Exploració per tema "Dispersion"

Ara es mostren els items 1-20 de 40

    • A new general method to compute dispersion errors on Cartesian stretched meshes for both linear and non-linear operators 

      Ruano Pérez, Jesús; Baez Vidal, Aleix; Rigola Serrano, Joaquim; Trias Miquel, Francesc Xavier (2022-02-01)
      Article
      Accés restringit per política de l'editorial
      The present article presents a new analysis for the dispersion error and the methodology to evaluate it numerically. Here we present the spectral properties of several convective schemes, including non-linear ones, on ...

    • An equivalent model for lateral modes on the H2 response of bulk acoustic wave resonators 

      Udaondo Guerrero, Carlos; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; García Pastor, David (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      An equivalent circuital model is proposed for the lateral modes of a BAW resonator. It is based in the Mason model, adding a dispersive a transmission line to model the Lamb waves along the lateral dimensions of the ...

    • An explicit method for modeling lossy and dispersive transmission lines 

      Palà Schönwälder, Pere; Miró Sans, Joan Maria (Microwave Exhibitions and Publishers, 1993)
      Text en actes de congrés
      Accés obert
      In this paper, an explicit -non iterative- method for modeling lossy and dispersive transmission lines, allowing the inclusion of skin-effect parameters is described. This method, based on multipoint Padé approximation, ...

    • Analysis of border ring modes on SMR-BAW resonators 

      Udaondo Guerrero, Carlos; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      An equivalent circuit model is proposed in order to model the Border Ring (BR) spurious modes on Type I Solidly Mounted Resonators (SMR) BAW resonators and the cancellation of the in-band lateral modes that the BR frame ...

    • Assessment of aquaculture rafts exposure at river-borne substances using numerical modelling 

      Chen, Yang; Grifoll Colls, Manel; Espino Infantes, Manuel; Fernández Tejedor, Margarita; Fernández-Pedrera Balsells, Marta; Sánchez-Arcilla Conejo, Agustín (2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Coastal bays and estuaries with aquaculture activity may show spatial variability on the exposure at river-borne substances such as nutrients, pesticides or pollutants. In function of the relative geographical position of ...

    • Áreas Metropolitanas de Belém e Brasília: novos recortes para análise 

      Bitencourt, Ricardo Batista; Gomes, Ramon Fortunato (Departament d’Urbanisme i Ordenació del Territori. Universitat Politècnica de Catalunya / Facultad de Arquitectura, Urbanismo y Diseño de la Universidad Nacional de Córdoba, 2018-06)
      Text en actes de congrés
      Accés obert
      No cenário globalizado das cidades contemporâneas, das trinta e cinco áreas metropolitanas brasileiras, grande parte definidas sob a égide da Constituição Federal de 1988, emergem dois tipos de metrópoles: as funcionais e ...

    • Cavity solitons in a microring dimer with gain and loss 

      Milián, Carles; Kartashov, Yaroslav V.; Skryabin, Dmitry V.; Torner Sabata, Lluís (2018-02-20)
      Article
      Accés obert
      We address a pair of vertically coupled microring resonators with gain and loss pumped by a single-frequency field. Coupling between microrings results in a twofold splitting of the single microring resonance that increases ...

    • Comparison of expansion-based explicit time-integration schemes for acoustic wave propagation 

      Spa, Carlos; Rojas, Otilio; Puente, Josep de la (Society of Exploration Geophysicists, 2020-04-14)
      Article
      Accés obert
      We have developed a von Neumann stability and dispersion analysis of two time-integration techniques in the framework of Fourier pseudospectral (PS) discretizations of the second-order wave equation. The first technique ...

    • Damage regularisation with inertia gradients 

      Bennett, Terry; Rodríguez Ferran, Antonio; Askes, Harm (2012-01-01)
      Article
      Accés obert
      A gradient enhanced model is formulated which simulates micro-structurally induced wave dispersion and is capable of achieving mesh objective results when modelling strain-softening materials. Length scale parameters are ...

    • Design and optimization of Photonic Systems for Microwave Applications 

      Nuño Gómez, Daniel-Juan (Universitat Politècnica de Catalunya, 2017-09-07)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Institut de Ciències Fotòniques (ICFO) / Universitat de Barcelona / Universitat Autònoma de Barcelona
      Extensively researched in the last years, the Microwave Photonics Technology field has a number of potential advantages including extremely wide bandwidth, very low frequency constant losses, light weight, immunity to EMI ...

    • Dispersive tourism and camouflage 

      Berc, Dafne; Basauri, Luciano (International Forum on Urbanism / Escola Técnica Superior d'Arquitectura de Barcelona, 2012-01)
      Text en actes de congrés
      Accés obert
      Departing from and elaborating on the argument that mass tourism is constituted by a series of paradoxes rather than inconsistencies, planning and architecture stand restricted in solving tourism’s detrimental effects to ...

