archive-es.com » ES » U » UIB-CSIC.ES

Total: 1415

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • Publication details - IFISC
    036213 1 7 2011 We use the cubic complex Ginzburg Landau equation linearly coupled to a dissipative linear equation as a model for lasers with an external frequency selective feedback This system may also serve as a general pattern formation model in media driven by an intrinsic gain and selective feedback While strictly speaking the approximation of the laser nonlinearity by a cubic term is only valid for small field intensities it qualitatively reproduces results for dissipative solitons obtained in models with a more complex nonlinearity in the whole parameter region where the solitons exist The analysis is focused on two dimensional stripe shaped and vortex solitons An analytical expression for the stripe solitons is obtained from the known one dimensional soliton solution and its relation with vortex solitons is highlighted The radius of the vortices increases linearly with their topological charge m therefore the stripe shaped soliton may be interpreted as the vortex with m and conversely vortex solitons can be realized as unstable stripes bent into stable rings The results for the vortices are applicable for a broad class of physical systems DOI 10 1103 PhysRevE 84 036213 Fitxers PhysRevE 84 036213 pdf 557948 Bytes Tornar a la

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2193 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    hypothalamus In physiological conditions the system of neurons is very efficiently entrained by the 24 hour light dark cycle Most of the studies carried out so far emphasize the crucial role of the periodicity imposed by the light dark cycle in neuronal synchronization Nevertheless heterogeneity as a natural and permanent ingredient of these cellular interactions is seemingly to play a major role in these biochemical processes In this paper we use a model that considers the neurons of the suprachiasmatic nucleus as chemically coupled modified Goodwin oscillators and introduce non negligible heterogeneity in the periods of all neurons in the form of quenched noise The system response to the light dark cycle periodicity is studied as a function of the interneuronal coupling strength external forcing amplitude and neuronal heterogeneity Our results indicate that the right amount of heterogeneity helps the extended system to respond globally in a more coherent way to the external forcing Our proposed mechanism for neuronal synchronization under external periodic forcing is based on heterogeneity induced oscillators death damped oscillators being more entrainable by the external forcing than the self oscillating neurons with different periods DOI 10 1098 rsfs 2010 0327 Identificador ArXiv 1006 3446 Fitxers CircadianFinal

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2121 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    the study and comprehension of the evolutionary processes that govern biodiversity together with the huge expansion that the complex network approach has undergone in the last decade has motivated us to address the interrelation of both scienti c elds In that sense within the context of complex network theory the main purpose of this work has been to provide new tools for the topological characterization of evolutionary trees as well as to contribute to enlarging the knowledge of the evolutionary patterns depicted in them Thereby we have proposed an approach based on the depth scaling analysis of phylogenetic trees in order to carry out comparative studies between micro and macroevolutionary phylogenies gene and species evolutionary trees as well as a comparative study of the e ects of the rank based and rank free taxonomic criteria over the topology of evolutionary trees Besides we have examined the information stored in the branch length of the phylograms in order to characterize the branch length distribution along the Tree of Life The datasets analyzed in this thesis have been compiled in the URL http ifisc uib csic es alejandro phylotreedata also available at http ifisc uib csic es eden phylotreedata Fitxers PhDThesis HerradaEA

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2194 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    Miguel Maxi and Eguíluz Víctor M Master Thesis 2011 Fitxers tesinaMaster pdf 4222684 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

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2190 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    self imposed travel limitations contributed to a decline of about 40 in international air traffic to from Mexico following the international alert However no containment was achieved by such restrictions and the virus was able to reach pandemic proportions in a short time When gauging the value and efficacy of mobility and travel restrictions it is crucial to rely on epidemic models that integrate the wide range of features characterizing human mobility and the many options available to public health organizations for responding to a pandemic Here we present a comprehensive computational and theoretical study of the role of travel restrictions in halting and delaying pandemics by using a model that explicitly integrates air travel and short range mobility data with high resolution demographic data across the world and that is validated by the accumulation of data from the 2009 H1N1 pandemic We explore alternative scenarios for the 2009 H1N1 pandemic by assessing the potential impact of mobility restrictions that vary with respect to their magnitude and their position in the pandemic timeline We provide a quantitative discussion of the delay obtained by different mobility restrictions and the likelihood of containing outbreaks of infectious diseases at their source confirming the

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2189 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    in a taxonomically diverse range of species There is considerable interest in the processes that could underlie the evolution of sex biased parasitism Mating system differences along with differences in lifespan may play a key role We examine whether these factors are likely to lead to male biased parasitism through natural selection taking into account the critical role that ecological feedbacks play in the evolution of defence We use a host parasite model with two sexes and the techniques of adaptive dynamics to investigate how mating system and sexual differences in competitive ability and longevity can select for a bias in the rates of parasitism Male biased parasitism is selected for when males have a shorter average lifespan or when males are subject to greater competition for resources Male biased parasitism evolves as a consequence of sexual differences in life history that produce a greater proportion of susceptible females than males and therefore reduce the cost of avoiding parasitism in males Different mating systems such as monogamy polygyny or polyandry did not produce a bias in parasitism through these ecological feedbacks but may accentuate an existing bias DOI doi 10 1016 j jtbi 2010 10 004 Identificador ArXiv 1007 1320v1

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2139 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    interactions affects its synchronisation properties We will address the question from two points of view Firstly we will investigate the role of competitive interactions on the synchronisation among identical oscillators Then we will show that the presence of a fraction of repulsive links results in the appearance of macroscopic oscillations at that signal s rhythm in regions where the individual oscillator is unable to synchronise with a weak external signal

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2160 (2016-02-15)
    Open archived version from archive

  • Publication details - IFISC
    numerically and experimentally obtained times series we find that permutation entropy and permutation statistical complexity allow to extract important characteristics of the dynamics of the system We provide evidence that permutation statistical complexity is complementary to permutation entropy giving valuable insights into the role of the different time scales involved in the chaotic regime of the semiconductor laser dynamics subject to delay optical feedback The results obtained confirm that this

    Original URL path: http://ifisc.uib-csic.es/publications/publication-detail.php?indice=2141 (2016-02-15)
    Open archived version from archive



  •