32543 research outputs found
Sort by
Hacia un modelo de asociatividad intra-zonal, para la gestión de Presupuesto Participativo, en el distrito de Medellín
No full textEl presente documento se propone como un acercamiento a un modelo de asociatividad intra-zonal de carácter urbano que trace los lineamientos para el desarrollo de una estrategia eficaz en la ejecución de los recursos del Presupuesto Participativo en el distrito de Medellín. Este modelo toma como referencia el análisis de las problemáticas intra-zonales de la Zona 1, conformada por las comunas Popular, Santa Cruz, Manrique y Aranjuez, así como de sus dinámicas de participación ciudadana.
El documento parte del hecho que los Esquemas Asociativos Territoriales – EAT vigentes en Colombia y reglamentados por la Ley 1454 de 2011 son eficientes en su funcionamiento para la solución de problemas y/o el aprovechamiento de ventajas comunes a los miembros del EAT.This document is proposed as an approach to a model of intra-zonal associativity of urban character that outlines the guidelines for the development of an effective strategy in the execution of the resources of the Participatory Budget in the district of Medellin. This model takes as a reference the analysis of the intra-zonal problems of Zone 1, formed by the communes Popular, Santa Cruz, Manrique and Aranjuez, as well as their dynamics of citizen participation.
The document starts from the fact that the Territorial Associative Schemes - EAT in force in Colombia and regulated by Law 1454 of 2011 are efficient in their operation for the solution of problems and/or the exploitation of advantages common to the members of the EAT.MaestríaMagíster en Gobierno y Políticas Pública
Evaluation of the application of suspensions of iron oxide magnetic nanoparticles functionalized with quaternized chitosan and phosphates on yellow maize and chili pepper plants
No full textWe have applied aqueous suspensions of magnetite-maghemite nanoparticles functionalized with quaternized chitosan and phosphate groups on yellow maize (Zea Mays) and chili pepper (Capsicum annuum) plants, at greenhouse conditions, to evaluate if any beneficial or adverse effects are produced by these nanocomposites in the development of these kind of plants at morphological and physiological level. Phytotoxicity assays with yellow maize seeds showed excellent germination percentages in all treatments evaluated, as well as increasing indicators of biomass and root length of germinated seeds for suspensions of nanoparticles with iron contents up to 50 ppm. Suspensions of nanoparticles with iron contents higher than 50 ppm led to decreasing indicators of biomass and root length of germinated seeds compared to lower iron contents. Iron contents of 100 ppm showed indicators lower than those of the control, suggesting phytotoxic effect of these nanocomposites for iron contents above 100 ppm. Measurements of morphological and physiological parameters of plants of both crops in greenhouse conditions, treated with suspensions of nanoparticles with iron-phosphorus contents of 25 − 3, 35 − 4 and 45 − 5 ppm, commercial fertilizer as positive control and tap water as a negative control did not evidence any phytotoxic or beneficial effect. The results suggest that, although these nanocomposites did not have a noticeable effect as vehicles of micro and macro nutrients as iron and phosphorus in the evaluated plants, they did not produce phytotoxic effects on them at the morphological and physiological level for iron contents less than 50 ppm, as they showed adequate growth and development
Lipopeptides from Bacillus tequilensis EA-CB0015 and cinnamon extract decrease the bioenergetic response of Fusarium oxysporum f. sp. Cubense
No full textLipopeptides (LPs) from B. tequilensis EA-CB0015 have antifungal activity against Fusarium species. Specifically, against F. oxysporum f. sp. cubense (Foc), the cause of Fusarium wilt of banana. Cinnamon (CN) extract is also known for its inhibitory activity against the Fusarium genus. The main goal of this research was to determine whether the effect of LPs and CN extract or their combination against a Foc isolate is related to an impairment of mitochondrial function. Our results show that biomass decreased by 74% (p < 0.0001) and 84% (p < 0.0001) when cultures were treated with 128 ppm LPs and 152.5 ppm CN extract, respectively. In parallel, we found a pronounced impairment of the bioenergetic response. That is, the routine oxygen consumption rate diminished by 55% (p = 0.0148) and 38% (p < 0.0001), respectively. Moreover, the ATP-linked respiratory rate decreased by 63% (p = 0.0461) and 44% (p = 0.0005), while the FCCP-simulated respiratory rate by 63% (p = 0.0255) and 45% (p = 0.0002). Therefore, our data suggest that the altered bioenergetic response observed in cultures of Foc treated with LPs or CN is mainly caused by an impairment of the activity of the respiratory complexes. On the other hand, biomass production was reduced by 80% (p < 0.0001) when cultures were treated with a mixture comprising only 10% LPs and 40% CN extract. Furthermore, ATP-linked and FCCP-stimulated respiratory rates decreased by 62% (p = 0.0024) and 68% (p < 0.0001), respectively under the same conditions. A potentially synergistic antifungal effect of cyclic LPs with a CN extract is suggested
Lie algebra classification, conservation laws and invariant solutions for the kind generalization of the Duffing-type equation
No full textThis paper makes significant contributions to the study of a generalized form of the Duffing-type equation. We derive the generating operators of the optimal system associated with this equation, enabling us to characterize an implicit solution. Additionally, we present a complete classification of group symmetries and obtain the Lagrangian for the equation. Our results include the classification of the Lie algebra and the optimal system, providing a thorough understanding of the equation’s underlying structure. These contributions serve to enhance the current body of knowledge on the Duffing-type equation and provide useful insights for future research in this area
Desarrollo de un plan exportador de carne de cordero desde Colombia a un futuro mercado potencial con un enfoque estratégico y sostenible
No full textEste trabajo se centra en analizar posibles clientes en el exterior para la comercialización de carne de cordero desde ColombiaMaestríaMagíster en Agronegocio
Opciones reales secuenciales compuestas como método para valorar proyectos de inversión de varias etapas para empresas farmacéuticas en Colombia
No full textMaestríaMagíster en Administración Financier
Construcción del plan estratégico para la empresa Colfachadas : una mirada desde el posicionamiento y la ventaja competitiva
No full textMaestríaMagíster en Ingenierí
Acuerdos de compra de energía (PPA, power purchase agreements) para sistemas fotovoltaicos en el mercado colombiano. Riesgos y escenarios financieros
No full textMaestríaMagíster en Administración Financier
Pronóstico de la curva de rendimientos de Colombia mediante análisis de componentes principales y modelos de aprendizaje automático
No full textMaestríaMagíster en Administración Financier