Resultados de investigación

This paper presents the design and implementation of a photovoltaic energy harvesting system aimed at charging cement-based structural batteries, with the goal of enabling energy-autonomous infrastructures. The proposed architecture employs a tailored DC/DC power converter optimized for low-power, high-impedance energy storage devices embedded in concrete. The converter integrates Maximum Power Point Tracking (MPPT) algorithms to maximize energy extraction from the solar source. However, due to the unconventional electrochemical characteristics of cement-based batteries—namely, high and variable internal resistance, low charge acceptance, and pronounced self-discharge—standard MPPT operation may lead to overstress or inefficient charging. To address this, the control scheme dynamically limits MPPT operation based on real-time monitoring of the voltage across the terminals and the charge current, thus ensuring safe and adaptive energy transfer. The batteries used in the storage system are based on conductive concrete with iron chips and nickel galvanized steel electrodes. The monitoring of the battery status and the maximum power point tracking (MPPT) is based on a dsPIC33EV256GM102 low-cost microcontroller. Additionally, a monitoring system for operating conditions and processed energy is integrated, with data displayed using an ESP32 SoC circuit and a mobile application. The system demonstrates stable and effective power delivery under variable irradiance conditions, confirming its suitability for long-term deployment in smart civil infrastructure © 2017 Elsevier Inc. All rights reserved.

A completely chemo- and regioselective synthesis of pyrimidin-4(3H)-ones by reaction between 4,5-dihydro-1,2,4-oxadiazoles and chromium alkoxy alkynyl Fischer carbene complexes is reported. Overall, it is a formal (3+3)-cycloaddition where 4,5-dihydro-1,2,4-oxadiazoles partake for the first time in the intermolecular formation of 6-membered heterocycles. Three points of diversity have been explored, and usually, synthetically useful isolated yields are reached, including one example at gram-scale. A reasonable mechanism, supported by DFT calculations, is proposed., - Ministerio de Ciencia, Innovación y Universidades of Spain (Agencia Estatal de Investigación: PID2022-140635NB-I00, PID2019-107580GB-I00/AEI/10.13039/501100011033) - Agencia de Ciencia, Competitividad Empresarial e Innovacion Asturiana –SEKUENS – (SEK-25-GRU-GIC-24-030). - MCIU predoctoral FPI contract to S. S.-A.

Spanish Ministry of Economy and Competitiveness (MINECO), Spanish Ministry of Science and Innovation (MICINN) respectively and Asturias Regional Government.

Se adjuntan los datos correspondientes a la publicación Journal of Catalysis 457 (2026) 116797, The authors would like to acknowledge PID2020-112587RB I100, BIOHYDROMER and PID2023-147180OB-I100, VALPIROCAT funded by MCIN/AEI/ 10.13039/501100011033 for financing this work. I.P acknowledges the Spanish Ministry of Universities by the predoctoral grant FPU22/00362.

Partiendo de la base de que el poder se construye, sobre todo, en la comunicación (Castells, 2009), se evidencia la importancia de la capacidad comunicativa. Dicho de otra manera: Comunicación es poder. No en vano, las grandes empresas y los gobiernos invierten muchos esfuerzos en su capacidad de comunicación. Al mismo tiempo, la competencia comunicativa a un nivel individual es un prerrequisito básico para la participación en los procesos de la sociedad, ya que permite a los individuos desarrollarse profesionalmente, integrarse socialmente y, por ende, lograr una realización personal más satisfactoria. Debido a la creciente globalización y digitalización tanto de la vida cotidiana como del mundo laboral, las fronteras entre países se desdibujan, las distancias se acortan y los procesos se internacionalizan. Por lo tanto, la comunicación debe ser también internacional, lo que implica la necesidad de aprender lenguas extranjeras y poder comunicarse en ellas. La competencia comunicativa en una o varias len-guas se convierte así en un requisito fundamental para la ciudadanía. Estos cambios socioeconómicas y las exigencias resultantes también se han registrado en el ámbito de la didáctica de las lenguas extranjeras y han contribuido a un cambio de paradigma, en el sentido de favorecer cada vez más el desarrollo de las diversas competencias, entre ellas la competencia comunicativa (Villa y Poblete, 2010). En este contexto, el principal objetivo del presente trabajo es investigar empíricamente el potencial que ofrece el aprendizaje mediante la comunicación en un entorno tándem para el desarrollo de competencias lingüísticas generales.

Se presenta el primer protocolo inducido por luz visible para la preparación general de tiocianatos alquenilos a partir de bromuros alquenilos. La reacción es simple, se lleva a cabo bajo condiciones muy suaves y demuestra una amplia tolerancia a grupos funcionales. Además, se desarrolló un protocolo en flujo para permitir una ampliación eficiente de la síntesis de tiocianatos alquenilos, mejorando aún más la practicidad y el valor del método. Es importante destacar que estos tiocianatos alquenilos sirven como valiosos bloques de construcción para la construcción de diversas familias de moléculas que contienen azufre a través de trifluorometilaciones, cicloadiciones, oxidaciones y reacciones de formación de enlaces C–S o P–S., Se agradece sinceramente la beca predoctoral “Severo Ochoa” (BP21/050) concedida a H. F. P. por FICYT (Principado de Asturias) y la beca postdoctoral “Ramón y Cajal” concedida a M. P. (MCINN-24-RYC2022-035485-I) por el Ministerio de Ciencia e Innovación de España (Agencia Estatal de Investigación). También se agradece el apoyo financiero de este trabajo por parte del Ministerio de Ciencia e Innovación de España (Agencia Estatal de Investigación: MCINN-23-PID2022-140635NB-I00/MCIN/AEI/10.13039/501100011033/FEDER, UE) y la Universidad de Oviedo (PAPI-23-GR-COM-04).

