Sostenibilidad energética a largo plazo. El papel de la fusión nuclear

En este artículo se realiza una disertación sobre la sostenibilidad energética y la contribución de las diferentes energías a ella, analizando con especial énfasis el papel que desempeña la fusión nuclear en el desarrollo sostenibl

La implementación de “Los Bubuskiski”; guía para educación primaria

66 páginas.Trabajo de Máster Oficial Interuniversitario en Comunicación y Educación Audiovisual (2022/23). Director: Dr. D. Walter Federico Gadea. Bubuskiski es un proyecto audiovisual protagonizado por once marionetas en el cual los niños/as aprenden a comunicarse a través de situaciones cotidianas y divertidas. Esta serie se compone de personajes animados, y a través de unos 10 minutos de capítulos se abordan temas relacionados con el uso de la pantalla, las TIC y la comunicación. La trama se enfoca en un aspecto determinado, y se desarrolla de una forma amena y divertida. En resumen, este proyecto representa una gran manera de mejorar la alfabetización mediática de los niños y niñas ayudando a este grupo a adquirir un amplio abanico de competencias digitales. Para obtener una mayor difusión de este proyecto realizamos este trabajo con el objetivo de emplear y desarrollar las virtudes y cualidades que nos proporciona esta serie en el ámbito de la Educación Primaria

De las teorías de la educación a distancia a la presencia actual del e-learning

Technology is increasingly present in our lives and inevitably conditions the way humans interact with each other. The introduction of ICT devices and the increasing interest in exploring academic horizons through online tools mean that education is evolving as society progresses, but to what extent should the Internet be a substitute for traditional methods? Questions such as this are addressed in this study, which takes distance education theories as a starting point, explores the implication of these educational theories on technology, and concludes in the present day by examining the COVID-19 pandemic and its consequences in this field

El efecto del cloruro de N-cetilpiridina sobre la absorción de un colorante reactivo sobre Leacril. Potencial zeta y termodinámica de absorción.

