UPCommonsUPCommons, el portal d'accés obert al coneixement de la UPC, està format pel conjunt de dipòsits institucionals oberts de la UPC i té com a missió garantir la preservació de la producció docent i de recerca cientificotècnica de la Universitat, maximitzant-ne la visibilitat i, conseqüentment, incrementant-ne l’impacte en la docència i la recerca de tot el món.http://upcommons.upc.edu2017-01-16T19:01:55Z2017-01-16T19:01:55ZComplex soliton-like pattern generation in potassium niobate due to noisy, high intensity, input beamsJankovic, LPolyakov, SStegeman, GCarrasco Rodríguez, SílviaTorner Sabata, LluísBosshard, ChGunter, Phttp://hdl.handle.net/2117/993782017-01-16T18:53:11Z2017-01-16T18:53:11ZComplex soliton-like pattern generation in potassium niobate due to noisy, high intensity, input beams
Jankovic, L; Polyakov, S; Stegeman, G; Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís; Bosshard, Ch; Gunter, P
We report the generation of complex soliton-like patterns in non-critically-phase-matched potassium niobate which occur in random spatial patterns from shot-to-shot. Up to five spots have been generated at input intensities of 10’s GW/cm2, many times the single soliton threshold. The mechanism which leads to the symmetry breaking required for the complex patterns is interpreted to be random noise imprinted on the input light.
2017-01-16T18:53:11ZJankovic, LPolyakov, SStegeman, GCarrasco Rodríguez, SílviaTorner Sabata, LluísBosshard, ChGunter, PWe report the generation of complex soliton-like patterns in non-critically-phase-matched potassium niobate which occur in random spatial patterns from shot-to-shot. Up to five spots have been generated at input intensities of 10’s GW/cm2, many times the single soliton threshold. The mechanism which leads to the symmetry breaking required for the complex patterns is interpreted to be random noise imprinted on the input light.The construction of the territory of IbizaCortellaro, Stefanohttp://hdl.handle.net/2117/993772017-01-16T18:51:40Z2017-01-16T18:51:40ZThe construction of the territory of Ibiza
Cortellaro, Stefano
2017-01-16T18:51:40ZCortellaro, StefanoFill Rate Estimation in Periodic Review Policies with Lost Sales Using Simple MethodsCardós, ManuelGuijarro, EsterBabiloni Griñón, María Eugeniahttp://hdl.handle.net/2117/993762017-01-16T18:46:33Z2017-01-16T18:45:58ZFill Rate Estimation in Periodic Review Policies with Lost Sales Using Simple Methods
Cardós, Manuel; Guijarro, Ester; Babiloni Griñón, María Eugenia
Purpose: The exact estimation of the fill rate in the lost sales case is complex and time
consuming. However, simple and suitable methods are needed for its estimation so that inventory
managers could use them.
Design/methodology/approach: Instead of trying to compute the fill rate in one step, this
paper focuses first on estimating the probabilities of different on-hand stock levels so that the fill
rate is computed later.
Findings: As a result, the performance of a novel proposed method overcomes the other
methods and is relatively simple to compute.
Originality/value: Existing methods for estimating stock levels are examined, new procedures
are proposed and their performance is assessed.
2017-01-16T18:45:58ZCardós, ManuelGuijarro, EsterBabiloni Griñón, María EugeniaPurpose: The exact estimation of the fill rate in the lost sales case is complex and time
consuming. However, simple and suitable methods are needed for its estimation so that inventory
managers could use them.
Design/methodology/approach: Instead of trying to compute the fill rate in one step, this
paper focuses first on estimating the probabilities of different on-hand stock levels so that the fill
rate is computed later.
Findings: As a result, the performance of a novel proposed method overcomes the other
methods and is relatively simple to compute.
