Exploració per tema "Fourier transformations"

Ara es mostren els items 1-20 de 21

    • Acoustic emission analysis for the detection of appropriate cutting operations in honing processes 

      Buj Corral, Irene; Álvarez Flórez, Jesús Andrés; Domínguez Fernandez, Alejandro (2018-01-15)
      Article
      Accés obert
      In the present paper, acoustic emission was studied in honing experiments obtained with different abrasive densities, 15, 30, 45 and 60. In addition, 2D and 3D roughness, material removal rate and tool wear were determined. ...

    • An FFT-based CLEAN deconvolution method for interferometric microwave radiometers with spatially variable beam pattern 

      Sugihara El Maghraby, Ahmed Kiyosi; Hyuk, Park; Camps Carmona, Adriano José; Grubišic, Angelo; Colombo, Camilla; Tatnall, Adrian (Institute of Electrical and Electronics Engineers (IEEE), 2021-02-01)
      Article
      Accés restringit per política de l'editorial
      A modification to the extended CLEAN deconvolution method for passive microwave interferometric radiometers is presented to account for the interferometer beam patterns that vary depending on the source position within the ...

    • Analysis of signal processing techniques for high impedance fault detection in distribution systems 

      Nunes Lopes, Gabriela; Albernaz Lacerda Freitas, Vinícius; Melo Vieira, José Carlos; Coury, Denis V. (Institute of Electrical and Electronics Engineers (IEEE), 2021-12)
      Article
      Accés restringit per política de l'editorial

    • Artificial Intelligence to the end-device 

      Pons Martí, Xavier (Universitat Politècnica de Catalunya, 2023-07-05)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      The aim of this thesis is to develop an efficient and high-performing Neural Network model for enhancing keyword spotting systems (KWS) on devices with limited resources. After extensive research and experimentation, ...

    • Automatic measurements of partial cover factors and yarn diameters in fabrics using image processing 

      Tàpias Anton, Montserrat; Rallo Capdevila, Miguel; Escofet Soteras, Jaume (2011-01)
      Article
      Accés restringit per política de l'editorial

    • Built in dampers for stayed cables in bridges via SMA. The SMARTeR-ESF project: a mesoscopic and macroscopic experimental analysis with numerical simulations 

      Torra Ferré, Vicenç; Auguet Sangrá, Carlota E.; Isalgué Buxeda, Antonio; Carreras, Guillem; Terriault, Patrick; Lovey, Francisco Carlos (Elsevier, 2013-04)
      Article
      Accés obert
      Shape Memory Alloys (SMAs) are good candidates for solid-state dampers appropriate for the oscillations of bridge stay cables because of their large recoverable strain, hysteresis and reasonable fatigue-life. This work ...

    • Cleaning and measuring tools using digital image processing methods 

      Torres Xirau, Iban (Universitat Politècnica de Catalunya / Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik, 2013-07-31)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Technische Universität Berlin
      [ANGLÈS] Many industrial machines use screws and other small tools to fix smaller components that compose the whole structure of the machine. To ensure that these tools withstand the pressures that can be subjected at, a ...

    • Deterministic analysis of the accuracy in FFT hardware architectures 

      Guinart Platero, David (Universitat Politècnica de Catalunya / Linköpings Universitet, 2012-06-07)
      Projecte/Treball Final de Carrera
      Accés obert
      [ANGLÈS] This Master Thesis studies the different quantization effects in hardware architecture due to the use of finite word lenght. This master thesis gives a deterministic analysis with relation to the accuracy and ...

    • Deterministic thermal lanscape engineering at the microscale level by optical beam shaping with phase-only hologram 

      Lebon, Alexander (Universitat Politècnica de Catalunya, 2018-09-06)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      An optical beam shaping system based on a phase-only spatial light modulator (SLM) was integrated into a holographic optical microscope developed to deliver heat locally and measure the resulting temperature in a label-free ...

