Recent Submissions

  • Center problem and ν-cyclicity of polynomial zero-Hopf singularities with non-singular rotation axis 

    García, I. A. (Isaac A.) (Elsevier, 2021-06-02)
    We consider three-dimensional polynomial families of vector fields parameterized by the admissible coefficients having a fixed zero-Hopf equilibrium and a non-singular rotation axis through it. We are interested in the ...
  • Some remarks on global analytic planar vector fields possessing an invariant analytic set 

    García, I. A. (Isaac A.) (Taylor and Francis, 2021-02-01)
    We study the problem of determining the canonical form that a planar analytic vector field in all the real plane can have in order to possess a given invariant analytic set. We determine some conditions that guarantee that ...
  • Economic assessment of pig meat processing and cutting production by simulation 

    Pla Aragonés, Lluís Miquel; Pagès Bernaus, Adela; Nadal Roig, Esteve; Mateo Fornés, Jordi; Tarrafeta, Pedro; Mendioroz, Daniel; Pérez Cànovas, Lorea; López Nogales, Sandy (Walter de Gruyter, 2019-04)
    This paper presents the development and adoption of a discrete event simulation model of a pig meat-packing plant located in Navarre (Spain). The simulation model was developed to represent all the tasks and pig meat cuts ...
  • Minimum tree decompositions with a given tree as a factor 

    Lladó, Anna; López Masip, Susana-Clara (Combinatorial Mathematics Society of Australasia, 2005)
    A tree decomposition of a graph G is a family of subtrees whose sets of edges partition the set of edges of G. In this paper we are interested in the structure of the trees involved in tree decompositions with the minimum ...
  • Modeling of Vaccination and Contact Tracing as Tools to Control the COVID-19 Outbreak in Spain 

    Colomer, M. Àngels (Maria Àngels); Margalida, Antoni; Alòs, Francesc; Oliva-Vidal, Pilar; Vilella, Anna; Fraile Sauce, Lorenzo José (MDPI, 2021)
    We developed an agent-based stochastic model, based on P Systems methodology, to decipher the effects of vaccination and contact tracing on the control of COVID-19 outbreak at population level under different control ...
  • Vanishing set of inverse Jacobi multipliers and attractor/repeller sets 

    García, I. A. (Isaac A.); Giné, Jaume; Llibre, Jaume; Maza Sabido, Susanna (American Institute of Physics, 2021-01-01)
    In this paper we study conditions under which the zero-set of the inverse Jacobi multiplier of a smooth vector field contains its attractor/repeller compact sets. The work generalizes previous results focusing on sink ...
  • Decompositions of a rectangle into non-congruent rectangles of equal area 

    Dalfó, Cristina; Fiol, Miguel Angel; López Lorenzo, Ignacio; Martínez Pérez, Álvaro (Elsevier, 2021-06)
    In this paper, we deal with a simple geometric problem: Is it possible to partition a rectangle into k non-congruent rectangles of equal area? This problem is motivated by the so-called 'Mondrian art problem' that asks a ...
  • Highest weak focus order for trigonometric Liénard equations 

    Gasull, Armengol; Giné, Jaume; Valls, Claudia (Springer, 2020)
    Given a planar analytic differential equation with a critical point which is a weak focus of order k, it is well known that at most k limit cycles can bifurcate from it. Moreover, in case of analytic Liénard differential ...
  • Higher Accuracy of Lung Ultrasound over Chest X-ray for Early Diagnosis of COVID-19 Pneumonia 

    Martínez Redondo, Javier; Comas Rodríguez, Carles; Pujol Salud, Jesús; Crespo Pons, Montserrat; García Serrano, Cristina; Ortega Bravo, Marta; Palacín Peruga, Jose María (MDPI, 2021)
    Background: The COVID-19 pandemic rapidly strained healthcare systems worldwide. The reference standard for diagnosis is a positive reverse transcription polymerase chain reaction (RTPCR) test, but results are not immediate ...
  • Evaluation of Replacement Policies in Sow Farms Using ArenaTM Simulation Software 

    Montufar Benítez, Marco Antonio; Pla Aragonés, Lluís Miquel; Serrato Garcia, Marco A.; Montaño Arango, Oscar; Corona Armenta, José Ramón (Scientific Research Publishing Inc., 2014)
    This paper presents an application of the simulation of discrete events (SED) using ARENATM in the management of large-scale breeding farms. The main objective of the simulation model is to find a policy of replacement, ...
  • Prospective Primary School Teachers’ Attitudes towards Probability and its Teaching 

    Estrada Roca, M. Asunción; Batanero, Carmen (Modestum Publishing Ltd., 2020)
    Since probability is a new topic at the primary school level in many countries, many primary school teachers may consider themselves not well prepared or may not value the formative role of probability as a topic for their ...
  • 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 ...

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