Now showing items 1-20 of 27

    • A Taylor error propagation approach for Structural System Identification by Observability Method 

      Bataillou Almagro, Marc Christian (Universitat Politècnica de Catalunya, 2019-07-08)
      Master thesis
      Restricted access - author's decision
      Sistemas estocásticos de ecuaciones aplicado a la identificación de sistemas estructurales
    • An explicit method for modeling lossy and dispersive transmission lines 

      Palà Schönwälder, Pere; Miró Sans, Joan Maria (Microwave Exhibitions and Publishers, 1993)
      Conference report
      Open Access
      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, ...
    • An extension of Vickrey Commute Model by means of the Macroscopic Fundamental Diagram (MFD) 

      Ruiz Palomo, Daniel (Universitat Politècnica de Catalunya, 2019-02-20)
      Master thesis
      Open Access
      El model de Vickrey s'ha utilitzat per gestionar el trànsit en una infrastructura que presenti un coll d'ampolla (problema unidimensional). La idea del TFM és ampliar el model de Vickrey a una àrea urbana (barri, prob. ...
    • An interval NLPV parity equations approach for fault detection and isolation of a wind farm 

      Blesa Izquierdo, Joaquim; Jiménez, Pedro; Rotondo, Damiano; Nejjari Akhi-Elarab, Fatiha; Puig Cayuela, Vicenç (Institute of Electrical and Electronics Engineers (IEEE), 2014-12-25)
      Article
      Open Access
      In this paper, the problem of fault diagnosis of a wind farm is addressed using interval nonlinear parameter varying (NLPV) parity equations. Fault detection is based on the use of parity equations assuming unknown but ...
    • Arbitrary wave synthesis using spectral transformations 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1993)
      Conference report
      Open Access
      The different transformations among plane, cylindrical and spherical spectrum allow to tackle the arbitrary field synthesis from a set of known sources. Putting all the spectrums in the same coordinate axis we can obtain ...
    • Cepstrum constraints in ME spectral estimation 

      Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1983)
      Conference report
      Open Access
      Current trends in spectral estimation techniques follow basicaly two guidelines; by introducing modifications in the objctive function to be minimized or, keeping the objetive, by modifying the set of constraints in the ...
    • Development of self-calibration techniques for on-wafer and fixtured measurements: a novel approach 

      Pradell i Cara, Lluís; Purroy Martín, Francesc; Cáceres, M. (. MICROWAVE EXHIBITIONS AND PUBLISHERS, 1992)
      Conference report
      Open Access
      Network Analyzer self-calibration techniques - TRL, LMR, TAR- are developed, implemented and compared in several transmission media. A novel LMR (Line-Match-Reflect) technique based on known LINE and REFLECT Standards, is ...
    • Evaluation of A+B=K conditions without carry propagation 

      Cortadella, Jordi; Llaberia Griñó, José M. (Institute of Electrical and Electronics Engineers (IEEE), 1992-11)
      Article
      Open Access
      The response time of parallel adders is mainly determined by the carry propagation delay. The evaluation of conditions of the type A+B=K is addressed. Although an addition is involved in the comparison, it is shown that ...
    • Frozen Jacobian iterative method for solving systems of nonlinear equations: application to nonlinear IVPs and BVPs 

      Ullah, Malik Zaka; Ahmad, Fayyaz; Alshomrani, Ali Saleh; Alzahrani, A. K.; Alghamdi, Metib Said; Ahmad, Shamshad; Ahmad, Shahid (2016-12-01)
      Article
      Restricted access - publisher's policy
      Frozen Jacobian iterative methods are of practical interest to solve the system of nonlinear equations. A frozen Jacobian multi-step iterative method is presented. We divide the multi-step iterative method into two parts ...
    • Gestió de la mobilitat en àrees urbanes mitjançant tarifació i ramp metering 

      Ruiz Palomo, Daniel (Universitat Politècnica de Catalunya, 2019-01-25)
      Master thesis
      Open Access
      El model de Vickrey s'ha utilitzat per gestionar el trànsit en una infrastructura que presenti un coll d'ampolla (problema unidimensional). La idea del TFM és ampliar el model de Vickrey a una àrea urbana (barri, prob. ...
    • Leak simulation system for testing of early refrigerant detection devices 

