Now showing items 21-40 of 290

    • Deriving quantised inertia using horizon-widths in the uncertainty principle 

      McCulloch, M. E.; Giné, Jaume (Hikari Ltd., 2020)
      In this paper we show that a model for inertial mass (quantised inertia) can be derived exactly and simply by assuming that the property of inertia is caused by gradients in the energy in the Unruh radiation field seen ...
    • New results for the Mondrian art problem 

      Dalfó, Cristina; Fiol, Miguel Angel; López Lorenzo, Ignacio (Elsevier, 2021)
      The Mondrian problem consists of dissecting a square of side length n ∈ N into non-congruent rectangles with natural length sides such that the difference d(n) between the largest and the smallest areas of the rectangles ...
    • Using PRRSV-resilient sows improve performance in endemic infected farms with recurrent outbreaks 

      Abella Falcó, Glòria; Pagès Bernaus, Adela; Estany Illa, Joan; Pena i Subirà, Ramona Natacha; Fraile Sauce, Lorenzo José; Pla Aragonés, Lluís Miquel (MDPI, 2021)
      The selection of porcine reproductive and respiratory syndrome (PRRS) resilient sows has been proposed as a strategy to control this disease. A discrete event-based simulation model was developed to mimic the outcome of ...
    • Orbital Reversibility of Planar Vector Fields 

      Algaba, Antonio; García, Cristóbal; Giné, Jaume (MDPI, 2021)
      In this work we use the normal form theory to establish an algorithm to determine if a planar vector field is orbitally reversible. In previous works only algorithms to determine the reversibility and conjugate reversibility ...
    • Directional analysis for point patterns on linear networks 

      Moradi, Mehdi; Mateu, Jorge; Comas Rodríguez, Carles (Wiley, 2020)
      Statistical analysis of point processes often assumes that the underlying process is isotropic in the sense that its distribution is invariant under rotation. For point processes on ℝ2, some tests based on the K‐ and nearest ...
    • Contribuciones al perfeccionamiento del sistema de transporte terrestre en Cuba 

      López Milán, Esteban; Pla Aragonés, Lluís Miquel; Rigol Cardona, Buenaventura; Reyes Gómez, Erik; Miquel Fernández, Silvia (Academia de Ciencias de Cuba, 2020)
      Introducción. En el sistema de transporte de Cuba se presentan problemas que demandan respuestas adecuadas. Esta investigación en sus inicios estuvo dirigida al transporte de la caña en los centrales azucareros de la ...
    • A general method to obtain the spectrum and local spectra of a graph from its regular partitions 

      Dalfó, Cristina; Fiol, Miguel Angel (International Linear Algebra Society, 2020-07-12)
      It is well known that, in general, part of the spectrum of a graph can be obtained from the adjacency matrix of its quotient graph given by a regular partition. In this paper, a method that gives all the spectrum, and also ...
    • Modified inertia from extended uncertainty principle(s) and its relation to MoND 

      Giné, Jaume; Gaetano Luciano, Giuseppe (Springer, 2020)
      In this paper we show that Modified Inertia, i.e., the modification of inertia predicted by some alternative theories of gravity at cosmic scales, can be naturally derived within the framework of the extended uncertainty ...
    • Modified inertial mass from information loss 

      McCulloch, M. E.; Giné, Jaume (World Scientific Publishing, 2017)
      A modification of inertia (called MiHsC or quantized inertia) has been proposed that assumes that inertia is caused by Unruh radiation, and that this radiation is made inhomogeneous in space by either Rindler horizons ...
    • Numerical Simulation of Non-Linear Models of Reaction—Diffusion for a DGT Sensor 

      Cecilia Averós, Joan; Puy Llorens, Jaume; Uribe Kaffure, Ramiro (MDPI, 2020-04-20)
      In this work, we present a novel strategy for the numerical solution of a coupled system of partial differential equations that describe reaction–diffusion processes of a mixture of metals and ligands that can be absorbed ...
    • A Construction for Providing Reusability to Mobile Phone-Based e-Tickets 

