La ciudad en Ovidio

La elegía liminar de Tristia I está dirigida por Ovidio al libro que ha escrito en el exilio y que ha de ser necesariamente su emisario en Roma, porque a él, el poeta, la Vrbs le está prohibida. A partir de allí, inicia un viaje incesante a Roma. Un viaje imaginario que durará tanto como su exilio. Esto es decir -aunque el poeta no lo sabe- tanto como el tiempo que le resta vivir. Relacionando las imágenes ilusorias de las obras del exilio con las imágenes reales de las obras del amor, cuando el poeta vivía feliz en Roma, vamos a observar el sentimiento ovidiano en uno y otro caso, para aproximarnos después a su concepción de civilización y ciudad y a una eventual evolución de la misma. [Extraído del texto a modo de resumen]Facultad de Humanidades y Ciencias de la Educació

Extending the cascading by pairs of multiport generalised scattering matrices for characterizing the connected ports

An extension to the traditional technique for cascading generalized scattering matrices (GSMs) by pairs is presented. It can solve the connection of an arbitrary number of networks, with an arbitrary number of ports, while being quite intuitive and easy to implement. It is able to compute, not only the response at the free ports of the global network -like the traditional cascading-by-pairs does- but also the connected ports, obtaining an extended GSM (eGSM), which can be used to find the field inside the full network for an arbitrary incidence.Díaz Caballero, E.; Belenguer, A.; Esteban González, H.; Boria Esbert, VE. (2014). Extending the cascading by pairs of multiport generalised scattering matrices for characterizing the connected ports. IEEE Microwave and Wireless Components Letters. 24(11):733-735. doi:10.1109/LMWC.2014.2348181S733735241

Automatic, Calibrated and Accurate Measurement of S-Parameters in Climatic Chamber

When measuring RF or microwave devices under a temperature profile inside a climatic chamber, one of the main problems lies in the impossibility to have the network analyzer calibrated for all the temperatures measured along the profile. Typically, the calibration is performed just at room temperature, assuming that there is going to be an error in the rest of the measured temperatures. That error will be higher the further we are from room conditions. In this work, we present a systematic procedure for accurately measuring the S-parameters of a device at different temperatures. It applies a calibration algorithm using the S-parameters of the device under test (DUT) and of the calibration standards measured at the different temperatures of interest along the temperature profile.This work was supported by the European High RF Power Space Laboratory of Val Space Consortium for contributing with its installations - Laboratory co-funded by the European Regional Development Fund-A way of making Europe.Monerris Belda, Ó.; Díaz Caballero, E.; Ruiz Garnica, J.; Boria Esbert, VE. (2015). Automatic, Calibrated and Accurate Measurement of S-Parameters in Climatic Chamber. IEEE Microwave and Wireless Components Letters. 25(6):412-414. doi:10.1109/LMWC.2015.2421330S41241425

La Hermenéutica Analógica aplicada a la Didáctica: Algunas consideraciones preliminares

La intención de este artículo es la de establecer las bases de la ciencia didáctica. Esta perspectiva parte de la concepción de la didáctica como una ciencia hermenéutica. Pero no sólo eso. Didáctica es ciencia y arte. Una disciplina híbrida que necesita de esta intermediación epistémica. De aquí que la didáctica que se propone es fuertemente analógica

Krylov's solver based technique for the cascade connection of multiple n-port multimodal scattering matrices

“© 2013 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.”In this paper, a novel technique for cascading generalized scattering matrices based on a Krylov's iterative solver is presented. This new technique is fully general, since it can be applied to solve the connection of an arbitrary number of networks, each one with an arbitrary number of ports, and it is easy to implement. This technique is able to compute, not only the modal spectra at the free ports of the global network, but also the modal spectra at the connected ports, so that the field inside the full network can be computed for an arbitrary incidence. In addition, this technique can also be used to evaluate the scattering parameters of the global network.Belenguer Martínez, Á.; Díaz Caballero, E.; Esteban González, H.; Lucas Borja, A.; Cascon Lopez, J. (2013). Krylov's solver based technique for the cascade connection of multiple n-port multimodal scattering matrices. IEEE Transactions on Microwave Theory and Techniques. 61(2):720-726. doi:10.1109/TMTT.2012.2231696S72072661

Accurate and Efficient Design of Double Post Substrate Integrated Waveguide Filters Using Simulators Based on Open Space Modal Expansions

© 2012 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.An Agressive Space Mapping (ASM) strategy for efficiently and accurately designing passive filters in substrate integrated waveguide (SIW) technology is presented and successfully validated for the double post topology. Full-wave simulators based on open space modal expansions are used in both the coarse and fine models of this strategy.Díaz Caballero, E.; Morro, JV.; Esteban González, H.; Boria Esbert, VE.; Belenguer Martínez, Á. (2012). Accurate and Efficient Design of Double Post Substrate Integrated Waveguide Filters Using Simulators Based on Open Space Modal Expansions. IEEE. doi:10.1109/APS.2012.6348982

Efficient Analysis of Substrate Integrated Waveguide Devices Using Hybrid Mode Matching Between Cylindrical and Guided Modes