Originality/value: Existing methods for estimating stock levels are examined, new procedures
are proposed and their performance is assessed.Robust soliton clusters in media with competing cubic and quintic nonlinearitiesMihalache, DumitruMazilu, DCrasovan, L.C.Malomed, Boris A.Lederer, FTorner Sabata, Lluíshttp://hdl.handle.net/2117/993752017-01-16T18:44:10Z2017-01-16T18:44:10ZRobust soliton clusters in media with competing cubic and quintic nonlinearities
Mihalache, Dumitru; Mazilu, D; Crasovan, L.C.; Malomed, Boris A.; Lederer, F; Torner Sabata, Lluís
Systematic results are reported for dynamics of circular patterns (“necklaces”), composed of fundamental solitons and carrying orbital angular momentum, in the two-dimensional model, which describes the propagation of light beams in bulk media combining self-focusing cubic and self-defocusing quintic nonlinearities. Semianalytical predictions for the existence of quasistable necklace structures are obtained on the basis of an effective interaction potential. Then, direct simulations are run. In the case when the initial pattern is far from an equilibrium size predicted by the potential, it cannot maintain its shape. However, a necklace with the initial shape close to the predicted equilibrium survives very long evolution, featuring persistent oscillations. The quasistable evolution is not essentially disturbed by a large noise component added to the initial configuration. Basic conclusions concerning the necklace dynamics in this model are qualitatively the same as in a recently studied one which combines quadratic and self-defocusing cubic nonlinearities. Thus, we infer that a combination of competing self-focusing and self-defocusing nonlinearities enhances the robustness not only of vortex solitons but also of vorticity-carrying necklace patterns.
2017-01-16T18:44:10ZMihalache, DumitruMazilu, DCrasovan, L.C.Malomed, Boris A.Lederer, FTorner Sabata, LluísSystematic results are reported for dynamics of circular patterns (“necklaces”), composed of fundamental solitons and carrying orbital angular momentum, in the two-dimensional model, which describes the propagation of light beams in bulk media combining self-focusing cubic and self-defocusing quintic nonlinearities. Semianalytical predictions for the existence of quasistable necklace structures are obtained on the basis of an effective interaction potential. Then, direct simulations are run. In the case when the initial pattern is far from an equilibrium size predicted by the potential, it cannot maintain its shape. However, a necklace with the initial shape close to the predicted equilibrium survives very long evolution, featuring persistent oscillations. The quasistable evolution is not essentially disturbed by a large noise component added to the initial configuration. Basic conclusions concerning the necklace dynamics in this model are qualitatively the same as in a recently studied one which combines quadratic and self-defocusing cubic nonlinearities. Thus, we infer that a combination of competing self-focusing and self-defocusing nonlinearities enhances the robustness not only of vortex solitons but also of vorticity-carrying necklace patterns.Metastability of dark snoidal-type waves in quadrayic nonlinear mediaKartashov, Yaroslav V.Egorov, A AZelenina, A SVysloukh, Victor A.Torner Sabata, Lluíshttp://hdl.handle.net/2117/993742017-01-16T18:40:16Z2017-01-16T18:40:16ZMetastability of dark snoidal-type waves in quadrayic nonlinear media
Kartashov, Yaroslav V.; Egorov, A A; Zelenina, A S; Vysloukh, Victor A.; Torner Sabata, Lluís
We report the existence and basic properties of dark snoidal-type waves self-sustained in quadratic nonlinear media. Using a stability analysis technique, we reveal that they are almost completely stable, or metastable, in suitable ranges of input energy flows and material parameters. This opens the way to the experimental observation of dark-type multicolor periodic wave patterns supported by quadratic nonlinearities.
2017-01-16T18:40:16ZKartashov, Yaroslav V.Egorov, A AZelenina, A SVysloukh, Victor A.Torner Sabata, LluísWe report the existence and basic properties of dark snoidal-type waves self-sustained in quadratic nonlinear media. Using a stability analysis technique, we reveal that they are almost completely stable, or metastable, in suitable ranges of input energy flows and material parameters. This opens the way to the experimental observation of dark-type multicolor periodic wave patterns supported by quadratic nonlinearities.Quantum spiral bandwidth of entangled two-photon statesPérez Torres, JuanAlexandrescu, ATorner Sabata, Lluíshttp://hdl.handle.net/2117/993732017-01-16T18:35:44Z2017-01-16T18:35:44ZQuantum spiral bandwidth of entangled two-photon states
Pérez Torres, Juan; Alexandrescu, A; Torner Sabata, Lluís
We put forward the concept of quantum spiral bandwidth of the spatial mode function of the two-photon entangled state generated in spontaneous parametric down-conversion. We obtain the bandwidth using the eigenstates of the orbital angular momentum of the biphoton states, and reveal its dependence with the length of the down-converting crystals and waist of the pump beam. The connection between the quantum spiral bandwidth and the entropy of entanglement of the quantum state is discussed.
