Desarrollo de una interfaz en MATLAB para el estudio de convertidores inversores multinivel

Durante muchos años han existido la necesidad de controlar la potencia eléctrica de los sistemas de alta tensión, por lo que se creó la electrónica de potencia, la cual es una rama que combina: La energía, la electrónica y el control que relaciona los equipos de potencia estáticos y rotativos, para la generación, transmisión y distribución de la energía eléctrica con la microelectrónica a través de dispositivos de estado sólido. La electrónica de potencia en los últimos años ha presentado un gran desarrollo en campo de la energía eléctrica debido a que su objetivo es procesar y controlar el flujo de energía eléctrica mediante el suministro de tensiones y corrientes de forma óptima para las cargas [1], [2] y [3]. Debido a la inclusión de esta rama en los desarrollos tecnológicos y el sector energético, resulta necesario el estudio de los convertidores inversores (CC- CA) multinivel. Para ello se diseñó una interfaz que tiene como objetivo realizar el análisis de una de las topologias de los circuitos convertidores de forma clara y sencilla, en donde el usuario podrá verificar los análisis matemáticos y algebraicos con los resultados obtenidos en la simulación. Para el diseño de esta interfaz se utilizó el toolbox guide de MATLAB..

Modelo canvas para la ampliación de referencias venta de productos de mercado en Alkosto a través de la página web alkosto.com

44 páginas : ilustraciones, gráficos.En Alkosto se ha detectado una oportunidad de crecimiento en las ventas a través de una estrategia omnicanal en el segundo trimestre del 2018, uno de los componentes de esta estrategia es la venta de productos de mercado por medio de la página Web. Dado los antecedentes del E-Commerce a nivel mundial y ahora en nuestro país, entendemos que los consumidores cada vez valoran más su tiempo y quieren aprovecharlo al máximo; gracias a esta conclusión podemos determinar que los productos de la categoría de mercado no se quedan atrás dentro de las ventas online y por el contrario pueden llegar a ocupar un espacio muy importante en la fidelización de los usuarios con la marcaIn Alkosto an opportunity for growth in sales has been detected through an omnichannel strategy in the second quarter of 2018, one of the components of this strategy is the sale of market products for the medium of the website. Given the history of electronic commerce worldwide and now in our country, we understand that consumers increasingly value their time and want to make the most of it; thanks to this conclusion we can determine that the products of the market category are not behind in online sales and on the contrary they can occupy a very important space in the loyalty of users with the brand.Especialista en Gerencia con Énfasis en Logística y Comercio InternacionalEspecializació

Urban seismic risk index for Medellín, Colombia, based on probabilistic loss and casualties estimations

The final publication is available at Springer via http://dx.doi.org/10.1007/s11069-015-2056-4Medellín is the second largest city of Colombia with more than 2 million inhabitants according to the latest census and with more than 240,000 public and private buildings. It is located on an intermediate seismic hazard area according to the seismic zonation of Colombia although no destructive earthquakes have occurred having as a consequence low seismic risk awareness among its inhabitants. Using the results of a fully probabilistic risk assessment of the city with a building by building resolution level and considering the dynamic soil response, average annual losses by sectors as well as casualties and other direct effects are obtained and aggregated at county level. Using the holistic evaluation module of the multi-hazard risk assessment CAPRA platform, EvHo, a comprehensive assessment that considered the social fragility and lack or resilience at county level is performed making use of a set of indicators with the objective of capturing the aggravating conditions of the initial physical impact. The urban seismic risk index, USRi, is obtained at county level which is useful to communicate risk to decision-makers and stakeholders besides making easy identifying potential zones that can be problematic in terms of several dimensions of the vulnerability. This case study is an example of how a multidisciplinary research on disaster risk reduction helps to show how risk analysis can be of high relevance for decision-making processes in disaster risk management.Peer ReviewedPostprint (author's final draft

Incidencia de las relaciones entre la Corporación Universitaria empresarial “Alexander von Humboldt” (CUE) – sociedad - empresa y el gobierno del Departamento del Quindío, para la generación de educación de alta calidad y de altos niveles de competitividad en los profesionales

El modelo que el Equipo de trabajo se propone construir, parte del entendido de que la educación desde el ámbito universitario debe ser concebida como un factor de desarrollo académico, empresarial y humano; ya que es a través de la gestión del conocimiento y su aplicabilidad en el imaginario empresarial, que la región y sus comunidades se forjan alternativas de competitividad y generación de fortalezas económicas, sociales y culturales, para brindar así la posibilidad de crecer e impulsar nuevas alternativas de crecimiento y desarrollo.76 p

Microbial and metabolic succession on common building materials under high humidity conditions.