A new method is presented in this paper to efficiently analyze substrate integrated waveguide (SIW) based devices with multiple accessing ports. The problem is considered as a 2-D electromagnetic problem assuming no field variation normal to the dielectric substrate. The incident and scattered fields from each circular cylinder are expanded with cylindrical modes, and the fields in the waveguide ports are expanded using progressive and regressive modal summations. The addition theorems of Bessel and Hankel functions are used to analyze the full-wave behavior of the SIW device. In order to extract the circuital parameters, the hybrid mode-matching between guided and cylindrical modes is done by projecting continuity equations in a circular boundary containing the whole SIW structure over the inner modes of each region. Applying this new technique, it is possible to analyze multiple port devices by solving a set of integrals that can be easily approached analytically or by using the inverse fast Fourier transform, avoiding the use of non efficient numerical methods. It is shown that the new method runs faster than commercial software packages and other techniques recently published

Unraveling Competitive Electron and Energy-Transfer Events at the Interfaces of a 2D MOF and Nile Red Composites: Effect of the Length and Structure of the Linker

[EN] The distribution and interactions of organic molecules adsorbed on the surface of materials play important roles in many catalytic and photonic processes. Here, we show that the length and chemical structure of the linker in new Al-ITQ metal-organic frameworks (MOFs) are fundamental for the dynamics of the dye Nile Red (NR) adsorbed on its surface. For the studied composites using A1-ITQ-4-ethylbenzoic acid (EB), Al-ITQ-4-aminobenzoic acid (AB), and Al-ITQ : EB exposed to the aniline (AN) or N,N-dimethylani-line (DMA) atmospheres, we observed a very fast (similar to 1.2 ps) intramolecular charge-transfer reaction in adsorbed NR molecules. For NR@Al-ITQEB, where the linker has a shorter aliphatic chain (two carbons), the dye molecules present a homoenergy-transfer (ET) process, which is faster (similar to 90 ps) than in the previously reported NR@Al-ITQ-4-heptylbenzoic acid composite with longer aliphatic chain (seven carbons, similar to 220 ps). The more polar environment created by the Al-oxide nodes in Al-ITQ-EB surface around the NR populations strongly favors the ET event. When the linker structure contains phenyl amine moieties, the resulting NR@Al-ITQ-AB composites show different and rich photodynamics, in which a fast electron transfer reaction from the MOF aniline moiety to the adsorbed NR occurs in similar to 17 ps, inhibiting the ET process between the dye molecules near the MOF surface. This process also was confirmed in Al-ITQ-EB MOF exposed to AN and DMA gas atmospheres, as well as NR in pure aniline. The obtained results demonstrate how modifications in the length and structure of the organic linker in this MOF change the interface interactions and outcome of the photoinduced processes in the composites. Our findings on dye-MOF interface photobehavior are relevant to the design of new materials in which the interface plays a key role in their performance in the fields of catalysis and photonics.This work was supported by MINECO through projects MAT2014-57646-P, MAT2017-86532-R, and MAT2017-82288-C2-1-P. J.M.M. thanks the predoctoral fellowship from the Severo Ochoa program for support (SEV-2016-0683), and E.C.-M thanks the MINECO for the FPI fellowship (BES-2015-071495). We thank Dr. John Spencer Baskin for reading the manuscript.Caballero-Mancebo, E.; Moreno-Rodríguez, JM.; Cohen, B.; Díaz Morales, UM.; Corma Canós, A.; Douhal, A. (2018). Unraveling Competitive Electron and Energy-Transfer Events at the Interfaces of a 2D MOF and Nile Red Composites: Effect of the Length and Structure of the Linker. ACS Applied Materials & Interfaces. 10(38):32885-32894. https://doi.org/10.1021/acsami.8b12188S3288532894103

Rendimiento académico comparado del programa de enseñanzas regladas en lengua inglesa en la EUEE de la Universidad de Sevilla

En este trabajo se lleva a cabo un análisis empírico del rendimiento académico de los alumnos que realizan la Diplomatura en Ciencias Empresariales en el programa de docencia en lengua inglesa que la Escuela Universitaria de la Universidad de Sevilla lleva a cabo desde el curso académico 2003-2004. Para tal fin, se realiza un estudio estadístico descriptivo de un conjunto de parámetros de rendimiento académico de dichos alumnos obtenidos a partir de la información remitida por el Servicio de Aplicaciones Informáticas y la Secretaría de la Escuela de Estudios Empresariales de la Universidad de Sevilla

Cytochrome c speeds up caspase cascade activation by blocking 14-3-3¿-dependent Apaf-1 inhibition article

Apoptosis is a highly regulated form of programmed cell death, essential to the development and homeostasis of multicellular organisms. Cytochrome c is a central figure in the activation of the apoptotic intrinsic pathway, thereby activating the caspase cascade through its interaction with Apaf-1. Our recent studies have revealed 14-3-3€ (a direct inhibitor of Apaf-1) as a cytosolic cytochrome c target. Here we explore the cytochrome c / 14-3-3€ interaction and show the ability of cytochrome c to block 14-3-3€-mediated Apaf-1 inhibition, thereby unveiling a novel function for cytochrome c as an indirect activator of caspase-9/3. We have used calorimetry, NMR spectroscopy, site mutagenesis and computational calculations to provide an insight into the structural features of the cytochrome c / 14-3-3€ complex. Overall, these findings suggest an additional cytochrome c-mediated mechanism to modulate apoptosome formation, shedding light onto the rigorous apoptotic regulation network