Imaginario Social : una aproximación desde la obra de Michel Maffesoli

En este texto presentamos una revisión, -a modo de ejercicio de reflexión colectiva-, de la extensa producción bibliográfica de Michel Maffesoli, buscando articular desde los supuestos presentes en su obra, la noción de imaginario social. Para comprender el contexto de producción de este sociólogo francés, hemos comenzado por hacer una breve revisión de sus principales trabajos e influencias teóricas. Posteriormente hemos centrado la reflexión sobre sus textos fundamentales: El conocimiento ordinario, La orgía, El tiempo de las tribus, Elogio de la razón sensible y El instante eterno. Finalmente, nos aproximamos a la intersección de su obra con el imaginario social de acuerdo a cuatro categorías temáticas propuestas por Enrique Carretero (2003): el significado de la utopía, la problemática en torno a la modernidad, la integración simbólica del neotribalismo y la legitimidad del orden social.In the following text we display a review, -a sort of collective reflection exercise-, regarding the extensive bibliographic production of Michel Maffesoli, trying to articulate the notion of social imaginary departing from the suppositions present in Maffesoli's work. In order to understand the production context of this French sociologist, we began by a brief review of his main work as well as other theoretical influences. Afterwards, his fundamental texts are the subject to a reflection: Ordinary Knowledge, The orgy, The Time of the Tribes, Praise of a Sensible Reason, and The Eternal Instant. Finally, several elements studied were integrated in an approach to the notion of social imaginary, facing four thematic categories following Enrique Carretero's (2003) proposals: utopia's meaning, problems concerning modernity, symbolic integration of neotribalism, and the legitimacy of social order

Prevalence of bleeding secondary to anticoagulation and mortality in patients with atrial fibrillation admitted with SARS-CoV-2 infection

Supplementary data associated with this article can befound, in the online version, at https://doi.org/10.1016/j.medcli.2021.06.015Introduction and purpose: Atrial fibrillation (AF) is common in patients admitted with severe COVID- 19. However, there is limited data about the management of chronic anticoagulation therapy in these patients. We assessed the anticoagulation and incidence of major cardiovascular events in hospitalized patients with AF and COVID-19. Methods: We retrospectively investigated all consecutive patients with AF admitted with COVID-19 between March and May 2020 in 9 Spanish hospitals. We selected a control group of non-AF patients consecutively admitted with COVID-19. We compared baseline characteristics, incidence of major bleed- ing, thrombotic events and mortality. We used propensity score matching (PSM) to minimize potential confounding variables, as well as a multivariate analysis to predict major bleeding and death. Results: 305 patients admitted with AF and COVID-19 were included. After PSM, 151 AF patients were matched with 151 control group patients. During admission, low-molecular-weight heparin was the principal anticoagulant and the incidence of major bleeding and mortality were higher in the AF group [16 (10.6%) vs 3 (2%), p = 0.003; 52 (34.4%) vs 35 (23.2%), p = 0.03, respectively]. The multivariate analysis showed the presence of AF as independent predictor of in-hospital major bleeding and mortality in COVID-19 patients. In AF group, a secondary multivariate analysis identified high levels of D-dimer as independent predictor of in-hospital major bleeding. Conclusions: AF patients admitted with COVID-19 represent a population at high risk for bleeding and mortality during admission. It seems advisable to individualize anticoagulation therapy during admission, considering patient specific bleeding and thrombotic risk.Antecedentes y objetivos: La fibrilación auricular (FA) es frecuente en pacientes ingresados por COVID-19 grave. Sin embargo, los datos sobre el manejo de la anticoagulación crónica en estos pacientes son escasos. Analizamos la anticoagulación y la incidencia de episodios cardiovasculares mayores en pacientes con FA ingresados por la COVID-19. Métodos: Retrospectivamente, se identificaron todos los pacientes con FA ingresados por la COVID-19 entre marzo y mayo de 2020, en 9 hospitales espa ̃noles. Se seleccionó un grupo control de pacientes ingresados consecutivamente por la COVID-19 sin FA. Se compararon las características basales, inci- dencia de hemorragias mayores, episodios trombóticos y mortalidad. Para reducir potenciales factores de confusión se realizó un emparejamiento por puntuación de propensión, así como un análisis multivariante para predecir hemorragia mayor y mortalidad. Resultados: Se incluyeron 305 pacientes con FA ingresados por la COVID-19. Tras el emparejamiento por puntuación de propensión, 151 pacientes con FA fueron emparejados con 151 controles. Durante el ingreso, la heparina de bajo peso molecular fue el principal anticoagulante y la incidencia de hemorragia mayor y mortalidad fue mayor en el grupo de FA (16[10,6%] vs. 3[2%], p = 0,003; 52[34,4%] vs. 35[23,2%], p = 0,03, respectivamente). El análisis multivariante demostró la presencia de FA como predictor indepen- diente de sangrados y mortalidad intrahospitalaria en los pacientes con la COVID-19. En el grupo de FA, un segundo análisis multivariante identificó valores elevados de dímero-D como predictor independiente de hemorragia mayor intrahospitalaria. Conclusiones: Los pacientes con FA ingresados por la COVID-19 representan una población de alto riesgo de sangrado y mortalidad durante el ingreso. Parece recomendable individualizar la anticoagulación durante el ingreso, considerando el riesgo específico de sangrado y trombosis

