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Dissertations / Theses on the topic 'I-517'

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Published: 25 July 2024

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1

Ziyatdinov, Andrey. "Biomimetic set up for chemosensor-based machine olfaction." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/285128.

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The thesis falls into the field of machine olfaction and accompanying experimental set up for chemical gas sensing. Perhaps more than any other sensory modality, chemical sensing faces with major technical and conceptual challenges: low specificity, slow response time, long term instability, power consumption, portability, coding capacity and robustness. There is an important trend of the last decade pushing artificial olfaction to mimic the biological olfaction system of insects and mammalians. The designers of machine olfaction devices take inspiration from the biological olfactory system
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2

Peco, Regales Christian. "Approximation of phase-field models with meshfree methods: exploring biomembrane dynamics." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/284209.

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Las biomembranas constituyen la estructura de separación fundamental en las celulas animales, y son importantes en el diseño de sistemas bioinspirados. Su simulación presenta desafíos, especialmente cuando ésta implica dinámica y grandes cambios de forma o se estudian sistemas micrométricos, impidiendo el uso de modelos atomísticos y de grano grueso. El objetivo principal de esta tesis es el desarrollo de un marco computacional para entender la dinámica de biomembranas inmersas en fluido viscoso usando modelos de campo de fase. Los modelos de campo de fase introducen un campo escalar contínuo
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3

Garcia, David (Garcia Carrera). "La excavación urbana y los edificios vecinos." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/312842.

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Currently, the intervention in urban excavations with greater dimension and depth is increasing in importance exponentially. The great sensitivity of the overlying buildings to the displacements and tensions produced in its foundations due to ground movements behind the retaining wall and the lack of resources and calculation criteria that the professionals who have to design these structural systems have to deal with, often produce unacceptable damage in the existing buildings. This document presents the extensive bibliography describing the research for nearly 70 years, that has been devel
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4

Bruna, Floris Lluís. "Estudi de l'estabilitat lineal de l'equació d'Einstein en els models de Robertson-Walker." Doctoral thesis, Universitat Autònoma de Barcelona, 2004. http://hdl.handle.net/10803/3085.

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5

Jiménez, Jiménez Ma José (María José). "Ecuaciones en diferencias lineales de segundo orden y su aplicación al análisis matricial." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/387126.

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It is well known the important role that difference equations play in several problems of the engineering or of the science. However, whereas the expression of the solutions when the coefficients of the equations are constant is widely known, the same does not happen for variable coefficients, except for the simplest case of first order equations. This work presents an analysis of the second order linear difference equations equations in the infinite, semi-infinite and finite cases. Moreover, for second order difference equations in the finite case, we study its associated boundary value prob
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6

Encinas, Bachiller Andrés Marcos. "Problemas de contorno discretos." Doctoral thesis, Universitat Politècnica de Catalunya, 2001. http://hdl.handle.net/10803/5904.

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En este trabajo se ha desarrollado un cálculo vectorial sobre estructuras discretas, análogo al de los modelos continuos. Para ello se ha considerado como espacio subyacente un multigrafo finito o variedad discreta y se ha definido el concepto de espacio tangente a cada vértice. A partir de esta noción se han definido los distintos tipos de campos sobre la variedad y se ha introducido la estructura de variedad Riemanniana discreta, lo que ha posibilitado construir los operadores gradiente, divergencia y Laplaciano. La consideración de métricas generales sobre los multigrafos tiene consecuenc
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7

López, Pablo Carlos. "Development of a new automated method for the quantification of nuclear immunohistochemical markers." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/8893.