Data from the article "M. Garcia, F. Ortin, J. Quiroga. An Infrastructure to Deliver Synchronous Remote Programming Labs. Transactions on Learning Technologies, Volume 14(2), pp. 161-172, 2021. https://doi.org/10.1109/TLT.2021.3063298", With the abrupt nationwide lockdown caused by the COVID-19 pandemic, many universities suspended face-to-face activities. Some of them decided to continue their academic courses, adapting traditional approaches to online learning. An important challenge was to deliver programming labs over the Internet without important methodological changes, which might imply modifications of the learning outcomes. Most of the existing approaches to remote programming labs are based on asynchronous learning, where students work autonomously and contact the lecturers if they have any issues. The existing systems to provide synchronous programming labs are restricted to a single programming language or application type, and show significant interaction limitations. Therefore, we defined an infrastructure that allowed us to deliver synchronous programming labs over the Internet during the COVID-19 lockdown, as we used to do face-to-face. After using it for both programming labs and exams, students showed a high level of satisfaction. Compared to previous years, the use of our system produced no statistically significant difference in student's grades, pass and fail rates, or the number of students taking the lab exam. The network bandwidth, CPU, and memory resources consumed are sufficiently low to have allowed all the students to use it without any issues. Regardless of the pedagogical and methodological approach selected, our infrastructure provides the synchronous and remote delivery of programming labs, similar to the original face-to-face approach. Its features make it appropriate to deliver synchronous remote classes where strong lecturer-student interaction is required, and all the student work can be done with their computers., This work has been partially funded by the Spanish Department of Science, Innovation and Universities: project RTI2018-099235-B-I00. The authors have also received funds from the University of Oviedo through its support of official research groups (GR-2011-0040).

This work was supported by Projects (1) “Caracterización y predicción de la generación aerodinámica de ruido en perfiles de turbinas eólicas”, DPI2011-25419, provided by the Spanish Ministry of Economy and Competitiveness; (2) “Desarrollo y construcción de turbinas eólicas de eje vertical para entornos urbanos”, ENE2017-89965-P, from the Spanish Ministry of Economy and Business, as well as by both “Severo Ochoa” predoctoral research scholarship provided by the Principality of Asturias.

Simulation results obtained from CFD (Computer Fluid Dynamics) calculations associated with the aforementioned ORP authored by Alvaro Pardo-Vigil, Adrián Pandal, Raúl Barrio-Perotti and José González Pérez. Alvaro Pardo-Vigil, Adrián Pandal and José González Pérez are members of the FERES Research Group in the University of Oviedo. These datasets are protected under Creative Commons License: CC BY-NC-SA., Alvaro Pardo-Vigil is supported by the Spanish Ministry of Science, Innovation and Universities within the “FPU” Program (grant reference FPU23/03450). The authors wish to thank the financial support of the Spanish Ministry of Science, Innovation and Universities in reference to the MERTURB project, ref. MCINN-22-TED2021–131307B-I00. Additional funding is provided by Agencia de Ciencia, Competitividad Empresarial e Innovación Asturiana (Sekuens) within "Subvenciones a Grupos de Investigacion de Organismos Públicos de I+D+I del Principado de Asturias, Convocatoria 2024" (grant reference IDE/2024/000724).

Supplementary information for the article "Photochemical carboborylation and three- component difunctionalization of a,b-unsaturated ketones with boronic acids via tosylhydrazones" Chemical Science: DOI: 10.1039/d4sc06537. The data are contained in a word .docx file with the chemdraw and NMR data embebed. NMR data in mestrenova format can be retrieved from the file. NMR data for each compound in Bruker format., Supplementary information for the article "Photochemical carboborylation and three- component difunctionalization of a,b-unsaturated ketones with boronic acids via tosylhydrazones" Chemical Science: DOI: 10.1039/d4sc06537. The ChemDraw structures and the NMR data are embebed in the .docx file. NMR data can be retrieved in mestrenova format., Financial support of this work by Ministerio de Ciencia e Innovación of Spain (Agencia Estatal de Investigación: grant MCINN-23-PID2022-140635NB-I00 Financed by MCIN/AEI/ 10.13039/501100011033/FEDER, UE). A FPI predoctoral contract to A.V.-M. (MCINN-24-PREP2022-000214) and a “Ramón y Cajal” postdoctoral grant to M. P. (MCINN-24-RYC2022-035485-I) by Ministerio de Ciencia e Innovación of Spain (Agencia Estatal de Investigación) are gratefully acknowledged