Silver nanoparticles loaded on Cu-doped TiO2 for the effective reduction of nitro-aromatic contaminants

"The addition of Cu species via copper glycine complexes as a strategy for doping the TiO2 structure during the sol–gel process produces a copper–TiO2-based composite. The combination of the copper–TiO2-based composite with the practical UV functionalization of highly dispersed silver nanoparticles (AgNPs), 3 nm, results in an efficient photocatalyst for eliminating 4-nitrophenol as a model of nitro-aromatic contaminant. This novel Ag/TiO2–Cu composite achieved the effective photoreduction of 4-nitrophenol into the valuable 4-aminophenol in approximately 30 min with high conversion (96%). A possible reduction mechanism of aromatic nitro compounds into amines in aqueous alkaline medium is discussed, considering the interfacial fast charge transfer during the in situ reduction of copper by the presence of hydrazine as a sacrificial electron donor.

Personal Anonycloud

Personal AnonyCloud es un proyecto que soluciona varios de los principales problemas en redes hoy en día. Por una parte, actualmente las herramientas VPN solo permiten conexiones punto a punto, es decir, cliente a servidor. Con PA podremos conseguir una red VPN compuesta por varios terminales de repetición y por otro lado aumentar la seguridad, debido a que los terminales son propios. Estas máquinas serán creadas bajo demanda en servicios cloud públicos generales, siendo reemplazadas en caso de cualquier tipo de intrusión. Además, PA ofrece una interfaz intuitiva y simple, permitiendo el uso de la herramienta a cualquier persona, sea cual sea su nivel de conocimiento sobre servicios VP

La inteligencia emocional en alumnos de educación escolar básica de la ciudad de Pilar, en el desarrollo de sus habilidades en contexto educativo

In the city of Pilar, Department of Ñeembucú, the present research work is carried out, whose objective is to know the emotional intelligence in students of basic school education in the city of Pilar, in the development of their skills in the educational field . The students and teachers of the subsidized public urban schools of the city linked to the Redemptorist Foundation of Social and Educational Works of Pilar (FROSEP) are taken as the object of study. To achieve the objectives and taking into account the relevance of the topic, it seeks to measure the importance of intrapersonal and interpersonal intelligence and its influence on the academic performance of students from the aforementioned educational institutions. For this purpose, methods and techniques that correspond to the nature of the study are used, adjusting to the parameters of a mixed research approach, with a concurrent triangulation design (DITRIAC). In this regard, the work responds to a descriptive study, resorting to quantitative and qualitative method techniques, which ensures a more reliable way of data collection. It stands out as an important finding that there is correspondence in those students who achieve high levels of emotional intelligence and high grades. The same situation occurs with respect to those students who present average levels of emotional intelligence and average grades. In addition, the personal perceptions that children present about themselves, as well as their self-esteem, are high, with effective and quality social skillsEn la ciudad de Pilar, Departamento de Ñeembucú, se lleva adelante el presente trabajo de investigación, cuyo objetivo radica en conocer la inteligencia emocional en los alumnos de educación escolar básica de la ciudad de Pilar, en el desarrollo de sus habilidades en el ámbito educativo. Se toma como objeto de estudios los alumnos y docentes de las escuelas urbanas públicas subvencionadas de la ciudad vinculadas a la Fundación Redentorista de Obras Sociales y Educacionales de Pilar (FROSEP). Para alcanzar los objetivos y atendiendo la relevancia del tema, se busca dimensionar la importancia que alcanza la inteligencia intrapersonal e interpersonal y su influencia en el rendimiento académico de los alumnos de las mencionadas instituciones educativas. Para el efecto, se recurre a métodos y técnicas que corresponden a la naturaleza del estudio, ajustándose a los parámetros de un enfoque de investigación mixta, con un diseño de triangulación concurrente (DITRIAC). En este aspecto, el trabajo responde a un estudio del tipo descriptivo, recurriendo a técnicas de los métodos cuantitativo y cualitativo, lo que asegura una manera más confiable de recolección de datos. se destaca como hallazgo importante que existe correspondencia en aquellos alumnos que alcanzan niveles altos de inteligencia emocional y calificaciones altas. La misma situación acontece con respecto aquellos alumnos que presentan niveles medios de inteligencia emocional y calificaciones medias. Además, las percepciones personales que presentan los niños sobre sí mismos, así como la autoestima, son elevados, con habilidades sociales efectivas y de calida

Structural, textural and acidic properties of Cu-, Fe- and Cr-doped Ti-pillared montmorillonites

