PathFinder: A Visualization eMathTeacher for Actively Learning Dijstra's algorithm

PathFinder is a new eMathTeacher for actively learning Dijkstra's algorithm. In Sanchez-Torrubia et al. (2007) the concept of eMathTeacher was defined and the minimum as well as some additional requirements were described. The tool presented here is an enhanced paradigm of this new concept on Computer Aided Instruction (CAI) resources: an application designed following the eMathTeacher philosophy for active eLearning. The highlighting new feature provided by this application is an animated algorithm visualization panel showing, on the code, the current step the student is executing and/or where there is a user's mistake within the algorithm running. PathFinder also includes another two interesting new features: an active framework area for the algorithm data and the capability of saving/retrieving the created graph

Self-assembly and properties of a discrete water-soluble Prussian blue analogue FeII/CoIII cube: confinement of a water molecule in aqueous solution

Novel types of water-soluble anionic cubic cages, K4[{CoIII(Me3-Tacn)}4{FeII(CN)6}4] and Na4[{CoIII(Me3-Tacn)}4{FeII(CN)6}4] (Me3-Tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane), were prepared by means of a mechanistically designed self-assembly process between [Co(Me3-Tacn)Cl3] and A4[FeII(CN)6] (M = Na or K), consisting of a rate-limiting outer-sphere redox step, followed by a fast substitution/inner-sphere redox reaction sequence. These compounds show remarkable stability in aqueous solution at different pH ranges, displaying neat protonation processes and reversible oxidation with peroxodisulfate to its neutral {FeIII4CoIII4} form. Furthermore, the cages behave as a robust and water-soluble molecular Prussian Blue analogue capable of encapsulating {Na-OH2}+ pairs and K+ cations in aqueous solution, with the cubic structure of the complex being preserved. Substitution of the {Na-OH2}+ pairs by K+ is easily accomplished, and the electrochemical properties of the sodium and potassium salts of the new cages have been found to be dramatically dependent on the encapsulated units

A high-performance IoT solution to reduce frost damages in stone fruits

[EN] Agriculture is one of the key sectors where technology is opening new opportunities to break up the market. The Internet of Things (IoT) could reduce the production costs and increase the product quality by providing intelligence services via IoT analytics. However, the hard weather conditions and the lack of connectivity in this field limit the successful deployment of such services as they require both, ie, fully connected infrastructures and highly computational resources. Edge computing has emerged as a solution to bring computing power in close proximity to the sensors, providing energy savings, highly responsive web services, and the ability to mask transient cloud outages. In this paper, we propose an IoT monitoring system to activate anti-frost techniques to avoid crop loss, by defining two intelligent services to detect outliers caused by the sensor errors. The former is a nearest neighbor technique and the latter is the k-means algorithm, which provides better quality results but it increases the computational cost. Cloud versus edge computing approaches are analyzed by targeting two different low-power GPUs. Our experimental results show that cloud-based approaches provides highest performance in general but edge computing is a compelling alternative to mask transient cloud outages and provide highly responsive data analytic services in technologically hostile environments.This work was partially supported by the Fundación Séneca del Centro de Coordinación de la Investigación de la Región de Murcia under Project 20813/PI/18, and by Spanish Ministry of Science, Innovation and Universities under grants TIN2016-78799-P (AEI/FEDER, UE) and RTC-2017-6389-5. Finally, we thank the farmers for the availability of their resources to be able to asses and improve the IoT monitoring system proposed.Guillén-Navarro, MA.; Martínez-España, R.; López, B.; Cecilia-Canales, JM. (2021). A high-performance IoT solution to reduce frost damages in stone fruits. Concurrency and Computation: Practice and Experience (Online). 33(2):1-14. https://doi.org/10.1002/cpe.529911433