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Antecedentes: La evaluación de marcadores inmunohistoquímicos se realiza con fines diagnósticos, terapéuticos e investigadores de forma manual. La utilización del análisis informatizado de imágenes digitales para evaluar estos marcadores aún no es suficientemente eficaz. <br/>Objetivos: Diseñar un nuevo procedimiento informatizado para cuantificar marcadores inmunohistoquímicos nucleares y evaluar los efectos de la compresión de imágenes. <br/>Métodos: El procedimiento desarrollado consta de diferentes etapas, donde se evalúan diferentes marcadores immunohistoquímicos utilizados en cáncer de
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8

Gutiérrez, i. Serrés Pere. "Estabilitat efectiva i tors invariants de sistemes hamiltonians quasi-integrables." Doctoral thesis, Universitat de Barcelona, 1995. http://hdl.handle.net/10803/2108.

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La memòria recull contribucions a diversos aspectes del problema de l'estabilitat en sistemes hamiltonians quasi-integrables. Aquests aspectes inclouen resultats d'estabilitat efectiva, que comporten el confinament de trajectòries durant un interval de temps molt gran, i també resultats que estableixen l'existència de tors invariants, entre els quals distingim els tors KAM i tors de dimensió inferior.<br/><br/>Considerem un sistema hamiltonià quasi-integrable, amb <i>n</i> graus de llibertat, en el qual la mida de la pertorbació és "Epsilon". Malgrat la possibilitat de difusió en aquest tipus
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9

Grau, Gotés Ma Àngela (Maria Àngela). "On iterative methods to solve nonlinear equations." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/396684.

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Many of the problems in experimental sciences and other disciplines can be expressed in the form of nonlinear equations. The solution of these equations is rarely obtained in closed form. With the development of computers, these problems can be addressed by numerical algorithms that approximate the solution. Specifically, fixed point iterative methods are used, which generate a convergent sequence presumably to the solution of the equation or system of equations. Since J.F. Traub (Iterative methods for the solution of equations, Prentice-Hall, N.J. 1964) initiated the qualitative as well the q
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Hernández, Ramírez Daría Micaela. "Análisis estadístico de corpus cronológicos : aplicación al estudio de bases bibliográficas y textos retóricos." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/404539.

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Due to the huge amount of textual data that is persintently generated, researchers are obliged to classify and analize them, even though there are different ways as well as computing tools to facilitate their study. In this thesis a procedure method as well as its computing tools are given in order to analyze chronological corpus. Our goal is focused mainly in analysing the corpus structure and clarifying the vocabulary flow. The proposed statistical methodology follows the one described by Bécue-Bertaut (2014) which allows the combination of classic multidimensional methods for data analysis
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11

Hierro, Fabregat Alba. "Monotonicity preserving shock capturing techniques for finite elements." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/398577.

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The main object of study of this thesis is the development of artificial diffusion shock capturing techniques for continuous and discontinuous Galerkin (cG and dG) approximations of the convection-diffusion problem. Special emphasis is given to the fulfillment of the Discrete Maximum Principle (DMP). Two artificial diffusion techniques are proposed for the transport problem in cG. They scale the corresponding artificial viscosity according to the variation of the gradient of the discrete solution between elements and one of them is proven to be monotonicity preserving. Both methods are used i
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Ramos, Garrido Lander. "Graph enumeration and random graphs." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/405943.

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In this thesis we use analytic combinatorics to deal with two related problems: graph enumeration and random graphs from constrained classes of graphs. We are interested in drawing a general picture of some graph families by determining, first, how many elements are there of a given possible size (graph enumeration), and secondly, what is the typical behaviour of an element of fixed size chosen uniformly at random, when the size tends to infinity (random graphs). The problems concern graphs subject to global conditions, such as being planar and/or with restrictions on the degrees of the verti
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13

García-Blanco, Raquel. "Efficient solvers for power flow equations : parametric solutions with accuracy control assessment." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/458887.

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The Power Flow model is extensively used to predict the behavior of electric grids and results in solving a nonlinear algebraic system of equations. Modeling the grid is essential for design optimization and control. Both applications require a fast response for multiple queries to a parametric family of power flow problems. Different solvers have been introduced especially designed for the algebraic nonlinear power flow equations, providing efficient solutions for single problems, even when the number of degrees of freedom is considerably large. However, there is no existing methodology provi
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Sanz, Perela Tomás. "Stable solutions of nonlinear fractional elliptic problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667164.

