Now showing items 192-211 of 329

    • La gestión en la clase de matemáticas con actividades abiertas 

      Lópes, Antonio José; Vanegas, Yuly Marsela (Graó, 2016)
      En este artículo se presentan algunas reflexiones en torno a aspectos que consideramos fundamentales en la gestión de la clase de matemáticas: el planteamiento de un tipo de tarea que promueve el aprendizaje matemático y ...
    • Labeling constructions using digraph products 

      López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni; Rius Font, Miquel (Elsevier, 2013)
      In this paper we study the edge-magicness of graphs with equal size and order, and we use such graphs and digraph products in order to construct labelings of different classes and of different graphs. We also study super ...
    • Lability and mobility effects on mixtures of ligands under steady-state conditions 

      Galceran i Nogués, Josep; Puy Llorens, Jaume; Salvador, José; Cecilia Averós, Joan; Mas i Pujadas, Francesc; Garcés, Josep Lluís (Royal Society of Chemistry, 2003)
      Analytical solutions for the steady-state flux arriving at an active surface from a mixture (in which one active species reacts with non-active ligands in the medium) can be helpful in a variety of problems: voltammetric ...
    • Lability of complexes in steady-state finite planar diffusion 

      Salvador, José; Puy Llorens, Jaume; Cecilia Averós, Joan; Galceran i Nogués, Josep (Elsevier, 2006)
      The analytical solution of the reaction-diffusion problem of a species forming a complex (with any association and dissociation rate constants) in solution and disappearing at an active planar surface is presented for a ...
    • Langford sequences and a product of digraphs 

      López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni (Elsevier, 2016)
      Skolem and Langford sequences and their many generalizations have applications in numerous areas. The -product is a generalization of the direct product of digraphs. In this paper we use the -product and super edge-magic ...
    • Large restricted sumsets in general Abelian groups 

      Hamidoune, Yahya Ould; López Masip, Susana-Clara; Plagne, Alain (Elsevier, 2013)
      Let A, B and S be subsets of a finite Abelian group G. The restricted sumset of A and B with respect to S is defined as A ∧S B = {a + b : a ∈ A, b ∈ B and a − b /∈ S}. Let LS = maxz∈G |{(x, y) : x, y ∈ G, x + y = z and x ...
    • Las actitudes hacia las Matemáticas. Análisis descriptivo de un estudio de caso exploratorio centrado en la Educación Matemática de familiares 

      Estrada Roca, M. Asunción; Díez Palomar, Francisco Javier (Facultad de Ciencias de la Educación y del Deporte de la Universidad de Vigo, 2011)
      Partimos de investigaciones anteriores sobre actitudes hacia las Matemáticas y educación de personas adultas. Asumimos que las emociones son una parte importante del proceso de enseñanza y aprendizaje de las Matemáticas. ...
    • Lie symmetries and the center problem 

      Giné, Jaume (Shanghai Normal University & Wilmington Scientific Publisher, 2011)
      Abstract In this short survey we discuss the narrow relation between the center problem and the Lie symmetries. It is well known that an analytic vector field X having a non–degenerate center has a non–trivial analytic Lie ...
    • Liénard equation and its generalizations 

      Giné, Jaume (World Scientific Publishing, 2017)
      In this paper, we first present a survey of the known results on limit cycles and center conditions for Liénard differential systems. Next we propose a generalization of such systems and we study their center conditions ...
    • Limit cycles bifurcating from planar polynomial quasi--homogeneous centers 

      Giné, Jaume; Grau Montaña, Maite; Llibre, Jaume (Elsevier, 2015)
      In this paper we find an upper bound for the maximum number of limit cycles bifurcating from the periodic orbits of any planar polynomial quasi-homogeneous center, which can be obtained using first order averaging method. ...
    • Limits of the Linear Accumulation Regime of DGT Sensors 

      Mongin, Sandrine; Uribe Kaffure, Ramiro; Rey Castro, Carlos; Cecilia Averós, Joan; Galceran i Nogués, Josep; Puy Llorens, Jaume (American Chemical Society, 2013)
      A key question for the practical application of DGT (Diffusive Gradients in Thin films) as dynamic sensors in the environmental monitoring of trace metals is the influence of pH and dissolved ligands over the linear ...
    • Linearizability of planar polynomial Hamiltonian systems 

      Arcet, Barbara; Giné, Jaume; Romanovski, Valery G. (Elsevier, 2022)
      Isochronicity and linearizability of two-dimensional polynomial Hamiltonian systems are revisited and new results are presented. We give a new computational procedure to obtain the necessary and sufficient conditions for ...
    • Liouvillian integrability of a general Rayleigh-Duffing oscillator 

      Giné, Jaume; Valls, Claudia (Atlantis; Taylor & Francis, 2019)
      We give a complete description of the Darboux and Liouville integrability of a general Rayleigh-Duffing oscillator through the characterization of its polynomial first integrals, Darboux polynomials and exponential factors.
    • Looking back over their shoulders: a qualitative analysis of portuguese teachers' attitudes towards statistics 

      Martins, José Alenxadre; Nascimento, Maria Manuel; Estrada Roca, M. Asunción (International Association for Statistical Education, 2012)
      Teachers’ attitudes towards statistics can have a significant effect on their own statistical training, their teaching of statistics, and the future attitudes of their students. The influence of attitudes in teaching ...
    • Magic coverings and the Kronecker product 

      López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni; Rius Font, Miquel (2014)
      In this paper we study a relationship existing among (super) magic coverings and the well known Kronecker product of matrices. We also introduce the concept of Zn-property for digraphs in order to study this relation ...
    • 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 ...
    • Mixed Moore Cayley graphs 

      López Lorenzo, Ignacio; Pérez Rosés, Hebert; Pujolàs Boix, Jordi (Elsevier, 2014-09-01)
      Cayley graphs are well known objects with interesting properties, also in the context of Moore graphs and digraphs. In $1978$ Bos\'ak extended Moore's property to the mixed setting (with arcs allowed along with edges), in ...
    • Mobile terrestrial laser scanner applications in precision fruticulture/ horticulture and tools to extract information from canopy point clouds 

      Escolà i Agustí, Alexandre; Martínez Casasnovas, José Antonio; Rufat i Lamarca, Josep; Arnó Satorra, Jaume; Arbonés, Amadeu; Sebé Feixas, Francesc; Pascual Roca, Miquel; Gregorio López, Eduard; Rosell Polo, Joan Ramon (Springer Science+Business Media, 2017-01-01)
      LiDAR sensors are widely used in many areas and, in recent years, that includes agricultural tasks. In this work, a self-developed mobile terrestrial laser scanner based on a 2D light detection and ranging (LiDAR) sensor ...
    • Modeling inertia through the interaction with quantum fluctuations 

      Giné, Jaume; Gaetano Luciano, Giuseppe (Elsevier, 2021)
      The origin of inertia of macroscopic bodies has never been thoroughly elucidated. In this paper we provide a new explanation based on the following assumptions: (i) we can think of any body as being composed by resonant ...
    • 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 ...