Análisis de activos financieros en Colombia: cobertura de posiciones con bitcoin

Purpose: To infer which financial assets in Colombia should be hedged with Bitcoin positions and determining their correlation with that cryptocurrency. In addition, this study seeks to improve our understanding of cryptocurrencies (Bitcoin in particular) in order to promote their use and applicability as investment vehicles. Design/methodology: This study used a Dynamic Conditional Correlation (DCC) model, which can incorporate the dynamic correlations and variability of time series when they are volatile. Furthermore, this model offers the univariate flexibility of the Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) model, which can be used to find moments that make the volatility tend to a balance, while evaluating pairs of variables, to provide coefficients that improve the distinction between and interpretation of diversification, safe heaven, and coverage. Findings: The results show that the coefficients produced by the model can be employed to determine the properties of Bitcoin as a hedging mechanism against some fixed and variable income instruments in the national market. They also indicate that Bitcoin cannot be used as a safe haven for all the assets studied here. This gives investors more arguments for decision-making. Conclusions: This study supports the idea that Bitcoin is suitable to be used as an innovative investment product in the Colombian economy because its characteristics make it a financial asset that can be employed to build portfolios and hedge against financial risks. Originality: According to the application of this econometric model and the analysis of its outputs, education in digital assets should be promoted. This is because, in the long term, digital assets become solid and profitable, providing an opportunity to generate earnings at an adequate risk level—which is interesting to investors.Objetivo: inferir los activos financieros del mercado colombiano que pueden ser cubiertos mediante posiciones con bitcoin, determinando el vínculo frente a dicha criptomoneda, así como contribuir al entendimiento de las criptodivisas (en este caso en particular, al bitcoin), en pro de su uso y aplicabilidad como vehículo de inversión. Diseño/metodología: este estudio usó un modelo de correlación condicional dinámico (DCC), el cual tiene capacidad para recoger las relaciones dinámicas y la variabilidad de las series en el tiempo cuando son volátiles y brinda la flexibilidad propia univariante del modelo autorregresivo generalizado condicional heterocedástico (GARCH), que permite encontrar momentos donde la volatilidad tienda a un equilibro que proporcione coeficientes, el cual, al evaluar pares de variables, favorece la diferenciación e interpretación entre diversificación, refugio seguro y cobertura financiera. Resultados: los hallazgos evidenciaron que los coeficientes proporcionados por el modelo permiten concretar las propiedades del bitcoin como mecanismo de cobertura de riesgo frente a algunos instrumentos de renta fija y variable del mercado nacional, así como la inhabilidad de su uso como refugio seguro para todos los activos estudiados, por lo que contribuye para que los inversionistas cuenten con más bases para la toma de decisiones. Conclusiones: esta investigación soporta que el bitcoin es apto para ser utilizado como un innovador producto de inversión en la economía nacional, dado que posee características que lo convierten en activo financiero, con enfoque hacia la construcción de portafolios y generación de coberturas frente a riesgos financieros. Originalidad: a través de la aplicación del modelo econométrico y el análisis de sus salidas, surge la necesidad de comenzar a difundir educación en activos digitales, debido a que en el largo plazo desarrollan solidez y rentabilidad, lo que genera la oportunidad de lograr beneficios bajo un adecuado nivel de riesgo, siendo materia de interés para inversionistas

Influence of excesses of volatile elements on structure and composition of solution derived lead-free (Bi0.50Na0.50)1xBaxTiO3 thin films