Montmorillonite has been treated with Ti-based solutions, alone or doped with Cu2 +, Fe3 + or Cr3 + cations, yielding new intercalated solids, which have been calcined at various temperatures to test the stability of the so-formed pillars. The solids calcined at 500 °C were fully characterized by chemical analysis, X-ray diffraction, FT-IR spectroscopy, thermal analyses, nitrogen adsorption and acidity evaluation. The evolution of the specific surface area, porosity and acidic properties is discussed, analysing the effect of pillaring and doping procedures on these propertie

Masa muscular, fuerza isométrica y dinámica en las extremidades inferiores de niños y adolescentes con síndrome de Down

En general se ha observado que las personas con síndrome de Down (SD) tienen valores inferiores de fuerza muscular comparados con personas sin SD. También existe un déficit de masa muscular en los adultos con SD comparados con otros sin SD. Sin embargo, ningún estudio hasta la fecha había evaluado esta masa muscular en población pediátrica. Nuestro estudio pretende poner de manifiesto si también a edades tempranas existe un déficit de masa muscular y además relacionar ambos valores. Los niños y adolescentes con y sin SD (15±3 y 14±3 años respectivamente) de nuestro estudio obtuvieron valores similares de masa muscular ajustada por talla y estadio puberal, pero el grupo con SD obtuvo valores inferiores de fuerza (p<0.05). Además de esto, el grupo con SD ejerció menos kilogramos de fuerza por cada kilogramo de masa muscular. Alguna causa fisiológica o de transmisión podría explicar esta falta de fuerza ya que, al menos en esta franja de edad no existe un déficit de masa muscular. Deberían incentivarse los programas de entrenamiento específicos para este tipo de población para comprobar si es posible un incremento en su fuerza muscular.Generally it has been observed that population with Down syndrome (DS) has lower levels of muscular strength compared with others without DS. It is also known a deficit between muscular mass between adults with and without DS. However, there are no studies until the date which evaluated muscular mass in paediatric populations. Our study pretends to show whether also in earlier ages it does exist a deficit in the muscular mass and also to relate both values. Children and adolescents with and without DS (15±3 y 14±3 years respectively) from the study had similar values of muscular mass adjusted by height and puberal status, but DS group obtained lower values in all strength parameters. In addition, DS group also performed less kilograms of strength by kilogram of muscular mass. Some physiological or transmission impairment could explain this lack of strength as it known that there are not deficit in the muscular mass. Specific and adapted for this population training programs should be promoted to check whether an enhancement in their muscular strength is possible.Peer Reviewe

Effect of posterior gingival smile on the perception of smile esthetics

Objectives: To evaluate and compare the influence of posterior gummy smile on the perception of smile esthetics by orthodontists, general-dentists and laypersons. Study Design: A frontal photograph of a smile with normal gum exposure was chosen and manipulated digitally using Adobe Photoshop C3 to generate three further images with posterior gum exposure of 4, 6 and 8mm. These four images were assessed by the three evaluator groups: orthodontists (n=40), general-dentists (n=40) and laypersons (n=40). Both orthodontists and dentists had at least ten years professional experience and laypersons were aged between 40-50 years. The proportion of men to women was 20:20 in each group. Evaluators awarded a score to the smile esthetics of each image: 1=acceptable, 2=moderately acceptable, 3=unacceptable. Afterwards, each evaluator placed the four images in order of esthetic preference. Results: No significant differences (p>0.05) were detected between the three evaluator groups for the photo without posterior gummy smile. The perception of smile esthetics for a the 4mm posterior gummy smile (median for orthodontists=2, general-dentists= 1, laypersons=1), the 6mm (median for orthodontists=2, general-dentists=1, laypersons=1) and the 8mm (median for orthodontists=3, general-dentists=2, laypersons=2) was significantly different between orthodontists and the other two evaluator groups (p<0.0017). The three evaluator groups coincided in placing the image with the 6mm gum exposure in first place in order of esthetic preference. Conclusions: Posterior gummy smile influences the perception of smile esthetics more negatively among orthodontists than the rest of the groups

Meta-analyses in management: what can we learn from clinical research?

We analyze the weaknesses of meta-analyses (MAs) in management research using as benchmark a scientific field where this technique shows a longer tradition: clinical research. We suggest four areas in which management research MA practices should improve: (1) availability of information and replicability of primary research, (2) correct application of statistical support, (3) execution of heterogeneity analyses, and (4) standardization of result reporting. Using a representative MA on an operations management topic, we identify qualitatively the aspects to be improved at each stage. We show the different results that could have been achieved by following standard procedures in clinical research, incorporating different “good practices” from this research field. Overall, these recommendations aim at improving the transparency and replicability of MAs, which can not only facilitate the accumulation of scientific knowledge but also intensify the dialogue between academia and practitioners.Ministerio de Economía y Competitividad | Ref. ECO2016-76625-RXunta de Galicia | Ref. ED431C 2018/46Fundação para a Ciência e a Tecnologia | Ref. UIDB/04728/202