MARQUÉS SILLERO , Ricardo

La memoria se divide en dos partes, una dedicada al análisis cuasiestático (no dispersivo), y otra dedicada al análisis en frecuencia (dispersivo).En el Cap&iacut ... En el Capítulo II presentamos la teoría de modos cuasiestáticos en líneas de transmisión en medios anisótropos, y se particulariza el análisis a medios no magnéticos. Como un...

En apenas cuatro años la ciudad de Sevilla ha pasado de una participación marginal de la bicicleta en el conjunto de la movilidad urbana a cotas de participación en torno al 6% del reparto modal global de la ciudad. Éste ha sido el resultado de un proceso social y de unas políticas activas de promoción de la bicicleta que se analizan a lo largo...

It is shown that, when all macroscopic currents associated with the electric and magnetic polarizability are properly accounted for, the standard expression for the Poynting vector and the average work exerted by the electric field on the electric charges provide exactly the same value for the heating rate. Therefore, there is no contradiction...

The impact of newly created infrastructures in dense cities is a key element for assessing their integration in urban contexts. In the case of the network of cycle paths of Seville, this impact has been important in many aspects, and has been analyzed from several points of view. Nevertheless, as far as we know, an analysis of its direct impact...

The alternate current (ac) internal impedance of rectangular cross-sectional conductors used as transmission lines and interconnects in microwave and digital printed circuits were analyzed. The difference between the real and imaginary parts of internal impedance to the existence of right-angle corners in the rectangular cross-sectional...

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In this contribution, the basic concepts underlying the physics of magnetoinductive MI lenses are developed and the main practical limitations to their performances are analyzed. Strategies to overcome such limitations are proposed. Possible applications of MI lenses in magnetic resonance imaging are discussed.

Dispositivo para mejorar la sensibilidad de las bobinas receptoras en imágenes médicas por resonancia magnética.La presente invención tiene por objeto un dispositivo para mejorar la sensibilidad de las bobinas de superficie que se usan en la obtención de

The perfectly conducting stacked fishnet metamaterial is studied in this paper. The analysis is based on a combination of the mode matching method together with the generalized eigenvalue problem, and takes into account wave propagation along all three Cartesian axes. The analysis has been developed for a fishnet of square lateral periodicity...

A planar near-field magnetoinductive lens operating in the microwave range is presented. Theproposed device consists of two parallel planar arrays of metallic broadside coupledsBCdsplit-ringresonatorssSRRsd, or BC-SRRs. The power coming from a point-like source located in front of thelens is focused into a receiver located in free...

Lente de campo cercano para ondas electromagnéticas.La presente invención consiste en una lente que concentra o focaliza el campo cercano generado por una fuente de ondas electromagnéticas. La focalización da lugar a una imagen de la fuente que posee una

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In this paper, a systematic approach to the design of bulk isotropic magnetic metamaterials is presented. The roles of the symmetries of both the constitutive element and the lattice are analyzed. For this purpose, it is assumed that the metamaterial is composed of cubic split ring resonators (SRRs) arranged in a cubic lattice. The minimum...

In this work, the previously reported near-field imaging by two strongly coupled arrays of planar magnetic resonators is further studied. Experiments are performed to clarify the physical mechanisms underlying such an effect. The specific aim of these experiments is to clarify both the role played by magnetoinductive surface waves MISWs and...

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Este trabajo analiza el impacto de la creación de una red continua de vías ciclistas segregadas del tráfico motorizado en la economía local y en la imagen turística de las ciudades, a través del estudio de caso de la ciudad de Sevilla, desarrollando para ello una metodología que podría ser útil en el análisis de otras experiencias similares. La...

An analytical theory of extraordinary optical transmission (EOT) through realistic metallic screens perforated by a periodic array of subwavelength holes is presented. The theory is based on our previous work on EOT through perfect conducting screens and on the surface impedance concept. The proposed theory is valid for the complete frequency...

This paper presents a quasi-TM approach for the fundamental mode of transmission lines with semiconductor substrates and nonperfect metallic conductors. The approach has allowed us to develop a transmission-line model by properly defining frequency-dependent parameters in terms of the quasi-static electric potential and the electric current...

The usefulness of thin split ring metamaterial slabs for imaging applications, including magnetic resonance imaging applications, has attracted some attention in the past years. However, the small number of unit cells across these thin slabs prevents the direct application of continuous medium models for its characterization. The main aim of...

In this work, it is demonstrated that metamaterial lenses can help to increase the signal-to-noise ratio of magnetic resonance imaging coils in low-field magnetic resonance imaging systems. In low-field magnetic resonance imaging systems, the dominant source of noise in the signal-to-noise ratio comes from the metallization of the coil and the...

This paper analyzes the guidance of magnetostatic surface waves (MSSW) by a metallic strip printed on a ferrimagnetic slab or on a dielectric/ferrimagnetic structure (suspended configuration) in the frame of the magnetostatic approach. An integral spectral domain analysis (SDA) is used for this purpose. Shielding upper and/or lower ground...

This letter demonstrates the near-field imaging enhancement at microwave frequencies of two-dimensional sources by a ferrite slab magnetized to saturation. It is shown that this effect is based on the nonreciprocal amplification of magnetostatic surface waves (MSSW) across the ferrite slab. The inclusion of losses in our analysis has also made...

Extraordinary optical transmission of light or electromagnetic waves through metal plates periodically perforated with subwavelength holes has been exhaustively analyzed in the last ten years. The study of this phenomenon has attracted the attention of many scientists working in the fields of optics and condensed matter physics. This confluence...