Resultados de investigación

Base de datos con información mensual y anual de pescado comercializado en las diferentes lonjas de Catalunya, Comunitat Valenciana, Murcia, Baleares y Andalucía. Datos mensuales de cantidad, precio medio y valor total por especie ., Esta base de datos se ha realizado a través del proyecto Digitalización y valorización de la pesca en el Mediterráneo español (DIGIPESCA,) financiado por el Ministerio de Agricultura, Pesca y Alimentación a través de los fondos NextGeneration UE.

This dataset is about the experimental results obtained and published in the article "Experimental Study of the Parameter Mismatch Effects on the Low Frequency Circulating Currents of Parallel Three Phase Inverters":Liberos, M.; González-Medina, R.; Patrao, I.; Torán, E.; Garcerá, G.; Figueres, E. Eng 2023, 4, 1356-1376. DOI: 10.3390/eng4020079 When converters are connected in parallel, a system with some benefits, including modularity and redundancy, is obtained. However, in these circumstances, circulating currents can appear that produce some adverse effects. In this work, a study of the low-frequency circulating currents that appear in three-phase inverters connected in parallel is performed. The study is focused on the effects produced by the parameter mismatch, namely inductance mismatches, power imbalance, and the use of different pulse with modulation (PWM) techniques. The nature of the circulating current produced by each of these factors were analyzed separately. Both simulation and experimental results are shown, which were obtained using a three-phase 10-kW prototype composed of two 5-kW inverters connected in parallel

Dataset of Tie and Tag: A Study of Tie Strength and Tags for Photo Sharing

[EN] Manipulative experiments were conducted to evaluate size preferences and maximum biomass consumption of the invasive blue crab (Callinectes sapidus) by two native Mediterranean predators: the common octopus (Octopus vulgaris) and the loggerhead sea turtle (Caretta caretta).

[EN] The data set contains the input/output data that was entered into the mathematical model to develop the case study. The data is synthetically generated and developed with an algorithm encoded in Python 3.7, the parameters for programming the algorithm are based on real data from a company in the automotive sector and the values have been structured according to the indices defined in the model. Input/output data details have been added to make the model replicable., This work was supported by the Conselleria de Educación, Investigación, Cultura y Deporte - Generalitat Valenciana for hiring predoctoral research staff with Grant (ACIF/2018/170) and European Social Fund with Grant Operational Program of FSE 2014-2020, the Valencian Community, and the authors would like to acknowledge the support of the researchers participating in the collaborative projects ‘Cloud Collaborative Manufacturing Networks’ (C2NET) (http://c2net-project.eu/), which has received funding from the EU Horizon 2020 Research and Innovation Programme with grant agreement No. 636909. “Zero Defects Manufacturing Platform” (ZDMP) (www.zdmp.eu) which has received funding from the EU Horizon 2020 Research and Innovation Programme with grant agreement No. 825631

Encuesta realizada a los pescadores en los puertos del Mediterráneo español., This work was supported by the National Plan for Scientific and Technological Research and Innovation (Spanish Economy and Competitiveness Ministry), the Research Project PID2019-105497 GB-I00, the European Fisheries Funds, opportunities for the fisheries sector through diversification, and the FLAGs management (DivPesc).

Active Power Filters (APF) for reducing current harmonic distortion have been widely used in both grids and microgrids. This work proposes a topology for an APF consisting of two Voltage Source Inverters (VSIs) connected in parallel to the same DC-link, which saves space and reduces cost compared to independent APFs. One inverter operates at a low switching frequency and compensates for low-order harmonics. The second inverter operates at a high switching frequency to target high-frequency harmonics. As the high-frequency inverter handles only around 25% of the total RMS current managed by the overall APF, switching losses are significantly reduced. However, connecting inverters in parallel produces circulating currents that can have an adverse effect on the system. In this work, circulating currents are cancelled by controlling the zero-sequence component of the currents in the two inverters.

[EN] This dataset presents data for electrospun membranes developed for controlled drug release applications. Both uniaxial Polyvinyl alcohol (PVA) and coaxial fibers with a PVA core and a poly (L-lactic acid) (PLLA) and polycaprolactone (PCL) coating were produced with different coating structures. The best conditions for the manufacture of the fibers were also studied and their morphology was analyzed as a function of the electrospinning parameters. Special attention was paid to the fiber surface morphology of the coaxial fibers, obtaining both porous and non-porous coatings. Bovine serum albumin (BSA) was used as the model protein for the drug release studies and, as expected, the uncoated fibers were determined to have the fastest release kinetics. Different release rates were obtained for the coated fibers, which makes this drug release system suitable for different applica-tions according to the release time required., This research was funded by MCIN/AEI/10.13039/501100011033 grant number PID2020-114894RB-I00.

