Articles de revista
http://hdl.handle.net/2117/3918
2016-12-08T20:03:00ZLa espectroscopía raman aplicada a la identificación de materiales pictóricos
http://hdl.handle.net/2117/97876
La espectroscopía raman aplicada a la identificación de materiales pictóricos
Ruiz Moreno, Sergio; Yúfera Gomez, José Manuel; Soneira Ferrando, M. José; Breitman Mansilla, Mónica Celia; Morillo Bosch, M. Paz; Gràcia Rivas, Ignacio
2016-12-07T14:46:16ZRuiz Moreno, SergioYúfera Gomez, José ManuelSoneira Ferrando, M. JoséBreitman Mansilla, Mónica CeliaMorillo Bosch, M. PazGràcia Rivas, IgnacioA Second Order Expansion of the Separatrix Map for Trigonometric Perturbations of a Priori Unstable Systems
http://hdl.handle.net/2117/97772
A Second Order Expansion of the Separatrix Map for Trigonometric Perturbations of a Priori Unstable Systems
Guàrdia Munarriz, Marcel; Kaloshin, Vadim; Zhang, Jianlu
In this paper we study a so-called separatrix map introduced by Zaslavskii–Filonenko (Sov Phys JETP 27:851–857, 1968) and studied by Treschev (Physica D 116(1–2):21–43, 1998; J Nonlinear Sci 12(1):27–58, 2002), Piftankin (Nonlinearity (19):2617–2644, 2006) Piftankin and Treshchëv (Uspekhi Mat Nauk 62(2(374)):3–108, 2007). We derive a second order expansion of this map for trigonometric perturbations. In Castejon et al. (Random iteration of maps of a cylinder and diffusive behavior. Preprint available at arXiv:1501.03319, 2015), Guardia and Kaloshin (Stochastic diffusive behavior through big gaps in a priori unstable systems (in preparation), 2015), and Kaloshin et al. (Normally Hyperbolic Invariant Laminations and diffusive behavior for the generalized Arnold example away from resonances. Preprint available at http://www.terpconnect.umd.edu/vkaloshi/, 2015), applying the results of the present paper, we describe a class of nearly integrable deterministic systems with stochastic diffusive behavior.
2016-12-05T13:05:01ZGuàrdia Munarriz, MarcelKaloshin, VadimZhang, JianluIn this paper we study a so-called separatrix map introduced by Zaslavskii–Filonenko (Sov Phys JETP 27:851–857, 1968) and studied by Treschev (Physica D 116(1–2):21–43, 1998; J Nonlinear Sci 12(1):27–58, 2002), Piftankin (Nonlinearity (19):2617–2644, 2006) Piftankin and Treshchëv (Uspekhi Mat Nauk 62(2(374)):3–108, 2007). We derive a second order expansion of this map for trigonometric perturbations. In Castejon et al. (Random iteration of maps of a cylinder and diffusive behavior. Preprint available at arXiv:1501.03319, 2015), Guardia and Kaloshin (Stochastic diffusive behavior through big gaps in a priori unstable systems (in preparation), 2015), and Kaloshin et al. (Normally Hyperbolic Invariant Laminations and diffusive behavior for the generalized Arnold example away from resonances. Preprint available at http://www.terpconnect.umd.edu/vkaloshi/, 2015), applying the results of the present paper, we describe a class of nearly integrable deterministic systems with stochastic diffusive behavior.Oscillatory orbits in the restricted elliptic planar three body problem
http://hdl.handle.net/2117/97768
Oscillatory orbits in the restricted elliptic planar three body problem
Guàrdia Munarriz, Marcel; Martín, Pau; Sabbagh, Lara; Martínez-Seara Alonso, M. Teresa
The restricted planar elliptic three body problem models the motion of a massless body under the Newtonian gravitational force of two other bodies, the primaries, which evolve in Keplerian ellipses.
A trajectory is called oscillatory if it leaves every bounded region but returns infinitely often to some fixed bounded region. We prove the existence of such type of trajectories for any values for the masses of the primaries provided the eccentricity of the Keplerian ellipses is small.
