Now showing items 1693-1712 of 72473

  • A mathematical framework for structural control integration 

    Rossell Garriga, Josep Maria; Rodellar Benedé, José; Palacios Quiñonero, Francisco; Rubió Massegú, Josep (Trans Tech Publications, 2012)
    Conference report
    Open Access
    In this paper, some control strategies to design decentralized controllers are developed and discussed. These strategies are based on the Inclusion Principle, a very useful mathematical framework to obtain decentralized ...
  • A mathematical model for dynamic memory networks 

    Fàbrega Canudas, José; Fiol Mora, Miquel Àngel; Serra Albó, Oriol; Andrés Yebra, José Luis (Iniciativa Digital Politècnica, 2011)
    Conference report
    Open Access
    The aim of this paper is to bring together the work done several years ago by M.A. Fiol and the other authors to formulate a quite general mathematical model for a kind of permutation networks known as dynamic memories. A ...
  • A mathematical model of refinery operations characterised by complete horizontal integration of subsystems from purchase to product distribution 

    Alabi, Adebayo Adejare; Castro Pérez, Jordi (2009)
    Article
    Restricted access - publisher's policy
    Refinery economics are extremely complex and involve massive amounts of operational data and decision-making processes; therefore, most refinery planners model and solve each sub-problem sequentially and independently. ...
  • A Mathematical model of the spread of two viral sub-types on a Plant Leaf (Numerical Simulation) 

    Ramchand Lalwani, Nitin (Universitat Politècnica de Catalunya, 2015-06)
    Master thesis
    Restricted access - author's decision
    Whilst in humans free virus particles and host cells are assumed to be homogenously mixed, in plants, the spatial component is a key factor. The natural proliferation of the virus through a plant is known to happen from a ...
  • A matrix derivation of a representation theorem for (trAp)1/p 

    Neudecker, Heinz (Universitat Politècnica de Catalunya. Centre de Càlcul, 1989)
    Article
    Open Access
    A matrix derivation of a well-known representation theorem for (tr Ap)1/p is given, which is the solution of a restricted maximization problem. The paper further gives a solution of the corresponding restricted minimization ...
  • A matrix function useful in the estimation of linear continuous-time models. 

    Neudecker, Heinz (Institut d'Estadística de Catalunya, 2006)
    Article
    Open Access
    In a recent publication Chen & Zadrozny (2001) derive some equations for efficiently computing eA and ∇ eA, its derivative. They employ an expression due to Bellman (1960), Snider (1964) and Wilcox (1967) for the differential ...
  • A Max coverage formulation for information dissemination in vehicular networks 

    Trullols Cruces, Óscar; Barceló Ordinas, José María; Fiore, Marco; Casetti, Claudio; Chiasserini, Carla-Fabiana (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
    Conference lecture
    Open Access
    We consider that a given number of Dissemination Points (DPs) have to be deployed for disseminating information to vehicles travelling in an urban area. We formulate our problem as a Maximum Coverage Problem (MCP) so as ...
  • A maximum approach for robust MIMO design: combining OSTBC and beamforming with minimum transmission power requirements 

    Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2004)
    Conference report
    Open Access
    In this paper we address the problem of the design of a transmitter in a Multi-Input-Multi-Output (MIMO) space diversity system. We consider a design which is robust to errors in the channel estimate available at the ...
  • A mean field equation on a torus: one-dimensional symmetry of solutions 

    Cabré Vilagut, Xavier; Lucia D'Agostino, Marcello; Sanchón Rodellar, Manuel (2003)
    Article
    Open Access
    We study the equation $$-\Delta u=\lambda\left(\frac{e^u}{\int_\oep e^u}- \frac{1}{|\oep|}\right)\quad \text{in }\oep$$ for $u\in E$, where $E = \{ u \in H^1(\oep): u \hbox{ is doubly periodic}, \int_{\oep} u = 0 \}$ and ...
  • A measurement method to discriminate aircraft fly-over noise 

    Genesca Francitorra, Meritxell; Romeu Garbí, Jordi; Pàmies Gómez, Teresa (2010)
    Conference report
    Restricted access - publisher's policy
    Currently aircraft noise monitoring systems use a mesh of single microphones distributed around an airport to continuously sample the noise level. This fact requires a manual process of aircraft noise event detection and ...
  • A mechanism for sandbar straightening by oblique wave incidence 

