Now showing items 1-20 of 66

    • A multilevel active-clamped converter topology—Operating principle 

      Busquets Monge, Sergio; Nicolás Apruzzese, Joan (IEEE Press. Institute of Electrical and Electronics Engineers, 2011-09)
      Article
      Restricted access - publisher's policy
      This paper presents a novel multilevel activeclamped converter topology, which is an extension to m levels of the three-level active neutral-point-clamped topology. The operating principle is established through the ...
    • A new method for ionospheric tomography and its assessment by ionosonde electron density, GPS TEC, and single-frequency PPP 

      Prol, Fabricio dos Santos; Camargo, Paulo de Oliveira; Hernández Pajares, Manuel; Honorato Muella, Marcio Tadeu de Assis (Institute of Electrical and Electronics Engineers (IEEE), 2019-01-05)
      Article
      Open Access
      A new tomographic method was developed with the main goal of mapping the ionosphere in the region of Brazil. The ionospheric background was estimated based on ionosonde and radio-occultation measurements to overcome the ...
    • A note on the periodic orbits and topological entropy of graph maps 

      Alseda Soler, Lluís; Juher, D.; Mumbrú i Rodriguez, Pere (2000)
      Article
      Open Access
      This paper deals with the relationship between the periodic orbits of continuous maps on graphs and the topological entropy of the map. We show that the topological entropy of a graph map can be approximated by the entropy ...
    • Active redundant submodule configuration in modular multilevel converters 

      Konstantinou, Georgios; Pou Félix, Josep; Ceballos Recio, Salvador; Agelidis, Vassilios (2013-09)
      Article
      Restricted access - publisher's policy
      The modular multilevel converter (MMC) is based on the cascaded connection of identical submodules (SMs) enabling additional redundancies. This paper proposes the configuration of the MMC topology with redundant SMs and ...
    • Analysis and simulation of optical switches for intra-datacenter networks 

      Adetupe Osemwengie, Odiri (Universitat Politècnica de Catalunya, 2018-06)
      Bachelor thesis
      Open Access
      Este proyecto consiste en realizar un estudio de factibilidad para las interconexiones dentro de un centro de datos. Hay tantos diseños de arquitectura de una red de centro de datos (DCN), que es uno de los más básicos y ...
    • Análisis de armónicos de la marea astronómica con datos obtenidos por dos mareógrafos situados dentro del Puerto de Barcelona 

      Garrido Lirio, Jordi (Universitat Politècnica de Catalunya, 2015-04)
      Bachelor thesis
      Restricted access - author's decision
    • Application of Cauchy's equation in combinatorics and genetics 

      Kannappan, Palaniappan (Universitat Politècnica de Catalunya. Secció de Matemàtiques i Informàtica, 2001)
      Article
      Open Access
      We are familiar with the combinatorial formula $\left(\begin{array}{cc} n\\ r \end{array}\right) = \frac{n(n-1) \cdots (n - r + 1)}{r !} = $ number of possible ways of choosing $r$ objects out of $n$ objects\,. In ...
    • Aproximación a una taxonomía topológica de formas arquitectónicas y urbanas 

      Millán Gómez, Antonio (Universitat Politècnica de Catalunya, 1981-10-01)
      Doctoral thesis
      Open Access
      Consta de tres partes: a) Una aclaración de los conceptos de forma arquitectónica y forma urbana aquella elaborada a partir de la crítica arquitectónica reciente y de los tratados clásicos junto con una revisión de esta ...
    • Axiomatic definition of the topological entropy on the interval 

      Alseda Soler, Lluís; Kolyada, Sergi; Llibre Saló, Jaume; Snoha, Lubomír (2000)
      Article
      Open Access
      Summary. The aim of this paper is to give an axiomatic definition of the topological entropy for continuous interval maps and, in such a way, to shed some more light on the importance of the different properties of the ...
    • Bandwidth-enhancement g(m)-C filter with independent omega(O) and Q tuning mechanisms in both topology and control loops 

      Martínez García, Herminio; Vidal López, Eva María; Cantó, Andrea; Poveda López, Alberto; Guinjoan Gispert, Francisco (2010)
      Conference lecture
      Restricted access - publisher's policy
      This paper deals with the proposal of a new topology for a gm-C continuous time filter which allows the adjustment and tuning of its characteristic parameters (ωO and Q) in an independent way (without cross-tuning), thereby ...
    • Bandwidth-Enhancement gm-C Filter with Independent wo and Q Tuning Mechanisms in Both Topology and Control Loops 

