e-cienciaDatos
Not a member yet
1765 research outputs found
Sort by
Green hydrogen production through low temperature thermochemical water splitting cycles based on non-ordered and ordered macroscopic structures of La0.6Sr0.4Co0.2Fe0.8O3±δ perovskite
No full textThe production of green hydrogen is one of the main targets of current energy and environmental policies. In this context, thermochemical water splitting is one of the potential methodologies that enable its production. This
process is based on the thermal reduction of a metal oxide, followed by its re-oxidation with water releasing hydrogen. The main problem of this process, which hinders its full-scale application, is that reducing the metal oxide usually requires very high temperatures (>1500 °C). To decrease this reduction temperature, nonstoichiometric oxides such as perovskites have been proposed. In a previous work, the authors have presented La1-xSrxMeO3±δ (x = 0.2–0.4; Me = Mn, Fe and Co) perovskites as active materials decreasing the operation temperature to 1400 °C. However, those perovskites showed a significant lack of stability upon cycling, limiting their use in a future scale-up of the process. In this work, we present a multi-substituted perovskite type A1-xA’xB1-yB’yO3±δ (La0.6Sr0.4Co0.2Fe0.8O3±δ, named LSCF) as redox material with increasing stability and remarkable activity in the hydrogen production cycles even at temperatures below 1000 °C. This material was synthesised by reactive grinding as a green synthesis method optimising the variables of the process. Three reduction temperatures for the thermochemical water splitting were evaluated in the range 800–1200 °C at the same oxidation temperature of 800 °C. LSCF perovskite has been used in powder form with a H2 production of 5.22 cm3STP/gmaterial⋅cycle when the reduction was performed at 800 °C and 6.83 cm3STP/gmaterial⋅cycle when this reduction step was performed at 1000 °C. Afterwards, the LSCF was shaped into two different macroporous structures looking for a potential scaling-up of the process: reticulated porous ceramic structure (RPC) and a ceramic monolith structure with straight and well-ordered channels in which the perovskite forms a thin layer over the internal channels surface. The macroscopic structures exhibited good activity and stability working isothermally at 800 °C under N2 atmosphere, reaching H2 productions higher than 10 cm3STP/gmaterial⋅cycle. Particularly, the monolithic structure, characterised by its open macroporosity improves the heat transfer phenomena and the contact between the gas-phase and the perovskite, obtaining a stable hydrogen production under isothermal conditions of 17 cm3STP/gmaterial⋅cycle at 800 °C. That could be increased up to 32.5 cm3STP/gmaterial⋅cycle when the reduction step of the thermochemical water splitting is performed at 1000 °C. To the best of our knowledge, this is the higher value obtained for hydrogen production by a perovskite in this application at this reaction conditions. These results confirm the LSCF as a potential material for green hydrogen production by low-temperature thermochemical cycles
Optimizing standardized lab-grown skin substitutes reveals a proliferation-differentiation switch based in ascorbic acid
No full textThe project "From 2D to 3D: Optimization of lab-grown skin substitutes reveals a physiological switch based on ascorbic acid." aimed to provide culture conditioning and adjusting of keratinocytes intended to be used in differentiation processes. The keratinocytes were evaluated on their capacity to generate competent skin constructs as a model of cellular differentiation. The influence of ascorbic acid in 2D and 3D epidermal models was characterized, as it was found to act as a physiological switch.This dataset comprises raw images obtained in the 2D and 3D analysis. The keratinocytes used correspond to HaCaT cells cultured under low calcium conditions. The results associated with FACS results should be carefully analyzed considering the differentiation trigger caused by detachment of the cells. For more information please refer to the related publications associated to this dataset
Raw data for metagenomic analyses of environmental samples taken in a pig farm in Spain
No full textMetagenomic study of environmental samples collected at a pig farm in Spain.
This study is part of the HE-FARM project under the Horizon Europe programme, which aims to improve biosecurity on farms.