La precisa determinación de la fuerza de pretensado residual es esencial para evaluar estructuras de hormigón pretensado existentes (EHPEs), pues el efecto del pretensado repercute sobremanera en su respuesta y capacidad tenso-deformacional. En el diseño del pretensado, el proyectista fija la fuerza de tesado y realiza una estimación de pérdidas de pretensado, para que la estructura cumpla con sus requisitos en toda su vida útil. Toda vez que la práctica constructiva no contempla la incorporación de dispositivos de medida en las EHPEs para su monitorización, las pérdidas de pretensado no suelen conocerse, y por ende tampoco la fuerza de pretensado residual, existiendo una gran incertidumbre para abordar la evaluación del extenso parque de EHPEs, que ha consumido buena parte de su vida útil, y de ahí la necesidad de avanzar en el método científico y el conocimiento de vanguardia en este ámbito. Pese a tales incertidumbres, son pocos los métodos empíricos disponibles, ya sean destructivos o no destructivos. El más reciente es el Método del Bloque de Hormigón Aislado (MEBHA), basado en la descompresión local del hormigón mediante la realización de cortes superficiales, y del que sólo se conocen dos aplicaciones pioneras, sin control directo de la fuerza de pretensado. Por ello, resulta del máximo interés investigar sobre su aplicación con monitorización de la fuerza de pretensado, con la finalidad de conocer la sensibilidad frente a parámetros como separación entre cortes, profundidad de corte y nivel tensional liberado. El Proyecto, motivado por la necesidad de formular diagnósticos fiables en la evaluación de EHPEs, en un contexto de vacío normativo que obliga a avanzar en la frontera del conocimiento, tiene como objetivo implementar una metodología específica para el diagnóstico del estado tenso-deformacional residual, y se fundamenta en la potencial sinergia del MEBHA como base empírica y una estrategia de modelización estructural multinivel acorde con las últimas tendencias. Tras la puesta a punto del MEBHA, se procederá a su aplicación en vigas partiendo de una colección de diseños resultantes de diferentes combinaciones de resistencia del hormigón, fuerza y excentricidad del pretensado, canto seccional y distribución de armadura transversal. Con un plan desglosado en diez tareas, se seguirá una metodología de trabajo que integrará las facetas de diseño/modelización y experimentación, de modo que exista una retroalimentación casi continua entre ambas. El MEBHA, que presenta un claro potencial para constituirse como un método no destructivo de referencia, práctico, económico y fiable, potenciará un planteamiento activo de mantenimiento de las EHPEs, y a su vez se concretarán especificaciones sobre cómo realizar análisis estructurales con distintos grados de refinamiento de la modelización, lo que redundará en una mayor probabilidad de evitar evaluaciones demasiado conservadoras y de incurrir en costos innecesarios derivados de las decisiones adoptadas tras la evaluación. El desarrollo de modelos de predicción y de herramientas de modelización para la evaluación estructural a partir de su estado tensodeformacional residual, junto con la elaboración de guías de aplicación del MEBHA, serán aspectos clave de cara a revisar métodos de diseño de estimación de pérdidas de pretensado., This work forms part of the Project “Looking for the lost prestress: multilevel strategy and non destructive method for diagnosis of existing concrete structures” funded by the Agencia Estatal de Investigación (State Research Agency) of Spain (competitive research project PID2020 118495RB I00 / AEI / 10.13039/501100011033 and human resources funding PRE2021 098777 / AEI / 10.13039/501100011033). The authors would also like to thank the ICITECH technical staff, Francisco J. Martorell Romero and Daniel Tasquer Val, for their valuable contributions and involvement in the development of the experimental work.

A theoretical analysis of a three-phase grid-connected B4 photovoltaic inverter was carried out, including modeling, control design, and stability assessment of the current and voltage control loops. The influence of photovoltaic voltage and grid inductance variations was analyzed through a parametric stability study. Finally, simulation-based evaluations were performed under ideal and distorted grid conditions to assess harmonic behavior, DC bus voltage ripple, and overall system performance., Funded by the Ministerio de Ciencia e Innovacion of Spain and the European Regional Development Fund (ERDF) under Grant RTI2018-100732-B-C21-AR. Funded by the Ministerio de Ciencia e Innovacion of Spain and the European Regional Development Fund (ERDF) under Grant PID2021-122835OB-C22.