Teaching Materials for Active Methodologies in University Education

In the present university educational model, teaching is less teacher-centered (instruction) and more student-centered (learning). In this context, it is essential to have adequate teaching materials to support the student, both in the learning process and in the evaluation stage of the subjects. Thus, the formative evaluation (it allows knowing the progress of the students, offering proposals for additional learning) becomes more important than merely summative evaluation (with the sole purpose of obtaining a grade). This article presents a teaching-learning proposal based on the experience accumulated by the authors over several years, in which different teaching innovations have been applied. These innovations were intended to facilitate learning, improve results, increase motivation, foster collaborative work and student involvement, among other objectives. It has been found that active methodologies improve learning results through student motivation and involvement. For their part, teaching materials play a fundamental role in guiding and orienting the students’ autonomous learning process and, at the same time, facilitating collaborative and participatory dynamics in the classroom

Fish oil substitution by soybean oil in Diplodus puntazzo: Performance fatty acid profile and liver histology

[EN] The present study was performed to determine the effect of soybean oil on the performance and liver histology in sharpsnout sea bream. Four experimental diets were formulated containing 0%, 25%, 50% and 75% of soybean oil substituting of fish oil. Fish weighing 35 g were fed for 84 days. Increasing the level of soybean oil had no significant effects on growth and feed efficiency parameters. Biometrics, body composition, protein- and energy- efficiency were not affected by the fish oil replacement. Muscle and liver fatty acids reflected fish oil substitution. Moreover, histology did not show statistical differences among treatments.This research was supported by grants from the Planes Nacionales de Acuicultura (JACUMAR) in Spain.Nogales Mérida, S.; Martínez-Llorens, S.; Moñino López, AV.; Jover Cerda, M.; Tomas-Vidal, A. (2017). Fish oil substitution by soybean oil in Diplodus puntazzo: Performance fatty acid profile and liver histology. Journal of Applied Aquaculture. 29(1):46-61. doi:10.1080/10454438.2016.1274933S4661291Association of Official Analytical Chemists (AOAC). 1990. Official methods of analysis, 15th ed., p. 1298. Arlington, VA: Author.Caballero, M. J., Izquierdo, M. S., Kjorsvik, E., Fernandez, A. J., & Rosenlund, G. (2004). Histological alterations in the liver of sea bream, Sparus aurata L., caused by short- or long-term feeding with vegetable oils. Recovery of normal morphology after feeding fish oil as the sole lipid source. Journal of Fish Diseases, 27(9), 531-541. doi:10.1111/j.1365-2761.2004.00572.xCaballero, M. ., Obach, A., Rosenlund, G., Montero, D., Gisvold, M., & Izquierdo, M. . (2002). Impact of different dietary lipid sources on growth, lipid digestibility, tissue fatty acid composition and histology of rainbow trout, Oncorhynchus mykiss. Aquaculture, 214(1-4), 253-271. doi:10.1016/s0044-8486(01)00852-3Glencross, B., Hawkins, W., & Curnow, J. (2003). Evaluation of canola oils as alternative lipid resources in diets for juvenile red seabream, Pagrus auratus. Aquaculture Nutrition, 9(5), 305-315. doi:10.1046/j.1365-2095.2003.00257.xGrisdale-Helland, B., Ruyter, B., Rosenlund, G., Obach, A., Helland, S. ., Sandberg, M. ., … Røsjø, C. (2002). Influence of high contents of dietary soybean oil on growth, feed utilization, tissue fatty acid composition, heart histology and standard oxygen consumption of Atlantic salmon (Salmo salar) raised at two temperatures. Aquaculture, 207(3-4), 311-329. doi:10.1016/s0044-8486(01)00743-8Izquierdo, M. S., Obach, A., Arantzamendi, L., Montero, D., Robaina, L., & Rosenlund, G. (2003). Dietary lipid sources for seabream and seabass: growth performance, tissue