Un proyecto de innovación docente e iniciación a la investigación en Arqueología e Historia Antigua: la Universidad de Sevilla en la villa del casale (Sicilia)

En este artículo se presenta un proyecto de innovación docente e introducción a la investigación desarrollado en la Universidad de Sevilla en las áreas de Arqueología e Historia Antigua. El proyecto se lleva realizando desde hace cuatro cursos académicos y su objetivo principal es acercar a los estudiantes de Historia a las destrezas y contenidos propios de la investigación en la Antigüedad clásica y la práctica arqueológica. Se emplea para conseguir este fin el caso concreto de la villa tardoantigua de Piazza Armerina en Sicilia. En el presente artículo se plantean los objetivos principales del proyecto, su metodología y seguimiento, así como los resultados obtenidos hasta el momentoIn this paper, a project is presented on innovative teaching and introduction to research carried out in the University of Seville in the fields of Archaeology and Ancient History. The project has been put into effect over the last four academic years and its main aim is to familiarise History undergraduates with the skills and contents of Archaeology and Ancient History as academic disciplines. To this end, the specific case of the Late-Roman Villa of Piazza Armerina in Sicily is studied. The present paper assesses the principal objectives of the project, its methodology, as well as the results obtained so far

Influence of the different processing steps on the microstructure of PZT-based multilayer

[ES] Se ha realizado un estudio comparativo de la influencia de los parámetros reológicos y de procesamiento sobre la microestructura y consistencia de chips multicapa de PZT obtenidos mediante un proceso de colado en cinta. Para ello se han realizado medidas de viscosidad de distintas barbotinas con diferente contenido en sólidos y su relación con el espesor y densidad en verde de las cintas obtenidas, se han identificado los puntos críticos del ciclo de quemado-sinterización y, mediante MEB se ha estudiado la microestructura en verde de las láminas coladas y la microestructura final de los chips multicapa fabricados.[EN] A comparative study of the influence of both rheological and processing parameters on the microstructure and reliability of multilayer ceramic chips based on PZT has been conducted. The multilayer chips were obtained by tape casting. Viscosity measurements of different slurries with various solids content have been correlated with both the thickness and the green density of the casted layers. The critical points of the thermal treatments, organics burn-out and sintering, have been identified. The green microstructure of the layers and the final microstructure of the sintered chips have been studied by SEM.Los autores quieren agradecer al CSIC y al Proyecto EUREKA 2309 FACTORY-PAMIS su apoyo en la realización de este trabajo.Peer reviewe

Ordered three-dimensional interconnected nanoarchitectures in anodic porous ​alumina

Three-dimensional (3D) nanostructures combine properties of nanoscale materials with the advantages of being macro-sized pieces when the time comes to manipulate, measure their properties or make a device. However, the amount of compounds with the ability to self-organize in ordered 3D nanostructures is limited. Therefore, template-based fabrication strategies become the key approach towards 3D nanostructures. Here we report the simple fabrication of a template based on anodic ¿aluminium oxide, having a well-defined, ordered, tunable, homogeneous 3D nanotubular network in the sub 100-nm range. The 3D templates are then employed to achieve 3D, ordered nanowire networks in ¿Bi2Te3 and polystyrene. Finally, we demonstrate the photonic crystal behaviour of both the template and the polystyrene 3D nanostructure. Our approach may establish the foundations for future high-throughput, cheap, photonic materials and devices made of simple commodity plastics, metals and semiconductors.We would like to acknowledge financial support from ERC 2008 Starting Grant ‘Nano-TEC’ number 240497.Peer Reviewe

A FPGA Spike-Based Robot Controlled with Neuro-inspired VITE

This paper presents a spike-based control system applied to a fixed robotic platform. Our aim is to take a step forward to a future complete spikes processing architecture, from vision to direct motor actuation. This paper covers the processing and actuation layer over an anthropomorphic robot. In this way, the processing layer uses the neuro-inspired VITE algorithm, for reaching a target, based on PFM taking advantage of spike system information: its frequency. Thus, all the blocks of the system are based on spikes. Each layer is implemented within a FPGA board and spikes communication is codified under the AER protocol. The results show an accurate behavior of the robotic platform with 6-bit resolution for a 130º range per joint, and an automatic speed control of the algorithm. Up to 96 motor controllers could be integrated in the same FPGA, allowing the positioning and object grasping by more complex anthropomorphic robots.Ministerio de Ciencia e Innovación TEC2009-10639-C04-02Ministerio de Economía y Competitividad TEC2012-37868-C04-0

