Resultados de investigación

The objective of this article is to investigate the asymmetric end notched flexure (AENF) test. The AENF test specimen consists of two sublaminates with different stiffnesses (dissimilar elastic properties and/or thicknesses). A key observation in this test is that AENF test specimens exhibit different fracture behaviour depending on their positioning in the test. Depending on the position of the stiffer sublaminate, ‘local contact’ or ‘global contact’ may occur along the cracked arms giving rise to different contact pressure distribution. This variation in the contact pressure distribution leads to different fracture behaviour at the crack tip: mixed-mode I/II or pure mode II. This work demonstrates that a straightforward experimental or numerical compliance calibration (CC) procedure can effectively determine the total energy release rate (ERR) in mixed-mode conditions (G=GI+GII) or the mode II component (GII) when pure mode II is present, depending on the positioning of the specimen. The criterion established by other authors under which the AENF test configuration exhibits pure mode II at the crack tip was also reviewed. In this case, analytical formulations developed by other authors were compared with the CC procedure and the virtual crack closure technique (VCCT). Finally, this article examines the influence of several test parameters on the mode mixity. These parameters include the specimen degree of asymmetry, the initial crack length, and the degree of the deformation applied during the test. The entire investigation was conducted using the finite element method (FEM)., This research received no external funding.

Este documento contiene una base de datos cualitativa de problemas de probabilidad diseñados y resueltos por Estudiantes para Maestro (EPM) del tercer curso del Grado en Maestro/a en Educación Primaria de la Universidad de Oviedo, con formación previa en los contenidos de estadística, probabilidad y resolución de problemas y su didáctica. El documento está estructurado en tres bloques, cada uno con un enunciado que varía en función de la naturaleza del estudio original. El objetivo de este estudio era analizar el conocimiento matemático para la enseñanza de los EPM a través de la creación y resolución de problemas de probabilidad dirigidos a un nivel educativo específico. La metodología utilizada fue la investigación-acción, un enfoque cíclico que implica planificar la investigación, recoger los datos, analizarlos y, a partir de las conclusiones obtenidas, reformular el instrumento de recogida para iniciar un nuevo ciclo con el instrumento modificado. Cada bloque corresponde a una de las tres iteraciones de investigación-acción realizadas durante el estudio, por lo que, al comienzo de cada uno de ellos, se presenta el instrumento utilizado en esa fase para la recogida de datos. Los datos han sido recogidos de manera anónima y se presentan en el formato original proporcionado por cada EPM (textual, tabular, imagen o una combinación de varios de esos formatos). Dado que reflejan el estado en el que fueron entregados, debe tenerse en cuenta que pueden contener faltas ortográficas, errores de formato o matemáticos, o estar incompletos.

Dataset asociado a la publicación: "Impact of the phase change material (PCM) integration on the mortar’s thermal inertia: The role of the aggregates and PCM types", This work was supported by the Spain Ministry of Universities (FPU21/05062 and EST24/00362) and the Spain Ministry of Science and Innovation through Research Projects PID2021-128056OA-I00 and RED2022-134219-T.

El proyecto SALMAFood aborda uno de los grandes retos contemporáneos a los que se enfrenta la alimentación en las sociedades actuales: la transformación hacia sistemas alimentarios más saludables, sostenibles y justos. A través de un enfoque interdisciplinar y multiactor, el equipo de investigación ha analizado el malestar ciudadano con la alimentación, los desafíos del sistema agroalimentario español y las propuestas de mejora impulsadas desde distintos sectores sociales. Los resultados de esta investigación permiten confirmar donde se encuentra los focos del malestar de la ciudadanía con el sistema alimentario, aunque también se ha visibilizado el bienestar que produce la comida. Esta dualidad ha sido posible al plantear un avance metodológico en el análisis del sistema alimentario, en el que se ha trabajado sobre los eslabones tradicionales (producción, industria, distribución y consumo) pero se ha añadido como elementos del sistema la preparación de los alimentos y la comensalidad, incorporando el hogar como espacio de análisis sobre la alimentación. Justificando teóricamente este aporte metodológico se ha confirmado un elevado y generalizado bienestar con la alimentación en el ámbito doméstico y también en la restauración. Los focos del malestar se sitúan en los agentes externos al hogar, los mediadores entre el comensal y el productor, siendo particularmente negativa la valoración que la ciudadanía hace de la transformación de los alimentos en la industria, aunque cabe destacar que esta insatisfacción está mediada por la gestión y la comensalidad domésticas. El proyecto ha permitido elaborar una tipología que representa las posiciones frente al bienestar y el malestar que produce el sistema alimentario español. Esta tipología describe los factores sociales que explican la actitud más crítica con el sistema alimentario, y presenta los grupos de población más conformistas y los más satisfechos con un sistema cuya fortaleza no está en los agentes intermediadores con el alimento, sino en aquellas esferas en las que la alimentación se hace propia y en espacios en los que se gestionan los riesgos que se le atribuyen a los eslabones mercantilizados del sistema alimentario. Pero esta tipología no solo se expresa a través de las condiciones estructurales de los individuaos relacionadas con la clase social (y esta es otra de las aportaciones del proyecto), sino con variables actitudinales, con disposiciones rutinizadas relacionadas con la cultura alimentaria, que explican las posiciones de la ciudadanía frente al sistema alimentario y que hemos denominado “posiciones alimentarias”. Este proyecto aporta un conocimiento de interés en la toma de decisiones en relación con las políticas alimentarias nacionales y permite anticipar dónde están los rechazos y dónde se sitúan las potencialidades para que el sistema alimentario español avance hacia un modelo alimentario más equitativo, resiliente y alineado con los objetivos de sostenibilidad., El malestar con la alimentación. Percepciones, actitudes y comportamientos de la población española hacia una alimentación saludable, sostenible y justa. PID2021-122721OB-C21

