Now showing items 1-20 of 64

  • Active damping based on Ackermann's formula for a three-phase voltage source inverter with LCL filter 

    Guzmán Solà, Ramon; García de Vicuña Muñoz de la Nava, José Luis; Morales López, Javier; Momeneh, Arash; Miret Tomàs, Jaume; Torres Martínez, Javier (2015)
    Conference report
    Restricted access - publisher's policy
    This paper presents an active damping method in natural frame for a three-phase voltage source inverter with LCL filter. The proposed method is based on the pole placement technique via Ackermann's formula. This approach ...
  • A generalization of the Caginalp phase-field system based on the Cattaneo law 

    Miranville, Alain; Quintanilla de Latorre, Ramón (Elsevier, 2009)
    Article
    Restricted access - publisher's policy
    We consider in this article a generalization of the Caginalp model for phase transitions based on the Maxwell Cattaneo law, instead of the classical Fourier law. In particular, we prove the existence and uniqueness of ...
  • A model in price formation 

    Anwasia, Benjamin (Universitat Politècnica de Catalunya, 2014-07)
    Master thesis
    Open Access
    In this thesis a particular example of a price formation model was studied. The model consist of a (large) group of buyers and a (large) group of vendors trading a particular good at a certain price. The model is given by ...
  • Amorphous carbon modified nano-sized tungsten carbide as a gas diffusion electrode catalyst for the oxygen reduction reaction 

    Liu, Zhiwei; Li, Ping; Zhai, Fuqiang; Wan, Qi; Volinsky, Alex A.; Qu, Xuanhui (2015-01-01)
    Article
    Open Access
    Nanostructured tungsten carbide with high surface area and containing amorphous carbon is prepared by a low temperature combustion synthesis method. The nanostructured tungsten carbide is used as the catalyst in a gas ...
  • Análisis de estabilidad Arnoldi de las ondas de Tollmien-Schlichting en fluidos viscosos 

    Montañez Fabrés, Raquel (Universitat Politècnica de Catalunya, 2017-07)
    Bachelor thesis
    Open Access
    En este trabajo se estudia la estabilidad de las ondas Tollmien-Schlichting, que aparecen como una primera fase de la inestabilidad del flujo de Poiseuille plano como paso de laminar a turbulento. Se calcula la curva de ...
  • Analysis and calibration of Ground Penetrating Radar shielded antennas 

    Rasol, M.; Pérez Gracia, María de la Vega; Santos Assunçao, Sonia (2018)
    Conference report
    Open Access
    Ground-Penetrating Radar (GPR) is a non-destructive geophysical method applied in many civil engineering applications. The knowledge of the GPR antennas behavior is crucial to obtain accurate results and comprehensive data ...
  • Analysis of bias stress on thin-film transistors obtained by Hot-Wire Chemical Vapour Deposition 

    Dosev, D K; Puigdollers i González, Joaquim; Orpella García, Alberto; Voz Sánchez, Cristóbal; Fonrodona, Marta; Soler Vilamitjana, David; Marsal, L F; Pallarès Marzal, Josep; Bertomeu Balaguero, Joan; Andreu Batallé, Jordi; Alcubilla González, Ramón (2001-02)
    Article
    Open Access
    The stability under gate bias stress of unpassivated thin film transistors was studied by measuring the transfer and output characteristics at different temperatures. The active layer of these devices consisted of in ...
  • Analysis of international one meter class hull shapes 

    Pons Forn, Ariadna (Universitat Politècnica de Catalunya, 2015-06)
    Bachelor thesis
    Restricted access - author's decision
  • Analysis on dynamic interaction of renewable SSG SPC with external power grid 

    Abdollahi, Mostafa; Candela García, José Ignacio; Rocabert Delgado, Joan; Muñoz Aguilar, Raúl Santiago; Rodríguez Cortés, Pedro (2017)
    Conference report
    Restricted access - publisher's policy
    Control of renewables by Synchronous Power Controller (SPC) technology provides virtual damping and inertia which results to support phase stability on the grid and keep synchronism of interconnected areas tighter. Serving ...
  • Analytical method for the assessment of unreinforced brick masonry walls subjected to eccentric compressive loads 

    Bernat Masó, Ernest; Gil Espert, Lluís; Roca Fabregat, Pedro (2014-12-30)
    Article
    Open Access
    Slender unreinforced masonry walls are likely to fail due to mechanism formation when they are subjected to eccentric compression loads causing second order bending effects. A practical analytical formulation is herein ...
  • An architecture providing depolarization ratio capability for a multi-wavelength Raman lidar: implementation and first measurements 

