Ara es mostren els items 1919-1938 de 93814

  • A field study on the fusion of terrestrial and satellite location methods in urban cellular networks 

    Barceló Arroyo, Francisco; Martín Escalona, Israel; Manente, Cyrille (2010-05-01)
    Article
    Accés restringit per política de l'editorial
    This work studies the improvement in service coverage obtained by three different approaches to combining two triangulation (terrestrial and satellite) location methods for cellular networks in an urban environment. The ...
  • A field study with primary school children on perception of social presence and interactive behavior with a pet robot 

    Heerink, Marcel; Díaz Boladeras, Marta; Albo-Canals, Jordi; Angulo Bahón, Cecilio; Barco, Alex; Casacuberta Bagó, Judit; Garriga Berga, Carles (2012)
    Comunicació de congrés
    Accés obert
    This paper presents a study on measuring (1) how children experience a pet robot, (2) how they play with it and (3) how children’s perceptions on and interaction with pet robots are interrelated. The study features different ...
  • A field test of a linear stability model for crescentic bars 

    Tiessen, M.C.H.; Leeuwen, S.M.Van; Calvete Manrique, Daniel; Dodd, Nicholas (2010-01)
    Article
    Accés restringit per política de l'editorial
    A morphodynamical linear stability analysis is used to predict the natural development of crescentic bed patterns and rip channels. The purpose is to investigate whether this technique, which is useful for understanding ...
  • A figure-of-merit for pattern reconfigurable antennas 

    Rodrigo López, Daniel; Romeu Robert, Jordi; Capdevila Cascante, Santiago; Jofre Roca, Lluís (2013-03)
    Article
    Accés restringit per política de l'editorial
    The performance of pattern reconfigurable antennas is evaluated with the purpose of deriving a figure-of-merit for pattern reconfigurability. A general formulation is provided for the average gain achieved by a ...
  • A filtered kinetic energy preserving finite volumes scheme for compressible flows 

    Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
    Text en actes de congrés
    Accés obert
    The Kinetic Energy Preserving Scheme (KEP) for compressible flows has been shown to solve 1-D shock waves without smearing them. The method does not add numerical diffusion to solutions but, as a counterpart, it needs ...
  • A filtering engine for large conceptual schemas 

    Villegas Niño, Antonio (Universitat Politècnica de Catalunya, 2013-01-29)
    Tesi
    Accés obert
  • A finite deformation membrane based on inter-atomic potentials for the transverse mechanics of nanotubes 

    Arroyo Balaguer, Marino; Belytschko, T. (2003-03)
    Article
    Accés obert
    A finite deformation hyper-elastic membrane theory based on inter-atomic potentials for crystalline films composed of a single atomic layer is developed. For this purpose, an extension of the standard Born rule that exploits ...
  • A finite difference based tool for analysing ground source heat pump system 

    Bag, Ramakrishna; Sedighi, Majid; Manju; Rhys Thomas, Hywel (Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica, 2015-06-02)
    Text en actes de congrés
    Accés obert
    The ground heat exchangers (GHE) consist of pipes buried in the soil and are used for transferring heat between the soil and the heat exchanger pipes of the ground source heat pump (GSHP). This paper presents the development ...
  • A finite element approach to the simulation of hydraulic fractures with lag 

    Hunsweck, Michael J.; Shen, Yongxing; Lew, Adrian J. (2013)
    Article
    Accés obert
    We presented a finite-element-based algorithm to simulate plane-strain, straight hydraulic fractures in an impermeable elastic medium. The algorithm acCOllllts for the nonlinear coupling between the fluid pressure and the ...
  • A Finite Element Model for Free Surface and Two Fluid Flows on Fixed Meshes 

    Coppola Owen, Herbert (Universitat Politècnica de Catalunya, 2009-06-19)
    Tesi
    Accés obert
    Los flujos con interfaces móviles (problemas de superficie libres y de dos fluidos) aparecen en numerosas aplicaciones de ingeniería. Los métodos presentados en esta tesis están orientados principalmente a la simulación ...
  • A finite Element model for incompressible flow problems 

