Ara es mostren els items 8-23 de 23

    • Design of highly synchronizable and robust networks 

      Estrada Roger, Ernesto; Gago Álvarez, Silvia; Caporossi, Gilles (2010-11)
      Article
      Accés restringit per política de l'editorial
      In this paper, the design of highly synchronizable, sparse and robust dynamical networks is addressed. Better synchronizability means faster synchronization of the oscillators, sparsity means a low ratio of links per ...
    • Eigenvalue distribution in scale free graphs 

      Gago Álvarez, Silvia (2007-08-16)
      Article
      Accés obert
      Scale free graphs can be found very often as models of real networks and are characterized by a power law degree distribution, that is, for a constant $\gamma\geq 1$ the number of vertices of degree $d$ is proportional ...
    • Green matrices of weighted graphs with pendant vertices 

      Gago Álvarez, Silvia (2014)
      Presentació
      Accés obert
    • Green operators of networks with a new vertex 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia; Mitjana Riera, Margarida (Elsevier, 2016-02)
      Article
      Accés obert
      Any elliptic operator defines an automorphism on the orthogonal subspace to the eigenfunctions associated with the lowest eigenvalue, whose inverse is the orthogonal Green operator. In this study, we show that elliptic ...
    • Green's function of a weighted $n$-cycle 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia; Jiménez Jiménez, María José; Mitjana Riera, Margarida (2016)
      Text en actes de congrés
      Accés obert
    • Group inverse of the laplacian of connections of networks 

      Gago Álvarez, Silvia (2018-03-25)
      Report de recerca
      Accés restringit per política de l'editorial
      In previous works the group inverse of a network obtained by some perturbations, as the deletion of a vertex, the addition of a new vertex, contraction of an edge, etc. is obtained in terms of the group inverse of the ...
    • Jacobi matrices and boundary value problems in distance-regular graphs 

      Bendito Pérez, Enrique; Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia (2012-01-25)
      Report de recerca
      Accés obert
      In this work we analyze regular boundary value problems on a distance-regular graph associated with SchrÄodinger operators. These problems include the cases in which the boundary has two or one vertices. Moreover, we obtain ...
    • Kirchhoff index of a non-complete wheel 

      Gago Álvarez, Silvia (2016)
      Article
      Accés obert
      In this work, we compute analitycally the Kirchhoff index and effective resistances of a weighted non–complete wheel that has been obtained by adding a vertex to a weighted cycle and some edges conveniently chosen. To this ...
    • Matriz Laplaciana de grafos ponderados con vértices independientes 

      Gago Álvarez, Silvia (Editorial Universidad de Almería, 2015)
      Text en actes de congrés
      Accés obert
    • Notes on betweenness centrality of a graph 

      Gago Álvarez, Silvia; Hurajová, Jana; Madaras, Tomas (2009-05-19)
      Report de recerca
      Accés obert
      The betweenness centrality of a vertex of a graph is the portion of shortest paths between all pairs of vertices passing through that vertex. We study selected general properties of this invariant and its relations to ...
    • On decay centrality in graphs 

      Coronicová Hurajová, Jana; Gago Álvarez, Silvia; Madaras, Tomas (2018-08-06)
      Article
      Accés obert
      The decay centrality of a vertex v in a graph G with respect to a parameter d¿(0,1) is a polynomial in d such that for fixed k the coefficient of dk is equal to the number of vertices of G at distance k from v. This invariant ...
    • On golden spectral graphs 

      Estrada Roger, Ernesto; Gago Álvarez, Silvia (2009-03-26)
      Report de recerca
      Accés obert
      The concept of golden spectral graphs is introduced and some of their general properties reported. Golden spectral graphs are those having a golden proportion for the spectral ratios defined on the basis of the spectral ...
    • The betweenness centrality of a graph 

      Gago Álvarez, Silvia (2007-05-10)
      Article
      Accés obert
      A measure of the centrality of a vertex of a graph is the portion of shortest paths crossing through it between other vertices of the graph. This is called betweenness centrality and here we study some of its general ...
    • The group inverse of extended symmetric and periodic Jacobi matrices 

      Gago Álvarez, Silvia (2016-02-02)
      Report de recerca
      Accés obert
      In this work, we explicitly compute the group inverse of symmetric and periodic Jacobi matrices with constant elements that have been extended by adding a row and a column conveniently de ned. For this purpose, we interpret ...
    • The inverses of some circulant matrices 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia; Jiménez Jiménez, María José; Mitjana Riera, Margarida (2015-11-01)
      Article
      Accés obert
      We present here necessary and su cient conditions for the invertibility of circulant and symmetric matrices that depend on three parameters and moreover, we explicitly compute the inverse. The techniques we use are related ...
    • Two-side boundary value problems in distance-regular graphs 

      Carmona Mejías, Ángeles; Encinas Bachiller, Andrés Marcos; Gago Álvarez, Silvia (Universidad de Almería, 2012)
      Comunicació de congrés
      Accés obert
      In this work we analyze regular boundary value problems on a distanceregular graph associated with Schr¨odinger operators in the case that the boundary has two vertices. Moreover, we obtain the Green matrix for each ...