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Ara es mostren els items 185-204 de 223

    • Scanner de microondas. Una alternativa a la radiación ionizante 

      Reyes, E De Los; Jofre Roca, Lluís; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Cardama Aznar, Ángel; Broquetas Ibars, Antoni; Rius Casals, Juan Manuel; Ibañez, J; Ripollés, O (1987)
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      La utilización de radiación de microondas para la obtención de imágenes tomográficas de cuerpos biológicos es un nuevo campo de investigación que puede englobarse dentro de los métodos de diagnóstico no invasivo. El elemento ...

    • Sección recta de blancos radar complejos en tiempo real 

      Rius Casals, Juan Manuel (Universitat Politècnica de Catalunya, 1991-07-08)
      Tesi
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      Este trabajo resuelve el problema de gran interés para la industria aeronáutica: el cálculo de la sección recta (RCS) de blancos radar complejos en tiempo real. Para ello basta una estación de trabajo con un acelerador ...

    • Sección recta de blancos radar complejos en tiempo real: aproximación de óptica física 

      Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena; Ferrando Bataller, Miquel (Unión Científica Internacional de Radio (URSI), 1990)
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    • Sensitivity study of the microwave spiralimetric imaging 

      Jofre Roca, Lluís; Blanch Boris, Sebastián; Cardama Aznar, Ángel; Rius Casals, Juan Manuel; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2005)
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      The use of the spiral modes-electromagnetically related to the orbital momentum of the photons- at microwave frequencies for imaging purposes is studied and some preliminary numerical and experimental results for basic ...

    • Shaped reflector antenna analysis by graphical processing methods 

      Rius Casals, Juan Manuel; Vall-Llossera Ferran, Mercedes Magdalena; Salazar, C; Cardama Aznar, Ángel (1999-07)
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    • Simple randomized strategies for low-rank matrix compression 

      López Menchón, Héctor; Molina Burgués, Robert; Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (Universidad de Sevilla, 2023)
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      We propose a randomized Pseudo Skeleton (or CUR) approximation method to compress the H-matrices of linear systems that arise in the discretization of integral equations in electromagnetic scattering. This method is ...

    • Simulation of shipborne small HF antennas with RWG discretization and fast solver 

      Rius Casals, Juan Manuel; Jofre Roca, Lluís; Tamayo Palau, José María; Heldring, Alexander; Úbeda Farré, Eduard (2010)
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      In this paper, an alternative approach has been used to analyze an electrically small antenna (1.2m in the 2-30 MHz band) in a large ship (238m length) using a generic EFIE simulation code with Rao, Wilton and Glisson (RWG) ...

    • Simultaneously improving the efficiency and compression of the adaptive cross approximation algorithm 

      Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Comunicació de congrés
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      This paper proposes an adaptation of the conventional ACA algorithm for block-wise impedance matrix compression, yielding a substantial speed-up as well as a higher compression rate. The recently published stochastic ...

    • Sistema cilíndrico para tomografía rápida de microondas 

      Jofre Roca, Lluís; de los Reyes, Elías; Elias Fusté, Antoni; Ferrando Bataller, Miquel; Romeu Robert, Jordi; Baquero, M; Rius Casals, Juan Manuel (Unión Científica Internacional de Radio (URSI), 1986)
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    • Solving electromagnetic scattering in dielectric bodies by Monte Carlo sampling 

      López Menchón, Héctor; Rius Casals, Juan Manuel; Úbeda Farré, Eduard; Heldring, Alexander (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      In this work, we propose Monte Carlo sampling as a technique to avoid communication overhead in the numerical solution of complex electromagnetic scattering problems. The method is based on statistically sampling a ...

    • Sparsified ACA for accelerated iterative solution of the MoM linear system 

      Heldring, Alexander; Rius Casals, Juan Manuel; Úbeda Farré, Eduard; Tamayo Palau, José María (2011)
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      A new algorithm, the Sparsified Adaptive Cross Approximation (SPACA) is presented for fast iterative solution of the Method of Moments linear system. Like ordinary ACA, it is a completely kernel-independent method, but ...

    • Sparsified adaptive cross approximation algorithm for accelerated method of moments computations 

      Heldring, Alexander; Tamayo Palau, José María; Simon, C.; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2012-08)
      Article
      Accés restringit per política de l'editorial
      This paper presents a modification of the adaptive cross approximation (ACA) algorithm for accelerated solution of the Method of Moments linear system for electrically large radiation and scattering problems. As with ACA, ...

    • Spectral iterative algorithm for RCS computation in electrically large or intermediate perfectly conducting cavities 

      Rius Casals, Juan Manuel; Lozano Solsona, Angel; Cardama Aznar, Ángel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1994-06-01)
      Article
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      A novel algorithm designed to compute efficiently and accurately the high-frequency electromagnetic scattering from open-ended waveguide cavities is presented. The cavity is converted into a stepped-waveguide model so that ...

    • Stable discretization of the electric-magnetic field integral equation with the taylor-orthogonal basis functions 

      Úbeda Farré, Eduard; Tamayo Palau, José María; Rius Casals, Juan Manuel; Heldring, Alexander (2013-03)
      Article
      Accés restringit per política de l'editorial
      We present two new facet-oriented discretizations in method of moments (MoM) of the electric-magnetic field integral equation (EMFIE) with the recently proposed Taylor-orthogonal (TO) and divergence-Taylor-orthogonal ...

    • Stochastic estimation of the Frobenius norm in the ACA convergence criterion 

      Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2015-03-01)
      Article
      Accés obert
      The adaptive cross approximation (ACA) algorithm has been used in many fast Integral Equation solvers for electromagnetic Radiation and Scattering problems. It efficiently computes a low rank approximation to the interaction ...

    • Subsistemas de radiofrecuencia para tomografía de microondas 

      de los Reyes, Elías; Jofre Roca, Lluís; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Baquero, M; Romeu Robert, Jordi; Rius Casals, Juan Manuel (Unión Científica Internacional de Radio (URSI), 1986)
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    • Tangential-normal line testing for a nonconforming discretization of the Transversal-Electric Electric-Field Integral Equation for 2D conductors 

      Sekulic, Ivan; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      The Method-of-Moment (MoM) discretization of the Electric-Field Integral Equation (EFIE) for a transversal electric (TE) illuminating plane wave impinging on an infinitely long cylinder (2D-object) traditionally ...

    • Tangential-normal surface testing for the nonconforming discretization of the electric-field integral equation 

      Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (2016-01-12)
      Article
      Accés obert
      Nonconforming implementations of the electric-field integral equation (EFIE), based on the facet-oriented monopolar-RWG set, impose no continuity constraints in the expansion of the current between adjacent facets. These ...

    • Taylor-orthogonal basis functions for the discretization in method of moments of second kind integral equations in the scattering analysis of perfectly conducting or dielectric objects 

      Úbeda Farré, Eduard; Tamayo Palau, José María; Rius Casals, Juan Manuel (2011)
      Article
      Accés obert
      We present new implementations in Method of Moments of two types of second kind integral equations: (i) the recently proposed Electric-Magnetic Field Integral Equation (EMFIE), for perfectly conducting objects, and (ii) ...

    • Temperature and permittivity measurements using a cylindrical microwave imaging system 

      Broquetas Ibars, Antoni; Ferrando Bataller, Miquel; Rius Casals, Juan Manuel; Jofre Roca, Lluís; de los Reyes, Elías; Cardama Aznar, Ángel; Elias Fusté, Antoni; Ibáñez, Juan (Institute of Electrical and Electronics Engineers (IEEE), 1987)
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