Resultados de investigación

[EN] The production of Penaeus vannamei faces multiple challenges, from environmental constraints and disease outbreaks to the need for sustainable and improved farming practices, essential for responsible production. Biofloc technology offers a sustainable approach by enhancing water quality and serving as a complementary nutritional source. However, protein requirements in biofloc-based shrimp culture systems remain insufficiently defined despite their economic relevance. This study aimed to optimize dietary protein levels and feeding regimes for P. vannamei cultured under biofloc technology, while assessing the nutritional contribution of bioflocs through stable isotope analysis. A two-phase factorial experiment was conducted. In the juvenile stage, five diets containing 30–46% crude protein (CP) were tested under three feeding regimes (70, 85, and 100% of average daily ration). Shrimp fed 38% CP at 70% feeding achieved growth comparable to higher CP and feeding levels, indicating this combination as optimal for juveniles. In the grow-out phase, shrimp were fed 34–42% CP diets at a fixed 70% feeding rate. Growth performance, nutrient composition, and isotopic signatures (δ¹³C and δ¹⁵N) were evaluated to estimate carbon and nitrogen assimilation from feed and biofloc sources. Growth was maintained even at 34% CP, suggesting lower protein requirements for larger shrimp. Stable isotope analysis confirmed that biofloc contributed significantly to nitrogen and carbon assimilation, especially under reduced dietary protein. Results also demonstrate that a permanent 70% feeding strategy sustained shrimp performance under biofloc conditions. This outcome underscores the role of biofloc as a nutritional supplement, contributing to a more sustainable and cost-effective shrimp farming., This work was supported by I + D + i Research Project: “Optimizing shrimp feeding and nutrition in biofloc system (BioFlango)” (PID2020-114574RB-C21), and the Research Personnel Training Grant (PRE2021-098367); supported by MCIN/AEI/https://doi.org/10.13039/501100011033/. Additionally, J. Gómez-Aguilera contract was supported by European Union Next Generation-Plan of Conselleria d’innovació, Universitats, Ciència i Societat Digital of Generalitat Valenciana (INVEST/2022/434). Funding for open access charge: Universitat Politècnica de València.

Quality of life indicators include measures of both objective and subjective well-being to broaden the traditional income-focused view towards a multidimensional view of welfare. In this paper, we develop a single reliable composite index that considers the effect of uncertainty and imprecision related to the specific nature of the phenomenon being measured. Additionally, we suggest a procedure for incorporating this new way of assigning priorities through multicriteria techniques. To this end, we propose a new multicriteria approach that introduces the recent notion of picture fuzzy sets to deal with uncertainty and imprecision in the assessment of objective and subjective dimensions of quality-of-life performance. To verify the effectiveness of the whole approach and the credibility of the results, we show its application for monitoring the quality of life in the European Union. Our results show that fuzzy numbers can be a useful tool when combined with multicriteria techniques in the prioritization phase of the criteria and that they increase the quality and reliability of the overall aggregate indicator. Moreover, we find that in a picture environment, the results are consistent regardless of the multicriteria approach used to provide a final ranking.

[EN] This study examines the degradation of atrazine (ATZ) with Pt-modified textile electrodes using an electrochemical method that is comparatively studied in two electrochemical cell configurations: cells with separated anodic and cathodic compartments (divided configuration); and without any separation (undivided configuration). The influence of the presence of chloride ions was studied. The best results were obtained when an undivided cell was used. The morphology and composition of the dispersed Pt coatings were analyzed using field emission scanning electron microscopy (FESEM) and Energy Dispersive X-Ray Analysis. The FESEM analyses confirmed that the textile surface was effectively modified by the electrocatalytic material. High performance liquid chromatography, gas chromatography mass spectrometry, and spectroscopic methods were used to follow the evolution of major oxidation products. Total organic carbon, chemical oxygen demand, and total nitrogen were used to evaluate the degradation efficiency of treated aqueous solutions. The experimental results obtained indicate that the efficiency of the electrochemical treatment was high with a low energy consumption when using electrodes based on textile materials, such as anodes or as cathodes (in particular, in electrolysis without compartment separation). All these can be produced at very competitive prices., Chemviron Carbon who kindly donated the FlexzorbTM FM10 activated carbon fabrics and Funding for open access charge, CRUE-Universitat Politècnica de València, are acknowledged.