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This thesis is devoted to study integro-differential equations. This type of equations constitutes nowadays a very active field of research which has important applications in modeling real-life phenomena where nonlocal interactions appear. The most canonical example of integro-differential operators is the fractional Laplacian, which is the infinitesimal generator of a radially symmetric Lévy process. We are interested in the regularity and qualitative properties of stable solutions to semilinear equations. Such solutions are those at which the linearized operator associated to the equatio
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Sibileau, Alberto Pedro. "Computational vademecums for lattice materials using algebraic PGD." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667577.

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This dissertation is motivated by the concept of materials by design. Focusing on structures, this states that the properties in a mechanical component are not only inherited by its constituent material, but also by the shape in which this one is distributed in space. Although this notion has been developed for thousands of years in architecture, its relevance at a smaller scale has not been conceived until the arrival of additive manufacturing technologies. The materials by design approach is certainly multidisciplinary, from the study of the shape, its representation in CAD, to the final ma
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16

Bonilla, de Toro Jesús. "Monotonicity-preserving finite element methods for hyperbolic problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/668242.

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This thesis covers the development of monotonicity preserving finite element methods for hyperbolic problems. In particular, scalar convection-diffusion and Euler equations are used as model problems for the discussion in this dissertation. A novel artificial diffusion stabilization method has been proposed for scalar problems. This technique is proved to yield monotonic solutions, to be \ac{led}, Lipschitz continuous, and linearity preserving. These properties are satisfied in multiple dimensions and for general meshes. However, these results are limited to first order Lagrangian finite el
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17

Bayona, Roa Camilo Andrés. "Adaptive mesh simulations of compressible flows using stabilized formulations." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461769.

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This thesis investigates numerical methods that approximate the solution of compressible flow equations. The first part of the thesis is committed to studying the Variational Multi-Scale (VMS) finite element approximation of several compressible flow equations. In particular, the one-dimensional Burgers equation in the Fourier space, and the compressible Navier-Stokes equations written in both conservative and primitive variables are considered. The approximations made for the VMS formulation are extensively researched; the design of the matrix of stabilization parameters, the definition of t
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18

Pérez, Cervera Alberto. "On the role of oscillatory dynamics in neural communication." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666705.

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In this Thesis we consider problems concerning brain oscillations generated across the interaction between excitatory (E) and inhibitory (I) cells. We explore how two neuronal groups with underlying oscillatory activity communicate much effectively when they are properly phase-locked as suggested by Communcation Through Coherence Theory. In Chapter 1 we introduce the Wilson-Cowan equations (WC), a mean field model describing the mean activity of a network of a single population of E cells and a single popultation of I cells and review the bifurcations that give rise to oscillatory dynamics.
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19

Felipe, Navarro Juan Carlos. "Qualitative properties of solutions to integro-differential elliptic problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672313.

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The thesis is devoted to the analysis of elliptic PDEs and related problems. It is mainly focused on the study of qualitative and regularity properties of solutions to integro-differential equations. The study of such equations has attracted much attention recently since they arise naturally in different areas when dealing with processes where long range interaction phenomena appear. The canonical example of integro-differential operators is the fractional Laplacian, which is translation, rotation, and scale invariant. The thesis is divided into three parts. Part I concerns the study of unique
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20

Velona, Vasiliki. "A study on structure recovery and the broadcasting problem." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672697.

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The thesis contains a study of two problems of combinatorial statistics. The first one is structure learning for partial correlation graphs and the second one is the broadcasting problem on certain families of random recursive trees. In a precise language, the structure recovery problem that we study is the following: given access to individual entries of a covariance matrix S, learn the support of the inverse of S (let us denote this matrix by K) using only a small fraction of S. We call this problem ‘structure recovery’ since the zero-entries of K define the adjacency matrix of a graph (call
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21

Labra, C. A. (Carlos Andrés). "Advances in the development of the discrete element method for excavation processes." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/124837.