The preparation of (Bi0.50Na0.50)1−xBaxTiO3 films requires a compositional/structural control, as they determine the functionality of these materials. We report a systematic compositional and structural analysis on (Bi0.50Na0.50)1−xBaxTiO3 films fabricated by chemical solution deposition. The effects of incorporating Na(I) and Bi(III) excesses are analyzed through the comparison of the compositional depth profiles of stoichiometric films (BNBT) and films containing excesses (BNBTxs). Heterogeneous compositional profiles with larger bismuth content close to the substrate and thicker film-substrate interfaces are observed in BNBTxs, unlike stoichiometric films, which show atomic concentrations that correspond to the nominal composition of the precursor solution. Excesses induce structural differences in depth, observing a shift of the region of coexistence of rhombohedral and tetragonal phases (morphotropic phase boundary) toward higher x values and the formation of thick film-substrate interfaces. In contrast, stoichiometric films have homogeneous compositional and structural profiles with the MPB placed close to that described for bulk ceramics.This work was financed by Spanish Project MAT2013-40489-P. D. Pérez-Mezcua acknowledges the financial support of the FPU Spanish program (AP2012-0639). A portion of this research was carried out at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University. D. Chateigner acknowledges the Conseil Régional de Basse Normandie for its partial financial of the four-circles X-ray diffractometer.Peer reviewe

Design and implementation of an observer-based soft sensor for a heat exchanger

The objective of this work is to describe step-by-step how to implement an observer-based soft sensor in order to estimate process variables for which a hardware sensor is not available. The design and implementation procedure is illustrated by applying it to a counter-flow double-pipe heat exchanger. The approach used to design the nonlinear observer is based on a simplified mathematical model of the process. Numerical simulations and experiments were performed in a bench-scale pilot plant in order to validate the proposed scheme

Prevalence of bleeding secondary to anticoagulation and mortality in patients with atrial fibrillation admitted with SARS-CoV-2 infection.

Atrial fibrillation (AF) is common in patients admitted with severe COVID-19. However, there is limited data about the management of chronic anticoagulation therapy in these patients. We assessed the anticoagulation and incidence of major cardiovascular events in hospitalized patients with AF and COVID-19. We retrospectively investigated all consecutive patients with AF admitted with COVID-19 between March and May 2020 in 9 Spanish hospitals. We selected a control group of non-AF patients consecutively admitted with COVID-19. We compared baseline characteristics, incidence of major bleeding, thrombotic events and mortality. We used propensity score matching (PSM) to minimize potential confounding variables, as well as a multivariate analysis to predict major bleeding and death. 305 patients admitted with AF and COVID-19 were included. After PSM, 151 AF patients were matched with 151 control group patients. During admission, low-molecular-weight heparin was the principal anticoagulant and the incidence of major bleeding and mortality were higher in the AF group [16 (10.6%) vs 3 (2%), p=0.003; 52 (34.4%) vs 35 (23.2%), p=0.03, respectively]. The multivariate analysis showed the presence of AF as independent predictor of in-hospital major bleeding and mortality in COVID-19 patients. In AF group, a secondary multivariate analysis identified high levels of D-dimer as independent predictor of in-hospital major bleeding. AF patients admitted with COVID-19 represent a population at high risk for bleeding and mortality during admission. It seems advisable to individualize anticoagulation therapy during admission, considering patient specific bleeding and thrombotic risk.S

Yo hablo, tu escuchas, ella lee, nosotros escribimos : una pedagogía compartida.

Este libro es producto de una investigación en el aula y de nuestra experiencia docente durante cinco arios en el área de Español del Plan de Nivelación Universitaria (P.N.U.) de la Universidad del Valle. Surge, además, con el propósito de compartir, de manera quizás abreviada, buena parte de nuestro quehacer pedagógico con nuestros colegas que trabajan en lo que hoy contínua llamándose área de lenguaje en el sistema escolar. Esto lo manifestamos como una posición que difiere de la que concibe el lenguaje, y en particular el español, como un asunto al margen de las demás áreas del conocimiento. Los profesores, procedentes de diversas áreas de formación relacionadas con el lenguaje, trabajamos en forma de seminario. Este seminario, impulsado y coordinado durante varios años par Tito Nelson Oviedo, se diseñó con el propósito de dilucidar inquietudes y fomentar discusiones en torno a la enseñanza-aprendizaje del español y a sus implicaciones teóricas, pedagógicas y metodológicas; es as! como en algún momento de este proceso se consideró la posibilidad de IIevar a la escritura una muestra significativa del quehacer en las aulas.El plato de la entrada. Acción pedagógica en la lengua materna / Tito Nelson Oviedo A. -- Con función de diagnóstico. A conocernos / Milena Mazo Salazar -- A manera de sensibilización. El poder de las palabras / Amparo Escobar, Martha Jiménez -- El texto. La textualidad: una mirada de 360° / Alejandro José López Cáceres, Oscar Osorio -- Estructuras y marcas. A jugar con los comics / Oscar Osorio -- Secuencias lógicas / Ferd'nand, Ricardo Salas Moreno. Armando el rompecabezas / Oscar Osorio -- Las implicaturas. Los gritos del silencio / Oscar Osorio -- Coherencia y Cohesión. Historias compartidas / Ricardo Salas Moreno. Cuentos del más acá / Ricardo Salas Moreno -- Con énfasis en la lectura. La lectura: una autopista hacia el desarrollo intelectual / Ricardo Salas Moreno -- Lectura y contexto. El pitufo hablador / Amparo Escobar, Martha Jiménez -- Lectura de textos estadísticos para la producción textual. Lectura entre barrotes / Milena Mazo Salazar -- Lectura del texto audiovisual. Entre el sonido y la imagen / Amparo Escobar, Martha Jiménez -- Con énfasis en escritura y habla. La escritura en la escuela / Milena Mazo Salazar -- Preparando el texto. Iluminando el camino / Amparo Escobar, Martha Jiménez -- El estilo. Cuestión de respiración / Diego Gil Parra -- Tipos textuales. La descripción. A la búsqueda de la palabra precisa / Milena Mazo Salazar. Mensajes cortos. Escritura de todos los días / Oscar Osorio -- La correspondencia. Cartas sobre la mesa / Diego Gil Parra -- El texto directivo. Instrucciones: para vivir en sociedad / Alejandro José López Cáceres -- Resumen y ensayo. Ensayo de una resumida confusión / Alejandro José López Cáceres -- La evaluación. ¿Evaluar o evacuar? / Diego Gil Parr

