Empresas Publicas de Medellin

Medellín, Colombia

Empresas Publicas de Medellin

Medellín, Colombia
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Cadavid E.,Empresas Publicas de Medellin | Saenz L.M.,Pontifical Bolivarian University
Advances in Intelligent Systems and Computing | Year: 2017

This article presents Empresas Públicas de Medellín’s (EPM) strategy for the prevention and control of occupational sports injuries. The strategy works alongside EPM’s physical activity program to increase the overall quality of life of the Company’s employees, and is based on Colombian legislation that stated in 2012 that occupational accidents should also include those that occur when recreational, sporting and cultural activities are carried out on behalf of, or while representing an employer. The article presents concepts, policies and activities related to the practice of sports at EPM, and how these are aligned with the systemic approach of ergonomics. The article also looks at how EPM has managed to reduce these kinds of accidents, and how the strategy has strengthened actions for prevention and health promotion in an occupational context. In doing so, it has ratified the Company’s Business Commitment with the wellbeing and overall quality of life of its employees. © Springer International Publishing Switzerland 2017.

PubMed | University of the Atlantic, Catholic University of the East, National University of Colombia, Fundacion Verdes Horizontes and 3 more.
Type: Journal Article | Journal: Journal of fish biology | Year: 2016

The remarkable fish diversity in the Caribbean rivers of north-western South America evolved under the influences of the dramatic environmental changes of neogene northern South America, including the Quechua Orogeny and Pleistocene climate oscillations. Although this region is not the richest in South America, endemism is very high. Fish assemblage structure is unique to each of the four aquatic systems identified (rivers, streams, floodplain lakes and reservoirs) and community dynamics are highly synchronized with the mono-modal or bi-modal flooding pulse of the rainy seasons. The highly seasonal multispecies fishery is based on migratory species. Freshwater fish conservation is a challenge for Colombian environmental institutions because the Caribbean trans-Andean basins are the focus of the economic development of Colombian society, so management measures must be directed to protect aquatic habitat and their connectivity. These two management strategies are the only way for helping fish species conservation and sustainable fisheries.

Montoya Ramirez R.D.,University of Medellín | Cuervo F.I.,University of Medellín | Monsalve Rico C.A.,Empresas Publicas de Medellin
Renewable Energy | Year: 2016

This work presents an assessment of the potential use of hydrokinetic turbines in the discharge channels of large hydroelectric power plants in Colombia. The assessment is performed at a pre-feasibility stage in order to evaluate the technical and financial potential of using hydrokinetic devices as a way to exploit kinetic energy in such channels. As a case study, two large hydropower plants were selected, one operated by a Francis turbine and the other operated by a Pelton turbine. The analysis assessed the hydraulic characteristics of the channels and the corresponding discharge flows. A prefeasibility financial analysis in an environment of uncertainty was also carried out using Monte Carlo simulation. The results show that the technology is not currently feasible for the Colombian market conditions, but the situation should be monitored in order to identify the right time for its optimal use in the future. The proposed methodology can be applied to research the feasibility of hydrokinetic energy for other kinds of applications. © 2016 Elsevier Ltd

Reyes J.C.,University of Los Andes, Colombia | Ardila-Bothia L.,University of Los Andes, Colombia | Smith-Pardo J.P.,Seattle University | Villamizar-Gonzalez J.N.,University of Los Andes, Colombia | Ardila-Giraldo O.A.,Empresas Publicas de Medellin
Engineering Structures | Year: 2016

In order to evaluate the effect of containers on the dynamic response of a pile-supported storage structure, this paper presents results of 154 shake table tests conducted using a 1:15 scale single story model that supported a block with the possibility to slide and/or rock. The experimental program involved five block-to-structure mass ratios, two block aspect ratios, and two seismic hazard levels. Drift demands on the model were measured to be higher when the structure supported a squat block as compared to a slender block with the same mass. The implementation of a statistical methodology to quantify the effect of the blocks on the seismic response of the one-story laboratory model showed that for the conditions of the experimental program: (a) squat blocks had a larger portion of their mass effectively contributing to inertial forces on the structure as compared to slender blocks; (b) the portion of the block's mass that was effective as inertia does not exhibit a clear correlation with the block-to-structure mass ratio (even though drift demands on the model were consistently higher for heavier blocks); (c) the live load percentages that are prescribed in current codes and standards may significantly underestimate the contribution of live load to inertial forces, especially for service-level ground motions. A design expression previously developed by the authors was favorably compared against the experimental results reported in this paper. Numerical modeling was carried out to extend the conclusions and observations to conditions beyond those of the experimental program. © 2016 Elsevier Ltd

Agudelo P.A.,Empresas Publicas de Medellin | Hoyos C.D.,Georgia Institute of Technology | Curry J.A.,Georgia Institute of Technology | Webster P.J.,Georgia Institute of Technology
Climate Dynamics | Year: 2011

