Now showing items 1-20 of 28

  • A microstrip array operating in a fracton mode [fractal geometry] 

    Anguera Pros, Jaume; Montesinos, Gemma; Puente Baliarda, Carles; Borja, C.; Soler, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2003)
    Conference report
    Restricted access - publisher's policy
    A high-directivity microstrip array using multilevel elements based on a fractal geometry is theoretically compared with one using a circular patches. Within the same electrical area, the same directivity can be obtained. ...
  • An iterative model for fractal antennas: application to the Sierpinski gasket antenna 

    Puente Baliarda, Carles; Borja Borau, M.Carmen; Navarro Rodero, Mònica; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-05-31)
    Article
    Open Access
    A simple model that explains the behavior of the Sierpinski fractal antenna is presented. This model shows that the multiband behavior of the Sierpinski fractal antenna is a consequence of its fractal nature. The model is ...
  • Análisis multifractal de procesos autosimilares : imágenes de satélite e inestabilidades baroclinas 

    Redondo Apraiz, José Manuel; Busquets Grau, Juan; Platónov, Alexéi Konstantínovich; Garzón Bedoya, Germán (2008-05-05)
    Article
    Open Access
  • Atmospheric-turbulence-induced power-fade statistics for a multiaperture optical receiver 

    Belmonte Molina, Aniceto; Comerón Tejero, Adolfo; Rubio, Juan Antonio; Fernández (OPTICAL SOC AMER, 1997-01-31)
    Article
    Open Access
    To estimate the probability distributions of power fades, we consider two basic types of disturbance in electromagnetic wave propagation through atmospheric turbulence: wave-front intensity fluctuations and wave-front ...
  • Automatic Computation of Potential Tumor Regions in Cancer Detection using Fractal analysis techniques 

    Orellana Bech, Bernat (Universitat Politècnica de Catalunya, 2009-09-08)
    Master thesis
    Open Access
    Radiology is one of the most active and technologically advanced fields in medicine. It was born from the most advanced physics concepts, and it became a reality thanks to the state-of-the art of electronics and computer ...
  • Breakage of an artificial crushable material under loading 

    Casini, Francesca; Viggiani, Giulia M.B.; Springman, Sarah Marcella (2013-10)
    Article
    Restricted access - publisher's policy
    The mechanical behaviour of granular materials depends on their grading. Crushing of particles under compression or shear modifies the grain size distribution, with a tendency for the percentage of fine material to increase. ...
  • Comments on "On the relationship between fractal dimension and the performance of multi-resonant dipole antennas using Koch curves" 

    González Arbesú, José María; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-06-30)
    Working paper
    Open Access
    Comentaris referits a l'article següent: K. J. Vinoy, J. K. Abraham, and V. K. Varadan, “On the relationship between fractal dimension and the performance of multi-resonant dipole antennas using Koch curves,” IEEE ...
  • De la teoria dels fractals i l'arquitectura d'Enric Miralles 

    Alsina Català, Claudi (2009-07-07)
    Audiovisual
    Open Access
  • Edge effect causes apparent fractal correlation dimension of uniform spatial raindrop distribution 

    Uijlenhoet, Remko; Porra, J. M.; Sempere Torres, Daniel; Creutin, Jean-Dominique (University of Thechnology and Agriculture Nicholas Copernicus University, 2009-04)
    Article
    Open Access
    Lovejoy and Schertzer (1990a) presented a statistical analysis of blotting paper observations of the (twodimensional) spatial distribution of raindrop stains. They found empirical evidence for the fractal scaling behavior ...
  • Filtered deterministic waves and analysis of the fractal dimension of the components of the wind velocity 

    Tijera, Manuel; Cano Marchante, Jose Leandro; Cano, Darío; Bolster, Diogo; Redondo Apraiz, José Manuel (2009-03-29)
    Article
    Restricted access - publisher's policy
    The difficulty in developing models for waves in turbulent flows is a key problem in the analysis of the complexity of turbulence. We present a method to find and filter perturbations that are generated by the flow of ...
  • Geometría fractal.Una nueva herramienta para el desarrollo del diseño textil. Aplicaciones en la estampación. 