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Modelling of granular materials, soils and rocks has been a challenging topic of investigation for decades. Classical continuum mechanics has been used to idealize soils and rocks, and numerical solution techniques such as finite element method (FEM) has been used to model these materials. Considering the idealization of the material, continuum mechanics allows the analysis of phenomena with discontinuous nature such as fracture in rock or soil via damage models. However, in more complex processes like rock milling or crushing, this kind of models are usually not suitable. Discrete models are
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22

Garcia, Domingo Josep Lluís. "Real analysis in non-euclidean spaces: trees and spaces of homogeneous type." Doctoral thesis, Universitat de Barcelona, 2003. http://hdl.handle.net/10803/2124.

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DE LA TESIS:<br/><br/>El contenido de esta tesis se enmarca dentro del Análisis Real. En particular, trata del estudio de ciertos problemas de la teoría de pesos, (una referencia clásica sobre esta teoría es el libro de J. García-Cuerva y J.L. Rubio de Francia [GR]). Nosotros consideramos, por este orden, tres problemas clásicos diferentes, que abarcan buena parte de la teoría de pesos:<br/><br/>(i) Estudio de las inclusiones para espacios con pesos y acotación de operadores integrales entre estos espacios.<br/><br/>(ii) Estudio de propiedades funcionales de espacios con pesos asociados a una
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Padilla, Barreto Alemar Elaine. "Cuantificación del riesgo global del asegurado para mejorar la tarificación." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/666950.

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The first contribution of this Thesis is the creation of a new risk measure that allows to classify the clients according to the risk that they bring to the company. This measure defined from the aggregate information at the client level is easy to understand, implement and also takes into account the propensity to renew, the claims and the relationship between the different policies subscribed by the insured. Subsequently we focus on one of the factors that affect the risk measure defined previously, specifically in the analysis of the propensity to renewal, which is the second contribution
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Requejo, Castro David. "Data–driven Bayesian networks modelling to support decision–making : application to the context of Sustainable Development Goal 6 on water and sanitation." Doctoral thesis, Universitat Politècnica de Catalunya, 2021. http://hdl.handle.net/10803/672336.

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We live in a complexand interconnected world which permeates ditterent scales. sectors or decision problems. This fact is acknowledged by the United Nations 2030 Agenda for Sustainable Development, which underscores current global challenges, recognizes their interconnectivity and calls for international action. lt is recognized that the connected nature of the issues we currently face have been tackled by "silo" approaches, separating the complexities ofthe real-world into specialized disciplines. fields of research, institutions and ministries, each one focused on a fraction of the overa
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Zougari, Ayoub. "Estudio del comportamiento vibratorio de vías ferroviarias mediante simulación numérica." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/311432.

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In the last decades, the problem of the vibrations and the noise generated by the rolling and the undulatory wear has been approached by multiple research groups. These groups have developed studies with the intention of understanding and characterizing the vibrations problem, and its presented different analytical models. These models, for straight track sections, usually consider only half a track (single rail) in contact with a wheel suspended from the bogie through the primary suspension. Analytical models of half a track, although widely used, have the inconvenience of not considering the
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Asadipour, Nina. "Rheological models for tissue relaxation and fluidisation." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/392716.

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We present a cell-centred model for the simulation of multicellular soft tissues that takes into account the underlying active process at the cytoskeletal level, and allows for active and passive cell-cell reorganisation and intercalation. In the cell centred model, each cell is treated as a discrete entity and adjacent cell centres are connected by bar elements holding the rheological properties of cell-cell interactions. Cell-cell connectivity is determined with Delaunay triangulation of the cell-centres (nuclei). We use Voronoi tessellation and barycentric tessellation in order to represent
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27

Anaya, Vejar Maribel. "Design and validation of structural health monitoring system based on bio-inspired algorithms." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/396370.