Effect of the Synthesis Route on the Microstructure and the Dielectric Behavior of CaCu3Ti4O12 Ceramics

CaCu3Ti4O12 (CCTO) was prepared by a conventional synthesis (CS) and through reaction sintering, in which synthesis and sintering of the material take place in one single step. The microstructure and the dielectric properties of CCTO have been studied by XRD, FE-SEM, EDS, AFM, and impedance spectroscopy to correlate structure, microstructure, and electrical properties. Samples prepared by reactive sintering show very similar dielectric behavior to those prepared by CS. Therefore, it is possible to prepare CCTO by means of a single-step processing method

Tendencias en las tasas de hospitalización por ictus en Extremadura en el periodo 2002-2014. Cambiando la idea de ictus como una enfermedad propia de la senectud

PLANTEAMIENTO: La incidencia del ictus en nuestro medio ha sido evaluada en diferentes estudios con amplia variabilidad y no comparables. Tampoco hay estudios que analicen los cambios epidemiológicos en pacientes más jóvenes. MÉTODO: Estudio retrospectivo observacional. Conjunto Mínimo Básico de Datos. Se seleccionó a todos los pacientes mayores de 19 años hospitalizados por ictus (códigos ICD-9-CM 434.01, 434.11, 434.91, 430, 431, 432.9, 436 y 435) en el periodo 2002-2013. Análisis mediante el método de regresión lineal segmentada. RESULTADOS: Un total de 39.321 casos fueron identificados. El 47,25% mujeres. Un 3,73% tenía entre 20-44 años, el 6,29% entre 45-54, el 11,49% entre 55-64, el 23,89% entre 65-74 y un 54,60% más de 74 años. Se demuestra un incremento significativo en la tasa de hospitalización por ictus isquémico en varones de 45-54 años, +6,7% (IC del 95%: 3,3-10,2) y en mujeres de 20-44 y 45-54 años, +6,1% (IC del 95%: 0,8-11,7) y +5.7% (IC del 95%: 3,0-8,4), respectivamente. También se observa un incremento significativo de la tasa de hospitalización de ictus isquémico en varones mayores de 74 años, +4,2% (IC del 95%: 1,3-7,2). El análisis para los ataques isquémicos transitorios reproduce lo que ocurre en el ictus isquémico. El mismo análisis para el caso de la hemorragia confirma una estabilización en las tasas de hospitalización en el tiempo. CONCLUSIONES: Este estudio demuestra de una forma indirecta los cambios epidemiológicos que se están produciendo en el ictus. Existe suficiente evidencia que indica un cambio epidemiológico al aumentar la tasa de hospitalizaciones en adultos jóvenes.BACKGROUND: The incidence of stroke in Spain has been evaluated in several studies, whose results are highly variable and not comparable. No studies of stroke have analysed epidemiological changes in younger patients. METHOD: We conducted a retrospective observational study using the Spanish health system’s Minimum Data Set and included all patients older than 19 hospitalised due to stroke (ICD-9-CM codes 434.01, 434.11, 434.91, 430, 431, 432.9, 436, and 435) between 2002 and 2013. The analysis was performed using joinpoint regression. RESULTS: A total of 39 321 patients were identified (47.25% were women); 3.73% were aged 20-44, 6.29% were 45-54, 11.49% were 55-64, 23.89% were 65-74, and 54.60% were >74 years. The hospitalisation rate due to ischaemic stroke has increased significantly in men aged 45-54 (+6.7%; 95% CI, 3.3-10.2) and in women aged 20-44 and 45-54 (+6.1%; 95% CI, 0.8-11.7 and +5.7%; 95% CI, 3.0-8.4, respectively). We also observed a significant increase in the rate of hospitalisation due to ischaemic stroke in men aged over 74 (+4.2%; 95% CI, 1.3-7.2). The rate of hospitalisations due to transient ischaemic attack has also increased significantly whereas the rate of hospitalisations due to brain haemorrhage has stabilised over time. CONCLUSIONS: Our results provide indirect evidence that the epidemiological profile of stroke is changing based on the increase in hospitalisation rates in young adults.• Sistema Extremeño de Salud. Beca de intensificación investigadorapeerReviewe