2016-12-05T12:35:52ZGuàrdia Munarriz, MarcelMartín, PauSabbagh, LaraMartínez-Seara Alonso, M. TeresaThe restricted planar elliptic three body problem models the motion of a massless body under the Newtonian gravitational force of two other bodies, the primaries, which evolve in Keplerian ellipses.
A trajectory is called oscillatory if it leaves every bounded region but returns infinitely often to some fixed bounded region. We prove the existence of such type of trajectories for any values for the masses of the primaries provided the eccentricity of the Keplerian ellipses is small.Dimension and codimension of simple games
http://hdl.handle.net/2117/97660
Dimension and codimension of simple games
Kurz, Sascha; Molinero Albareda, Xavier; Olsen, Martin; Serna Iglesias, María José
This paper studies the complexity of computing a representation of a simple game as the intersection (union) of weighted majority games, as well as, the dimension or the codimension. We also present some examples with linear dimension and exponential codimension with respect to the number of players.
2016-12-01T18:56:01ZKurz, SaschaMolinero Albareda, XavierOlsen, MartinSerna Iglesias, María JoséThis paper studies the complexity of computing a representation of a simple game as the intersection (union) of weighted majority games, as well as, the dimension or the codimension. We also present some examples with linear dimension and exponential codimension with respect to the number of players.The self organizing map of neighbour stars and its kinematical interpretation
http://hdl.handle.net/2117/97557
The self organizing map of neighbour stars and its kinematical interpretation
Hernández Pajares, Manuel; Cubarsí Morera, Rafael; Monte Moreno, Enrique
The Self-Organizing Map (SOM) is a neural network algorithm that has the special property ofcreating spatially organized tepresetüatioes of various features of input signals. The resulting maps resemble realneural structures found in the cortices of developed animal brains.: Also, the SOM. has been successful in various pattern recognition tasks involving noisy signals, as for instance, speech recognition and for this reason we are studying its application to some astronomical problems. In this paper w~ present the 2-D mapping and subsequerít study of one local sample of 12000 stars using SOM. The available attributes are 14: 3-D position and velocitiesvphotometric indexes, spectral type and luminosity class. The possible location of halo, thick disk and thin disk stars is discussed. Their kinematical properties are also compared using the velocity distribution moments up to order four.
2016-11-30T16:36:56ZHernández Pajares, ManuelCubarsí Morera, RafaelMonte Moreno, EnriqueThe Self-Organizing Map (SOM) is a neural network algorithm that has the special property ofcreating spatially organized tepresetüatioes of various features of input signals. The resulting maps resemble realneural structures found in the cortices of developed animal brains.: Also, the SOM. has been successful in various pattern recognition tasks involving noisy signals, as for instance, speech recognition and for this reason we are studying its application to some astronomical problems. In this paper w~ present the 2-D mapping and subsequerít study of one local sample of 12000 stars using SOM. The available attributes are 14: 3-D position and velocitiesvphotometric indexes, spectral type and luminosity class. The possible location of halo, thick disk and thin disk stars is discussed. Their kinematical properties are also compared using the velocity distribution moments up to order four.Hydrological soil behavior in areas with semi-arid vegetation (Beni Chougrane Mountains, Algeria)
http://hdl.handle.net/2117/97500
Hydrological soil behavior in areas with semi-arid vegetation (Beni Chougrane Mountains, Algeria)
Boukhari, Yahia; Ginovart Gisbert, Marta; Verdú González, Antoni Maria Claret; Mas Serra, Maite; Mederbal, Khalladi; Josa March, Ramon
2016-11-30T11:51:50ZBoukhari, YahiaGinovart Gisbert, MartaVerdú González, Antoni Maria ClaretMas Serra, MaiteMederbal, KhalladiJosa March, RamonBifurcation diagram for saddle/source bimodal linear dynamical systems
http://hdl.handle.net/2117/97494
Bifurcation diagram for saddle/source bimodal linear dynamical systems
