Imágenes de una revolución: la caída del muro de Berlín en los medios de comunicación

El presente trabajo de fin de grado trata del tratamiento que los medios de comunicación dieron a la caída del muro de Berlín en 1989, a través de una exposición de imágenes, publicadas por los periódicos más influyentes de España en la época: El País, La Vanguardia y el ABC.Grado en Relaciones Laborales y Recursos Humano

Nanostructured Gd0.8Sr0.2Fe0.8M0.2O3 (M=Cr, Ga) materials for solid oxide fuel cell cathodes

AbstractPolycrystalline samples of Gd0.8Sr0.2Fe0.8M0.2O3 (M=Cr, Ga) are prepared by combustion route and pore wetting technique in order to compare the influence of the morphology in the performance of two cathodes for Solid Oxide Fuel Cells. When polycarbonate membranes are used as templates nanowire arrays with a diameter of 50–70 nm are obtained. Comparing the results obtained by Electrochemical Impedance Spectroscopy (EIS) measurements, it is clearly observed that the cathodic resistance considerably decreases when optimized synthesis parameters are used, obtaining a better performance for the Gd0.8Sr0.2Fe0.8Ga0.2O3 nanowires with an area specific resistance (ASR) value at 850∘C of 0.195 Ω cm2

Buscando un modelo

Ruiz De Larramendi, Y. (1990). Buscando un modelo. Nosferatu. Revista de cine. (2):24-27. http://hdl.handle.net/10251/40743.Importación Masiva2427

Unraveling the Effect of Singlet Oxygen on Metal-O2 Batteries: Strategies Toward Deactivation

Aprotic metal-O(2)batteries have attracted the interest of the research community due to their high theoretical energy density that target them as potential energy storage systems for automotive applications. At present, these devices show various practical problems, which hinder the attainment of the high theoretical energy densities. Among the main limitations, we can highlight the irreversible parasitic reactions that lead to premature death of the battery. The degradation processes, mainly related to the electrolyte, lead to the formation of secondary products that accumulate throughout the cycling in the air electrode. This accumulation of predominantly insulating products results in the blocking of active sites, promoting less efficiency in system performance. Recently, it has been discovered that the superoxide intermediate radical anion is involved in the generation of the reactive oxygen singlet species (O-1(2)) in metal-O(2)batteries. The presence of singlet oxygen is intimately linked with electrolyte degradation processes and with carbon-electrode corrosion reactions. This review analyzes the nature of singlet oxygen, while clarifying its toxic role in metal-O(2)batteries. Besides, the main mechanisms of deactivation of singlet oxygen are presented, trying to inspire the research community in the development of new molecules capable of mitigating the harmful effects related to this highly reactive species.This work was supported by the Ministerio de Economia y Competitividad of Spain (under projects MAT2016-78266-P and PID2019-107468RB-C21), the Fondo Europeo de Desarrollo Regional (FEDER), and the Eusko Jaurlaritza/Gobierno Vasco (under project IT1226-19). NO-V also acknowledges the Basque Government (Elkartek CICe2020, KK-2020/00078) for the financial support of this work

La brecha salarial de género en España = The gender pay gap based on sex

El presente trabajo trata de ofrecer el estudio de un fenómeno de gran trascendencia en la actualidad, la discriminación salarial a la que se enfrentan numerosas mujeres en sus relaciones laborales, también conocido como brecha salarial de género y que se constituye como uno de los mayores problemas a resolver por parte de los poderes públicos para lograr la igualdad efectiva entre hombres y mujeres.La intención es aportar datos concretos que reflejen en qué momento se encuentra el fenómeno y el tratamiento que se ha dado a la diferencia salarial por razón de sexo, resaltando la importancia del principio de igualdad retributiva, hoy reconocido en prácticamente todos los estados y los trabajos de igual valor. Se proyectan también algunos de los factores que han motivado la aparición de tales diferencias en los salarios. Finalmente, tras el estudio realizado, se ofrece una serie de propuestas encaminadas a erradicar dichas discriminaciones, así como unas conclusiones que sirvan de síntesis final

Nanostructured Manganese Dioxide for Hybrid Supercapacitor Electrodes

Hybrid supercapacitors, as emerging energy storage devices, have gained much attention in recent years due to their high energy density, fast charge/discharge and long cyclabilities. Among the wide range of systems covered by this topic, low cost, environmental friendliness and high power provide MnO2 with great characteristics to be a competitive candidate. The present work reports a hybrid aqueous supercapacitor system using a commercial activated carbon as the negative electrode and a synthesized manganese dioxide as the positive electrode. Two manganese dioxide polymorphs (α-MnO2 and δ-MnO2) were tested in different neutral and basic aqueous electrolytes. In this way, full cell systems that reached an energy density of 15.6 Wh kg−1 at a power density of 1 kW kg−1 were achieved. The electrode–electrolyte combination explored in this study exhibits excellent performance without losing capacity after 5000 charge/discharge cycles, leading to a promising approach towards more sustainable, high-performance energy storage systems.This research was funded by the Ministerio de Ciencia, Innovación y Universidades (PID2019-107468RB-C21 and TED2021-131517B-C21) and Gobierno Vasco/Eusko Jaurlaritza (IT1546-22)

Guía sociológica de aspirantes al matrimonio Centón enciclopédico de Filosofía científica materialista pedantísima...

I. Primera serie. Ydeorama familiar con una breve noticia necrológica del autor y su divagación sobre la sociología del humorism