    Neves, Jorge; Neves, Manuela; Janssens, Katja (Instituto de Investigación Textil y Cooperación Industrial, 1994-01)
    Article
    Open Access
    En este articulo se presenta el proceso completo de diseno, comenzando por un diseño creado con la percepción matemática de la Geometría Fractal y continuando con la introducción de estas imágenes en los sistemas CAD y su ...
  • Hilbert fractal curves for HTS miniaturized filters 

    Barra Bizinotto, Marilda; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2004)
    Conference report
    Open Access
    This work presents novel compact High Temperature Superconductor (HTS) microstrip resonators based on Hilbert fractal curves. Their miniaturization performance has been investigated, emphasizing the parameters which allow ...
  • How much can be reduced the internal FM antenna of mobiles phones? 

    Borja, C.; Anguera Pros, Jaume; Puente Baliarda, Carles; Vergés, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2010)
    Conference report
    Open Access
    The paper introduces both a new internal FM antenna for mobile phones based on the fractal Hilbert curve, and a new evaluation criterion for quantifying the quality of the signal received by the FM antenna of mobile phones. ...
  • Introducción a los fractales 

    Alonso Tamayo, Juan Carlos (Escola Tècnica Superior d'Enginyers de Telecomunicació de Barcelona, 1995)
    Article
    Open Access
  • La geometría fractal en el diseño textil: desarrollo de un programa computacional. 

    Palominos, Pedro Iván; González, Nayarett (Instituto de Investigación Textil y Cooperación Industrial, 1994-07)
    Article
    Open Access
    El presente trabajo apunta a la activación del proceso de creación de nuevos diseños textiles, basados en la geometría de fractales. Desarrollando para ello un programa computacional que facilite la creación de nuevos ...
  • Linear and nonlinear analyses of EEG dynamics during non-painful somatosensory processing in chronic pain patients 

    Sitges, Carolina; Bornas, Xavier; Llabrés, Jordi; Noguera Batlle, Miquel; Montoya, Pedro (2010-08)
    Article
    Restricted access - publisher's policy
    The aim of our study was to characterize brain dynamics of affective modulation of somatosensory processing in chronic pain. We hypothesized that chronic pain patients will show abnormal EEG activity under negative mood ...
  • Log-periodic optical antennas 

    Pavlov, Radostin Stefanov (Universitat Politècnica de Catalunya, 2011-09-07)
    Master thesis
    Open Access
    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 ...
  • Los fractales y su contribución al diseño de estampados textiles. 

    Hernández, F.; Palominos, Pedro Iván; Orellana, Marylin; Ochoa Vives, Manuel (Instituto de Investigación Textil y Cooperación Industrial, 1996-01)
    Article
    Open Access
    En el presente trabajo se emplean los Conjuntos de Julia y Sistemas de Función Iterada, para explorar su aplicación en el diseño de nuevas formas orientadas al estampado textil. Para ello, se presentan una metodología y ...
  • Method of moments enhancement technique for the analysis of Sierpinski pre-fractal antennas 

    Parrón Granados, Josep; Romeu Robert, Jordi; Rius Casals, Juan Manuel; Mosig, Juan R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-08-31)
    Article
    Open Access
    The numerical analysis of highly iterated Sierpinski microstrip patch antennas by method of moments (MoM) involves many tiny subdomain basis functions, resulting in a very large number of unknowns. The Sierpinski ...
  • Metodologia fractal como estrategia de crecimiento urbano 

    Unibazo Carrilo, Marcelo; Suazo Peña, Bernardo (Centre de Política de Sòl i Valoracions, 2009-06)
    Conference report
    Open Access
    Uno de los grandes problemas del crecimiento urbano de nuestras ciudades, es la falta de núcleos o centros en zonas periféricas que sean capaces de absorber las demandas básicas de la población y que den respuesta a las ...