Enviaments recents

  • 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), ...
  • Direct MSTID mitigation in precise GPS processing 

    Hernández Pajares, Manuel; Wielgosz, Pawel; Paziewski, Jacek; Krypiak-Gregorczyk, Anna; Krukowska, Marta; Stepniak, Katarzyna; Kaplon, Jan; Hadas, Tomasz; Sosnica, Krzysztof; Bosy, Jaroslaw; Orús Pérez, Raul; Monte Moreno, Enrique; Yang, Heng; García Rigo, Alberto; Olivares Pulido, German (2017-03)
    Article
    Accés restringit per política de l'editorial
    In this paper, the authors summarize a simple and efficient approach developed to mitigate the problem in precise GNSS positioning originated by the most frequent ionospheric wave signatures: the Medium Scale Travelling ...
  • Libration transfer design using patched elliptic three-body models and graphics processing units 

    Peng, Hao; Bai, Xiaoli; Masdemont Soler, Josep; Gómez Muntané, Gerard; Xu, Shijie (2017-01-01)
    Article
    Accés obert
    Copyright © 2016 by the American Institute of Aeronautics and Astronautics, Inc. Design of the transfer from lunar orbits to the sun-Earth libration point region by direct searching in the highfidelity ephemeris model is ...
  • Reheating via gravitational particle production in simple models of quintessence or ¿CDM Inflation 

    Haro Cases, Jaume; Aresté Saló, Llibert (2017-11-14)
    Article
    Accés obert
    We have tested some simple CDM (the same test is also valid for quintessence) inflation models, imposing that they match with the recent observational data provided by the BICEP and Planck’s team and leading to a reheating ...
  • Consistency of seven different GNSS global ionospheric mapping techniques during one solar cycle 

    Roma Dollase, David; Hernández Pajares, Manuel; Krankowski, Andrzej; Kotulak, Kacper; Ghoddousi Fard, Reza; Yuan, Yunbin; Li, Zishen; Zhang, Hongping; Shi, Chuang; Wang, Cheng; Feltens, Joachim; Vergados, Panagiotis; Komjathy, Attila; Schaer, Stefan C.; García Rigo, Alberto; Gómez Cama, José Mª (2017-11-28)
    Article
    Accés obert
    In the context of the International GNSS Service (IGS), several IGS Ionosphere Associated Analysis Centers have developed different techniques to provide global ionospheric maps (GIMs) of vertical total electron content ...

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