Peña Carrera, Marta; Ferrer Llop, Josep; Susín Sánchez, Antonio
We continue the study of the structural stability and the bifurcations of planar bimodal linear dynamical systems (BLDS) (that is, systems consisting of two linear dynamics acting on each side of a straight line, assuming continuity along the separating line). Here, we enlarge the study of the bifurcation diagram of saddle/spiral BLDS to saddle/source BLDS and in particular we study the position of the homoclinic bifurcation with regard to the new improper node bifurcation
2016-11-30T10:51:47ZPeña Carrera, MartaFerrer Llop, JosepSusín Sánchez, AntonioWe continue the study of the structural stability and the bifurcations of planar bimodal linear dynamical systems (BLDS) (that is, systems consisting of two linear dynamics acting on each side of a straight line, assuming continuity along the separating line). Here, we enlarge the study of the bifurcation diagram of saddle/spiral BLDS to saddle/source BLDS and in particular we study the position of the homoclinic bifurcation with regard to the new improper node bifurcationModelización de crecimientos microbianos en medios heterogéneos y de movilidad reducida
http://hdl.handle.net/2117/97492
Modelización de crecimientos microbianos en medios heterogéneos y de movilidad reducida
Font, Meritxell; Ginovart Gisbert, Marta
En este trabajo se han analizado diversos modelos computacionales publicados en revistas científicas que abordan el estudio del crecimiento microbiano en entornos semisólidos y heterogeneos en superficie, para valorar el interés y utilidad que pueden tener estos modelos en el entorno académico.
2016-11-30T10:34:32ZFont, MeritxellGinovart Gisbert, MartaEn este trabajo se han analizado diversos modelos computacionales publicados en revistas científicas que abordan el estudio del crecimiento microbiano en entornos semisólidos y heterogeneos en superficie, para valorar el interés y utilidad que pueden tener estos modelos en el entorno académico.Pseudo-heteroclinic connections between bicircular restricted four-body problems
http://hdl.handle.net/2117/97491
Pseudo-heteroclinic connections between bicircular restricted four-body problems
Barrabés Vera, Esther; Gomez Muntané, Gerard; Mondelo, Josep Maria; Ollé Torner, Mercè
In this paper, we show a mechanism to explain transport from the outer to the inner Solar system. Such a mechanism is based on dynamical systems theory. More concretely, we consider a sequence of uncoupled bicircular restricted four-body problems –BR4BP –(involving the Sun, Jupiter, a planet and an infinitesimal mass), being the planet Neptune, Uranus and Saturn. For each BR4BP, we compute the dynamical substitutes of the collinear equilibrium points of the corresponding restricted three-body problem (Sun, planet and infinitesimal mass), which become periodic orbits. These periodic orbits are unstable, and the role that their invariant manifolds play in relation with transport from exterior planets to the inner ones is discussed.
2016-11-30T10:28:44ZBarrabés Vera, EstherGomez Muntané, GerardMondelo, Josep MariaOllé Torner, MercèIn this paper, we show a mechanism to explain transport from the outer to the inner Solar system. Such a mechanism is based on dynamical systems theory. More concretely, we consider a sequence of uncoupled bicircular restricted four-body problems –BR4BP –(involving the Sun, Jupiter, a planet and an infinitesimal mass), being the planet Neptune, Uranus and Saturn. For each BR4BP, we compute the dynamical substitutes of the collinear equilibrium points of the corresponding restricted three-body problem (Sun, planet and infinitesimal mass), which become periodic orbits. These periodic orbits are unstable, and the role that their invariant manifolds play in relation with transport from exterior planets to the inner ones is discussed.A sensor fault detection methodology applied to piezoelectric active systems in structural health monitoring applications
http://hdl.handle.net/2117/97387
A sensor fault detection methodology applied to piezoelectric active systems in structural health monitoring applications
Tibaduiza Burgos, Diego Alexander; Anaya Vejar, Maribel; Forero, Edwin; Castro, Rafael; Pozo Montero, Francesc
2016-11-29T10:03:01ZTibaduiza Burgos, Diego AlexanderAnaya Vejar, MaribelForero, EdwinCastro, RafaelPozo Montero, Francesc