      Martínez García, Herminio; Vidal López, Eva María; Poveda López, Alberto; Guinjoan Gispert, Francisco (2010-06)
      Conference report
      Open Access
      This paper deals with the proposal of a new topology for a gm-C continuous time filter which allows the adjustment and tuning of its characteristic parameters (ωO and Q) in an independent way (without cross-tuning), thereby ...
    • Bounds of the sum of edge lengths in linear arrangements of trees 

      Ferrer Cancho, Ramon; Gómez Rodríguez, Carlos; Esteban Ángeles, Juan Luis (Institute of Physics (IOP), 2021-02-11)
      Article
      Restricted access - publisher's policy
      A fundamental problem in network science is the normalization of the topological or physical distance between vertices, which requires understanding the range of variation of the unnormalized distances. Here we investigate ...
    • Chromatic monitoring of gear mechanical degradation based on acoustic emission 

      Delgado Prieto, Miquel; Zurita Millán, Daniel (Institute of Electrical and Electronics Engineers (IEEE), 2017-11-01)
      Article
      Open Access
      This paper presents a methodology for the feature estimation of a new fault indicator focused on detecting gear mechanical degradation under different operating conditions. Preprocessing of acoustic emission signal is ...
    • Commensurations and metric properties of Houghton's groups 

      Burillo Puig, José; Cleary, Sean; Martino, Armando; Röver, Claas E. (2016-12-01)
      Article
      Open Access
      We describe the automorphism groups and the abstract commensurators of Houghton’s groups. Then we give sharp estimates for the word metric of these groups and deduce that the commensurators embed into the corresponding ...
    • Comparative study of goodness of topology optimization software on additive manufactured parts 

      Pallarès Vendrell, Pau (Universitat Politècnica de Catalunya, 2020-07-15)
      Master thesis
      Open Access
      La introducció de la fabricació additiva (AM) ha eliminat la majoria de les restriccions de fabricació que impliquen els mètodes tradicionals. Per això, l'interès per les tècniques de disseny basades en algoritmes ...
    • Completeness properties of locally quasi-convex groups 

      Bruguera Padró, Maria Montserrat; Chasco Ugarte, Maria Jesús; Martín Peinador, Elena; Tarieladze, V. I. (Vazha Izemovich) (1999)
      Article
      Open Access
      It is natural to extend the Grothendieck Theorem on completeness, valid for locally convex topological vector spaces, to abelian topological groups. The adequate framework to do it seems to be the class of locally ...
    • Computing the topology of planar semi-algebraic sets 

      Cucker Farkas, Juan Felipe; Rosselló Llompart, Francesc A. (1990)
      External research report
      Open Access
      In this note we give a new algorithm for computing the topological type of a planar semi-algebraic set that run in time О(m super 4 n super 19 (log n) super 3) where M is the number of polynomials defining the set and n ...
    • Connectivity-preserving transformations of binary images 

      Bose, Prosenjit; Dujmovic, Vida; Hurtado Díaz, Fernando Alfredo; Morin, Pat (2009-10)
      Article
      Open Access
      A binary image $\emph{I}$ is $B_a$, $W_b$-connected, where $\emph{a,b}$ ∊ {4,8}, if its foreground is $\emph{a}$-connected and its background is $\emph{b}$-connected. We consider a local modification of a $B_a$, $W_b$-connected ...
    • Detecting topology through dynamics in interacting fermionic wires 

      Haller, Andreas; Massignan, Pietro Alberto; Rizzi, Mateo (American Physical Society, 2020-08-05)
      Article
      Open Access
      Probing the topological invariants of interacting systems stands as a grand and open challenge. Here we describe a dynamical method to characterize 1D chiral models, based on the direct observation of time-evolving bulk ...
    • Diseño y planificacion de la red de datos de un colegio con capacidad de 860 personas y 3060 m2 edificados 

      Domínguez Sagra, Verónica (Universitat Politècnica de Catalunya, 2011-03-25)
      Bachelor thesis
      Open Access
      El objetivo principal de este proyecto es realizar el diseño de de la red de voz y datos del colegio CEIP. Plaça dels Països Catalans., ubicado en Lleida. Inicialmente se han especificado los requisitos principales que ...