    • Effect of collisions on the particle behavior in a turbulent square duct flow 

      Zhang, Hao; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio; Yang, Dongmin; Tan, Yuanqiang; Sheng, Yong (2015-01-01)
      Article
      Accés restringit per política de l'editorial
      The effect of collisions on the particle behavior in a fully developed turbulent flow in a straight square duct at Re-r = 300 is numerically investigated. The hydrodynamic modeling of the fluid phase is based on direct ...

    • Estudio de la estabilidad y dispersión del problema de propagación de ondas sísmicas en 2-D utilizando el método de diferencias finitas generalizadas 

      Ureña Prieto, Francisco; Benito Muñoz, Juan José; Gavete Corvinos, Luis; Salete Casino, Eduardo; Casasús Acevedo, Álvaro (Universitat Politècnica de Catalunya. CIMNE, 2011)
      Article
      Accés obert
      Este artículo muestra la resolución del problema de propagación de ondas sísmicas en 2-D, mediante la utilización de esquemas explícitos en diferencias finitas generalizadas (GFD), lo que permite la utilización de mallas ...

    • Expansión urbana en ciudades intermedias de crecimiento demográfico bajo: el caso de Bahía Blanca, Argentina 

      Urriza, Guillermina (Departament d’Urbanisme i Ordenació del Territori. Universitat Politècnica de Catalunya / Facultad de Arquitectura, Urbanismo y Diseño de la Universidad Nacional de Córdoba, 2018-06)
      Text en actes de congrés
      Accés obert
      En las últimas décadas se observan procesos de extensión de la superficie urbana de modo disperso y en baja densidad en la periferia de ciudades intermedias, que requieren ser explicados desde la particularidad de sus ...

    • Flat focusing mirrors 

      Staliunas, Kestutis; Cheng, Yu-Chiech; Kicas, Simonas; Trull Silvestre, José Francisco; Cojocaru, Crina; Peckus, Martynas; Vilaseca Alavedra, Ramon; Drazdys, Ramutis (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      We present the flat focusing mirror - the dielectric mirrors capable to focus and image the narrow beams in reflections. The mirrors are flat, and transversally invariant, i.e. have no optical axis. We consider two different ...

    • Indicies de movilidad urbana orientados a la sostenibilidad en las capitales de la región sur de Brasil 

      Michel Fuga, Tânia; Neckel, Alcindo; Kujawa, Henrique Aniceto; Oliveira, Marcos; Murillo Acosta, Michel Johana (DUOT, UPC, 2020-09-28)
      Text en actes de congrés
      Accés obert
      Con la creciente de los problemas desdoblados por las altas tasas de motorización individual, aliados a la expansión de las ciudades y el crecimiento poblacional, se hace importante la comprensión de los desplazamientos ...

    • Influencia del número de elementos reemisores en el modelado de difusores durante la etapa de optimización 

      Blanco Nieto, Patricia; Arasa Marti, Jose (2016-06)
      Article
      Accés obert
      En el marco de trabajo del diseño óptico, el fenómeno de la difusión normalmente queda relegado a la fase final del estudio de tolerancias, momento en el que se valora su influencia en el sismtea ya diseñado. El hecho de ...

    • Ionospheric signal propagation simulator for earth observation missions 

      Fernández Niño, Elena; Molina Ordóñez, Carlos; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés obert
      Following the discovery of the ionosphere by Marconi in 1901, different disciplines have been influenced from the ionospheric effects on radio-waves, such as communications or Earth Observation missions. The ionosphere ...

    • Metal-insulator-metal capacitor using electrosprayed nanoparticles 

      Véliz Noboa, Bremnen Marino; Bermejo Broto, Sandra; Coll Valentí, Arnau; Castañer Muñoz, Luis María (2014-07-07)
      Article
      Accés restringit per política de l'editorial
      An electrospray technique has been used to deposit SiO2 nanoparticles as insulator layer of a metal-insulator-metal device. Impedance spectroscopy measurements show that a 4.4 factor increase in capacitance is achieved ...

    • Métodos avanzados para la medida de la dispersión cromática a frecuencias ópticas 

      Sarabia Díaz, Eugenia Teresa (Universitat Politècnica de Catalunya, 2011-09-28)
      Projecte/Treball Final de Carrera
      Accés obert
      English: Advanced Methods for the Measurement of Chromatic Dispersion at Optical Frequencies. To use the methods, we must first study the phenomenon of dispersion, and how we see the effect it has on the phase and envelope ...