Bacterial genera present in several areas of a pig farm were analyzed using high-throughput sequencing techniques. Samples were collected from the skin and feces of animals, as well as from surfaces, water, and air. The analyses revealed a strong cor-relation between air and skin samples, supporting the idea that bacterial growth on skin is potentially a mechanism of aerosolization and airborne transport. A water–air trans-mission route also appears to be present, although the direction of the transport mecha-nism cannot yet be determined. Other potential routes, such as contact with surfaces or feces, seem to be less efficient.
This data contains the raw data used for metagenomic analyses (16S) of environmental samples in a pig farm.
It includes the genomic data for each sample analyzed and compared in the study titled 'Skin Aerosolisation Predominance in a Pig Farm'. The data is organized in a way that facilitates further exploration and analysis, ensuring that researchers can effectively utilize it for their own studies.</p
Advocacy and Alternatives in European Disinformation Regulation (AAEDR): A Multi-Method Dataset (QDA, SNA, DNA, QCA)
No full textRECLAIM is a Horizon Europe Project analysing the various expressions of information disorder on today's democracy. The aim of the project is to understand the impact of disinformation in Europe and use the results to advise on policy making, education and actions to react to the negative effect of disinformation on democratic discourse and the basic structure of modern liberal democracy. The project is managed by the Institute of International Affairs and led by Maximilian Conrad, Professor at the University of Iceland's Faculty of Political Science.
This dataset has been produced by WP7 (Universidad Autónoma de Madrid) on regulatory aspects. The objective of WP 7 is to analyse how normative conceptions of public debate in democracy relate to different policy alternatives and political strategies to combat disinformation by using political theory to conceptualize debates on regulation and public policy about post-truth (in cooperation with WP2); analyse public policy struggles to define the best way to combat disinformation at the European level and analyse the impact upon communication professionals and journalistic practices of the emerging regulations adopted by EU (in cooperation with WP4).
The dataset consists of 4 subsets:
4.1. A csv record of actors classified by the following attributes: type of actor; degree of involvement in policy-making (insider or outsider) level of organization; main policy domain of activity.
4.2. One codebook in CSV format that distinguishes the frames – what the respondants speak about, in order to identify themes, diagnoses and frames – and claims – more specific and targeted demands.
4.3. Two networking datasets, one for Discourse Network Analysis actors that support or oppose statements into patterns of relations (Leifeld 2017) and the second for Social Network Analysis inlcuding information on their patterns of relations during the consultations and their joint participation in meetings with Commission officials.
4.4. fsQCA dataset calibrating the relative number of regulatory demands and presence of insider vs outsider groups.
</ul
A Hybrid Escape Room to Foster Motivation and Programming Education for Pre-Service Teachers
No full textEducational escape rooms aims to motivate students, to strengthen knowledge and evaluate learning. Pre-service teachers enrolled in “Computer Science and Digital Competency” course shows lack of motivation and difficulties to realise its usefulness in everyday practice, becoming an ideal context to apply this strategy. 157 students belonging to a European university participated in the experience as case study. The educational escape room was conducted following a hybrid model, mixing a physical organization of props with a virtual organization of the narrative, tests and achievements. The experiment was designed to answer two hypotheses, first if applying escape room as an educational strategy fosters pre-primary and primary students’ motivation, since this method address complex concepts in a practical way, and second, if the application of this strategy as teaching strategy makes students perceive the learning process as a game
Corpus of X posts of Spanish and Brazilian far-right populisms (Abascal and Bolsonaro, 2020-2021)
No full textThe project's main aim is to explore the discursive construction of polarisation and national identity in a corpus of X posts of Santiago Abascal and Jair Bolsonaro, the main far-right populist leaders in Spain and Brazil, respectively. The corpus covers the years 2020 and 2021, that is, the key years in the Covid-19 pandemic, so as to provide a recent account of these extreme populisms. To analyse polarisation in this context and corpus, the project looks at different construal operations, including polarising metaphors, image schemas (especially force dynamics), profiling, metonymy and specificity.
