University Europea Of Canarias

Santa Cruz de Tenerife, Spain

University Europea Of Canarias

Santa Cruz de Tenerife, Spain
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Barbero-Barrera M.D.M.,Technical University of Madrid | Flores-Medina N.,University Europea Of Canarias | Perez-Villar V.,Technical University of Madrid
Construction and Building Materials | Year: 2017

European standards place great emphasis on the reintroduction of waste in the production chain. In this research, a combination of experimental tests has been carried out to analyse the use of revalorized isostatic graphite powder waste in gypsum-based boards. A series of gypsum pastes was prepared with a graphite content ranging from 0% to 25%, by weight substitution, and two w/b ratios. Its addition significantly increased the bulk density, thermal conductivity and emissivity of the samples until 19%, 97% and 10%, respectively. Additionally, a reduction of 54% in thermal fluxes towards the outside can be achieved when graphite-gypsum boards replaced gypsum ones at radiative constructive solutions. © 2017 Elsevier Ltd

Medina N.F.,Technical University of Madrid | Medina N.F.,University Europea Of Canarias | Medina D.F.,Technical University of Madrid | Hernandez-Olivares F.,Technical University of Madrid | Navacerrada M.A.,Technical University of Madrid
Construction and Building Materials | Year: 2017

In this paper, an analysis of the mechanical and thermal properties of a sustainable concrete incorporating crumb rubber (CR) and steel or plastic fibres partially coated with rubber (FCR) is presented. Whereas CR is normally used as aggregate in concrete, FCR is a new aggregate. FCR consists of fibres partially coated with crumb rubber recovered from the tyre recycling process, during granulation and before the total separation of rubber. The mechanical properties of concrete with rubber getting up to 100% volume substitution of stone aggregate have been obtained through compressive, bending, impact and wear resistance tests. Young's modulus, toughness, toughness index and impact energy absorption are also studied. Concrete with FCR aggregate presents the same or even better mechanical behaviour than conventional rubberized concrete. The thermal conductivity (k) of concrete with FCR as aggregate is comparable to the k of concrete with CR, and it is also lower than the reference concrete. Finally, some proposals of constructive systems with rubberized concrete for thermal rehabilitation of buildings are analysed using pseudotime-dependent software, for which a significant reduction of the thermal fluxes can be observed. © 2017 Elsevier Ltd

Barbero-Barrera M.M.,Technical University of Madrid | Flores Medina N.,Technical University of Madrid | Flores Medina N.,University Europea Of Canarias | Guardia-Martin C.,University of Alcalá
Construction and Building Materials | Year: 2017

The use of waste materials contributes to the improvement of the life cycle assessment of building materials, while traditional binders with a low carbon footprint enhance building sustainability. Isostatic graphite powder waste has not been used in the industry in spite of the huge quantities of it around the world. However, hydraulic lime is a traditional binder which requires low energy during manufacture. Hence, the aim of our research was to investigate the possibility of incorporating graphite waste powder into hydraulic lime pastes. Batches with different hydraulic lime NHL-5 replacements by graphite, ranging from 0% to 50%, with and without plasticizer were blended. Their mechanical characteristics and physical characteristics, namely, water absorption and thermal properties, together with the microstructure were analyzed. Among other effects, the addition of EDM graphite increased the compressive strength of the samples by almost three times while reducing the open porosity and the water absorption coefficient, enabling a wider use of these limes in building applications. © 2017 Elsevier Ltd

Sanchez-Mena A.,University of Valencia | Sanchez-Mena A.,University Europea Of Canarias | Marti-Parreno J.,University of Valencia
Journal of E-Learning and Knowledge Society | Year: 2017

