Leaky-Wave antennas with arbitrary radiation based on bianisotropic Huygens’ metasurfaces

In this contribution, we present the application of Huygens’ metasurfaces (HMS) to the arbitrary design of leaky-wave antennas (LWAs). These metasurfaces have demonstrated their capabiity to tailor the electromagnetic waves at will. We use them to design LWAs consisting on a parallel-plate waveguide in which the top cover is replaced by a HMS, which implements the desired field transformation. By introducing bianisotropy of the omega type into the metasurface, we have the required degrees of freedom to achieve arbitrary control of the LWA radiation parameters: leakage factor and pointing angle (phase constant). The theoretical derivation of the concept and the design methodology will be described. Moreover, the flexibility in the design will be highlighted with results of two examples of broadside radiation with different directivities.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 706334

Televisión abierta y niños: una reflexión desde su consumo.

La televisión es uno de los medios que hemos incluido por completo en nuestra vida cotidiana y a pesar de que actualmente compite con nuevos medios, como el internet, sigue siendo de gran importancia en la vida de los sujetos, especialmente en sociedades como la nuestra, donde es uno de los medios con mayor preferencia y que se encuentra al alcance de todo público. Actualmente el concepto que se tiene de la televisión no es el mejor, ya que estudiosos argumentan que este medio es muy peligroso y nocivo, especialmente para el público infantil. Sin embargo, no podemos dejar de lado que este medio es parte de nuestra vida, en especial en la vida de la sociedad mexicana, y aunque existan académicos que reflexionen acerca de sus contenidos y argumenten que hay actividades con mayor beneficio que la televisión, también existe una población que invita a la televisión a participar dentro de la convivencia diaria en el hogar, y no está muy dispuesta a cerrarle la puerta. ¿Qué hacer cuando un medio como la televisión es tan importante en la vida de la sociedad? En nuestro país se escuchan muchos comentarios acerca de que somos una sociedad que está muy influenciada por la televisión y que es el perfecto ejemplo de circo cuando se usa la frase “al pueblo, pan y circo”

Application of Huygens’ Metasurfaces to the Arbitrary Design of a Leaky-Wave Antenna

Leaky-wave antennas are guiding structures that leak power along their length. Their radiation is mainly characterized by the propagation constant (leakage factor and phase constant) of the traveling wave. In this contribution, a leakywave antenna based on parallel-plate waveguide is proposed. Arbitrary control of the leakage factor and the phase constant is achieved by replacing the top plate by an omega-type bianisotropic Huygens’ metasurface, which implements the desired field transformation. The theoretical derivation and design methodology are briefly described. Several designs with different pointing angles (phase constants) and leakage rates have been carried out. Electromagnetic simulation results validate the theoretical derivation, highlight the capabilities of the structure and confirm the flexibility in the design parameters.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Influencia de la práctica de actividad físico-deportiva en la autoestima en mujeres

El objetivo de este trabajo es analizar la autoestima en mujeres y examinar las diferencias en autoestima según la práctica de actividades físico-deportivas. Para la realización de este estudio se empleó el SEI (Self-Esteem Inventory, Rector y Roger, 1993), una escala de 58 ítems diseñada para evaluar la autoestima global. La muestra está formada por 60 mujeres de la población sevillana, de edades comprendidas entre los 18 y los 60 años. Este estudio constituye un análisis específico de una población concreta, aportando resultados que contribuirán a conocer la posibilidad de incrementar los niveles de autoestima utilizando la práctica física como medio

Light-induced effects on Spiro-OMeTAD films and hybrid lead halide perovskite solar cells

Perovskite (PS) solar cells have emerged as a promising technology for low-cost and efficient photovoltaics. However, the main limiting factors are related to their low long-term stability. The loss of performance of these devices is commonly attributed to degradation of the PS itself. In order to further explore the origins of such limited stability, we have developed UV–vis spectroscopy studies that clearly demonstrate that PS layers remain unalterable under the working conditions. On the contrary, significant variations in the absorption spectra of the Spiro-OMeTAD layer (Spiro), a commonly used hole transporting material (HTM), indicate that the loss of performance over the irradiation time are attributed to the degradation of Spiro. UV–vis measurements evidence a photo-induced oxidation of Spiro, both under air and inert atmosphere. This photo-oxidation is accelerated by the commonly employed additives of the Spiro (LiTFSI and tBP), as well as by the interfacial contact with the electron injecting layer (TiO2). Therefore, our results point to the Spiro degradation as the main mechanism that induces the limited functioning of the PS solar cells. Consequently, focusing on the development of alternative HTMs stable under the working conditions is one of the critical issues to be overcome for a suitable progress of PS solar cells and related opto-electronic devices

Software Design Guidelines for Usability

For years, the Human Computer Interaction (HCI) community has crafted usability guidelines that clearly define what
characteristics a software system should have in order to be easy to use. However, in the Software Engineering (SE)
community keep falling short of successfully incorporating these recommendations into software projects. From a SE
perspective, the process of incorporating usability features into software is not always straightforward, as a large number
of these features have heavy implications in the underlying software architecture. For example, successfully including an
“undo” feature in an application requires the design and implementation of many complex interrelated data structures and
functionalities. Our work is focused upon providing developers with a set of software design patterns to assist them in the
process of designing more usable software. This would contribute to the proper inclusion of specific usability features
with high impact on the software design. Preliminary validation data show that usage of the guidelines also has positive
effects on development time and overall software design quality

A first approach to an axiomatic model of multi-measures

We establish an axiomatic model of multi-measures, capturing some classes of measures studied in the fuzzy sets literature, where they are applied to only one or two arguments

A Broadband Bow-Tie Cavity-Backed Slot for Traveling-Wave Arrays in the Millimeter-Wave Band

The use of bow-tie geometries to enhance the characteristics of a radiating element previously proposed by the authors is presented. The previous element consisted of a broadband cavity-backed slot in transmission configuration. The bow-tie shape of the cavity improves the bandwidth of the element and the bow-tie slot keeps constant the amount of power radiated. The structure is designed for the millimeterwave band. The enhancement of the element performance is shown through simulation results. A fractional bandwidth of more than 100% is achieved in the 70 GHz band, and the radiated power remains almost constant throughout 30 GHz of the bandwidth. These results show a great improvement over the original radiating element. The radiating structure has the ideal characteristics for building series-fed reconfigurable arrays for wide-band applications in the millimeter-wave band.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. This work was supported in part by the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 706334, in part by the Spanish Ministerio de Educaci´on, Cultura y Deporte (Programa para la Formaci´on del Profesorado Universitario) under Grant FPU15/06457 and in other part by the Spanish Ministerio de Econom´ıa y Competitividad, under the project ADDMATE TEC2016-76070-CR3-3-R