David Hanon

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Surface catalytic processes produce, under certain conditions, small clusters of adsorbed atoms or groups, called islands which, after they have been formed, move as individual entities. Here we consider the catalytic reduction of NO with hydrogen on platinum. (i) Using video field ion microscopy, we observe the dynamic motion of small hydroxyl islands on(More)
The coordination mechanism is an important aspect of the behaviour based approach. Many strategies are developed to select an action among the proposals of each behaviour. Distributed preference voting present many advantages compared to the other strategies. However, several disadvantages persist. Thus we propose an improvement of this method. The(More)
A periodic Kolmogorov type ̄ow is implemented in a lattice gas automaton. For given aspect ratios of the automaton universe and within a range of Reynolds number values, the averaged ̄ow evolves towards a stationary two-dimensional ABC type ̄ow. We show the analogy between the streamlines of the ̄ow in the automaton and the phase plane trajectories of a(More)
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