Ara es mostren els items 1-20 de 47

  • 15. Sessió 4. De la teoria dels fractals i l'arquitectura d'Enric Miralles / Claudi Alsina 

    Alsina Català, Claudi (2009-07-07)
    Audiovisual
    Accés obert
  • 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)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    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. ...
  • A study of the scaling properties of rainfall in spain and its appropriateness to generate intensity-duration-frequency curves from daily records 

    Rodríguez Solá, Raúl; Casas Castillo, M. del Carmen; Navarro Bosque, Javier; Redaño Xipell, Angel (John Wiley & Sons, 2016-04-20)
    Article
    Accés obert
    A methodology based on the fractal properties of rainfall has been applied to obtain the intensity-duration-frequency, IDF, curves for 100 pluviometric Spanish stations over the Iberian Peninsula and the Balearic Islands ...
  • 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
    Accés obert
    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 de geometrías fractales para resonadores microstrip 

    Extremera Extremera, Manuel Jesus (Universitat Politècnica de Catalunya, 2016-02-25)
    Projecte/Treball Final de Carrera
    Accés obert
    Usage and popularity growth of communications satellites has increased the interest on filter synthesis research. Nowadays, the improvement of the trade-off between size, weight, cost and performance is the golden rule. ...
  • 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
    Accés obert
  • 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
    Accés obert
    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)
    Projecte Final de Màster Oficial
    Accés obert
    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
    Accés restringit per política de l'editorial
    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
    Accés obert
    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 ...
  • Complexity and predictability of the monthly Western Mediterranean oscillation index 

    Lana Pons, Francisco Javier; Burgueño Rivero, August; Martínez Santafé, Maria Dolors; Serra de Larrocha, Carina (Wiley, 2016-05)
    Article
    Accés obert
    The complexity, predictability and predictive instability of the Western Mediterranean Oscillation index (WeMOi) at monthly scale, years 1856-2000, are analysed from the viewpoint of monofractal and multifractal theories. ...
  • Dual-band Sierpinski fractal monopole antenna 

    Romeu Robert, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    A new top-loaded reduced-sized dual-band (1.9 GHz and 3.5 GHz) monopole antenna for wireless communications is presented. The antenna provides better than -15 dB input return loss and keeps the same radiation pattern over ...
  • 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
    Accés obert
    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 ...
  • 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 ...
  • 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
    Accés restringit per política de l'editorial
    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 ...
  • Fractal analysis and statistics of seismic generation rates: the example of the southern California 

    Lana Pons, Francisco Javier; Martínez Santafé, Maria Dolors; Amir Hosseini, Seyed; Serra de Larrocha, Carina (2017-06)
    Article
    Accés restringit per política de l'editorial
    The seismic generation rate, SGR, at southern California along the 1981–2007 recording period is analysed with the main purpose of finding out whether there exist some correlations between seismic activity before, after ...
  • Fractal design of multiband and low side-lobe arrays 

    Puente Baliarda, Carles; Pous Andrés, Rafael (1996-05)
    Article
    Accés obert
    Most array factor design techniques are highly dependent on the operating wavelength. In this paper, a novel technique based on fractal structures is described for multiband operation. The analysis is focused in two different ...
  • Fractal multiband antenna based on the sierpinski gasket 

    Puente Baliarda, Carles; Romeu Robert, Jordi; Pous Andrés, Rafael; García, X; Benítez, F (Institution of Electrical Engineers, 1996-01)
    Article
    Accés obert
    Experimental and computed results show a multiband behaviour over five bands for the new fractal Sierpinski antenna. Such a behaviour is based on the self-similarity properties of the antenna's fractal shape, which might ...
  • 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
    Accés obert
    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 ...
  • High directivity modes in the koch island fractal patch antenna 

    Romeu Robert, Jordi; Borja Borau, Carmen; Blanch Boris, Sebastián (Institute of Electrical and Electronics Engineers (IEEE), 2000)
    Text en actes de congrés
    Accés obert
    The article shows that a patch antenna with fractal boundary exhibits, at a frequencies above the fundamental mode, localized modes. These modes can have broadside directive patterns. As an example of this phenomenon ...