Chemical vapor deposition growth of boron-carbon-nitrogen layers from methylamine borane thermolysis products

This is the Accepted Manuscript version of an article accepted for publication in Nanotechnology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6528/aa9c07This work investigates the growth of B-C-N layers by chemical vapor deposition using methylamine borane (MeAB) as the single-source precursor. MeAB has been synthesized and characterized, paying particular attention to the analysis of its thermolysis products, which are the gaseous precursors for B-C-N growth. Samples have been grown on Cu foils and transferred onto different substrates for their morphological, structural, chemical, electronic and optical characterizations. The results of these characterizations indicate a segregation of h-BN and graphene-like (Gr) domains. However, there is an important presence of B and N interactions with C at the Gr borders, and of C interacting at the h-BN-edges, respectively, in the obtained nano-layers. In particular, there is a significant presence of C-N bonds, at Gr/h-BN borders and in the form of N doping of Gr domains. The overall B:C:N contents in the layers is close to 1:3:1.5. A careful analysis of the optical bandgap determination of the obtained B-C-N layers is presented, discussed and compared with previous seminal works with samples of similar compositio

Healthcare workers hospitalized due to COVID-19 have no higher risk of death than general population. Data from the Spanish SEMI-COVID-19 Registry

Aim To determine whether healthcare workers (HCW) hospitalized in Spain due to COVID-19 have a worse prognosis than non-healthcare workers (NHCW). Methods Observational cohort study based on the SEMI-COVID-19 Registry, a nationwide registry that collects sociodemographic, clinical, laboratory, and treatment data on patients hospitalised with COVID-19 in Spain. Patients aged 20-65 years were selected. A multivariate logistic regression model was performed to identify factors associated with mortality. Results As of 22 May 2020, 4393 patients were included, of whom 419 (9.5%) were HCW. Median (interquartile range) age of HCW was 52 (15) years and 62.4% were women. Prevalence of comorbidities and severe radiological findings upon admission were less frequent in HCW. There were no difference in need of respiratory support and admission to intensive care unit, but occurrence of sepsis and in-hospital mortality was lower in HCW (1.7% vs. 3.9%; p = 0.024 and 0.7% vs. 4.8%; p<0.001 respectively). Age, male sex and comorbidity, were independently associated with higher in-hospital mortality and healthcare working with lower mortality (OR 0.211, 95%CI 0.067-0.667, p = 0.008). 30-days survival was higher in HCW (0.968 vs. 0.851 p<0.001). Conclusions Hospitalized COVID-19 HCW had fewer comorbidities and a better prognosis than NHCW. Our results suggest that professional exposure to COVID-19 in HCW does not carry more clinical severity nor mortality

Perspectivas de innovación en gestión, educación ambiental para la adaptación y la mitigación

Esta publicación del libro-foro sobre ciudad y cambio climático responde al aporte de los diferentes profesionales de las entidades públicas y privadas que participaron en calidad de conferencistas, ponentes, panelistas y expositores y compartieron sus experiencias en la ciudad como una contribución al conocimiento de las comunidades acerca de la creciente importancia y consideración de la adaptación y mitigación. Se consideraron acciones de políticas públicas por parte de las administraciones públicas, los sectores económicos y la sociedad, grupos ecológicos y fundaciones ecológicas y de igual forma las acciones y grandes esfuerzos realizados por el Ministerio del Ambiente, el IDEAM, la CAR, la Secretaría de Ambiente, el Jardín Botánico, la Red RAUS y de los grupos de investigación de las universidades