Now showing items 13-24 of 66

  • Optimal control of a water distribution network in a supervisory control system 

    Cembrano Gennari, Gabriela; Wells, G; Quevedo Casín, Joseba Jokin; Pérez Magrané, Ramon; Argelaguet Isanta, María Rosa (2000-05)
    Article
    Open Access
    This paper deals with the use of optimal control techniques in water distribution networks. An optimal control tool, developed in the context of a European research project is described and the application to the city of ...
  • Fault detection and isolation in critical infrastructure systems 

    Puig Cayuela, Vicenç; Escobet Canal, Teresa; Sarrate Estruch, Ramon; Quevedo Casín, Joseba Jokin (2014)
    Conference report
    Open Access
    Critical infrastructure systems (CIS) are complex large-scale systems which in turn require highly sophisticated supervisory control systems to ensure that high performance can be achieved and maintained under adverse ...
  • Decomposition of geometric constraint graphs based on computing fundamental circuits. Correctness and complexity 

    Joan Arinyo, Robert; Tarres Puertas, Marta Isabel; Vila Marta, Sebastià (2014-07-01)
    Article
    Restricted access - publisher's policy
    In geometric constraint solving, Decomposition Recombination solvers (DR-solvers) refer to a general solving approach where the problem is divided into a set of sub-problems, each sub-problem is recursively divided until ...
  • Forward backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders 

    Águila López, Francisco del; Ametller Congost, Lluís; Talavera Sánchez, Pedro (2002-10)
    Article
    Open Access
    We discuss forward-backward charge asymmetries for lepton-pair production in association with a large-transverse-momentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AjFB gives a new ...
  • A low in-band radiation superregenerative oscillator 

    Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa (2013-05-27)
    Article
    Open Access
    This brief describes a superregenerative (SR) voltage-controlled oscillator as a building block for SR receivers where most of the oscillator spectrum components are outside the reception frequency band. This allows ...
  • Fault diagnosis of advanced wind turbine benchmark using interval-based ARRs and observers 

    Sánchez Sardi, Héctor Eloy; Escobet Canal, Teresa; Puig Cayuela, Vicenç (2014)
    Conference report
    Restricted access - publisher's policy
    In this paper, the problem of the fault diagnosis of an advanced wind turbine benchmark will be addressed using analytical redundant relations (ARRs) and observers that considers uncertainty in a bounded context, using the ...
  • Phase contrast and operation regimes in multifrequency atomic force microscopy 

    Santos Hernández, Sergio (2014-04-07)
    Article
    Open Access
    In amplitude modulation atomic force microscopy the attractive and the repulsive force regimes induce phase shifts above and below 90°, respectively. In the more recent multifrequency approach, however, multiple operation ...
  • A set simulation approach to the computation of invariant sets for nonlinear systems 

    Cugueró Escofet, Josep; Saludes Closa, Jordi; Escobet Canal, Teresa (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference lecture
    Restricted access - publisher's policy
    Given a nonlinear discrete-time system, previous works exist that compute invariant sets as finite unions of boxes. Set inversion algorithms based on interval arithmetic are used to obtain inner approximations of the one ...
  • Unlocking higher harmonics in atomic force microscopy with gentle interactions 

    Santos Hernández, Sergio; Barcons Xixons, Víctor; Font Teixidó, Josep; Verdaguer Prats, Albert (2014-03-11)
    Article
    Open Access
    In dynamic atomic force microscopy, nanoscale properties are encoded in the higher harmonics. Nevertheless, when gentle interactions and minimal invasiveness are required, these harmonics are typically undetectable. Here, ...
  • A superregenerative QPSK receiver 

    Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa (2014-01)
    Article
    Open Access
    In this paper we present a description and experimental verification of a superregenerative receiver (SR) for QPSK signals. Exploiting the fact that a conventional SR generates pulses which preserve the input phase ...
  • Enhanced sensitivity and contrast with bimodal atomic force microscopy with small and ultra-small amplitudes in ambient conditions 

    Santos Hernández, Sergio (2013-12-02)
    Article
    Open Access
    Here, we introduce bimodal atomic force microscopy operated with sub-nm and ultra-small, i.e., sub-angstrom, first and second mode amplitudes in ambient conditions. We show how the tip can be made to oscillate in the ...
  • Analog circuit test based on a digital signature 

    Gómez Pau, Álvaro; Sanahuja Moliner, Ricard; Balado Suárez, Luz María; Figueras Pàmies, Joan (2010)
    Conference report
    Open Access
    Production verification of analog circuit specifica- tions is a challenging task requiring expensive test equipment and time consuming procedures. This paper presents a method for low cost on-chip parameter verification ...