Now showing items 209-228 of 347

    • 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 ...
    • Modeling road traffic safety based on point patterns of wildlife-vehicle collisions 

      Llagostera, Pol; Comas, C.; López, L. (Elsevier, 2022)
      Wildlife-vehicle collisions represent one of the main coexistence problems that appear between human populations and the environment. In general terms, this affects road safety, wildlife management, and the building of ...
    • Modeling tactical planning decisions through a linear optimization model in sow farms 

      Rodríguez Sánchez, Sara Verónica; Pla Aragonés, Lluís Miquel; Albornoz Sanhueza, Victor Manuel (Elsevier, 2012)
      This paper deals with tactical planning decisions for breeding farms producing piglets through a linear optimization model. A medium-term planning horizon based on weekly periods is considered. The proposed model maximizes ...
    • Modeling the consequences of the demise and potential recovery of a keystone-species: wild rabbits and avian scavengers in Mediterranean landscapes 

      Cortés-Avizanda, Ainara; Colomer, M. Àngels (Maria Àngels); Margalida, Antoni; Ceballos, Olga; Donázar, José A. (Nature Publishing Group, 2015)
      Restoration of demised keystone-species populations is an overriding concern in conservation biology. However, since no population is independent of its environment, progress is needed in predicting the efficacy of restoration ...
    • Modelling the effects of sanitary policies on European vulture conservation 

      Margalida, Antoni; Colomer, M. Àngels (Maria Àngels) (Nature Publishing Group, 2012)
      Biodiversity losses are increasing as a consequence of negative anthropogenic effects on ecosystem dynamics. However, the magnitude and complexity of these effects may still be greatly underestimated. Most Old World ...
    • Modelling the SARS-COV-2 outbreak: assessing the usefulness of protective measures to reduce the pandemic at population level 

      Colomer, M. Àngels (Maria Àngels); Margalida, Antoni; Alòs, Francesc; Oliva-Vidal, Pilar; Vilella, Anna; Fraile Sauce, Lorenzo José (Elsevier, 2021)
      A new bioinspired computational model was developed for the SARS-CoV-2 pandemic using the available epidemiological information, high-resolution population density data, travel patterns, and the average number of contacts ...
    • 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 ...