Se ha efectuado una investigación de tipo experimental sobre la absorción y potencial de flujo de Remazol Blue R (RBB-R) con fibras Leacril tratadas y sin tratar con 10^-3 M de cloruro de N-cetilpiridina (N-CP-CI). Los modelos de haces decapilares utilizados son los de Goring y Mason, Biefer y Mason, y Chang y Roberston. El comportamiento cualitativo del potencial zeta es similar en los tres modelos usados. El aumento observado del potencial zeta, en Leacril sin tratar, entre 10^-6 M y 10^-5 de RBB-R en solución se debe probablemente a las atracciones hidrofóbicas entre la fibra y la parte hidrofóbica del colorante. A concentraciones mayores a ca. 10^-5 de colorante, las reacciones químicas entre los grupos -NH2, y NH del colorante y el sulfato y los grupos de terminales de sulfato del Leacril podrían probablemente ser la causa de la disminución observada del potencial zeta en la gama de concentración mencionada. La cantidad de RBB-R absorbida en el Leacril sin tratar se ve favorecida por el aumento de la temperatura de adsorción. Se debe ello a los enlaces químicos implícitos en el proceso de absorción. Los valores del potencial zeta negativos, en fibra tratada, son más elevados que los valores del potencial zeta para fibras sin tratar en toda la gama de concentración ensayada en RBB-R. Este hecho viene a demostrar un aumento de la fortaleza de las interacciones entre la fibra de Leacril tratada y RBB-R. También se presentan datos sobre la cinética y termodinámica de absorción de Remazol Brillant Blue R, en fibras Leacril tratadas y sin tratar a diferentes temperaturas, habiéndose obtenido los valores de las constantes de velocidad de la reacción tiempo de media tintura y coeficientes de difusión del colorante en los mencionados procesos de absorción. De forma similar, se han obtenido los cambios de entalpia y entropía en relación con el proceso de tintura del Leacril. Los resultados ponen de manifiesto la presencia de fuertes enlaces químicos entre los sistemas, tratados y no tratados, de Leacril/Remazol Brilliant Blue.An experimental investigation on the streaming potential and sorption of Remazol Brilliant Blue R (RBB-R) on both wtreated and treated Leacril fibres with 10^-3 M of N-cetylpyridinium chloride (N-CP-CI) has been carried out. The models of bundle of capillaries employed in the determination of zeta potential of Leacril are the models of Goring and Mason, Biefer and Mason and Chang and Robertson. The qualitative behaviour of zeta potential is similar in the three models employed. The increasing of zeta potential observed, by untreated Leacril, between and 10^-5 M and ca. 10^-5 M of RBB-R in solution is probably due to the hydrophobic attractions between the fibre and the hydrophobic part of the dye. At concentrations higher than ca 10^-5 of dye, the chemical reactions between both -NH2, and the -NH groups of the dye and the sulphonate and sulfate end-groups of the Leacril, respectively, could possibly cause the observed decreasing in the zeta potential, at the mentioned concentration range. The amount of RBB-R absorbed on untreated Leacril is favoured by the increasing in adsorption temperature. This fact is due to the chemical bonds involved in the absorption process. The values of the negative zeta potential, by treated fibre, are higher than of zeta potential by untreated fibres in all the concentration range tested of RBB-R. This fact shows an increasing in the strength of the interactions between the treated Leacril fibre and the RBB-R. Data of the kinetics and thermodynamics of absorption of Remazol Brilliant Blue R on both untreated and treated Leacril at different temperatures are presented, obtaining both the values for the rate constant of the reaction, the half-dyeing time and the diffusion coefficients of the dye in the above processes of absorption. They have also been obtained the changes of enthalpy and entropy related to the process of dyeing of Leacril. Results reveal the presence of strong chemical bonds between both the untreated and treated Leacril/Remazol Brilliant Blue systems.Nous avons entrepis des recherches de type expérimentel sur l'absorption et le potentiel de flux de Remazol Blue R (RBB-R) avec des fibres Leacril traitées et non traitées avec 10^-3 M de chlorure de N-cétylpyridine (N-CP-CI). Les modèles de faisceaux capillaires utilisés sont ceux de Goring et Mason, Biefer et Mason, et Chang et Roberston. Le comportement qualitatif du potential zêta est similaire dans les trois modèles utilisés. L'augmentation observé du potentiel zêta, sur du Leacril non traité, entre 10^-6 M et 10^-5 de RBB-R en solution, est probablement dû aux attractions hydrophobiques entre la fibre et la partie hydrophobique du colorant. À des concentrations de colorant supérieures a 10^-5 ca, les reactions chimiques entre les groupes -NH, et NH du colorant et le sulfonate et les groupes terminaux de sulfate du Leacril pourraient probablement expliquer la diminution observée du potentiel zêta dans la gamme de concentration mentionnée. La quantité de RBB-R absorbée dans le leacril non traité est favorisée par l'augmentation de la température d'adsorption. Cela est dû aux liaisons chimiques implicites dans le processus d'absorption. Les valeurs négatives du potentiel zêta, pour la fibre traitée, sont supérieures aux valeurs du potentiel zêta pour des fibres non traitées dans toute la gamme de concentration testée en RBB-R. Ce fait démontre l'augmentation de la robustesse des interactions entre la fibre de Leacril traitée et RBB-R. Nous apportons aussi des données sur la cinétique et la thermodynamique d'absorption de Ramazol Brillant Blue R, sur des fibres Leacril traitées et non traitées, à différentes températures, puisque nous avons obtenu les valeurs des constantes de vitesse de la réaction temps de demi-teinture et des coefficients de diffusion du colorant dans les processus d'absorption cités. De même, nous avons obtenu les changements d'enthalpie et d'entropie par rapport au processus de teinture du Leacril. Les résultats mettent en évidence la présence de fortes liaisons chimiques entre les systèmes, traités et non traités, de Leacril/Remazol Brillant Blue.Peer Reviewe

Encuestas como herramienta para valorar la influencia de las innovaciones docentes en el rendimiento a largo plazo de los alumnos

Tratamos de desarrollar una herramienta docente de evaluación, que resulte útil para valorar como evoluciona la retención de los contenidos de nuestra asignatura en los alumnos así como la influencia que en esa memoria van teniendo las distintas innovaciones metodológicas que vamos introduciendo en nuestra docencia. Se diseñó un modelo de encuesta que realizaron 219 alumnos de los cursos tercero, cuarto y quinto de la Licenciatura de Odontología y se valoraron las respuestas obtenidas con ayuda de un programa de análisis estadístico. Este tipo de encuesta nos permite un control a largo plazo de nuestra docencia y su influencia en los conocimientos de nuestros alumnos. Además puede ser una herramienta muy útil para valorar la percepción que nuestros alumnos tienen de nuestra docencia y la utilidad de la misma a largo plazo.We endeavour to develop a tool to evaluate the influence upon our students’ long-term knowledge retention made by the various innovative methodologies being introduced into our teaching. A questionnaire is designed which is answered by 219 students from the third, fourth and fifth year of the dentistry degree and the results are assessed with the help of a statistical analysis program. This type of survey enables us to supervise our teaching and its influence upon the skill of our students. Furthermore, it can also prove to be useful as a tool for the evaluation of both the students’ perception of our teaching system and of its utility in the long-ter