      Borges Llorens, Ricard; Sebé Feixas, Francesc (IEEE, 2020)
      Nowadays, the use of electronic tickets in public transport is a reality. Several mobile phone-based e-ticket systems have been proposed so far. Even so, very few of them include reusability in the sense that a single ...
    • New Moore-Like Bounds and Some Optimal Families of Abelian Cayley Mixed Graphs 

      Dalfó, Cristina; Fiol, Miguel Angel; López Lorenzo, Ignacio (2020-06-06)
      Mixed graphs can be seen as digraphs that have both arcs and edges (or digons, that is, two opposite arcs). In this paper, we consider the case where such graphs are Cayley graphs of abelian groups. Such groups can be ...
    • Identifying codes in line digraphs 

      Balbuena Martínez, Camino; Dalfó, Cristina; Martínez Barona, Berenice (Elsevier, 2020-05-21)
      Given an integer ≥1, a (1, ≤ )-identifying code in a digraph is a dominating subset C of vertices such that all distinct subsets of vertices of cardinality at most have distinct closed in-neighborhoods within C . In ...
    • An improved Moore bound and some new optimal families of mixed Abelian Cayley graphs 

      Dalfó, Cristina; Fiol, Miguel Angel; López Lorenzo, Ignacio; Ryan, Joe (Elsevier, 2020)
      We consider the case in which mixed graphs (with both directed and undirected edges) are Cayley graphs of Abelian groups. In this case, some Moore bounds were derived for the maximum number of vertices that such graphs can ...
    • Vaccination is a suitable tool in the control of Aujeszky's disease outbreaks in pigs using a Population Dynamics P systems model 

      Colomer, M. Àngels (Maria Àngels); Margalida, Antoni; Fraile Sauce, Lorenzo José (MDPI, 2020)
      Aujeszky's disease is one of the main pig viral diseases and results in considerable economic losses in the pork production industry. The disease can be controlled using preventive measures such as improved stock management ...
    • A counterexample to the composition condition conjecture for polynomial Abel differential equations 

      Giné, Jaume; Grau Montaña, Maite; Santallusia Esvert, Xavier (Cambridge University Press, 2019)
      Polynomial Abel differential equations are considered a model problem for the classical Poincaré center–focus problem for planar polynomial systems of ordinary differential equations. In the last few decades, several works ...
    • Assessing Prospective Teachers’ Affective Component Related to Working with Statistical Projects 

      Gea, María M.; Estrada Roca, M. Asunción; Batanero, Carmen (Universidade Luterana do Brasil, 2019)
      The aim of this paper was to evaluate the cognitive component of Spanish prospective high school teachers about correlation and regression. The evaluation is based on the analysis of the cognitive suitability of a statistical ...
    • Chiellini Hamiltonian Liénard differential systems 

      Giné, Jaume; Llibre, Jaume; Valls, Claudia (Texas State University, 2019)
      We characterize the centers of the Chiellini Hamiltonian Li´enard second-order differential equations x 0 = y, y 0 = −f(x)y − g(x) where g(x) = f(x)(k − α(1 + α) R f(x)dx) with α, k ∈ R. Moreover we study the ...
    • Spectra and eigenspaces from regular partitions of Cayley (di)graphs of permutation groups 

      Dalfó, Cristina; Fiol, Miguel Angel (Elsevier, 2020)
      In this paper, we present a method to obtain regular (or equitable) partitions of Cayley (di)graphs (that is, graphs, digraphs, or mixed graphs) of permutation groups on n letters. We prove that every partition of the ...
    • Strongly formal Weierstrass non-integrability for polynomial differential systems in C2 

      Giné, Jaume; Llibre, Jaume (Bolyai Institute, University of SzegedHungarian Academy of Sciences, 2020)
      Recently a criterion has been given for determining the weakly formal Weierstrass non-integrability of polynomial differential systems in C2 . Here we extend this criterion for determining the strongly formal Weierstrass ...