Educational video games (EVGs) are receiving an increasing attention as an approach to teach new generations of learners, such as millennials, who make an intense use of video games, interactive technologies, and digital networks. Extant academic literature suggest several benefits of using EVGs including increasing students’ motivation towards learning and enhancing engagement in the learning process. However, teachers are the real agents of change in the classroom and they choose whether to adopt or nor a given technological innovation in their courses. While a great effort has been devoted over the last years to better understanding EVGs effects on learning, research on teachers’ acceptance of EVGs is scarcer. Moreover, to the best of our knowledge, no comprehensive literature review has been undertaken to summarize the main findings of this stream of research. To fill this research gap, the main goal of this study is to provide a comprehensive literature review on teachers’ acceptance of EVGs. Main findings suggest a wide range of barriers and drivers influencing teachers’ acceptance of EVGs including i) technical and organizational support, ii) training on EVGs, iii) previous gaming experience, and iv) personal factors such as openness and innovativeness. Findings are summarized in nine propositions with implications for Teacher Training Programmes development. © 2017, Italian e-Learning Association. All rights reserved.

Dominguez-Rodriguez A.,Hospital Universitario Of Canarias | Dominguez-Rodriguez A.,University Europea Of Canarias | Abreu-Gonzalez P.,University of La Laguna
Emergencias | Year: 2015

Diagnosing acute coronary syndrome (ACS) in the emergency department is often a complex process. Inflammatory markers might be useful for the rapid assessment of a patient’s overall risk and might also help predict future episodes. The clinical use of these biomarkers could potentially lower the number of emergency visits and help in the prevention of future adverse events. The aim of this review was to evaluate the clinical utility of markers of cardiovascular inflammation in emergency patients with ACS. Based on a critical analysis of a selection of the literature, we concluded that none of the biomarkers of cardiovascular inflammation would at present be useful for stratifying risk in emergency situations, aiding prognosis, or guiding therapy for patients with ACS. © 2015 (publisher). All Rights Reserved.

Fageda X.,University of Barcelona | Jimenez J.L.,University of Las Palmas de Gran Canaria | Valido J.,University Europea Of Canarias
Transportation Research Part A: Policy and Practice | Year: 2016

This paper examines the impact on prices of various regulatory changes in residents’ flight subsidies implemented in Spain in recent years. It draws on a large sample of domestic routes for the period 2003–2013 to estimate a price equation that accounts for the panel data and the potential endogeneity of specific explanatory variables. Price differences were not found between the treated routes (routes affected by the discounts) and the control routes (routes not affected by the discounts). This is the case regardless of the discount percentage on prices that island residents enjoy. © 2016 Elsevier Ltd

Flores Medina N.,University Europea Of Canarias | Barluenga G.,University of Alcalá | Hernandez-Olivares F.,Technical University of Madrid
Construction and Building Materials | Year: 2015

Early age shrinkage and cracking, water permeability and carbonation depth of concretes with natural Pozzolans blended cement (NPC) were investigated in order to assess the combined effect of Polypropylene short fibers (PPF) and Silica Fume (SF) on some durability parameters. The addition of 10% of SF increased compressive strength, shrinkage and cracking, permeability and carbonation depth. But, the combination of 10% SF and 0.07% PPF volumetric fraction mitigated early age cracking and significantly reduced water permeability and carbonation depth. The use of PPF in NPC concrete combined with SF can be recommended to reduce long-term impact of early age cracking, and enhance durability. However, cement should not be reduced when SF is added to mixtures without PPF, because lower CaO reserves may affect final pH, leading to concretes more sensible to carbonation. © 2015 Elsevier Ltd. All rights reserved.

Salvador P.,CIEMAT | Alonso-Perez S.,CSIC - Institute of Environmental Assessment And Water Research | Alonso-Perez S.,Research Center Atmosferica Of Izana | Alonso-Perez S.,University Europea Of Canarias | And 6 more authors.
Atmospheric Chemistry and Physics | Year: 2014

The occurrence of African dust outbreaks over different areas of the western Mediterranean Basin were identified on an 11-year period (2001-2011). The main atmospheric circulation patterns causing the transport of African air masses were characterized by means of an objective classification methodology of atmospheric variable fields. Next, the potential source areas of mineral dust, associated to each circulation pattern were identified by trajectory statistical methods. Finally, an impact index was calculated to estimate the incidence of the African dust outbreaks produced during each circulation pattern, in the areas of study.