The Bezold effect, known by the influence of the shape and size of surrounding objects on the color appearance of a stimulus, has been studied by numerous authors. Situations have been studied in which the color stimulus is superimposed on an achromatic grating consisting of black and white lines arranged alternately with different spatial frequencies. The aim of the work is to determine whether the orientation of the grating lines (horizontal or vertical) induces a significantly different color appearance variation for different grating frequencies. A set of observers with normal color vision evaluated the variations in the color appearance of three light stimuli when superimposed on the same grating arranged horizontally and vertically, according to a procedure described by the authors in a previously published paper. The results show that the samples observed on the horizontal pattern present a Bezold effect significantly higher than those obtained when the samples are observed on the vertical pattern.

[EN] This dataset comprises the experimental measurements acquired using a versatile 7 kW inverter prototype configurable as B4 and B6, tested under grid-connected operation in a laboratory microgrid setup. The data support the comparative evaluation of both topologies in terms of efficiency, line-current total harmonic distortion (THD), and current unbalance, among other performance indicators reported in the associated publication. Associated publication: Torán, E.; Liberos, M.; Patrao, I.; González-Medina, R.; Garcerá, G.; Figueres, E. Performance Evaluation of the B4 Topology for Implementing Grid-Connected Inverters in Microgrids. Electronics 2024, 13(9), 1755. DOI: 10.3390/electronics13091755., Project REMOTEWEAK, Mejora de la calidad de potencia en sistemas de potencia remotos con conexión a red débil y elevada penetración de convertidores electrónicos de potencia, funded by the Spanish Ministerio de Ciencia e Innovación and the European Regional Development Fund (ERDF) under Grant PID2021-122835OB-C22.

Ti-felt anodes, with high surface area, have been used as supports of Pt and SnO2-Sb-Pt electrocatalysts. Anodes have been applied in a filter-press electrochemical reactor for the electrooxidation of polystyrene nanoplastics (NPs) (100 mg·L-1). Two types of configurations have been used. In the first, the solution with NPs flows through the anode, taking advantage of its porosity (acting as a sort of membrane) to enhance the contact of NPs with the anode and the oxidative species generated. In the second configuration, the solution of NPs flows parallel to the anode, and the NPs flow parallel to it. Comparing both configurations at 25 mA·cm-2, for the Ti-Pt anode, the flow-through configuration decreases energy consumption by ~7-fold and treatment time by ~15-fold when compared to the flow-by configuration. For Ti-SnO2-Sb-Pt anode, ratios of ~6.5-fold and ~13-fold were obtained, respectively. Moreover, the effect of the current density (50, 25, 12.5, and 5 mA·cm-2) was studied. For the Ti-Pt electrode, a treatment time of only 40 minutes was achieved at a current density of 25 mA·cm-2 with the F-T configuration, with a faradaic efficiency of 62.09 %, and electrochemical energy per order (EEO) of 21.91 kW·h·m-3·order-1. In the case of the F-B configuration at 25 mA·cm-2 the treatment time increases until 600 min, with a faradaic efficiency of 8.27 % and EEO of 156.57 kW·h·m- 3·order-1., This research is part of the Spanish R+D+i contract TED2021-130905B-I00 funded by MCIN/AEI /10.13039/501100011033 and by the European Union NextGenerationEU/PRTR as well as the Red E3Tech Plus: Proyecto Redes de Investigación de la AEI Network E3Tech PLUS (RED2022-134552-T) project. Funding for open access charge: CRUE-Universitat Politècnica de València. The Electron Microscopy Service of the UPV (Universitat Politècnica de València) is gratefully acknowledged for its help with FESEM, EDX, TEM, and XRM characterization.

To enhance their corrosion protection, Guefoams were coated with RGO using both potentiostatic and potentiodynamic methods. The potentiodynamic method produced the thickest RGO coating and the lowest Cl, O, and Al content, as observed using FESEM and EDX. The Guefoams were exposed to a 3.5% NaCl solution and steam. The polarization resistance was examined, electro-chemical impedance spectroscopy was performed, and polarization curves were constructed to monitor the corrosion process. After 28 days, the Al concentrations in the solutions were meas-ured, and were found to be 145 mg/L (bare Guefoam), 70 mg/L (RGO-coated, potentiostatic), and 35 mg/L (RGO-coated, potentiodynamic). The potentiodynamic RGO coating also showed the best corrosion protection values., Thanks to the projects PDC2021-121617-C21 and PDC2021-121617-C22, funded by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. and Conselleria de Innovación, Universidades, Ciencia y Sociedad Digital (Generalitat Valenciana) (GVA-COVID19/2021/097).The Electron Microscopy Service of the UPV (Universitat Politècnica de València) is gratefully acknowledged for their help with the FESEM and EDX characterization.