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The need of ensure the proper performance of the structures in service has made of structural health monitoring (SHM) a priority research area. Researchers all around the world have focused efforts on the development of new ways to continuous monitoring the structures and analyze the data collected from the inspection process in order to provide information about the current state and avoid possible catastrophes. To perform an effective analysis of the data, the development of methodologies is crucial in order to assess the structures with a low computational cost and with a high reliability.
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Torres-Sánchez, Alejandro. "A theoretical and computational study of the mechanics of biomembranes at multiple scales." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/458248.

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Lipid membranes are thin objects that form the main separation structure in cells. They have remarkable mechanical properties; while behaving as a solid shell against bending, they exhibit in-plane fluidity. These two aspects of their mechanics are not only interesting from a physical viewpoint, but also fundamental for their biological function. Indeed, the equilibrium shapes of different organelles in the cell rely on the bending elasticity of lipid membranes. On the other hand, the in-plane fluidity of the membrane is essential in functions such as cell motility, mechano-adaptation, or for
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Olm, Serra Marc. "Scalable domain decomposition methods for finite element approximations of transient and electromagnetic problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/665814.

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The main object of study of this thesis is the development of scalable and robust solvers based on domain decomposition (DD) methods for the linear systems arising from the finite element (FE) discretization of transient and electromagnetic problems. The thesis commences with a theoretical review of the curl-conforming edge (or Nédélec) FEs of the first kind and a comprehensive description of a general implementation strategy for h- and p- adaptive elements of arbitrary order on tetrahedral and hexahedral non-conforming meshes. Then, a novel balancing domain decomposition by constraints (B
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Mondelo, González José María. "Contribution to the Study of Fourier Methods for Quasi-Periodical Functions and the Vicinity of the Collinear Libration Points." Doctoral thesis, Universitat de Barcelona, 2001. http://hdl.handle.net/10803/2106.

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This works has been organized in three parts. The first (Chapter 1 to 5) is dedicated to the development and study of a procedure for the accurate computation of frequencies, as well ans the related Fourier coefficients, of a quasi-periodical funcition. The second part of the work (Chapters 6 to 7) is devoted to the study to the dynamics in the vicinity of the collinear equilibrium points of the three-dimensional RTBP fo the Earth-Moon mass parameter. The third part consists in several appendices, which give some additional results that have been taken apart from the main text in order to impr
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Fontich, Julià Ernest. "Mesura del trencament de separatrius en famílies de difeomorfismes amb punts hiperbòlics." Doctoral thesis, Universitat de Barcelona, 1985. http://hdl.handle.net/10803/2120.

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Se consideran familias de difeomorfismos con un punto fijo parabólico para el valor cero del parámetro y un punto fijo hiperbólico para valores mayores que cero que tengan en este caso puntos homoclínicos asociados a las variedades invariantes del punto hiperbólico. Para estas familias se estudia la separación máxima entre estas variedades en una región fijada la cual da una medida cuantitativa de la falta de integrabilidad del difeomorfismo. En el caso diferenciable se obtiene que la separación es del orden de una potencia adecuada del parámetro (que se explicita). En el caso infinitamente
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Jorba, i. Monte Àngel. "On Quasiperiodic Perturbations of Ordinary Differential Equations." Doctoral thesis, Universitat de Barcelona, 1991. http://hdl.handle.net/10803/2122.

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In this work we study several topics concerning quasi-periodic time-dependent perturbations of ordinary differential equations. This kind of equations appear as models in many applied problems of Celestial Mechanics, and we have used, as an illustration, the study of the behaviour near the equilateral libration points of the real Earth-Moon system. Let us introduce this problem as a motivation. As a first approximation, suppose that the Earth and Moon arc revolving in circular orbits around their centre of masses, neglect the effect of the rest of the solar system and neglect the spherical ter
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Maratuech, Pinzás José Alfonso. "Modelo de gestión para la integración ciudad-puerto en función a la cadena logística en el puerto del Callao." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/397720.

