Dyes removal from water using low cost absorbents

In this study, the removal capacity of low cost adsorbents during the adsorption of Methylene Blue (MB) and Congo Red (CR) at different concentrations (50 and 100mg•L-1) was evaluated. These adsorbents were produced from wood wastes (cedar and teak) by chemical activation (ZnCl2). Both studied materials, Activated Cedar (AC) and activated teak (AT) showed a good fit of their experimental data to the pseudo second order kinetic model and Langmuir isotherms. The maximum adsorption capacities for AC were 2000.0 and 444.4mg•g-1 for MB and CR, respectively, while for AT, maximum adsorption capacities of 1052.6 and 86.4mg•g-1 were found for MB and CR, respectively. © Published under licence by IOP Publishing Ltd

Production and characterization of activated carbon from wood wastes

Cedarwood (Cedrela Angustifolia) and teak (Tectona Grandis) woods are typically used for furniture manufacture because they have high durability, are light and easy to work. During these manufacturing process, large amount of these wastes is generated causing disposal environmental problems. In this paper, the residual wastes (sawdust) of Cedar (C) and Teak (T) are transformed into an activated material. The chemical composition of both biomass (C and T) was determinate by TGA (Thermogravimetric Analysis). Activated materials were characterized in surface area following the BET (Brunauer, Emmett and Teller) method, morphology using SEM (Scanning Electron Microscopy) and to know their functional groups a FTIR (Fourier Transform Infrared Spectroscopy) analysis was done. Their adsorption capacity was evaluated by removal of Methylene Blue (MB) and Congo Red (CR) from aqueous solutions. © Published under licence by IOP Publishing Ltd

Optimizing Melodic Extraction Algorithm for Jazz Guitar Recordings Using Genetic Algorithms

(Abstract to follow

Regulation of ATF3 expression in cardiomyocytes

The stress responses of cardiomyocytes are likely to constitute a significant aspect of the development of cardiac pathologies. Oxidative stress is a common theme in the pathophysiology of ischaemic and non-ischaemic cardiomyopathy. On the other hand, hypertrophic agonists (e.g. endothelin-1, ET-1) are important mediators of the hypertrophic response to hemodynamic overloading, and cardiac pathologies such as heart failure are usually preceded by cardiac hypertrophy. Microarray studies indicate that one of the genes most potently induced by H2O2 (as an oxidative stress) or ET-1 in cardiac myocytes is the transcription factor ATF3. This thesis examines the regulation and role of ATF3 in neonatal rat ventricular cardiomyocytes. The increase in expression of ATF3 mRNA was confirmed in neonatal rat cardiomyocytes exposed to H2O2 or ET-1 using RT-PCR and Q-PCR. Using immunoblotting, it was confirmed that H2O2 or ET-1 increased ATF3 protein expression. ATF3 is an immediate early gene since the upregulation of ATF3 mRNA by ET-1 was not inhibited by cycloheximide (20 μM). Upregulation of ATF3 was inhibited by U0126 (10 μM), suggesting that signalling through ERK1/2 (extracellular signal-regulated kinases 1/2) was required. Other studies suggest that ATF3 downregulates interleukin-6 (IL-6) in human cells. The rat IL-6 promoter possesses an ATF consensus sequence, and chromatin immunoprecipitation (ChIP) analysis indicated that ET-1 or H2O2 increased the association of ATF3 with the IL-6 promoter. IL-6 mRNA and protein expression was transiently upregulated in cardiomyocytes exposed to H2O2 or ET-1, and this was shown to be an immediate early gene response. Following IL-6 mRNA upregulation, its expression was more rapidly downregulated than that of ATF3. The peak of ATF3 protein expression coincided with the return of IL-6 mRNA to basal levels after stimulation with either ET-1 or H2O2. This suggests that ATF3 operates in a negative feedback loop to downregulate IL-6 mRNA expression in cardiomyocytes. This was confirmed by adenoviral-mediated overexpression of full-length ATF3 antisense RNA, which attenuated ATF3 mRNA and protein expression following stimulation with ET-1. Inhibition of ATF3 expression was associated with superinduction of IL-6 mRNA as shown by Q-PCR. Other potential downstream targets of ATF3 were identified from microarray studies using bioinformatics. Those with ATF/CRE consensus sequences in their promoters included epiregulin and leukaemia inhibitory factor (LIF) (also shown to be immediate early genes). Epiregulin and LIF mRNA expression was superinduced by ATF3 antisense RNA. Taken together, these experiments indicate that ATF3 operates in a negative feedback loop by downregulating a cluster of immediate early genes induced by ET-1. Thus, ATF3 may play an important role in the establishment and fine-tuning of an organised and compensatory hypertrophic response in the cardiomyocyte secondary to hypertrophic stimulation