This corpus contains a sample of X posts (formerly tweets) posted in Santiago Abascal and Jair Bolsonaro's official X accounts (@Santi_ABASCAL and @jairbolsonaro, respectively) during the years 2020 and 2021. Both original posts and quoted tweets are included. Reposts and responses were excluded, as well as posts in languages other than Spanish and Portuguese and those containing only emojis and images. The corpus adds up to a total number of 4992 posts (152407 words).
The corpus was divided into two subcorpora for practical purposes, each corresponding to the politicians under study, i.e., Santiago Abascal and Jair Bolsonaro.</p
A Review of Additive Manufacturing of Biodegradable Fe and Zn Alloys for Medical Implants Using Laser Powder Bed Fusion (LPBF)
No full textThis review explores the advancements in additive manufacturing (AM) of biodegradable iron (Fe) and zinc (Zn) alloys, focusing on their potential for medical implants, particularly in vascular and bone applications.
This review focuses on the advancements in AM, with a particular emphasis on LPBF for processing Fe and Zn biodegradable alloys. It explores how LPBF can optimize the microstructure, mechanical performance, and corrosion behavior of these materials to meet clinical requirements. The review also examines the biocompatibility of Fe and Zn alloys in both in vitro and in vivo settings, aiming to advance their development as next-generation bioresorbable implants for medical applications.
Methodology:
Review of the advancements in additive manufacturing (AM) of biodegradable iron (Fe) and zinc (Zn) alloy
Datos de la investigación: Desinformación en situaciones de emergencia: estudio del caso de las agencias de verificación durante la DANA en España
No full textPropósito. Este estudio analiza la actuación de las agencias españolas de verificación ante la desinformación surgida durante la DANA en España en octubre de 2024, evaluando su capacidad para contrarrestar bulos en situaciones de emergencia. Metodología. Se emplea una investigación de carácter cuantitativo, exploratorio y descriptivo mediante un análisis de contenido (n = 438) con sistema de codificación propio, centrado en tres agencias pertenecientes a la IFCN. Resultados y conclusiones. Los resultados muestran el papel crucial de las redes sociales como canales de propagación de la desinformación y evidencian distintas estrategias de las agencias: mientras Maldita y EFE Verifica priorizaron el desmentido de bulos, Newtral apostó por contenidos explicativos. Predominaron los contenidos engañosos, con menor presencia de teorías conspirativas y discursos de odio. Aportación original. Este trabajo ofrece una visión integral del comportamiento de las agencias de verificación ante un fenómeno de desinformación en tiempo real, aportando evidencia empírica sobre su rol en la gestión comunicativa de crisis
When more pumas (Puma concolor) do not change perception: The mismatched response of ranchers to the presence of a top carnivore. Raw data
No full textStructured interviews with livestock ranchers were conducted in the proposed Torres del Paine UNESCO-Biosphere Reserve (Chilean Patagonia) in 2011 and 2018. We recorded information regarding their perceptions of puma presence, the potential danger pumas pose to livestock, livestock losses, and the need to control puma populations. In parallel, puma presene was surveyed and the potential distribution of the species in both periods was modelled using MaxEnt. Statisticak analyses were afterwards done to determine whether predicted puma presence explained ranchers’ perceptions of pumas or any change in their perceptions over the course of the study.
Puma distribution models predicted that the puma has expanded across the study area and that the likelihood of puma relative abundance within ranches increased over time. Despite this, ranchers did not change their perceptions of puma abundance or the losses they suffer from puma predation. Neither did they feel an increased need to manage the puma population. Furthermore, ranchers reported an increase in the perception that pumas are a threat to livestock in the second study period, but this perception was not linked to the likelihood of puma presence.</p
Datos de valoración afectiva del corpus léxico por participante e ítem y datos de todas las variables para análisis estadístico
No full textDatos de investigación del estudio Modelos de valoración afectiva del léxico en español como segunda lengua. Revista Signos. Estudios De Lingüística, 57(116), 652–677.
Se enmarca en el proyecto Comunicación, emoción e identidad en la adquisición y aprendizaje del español como segunda lengua, línea de investigación de de Adquisición del léxico y construcción del espacio semántico emocional.
Puntuaciones de valoración afectiva subjetiva obtenidas por los participantes.</p