Activity of alumina supported fe catalysts for N2O decomposition: Effects of the iron content and thermal treatment

Indexación: Scopus.The activity of Fe2O3/Al2O3 catalysts prepared by impregnation of Al2O3 with different amounts of Fe and calcination temperatures (650 and 900 °C) in the direct N2O decomposition reaction was studied. High calcination temperature was introduced to study the effect of "aging", which are the conditions prevailing in the process-gas option for N2O abatement. The catalysts were characterized by BET, XRD, UV-DRS, and H2-TPR. The incorporation of Fe promotes the alumina phase transition (g-Al2O3 to a-Al2O3) when the catalysts are calcined at 900 °C, which is accompanied by a decrease in the specifc area. The activity of the catalysts and the specifc surface area depend on Fe loading and calcination temperature. It was found that highly dispersed Fe species are more active than bulk type Fe2O3 particles. We conclude that Fe2O3/Al2O3 catalysts prepared by impregnation method are active in the decomposition of N2O, to be used at low or high reaction temperatures (tail-gas or process-gas treatments, respectively), as part of nitric acid production plant. © 2018 Sociedad Chilena de Quimica. All rights reserved.https://scielo.conicyt.cl/pdf/jcchems/v62n4/0717-9324-jcchems-62-04-3752.pd

Digital Competences in the Profile of Teaching Education: Context of Remote Education of Peru

Education developed in the virtual context becomes remote today both because of the distance in which school groups are served far from the city, as well as the distance that teachers and students have to reach technological resources to educate and educate themselves, and the resources that affect a higher quality digital education.In this sense, it is understood that digital skills are essential to generate relevant, comprehensive, inclusive and cooperative virtual educational methodologies, especially during the pandemic, which requires mastery of teaching techniques and mastery of these digital skills. The objective was to determine the causality of digital competencies on the teacher teaching profile. The methodology developed was quantitative, causal, correlational and transactional. The sample consisted of 200 active teachers in Basic Education from a Latin American city. These developed their teaching during the onset of the pandemic (2020) until the middle of the year 2021. The variables were evaluated with Likert-type scales. The reports conclude that the scores in digital competencies present moderate intensity of causality and correlation on the teaching profile of those evaluated. Similar effects were found from digital skills on the cognitive and affective characteristics of the profile, although there are common causal effects on motivation. It is suggested to include other variables in a multi-causal analysis, considering vulnerable contexts in evaluating teachers and their execution during the pandemic

On minimal faithful representations of a class of nilpotent lie algebras

In this work we consider 2-step nilradicals of parabolic subalgebras of the simple Lie algebra An and describe a new family of faithful nil-representations of the nilradicals na,c, a, c ∈ N. We obtain a sharp upper bound for the minimal dimension µ(na,c ) and for several pairs (a, c) we obtain µ(na,c ).Fil: Alvarez, María Alejandra. Universidad de Antofagasta; ChileFil: Rojas, Nadina Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigación y Estudios de Matemática. Universidad Nacional de Córdoba. Centro de Investigación y Estudios de Matemática; Argentina. Universidad Nacional de Córdoba; Argentin

Skyrmions, Hadrons and isospin chemical potential

Using the Hamiltonian formulation, in terms of collective variables, we explore the evolution of different skyrmionic parameters as function of the isospin chemical potential ($\mu$), such as the energy density, the charge density, the isoscalar radius and the isoscalar magnetic radius. We found that the radii start to grow very fast for $\mu \gtrsim 140$ MeV, suggesting the occurrence of a phase transition.Comment: 10 pages, 5 figure

Amplification of cestode DNA from the peri-anal region of naturally infected foxes by PCR and LAMP: proof of concept for a potential sampling strategy for diagnosing human taeniosis

The diagnosis of human taeniosis can be achieved through coproscopy, ELISA or PCR. An important limitation of these methods is the high turnaround time for stool sample collection and preparation, indicating the need for a straightforward sampling strategy. Due to the high metabolic activity and reproductive potential of Taenia spp., we hypothesise that parasite DNA (cells and eggs) present in the peri-anal region of the host can be exploited as a target for molecular diagnosis. We evaluated the feasibility of recovering parasite DNA from the peri-anal area of foxes naturally infected with Taenia spp. Before necropsy, cotton swabs were rubbed at the peri-anal region of foxes. DNA was extracted using alkaline lysis coupled with a commercial DNA isolation kit (method A) or alkaline lysis alone (method B). DNA was used in the multiplex-PCR assay (previously described and called here swab-PCR) and a novel LAMP assay detecting Taenia spp. commonly found in foxes (swab-LAMP). The results of these assays from 105 foxes were compared with the presence of intestinal helminths determined at necropsy and by the sedimentation and counting technique (SCT). The sensitivity of swab-PCR for detecting Taenia (n = 68) was 89.8% (95% CI, 77.7–96.6) and 89.5% (66.9–98.7) using methods A and B, respectively. The sensitivity of the swab-LAMP assay was 83.7% (70.3–92.7) using method A and 89.5% (66.9–98.7) with method B. We postulate that peri-anal swab sampling followed by simplified DNA extraction and LAMP might be a suitable strategy for surveillance of human taeniosis in resource-limited settings in the future