    Rodríguez Gómez, Alejandro Antonio; Sicard, Michaël; Granados Muñoz, María José; Ben Chahed, Enis; Muñoz Porcar, Constantino; Barragán Cuesta, Rubén; Comerón Tejero, Adolfo; Rocadenbosch Burillo, Francisco; Vidal, Eric (MDPI AG, 2017-12-20)
    Article
    Open Access
    A new architecture for the measurement of depolarization produced by atmospheric aerosols with a Raman lidar is presented. The system uses two different telescopes: one for depolarization measurements and another for ...
  • A near-optimum MAC protocol based on the distributed queueing random access protocol (DQRAP) for a CDMA mobile communication system 

    Alonso Zárate, Luis Gonzaga; Agustí Comes, Ramon; Sallent Roig, José Oriol (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-09)
    Article
    Open Access
    This paper presents and analyzes a new near-optimum medium access control (MAC) protocol. The proposed access scheme is suitable for a CDMA mobile communication environment, and keeps under control and upper bounded the ...
  • Application of hyperstability theory to interference cancelling 

    Bertran Albertí, Eduardo; Montoro López, Gabriel (O.YUKSEL IEEE, 1994)
    Conference report
    Open Access
    An alternative to the usual adaptive noise cancelling method devoted to removing interference is presented. In the conventional methodology to implement adaptive cancellers a reference signal is necessary correlated with ...
  • A stability theorem in nonlinear bilevel programming 

    Wang, Shouyang; Wang, Qian; Coladas Uria, Luis (Institut d'Estadística de Catalunya, 1996)
    Article
    Open Access
    In this short paper, we are concerned with the stability of nonlinear bilevel programs. A stability problem is proven and an example is given to illustrate this theorem.
  • Bounds for the Nakamura number 

    Freixas Bosch, Josep; Kurz, Sascha (Springer, 2019-04)
    Article
    Restricted access - publisher's policy
    The Nakamura number is an appropriate invariant of a simple game to study the existence of social equilibria and the possibility of cycles. For symmetric (quota) games its number can be obtained by an easy formula. For ...
  • Coalition formation and stability 

    Magaña Nieto, Antonio; Carreras Escobar, Francisco (2018-06)
    Article
    Open Access
    This paper aims to develop, for any cooperative game, a solution notion that enjoys stability and consists of a coalition structure and an associated payoff vector derived from the Shapley value. To this end, two concepts ...
  • Collective relaxation dynamics and crystallization kinetics of the amorphous Biclotymol antiseptic 

    Tripathi, Pragya; Romanini, Michela; Tamarit Mur, José Luis; Macovez, Roberto (2015-11-10)
    Article
    Open Access
    We employ dielectric spectroscopy to monitor the relaxation dynamics and crystallization kinetics of the Biclotymol antiseptic in its amorphous phase. The glass transition temperature of the material as determined by ...
  • Comparison of high-order continuous and hybridizable discontinuous {G}alerkin methods in incompressible fluid flow problems 

    Paipuri, Mahendra; Fernández Méndez, Sonia; Tiago, Carlos (2018-10-01)
    Article
    Open Access
    The computational efficiency and the stability of Continuous Galerkin (CG) methods, with Taylor–Hood approximations, and Hybridizable Discontinuous Galerkin (HDG) methods are compared for the solution of the incompressible ...
  • Computational limit analysis for anchors and retaining walls 

    Muñoz Romero, José; Lyamin, Andrei V.; Huerta, Antonio (Universitat Politècnica de Catalunya. Escola Tècnica Superior de Camins Canals i Ports de Barcelona, 2011-11-15)
    Conference lecture
    Open Access
    The computation of the bearing capacity of engineering structures commonly relays on results obtained for simple academic examples. Recent developments in computational limit analysis have allowed engineers to compute ...
  • Enhanced stability in semi-transparent PTB7/PC71BM photovoltaic cells 

    Romero Gómez, Pablo; Betancur Lopera, Rafael; Martinez Otero, Alberto; Elias Pera, Xavier; Mariano, Marina; Romero, Beatriz; Arredondo, Belen; Vergaz, Ricardo; Martorell Pena, Jordi (2015-06-01)
    Article
    Open Access
    We studied the performance over time of opaque and semi-transparent PTB7:PC71BM bulk heterojunction solar cells. For unsealed inverted configuration cells we observe that when the isolation from the environment is improved, ...