About 50-60% of Atlantic tropical cyclones (TCs) including nearly 85% of intense hurricanes have their origins as African Easterly Waves (AEWs). However, predicting the likelihood of AEW intensification remains a difficult task. We have developed a Bayesian diagnostic methodology to understand genesis of North Atlantic TCs spawned by AEWs through the examination of the characteristics of the AEW itself together with the large-scale environment, resulting in a probabilistic discrimination between large-scale environments associated with intensifying and decaying AEWs. The methodology is based on a new objective and automatic AEW tracking scheme used for the period 1980 to 2001 based on spatio-temporally Fourier-filtered relative vorticity and meridional winds at different levels and outgoing long wave radiation. Using the AEW and Hurricane Best Track Files (HURDAT) data sets, probability density functions of environmental variables that discriminate between AEWs that decay, become TCs or become major hurricanes are determined. Results indicate that the initial amplitude of the AEWs is a major determinant for TC genesis, and that TC genesis risk increases when the wave enters an environment characterized by pre-existing large-scale convergence and moist convection. For the prediction of genesis, the most useful variables are column integrated heating, vertical velocity and specific humidity, and a combined form of divergence and vertical velocity and SST. It is also found that the state of the large-scale environment modulates the annual cycle and interannual variability of the AEW intensification efficiency. © 2010 Springer-Verlag.

Rodilla P.,Comillas Pontifical University | Batlle C.,Comillas Pontifical University | Salazar J.,Empresas Publicas de Medellin | Sanchez J.J.,Secretaria de Estado de Cambio Climatico
Energy Policy | Year: 2011

In an attempt to provide electricity generation investors with appropriate economic incentives so as to maintain quality of supply at socially optimal levels, a growing number of electricity market regulators have opted for implementing a security of supply mechanism based on long-term auctions. In this context, the ability to analyze long-term investment dynamics is a key issue not only for market agents, but also for regulators. This paper describes a model developed to serve this purpose. A general system-dynamics-inspired methodology has been designed to be able to simulate these long-term auction mechanisms in the formats presently in place. A full-scale simulation based on the Colombian system was conducted to illustrate model capabilities. © 2010 Elsevier Ltd.

Garcia C.,Empresas Publicas de Medellin | Garcia E.,University of Antioquia | Villada F.,University of Antioquia
Informacion Tecnologica | Year: 2012

The optimization of the expansion planning of the real distribution system in the city of Medellin in Colombia, is analyzed in this work. The distribution system has 155 nodes and 154 branches at a voltage level of 13200 volts. Efficient evolutionary algorithms are applied, with the purpose of observing their improvements and performance when compared with conventional evolutionary algorithms. Besides, a mono-stage and mono-objective distribution planning model, which objective function is the optimization of construction costs and technical losses of the system is also studied. Finally, the impact of specially designed efficient operators for optimization is discussed and the estimated costs are analyzed.

A review on the most common species of grasses and forages in Colombia to determine their potential use as lignocellulosic materials for the production of fuels like bioethanol and biobutanol is presented. For this, location, production yield per hectare and per year, lignocellulosic composition and ethanol yield are considered as main characteristics for determining their potential use. As result, elephant grass and king grass, are presented as the most appropriate ones for their exploration in biofuel production processes with green forages yields per acre per year between 360 and 400 ton and between 240 and 360 ton, respectively. Furthermore based in its cellulose and hemicellulose concentration, theoretical ethanol yields of 466,9 L/dry ton of elephant grass and 449,7 L/dry ton of king grass are obtained.

Montoya C.A.G.,Empresas Publicas de Medellin | Perez J.A.G.,Empresas Publicas de Medellin
2014 IEEE PES Transmission and Distribution Conference and Exposition, PES T and D-LA 2014 - Conference Proceedings | Year: 2014

This paper presents a methodology proposed in international literature by the IEEE std 1410 2010 like a guide to evaluate the effect of nearby lightning strokes on distribution lines, calculation induced transients and analysis performance of overhead distribution lines in EPM for a type of study. According to topology constructive of electrical network, there is a answer in the performance of overhead line; likewise, it is presented the results of a parametric study that determine the significant influence of the lightning's basic parameters in the induced transients originated in a overhead distribution network. © 2014 IEEE.

The effect of different alkaline pretreatment conditions with sodium hydroxide (NaOH) on the recuperation of cellulosic fraction, lignin removal and ethanol production was evaluated through simultaneous saccharification and fermentation of elephant grass and king grass ((Pennisetum purpureum and Pennisetum hybridum). These types of grass are potential raw materials for bioethanol production from cellulosic fraction. Results obtained in ethanol production show that under pretreatment conditions of 120°C, 60 minutes, 2%(w/w) of NaOH and a liquid to solid ratio of 20 (w/w), the highest ethanol concentrations are obtained: 27.7 g/L and 26.1 g/L for king grass and elephant grass respectively, in 24 hours of fermentation. Furthermore, under the evaluated conditions it was observed that lignin removal was 88.4% for elephant grass and 94.0% for king grass. The detoxification stage eliminates inhibitors formed during pretreatment, which affects the hydrolysis and fermentation.

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