Four circulation types were obtained (I-IV) and three main potential source areas of African dust were identified (Western Sahara and Morocco; Algeria; northeastern Algeria and Tunisia). The circulation pattern I (24% of the total number of episodic days) produced the transport of dust mainly in summer from Western Sahara, southern Morocco and Tunisia. The circulation pattern IV (33%) brings dust mainly from areas of northern and southern Algeria in summer and autumn, respectively. The circulation pattern II (31%) favored the transport of dust predominantly from northern Algeria, both in spring and summer. Finally, the circulation type III was the less frequently observed (12%). It occurred mainly in spring and with less intensity in winter, carrying dust from Western Sahara and southern Morocco.

Our findings point out that the most intense episodes over the western Mediterranean Basin were produced in the summer period by the circulation type I (over the western side of the Iberian Peninsula) and the circulation type IV (over the central and eastern sides of the Iberian Peninsula and the Balearic Islands). © Author(s) 2014.

Flores Medina N.,University Europea Of Canarias | Flores Medina N.,Technical University of Madrid | Barbero-Barrera M.M.,Technical University of Madrid | Bustamante R.,Technical University of Madrid
Construction and Building Materials | Year: 2016

The study here exposed was developed in order to contribute to the recycling and re-valorization of isostatic graphite powder as filler in gypsum pastes. Graphite powder is a waste product obtained from isostatic graphite blocks ground for mold production. The design of these molds is previously processed by Computer-Aided Manufacturing (CAM) and CAD/CAM software applications that uses a tool path for three-dimensional modeling to assist computer-numerically controlled (CNC). In order to contribute to the knowledge of this material as filler, this paper describes and assesses the microstructure of gypsums with graphite, through the use of a Scanning Electron Microscope and an Energy Dispersive X-ray Spectroscopy (SEM/EDX). Furthermore, the density, water absorption, and mechanical properties of gypsum pastes with addition of graphite filler have been analyzed. In order to deepen on the knowledge of the influence in the behavior of gypsum commonly used in building, several series of gypsum pastes with 0-5-10-15-20-25% of graphite filler by weight replacement of gypsum, and three different water/gypsum ratios - one of them with plasticizer - have been tested. It was observed that isostatic graphite powder from milled molds for Electrical Discharge Machining (EDM) significantly increases the mechanical properties of the gypsum pastes, more than other conventional fillers. This has been achieved by the great compatibility of the gypsum microstructure and the graphite micro-grains, which fill the microstructure of the pastes and increase the density of the hardened paste. The progressive increase of the amount of graphite influences the pastes properties, increasing their density and their mechanical resistances and reducing their porosity. © 2015 Published by Elsevier Ltd.

Nogue S.,Grupo de Investigacion Urgencias Procesos y Patologias | Burillo-Putze G.,Hospital Universitario Of Canarias | Burillo-Putze G.,University Europea Of Canarias
Medicina Clinica | Year: 2014

Cocaine is the second most consumed illegal drug in the western world, following cannabis. Since 1998, it is also the drug that more attendances generate in different emergency devices, and it is responsible for more of 60% of the emergencies directly related to drug consumption. This work reviews the main Spanish scientific articles published in the last 10 years, in which different factors related to the use of this drug have been analyzed in relation to the use of emergency by cocaine users. A total of 8,795 patients were included (interval 57-1,755), with an average age of 32.64 years (SD 3.02), and an average percentage of positives to cocaine of 54.78% (SD 47.03); there were 7 works with 100% of subjects being positive to cocaine. Males predominated with an average of 78.69% (SD 12). They presented cardiovascular symptoms in 30% cases (SD 22.7), neurological symptoms in 11.6% cases (SD 4.28) and psychiatric symptoms in 49.32% cases (SD 23.87). There was a multiple consumption in 49.02% of patients (interval 4.3-76.2), fundamentally associated with alcohol (57.78%, SD 6.18) and cannabis (21.56%, SD 10.72). Two hundred and forty-six patients (2.8%) needed admission and 8 died (0.09%). © 2013 Elsevier España, S.L.U.

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