Deterministic chaos
The Fermi Paradox, Phase Changes and Intergalactic Colonisation
10:20 - 26.07.2010 — dwl
A new model shows how the spread of ET civilisations can undergo phase changes, providing a deeper insights into the Fermi Paradox.
In 1950, the Italian physicist Enrico Fermi raised the question that now bears his name. If there are intelligent civilisations elsewhere in the Universe with technologies that far surpass our own, why do we see no sign of them?
Chemistry Drives Convection
13:34 - 02.02.2010 — dwl
Stirring a mixture can accelerate chemical reactions between the ingredients, but less obvious is the reverse: reactions can stir up a mixture. As a demonstration of the chemistry "tail" wagging the fluid dynamics "dog," researchers have run several computer simulations and verified their model with a simple acid-base experiment. Described in the 29 January Physical Review Letters, the results explicitly show how common chemical reactions can induce fluid flows.
Dynamics of large networks
13:50 - 16.01.2010 — dwl
PhD Thesis Defense of Jure Leskovec,
Computer Science Department, Stanford University.
A basic premise behind the study of large networks is that interaction leads to complex collective behavior. In our work we found very interesting and counterintuitive patterns for time evolving networks, which change some of the basic assumptions that were made in the past.
Self-similarity properties in a queuing network model
13:13 - 12.01.2010 — dwl
In this paper a model of subscriber telephone network based on the concept of cellular automata is elaborated [1]. Some fractal properties inherent in the model are revealed that vary depending on parameters assigning its operation rules. The main advantage of the model in question is its compatibility with algorithmic methods - a finite set of formal rules, assigned on a finite set of elements (cells), allows precise realization in the form of algorithms.
