Enviaments recents

  • Adaptive us-mrac for disturbance cancellation 

    Bertran Albertí, Eduardo; Montoro López, Gabriel (Institution of Electrical Engineers, 1995-01)
    Article
    Accés obert
    A variable structure, model reference adaptive control (VS-MRAC) devoted to cancel interferences without the requirement of an auxiliary input is proposed. This method is an improved alternative to the strategies recently ...
  • Two-dimensional solitons with second-order nonlinearities 

    Torner Sabata, Lluís; Menyuk, Curtis; Torruellas, William; Stegeman, George (1995-01)
    Article
    Accés restringit per política de l'editorial
    We investigate the propagation of intense Gaussian beams in materials with quadratic nonlinearity. Excitation of (2 + 1) solitons is numerically predicted at finite phase mismatch and in the presence of linear walk-off ...
  • Sample cumulants of stationary processes: asymptotic results 

    Rodríguez Fonollosa, José Adrián (1995-04)
    Article
    Accés obert
    In this paper, we present the formulas of the covariances of the second-, third-, and fourth-order sample cumulants of stationary processes. These expressions are then used to obtain the analytic performance of FIR system ...
  • Bright solitons with second-order nonlinearities 

    Torner Sabata, Lluís; Menyuk, Curtis; Stegeman, George (1995-05)
    Article
    Accés restringit per política de l'editorial
    We investigate the mutual trapping of intense fundamental and second-harmonic waves propagating in materials with second-order nonlinearity. Consistent with Menyuk’s robustness hypothesis of solitons, we numerically observe ...
  • Obtención de datos e imágenes ers-1 mediante simulación. Aplicaciones a interferometría 

    Carrasco, D.; Rosich, B.; Alonso, J.; Broquetas Ibars, Antoni (1995-06)
    Article
    Accés obert
    La simulación de imágenes SAR nos permite comprender algunas características de los sistemas SAR y comprobar la calidad de los algoritmos de procesado de imágenes SAR. En este artículo se presenta un simulador de señales ...
  • Region-based video coding using mathematical morphology 

    Salembier Clairon, Philippe Jean; Torres Urgell, Lluís; Meyer, F; Gu, C (1995-06)
    Article
    Accés obert
    This paper presents a region-based coding algorithm for video sequences. The coding approach involves a time-recursive segmentation relying on the pixels homogeneity, a region-based motion estimation, and motion compensated ...
  • Image restoracion using the w-slice method 

    Sayrol Clols, Elisa; Chrysostomos, Nikias; Gasull Llampallas, Antoni (1995-08)
    Article
    Accés obert
    We propose the use of higher order statistics (HOS)-based methods to address the problem of image restoration. The restoration strategy is based on the fact that the phase information of the original image and its HOS are ...
  • Hybrid waves guided by ultrathin films 

    Torner Sabata, Lluís; Pérez Torres, Juan; Ojeda, C.; Mihalache, Dumitru (1995-09)
    Article
    Accés obert
    Abstract: The existence conditions and waveguiding properties of new hybrid, TE-dominant waveguide modes of properly tailored waveguides consisting on ultrathin films cladded by a positive birefringent crystal are analyzed. ...
  • Database of "in vivo" measurements for quantitative microwave imaging and reconstruction algorithms available 

    Mallorquí Franquet, Jordi Joan; Joachimowicz, N; Bolomey, Jean Charles; Broquetas Ibars, Antoni (1995-10)
    Article
    Accés obert
  • Observation of mutual trapping and dragging of two-dimensional spatial solitary waves in a quadratic medium 

    Torruellas, William; Wang, Zou; Torner Sabata, Lluís; Stegeman, George (1995-09)
    Article
    Accés restringit per política de l'editorial
    We report experimental evidence for trapping of two-dimensional (2 + 1) spatial solitary waves in a KTP crystal resulting from its second-order nonlinearity. In addition, dragging of the solitary beams is observed as a ...

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