Now showing items 21-27 of 27

    Subespacios hiperinvariantes y característicos : una aproximación geométrica 

    Montoro López, Ma. Eulàlia (Date of defense: 2015-05-12)

    The aim of this thesis is to study the hyperinvariant and characteristic subspaces of a matrix, or equivalently, of an endomorphism of a finite dimensional vector space. We restrict ourselves to the case of matrices A with ...

    A contribution to the theory of convolutional codes from systems theory piont of view 

    Um, Laurence Emilie (Date of defense: 2015-05-25)

    Information is such a valuable good of our time. Given that the transmission of information has always been subject to precision problems, knowing the obstacles existing between the transmitter and the receiver, eventual ...

    La ingeniería y el descarte artefactual de la desalación solar de agua : las industrias de Las Salinas, Sierra Gorda y Oficina Domeyko (1872-1907) 

    Arellano-Escudero, Nelson (Date of defense: 2015-05-26)

    In the nineteenth century, at the Atacama Desert, a phenomenon of competition occurred between different industrial water desalination techniques, one of which had excellent results and a long life using solar energy. It ...

    Application of dynamical system methods to galactic dynamics : from warps to double bars 

    Sánchez Martín, Patricia (Date of defense: 2015-06-29)

    Most galaxies have a warped shape when they are seen from an edge-on point of view. In this work we apply dynamical system methods to find an explanation of this phenomenon that agrees with its abundance among galaxies, ...

    Singular phenomena in the length spectrum of analytic convex curves 

    Tamarit Sariol, Anna (Date of defense: 2015-07-06)

    Consider the billiard map defined inside an analytic closed strictly convex curve Q. Given q>2 and 0<p<q relatively prime integers, there exist at least two (p,q)-periodic trajectories inside Q. The main goal of this thesis ...

    Diffusion through non-transverse heteroclinic chains : a long-time instability for the NLS 

    Simon López, Adrià (Date of defense: 2015-07-06)

    En l'article [CKSTT] els autors proven una inestabilitat global per a l'equació de Schrödinger cúbica desenfocant en el tor 2-dimensional. Per aconseguir-ho, detecten un sistema finit d'equacions diferencials ordinàries, ...

    Study of invariant manifolds in two different problems : the Hopf-zero singularity and neural synchrony 

    Castejón i Compnay, Oriol (Date of defense: 2015-07-16)

    The main object of study of this thesis are invariant manifolds in the field of dynamical systems. We deal with two different and independent topics, namely, the study of exponentially small splitting of invariant manifolds ...