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Recent Work

It is only in recent years that the scientific community has focused significant resources in understanding the complexity of non-linear, distributed systems involving many interacting components. While the toolbox of methods for dealing with such systems is still relatively small, tools have been developed that provide useful qualitative characterizations of the behavior of non-linear dynamical systems. Over the last thirty years advances in the theory of nonlinear dynamics have made possible the qualitative analysis of nonlinear models involving finitely many dimensions. Many of the concepts that have emerged with the development of these tools are now well-known in nonlinear science, and include chaos, strange attractors, fractals, and scaling

More recently, an emerging focus has been on methods for characterizing the qualitative behavior of high- and infinite-dimensional non-linear systems. These developments promise to put within our reach the qualitative analysis of more realistic models of the complex phenomena of interest to scientists. The power of these methods resides, in part, in the realization that the qualitative behavior of many classes of complex systems is insensitive to differences in the details of their underlying mechanisms and processes. Many apparently "different" systems exhibit qualitively similar (universality classes) of behaviours.

The purpose of the Center of Nonlinear Science (CNLS) is to make these techniques available and demonstrate to researcher in nonlinear science that, when used in conjunction with more traditional tools, these emerging methodologies are capable of providing relatively "complete" characterizations of important classes of nonlinear phenomena.

There are 22 publications in this collection, published between 2004 and 2015.

Birnir, Bjorn; Chen, Xi; Can, Liu: Moments and Probability Density Functions in Turbulent Boundary Layers, 2015

Birnir, Bjorn: The Kolmogorov-Obukhov-She-Leveque Scaling in Turbulence, 2013

Birnir, Bjorn: The KOSL Scaling, Invariant Measure and PDF of Turbulence, 2013

Birnir, Bjorn: The Kolmogorov-Obukhov Statistical Theory of Turbulence, 2012

Einarsson , Baldvin; Birnir, Bjorn; Bonilla, Luis L.: Ordered, Disordered and Partially Synchronized Schools of Fish, 2012

Birnir, Bjorn; Rowlett, Julie: Erosion and Optimal Transport, 2010

Einarsson, Baldvin; Birnir, Bjorn; Sigurðsson, Sven Þ.: A Dynamic Energy Budget (DEB) model for the energy usage and reproduction of the Icelandic capelin (Mallotus villosus), 2010

Erickson, Brittany; Birnir, Bjorn; Lavallée, Daniel: Periodicity, Chaos and Localization in a Burridge-Knopoff Model of an Earthquake with Dieterich-Ruina Friction, 2010

Birnir, Bjorn: Approximation of the Invariant Measure for the Stochastic Navier-Stokes, 2009

Barbaro, Alethea; Taylor, Kirk; Trethewey, Peterson F; Youseff, Lamia; Birnir, Bjorn: Discrete and continuous models of the dynamics of pelagic fish: application to the capelin, 2008

Barbaro, Alethea B. T.; Einarsson, Baldvin; Birnir, Bjorn; Sigurðsson, Sven Þ.; Valdimarsson, Héðinn; Pálsson, Ólafur K. et al.: Modeling and Simulations of the Spawning Migration of Pelagic Fish, 2008

Birnir, Bjorn: The Existence and Uniqueness of Turbulent Solutions of the Stochastic Navier-Stokes Equation, 2008

Birnir, Bjorn; Mertens, Keith; Putkaradze, Vakhtang; Vorobieff, Peter: Meanderings of fluid streams on acrylic surfaces, driven by external noise, 2008

Birnir, Bjorn: Turbulent Rivers, 2008

Hendrata, Melisa; Birnir, Bjorn: The Dynamics of Myxobacteria Life Cycle, 2008

Youseff, Lamia; Barbaro, Alethea; Trethewey, Peterson F; Birnir, Bjorn; Gilbert, J R: Parallel Modeling of Fish Interactions, 2008

Birnir, Bjorn; Hou, Songming; Wellander, Niklas: Derivation of the Viscous Moore-Greitzer Equation for Aeroengine Flow, 2007

Birnir, Bjorn: An ODE Model of the Motion of Pelagic Fish, 2007

Birnir, Bjorn: Turbulence of a Unidirectional Flow, 2007

Erickson, Brittany; Birnir, Bjorn; Lavallée, Daniel: A Model for Aperiodicity in Earthquakes, 2007

Welsh, Edward; Birnir, Bjorn; Bertozzi, Andrea L.: Shocks in the Evolution of an Eroding Channel, 2006

Birnir, Bjorn; Hernandez, Jorge; Smith, Terence R: The Stochastic Theory of Fluvial Landsurfaces, 2004

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