Now showing items 1-20 of 66

• #### A multilevel active-clamped converter topology—Operating principle ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

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

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ﻿

(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 ...