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Since ancient times, the ports have had an irreplaceable role as places of material displacement and cultural contact. First, because there were no means far air transportation, which even today day is teasible only for high value and low volume commodities, and second, because the cities area of influence servad as key element in the interaction and integration of an articulated development plan between the port and the city. Over eighty percent of international trading of imports and exports is mobilized by seaway, which explains the importance and significance of ports as interface nades b
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Zhang, Yi. "Inventory and pricing management in probabilistic selling." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/665359.

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Context: Probabilistic selling is the strategy that the seller creates an additional probabilistic product using existing products. The exact information is unknown to customers until they receive the probabilistic products. This strategy is still a relatively new area for both researchers and practitioners. Many of the corresponding operations problems need to be solved to take full advantage of the opportunity of this innovative marketing strategy. However, limited attention has been paid to examining the inventory management of probabilistic selling from the perspective of Operations Manag
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Pacha, Andújar Juan Ramón. "On the quasiperiodic hamiltonian andronov-hopf bifurcation." Doctoral thesis, Universitat Politècnica de Catalunya, 2002. http://hdl.handle.net/10803/5830.

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Aquest treball es situa dintre del marc dels sistemes dinàmics hamiltonians de tres graus de llibertat. Allà considerem famílies d'òrbites periòdiques amb una transició estable-complex inestable: sigui L el paràmetre que descriu la família i suposarem que per a valors del paràmetre més petits que un cert valor crític, L', els multiplicadors característics de les òrbites periòdiques corresponents hi són sobre el cercle unitat, quan L=L' aquests col·lisionen per parelles conjugades (òrbita ressonant o crítica) i per L > L', abandonen el cercle unitat cap al pla complex (col·lisió de Krein amb s
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Lázaro, Ochoa José Tomás. "On Normal Forms and Splitting of Separatrices in Reversible Systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2003. http://hdl.handle.net/10803/5837.

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És difícil dibuixar una frontera, dins la Teoria de Sistemas Dinàmics, entre lleis de conservació i simetries doncs, sovint, les seves característiques es confonen. Un clar exemple d'aquest fenómen el constitueixen els sistemes Hamiltonians i els sistemes reversibles.<br/><br/>Breument, un sistema dinàmic es diu temps-reversible (o, per nosaltres, simplement reversible) si és invariant sota l'acció d'un difeomorfisme involutiu a l'espai i una inversió en el sentit del temps. és en aquest marc on cal situar aquesta memòria. Concretament, ens centrem en dos punts molt particulars: la Teoria de F
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Brossa, Piñero Lidia. "Aplicació de tècniques cromatogràfiques a la determinació d'alteradors endocrins en aigües." Doctoral thesis, Universitat Rovira i Virgili, 2004. http://hdl.handle.net/10803/8992.

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L'objectiu d'aquesta tesis és el desenvolupament de mètodes analítics per a la determinació i control d'un grup d'alteradores endocrins en mostres aquoses mediambientals. <br/><br/>Els mètodes desenvolupats es basen por una banda en la utilització de la cromatografia de gasos amb l'espectrometria de masses (GC-MS) amb diferents tècniques d'extracció, com són l'extracció en fase sòlida (SPE) i una tècnica de recent aparició, l'extracció amb barres magnètiques agitadores (SBSE). Aquests mètodes utilitzen tècniques d'injecció de grans volums (LVI) recentment desenvolupats per introduir l'extracte
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Olm, i. Miras Josep M. "Asymptotic Tracking with DC-to-DC Bilinear Power Converters." Doctoral thesis, Universitat Politècnica de Catalunya, 2004. http://hdl.handle.net/10803/5940.

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Avui en dia la conversió DC-AC té una important aplicació pràctica en el camp dels sistemes de potència ininterrompuda (SPI). Els convertidors commutats bàsics (el buck, lineal, i el boost i el buck-boost, no lineals) presenten una estructura molt simple, i al llarg dels últims quinze anys s'ha estudiat la possibilitat d'usar-los en esquemes de conversió DC-AC. <br/><br/>L'objectiu de la tesi és aconseguir que els convertidors DC-DC de potència bàsics puguin seguir referències alternes mitjançant el voltatge de sortida. També es desenvolupen esquemes robustos per tal d'eliminar l'efecte de pos
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Demirel, Gozde. "Foreign policy of turkey and spain versus middle east, after 2002. Transition to democracy and new international agents." Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/145484.

