naXys Newsletter – May 2018
Newsletter – May 2018
- Feedback induced stationary and oscillatory patterns in complex bistable networks, Nikos Kouvaris (UNamur), May 15, 13:00 – 14:00, E25
- Regular school closure & influenza epidemics: a data-driven spatial transmission model for Belgium, Pietro Coletti (University of Hasselt), May 23, 13:00 – 14:00, E25
- Exploring the dynamics of nonlinear experiments using control-based continuation, Ludovic Renson (University of Bristol, UK), June 7, 13:00 – 14:00, E25
More information can be found on our website: https://www.naxys.be/events/2018-05/
Two events @UNamur
- Après-midi de la recherche, May 3, 13:00 – 17:00, CH01
- 10th CECI Scientific Day, May 4, 13:30 – 17:30, CH01
Publication in Physical Review Letters.
A recent work of naXys researchers Timoteo Carletti and Malbor Asllani on network theory has been published in the prestigious journal Physical Review Letters. More info
Abstract: We introduce a nonlinear operator to model diffusion on a complex undirected network under crowded conditions. We show that the asymptotic distribution of diffusing agents is a nonlinear function of the nodes’ degree and saturates to a constant value for sufficiently large connectivities, at variance with standard diffusion in the absence of excluded-volume effects. Building on this observation, we define and solve an inverse problem, aimed at reconstructing the a priori unknown connectivity distribution. The method gathers all the necessary information by repeating a limited number of independent measurements of the asymptotic density at a single node, which can be chosen randomly. The technique is successfully tested against both synthetic and real data and is also shown to estimate with great accuracy the total number of nodes.
Reference: Asllani, M., Carletti, T., Di Patti, F., Fanelli, D. & Piazza, F., Hopping in the Crowd to Unveil Network Topology, 2018, Physical Review Letters. 120, 15, 5 p., 158301.
By using a genetic algorithm, naXys researcher Alexandre Mayer and Michaël Lobet could optimize the design of nanopyramids that consist of only three stacks of metal/dielectric layers. These structures achieve quasi-perfect absorption of electromagnetic radiations for wavelengths between the UV and the near-infrared. The simplified design makes them easier to fabricate. These results were presented at the SPIE conference last month.
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