composition and flesh quality. Aquaculture Nutrition, 9(6), 397-407. doi:10.1046/j.1365-2095.2003.00270.x(2007). Aquaculture Research, 38(1). doi:10.1111/are.2007.38.issue-1Martino, R. C., Cyrino, J. E. P., Portz, L., & Trugo, L. C. (2002). Performance and fatty acid composition of surubim (Pseudoplatystoma coruscans) fed diets with animal and plant lipids. Aquaculture, 209(1-4), 233-246. doi:10.1016/s0044-8486(01)00847-xMcFadzen, I. R. ., Coombs, S. ., & Halliday, N. . (1997). Histological indices of the nutritional condition of sardine, Sardina pilchardus (Walbaum) larvae off the north coast of Spain. Journal of Experimental Marine Biology and Ecology, 212(2), 239-258. doi:10.1016/s0022-0981(96)02755-4Nogales Mérida, S., Jover Cerdá, M., Martínez Llorens, S., & Tomás Vidal, A. (2011). A study of partial replacement of fish meal with sunflower meal on growth, amino acid retention, and body composition of sharpsnout seabream, Diplodus puntazzo (Actinopterygii: Perciformes: Sparidae). Acta Ichthyologica Et Piscatoria, 41(1), 47-54. doi:10.3750/aip2011.41.1.07Nogales-Mérida, S., Tomás-Vidal, A., Cerdá, M. J., & Martínez-Llorens, S. (2011). Growth performance, histological alterations and fatty acid profile in muscle and liver of sharp snout sea bream (Diplodus puntazzo) with partial replacement of fish oil by pork fat. Aquaculture International, 19(5), 917-929. doi:10.1007/s10499-010-9410-zNogales Mérida, S., Tomás-Vidal, A., Martínez-Llorens, S., & Jover Cerdá, M. (2010). Sunflower meal as a partial substitute in juvenile sharpsnout sea bream (Diplodus puntazzo) diets: Amino acid retention, gut and liver histology. Aquaculture, 298(3-4), 275-281. doi:10.1016/j.aquaculture.2009.10.025O’Fallon, J. V., Busboom, J. R., Nelson, M. L., & Gaskins, C. T. (2007). A direct method for fatty acid methyl ester synthesis: Application to wet meat tissues, oils, and feedstuffs. Journal of Animal Science, 85(6), 1511-1521. doi:10.2527/jas.2006-491Olsen, R. E., Tore Dragnes, B., Myklebust, R., & Ringø, E. (2003). Effect of soybean oil and soybean lecithin on intestinal lipid composition and lipid droplet accumulation of rainbow trout, Oncorhynchus mykiss Walbaum. Fish Physiology and Biochemistry, 29(3), 181-192. doi:10.1023/b:fish.0000045708.67760.43Peng, S., Chen, L., Qin, J. G., Hou, J., Yu, N., Long, Z., … Sun, X. (2008). Effects of replacement of dietary fish oil by soybean oil on growth performance and liver biochemical composition in juvenile black seabream, Acanthopagrus schlegeli. Aquaculture, 276(1-4), 154-161. doi:10.1016/j.aquaculture.2008.01.035Piedecausa, M. A., Mazón, M. J., García García, B., & Hernández, M. D. (2007). Effects of total replacement of fish oil by vegetable oils in the diets of sharpsnout seabream (Diplodus puntazzo). Aquaculture, 263(1-4), 211-219. doi:10.1016/j.aquaculture.2006.09.039Richard, N., Mourente, G., Kaushik, S., & Corraze, G. (2006). Replacement of a large portion of fish oil by vegetable oils does not affect lipogenesis, lipid transport and tissue lipid uptake in European seabass (Dicentrarchus labrax L.). Aquaculture, 261(3), 1077-1087. doi:10.1016/j.aquaculture.2006.07.021Roberts, R. J. 1981. Patología de los peces. In ed. M. Prensa, 366. Madrid, Spain.Ruyter, B., Moya-Falcón, C., Rosenlund, G., & Vegusdal, A. (2006). Fat content and morphology of liver and intestine of Atlantic salmon (Salmo salar): Effects of temperature and dietary soybean oil. Aquaculture, 252(2-4), 441-452. doi:10.1016/j.aquaculture.2005.07.014Snedecor, G., and W. Cochran. 1971. Statistical methods, p. 592. Ames, IA: Iowa State University Press.Turchini, G. M., Mentasti, T., Frøyland, L., Orban, E., Caprino, F., Moretti, V. M., & Valfré, F. (2003). Effects of alternative dietary lipid sources on performance, tissue chemical composition, mitochondrial fatty acid oxidation capabilities and sensory characteristics in brown trout (Salmo trutta L.). Aquaculture, 225(1-4), 251-267. doi:10.1016/s0044-8486(03)00294-1(2009). Reviews in Aquaculture, 1(1). doi:10.1111/raq.2009.1.issue-