Validation of the standard method EN ISO 19343:2017 for detection and quantification of histamine in different matrices of fish and fishery products using high performance liquid chromatography

Motivation: Histamine, a biogenic amine produced by bacterial decarboxylation of histidine, is the main cause of scombroid fish poisoning and is strictly regulated by the European Union in fish and fishery products [1]. Therefore, an adequate histamine quantification method is necessary in order to assess current regulations and prevent health problems. In this sense, High Performance Liquid Chromatography (HPLC) have been widely used for the detection of histamine as it provides good specificity and sensitivity when coupled with a highly sensitive detector. The standard protocol EN ISO 19343 is the current in use and it was developed to meet with 2073/2005 European Regulation about microbiological criteria for food products. However, there is still room for improvement in terms of resolution, sensitivity and discrimination and the validation of this protocol is a necessary step in laboratories to prove the reliability of results and a previous step to get ISO certification [2].Methods: In this study, we use the HPLC method-based ISO 19343:2017 to compare the results from different samples of raw fish, canned fish, fish sauce and fishery derived products. This method allows the separation of histamine within the set of biogenic amines from fish and fishery products. The sample is extracted by mixing it with perchloric acid. A derivatization is carried out prior passing through a chromatographic column using dansyl chloride to do histamine detectable under UV light. Biogenic amines and components in the solution are separated by HPLC using a chromatographic column, with UV detection. Histamine concentration is calculated from the ratio between the areas of histamine peaks and internal standard, using a calibration curve.In the validation process, veracity of the method is studied, examining parameters such as accuracy, recovery and correction. The work interval is defined between the lower and upper quantification limit. The specificity / selectivity of the method is studied and verified by performing exercises in different matrices with different compositions and checking that the quality criteria are met independently of the matrix composition. In this way, and if the parameters are within the limits established by the standard, the method would be validated [3]

Cross-Cultural Adaptation and Psychometric Testing of the International Sedentary Assessment Tool for the Spanish Population

Sedentary behavior (SB) is currently considered a public health problem with a high cost of care. Evaluating SB is essential for prevention and early management of physical inactivity. The International Sedentary Assessment Tool (ISAT) is an instrument that has been developed to assess SB. The aim of this study was to carry out a cross-cultural adaptation and a psychometric analysis of the Spanish version of the ISAT. A cross-sectional study was conducted. A total of 432 participants were included in this study. A double forward method and a backward method were used to translate the ISAT. A psychometric analysis of internal consistency and concurrent criterion validity was performed according to the most up-to-date Consensus-based Standards for the Selection of Health Measurement Instruments (COSMIN). No language difficulties were found in the translation process. The Spanish version of ISAT was readable and acceptable. Internal consistency was satisfactory (α = 0.80). Criterion validity was demonstrated (rho=0.63). The Spanish version of the ISAT is a valid and reliable measure that can be used clinically to assess SB. Further studies assessing other psychometric properties are needed.The APC was funded by Cátedra de Fisioterapia at Universidad de Málaga

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

A detailed chemistry model has been adapted and developed for surface chemistry, heat and mass transfer between H2/CO/air/steam/CO2 mixtures and vertical parallel Pt-coated surfaces. This model is based onto a simplified Deutschmann reaction scheme for methane surface combustion and the analysis by Elenbaas for buoyancy-induced heat transfer between parallel plates. Mass transfer is treated by the heat and mass transfer analogy. The proposed model is able to simulate the H2/CO recombination phenomena characteristic of parallel-plate Passive Autocatalytic Recombiners (PARs), which have been proposed and implemented as a promising hydrogen-control strategy in the safety of nuclear power stations or other industries. The transient model is able to approach the warm-up phase of the PAR and its shut-down as well as the dynamic changes within the surrounding atmosphere. The model has been implemented within the MELCOR code and assessed against results of the Battelle Model Containment tests of the Zx series. Results show accurate predictions and a better performance than traditional methods in integral codes, i.e., empirical correlations, which are also much case-specific. Influence of CO present in the mixture on the PAR performance is also addressed in this paper