    Codina, Ramon (Universitat Politècnica de Catalunya, 1992-06-30)
    Tesi
    Accés obert
  • A finite element strategy coupling a gradient-enhanced damage model and cohesive cracks for quasi-brittle materials 

    Tamayo Mas, Elena; Rodríguez Ferran, Antonio (2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A new combined strategy to describe failure of quasi-brittle materials is presented thus allowing the complete description of the process, from initiation of damage to crack propagation. For the early stages of the process, ...
  • A finite point method for adaptive-three-dimensional compressible flow calculations 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo (2009-07-30)
    Article
    Accés obert
    The finite point method (FPM) is a meshless technique, which is based on both, a weighted least-squares numerical approximation on local clouds of points and a collocation technique which allows obtaining the discrete ...
  • A finite thickness band method for ductile fracture analysis 

    Huespe, Alfredo Edmundo; Needleman, Alan; Oliver Olivella, Xavier; Sánchez, Pedro José (2009)
    Article
    Accés obert
    We present a finite element method with a finite thickness embedded weak discontinuity to analyze ductile fracture problems. The formulation is restricted to small geometry changes. The material response is characterized ...
  • A finite-volume/level-set interface capturing method for unstructured grids: Simulations of bubbles rising through viscous liquids 

    Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Castro González, Jesús; Oliva Llena, Asensio (WIT Press, 2014)
    Text en actes de congrés
    Accés obert
    A numerical method is developed for simulating two-phase flows with moving inter-phase boundaries, which is integrated in a finite-volume framework on collocated unstructured grids of arbitrary element type. The location, ...
  • A finite-volume/level-set method for simulating two-phase flows on unstructured grids 

    Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Rigola Serrano, Joaquim (2014-09)
    Article
    Accés restringit per política de l'editorial
    The conservative level-set method for capturing the interface between two fluids is combined with a variable density projection scheme to simulate incompressible two-phase flows on unstructured meshes. All equations are ...
  • A First approach of using ultrasound as an alternative for blanching in vacuum-packaged potato strips 

    Alvares Amaral, Rivia; Benedetti, Benedito Carlo; Pujolà Cunill, Montserrat; Achaerandio Puente, María Isabel; Bachelli, Mara Lígia (2016-10-01)
    Article
    Accés restringit per política de l'editorial
    The effect of ultrasound (US) (40 kHz, 200 W, 3 min), blanching (85 °C, 3.5 min), and the combination of both methods was evaluated on the quality of vacuum-packaged potato strips stored at 3 ± 1 °C for up to 10 days. For ...
  • A first approach to the multipurpose relational database server 

    Blanco, Ignacio J.; Martínez-Cruz, Carmen; Serrano Chica, José María; Vila Miranda, María Amparo (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2005)
    Article
    Accés obert
    In this paper, an architecture and an implementation of a multipurpose relational database server are proposed. This architecture enables classical queries to be executed, deductions to be made, and data mining operations to ...
  • A first approximation in order to define a Difficulty Factor of the bi-classification in a dataset by using SVMs 

    González Abril, Luis; Angulo Bahón, Cecilio (2013)
    Comunicació de congrés
    Accés obert
    The main aim in this paper is to analyze the complexity of a Support Vector Machine -SVM- in the construction of a classifier for a bi-classification problem on a specific dataset. Hence, an index is defined in terms of ...
  • A first principle analysis of the structure of oligoanilines doped with alkylsulfonic acids 

    Casanovas, Jordi; Canales Gabriel, Manel; Ferreira, Carlos; Alemán Llansó, Carlos (2009)
    Article
    Accés restringit per política de l'editorial
    The interaction of polyaniline with alkylsulfonate dopants have been investigated at the atomic level using quantum mechanical methods. Calculations have been performed on complexes formed by dopant molecules with an alkyl ...