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Turkey and Spain experienced drastic changes after Second World War. Turkey started the occidentalization process, with the reforms made by Atatürk but today the country still has continued struggle somewhere between full democracy and authoritarianism. On the other hand Spain stands as a solid example of democratic consolidation. The focus of the thesis is to analyze the effects of democratic transition and consolidation to foreign policy decision making process. The idea is to properly examine similar and different cases in both states and see the results in decision making. In particular,
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Sanchis, Minguez Delia. "Espacios de funciones continuas con valores difusos." Doctoral thesis, Universitat Jaume I, 2019. http://hdl.handle.net/10803/666915.

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En esta tesis abordamos tres aspectos importantes de los espacios de funciones difusas que son continuas respecto a la métrica supremo cuando están dotados de las topologías más habituales en este contexto. Estudiamos su completitud, metrizabilidad y compacidad. Este último concepto está claramente relacionado con el teorema de Ascoli cuyo resultado generalizamos a un marco más amplio. Por otra parte, estudiamos los problemas de aproximación en los espacios de funciones difusas continuas, no solo utilizando redes neuronales, sino probando resultados más generales, tipo Stone-Weierstrass. Cabe
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Jorba, Jorba Lambert. "Intervals de marques." Doctoral thesis, Universitat de Barcelona, 2003. http://hdl.handle.net/10803/2107.

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El sistema de les marques s'enquadra dins del camp de l'anàlisi intervalar modal. <br/>En aquest context la tesi aporta un estudi de les operacions lineals, de la seva semàntica i sobretot de la seva operativitat quan les operacions es fan en un context no exacte com en el cas de les aritmètiques digitals. Aquest estudi de la operativitat conclou amb la necessitat d'establir un nou sistema intervalar que resolgui la problemàtica de la truncació en les operacions lineals, sistema que a la vegada resoldria el problema de la interpretació semàntica quan una mateixa variable apareix amb doble moda
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Albacete, Garcia Maria Eloisa. "Optimisation of wastewater treatment at ecoparc 2." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/553242.

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L'Ecoparc 2 és una empresa que es dedica al tractament de diferents residus sòlids urbans (fracció orgànica, envasos i resta). Es troba en funcionament des de l'any 2004 i es troba constantment en millora, innovant i optimitzant els seus processos. Disposa d'una planta de tractament d'aigües residuals MBR, que va ser dissenyada per concentracions més baixes de les que està tractant actualment. Encara que es va ampliar, el seu rendiment ha de ser revisat i optimitzat per assegurar una operació fiable. La digestió anaeròbia contribueix a més del 75 % del total de les aigües residuals produïdes
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Kunneriath, Madhavi. "Lower and Middle Palaeolithic lithic assemblages from southern Peninsular India: a geometric morphometric and classical approach to Large Cutting Tools." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672263.

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El subcontinent indi ofereix un gran potencial per contribuir als debats en curs sobre dispersions d’hominins i transicions tecnoculturals. Els jaciments de la vall de Malaprabha, al sud de l’Índia peninsular, proporcionen una perspectiva regional sobre els processos de transició entre el Paleolític inferior i el Paleolític mitjà. Es van triar tres conjunts, des del final de l'Aixelià fins al Paleolític mitjà, com a col·leccions clau i després es van comparar amb dos dels seus homòlegs del sud-est. Aquests conjunts, excavats o recollits en superfície, es troben en diversos Museus de l'Índ
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Mola, Arques Montserrat. "Desenvolupament de tècniques analítiques per a la determinació de radionúclids." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/123911.