Evaluación y Sugerencias para la Implementación de la Norma ISO 9001:2015 en el Subsistema de Calidad en la Universidad Distrital Francisco José de Caldas

Figura 1. Árbol del Problema Figura 2. Árbol de Objetivos. Figura 3. Matriz de Poder – Interés. Cuadro No. 1 Cambios representativos de la norma ISO 9001 versión 2015 Cuadro No.2 Normatividad adicional del subsistema de gestión de calidad en la UDFJC Cuadro No.3.Plan de verificación del sistema de gestión de calidad Cuadro No.4 Transición del subsistema de gestión de calidadA partir de la referenciación teórica de autores, y de la NTC ISO 9001:2015 entre otros, sumado a los planteamientos de la Resolución 215 de 2014 de la Universidad Distrital Francisco Jose de Caldas sobre fomento a la cultura de calidad, oriento este trabajo de grado hacia la oportunidad de presentar con el conocimiento y experiencia obtenida con el transcurrir de los años, unas recomendaciones para la transición a la NTC ISO 9001:2015, en dicha institución. Esto también haciendo referencia a la información obtenida en la verificación de calidad realizada cuando estuve trabajando en la oficina asesora de control interno. Para presentar la información a manera de consultoría, me apropio de los 7 principios que hora trae la NTC ISO 9001:2015, para lograr que los conocimientos y competencias se coloquen en práctica con el fin de potencializar recíprocamente pensamientos flexibles, pero solidos de conocimientos en calidad con el fin de orientar la cultura de calidad de dicha institución con una mejora continua y a una gestión del conocimiento de oportunidades previniendo riesgos que se puedan materializar. Se realiza un análisis descriptivo de los requisitos necesario a cumplir para lograr la implementación de la NTC ISO 9001:2015, esto acompañado de la identificación de los entregables que generaría el cumplimiento de cada uno de los requisitos de la nueva versión de la ISO. Lo cual sirve como instrumento para lograr una certificación si se pone en práctica.Based on the theoretical reference of authors, and the NTC ISO 9001: 2015 among others, added to the approaches of Resolution 215 of 2014 of the Francisco Jose de Caldas District University on promoting quality culture, I guide this work of degree towards the opportunity to present with the knowledge and experience obtained over the years, some recommendations for the transition to the NTC ISO 9001: 2015, in said institution. This also referring to the information obtained in the quality verification performed when I was working in the internal control advisory office. To present the information as a consultancy, I appropriate the 7 principles that time brings the NTC ISO 9001: 2015, to ensure that knowledge and skills are put into practice in order to reciprocally potentiate flexible thoughts, but solid knowledge in quality in order to guide the quality culture of said institution with continuous improvement and knowledge management of opportunities preventing risks that may materialize. A descriptive analysis of the necessary requirements to fulfill to achieve the implementation of the NTC ISO 9001: 2015 is carried out, this accompanied by the identification of the deliverables that would generate the fulfillment of each of the requirements of the new version of the ISO. Which serves as an instrument to achieve certification if implemente

Fuerza y movimiento: una propuesta didáctica para estudiantes rurales de noveno grado

Se diseña e implementa una propuesta didáctica para la enseñanza de los conceptos cualitativos de movimiento, fuerza, leyes de Newton y fricción a estudiantes de grado noveno en un colegio rural, usando aprendizaje significativo. La propuesta logra un cambio conceptual en los estudiantes, empleando actividades y juegos de su entorno.Abstract: Movement and force are central concepts of Newtonian Mechanics that are fundamental for the design of mechanisms and processes, and the origin of many concepts in physics. However, teaching them faces up to huge conceptual obstacles that are even more difficult to solve in a countryside environment where students have neither time for homework nor tools like computers or Internet. The present work introduces a didactic proposal for teaching the concepts of force and movement designed for ninth grade students of the I.E. Mortiño School in Isnos (Huila, Colombia). The design emphasizes on qualitative aspects and involves many activities from the rural environment in Isnos that, together with other more universal examples, illustrate fundamental aspects of the concepts of position, velocity and force. The didactic proposal consists of twelve sessions of one hour per week, organized in three sequences: one for position and velocity, one for forces and Newton’s laws of motion and one for friction, all implemented with pre- and posttest. The analysis of the results shows a statistically significant increment of the scores. Actually, the combined scores of the three tests is higher in the posttest for all students. The qualitative description of the implementation also shows a remarkable increase in the interest and motivation by the students, because they discover that the concepts of physics can be found in activities of their own daylife. The strategy constitutes, therefore, a valuable contribution to the teaching of Netwonian Mechanics in countryside environments.Maestrí