CFD data: CFD data related to the sensitivity analysis (Morris Method) and the optimization process. / Python code: Python code to import the Design Points associated with the sensitivity analysis (Morris Method) in ANSYS Workbench 23.2, Python code and CFD data associated with the Original Research Paper (ORP) entitled: "Multi-parametric optimization of a counter-rotating impulse turbine: A novel application of the Morris Method for Wave Energy Converters" authored by Aitor Vega-Valladares and co-authored by Manuel Garcia-Diaz, Bruno Pereiras and Manabu Takao. Aitor Vega-Valladares, Manuel Garcia-Diaz and Bruno Pereiras are members of the Fluids Engineering for Renewable Energy and Sustainability (FERES) research group, within the Department of Energy at the University of Oviedo. Professor Manabu Takao is a recognized expert in turbine design for Oscillating Water Column (OWC) devices from Matsue College in Japan. These datasets collect all the data used to prepare the ORP mentioned above, which arises as a collaboration between the aforementioned authors., At data collection date, Aitor Vega-Valladares was supported by the “Administración del Principado de Asturias” within the “Severo Ochoa” Program (grant number BP21-160).

Data Documentation for the Original Research Paper (ORP) entitled: "Analytical free streamline solutions for geometrical cavitation inside sharp-edged and profiled nozzles". This dataset contains MATLAB codes used to obtain the results presented in the ORP authored by Álvaro Pardo Vigil, José González Pérez and Adrián Pandal Blanco, all members of the FERES Research Group in the University of Oviedo. These datasets are protected under Creative Commons License: CC BY-NC-SA., Álvaro Pardo Vigil is supported by the Spanish Ministry of Science, Innovation and Universities within the “FPU” Program (grant reference FPU23/03450).This work was partially funded by Universidad de Oviedo and LINTER TECHNICAL CENTER, S.L., under the project “FUO-25-024: Modelo numérico 3D de la atomización de fluidos viscosos para la aplicación de tratamientos superficiales". Additional funding is provided by Subvenciones a Grupos de Investigación de Organismos Públicos de I+D+I del Principado de Asturias, Convocatoria 2024 IDE/2024/000724, ref.: SEK-25-GRU-GIC-24-045.

In addition to the files containing the scattered field measurements, a PDF file with the schematic of the measurement setup is included, as well as a sample code written in MATLAB. This code applies SAR processing based on the measurements from one of the planes and aims to demonstrate how to import one of the files and process the data to generate a reflectivity image of the region of interest., This dataset contains samples of the scattered field from a set of flat metallic objects. It includes several files corresponding to eight different measurement planes, where the distances between the plane containing the antennas and the plane containing the targets are 74.3913 cm, 66.4120 cm, 61.4173 cm, 56.4063 cm, 51.4131 cm, 46.3873 cm, 41.4244 cm, and 36.4289 cm. The measurement setup corresponds to a multistatic L-shaped configuration. Two open-ended waveguides were used as antennas, which were moved along the two sides of the L using two high-precision rails to transmit (Tx) and receive (Rx) signals from different positions in the acquisition array. For each Tx-Rx channel, a total of 201 equally spaced measurements of the S21 parameter were taken between 55 GHz and 60 GHz using a PNA-X device. In addition to the measurements with the metallic targets, the dataset includes two measurements with aluminum foil covering the support structure and two background measurements conducted using the same structure but without the targets. These background measurements in planes one and eight can be used to eliminate clutter caused by various environmental reflections.

