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Ara es mostren els items 4811-4830 de 245842

    • A mathematical formulation of the loop pipelining problem 

      Cortadella, Jordi; Badia Sala, Rosa Maria; Sánchez Carracedo, Fermín (Universitat Politècnica de Catalunya (UPC), 1996)
      Text en actes de congrés
      Accés obert
      This paper presents a mathematical model for the loop pipelining problem that considers several parameters for optimization and supports any combination of resource and timing constraints. The unrolling degree of the loop ...

    • A mathematical framework for structural control integration 

      Rossell Garriga, Josep Maria; Rodellar Benedé, José; Palacios Quiñonero, Francisco; Rubió Massegú, Josep (Trans Tech Publications, 2012)
      Text en actes de congrés
      Accés obert
      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 coupling tumor growth and angiogenesis 

      Xu, Jiangping; Vilanova Caicoya, Guillermo; Gómez Díaz, Héctor (Public Library of Science (PLOS), 2016-02-18)
      Article
      Accés obert
      We present a mathematical model for vascular tumor growth. We use phase fields to model cellular growth and reaction-diffusion equations for the dynamics of angiogenic factors and nutrients. The model naturally predicts ...

    • A mathematical model for ammonium removal and recovery from real municipal wastewater using a natural zeolite 

      Sheikh, Mahdi; Vallés Nebot, Víctor; Valderrama Ángel, César Alberto; Cortina Pallás, José Luís; Rezakazemi, Mashallah (Elsevier, 2023-10-01)
      Article
      Accés restringit per política de l'editorial
      A study was carried out to remove/recover ammonium (NH4+) from residual effluents in tertiary treatment by sorption/desorption processes onto a natural clinoptilolite zeolite (NZ) in batch and fixed-bed column systems. ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 for the COVID-19 pandemic in Tokyo through changing point calculus 

      Martínez Vázquez, Laura; Fonseca Casas, Pau (Multidisciplinary Digital Publishing Institute, 2023-11-12)
      Article
      Accés obert
      The great social and economic impact that the COVID-19 pandemic has had on a global level has encouraged the development of new mathematical models that make it possible to better manage this and future pandemics. Here, ...

    • A mathematical model for the energy stored in green roofs 

      Aguareles Carrero, María; Calvo Schwarzwälder, Marc; Font Martínez, Francesc; Myers, Timothy G. (2023-03-13)
      Article
      Accés obert
      A simple mathematical model to estimate the energy stored in a green roof is developed. Analytical solutions are derived corresponding to extensive (shallow) and intensive (deep) substrates. Results are presented for the ...

    • A mathematical model for the motion of an in-flight soccer ball 

      Myers, Timothy; Mitchell, Sarah Louise (2013)
      Article
      Accés obert
      In this paper, an analytical and numerical study of the three-dimensional equations describing the motion through the air of a spinning ball is presented. The initial analysis involves constant drag coefficients, but is ...

    • A mathematical model for the scheduling of virtual microgrids topology into an active sistribution network 

      García Muñoz, Fernando Esteban; Díaz González, Francisco; Corchero García, Cristina (Multidisciplinary Digital Publishing Institute, 2020-10-15)
      Article
      Accés obert
      This article presents a method based on a mathematical optimization model for the scheduling operation of a distribution network (DN). The contribution of the proposed method is that it permits the configuration and operation ...

    • A mathematical model of carbon capture by adsorption 

      Font Martínez, Francesc; Myers, Timothy; Hennessy, Matthew G. (2021-08-02)
      Capítol de llibre
      Accés restringit per política de l'editorial
      We present a model to describe the capture of carbon by an adsorbing porous material occupying a circular cross-section column. The model consists of an advection-reaction-diffusion equation for the gas concentration coupled ...

    • 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
      Accés restringit per política de l'editorial
      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)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      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 mathematical model of tumour angiogenesis: growth, regression and regrowth 

      Vilanova Caicoya, Guillermo; Colominas Ezponda, Ignasi; Gómez, Héctor (2017-01)
      Article
      Accés obert
      Cancerous tumours have the ability to recruit new blood vessels through a process called angiogenesis. By stimulating vascular growth, tumours get connected to the circulatory system, receive nutrients and open a way to ...

    • A mathematical model to study railway track dynamics for the prediction of vibration levels generated by rail vehicles 

      Otero Yugat, Jesús; Martínez Miralles, Jordi Ramon; Santos López, M. Antonia de los; Cardona Foix, Salvador (2012-01)
      Article
      Accés obert
      This article presents a mathematical model aimed at predicting wheel–rail contact vibration force arising from wheel profile irregularities. Prediction of vibrations caused by a passing train is a basic factor in environmental ...

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

      Freixas Bosch, Josep; Pons Vallès, Montserrat (2020)
      Text en actes de congrés
      Accés restringit per acord de confidencialitat
      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 mathematical programming approach for different scenarios of bilateral bartering 

      Nasini, Stefano; Castro Pérez, Jordi; Fonseca Casas, Pau (Institut d'Estadística de Catalunya, 2015-01-01)
      Article
      Accés obert
      The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This paper provides a novel mathematical ...

    • A mathematical programming approach for different scenarios of bilateral bartering 

      Nasini, Stefano; Castro Pérez, Jordi; Fonseca, Pau (Institut d'Estadística de Catalunya, 2015-06)
      Article
      Accés obert
      The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This paper provides a novel mathematical ...

    • A mathematical proof of the soundness of the Fibonacci retracement rule in technical analysis of asset prices 

      Pujadas Ramalhinho, Vera (Universitat Politècnica de Catalunya, 2021-01)
      Treball Final de Grau
      Accés obert
      This project covers the idea of the Fibonacci retracement rule and its mathematical proof. Firstly, a thorough analysis of stochastic processes, in particular, diffusion processes such as the Brownian motion, the CEV model ...

    • A mathematics peer assessment process for flexible modes of delivery 

      Pick, Louise; Manda, Krishnagoud; Cole, Jonathan; McCartan, Charles; Hermon, Paul (Universitat Politècnica de Catalunya, 2022-09)
      Text en actes de congrés
      Accés obert
      Educators have experienced significant challenges managing assessment processes over the last two years, particularly when converting in-person interactive and groupbased activities to an online format. This was of immediate ...

    • A matrix derivation of a representation theorem for (trAp)1/p 

      Neudecker, Heinz (Universitat Politècnica de Catalunya. Centre de Càlcul, 1989)
      Article
      Accés obert
      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 ...