Waveguide Model for Thick Complementary Split Ring Resonators

This paper presents a very simple analytical model for the design of Frequency Selective Surfaces based on Complementary Split Ring Resonators (CSRR) within the microwave range. Simple expressions are provided for the most important geometrical parameters of the model, yielding an accurate description of the CSRR resonance frequency and avoiding full-wave numerical simulations. Besides, a qualitative description of the band-pass filter behavior of these structures is described, considering its high quality factor Q.Comment: Paper accepted at the 2014 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. paper submission #286

Peculiaridades de la investigación científca en áreas experimentales y no experimentales. Repercusiones en los modelos de evaluación

The relative importance of inputs and outputs from the point of view of the researchers is shown. Differences detected between areas are also described. A quality assessment of journals in seven scientific fields (Law, Economics, Art & History, Social Sciences, Philology, Philosophy, Educational Sciences and Psychology) is described. The system developed has been used in several institutional assessment of R&D activities.Se muestra la importancia que los científicos de los distintos campos asignan a distintos recursos científicos (Proyectos de investigación, convenios y becas) y resultados científicos (artículos científicos, libros, capítulos de libros, informes, contribuciones a congresos y tesis doctorales) y las diferencias detectadas en función del área científica a la que pertenecen. Se exponen los principales resultados de un estudio sobre la calidad de revistas científicas en las áreas de Ciencias Humanas y Sociales. Los listados de revistas resultantes han sido utilizados en diversas evaluaciones de la investigación en Andalucía e integrados en varios baremos de contratación de Universidades

Study of the Business Model of three Earth Observation (EO) companies already present in the Very Low Earth Orbit market (VLEO)

The emergence of a new private spaceflight industry has taken the Earth Observation (EO) sector by surprise. NewSpace companies are challenging the traditional satellite sector by addressing their services to mass market requirements of high-quality and low-cost EO. As part of the DISCOVERER project, this study aims to determine the Key Success Factors to consider by a new EO company at Low Earth Orbit (LEO). Hence, three businesses fitting the description were analyzed with the Case Study Methodology to establish their Business Model Canvas (BMC), associated Patterns, and Key Success Factors. The investigation consolidated the newly proposed Democratizing Business Model Pattern and added new characteristics. Successful EO NewSpace firms are getting divided between integrated operators, integrated manufacturers, and end-user specialists. A new EO company should consider the Democratizing Pattern success factors and the Vertically Integrated Strategies (VIS), depending on its disruptive idea and resource capabilities. Further research is needed to identify new factors, strengthen the validity of the Pattern, and VIS tendencies

Droplets of trapped quantum dipolar bosons

Strongly interacting systems of dipolar bosons in three dimensions confined by harmonic traps are analyzed using the exact path integral ground-state Monte Carlo method. By adding a repulsive two-body potential, we find a narrow window of interaction parameters leading to stable ground-state configurations of droplets in a crystalline arrangement. We find that this effect is entirely due to the interaction present in the Hamiltonian without resorting to additional stabilizing mechanisms or specific three-body forces. We analyze the number of droplets formed in terms of the Hamiltonian parameters, relate them to the corresponding s-wave scattering length, and discuss a simple scaling model for the density profiles. Our results are in qualitative agreement with recent experiments showing a quantum Rosensweig instability in trapped Dy atoms.Peer ReviewedPostprint (published version

On the resonances and polarizabilities of split ring resonators

In this paper, the behavior at resonance of split ring resonators SRRs and other related topologies, such as the nonbianisotropic SRR and the broadside-coupled SRR, are studied. It is shown that these structures exhibit a fundamental resonant mode the quasistatic resonance and other higher-order modes which are related to dynamic processes. The excitation of these modes by means of a properly polarized time varying magnetic and/or electric fields is discussed on the basis of resonator symmetries. To verify the electromagnetic properties of these resonators, simulations based on resonance excitation by nonuniform and uniform external fields have been performed. Inspection of the currents at resonances, inferred from particle symmetries and full-wave electromagnetic simulations, allows us to predict the first-order dipolar moments induced at the different resonators and to develop a classification of the resonances based on this concept. The experimental data, obtained in SRR-loaded waveguides, are in agreement with the theory and point out the rich phenomenology associated with these planar resonant structures.MEC (España)-TEC2004-04249-C02-01 y TEC2004-04249-C02-02Comunidad Europea (programa Eureka)-2895 TELEMACAgencia de Subvenciones de la República Checa-102/03/044

Addressing the 5G cell switch-off problem with a multi-objective cellular genetic algorithm

© 20xx IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The power consumption foreseen for 5G networks is expected to be substantially greater than that of 4G systems, mainly because of the ultra-dense deployments required to meet the upcoming traffic demands. This paper deals with a multi- objective formulation of the Cell Switch-Off (CSO) problem, a well-known and effective approach to save energy in such dense scenarios, which is addressed with an accurate, yet rather unknown multi-objective metaheuristic called MOCell (multi- objective cellular genetic algorithm). It has been evaluated over a different set of networks of increasing densification levels. The results have shown that MOCell is able to reach major energy savings when compared to a widely used multi-objective algorithm.TIN2016-75097-P Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

La espeleología en el centro escolar, una propuesta en el área de la Educación Física

Focused on the area of Physical Education, this article discusses a Teaching Unit proposal about caving to be carried out in the school; different examples of activities are commented and adapted from the natural environment to the educational context. With this proposal, students will have the opportunity to practice this sport in their own centre. Promotion of their personal development, involving physical, cognitive, behavioural aspects and awareness of environment’ respect and care values are also in mind. In this sense, the main purpose of this paper is to offer teachers a resource for doing caving within the different PE contents blocks, both for primary and secondary education.Enfocado al área de la Educación Física, este artículo muestra una propuesta de Unidad Didáctica centrada en el deporte de espeleología para llevarse a cabo en el propio centro escolar; en ella se exponen diferentes ejemplos de actividades, adaptadas del entorno natural al contexto educativo. Con esta propuesta, los alumnos tendrán la oportunidad de experimentar este deporte en su propio centro; se busca, además, fomentar su desarrollo personal en aspectos físicos, cognitivos y conductuales, lo que incluye el desarrollo de la toma de conciencia en torno a los valores de respeto y cuidado del medio ambiente. En este sentido, el objetivo de este trabajo es ofrecer a los docentes un recurso más para trabajar el deporte de la espeleología dentro de los diferentes bloques de contenido, tanto en la educación primaria como en la secundaria