Optimización del servicio público de administración de justicia y capacidad de respuesta en el ciudadano, en Lima Norte - 2022

La investigación presentó como objetivo general: Determinar la relación que existe entre la optimización del servicio público de administración de justicia y la capacidad de respuesta en el ciudadano, en Lima Norte – 2022. El enfoque desarrollado fue el cuantitativo, tipo básica, diseño no experimental de corte transversal, descriptivocorrelacional; la población fue de 300 ciudadanos, la muestra es de 179 y se utilizó el muestreo aleatorio simple; se empleó la técnica de la encuesta y se utilizó como instrumento al cuestionario y fue validado conforme al juicio de expertos; el método de análisis de datos fueron las estadísticas descriptivas e inferenciales. Los resultados de la investigación acreditaron la aprobación de la hipótesis general del estudio. En conclusión, la optimización del servicio público de administración de justicia y la capacidad de respuesta en el ciudadano tienen una relación positiva de nivel alto, debido a que el procesamiento de la información obtenida presentó una correlación de Rho de Spearman de 0,675, la significancia fue de 0,000; por lo mismo que, se demuestra que los niveles de optimización se encuentran en un estado regular y su trascendencia en la capacidad de respuesta en el ciudadano es proporcional a esta medida

Revisión documental de investigaciones realizadas entre el 2010-2020 sobre el consumo de sustancias psicoactivas y sus implicaciones en la toma de decisiones y la inteligencia emocional en adolescentes

Análisis documental acerca del consumo de sustancias psicoactivas en los adolescentes y su relación con la toma de decisiones y la inteligencia emocional, entre los años 2010-2020.La presente investigación tiene como objetivo realizar un análisis documental acerca del consumo de sustancias psicoactivas en los adolescentes y su relación con la toma de decisiones y la inteligencia emocional entre los años 2010 y 2020.El estado del arte como estrategia de investigación documental se posiciona en el paradigma histórico-hermenéutico el cual permite la interpretación de material literario, atravésde bases de datos como Sciencedirect. ,digitalia, SCIELO -Scientific Electronic Library Online, Ebsco, y repositorios de trabajos de grado UNIMINUTO, entre otras fuentes de información. Este estudio nombra diversos factores, asociados a la alteración de la inteligencia emocional, posterior a que el adolescente realice actos de consumo de SPA, es posible entender que los jóvenes con una actitud fuera del estándar de normalidad o que no se apegan a las normas establecidas en el contexto familiar y en escenarios externosy quetambién presentan conductas agresivas, tienden a consumir mayor cantidad de alucinógenos, que aquellos que logran establecer una mejor dinámica familiar, donde también incideel factor de educación proveniente del hogar. Estos resultados ofrecen evidencia empírica sobre la evaluación lineal de forma individual, sobre el funcionamiento adaptativo a periodos de edad temprana, por lo que el análisis de estos sostiene la idea de que una autoestima óptima proporciona las habilidades necesarias para ejercer resistencia a la presión grupal de pares, promoviendo una adecuada toma de decisiones al liberar al sujeto de pensamientos o ideas irracionales

A realtime feedback learning tool to visualize sound quality in violin performances

The assessment of the sound properties of a performed mu- sical note has been widely studied in the past. Although a consensus exist on what is a good or a bad musical performance, there is not a formal definition of performance tone quality due to its subjectivity. In this study we present a computational approach for the automatic assess- ment of violin sound production. We investigate the correlations among extracted features from audio performances and the perceptual quality of violin sounds rated by listeners using machine learning techniques. The obtained models are used for implementing a real-time feedback learning system