupled swarms

When: Thu, April 30, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Klimka Szwaykowska (Naval Research Laboratory) -


Finite time Lyapunov exponents and gradient statistics in fluid turbulence

When: Thu, May 14, 2015 - 12:30pm
Where: IREAP Large Conference Room, ERF 1207
Speaker: Charles Meneveau (Johns Hopkins University) - http://pages.jh.edu/~cmeneve1/