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of a laser diode with optical feedback increases when adding noise up to an optimal value of the noise strength Both phase and amplitude fluctuations of the pulses play a relevant role in the dynamics of the system We introduce the joint entropy of the two variables to generalize the indicator of coherence and we put in evidence the mechanism of destruction of the excitable orbit after the resonance ps

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=364 (2016-02-15)

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diffusion like operators It is observed that operators with anisotropic derivatives lead to an essentially constant intrinsic period of the KL instability whereas isotropic derivatives lead to the temporal divergence of this period as happens in the original model without spatial dependence Outside the unstable KL region there is a regime in which three competing stable states coexist In one spatial dimension there is domain growth and the final state is an homogeneous solution filling up the whole system We find that this coarsening process is self similar with a growth law that possesses two clearly defined dominant behaviors In two dimensions the limit of potential dynamics is such that there is domain growth with self similar evolution On the contrary the nonpotential dynamics may inhibit coarsening for large enough system sizes We study the influence of nonpotential effects on front motion as well as the formation of defects formed by three armed spirals These defects together with the nonpotential dynamics are responsible for coarsening inhibition in large systems When only two amplitudes are excited during the growth process spiral formation is not possible and coarsening takes place This growth process as in the case of one dimension is self similar with a growth law different from that of the potential dynamics limit The study performed in chapter 3 belongs to the general framework of pattern formation in systems with broken symmetries In particular we study the effect of a temporal modulation at three times the critical frequency on a Hopf bifurcation The system is modeled with a complex Ginzburg Landau equation with an extra quadratic term resulting from the strong coupling between the external field and unstable modes The forcing breaks the phase symmetry and three stable phase locked states appear above a critical forcing intensity For large forcings

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=363 (2016-02-15)

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Claudio R Mirasso E Hernandez Garcia and Oreste Piro Unsolved Problems of Noise and Fluctuations UPON 99 Second international conference D Abbot L Kish editors American Institute of Physics Melville NY 255 262 2000 Paper ps gz Fitxers adelaida ps gz 830459 Bytes Tornar a la llista de publicacions Cerca publicacions Conté la paraula es Operador AND OR NOT Paraules adicionals Línia d investigació Totes Complex Quantum Optics Fluids Biosystems

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=315 (2016-02-15)

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Within this dynamical picture a diverging alternating period is calculated in a reduced dynamics given by a time dependent Hamiltonian with decreasing energy A mean period is calculated which results from noise stabilization of a mean energy The consideration of spatial dependent amplitudes leads to vertex formation The competition of front motion around the vertices and the Kuppers Lortz instability in determining an alternating period is discussed Fitxers bh pdf

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=357 (2016-02-15)

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San Miguel M Balle S Mulet J Mirasso C R Tolkachova E and Tredicce J R In Physics and Simulation of Optoelectronic Devices VIII SPIE Procs 3944 242 251 2000 spie00 ps gz spie00 tex Fitxers spie00 ps gz 456565 Bytes spie00 tex 36828 Bytes 0356 html 1802 Bytes Tornar a la llista de publicacions Cerca publicacions Conté la paraula es Operador AND OR NOT Paraules adicionals Línia d investigació

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=356 (2016-02-15)

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46882 Bytes Fig5 2 ps 7449 Bytes figure3 ps 11015 Bytes figure10 ps 33880 Bytes figure12 ps 26055 Bytes Fig5 3 ps 304402 Bytes figure11 ps 36114 Bytes Fig3 6 ps 204852 Bytes Fig5 5 ps 277427 Bytes tot tex 240480 Bytes Fig5 6 ps 1008325 Bytes Fig3 2 ps 11091 Bytes tot pdf 1642202 Bytes Fig5 4 ps 307652 Bytes tot ps 10282856 Bytes Fig3 4 ps 2537153 Bytes

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=91 (2016-02-15)

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noise A mean field approach for conserved order parameter systems is developed and used to obtain the phase diagram of the model Mean field results are compared with numerical simulations of the complete model in two dimensions Additionally a comparison between the noise driven dynamics of conserved and nonconserved systems is made at the level of the mean field approximation Postscript version available here Fitxers paper ps gz 104070 Bytes

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=154 (2016-02-15)

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of sound pressure waves into nervous impulses I investigate the universal properties of oscillators in the vicinity of a Hopf bifurcation to explain the behavior observed experimentally In particu lar I show that the amplitude response curves of periodically forced oscillators have the same characteristics as the sensitivity curves of our auditory system In Chap ter 3 I present a mechanism that explains via a Turing bifurcation the formation of a sausage string pattern that appears when increasing the arterial pressure in small blood vessels This structure appears as an instability due to the nonlinear stress strain relation of the blood vessel walls In the context of extended dynamical systems with some kind of disordered behavior Chapter 4 is dedicated to the formation of disordered structures in space but stationary in time the so called spatial chaos Al though frozen spatial chaos has been previously observed in other contexts our work is the first to show an example where its appearance is a consequence of the shape of the domain and the boundary conditions In Chapter 5 I study spatio temporally chaotic systems in bounded domains A generic system displaying a chaotic regime in a domain with boundary conditions other than periodic gives rise to a structured time averaged pattern similar to the ones experimentally observed Changing the boundary conditions I fnd that the average also changes adjusting to the global symmetry of the problem including both the evolution equations and the boundary conditions Chapter 6 is dedicated to the complex Ginzburg Landau equation that is a model equation of extended dynamical system with a great wealth of dynamical regimes Studying this system in square circular and stadium like shaped domains there appear solutions like targets that are difficult to obtain without these contours Finally Chapter 7 is dedicated to

Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=448 (2016-02-15)

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