      Capel Ostáriz, Javier (Universitat Politècnica de Catalunya, 2019-07-08)
      Bachelor thesis
      Open Access
      Covenantee:   AKO
      This project has consisted in the design, engineering and construction of an automatic test and demonstration machine which attempts to simulate real gas leaks. More concretely it is based in the developing of a precise ...
    • Matrices generadas por adición de díadas (matrices de rango 1): propiedades y aplicaciones 

      Ortigueira, Manuel D. (Centro Internacional de Métodos Numéricos en Ingeniería, 1996)
      Article
      Open Access
      Se estudian las matrices elementales de rango 1 (díadas). Para estas matrices se presentan fórmulas para su factorización, inversión, descomposición en valores propios y valores singulares. Estos resultados son aplicados ...
    • Multi-step derivative-free preconditioned Newton method for solving systems of nonlinear equations 

      Ahmad, Fayyaz (2017-02-16)
      Article
      Open Access
      Preconditioning of systems of nonlinear equations modifies the associated Jacobian and provides rapid convergence. The preconditioners are introduced in a way that they do not affect the convergence order of parent iterative ...
    • Natural convection in a horizontal cylinder with axial rotation 

      Sánchez Casals, Odalys de la Caridad; Mercader Calvo, María Isabel; Batiste Boleda, Oriol; Alonso Maleta, María Aránzazu (AMER PHYSICAL SOC, 2016-06-23)
      Article
      Open Access
      We study the problem of thermal convection in a laterally heated horizontal cylinder rotating about its axis. A cylinder of aspect ratio Gamma = H/2R = 2 containing a small Prandtl number fluid (sigma = 0.01) representative ...
    • Navier-Stokes/Forchheimer models for filtration through porous media 

      Cimolin, Flavio; Discacciati, Marco (2013-10)
      Article
      Open Access
      Modeling the filtration of incompressible fluids through porous media requires dealing with different types of partial differential equations in the fluid and porous subregions of the computational domain. Such equations ...
    • Non-linear deformations of porous elastic solids 

      Iesan, Dorin; Quintanilla de Latorre, Ramón (2013-03-01)
      Article
      Restricted access - publisher's policy
      This paper is concerned with the non-linear theory of porouselastic bodies. First, we present the basic equations in general curvilinear coordinates. The constitutive equations for porouselastic bodies with incompressible ...
    • On translating partial to total specifications with applications to theorem proving for partial specifications 

      Navarro Gómez, Marisa; Nivela Alós, M. Pilar Brígida; Orejas Valdés, Fernando (1989-09-12)
      External research report
      Open Access
      In this paper it is shown how partial specifications (with strong equations) can be translated into total ones. This translation is proven to be sound and complete, in the sense that a theorem is valid for all models of ...
    • Optimum self-reference spatial diversity processing for FDSS and FH communication systems 

      Pérez Palomar, Daniel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2000)
      Conference report
      Open Access
      In 1996, a new spread spectrum communication system, called Frequency Diversity Spread Spectrum (FDSS), was proposed as a system to mitigate the problems of the common spread spectrum techniques. In this paper, two blind ...
    • Partitioning: an essential step in mapping algorithms into systolic array processors 

      Navarro Guerrero, Juan José; Llaberia Griñó, José M.; Valero Cortés, Mateo (1987-07)
      Article
      Open Access
      The efficient solution of a large problem on a small systolic array requires good partitioning techniques to split the problem into subproblems that fit the array size.
    • Pattern selection near the onset of convection in binary mixtures in cylindrical cells 

      Alonso Maleta, Arantxa; Mercader Calvo, María Isabel; Batiste Boleda, Oriol (2014-08-01)
      Article
      Open Access
      We report numerical investigations of three-dimensional pattern formation of binary mixtures in a vertical cylindrical container heated from below. Negative separation ratio mixtures, for which the onset of convection ...