Despite considerable efforts to characterize the microbial ecology of the built environment, the metabolic mechanisms underpinning microbial colonization and successional dynamics remain unclear, particularly at high moisture conditions. Here, we applied bacterial/viral particle counting, qPCR, amplicon sequencing of the genes encoding 16S and ITS rRNA, and metabolomics to longitudinally characterize the ecological dynamics of four common building materials maintained at high humidity. We varied the natural inoculum provided to each material and wet half of the samples to simulate a potable water leak. Wetted materials had higher growth rates and lower alpha diversity compared to non-wetted materials, and wetting described the majority of the variance in bacterial, fungal, and metabolite structure. Inoculation location was weakly associated with bacterial and fungal beta diversity. Material type influenced bacterial and viral particle abundance and bacterial and metabolic (but not fungal) diversity. Metabolites indicative of microbial activity were identified, and they too differed by material

The influence of age and gender on skin-associated microbial communities in urban and rural human populations

© The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in PLoS One (10): e0141842, doi:10.1371/journal.pone.0141842.Differences in the bacterial community structure associated with 7 skin sites in 71 healthy people over five days showed significant correlations with age, gender, physical skin parameters, and whether participants lived in urban or rural locations in the same city. While body site explained the majority of the variance in bacterial community structure, the composition of the skin-associated bacterial communities were predominantly influenced by whether the participants were living in an urban or rural environment, with a significantly greater relative abundance of Trabulsiella in urban populations. Adults maintained greater overall microbial diversity than adolescents or the elderly, while the intragroup variation among the elderly and rural populations was significantly greater. Skin-associated bacterial community structure and composition could predict whether a sample came from an urban or a rural resident ~5x greater than random.This work was supported by a grant from Johnson & Johnson (China)

The Oral and Skin Microbiomes of Captive Komodo Dragons Are Significantly Shared with Their Habitat.

Examining the way in which animals, including those in captivity, interact with their environment is extremely important for studying ecological processes and developing sophisticated animal husbandry. Here we use the Komodo dragon (Varanus komodoensis) to quantify the degree of sharing of salivary, skin, and fecal microbiota with their environment in captivity. Both species richness and microbial community composition of most surfaces in the Komodo dragon's environment are similar to the Komodo dragon's salivary and skin microbiota but less similar to the stool-associated microbiota. We additionally compared host-environment microbiome sharing between captive Komodo dragons and their enclosures, humans and pets and their homes, and wild amphibians and their environments. We observed similar host-environment microbiome sharing patterns among humans and their pets and Komodo dragons, with high levels of human/pet- and Komodo dragon-associated microbes on home and enclosure surfaces. In contrast, only small amounts of amphibian-associated microbes were detected in the animals' environments. We suggest that the degree of sharing between the Komodo dragon microbiota and its enclosure surfaces has important implications for animal health. These animals evolved in the context of constant exposure to a complex environmental microbiota, which likely shaped their physiological development; in captivity, these animals will not receive significant exposure to microbes not already in their enclosure, with unknown consequences for their health. IMPORTANCE Animals, including humans, have evolved in the context of exposure to a variety of microbial organisms present in the environment. Only recently have humans, and some animals, begun to spend a significant amount of time in enclosed artificial environments, rather than in the more natural spaces in which most of evolution took place. The consequences of this radical change in lifestyle likely extend to the microbes residing in and on our bodies and may have important implications for health and disease. A full characterization of host-microbe sharing in both closed and open environments will provide crucial information that may enable the improvement of health in humans and in captive animals, both of which experience a greater incidence of disease (including chronic illness) than counterparts living under more ecologically natural conditions

Characterizing Herbivore Resistance Mechanisms: Spittlebugs on Brachiaria spp. as an Example

Plants can resist herbivore damage through three broad mechanisms: antixenosis, antibiosis and tolerance1. Antixenosis is the degree to which the plant is avoided when the herbivore is able to select other plants2. Antibiosis is the degree to which the plant affects the fitness of the herbivore feeding on it1.Tolerance is the degree to which the plant can withstand or repair damage caused by the herbivore, without compromising the herbivore's growth and reproduction1. The durability of herbivore resistance in an agricultural setting depends to a great extent on the resistance mechanism favored during crop breeding efforts3