A new sensor-based self-configurable bandstop filter for reducing the energy leakage in industrial microwave ovens

In this work a new sensor-based self-configurable waveguide bandstop filter that uses a combination of metallic irises and reconfigurable posts for reducing the energy leakage in industrial microwave ovens is presented and validated through a procedure fully based on measurements. Several optimization and reconfiguration alternatives of the moving posts such as genetic algorithms and parametric sweeps are assessed. Results show that good attenuation values can be obtained for all the analyzed scenarios. In particular, genetic algorithms are shown as the best search strategy. Design and optimization times are also reduced when using the proposed filter compared to computer simulations

Electromagnetic equivalent models for printed circuit boards inside a metallic enclosure Using a coaxial-to-waveguide transition calibration

Equivalent models of printed circuit boards are useful to simplify electromagnetic problems by reducing the computational costs of numerical simulations. In this paper, a new procedure for obtaining a simple equivalent model of printed circuit boards inside metallic enclosures is presented. The equivalent model is obtained in two steps: first we precisely characterize the coaxial to waveguide transitions used during measurements by means of an inverse procedure and then during a second inverse procedure, we carry out simulations by concatenating these transitions and the equivalent model and comparing to measurements. The optimized parameters for the equivalent model are: thickness, dielectric constant and the electric conductivity. Results for a printed circuit board in three scenarios have been obtained by using a sweep and two different optimization techniques. Benefits and drawbacks of the model are discussed. Results indicate that this procedure produces very precise characterization of the equivalent model of PCBs depending on the position and orientation of this device within the enclosure.This work was supported in part by the Fundación Séneca, Agencia de Ciencia y Tecnología de la Región de Murcia, under the Séneca predoctoral fellowship with reference 16381/FPI/10 and under the project 00700/PPC/0

Towards AER VITE: building spike gate signal

Neuromorphic engineers aim to mimic the precise and efficient mechanisms of the nervous system to process information using spikes from sensors to actuators. There are many available works that sense and process information in a spike-based way. But there are still several gaps in the actuation and motor control field in a spike-based way. Spike-based Proportional-Integrative-Derivative controllers (PID) are present in the literature. On the other hand, neuro-inspired control models as VITE (Vector Integration To End point) and FLETE (Factorization of muscle Length and muscle Tension) are also present in the literature. This paper presents another step toward the spike implementation of those neuro-inspired models. We present a spike-based ramp multiplier. VITE algorithm generates the way to achieve a final position targeted by a mobile robotic arm. The block presented is used as a gate for the way involved and it also puts the incoming movement on speed with a variable slope profile. Only spikes for information representation were used and the process is in real time. The software simulation based on Simulink and Xilinx System Generator shows the accurate adjust to the traditional processing for short time periods and the hardware tests confirm and extend the previous simulated results for any time. We have implemented the spikes generator, the ramp multiplier and the low pass filter into the Virtex-5 FPGA and connected this with an USB-AER (Address Event Representation) board to monitor the spikes.Ministerio de Ciencia e Innovación TEC2009-10639-C04-0

Using Genetic Algorithms to Improve Support Vector Regression in the Analysis of Atomic Spectra of Lubricant Oils

[Abstract] Purpose – The purpose of this paper is to assess the quality of commercial lubricant oils. A spectroscopic method was used in combination with multivariate regression techniques (ordinary multivariate multiple regression, principal components analysis, partial least squares, and support vector regression (SVR)). Design/methodology/approach – The rationale behind the use of SVR was the fuzzy characteristics of the signal and its inherent ability to find nonlinear, global solutions in highly complex dimensional input spaces. Thus, SVR allows extracting useful information from calibration samples that makes it possible to characterize physical-chemical properties of the lubricant oils. Findings – A dataset of 42 spectra measured from oil standards was studied to assess the concentration of copper into the oils and, thus, evaluate the wearing of the machinery. It was found that the use of SVR was very advantageous to get a regression model. Originality/value – The use of genetic algorithms coupled to SVR was considered in order to reduce the time needed to find the optimal parameters required to get a suitable prediction model