    • Double image encryption system using a nonlinear joint transform correlator in the Fourier domain 

      Pérez, Ronal A; Pérez Cabré, Elisabet; Vilardy Ortiz, Juan Manuel; Millán Garcia-Varela, M. Sagrario; Torres Moreno, Cesar Orlando (Multidisciplinary Digital Publishing Institute (MDPI), 2023-02-02)
      Article
      Accés obert
      In this work, we present a new nonlinear joint transform correlator (JTC) architecture in the Fourier domain (FD) for the encryption and decryption of two simultaneous images. The main features of the proposed system are ...

    • Estudio de la previsión de las series de tráfico por medio de la transformada Wavelet 

      Gelabert Serra, Juan (Universitat Politècnica de Catalunya, 2016-10)
      Projecte/Treball Final de Carrera
      Accés obert
      Nowadays, the amount of information that communications networks support due to its rise, makes necessary the distribution of different information flows, to avoid saturation and information lose. This project aims to ...

    • Generalized formulation of an encryption system based on a joint transform correlator and fractional Fourier transform 

      Vilardy Ortiz, Juan Manuel; Torres, Yezid; Millán Garcia-Varela, M. Sagrario; Pérez Cabré, Elisabet (Institute of Physics (IOP), 2014-12-01)
      Article
      Accés obert
      We propose a generalization of the encryption system based on double random phase encoding (DRPE) and a joint transform correlator (JTC), from the Fourier domain to the fractional Fourier domain (FrFD) by using the fractional ...

    • Implementación y análisis de transformadoras de Fourier para protein-docking en cell BE 

      González Alvárez, Cecilia M. (Universitat Politècnica de Catalunya, 2007-06-27)
      Projecte/Treball Final de Carrera
      Accés obert

    • Implementation and analysis of super-resolution image techniques 

      Beaus Iranzo, Pablo (Universitat Politècnica de Catalunya, 2022-07-05)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Politecnico di Milano
      Super-Resolution (SR) is a branch of deep learning aiming at improving the resolution of an image preserving as much detail as possible. This technology applied to overhead imagery has been on the rise in the recent years, ...

    • Log-periodic optical antennas 

      Pavlov, Radostin Stefanov (Universitat Politècnica de Catalunya, 2011-09-07)
      Projecte Final de Màster Oficial
      Accés obert
      English: In recent years optical antennas have been attracting very strong interest due to the unique possibilities they offer for manipulating light on a sub-wavelength scale. Most published work deals with relatively ...

    • Mean field study of doubly Dipolar Bose condensates 

      Pereira Lladó, Iker (Universitat Politècnica de Catalunya, 2023-07-10)
      Treball Final de Grau
      Accés obert
      Study of the behavior and configurations of a weakly interacting Bose-Einstein condensate under the influence of doubly dipolar interactions.

    • Non-linear spectral estimation 

      Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1987)
      Text en actes de congrés
      Accés obert
      This work describes the use of constraints in variational procedures for spectral analysis. It is reported how the designer in a variational approach for spectral estimation has to select a set of constraints. At the same ...

    • Optical warning of bicycle riders concerning motorized vehicles closing from behind using the smartphone microphone 

      Talaya Vidal, Alba (Universitat Politècnica de Catalunya, 2022-02-02)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Technische Universität Wien
      Deaf cyclists do not receive acoustic warnings of motor vehicles approaching from behind. This can be very dangerous because they can get startled and wobble, making them loose stability and more exposed to possible ...

    • Rayleigh estimates: performing like SVD 

      Lagunas Hernandez, Miguel A.; Cabrera-Bean, Margarita (1988)
      Text en actes de congrés
      Accés obert
      This paper describes the structure of the so- called Rayleigh estimates and the features they share with indirect SVD like procedures. The problem of finding procedures of high resolution in spectral estimation is faced ...

    • Simulation of an OFDM system for a Wireless Battery Management System 

      Gaitán Gutiérrez, Fernando (Universitat Politècnica de Catalunya, 2014-11-20)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Karlsruher Institut für Technologie
      [ANGLÈS] With the aim of innovating a new physical layer that can be used as an alternative to the standard of the Battery Management System (BMS, CAN-Bus), wireless approach proposes a new BMS communication system to ...