Browsing by Subject "Anàlisi espectral"
Now showing items 1-20 of 181
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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 note on prediction of maize stover qualityby near-infrared reflectance spectroscopy (NIRS)technique
(1997-10-24)
Article
Open AccessNear-infrared reflectance spectroscopy (NIRS) technique was investigated as a means of predicting quality parameters in semi-exotic maize stover. These parameters included neutral detergent fibre (NDF) and in vitro dry ... -
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
Open AccessBinder-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 ... -
Analysis and implementation of approximate operators for digital processing
(Universitat Politècnica de Catalunya, 2022-10-26)
Bachelor thesis
Open AccessToday the use of arithmetic operators is present in all fields of electronics and is used by a very wide range of technologies. Typically, these arithmetic circuits have always stood out for having high time response and ... -
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 la cinemática de un talud
(Universitat Politècnica de Catalunya, 2024-10-23)
Master thesis
Open AccessAquest treball final de màster (TFM) aborda un projecte real a Barcelona lligat a l'enginyeria civil on es vol estudiar l'evolució del moviment d'un talús inestable mitjançant l'anàlisi de les dades d'auscultació. Aquest ... -
Análisis espectral de series meteorológicas
(1981)
Conference report
Open Access
