Enviament des de DRAC
http://hdl.handle.net/2117/3055
Fri, 20 Jan 2017 07:58:49 GMT2017-01-20T07:58:49ZIBC n-type C-Si solar cells based on laser doping processing for selective emitter and base contact formation
http://hdl.handle.net/2117/99732
IBC n-type C-Si solar cells based on laser doping processing for selective emitter and base contact formation
Masmitjà Rusiñol, Gerard; Ortega Villasclaras, Pablo Rafael; Martín García, Isidro; López Rodríguez, Gema; Voz Sánchez, Cristóbal; Alcubilla González, Ramón
Thu, 19 Jan 2017 18:19:54 GMThttp://hdl.handle.net/2117/997322017-01-19T18:19:54ZMasmitjà Rusiñol, GerardOrtega Villasclaras, Pablo RafaelMartín García, IsidroLópez Rodríguez, GemaVoz Sánchez, CristóbalAlcubilla González, RamónStable multicolor periodic-wave arrays
http://hdl.handle.net/2117/99730
Stable multicolor periodic-wave arrays
Kartashov, Yaroslav V.; Egorov, A A; Zelenina, A S; Vysloukh, Victor A.; Torner Sabata, Lluís
We study the existence and stability of periodic-wave arrays propagating in uniform quadratic nonlinear media and discover that they become completely stable above a threshold light intensity. To the best of our knowledge, this is the first example in physics of completely stable periodic-wave patterns propagating in conservative uniform media supporting bright solitons.
Thu, 19 Jan 2017 17:52:20 GMThttp://hdl.handle.net/2117/997302017-01-19T17:52:20ZKartashov, Yaroslav V.Egorov, A AZelenina, A SVysloukh, Victor A.Torner Sabata, LluísWe study the existence and stability of periodic-wave arrays propagating in uniform quadratic nonlinear media and discover that they become completely stable above a threshold light intensity. To the best of our knowledge, this is the first example in physics of completely stable periodic-wave patterns propagating in conservative uniform media supporting bright solitons.Observation of self-trapping of light in walk-off compensating tandems
http://hdl.handle.net/2117/99729
Observation of self-trapping of light in walk-off compensating tandems
Carrasco Rodríguez, Sílvia; Petrov, D V; Pérez Torres, Juan; Torner Sabata, Lluís; Kim, H; Stegeman, G I; Zondy, J J
We report the first experimental observation, to our knowledge, of the self-trapping of light in walk-off-compensating optical tandems. The experiment was conducted with picosecond light pulses in a ten-plate optically contacted tandem made of potassium titanyl phosphate prepared for phase matching along a special geometry featuring a huge local walk-off. The observation should open the door to the exploration of multicomponent soliton formation in new classes of materials and settings.
Thu, 19 Jan 2017 17:49:18 GMThttp://hdl.handle.net/2117/997292017-01-19T17:49:18ZCarrasco Rodríguez, SílviaPetrov, D VPérez Torres, JuanTorner Sabata, LluísKim, HStegeman, G IZondy, J JWe report the first experimental observation, to our knowledge, of the self-trapping of light in walk-off-compensating optical tandems. The experiment was conducted with picosecond light pulses in a ten-plate optically contacted tandem made of potassium titanyl phosphate prepared for phase matching along a special geometry featuring a huge local walk-off. The observation should open the door to the exploration of multicomponent soliton formation in new classes of materials and settings.Quasi-phase-matching engineering for spatial control of entangled two-photon states
http://hdl.handle.net/2117/99728
Quasi-phase-matching engineering for spatial control of entangled two-photon states
Pérez Torres, Juan; Alexandescu, A; Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís
We show that transverse engineering of quasi-phase-matched geometries can be used to tailor the spatial mode function that describes the quantum state of photon pairs generated in spontaneous parametric downconversion. We study several geometries and reveal how properly engineered gratings affect, in particular, the spatial correlations embedded in two-photon entangled states.
Thu, 19 Jan 2017 17:44:33 GMThttp://hdl.handle.net/2117/997282017-01-19T17:44:33ZPérez Torres, JuanAlexandescu, ACarrasco Rodríguez, SílviaTorner Sabata, LluísWe show that transverse engineering of quasi-phase-matched geometries can be used to tailor the spatial mode function that describes the quantum state of photon pairs generated in spontaneous parametric downconversion. We study several geometries and reveal how properly engineered gratings affect, in particular, the spatial correlations embedded in two-photon entangled states.Spatial soliton switching in quasi-continuous optical arrays
http://hdl.handle.net/2117/99727
Spatial soliton switching in quasi-continuous optical arrays
Kartashov, Yaroslav V.; Zelenina, A S; Torner Sabata, Lluís; Vysloukh, Victor A.
