Ara es mostren els items 1919-1938 de 93020

  • 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 ...
  • A first study on an oscillatory flow enclosed in a finite cylinder 

    Panadès i Guinart, Carles (Universitat Politècnica de Catalunya, 2009-09-14)
    Projecte Final de Màster Oficial
    Accés obert
    In this preliminar work, an oscillatory flow contained in a closed cylinder is investigated by means of spectral methods. The problem is quite related with the Stokes boundary layer and the major phenomena belong to this ...
  • A fittingness factor-based spectrum management framework for cognitive radio networks 

    Bouali, Faouzi; Sallent Roig, José Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2013-03)
    Article
    Accés restringit per política de l'editorial
    In order to increase cognitive radios (CRs) operation efficiency, there has been an increasing interest in strengthening awareness level about spectrum utilisation. In this respect, this paper proposes to exploit the ...
  • A fix-and-relax heuristic for controlled tabular adjustment 

    Baena, Daniel; Castro Pérez, Jordi (2013-07)
    Report de recerca
    Accés obert
    Controlled tabular adjustment (CTA) is an emerging protect ion technique for tabular data pro- tection. CTA formulates a mixed integer linear programming problem, which is tough for tables of moderate size. Finding a ...
  • A Fixed-Frequency Quasi-Sliding Control Algorithm: Application to Power Inverters Design by Means of FPGA Implementation 

    Ramos Lara, Rafael Ramón; Biel Solé, Domingo; Fossas Colet, Enric; Guinjoan Gispert, Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2003-01-31)
    Article
    Accés obert
    In this paper a fixed-frequency quasi-sliding control algorithm based on switching surface zero averaged dynamics (ZAD) is reported. This algorithm is applied to the design of a Buck-based inverter, and implemented in a ...
  • A flatness-based generalized optimization approach to spectral estimation 

    Nadeu Camprubí, Climent; Bertran Salvans, Miguel (1990-04)
    Article
    Accés obert
    In the optimization formulation, once the known autocorrelations are fixed as constraints, the objective functional completely characterizes the corresponding method of spectral estimation. After observing that this ...
  • A flexible dialogue system for enhancing web usability 

    Gatius Vila, Marta; González Bermúdez, Meritxell (WWW2009, 2009)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    In this paper, we study how the performance and usability of web dialogue systems could be enhanced by using an appropriate representation of the different types of knowledge involved in communication: general dialogue ...
  • A flexible framework for regional sustainable development indicators using system thinking criteria (INSURE) 

    Álvarez Arenas, Manuel; Mirón, I. (2007-03-29T12:47:58Z)
    Article
    Accés obert
    Developing politics and actions guided by sustainability criteria require to have elements that support decisions at the most strategic levels and facilitate the communication and justification of decisions made. To do so, ...
  • A flexible fuzzy inductive reasoning approach for load modelling able to cope with missing data 

    Jurado Gómez, Sergio; Nebot Castells, M. Àngela; Múgica Álvarez, Francisco (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering (ICST), 2015)
    Text en actes de congrés
    Accés obert
    Load forecasting in buildings and homes has been in recent years a task of increasing importance. New services and functionalities can be offered in the home environment due to this predictions, for instance, the detection ...
  • A Flexible IP Active Network Architecture 

    Galis, Alex; Serrat Fernández, Juan (Springer, 2000)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper presents the main concepts of the IST Project FAIN “Future Active IP Networks” [10], a three-year collaborative research project, whose main task is to develop and validate an open, flexible, programmable and ...
  • A Flexible Multitask Summarizer for Documents from Different Media, Domain and Language 

    Fuentes Fort, Maria (Universitat Politècnica de Catalunya, 2008-03-31)
    Tesi
    Accés obert
    Automatic Summarization is probably crucial with the increase of document generation. Particularly when retrieving, managing and processing information have become decisive tasks. However, one should not expect perfect ...
  • A flexible protocol communications approach for a supervisory system 

    Valle Alarcón, Rafael; Serrat Fernández, Juan (Institute for Communication Technology Management (CTM), 1989)
    Text en actes de congrés
    Accés obert
    This paper deals with the communication protocol intended to control up to 1016 devices of a new supervisory system. It has been conceived in two complementary phases. The first one (Cycle-A) is intended to inform the ...
  • A flow formulation for the optimum communication spanning tree 

    Fernández Aréizaga, Elena; Luna Mota, Carlos; Hildenbrandt, Achim; Reinelt, Gerard; Wiesberg, Stefan (Universidad de La Laguna, 2013)
    Text en actes de congrés
    Accés obert
    In this paper we address the Optimum Communication Spanning Tree Problem. We present a formulation that uses three index variables and we propose several families of inequalities, which can be used to reinforce the ...
  • A flux-free a posteriori error estimator for the incompressible Stokes problem using a mixed FE formulation 

    Larsson, Fredrik; Díez, Pedro; Huerta, Antonio (2010-08-01)
    Article
    Accés obert
    In this contribution, we present an a posteriori error estimator for the incompressible Stokes problem valid for a conventional mixed FE formulation. Due to the saddle-point property of the problem, conventional error ...
  • A focus on teaching and learning sustainability and social commitment skills 

    Alier Forment, Marc; Caetano, Nidia; García Peñalvo, Francisco José; Amante García, Beatriz; Martínez Martínez, María del Rosario (OmniaScience, 2015-12)
    Article
    Accés obert
    This JOTSE Special Issue is dedicated to the topic of teaching and learning the Sustainability and Social Compromise Skills, with a special focus in the context of engineering education. This topic was discussed in the ...