2017-01-16T18:35:44ZPérez Torres, JuanAlexandrescu, ATorner Sabata, LluísWe put forward the concept of quantum spiral bandwidth of the spatial mode function of the two-photon entangled state generated in spontaneous parametric down-conversion. We obtain the bandwidth using the eigenstates of the orbital angular momentum of the biphoton states, and reveal its dependence with the length of the down-converting crystals and waist of the pump beam. The connection between the quantum spiral bandwidth and the entropy of entanglement of the quantum state is discussed.Can Deu. Historia y arquitecturaLaborda Herranz, Telmahttp://hdl.handle.net/2117/993722017-01-16T18:33:57Z2017-01-16T18:33:57ZCan Deu. Historia y arquitectura
Laborda Herranz, Telma
2017-01-16T18:33:57ZLaborda Herranz, TelmaOrbital angular momentum of photons in noncollinear parametric downconversionMolina Terriza, GabrielPérez Torres, JuanTorner Sabata, Lluíshttp://hdl.handle.net/2117/993712017-01-16T18:31:24Z2017-01-16T18:31:24ZOrbital angular momentum of photons in noncollinear parametric downconversion
Molina Terriza, Gabriel; Pérez Torres, Juan; Torner Sabata, Lluís
Conservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.
2017-01-16T18:31:24ZMolina Terriza, GabrielPérez Torres, JuanTorner Sabata, LluísConservation of the orbital angular momentum (OAM) of light in photon downconversion has been observed experimentally in nearly collinear phase-matching geometries, where the pump, signal and idler photons propagate along almost the same direction [Nature 412 (2001) 313]. However, here we predict that such paraxial measurements conducted with entangled photons in noncollinear geometries are not expected to comply with OAM conservation in the above sense. Under proper conditions, the strength of such apparent anomaly approaches 100%. We discuss the physical origin of the effect and suggest experimental schemes where it can be verified.Special Issue: Building Bridges between Researchers and PractitionersSantos, JavierViles, Elisabethhttp://hdl.handle.net/2117/993702017-01-16T18:39:16Z2017-01-16T18:29:25ZSpecial Issue: Building Bridges between Researchers and Practitioners
Santos, Javier; Viles, Elisabeth
This special issue of the Journal of Industrial Engineering and Management is focused on the most recent and relevant research, theories and practices in Industrial Engineering and Operations Management presented at the International Joint Conference (IJC2016).
This International Joint Conference is a result of an agreement between ADINGOR (Asociación para el desarrollo de la Ingeniería de Organización), ABEPRO (Associaçâo Brasileira de Engenharia de Produçâo), IISE (Institute of Industrial & Systems Engineers) and AIM (European Academy for Industrial Management). The conference was organised by the Industrial Management Department at Tecnun (School of Engineering – University of Navarra).
2017-01-16T18:29:25ZSantos, JavierViles, ElisabethThis special issue of the Journal of Industrial Engineering and Management is focused on the most recent and relevant research, theories and practices in Industrial Engineering and Operations Management presented at the International Joint Conference (IJC2016).
This International Joint Conference is a result of an agreement between ADINGOR (Asociación para el desarrollo de la Ingeniería de Organización), ABEPRO (Associaçâo Brasileira de Engenharia de Produçâo), IISE (Institute of Industrial & Systems Engineers) and AIM (European Academy for Industrial Management). The conference was organised by the Industrial Management Department at Tecnun (School of Engineering – University of Navarra).Quadratic soliton self-reflection at a quadratically nonlinear interfaceJankovic, LKim, HStegeman, G ICarrasco Rodríguez, SílviaTorner Sabata, LluísKatz, Mhttp://hdl.handle.net/2117/993692017-01-16T18:27:27Z2017-01-16T18:27:27ZQuadratic soliton self-reflection at a quadratically nonlinear interface
Jankovic, L; Kim, H; Stegeman, G I; Carrasco Rodríguez, Sílvia; Torner Sabata, Lluís; Katz, M
The reflection of bulk quadratic solutions incident onto a quadratically nonlinear interface in periodically poled potassium titanyl phosphate was observed. The interface consisted of the boundary between two quasi-phase-matched regions displaced from each other by a half-period. At high intensities and small angles of incidence the soliton is reflected.
2017-01-16T18:27:27ZJankovic, LKim, HStegeman, G ICarrasco Rodríguez, SílviaTorner Sabata, LluísKatz, MThe reflection of bulk quadratic solutions incident onto a quadratically nonlinear interface in periodically poled potassium titanyl phosphate was observed. The interface consisted of the boundary between two quasi-phase-matched regions displaced from each other by a half-period. At high intensities and small angles of incidence the soliton is reflected.