We report on the phenomenon of trapping and switching of one-dimensional spatial solitons in Kerr-type nonlinear media with transverse periodic modulation of the refractive index. The solitons slowly radiate upon propagation along the periodic structure and are finally trapped in one of its guiding channels. The position of the output channel can be varied by small changes in the launching angle.
Thu, 19 Jan 2017 17:38:10 GMThttp://hdl.handle.net/2117/997272017-01-19T17:38:10ZKartashov, Yaroslav V.Zelenina, A STorner Sabata, LluísVysloukh, Victor A.We report on the phenomenon of trapping and switching of one-dimensional spatial solitons in Kerr-type nonlinear media with transverse periodic modulation of the refractive index. The solitons slowly radiate upon propagation along the periodic structure and are finally trapped in one of its guiding channels. The position of the output channel can be varied by small changes in the launching angle.Eigenvalue control and switching by fission of multisoliton bound states in planar waveguides
http://hdl.handle.net/2117/99726
Eigenvalue control and switching by fission of multisoliton bound states in planar waveguides
Aleshkevich, V A; Kartashov, Yaroslav V.; Zelenina, A S; Vysloukh, Victor A.; Pérez Torres, Juan; Torner Sabata, Lluís
We report the results of numerical studies of the fission of ¿-soliton bound states at the interface formed by a Kerr nonlinear medium and a linear dielectric in a planar waveguide. A variety of effects are shown to occur, with applications to all-optical eigenvalue soliton control.
Thu, 19 Jan 2017 17:35:14 GMThttp://hdl.handle.net/2117/997262017-01-19T17:35:14ZAleshkevich, V AKartashov, Yaroslav V.Zelenina, A SVysloukh, Victor A.Pérez Torres, JuanTorner Sabata, LluísWe report the results of numerical studies of the fission of ¿-soliton bound states at the interface formed by a Kerr nonlinear medium and a linear dielectric in a planar waveguide. A variety of effects are shown to occur, with applications to all-optical eigenvalue soliton control.Multicolor lattice solitons
http://hdl.handle.net/2117/99724
Multicolor lattice solitons
Kartashov, Yaroslav V.; Torner Sabata, Lluís; Vysloukh, Victor A.
We report on the existence of multicolor solitons supported by periodic lattices made from quadratic nonlinear media. Such lattice solitons bridge the gap between continuous solitons in uniform media and discrete solitons in strongly localized systems and exhibit a wealth of new features. We discovered that, in contrast to uniform media, multipeaked lattice solitons are stable. Thus they open new opportunities for all-optical switching based on soliton packets.
Thu, 19 Jan 2017 17:18:44 GMThttp://hdl.handle.net/2117/997242017-01-19T17:18:44ZKartashov, Yaroslav V.Torner Sabata, LluísVysloukh, Victor A.We report on the existence of multicolor solitons supported by periodic lattices made from quadratic nonlinear media. Such lattice solitons bridge the gap between continuous solitons in uniform media and discrete solitons in strongly localized systems and exhibit a wealth of new features. We discovered that, in contrast to uniform media, multipeaked lattice solitons are stable. Thus they open new opportunities for all-optical switching based on soliton packets.Compact Hausdorff group topologies for the additive group of real numbers
http://hdl.handle.net/2117/99723
Compact Hausdorff group topologies for the additive group of real numbers
Bruguera Padró, Mª Montserrat; Martín-Peinador, Elena
This volume contains the contributions presented by several colleagues as a tribute
to the mathematical and human qualities of Jos e Mar a Montesinos Amilibia on the
occasion of his seventieth birthday. The editors would like to express their thanks
to the contributors and their very especial gratitude to Jos e Mar a for his example
through many years of scienti c and personal contact; We deal with an example of a topology for the additive group of real numbers
R, which makes it a compact Hausdor topological group. Further, (R; ) is
connected, but neither arcwise connected, nor locally connected. Thus, it is nei-
ther a Lie group, nor a curve in the sense of H. Mazurkiewicz. The contribution
of this short note is to provide an elementary proof of the fact that it is not
arcwise connected.
