Now showing items 1-20 of 94

  • A comprehensive dynamic model for class-1 tensegrity systems based on quaternions 

    Cefalo, Massimo; Mirats Tur, Josep Maria (2011)
    Article
    Open Access
    In this paper we propose a new dynamic model, based on quaternions, for tensegrity systems of class-1. Quaternions are used to represent orientations of a rigid body in the 3-dimensional space eliminating the problem of ...
  • A conductance electrical model for representing and matching weighted undirected graphs 

    Igelmo Ganzo, Manuel; Sanfeliu Cortés, Alberto; Ferrer Sumsi, Miquel (2010)
    Conference report
    Open Access
    In this paper we propose a conductance electrical model to represent weighted undirected graphs that allows us to efficiently compute approximate graph isomorphism in large graphs. The model is built by transforming a graph ...
  • Advanced Spatial Temporal Regularization for Inverse Electrocardiography (ECG) 

    González Navarro, Paula (Universitat Politècnica de Catalunya, 2014-07-23)
    Bachelor thesis
    Open Access
    Covenantee:  Northeastern University
    [ANGLÈS] Heart diseases are the first cause of Mortality in the world. The percentage of the deceased who dies because of a cardiac infarction rises every year. Therefore, an early identification of typical signs may be ...
  • A general framework for softening regularisation based on gradient elasticity 

    Rodríguez Ferran, Antonio; Bennet, Terry; Askes, Harm; Tamayo Mas, Elena (2011-05-01)
    Article
    Open Access
    A general non-local approach to regularise strain-softening continua is presented. The key idea is to introduce the gradient-type enrichment at the level of displacements (rather than some internal variable), so the model ...
  • 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 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 ...
  • Análisis cinético y matemático de la tintura de tencel con colorantes directos 

    Lis Arias, Manuel José; Valldeperas Morell, José; Carrillo Navarrete, Fernando; Navarro Viciana, Juan Antonio (2006-07)
    Article
    Open Access
    En un intento de cuantificar el comportamiento tintóreo de la fibra Tencel con colorantes directos, se propone un enfoque por mecanismos que permite realizar un análisis del proceso desde dos puntos de vista: Cinético y ...
  • Analysis of masonry structures by funicular networks 

    Andreu Torras, Antoni; Gil Espert, Lluís; Roca Fabregat, Pedro (2010-09)
    Article
    Restricted access - publisher's policy
    A numerical approach for the ultimate analysis of large masonry structures composed of multiple linear members is presented. The approach is based on the use of computer-simulated cable nets representing the equilibrium ...
  • An Approach to enhance efficiency of DEM modelling of soils with crushable grains 

    Ciantia, Matteo; Arroyo Alvarez de Toledo, Marcos; Calvetti, Francesco; Gens Solé, Antonio (Thomas Telford, 2015-02)
    Article
    Open Access
    In this study oedometric compression tests of hydrocarbon coke, Fontainebleau sand and silica sand are simulated in three dimensions using breakable particles. The method adapts a rigorous breakage criterion for elasto-brittle ...
  • A novel approach for hybrid performance modelling and prediction of large-scale computing systems 

    Pllana, Sabri; Benkner, Siegfried; Xhafa Xhafa, Fatos; Barolli, Leonard (2009)
    Article
    Restricted access - publisher's policy
    We present a novel approach for hybrid performance modeling and prediction of large-scale parallel and distributed computing systems, which combines mathematical modeling and discrete-event simulation. We use mathematical ...
  • A novel model to predict a slap avalanche configuration using m:n-CAk cellular automata 

    Fonseca Casas, Pau; Colls, Màxim; Casanovas Garcia, Josep (Elsevier, 2010-08-23)
    Article
    Restricted access - publisher's policy
    The paper introduces a novel method to represent slap avalanche phenomena. The model is based on a cellular automaton generalization named m:n-$CA^k$. This generalization allows the use of different layers in a single ...
  • Apocalipsis zombi: comparación con la propagación de una enfermedad infecciosa 

    Molina Alcaide, Adrià (Universitat Politècnica de Catalunya, 2017-10)
    Bachelor thesis
    Restricted access - author's decision
    El estudio de enfermedades y la propagación de las mismas puede llegar a ser un factor clave para la supervivencia humana. Con el transcurso de los años, han sido propuestos numerosos modelos para tratar de simular la ...
  • Applying metamodels and sequential sampling for constrained optimization of process operations 

    Shokry, Ahmed F.; Espuña Camarasa, Antonio (2014)
    Conference report
    Restricted access - publisher's policy
    This paper presents a framework for nonlinear constrained optimization of complex systems, in which the objective function and the constraints are represented by black box functions. The proposed approach replaces the ...
  • Are SR Ca content fluctuations or SR refractoriness the key to atrial cardiac alternans?: insights from a human atrial model 

    Lugo Vélez, Carlos Antonio; Rodríguez Cantalapiedra, Inma; Peñaranda Ayllón, Angelina; Hove-Madsen, Leif; Echebarría Domínguez, Blas (2014-06-01)
    Article
    Restricted access - publisher's policy
    Despite the important role of electromechanical alternans in cardiac arrhythmogenesis, its molecular origin is not well understood. The appearance of calcium alternans has often been associated to fluctuations in the ...
  • A simple discrete simulation model to explore in the classroom some rules involved in the decision-making process: the cellular automata 

    Ginovart Gisbert, Marta (2013)
    Article
    Restricted access - publisher's policy
    The aim of this contribution is to pr esent teaching material elaborated to work with a very simple discrete model, the cellular automata called “Voting” (free access from the social science section of NetLogo ...
  • Cambio climático y curvas IDF: informe 

    Casas Castillo, M. del Carmen; Rodríguez Solá, Raúl (2017-02-07)
    External research report
    Restricted access - confidentiality agreement
  • Can systems immunology lead tuberculosis eradication? 

    Cardona Iglesias, Pere Joan; Català, Martí; Arch, Marta; Arias, Lilibeth; Alonso Muñoz, Sergio; Cardona, Paula; López Codina, Daniel; Vilaplana, Cristina; Prats Soler, Clara (Elsevier, 2018-10-30)
    Article
    Open Access
    25 years after the declaration of a Global Emergency by the World Health Organization, tuberculosis (TB) remains a major enemy to the humankind. During this period, much progress has been done to better understand its ...
  • Comments on "On the relationship between fractal dimension and the performance of multi-resonant dipole antennas using Koch curves" 

    González Arbesú, José María; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-06-30)
    Working paper
    Open Access
    Comentaris referits a l'article següent: K. J. Vinoy, J. K. Abraham, and V. K. Varadan, “On the relationship between fractal dimension and the performance of multi-resonant dipole antennas using Koch curves,” IEEE ...
  • Comparative models for minimizing ergonomic risk in assembly lines 

    Bautista Valhondo, Joaquín; Batalla García, Cristina; Alfaro Pozo, Rocío (Universidad de Navarra, 2016)
    Conference lecture
    Open Access
    We present a new mathematical model for the assembly line balancing problem with the objective of maximizing the line comfort to operators. Besides minimizing discrepancies between the ergonomic risks of workstations, ...
  • Comparison between mathematical models for roughness obtained in test machine and in industrial machine in semifinish honing processes 

    Buj Corral, Irene; Vivancos Calvet, Joan; Rodero de Lamo, Lourdes; Marco Almagro, Lluís (2015-12)
    Article
    Open Access
    In the present work second order mathematical models for semifinish honing are presented for average roughness Ra as a function of abrasive stone characteristics and honing parameters. Several tests were performed in both ...