Enviaments recents

  • Multi-TID detection and characterization in a dense Global Navigation Satellite System receiver network 

    Yang, Heng; Monte Moreno, Enrique; Hernández Pajares, Manuel (2017-09-01)
    Article
    Accés restringit per política de l'editorial
    The medium-scale traveling ionospheric disturbances (MSTIDs) constitute the most frequent ionospheric wave signatures. We propose a method for detecting the number of simultaneous MSTIDs from a time series of high-pass-filtered ...
  • Linear buckling analysis of perforated cold-formed steel storage rack columns by means of the generalised beam theory 

    Casafont Ribera, Miguel; Bonada Bo, Jordi; Pastor Artigues, María Magdalena; Roure Fernández, Francisco; Susín Sánchez, Antonio (2017-03)
    Article
    Accés restringit per política de l'editorial
    The investigation attempts to adapt a be am finite element procedure based on the Generalised Beam Theory (GBT) to the analysis of perforated columns. The presence of perforations is taken into account through the use of ...
  • Gemelli-obturator complex in the deep gluteal space: an anatomic and dynamic study 

    Balius, Ramon; Susín Sánchez, Antonio; Morros, Carles; Pujol, Montse; Pérez Cuenca, Dolores; Sala Blanch, Xavier (2017-12-07)
    Article
    Accés restringit per política de l'editorial
    Objective: To investigate the behavior of the sciatic nerve during hip rotation at subgluteal space. Materials and methods: Sonographic examination (high-resolution ultrasound machine at 5.0–14 MHZ) of the gemelli-obturator ...
  • Quintessential inflation at low reheating temperatures 

    Aresté Saló, Llibert; Haro Cases, Jaume (2017-11-23)
    Article
    Accés obert
    We have tested some simple quintessential inflation models, imposing the requirement that they match with the recent observational data provided by the BICEP and Planck team and leading to a reheating temperature, which ...
  • Homotopy linear algebra 

    Gálvez Carrillo, Maria Immaculada; Kock, Joachim; Tonks, Andrew (2017-10-17)
    Article
    Accés restringit per política de l'editorial
    By homotopy linear algebra we mean the study of linear functors between slices of the 8-category of 8-groupoids, subject to certain finiteness conditions. After some standard definitions and results, we assemble said slices ...
  • Transformation and decomposition of clutters into matroids 

    Martí Farré, Jaume; Mier Vinué, Anna de (2017-05-25)
    Article
    Accés restringit per política de l'editorial
    A clutter is a family of mutually incomparable sets. The set of circuits of a matroid, its set of bases, and its set of hyperplanes are examples of clutters arising from matroids. In this paper we address the question of ...
  • Parrondo's dynamic paradox for the stability of non-hyperbolic fixed points 

    Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2018-02)
    Article
    Accés restringit per política de l'editorial
    We show that for periodic non-autonomous discrete dynamical systems, even when a common fixed point for each of the autonomous associated dynamical systems is repeller, this fixed point can became a local attractor for ...
  • Image segmentation based on statistical confidence intervals 

    Buenestado Caballero, Pablo; Acho Zuppa, Leonardo (2018-01-11)
    Article
    Accés obert
    Image segmentation is defined as a partition realized to an image into homogeneous regions to modify it into something that is more meaningful and softer to examine. Although several segmentation approaches have been ...
  • Second order linear difference equations 

    Encinas Bachiller, Andrés Marcos; Jiménez Jiménez, M. Jose (2017-12-04)
    Article
    Accés obert
    We provide the explicit solution of a general second order linear difference equation via the computation of its associated Green function. This Green function is completely characterized and we obtain a closed expression ...
  • On trees with the same restricted U-polynomial and the Prouhet–Tarry–Escott problem 

    Aliste Prieto, José; Mier Vinué, Anna de; Zamora, José (2017-06)
    Article
    Accés restringit per política de l'editorial
    This paper focuses on the well-known problem due to Stanley of whether two non-isomorphic trees can have the same U-polynomial (or, equivalently, the same chromatic symmetric function). We consider the Uk-polynomial, which ...
  • Distance 2-domination in prisms of graphs 

    Hurtado Díaz, Fernando Alfredo; Mora Giné, Mercè; Rivera Campo, Eduardo; Zuazua Vega, Rita Esther (2017-01-01)
    Article
    Accés restringit per política de l'editorial
    A set of vertices D of a graph G is a distance 2-dominating set of G if the distance between each vertex u ¿ ( V ( G ) - D ) and D is at most two. Let ¿ 2 ( G ) denote the size of a smallest distance 2 -dominating set of ...
  • Sibsonian and non-Sibsonian natural neighbour interpolation of the total electron content value 

    Kotulak, Kacper; Fron, Adam; Krankowski, Andrzej; Olivares Pulido, German; Hernández Pajares, Manuel (2017-03)
    Article
    Accés obert
    In radioastronomy the interferometric measurement between radiotelescopes located relatively close to each other helps removing ionospheric effects. Unfortunately, in case of networks such as LOw Frequency ARray (LOFAR), ...

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