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En aquesta present tesi doctoral s’han desenvolupat diferents mètodes analítics per a la determinació de la radionúclids individuals en mostres ambientals. Aquestes mostres estudiades són riques en radionúclids naturals i principalment, descendents de la cadena de decaïment del 238U, degut a que són subproductes o estan sota la influència de la indústria NORM. Aquest tipus de indústria treballa a partir de matèries primeres riques en radionúclids naturals, generant residus amb concentracions de radionúclids que poden augmentar de forma considerables les activitats de radiació naturals en el me
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Arboix, Alió Jordi. "Influencia de las variables contextuales y de juego en el rendimiento de los equipos de hockey sobre patines." Doctoral thesis, Universitat Ramon Llull, 2022. http://hdl.handle.net/10803/673671.

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L'hoquei sobre patins és un esport d'equip amb una llarga tradició històrica i reconegut èxit esportiu en el nostre territori, però amb escassa literatura científica. L'anàlisi de les variables de rendiment és cada vegada més utilitzat i acceptat pels entrenadors i esportistes. Per aquest motiu, conèixer els diferents indicadors i variables de rendiment de cada esport, i la seva influència en el resultat final, és de gran utilitat. L’objectiu d’aquesta tesi doctoral és analitzar la influència de les variables contextuals i de joc en l'hoquei sobre patins. Per assolir-ho, s'han estudiat difere
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Düzgün, Ali. "Carbon nanotube based potentiometric aptasensors for protein detection." Doctoral thesis, Universitat Rovira i Virgili, 2013. http://hdl.handle.net/10803/111166.

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El diagnóstico rápido de la mayoría de las enfermedades tiene una importancia vital para proporcionar el remedio adecuado y, por lo tanto, el control de problemas de salud. La detección rápida y selectiva de biomoléculas grandes, específicamente proteínas, es uno de los objetivos importantes en este campo. Las técnicas basadas en inmunoensayos son las más comúnmente utilizadas, aunque requieren un marcaje específico. Por lo general, estos métodos también requieren personal altamente capacitado y equipos complejos que se traduce en una metodología relativamente cara y lenta. En la presente t
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Nonell, Ramon. "El condicionament en les anàlisis factorials descriptives: l'anàlisi parcial interna i simultània." Doctoral thesis, Universitat Politècnica de Catalunya, 1992. http://hdl.handle.net/10803/6530.

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Santos, Rodríguez Cristian de. "Backanalysis methodology based on multiple optimization techniques for geotechnical problems." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/334179.

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Nowadays, thanks to the increase of computers capability to solve huge and complex problems, and also thanks to the endless effort of the geotechnical community to define better and more sophisticated constitutive models, the challenge to predict and simulate soil behavior has been eased. However, due to the increase in that sophistication, the number of parameters that define the problem has also increased. Moreover, frequently, some of those parameters do not have a real geotechnical meaning as they just come from mathematical expressions, which makes them difficult to identify. As a consequ
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Verdugo, Rojano Francesc. "Error assessment and adaptivity for structural transient dynamics." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/286745.

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The finite element method is a valuable tool for simulating complex physical phenomena. However, any finite element based simulation has an intrinsic amount of error with respect to the exact solution of the selected physical model. Being aware of this error is of notorious importance if sensitive engineering decisions are taken on the basis of the numerical results. Assessing the error in elliptic problems (as structural statics) is a well known problem. However, assessing the error in structural transient dynamics is still ongoing research. The present thesis aims at contributing on error a
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Bock, Montero Marina. "Web crippling and local buckling response of stainless steel sections." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/285582.

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This thesis examines the response of stainless steel members when subjected to transverse and normal forces triggering the instability phenomena called web crippling and local buckling, respectively. Currently, the part of Eurocode dealing with stainless steel, EN 1993-1-4 (2006) misses design provisions for web crippling and the applicability of some of its aspects is yet to be fully verified especially for application to ferritic stainless steel. The first part of the thesis laid in the development of design equations for the treatment of web crippling in stainless steel sections which are
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