Thu, 19 Jan 2017 16:53:30 GMThttp://hdl.handle.net/2117/997232017-01-19T16:53:30ZBruguera Padró, Mª MontserratMartín-Peinador, ElenaThis volume contains the contributions presented by several colleagues as a tribute
to the mathematical and human qualities of Jos e Mar a Montesinos Amilibia on the
occasion of his seventieth birthday. The editors would like to express their thanks
to the contributors and their very especial gratitude to Jos e Mar a for his example
through many years of scienti c and personal contact
We deal with an example of a topology for the additive group of real numbers
R, which makes it a compact Hausdor topological group. Further, (R; ) is
connected, but neither arcwise connected, nor locally connected. Thus, it is nei-
ther a Lie group, nor a curve in the sense of H. Mazurkiewicz. The contribution
of this short note is to provide an elementary proof of the fact that it is not
arcwise connected.Reentry and ectopic pacemakers emerge in a three-dimensional model for a slab of cardiac tissue with diffuse microfibrosis near the percolation threshold
http://hdl.handle.net/2117/99721
Reentry and ectopic pacemakers emerge in a three-dimensional model for a slab of cardiac tissue with diffuse microfibrosis near the percolation threshold
Alonso Muñoz, Sergio; Weber dos Santos, Rodrigo; Bär, Markus
Arrhythmias in cardiac tissue are generally associated with irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. Recently, it was shown in simulations of two-dimensional (2D) discrete models of cardiac tissue that a wave crossing a fibrotic, heterogeneous region may produce reentry and transient or persistent ectopic activity provided the fraction of conducting connections is just above the percolation threshold. Here, we investigate the occurrence of these phenomena in three-dimensions by simulations of a discrete model representing a thin slab of cardiac tissue. This is motivated (i) by the necessity to study the relevance and properties of the percolation-related mechanism for the emergence of microreentries in three dimensions and (ii) by the fact that atrial tissue is quite thin in comparison with ventricular tissue. Here, we simplify the model by neglecting details of tissue anatomy, e. g. geometries of atria or ventricles and the anisotropy in the conductivity. Hence, our modeling study is confined to the investigation of the effect of the tissue thickness as well as to the comparison of the dynamics of electrical excitation in a 2D layer with the one in a 3D slab. Our results indicate a strong and non-trivial effect of the thickness even for thin tissue slabs on the probability of microreentries and ectopic beat generation. The strong correlation of the occurrence of microreentry with the percolation threshold reported earlier in 2D layers persists in 3D slabs. Finally, a qualitative agreement of 3D simulated electrograms in the fibrotic region with the experimentally observed complex fractional atrial electrograms (CFAE) as well as strong difference between simulated electrograms in 2D and 3D were found for the cases where reentry and ectopic activity were triggered by the micro-fibrotic region.
Thu, 19 Jan 2017 15:33:38 GMThttp://hdl.handle.net/2117/997212017-01-19T15:33:38ZAlonso Muñoz, SergioWeber dos Santos, RodrigoBär, MarkusArrhythmias in cardiac tissue are generally associated with irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. Recently, it was shown in simulations of two-dimensional (2D) discrete models of cardiac tissue that a wave crossing a fibrotic, heterogeneous region may produce reentry and transient or persistent ectopic activity provided the fraction of conducting connections is just above the percolation threshold. Here, we investigate the occurrence of these phenomena in three-dimensions by simulations of a discrete model representing a thin slab of cardiac tissue. This is motivated (i) by the necessity to study the relevance and properties of the percolation-related mechanism for the emergence of microreentries in three dimensions and (ii) by the fact that atrial tissue is quite thin in comparison with ventricular tissue. Here, we simplify the model by neglecting details of tissue anatomy, e. g. geometries of atria or ventricles and the anisotropy in the conductivity. Hence, our modeling study is confined to the investigation of the effect of the tissue thickness as well as to the comparison of the dynamics of electrical excitation in a 2D layer with the one in a 3D slab. Our results indicate a strong and non-trivial effect of the thickness even for thin tissue slabs on the probability of microreentries and ectopic beat generation. The strong correlation of the occurrence of microreentry with the percolation threshold reported earlier in 2D layers persists in 3D slabs. Finally, a qualitative agreement of 3D simulated electrograms in the fibrotic region with the experimentally observed complex fractional atrial electrograms (CFAE) as well as strong difference between simulated electrograms in 2D and 3D were found for the cases where reentry and ectopic activity were triggered by the micro-fibrotic region.Noncommutative integrable systems on b-symplectic manifolds
http://hdl.handle.net/2117/99720
Noncommutative integrable systems on b-symplectic manifolds
Miranda Galcerán, Eva; Kiesenhoferb, Anna
In this paper we study noncommutative integrable systems on b-Poisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an action-angle theorem for noncommutative integrable systems on a b-symplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the b-symplectic structure.
Thu, 19 Jan 2017 15:20:40 GMThttp://hdl.handle.net/2117/997202017-01-19T15:20:40ZMiranda Galcerán, EvaKiesenhoferb, AnnaIn this paper we study noncommutative integrable systems on b-Poisson manifolds. One important source of examples (and motivation) of such systems comes from considering noncommutative systems on manifolds with boundary having the right asymptotics on the boundary. In this paper we describe this and other examples and prove an action-angle theorem for noncommutative integrable systems on a b-symplectic manifold in a neighborhood of a Liouville torus inside the critical set of the Poisson structure associated to the b-symplectic structure.