Oral communication and interaction: ways to use in the efl class

Las habilidades del habla son elementos importantes y esenciales para la práctica y uso de cualquier lengua, puede representar o mostrar las habilidades obtenidas por el hablante en términos del uso del código lingüístico, estructuras y reglas, conocimientos culturales y metalingüísticos, y otras características aprendidas durante el proceso de adquisición y aprendizaje; adicionalmente, permite al hablante usar la lengua como una herramienta para la comunicación y le da acceso al mundo que le rodea a través de la comunicación e interacción con su realidad. El propósito de este estudio es mejorar la comunicación oral e interacción como herramientas benéficas que puedan mejorar el proceso de adquisición y aprendizaje de una lengua extranjera durante las clases de inglés con los estudiantes de primaria de un colegio privado bilingüe en Bogotá. Para obtener esta meta, fueron realizadas seis (6) sesiones basadas en una orientación de aprendizaje y enseñanza comunicativa, junto con actividades del enfoque de aprendizaje basado en proyectos.El desarrollo de estas actividades quedo evidenciado a través de notas de campo; además se incluyó una entrevista en la cual se identificaron las percepciones de los estudiantes hacia las actividades que se realizaron. Partiendo de estos conocimientos, se evidencia en los resultados que el enriquecimiento de las prácticas de la comunicación oral y la interacción en el aula fomentan el aprendizaje de la lengua extranjera misma en términos de aprendizaje y adquisición, por lo tanto son tópicos a tener en cuenta al momento de plantear nuestras clases y prácticas pedagógicas al momento de enseñar

The nature of leisure revisited : an interpretation of digital leisure

Information and communication technologies have made it possible to engage in leisure and paid-work activities outside their usual context, thereby challenging the construction of their meanings. We explored 30 individuals' narratives in an endeavour to identify the properties of digital leisure and paid-work activities performed in and out of their usual contexts. Our interpretation suggests that the nature of leisure activities is only associated with the freedom of individuals to choose which activity to do and how to do it. The patterns of interpenetration, integration, and segmentation of spaces varied according to informants occupations, but were also moderated by marital status and gender. We conclude with a discussion of how these find¬ings challenge the traditional divisions between work and leisure

Bochdalek hernia associated with intestinal malrotation as an incidental finding in an adult patient: case report

Bochdalek hernia (BH) is the most common congenital diaphragmatic hernia, however in adults the clinical presentation and diagnosis is rare. Intestinal malrotation (IM) is a congenital anomaly that results in an alteration in intestinal anatomy secondary to inadequate intestinal rotation, which occurs at the end of the first trimester of embryonic development, some digestive anomalies may be related, such as diaphragmatic hernia, its Diagnosis is made in the neonatal period although it can be diagnosed in older children and adults, debuting with symptoms of intestinal obstruction or being an incidental finding. Below we present a case report of an adult patient with a diagnosis of Bochdalek congenital diaphragmatic hernia (CDH) in whom an incidental diagnosis of IM was made, who underwent elective surgery, performing laparoscopic diaphragmatic plasty with favorable results

prioriactions: multi-action management planning in R

Designing effective conservation strategies requires deciding not only where to locate conservation actions (i.e. which territorial units should be priortized), but also which type actions should be deployed. For most of conservation planning contexts, deciding where and what to do usually yields a complex and computationally challenging decision-making setting. Although the resulting optimization problems have typically been tackled using heuristic approaches, recent advances in mixed integer programming (MIP) solver technology have turned MIP-based approaches into a practical alternative for solving complex conservation planning problems. We introduce the R package prioriactions, which allows solving complex conservation planning problems comprising prioritization and action deployment decisions. prioriactions features a MIP approach that allows formulating and solving optimally (or nearly optimally) a wide class of conservation planning problems (characterized by different spatial and functional constraints and requirements). Furthermore, the package allows using a variety of commercial and open-source exact solvers enhancing its usability as well as its practical effectiveness. Here, we present a comprehensive description of the main functions available in prioriactions. This package has a workflow of three straightforward steps: (a) validation of the input data, using the inputData() function that prepares input; (b) the creation of a prioritization model, using the problem() function, allows the creation of two types of common models: the minimization of costs to achieve a recovery target and maximizing the recovery benefits given a limited budget; and (c) to solve of the model, using the solve() function. The prioriactions package provides a user-friendly platform for addressing different multi-actions management problems, allowing to identify more rigorously, transparently and in a reproducible way the spatial deployment of management actions.We extend our gratitude to Irlanda Ceballos-Fuentealba and Jordi Garcia-Gonzalo for their valuable contributions during the initial stages of this project. J.S.-R. was funded by the National Agency for Research and Development (ANID, Chile), through a doctoral scholarship (program 2019-72200381) and was also supported by the Centre Tecnològic Forestal de Catalunya (CTFC, Spain) with a part-time contract E-25-2022-0132687. V.H. was supported by an Emergia contract funded by the Junta de Andalucía (EMERGIA20_00135). E.Á.-M. acknowledges the support of ANID through the grant FONDECYT N.1220830, through the Complex Engineering Systems Institute PIA/APOYO AFB220003, and through the Institute of Ecology and Biodiversity ANID/BASAL FB210006. E.Á.-M. also acknowledges the support of the European Union's H2020 Research and Innovation Programme through the MSCA-RISE grant N. 10100795 DecisionES.Peer ReviewedPostprint (published version