Now showing items 1-20 of 122

    • 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 ...
    • 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 ...
    • A mathematical perspective on how test-type exams are evaluated 

      Freixas Bosch, Josep; Pons Vallès, Montserrat (2020)
      Conference report
      Restricted access - confidentiality agreement
      Typically, the test type exams with binary answers (true / false) are corrected by adding a +1 to the correct answers, a -1 to the incorrect ones and 0 to non-answered questions. This mainly obeys to a purely statistic ...
    • 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 ...
    • 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 ...
    • 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 ...
    • An Approach to enhance efficiency of DEM modelling of soils with crushable grains 

      Ciantia, Matteo Oryem; 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 ...
    • 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 ...
    • Analytical and simplified numerical approaches of FRCM pipes 

      Bernat Masó, Ernest; Mercedes Cedeño, Luis Enrique; Gil Espert, Lluís (Elsevier, 2020-06-30)
      Article
      Restricted access - publisher's policy
      Despite the well-known advantages of fabric-reinforced cementitious matrix (FRCM), few applications of this composite material have been proposed apart from structural strengthening. To exploit material corrosion resistance, ...
    • Anàlisi de sensibilitat i calibratge d'un model cardiorespiratori. 

      Cortès Serra, Guillem (Universitat Politècnica de Catalunya, 2019-06-11)
      Master thesis
      Restricted access - confidentiality agreement
    • 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 ...
    • 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 ...
    • Apocalipsis zombi: Comparación con la propagación de una enfermedad infecciosa (II) 

      Flores Rosales, Edson (Universitat Politècnica de Catalunya, 2019-07-04)
      Bachelor thesis
      Open Access
      [CASTELLÀ] Este trabajo es la continuación del presentado por Adrià Molina en 2017 [26], donde toma como base algunos modelos matemáticos y sus ecuaciones diferenciales que describen la propagación de enfermedades infecciosas ...
    • Applying metamodels and sequential sampling for constrained optimization of process operations 

      Shokry Abdel-aleem, Ahmed; 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 ...
    • Cambio climático y curvas IDF: informe 

      Casas Castillo, M. del Carmen; Rodríguez Solá, Raúl (2017-02-07)
      External research report
      Restricted access - confidentiality agreement