    Garnier, Roland; Falqués Serra, Albert; Calvete Manrique, Daniel; Thiebot, Jerome; Ribas Prats, Francesca (2013-06-06)
    Article
    Open Access
    Breaker bars in the surf zone of sandy beaches generally evolve between straight bars parallel to the shore and meandering crescentic bars associated with intense (dangerous) currents flowing seaward through rip channels. ...
  • A mechanism for the generation of wave-driven rhythmic patterns in the surf zone 

    Falqués Serra, Albert; Coco, G; Huntley, D A (2000-10)
    Article
    Open Access
    The coupling between topographic irregularities and wave-driven mean water motion in the surf zone is examined. This coupling occurs because the topographic perturbations produce excess gradients in the wave radiation ...
  • A mechanism inhibiting rip channel formation for oblique waves 

    Garnier, Roland; Dodd, Nicholas; Falqués Serra, Albert; Calvete Manrique, Daniel (World Scientific Publishing Company, 2009)
    Conference lecture
    Restricted access - publisher's policy
    Previous numerical modelling studies based on 2DH morphodynamical model show that oblique waves tend to inhibit the formation of rip channel systems, but the mechanisms were not investigated. Field observations do not ...
  • A mechanism to electrically enlarge the ground plane of handset antennas: A bandwidth enhancement technique 

    Anguera, Jaume; Andújar Linares, Aurora; Puente Baliarda, Carles (2011-07)
    Article
    Restricted access - publisher's policy
    There is a need of developing new techniques for enhancing the bandwidth of handset antennas without increasing the antenna volume in order to incorporate more frequency bands into the cell phones. The technique to enhance ...
  • A medial-axis-based model for propagating cracks in a regularised bulk 

    Tamayo Mas, Elena; Rodríguez Ferran, Antonio (John Wiley & Sons, 2015-02-17)
    Article
    Open Access
    A new continuous-discontinuous strategy for the simulation of failure is presented. The continuous bulk is regularised by means of a gradient-enhanced damage model, where non-locality is introduced at the level of ...
  • A Mediterranean identity? The activity of the Mediterranean Cities Program 

    Llorach Herrero, Enric (2012)
    Conference report
    Open Access
  • A mediterranean nocturnal heavy rainfall and tornadic event. Part I: overview, damage survey and radar analysis 

    Van der Velde, Oscar Arnoud; Bech, Joan; Pineda Ruegg, Nicolau; Rigo, Tomeu; Aran, Montserrat; Amaró, Jésica; Gayà, M; Arús, J; Montañá Puig, Juan (2011-01-03)
    Article
    Restricted access - publisher's policy
    This study presents an analysis of a severe weather case that took place during the early morning of the 2nd of November 2008, when intense convective activity associated with a rapidly evolving low pressure system affected ...
  • A mediterranean nocturnal heavy rainfall and tornadic event. Part II: total lightning analysis 

    Pineda Ruegg, Nicolau; Bech, Joan; Rigo, Tomeu; Montañá Puig, Juan (2010-11-09)
    Article
    Restricted access - publisher's policy
    On the night from 1st to 2nd of November 2008, a multi-cell storm coming from the Mediterranean produced severe weather in the coastal area of Catalonia (NE Spain): groundlevel strong damaging wind gusts, a tornado – ...
  • A mesh-particle model for fluid animation 

    Susín Sánchez, Antonio; Suárez, N. (2006)
    Conference report
    Restricted access - publisher's policy
    We use our adapted versions of the two most used methods in Computer Fluid Animation, Marker and Cell and Smoothed Particle Hydrodynamics, to develop a new method taking advantage of the calculation speed of the first and ...
  • A meshless finite point method for the three-dimensional analysis of compressible flow problems involving moving boundaries and adaptivity 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (2013-10-10)
    Article
    Restricted access - publisher's policy
    A finite point method for solving compressible flow problems involving moving boundaries and adaptivity is presented. The numerical methodology is based on an upwind-biased discretization of the Euler equations, written ...