Search results for "Todos"
showing 10 items of 330 documents
Global Spaces for Local Politics: An Exploratory Analysis of Facebook Ads in Spanish Election Campaigns
2021
[EN] Sponsored content on Facebook has become an indispensable tool for implementing political campaign strategies. However, in political communication research, this channel is still unexplored due to its advertising model in which only target audiences are exposed to sponsored content. The launching of the Facebook Ad Library in May 2018 can be considered a turning point in this regard, inasmuch as it now offers users direct access to ads paid for by political parties, among other advertisers. This paper analyzes some aspects of the strategies implemented by six national parties during the campaigns running up to the two general elections held in Spain in 2019, by performing an analysis o…
Citizen science for scientific literacy and the attainment of sustainable development goals in normal education
2020
Curricular integration of the formal teaching of citizen science can bring to the classroom aspects of scientific literacy that encourage the involvement of citizens. In particular, these include non-epistemic aspects related to the sociology of science (which are often not transferred to the classroom). Furthermore, this practice raises awareness among students, and encourages them to become participants in the attainment of the United Nations&rsquo
Triblock SEBS/DVB crosslinked and sulfonated membranes: Fuel cell performance and conductivity
2021
[EN] A set of styrene-ethylene-butylene-styrene triblock copolymer (SEBS) membranes with 10 or 25 wt.% divinyl-benzene (DVB) as a crosslinking agent were prepared and validated. Physicochemical characterization revealed suitable hydrolytic and thermal stability of photo-crosslinked membranes containing 25%wt. DVB and post-sulfonated. These compositions were evaluated in H2/O2 single cells, and electrical and proton conductivities were furtherly assessed. The membranes with the milder post-sulfonation showed greater proton conductivity than those with excessive sulfonation. In terms of electrical conductivity, a universal power law was applied, and the values obtained were low enough for bei…
Influence of substrate and temperature on the biodegradation of polyester-based materials: Polylactide and poly(3-hydroxybutyrate-co-3-hydroxyhexanoa…
2020
[EN] The extended use of polymers from renewable resources such as aliphatic polyesters or polyhydroxyalkanoates boosted the necessity to understand their behaviour in an end-of-life scenario. Although they can be degraded in reasonable shorter times than traditional polymers, understanding the degradation mechanisms under dissimilar conditions will contribute to further developments in this field. This work aimed to study the effect of temperature and substrate in the degradation of polylactide (PLA) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) in a simulated laboratory scale to ascertain their contribution, separately or in combination. For this purpose, nine parallel degradat…
Poly (lactic acid)/D-limonene/ZnO bio-nanocomposites with antimicrobial properties
2022
[EN] Antimicrobial films of poly (lactic acid) (PLA)/D-limonene/zinc oxide (ZnO)-based bio-nanocomposites were prepared via melt compounding and subsequent thermocompression. D-limonene was incorporated at concentrations of 10 or 20 wt%, and ZnO pure nanoparticles and those organically modified with oleic acid (O-ZnO), with an average diameter of 13.5 nm, were included at concentrations of 3, 5, and 8 wt%. The plasticizing effect of D-Limonene was corroborated by a decrease in the glass transition temperature compared to pure PLA. The presence of ZnO and O-ZnO in the PLA matrix promoted a slight increase in the degree of crystallinity due to its nucleant performance. Although ZnO and O-ZnO …
La investigación cualitativa en las revistas españolas de ciencias del deporte (2007-2011)
2015
El objetivo de este estudio fue determinar el estado de la investigación cualitativa en las ciencias de la actividad física y del deporte en España, a partir del análisis de 1057 artículos publicados entre 2007 y 2011 en revistas españolas del campo indexadas en Scopus. Los resultados indican que sólo el 3.5% de los trabajos recurre a la metodología cualitativa y que en su mayor parte utilizan la entrevista como técnica de recogida de datos. Se señala como conclusión que la investigación cualitativa en las ciencias de la actividad física y el deporte en España se encuentra todavía en estado embrionario. The aim of this study was to determine the status of qualitative research in sport scien…
Efficient Analysis of Arbitrarily Shaped Inductive Obstacles in Rectangular Waveguides Using a Surface Integral Equation Formulation
2007
In this paper we propose to use the Surface Integral Equation technique for the analysis of arbitrarily shaped Hplane obstacles in rectangular waveguides, which can contain both metallic and/or dielectric objects. The Green functions are formulated using both spectral and spatial images series, whose convergence behavior has been improved through several acceleration techniques. Proceeding in this way, the convergence of the series is not attached to the employment of any particular basis or test function, thus consequently increasing the flexibility of the implemented technique. In order to test the accuracy and numerical efficiency of the proposed method, results for practical microwave c…
La comunicación en los foros virtuales: lenguaje, discurso e intercambio de información
2014
Las tecnologías de la información y de la comunicación han modificado de forma muy evidente nuestros mecanismos de comunicación interpersonal, llegando a transformar profundamente tanto las posibilidades, herramientas y modalidades de contacto entre las personas (López-García, 2005), como nuestra manera de construir la información, acceder a ella, almacenarla, reproducirla y difundirla. En la sociedad del conocimiento la información se convierte cada vez más en una verdadera materia prima, ahora mismo muy abundante y valiosa en la red, que es necesario buscar, valorar, gestionar, almacenar y difundir (Castells, 2000). En el presente trabajo esbozaremos algunas de las características princip…
Teleformación: Diseño para Todos
1998
Docència i lliure accés: l'Open Course Ware de la Universitat de València
2008
En este artículo presentamos la Oficina OCW de la Universitat de València atendiendo al contexto general de aparición y sus características específicas. En primer lugar, contextualizamos el Open Course Ware en el ámbito de los movimientos Open y repasamos algunas de sus iniciativas. Después nos centramos en la caracterización de los usuarios/destinatarios prototípicos del OCW como “nativos digitales”, atendiendo a la distinción de dos modelos epistemológicos: la inteligencia colectiva (nativos) y el paradigma del experto (inmigrantes digitales), algunas de cuyas premisas básicas se explican solamente por la aparición de las tecnologías digitales. Tras esta contextualización teórica, exponem…