Fishmeal (FM) reduction can improve shrimp feed sustainability, but low FM formulations remain insufficiently validated across production stages, scales, and post-harvest quality traits. This study evaluated alternative protein strategies for Penaeus vannamei reared under super-intensive biofloc technology (BFT) at different production scales. In a medium-scale grow-out trial, a Control diet containing 15% FM was compared with diets containing 7.5% FM using animal-derived proteins (A7.5) or combined animal- and plant-derived proteins (AP7.5). AP7.5 maintained growth and apparent feed conversion comparable to those of the Control diet, whereas A7.5 showed poorer performance. Post-harvest quality was assessed in commercial-size shrimp during refrigerated storage without antimelanosis treatment. Sensory differences were limited shortly after harvest but became more evident during storage, with AP7.5 maintaining a comparatively stable sensory profile and showing lower panel-assessed melanosis after seven days. Subsequently, the AP7.5 diet was validated against the Control in a pilot large-scale trial covering the juvenile and grow-out phases, maintaining comparable growth, economic conversion ratio, and profitability index. Sensitivity analysis further showed that its relative economic performance was maintained across simulated FM and shrimp price scenarios and became more favorable as FM prices increased. In conclusion, the consistent productive and economic performance of AP7.5 across production stages and scales, together with maintained sensory quality and lower panel-assessed melanosis, supports its potential as a scalable low-FM strategy for BFT shrimp production., This work was supported by the I+D+i Research Project “Optimizing Shrimp Feeding and Nutrition in Biofloc Systems (BioFlango)” (PID2020-114574RB-C21) and by a predoctoral Research Personnel Training Grant awarded to S. Ferrando-Juan (PRE2021-098367), both funded by MCIN/AEI/10.13039/501100011033. Additionally, J. Gomez-Aguilera’s contract was supported by the European Union Next-Generation Plan of Conselleria d’Innovació, Universitats, Ciència i Societat Digital of Generalitat Valenciana (INVEST/2022/434).

This repository contains four Excel 2017 files named “APD.xlsx”, “QT.xlsx”, “Tx_APD.xlsx” and “Tx_QT.xlsx”. APD.xlsx and Tx_APD.xlsx files contain three sheets (called “Epi”, “Mid” and “Endo”), whereas the rest contain only one sheet (called “QT”). These files contain the results of simulations performed in the O’Hara-Rudy model (ORd) [1] of human ventricular cells (206.766 simulations) and tissue (7072 simulations), which consist of APD90 and QT intervals as well as a new index called Tx extracted from both APD and QT values. References: [1]. O’Hara, T.; Virág, L.; Varró, A.; Rudy, Y. Simulation of the Undiseased Human Cardiac Ventricular Action Potential: Model Formulation and Experimental Validation. PLoS Comput. Biol. 2011, 7 (5), e1002061. [2]. Romero L., Cano J., Gomis-Tena J., Trenor B., Sanz F., Pastor M., Saiz J. In silico QT and APD Prolongation Assay for Early Screening of Drug-Induced Proarrhythmic Risk. Journal of Chemical Information and Modeling. 2017 (Currently in revision).

This dataset contains the experimental data generated during the evaluation of different materials as potential barriers against radon released from phosphogypsum. It includes the raw radon concentration measurements recorded in the source and receiver chambers during 148.5-hour tests, the main specifications of the experimental set-up used to perform the measurements, and the thickness measurements of the tested materials. The experimental data were used to determine the radon concentration reduction achieved by each material, as reported in the associated conference proceedings paper. The experimental data were generated using a two-chamber experimental set-up designed in accordance with ISO/TS 11665-13:2017 to evaluate the effectiveness of different materials as barriers against radon released from phosphogypsum. It consisted of two sealed AISI 316L stainless steel chambers (2 mm thickness, 0.801 L volume and 78.5 cm² test area) separated by the test sample. Phosphogypsum with an activity of 2.29 Bq was placed inside the source chamber, while the receiver chamber collected the radon that permeated through the sample. Radon concentration in both chambers was continuously monitored using two Durridge RAD7 detectors. Ten different materials were evaluated. Each test lasted 148.5 hours, during which radon concentrations in the source and receiver chambers were recorded at 1.5 hour intervals. These raw experimental data were used to determine the percentage reduction in radon concentration achieved by each material. The radon concentration data recorded by the RAD7 detectors at 1.5 hour intervals were exported. For each experiment, the dataset includes the test date and the radon concentration values measured in the source and receiver chambers throughout the 148.5 hour test. No additional processing was applied to the concentration data. The experimental set-up specifications were compiled. For the thickness data, the reported mean thickness and standard deviation were calculated from eight thickness measurements taken at different locations on each material. The dataset also includes the main specifications of the experimental set-up, such as chamber characteristics, phosphogypsum activity and test area. The thickness of each material was determined from eight measurements taken at different locations, from which the mean thickness and the standard deviation were calculated.