2,132 research outputs found

    Nonlocality-induced front interaction enhancement

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    We demonstrate that nonlocal coupling strongly influences the dynamics of fronts connecting two equivalent states. In two prototype models we observe a large amplification in the interaction strength between two opposite fronts increasing front velocities several orders of magnitude. By analyzing the spatial dynamics we prove that way beyond quantitative effects, nonlocal terms can also change the overall qualitative picture by inducing oscillations in the front profile. This leads to a mechanism for the formation of localized structures not present for local interactions. Finally, nonlocal coupling can induce a steep broadening of localized structures, eventually annihilating them.Comment: 4 pages, 6 figure

    Frequency planning optimisation in real mobile networks

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    Due to the annual increase of cellular subscribers, there is a growing interest by the network operators, in how to deploy the network infrastructure to achieve maximum capacity. A key point is the channel or frequency assignment, which implies efficiently assigning frequencies from a limited set, to each cell, while satisfying the electromagnetic compatibility constraints.Peer ReviewedPostprint (published version

    Theory for the spatiotemporal dynamics of domain walls close to a nonequilibrium Ising-Bloch transition

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    © 2015 American Physical Society. We derive a generic model for the interaction of domain walls close to a nonequilibrium-Bloch transition. The universal scenario predicted by the model includes stationary Ising and Bloch localized structures (dissipative solitons), as well as drifting and oscillating Bloch structures. Our theory also explains the behavior of Bloch walls during a collision. The results are confirmed by numerical simulations of the Ginzburg-Landau equation forced at twice its natural frequency and are in agreement with previous observations in several physical systems.Peer Reviewe

    Logical operations with Localized Structures

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    We show how to exploit excitable regimes mediated by localized structures (LS) to perform AND, OR, and NOT logical operations providing full logical functionality. Our scheme is general and can be implemented in any physical system displaying LS. In particular, LS in nonlinear photonic devices can be used for all-optical computing applications where several reconfigurable logic gates can be implemented in the transverse plane of a single device, allowing for parallel computing.Comment: 11 pages, 6 figure

    La codificació de la identitat visual dels envasos

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    El propassat 8 de febrer de 2013 es va llegir a la Facultat de Ciències de la Comunicació de la Universitat Autònoma de Barcelona (UAB) la tesi doctoral "La concepció de la indentitat visual dels envasos. Una aproximació a la funció publicitària del packaging" presentada per Jordi Colet Ruz i dirigida pel Dr. Daniel Tena Parera. Aquesta investigació aborda l'estudi del missatge publicitari expressat a través de la identitat visual dels envasos. Des d'aquesta perspectiva, es posa de manifest la rellevància estratègica del disseny estructural i gràfic d'aquests artefactes comunicatius gràcies a la immediatesa, força i permanència dels efectes del packaging sobre el comportament del consumidor

    Convective and Absolute Instabilities in the Subcritical Ginzburg-Landau Equation

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    We study the nature of the instability of the homogeneous steady states of the subcritical Ginzburg-Landau equation in the presence of group velocity. The shift of the absolute instability threshold of the trivial steady state, induced by the destabilizing cubic nonlinearities, is confirmed by the numerical analysis of the evolution of its perturbations. It is also shown that the dynamics of these perturbations is such that finite size effects may suppress the transition from convective to absolute instability. Finally, we analyze the instability of the subcritical middle branch of steady states, and show, analytically and numerically, that this branch may be convectively unstable for sufficiently high values of the group velocity.Comment: 13 pages, 10 figures (fig1.ps, fig2.eps, fig3.ps, fog4a.ps, fig 4b.ps, fig5.ps, fig6.eps, fig7a.ps, fig7b.ps, fig8.p

    El disseny de l'envàs com a estratègia per a la identificació tipològica del producte : estudi a l'entorn del prototipus visual en un refresc de cola

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    Aquesta investigació aborda l'estudi del disseny estructural i gràfic en els envasos des de la perspectiva del missatge publicitari. L'objecte d'estudi s'ha centrat en la implementació del codi visual que regula el disseny dels envasos a fi de facilitar el reconeixement tipològic del producte en un escenari advers i molt competitiu: el punt de venda. La metodologia experimental ha estat un disseny factorial de mesures repetides. Aquest enfoc ha permès plantejar una anàlisi estadística multivariable.This research focuses on the structural and the graphic pack design from the perspective of advertising message. The theoretical framework is limited by the conceptual dimensions of the visual artifact: communicative, material, commercial and psychological. How is formulated the visual message has become the leitmotiv of this work. Our subject is the implementation of the visual code that governs packaging in order to facilitate their typological recognition in an adverse and very competitive scenario: the point of sale. In this case, the study has been implemented with cans of cola. The experimental methodology used was an analysis of variance in repeated measures design. This approach has allowed us to do a multivariate statistical analysis
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