Browsing by Subject "Anàlisi espectral"
Now showing items 1-20 of 123
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A first study on an oscillatory flow enclosed in a finite cylinder
(Universitat Politècnica de Catalunya, 2009-09-14)
Master thesis
Open AccessIn this preliminar work, an oscillatory flow contained in a closed cylinder is investigated by means of spectral methods. The problem is quite related with the Stokes boundary layer and the major phenomena belong to this ... -
A flatness-based generalized optimization approach to spectral estimation
(1990-04)
Article
Open AccessIn the optimization formulation, once the known autocorrelations are fixed as constraints, the objective functional completely characterizes the corresponding method of spectral estimation. After observing that this ... -
A new spectral method for latent variable models
(2018-05-22)
Article
Open AccessWe present an algorithm for the unsupervised learning of latent variable models based on the method of moments. We give efficient estimates of the moments for two models that are well known, e.g., in text mining, the ... -
A simple proof of the spectral excess theorem for distance-regular graphs
(Elsevier, 2010-04-15)
Article
Restricted access - publisher's policyThe spectral excess theorem provides a quasi-spectral characterization for a (regular) graph Γ with d+1 distinct eigenvalues to be distance-regular graph, in terms of the excess (number of vertices at distance d) of each ... -
A simple spectrum estimation technique based on the analytic cepstrum
(1990)
Conference report
Open Access -
A single-residue substitution inhibits fibrillization of Ala-based pentapeptides. A spectroscopic and molecular dynamics investigation
(2014-01-01)
Article
Open AccessThe aggregation properties of two Ala-based pentapeptides were investigated by spectroscopic techniques and molecular dynamics (MD) simulations. The two peptides, both functionalized at the N-terminus with a pyrenyl group, ... -
Additional constraints in variational procedures for ARMA Spectral Estimation
(1986)
Conference report
Open AccessA new variational ARMA power spectral estimation procedure is proposed. The resulting is a generalization of the ARMA estimation method proposed by Lagunas et al. [1] which used correlation and cepstral constraints. The ... -
Algoritmo iterativo de propagación espectral para el cálculo de RCS en cavidades conductoras
(1992)
Conference report
Open AccessOne of the most difficult problems in the RCS prediction of a complex target is the analysis of the cavities existing at the air inlets and outlets of engines. The geometrical complexity of these structures makes difficult ... -
Ammonia decomposition over 3D-printed CeO2 structures loaded with Ni
(2020-02-05)
Article
Restricted access - publisher's policyBinder-free ceria pastes have been formulated and used to prepare ceria structures with a woodpile arrangement of microchannels through 3D printing. After loading them with nickel, these catalytic structures have been ... -
An improved maximum likelihood method for power spectral density estimation
(1984-02)
Article
Open Access -
Analog Signal Adquisition and FFT Application for a Linux Embeded System Lab
(Universitat Politècnica de Catalunya, 2014-05)
Master thesis (pre-Bologna period)
Open Access[ANGLÈS] The project goal is to design a platform based on an existing HW/SW embeded Linux system containing a FPGA, within an academic environment. To accomplish that objective, a specific application for signal Adquisition ... -
Analytic solution of a static scale-free network model
(Springer, 2005-04-20)
Article
Open AccessWe present a detailed analytical study of a paradigmatic scale-free network model, the Static Model. Analytical expressions for its main properties are derived by using the hidden variables formalism. We map the model into ... -
Anàlisi de viabilitat i desenvolupament d'una app d'edició d'àudio
(Universitat Politècnica de Catalunya, 2016)
Master thesis (pre-Bologna period)
Open AccessThis project consists on the design and implementation of an audio editing tool for Android devices, with similar features that we can find in operating systems like Linux, Windows or Mac. This app should have the basic ... -
Análisis de problemas de dispersión mediante técnicas espectrales
(1998)
Conference report
Open AccessA method for the analysis of multiple scattering problems, valid both for open-space and guided problems is presented in this paper. The scatterers are first characterised individually by means of a transfer function, and ... -
Análisis de reflexiones múltiples entre superficies curvas mediante técnicas espectrales
(1994)
Conference report
Open AccessThis paper analyzes the reflected fields produced by parabolic and hyperbolic surfaces when an electromagnetic field falls into them. Multireflector antennas, which are integrated by such reflecting surfaces, are studied ... -
Análisis del contenido espectral de modulaciones de ancho de pulso para inversores fotovoltaicos multinivel conectados a red
(Universitat Politècnica de Catalunya, 2012-05-30)
Master thesis (pre-Bologna period)
Open Access[ANGLÈS] Study of the harmonic spectrum on various pulse width modulation strategies for multilevel converters, and how it affects the distortion on the converters. -
Análisis espectral de series meteorológicas
(1981)
Conference report
Open Access -
Anomalies detection in the infrared spectrum of Plasma Physics at Weldenstein 7-X
(Universitat Politècnica de Catalunya, 2019-06-27)
Bachelor thesis
Open AccessLas energías renovables son el futuro, y el estudio de estas todavía está en investigación y desarrollo. Los reactores de fusión pueden dar paso a un nuevo mundo dentro de la energía nuclear, muy diferente del que conocemos ... -
Aplicación de la espectroscopía de infrarrojo para el estudio de procesos de cristalización y polimerización. Aplicación de nuevos materiales derivados de ácido glicólico
(Universitat Politècnica de Catalunya, 2009-11)
Master thesis (pre-Bologna period)
Open AccessEn el presente Proyecto Final de Carrera se realiza la síntesis de las sales de sodio, potasio y cesio del ácido N-cloroacetil-6-aminohexanoico y se estudia su reactividad mediante espectroscopia de infrarrojo de reflexión ... -
Arbre de partition binaire: Un nouvel outil pour la représentation hiérarchique et l’analyse des images hyperspectrales
(2011)
Conference report
Restricted access - publisher's policyThis problem discusses here is the hierarchical representation and processing of the hyperspectral imaging. In this framework, Binary Partition Trees (BPTs) are proposed as new hierarchical region-based representation. ...