Data contains readme file with an explanation to localize specific data. Three sets of data: Xray Photoemission data Magnetic Hysteresis loops data Xray Reflectivity data, The magnetic anisotropy of amorphous NdCo$_{4.6}$ compounds deposited by magnetron sputtering change with film thickness from in plane to out of plane anisotropy at thickness above 40 nm. Xray reflectivity measurements shows the progressive formation of an additional layer in between the 3 nm thick Si capping layer and the NdCo compound film. Hard Xray Photoemission spectroscoy (HAXPES) was used to analyze the composition and distribution of cobalt and neodymium at the top layers region of NdCo$_{4.6}$ films of thickness ranging from 5 nm to 65 nm using 7 keV, 10 keV and 13 keV incident photon energies, with inelastic electron mean free paths ranging from 7.2 nm to 12.3 nm in cobalt. The atomic cobalt concentration of the alloy deduced from HAXPES measurements at the Nd 3d and Co 2p excitations results to be below the nominal value, changing with thickness and incident photon energy. This proves a segregation of the rare earth at the surface of the NdCo$_{4.6}$ thin film which increases with thickness. The analysis of the background of the Co 2p and Nd 3d peaks was consistent with this conclusion. This demonstrates that neodymium incorporation in the cobalt lattice have a cost in energy which can be associated to strain due to the difference in volume between the two elements. The lowering of this strain energy will favor atomic anisotropic environments for neodymium that explains the perpendicular anisotropy and its thickness dependence of these NdCo compound films., European Synchrotron ESRF, the Spanish Ministerio de Ciencia, Innovacion y Universidades, and the Consejo Superior de Investigaciones Científicas for provision of synchrotron radiation at BM25 and for financial support through the projects PIE 2010-6-0E-013, 2021-60-E-030 and CEX2024-001445-S. J. D. and J. R-F. acknowledges Spanish Minister of Science and Innovation support under grants 104604RB/AEI/10.13039/501100011033 and PID2022-136784NB and by Agencia SEKUENS (Asturias) under grant UONANO IDE/2024/000678 with the support of FEDER funds

Dataset used in the evaluation of the paper "Heuristic-Based Incremental Local Domain Model Generation", currently under review in "Information and Software Technology". Context: Current front-end frameworks and technologies enable rich clients to operate autonomously without frequent server requests. To achieve this autonomy, clients must maintain a Local Domain Model (LDM), often derived from the Global Domain Model (GDM) on the backend. Manually designing an LDM that is consistent with the GDM requires handling nuanced dependencies, an error-prone task where oversight is easy. Objective: To address these challenges we aim to: (a) formally map dependencies between GDM and LDM; (b) analyze effort and errors when modelling without assistance; and (c) provide a semi-automated method leveraging these dependencies to significantly reduce both effort and errors. Method: To achieve these objectives, we propose a heuristic-based, step-by-step guided method. This approach leverages pre-existing GDM information to incrementally uncover dependencies and automate LDM construction as designers identify local behavior of GDM elements. We assessed this method's impact through an empirical experiment where we aimed to identify common mistakes and quantify effort during LDM construction. Expert UML modelers completed an LDM creation task both manually and with our tool-supported method. We recorded errors and cognitive effort to establish a baseline and measure impact. User perceptions were gathered via a survey; an analytical usability study based on GOMS complemented findings. Results: The proportion of users committing errors decreased by 77.8% with the tool, and the average error count per user was reduced by 97.3%. Time to complete the task decreased by 35.0% and interactive effort by 44.6%, consistent with GOMS predictions. Surveys showed majority positive responses across all items. Conclusions: Our approach effectively streamlines Local Domain Model creation. By automatically detecting dependencies and guiding designers, the tool drastically reduces error rates, cuts completion time, and lowers interaction volume. Expert users rated the method positively, affirming that benefits of guided, incremental LDM construction outweigh adoption effort., This work has been funded by the Government of the Principality of Asturias, with support from the European Regional Development Fund (ERDF) under project IDE/2024/000751 (GRU-GIC-24-070). Additional funding was provided by the University of Oviedo through its support for official research groups (PAPI-24-GR-REFLECTION).