Acute Effects of Muscular Fatigue on Vertical Jump Performance in Acrobatic Gymnasts, Evaluated by Instrumented Insoles: A Pilot Study

The study of fatigue during training is becoming a very useful tool to avoid possible injuries not only during the training sessions but also during recovery time. Many researches have proved that concepts such as muscular fatigue and postactivation potentiation have a close relationship. With this aim, vertical jump can provide a very important information that can help to analyze the muscular fatigue that happened during this type of activity, mainly if the monitoring system is able to measure jumping parameters during their regular training session in their natural training environment. This study was performed with instrumented insoles called ECnsole. These insoles were tested with a group of twelve volunteers. In a tumbling surface, the participants performed a jumping protocol in three conditions: rest, fatigue-induced, and recovery. Using these validated insoles, the acrobatic gymnasts showed an inability to use the stretch-shortening cycle for improving vertical jumping performance after fatigue condition, although no deterioration of jump performance was found.Junta de Andalucía European Commission P10-TIC5997European Commissio

El modelo semi-presencial y virtual a examen en el área de ingeniería

Durante los dos últimos cursos, la educación universitaria se ha visto obligada a cambiar de forma precipitada debido a la pandemia mundial que nos ha afectado. A pesar de los esfuerzos de las instituciones por adaptarse de una forma adecuada a un modelo semi-presencial o virtual a lo largo del curso, la percepción de los estudiantes no siempre corresponde con la que se pretende desde los organismos oficiales. En este estudio se ha realizado una encuesta voluntaria al alumnado de diferentes titulaciones de grado y másteres del área de ingeniería con el objetivo de someter a examen las medidas adoptadas por la Universidad de Granada (UGR) y comprobar si son aceptadas por los estudiantes y si, desde su punto de vista, se podrían mantener a largo plazo

Anthropometric Values in Spanish Elite Soccer: Differences between Divisions and Playing Positions

Body composition is an important factor in a soccer player’s performance, and anthropometry is one of the most widely used methods of measurement. The physical demands of Spanish soccer have evolved over time, so the ideal body composition requirements must be adapted to the present day. The aim of this study was to describe the anthropometric and body composition profiles of professional soccer players in the second, second B, and third divisions during the 2019–2020 season in order to compare the anthropometric parameters of players among positions and competitive divisions. A cross-sectional study was conducted to determine differences in kinanthropometric and derived variables in a sample of Spanish soccer players. A total of 615 soccer players from the second (116 players), second B (310 players), and third (189 players) divisions participated in this study. After comparing the groups according to the playing position and category, it was observed that at higher levels of play, soccer players show lower values of fat mass (FM) and higher values of muscle mass (MM) and bone mass (BM); at lower levels of play, soccer players show more anthropometric differences between playing positions. Lastly, the somatotype of the elite soccer player is balanced mesomorphic, with higher levels of mesomorphy at higher levels of play. In summary, this is the first study to evaluate the body composition of the different Spanish soccer divisions

Electrical activity of crystal defects in multicrystalline Si

Producción CientíficaUpgraded metallurgical-grade silicon solar cells with different ranges of efficiencies have been characterized by light-beam-induced current (LBIC) measurements. The interaction between grain boundaries and metallic impurities is studied for cells fabricated on wafers from different solidification heights of the ingot. A tight relation is observed between the electrical activity of the grain boundaries and the position of the wafer in the ingot, which is related to the impurity contamination. The presence of a large amount of metallic impurities enhances the electrical activity of the grain boundaries. The main features of the LBIC images are discussed in relation to the presence of metallic impurities.Junta de Castilla y León (project VA283P18)Ministerio de Economía, Industria y Competitividad (project ENE2017-89561-C4-3-R