Sincelejo, Colombia
Sincelejo, Colombia

The Universidad de Sucre is a public, departmental, coeducational university located in Sincelejo, Sucre, Colombia. The university has three campus in the city. The main one, known as the Puerta Roja is the home for most of the faculties and has the largest student population. The second and smaller campus, known as Puerta Blanca, is home to the Faculty of Health science and its near the University Hospital of Sincelejo. The third campus, known as Puerta Verde or the Granja Pericos is home to the Faculty of Agronomy science and is in the outskirts of the city. The university offers education at undergraduate and postgraduate levels, with 16 academic programs across its five faculties. Wikipedia.

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Troyani N.,University of the East Venezuela | Sanchez M.,University of Sucre
Journal of Strain Analysis for Engineering Design | Year: 2017

The importance of the role played by the so-called stress concentration factors (or symbolically referred to as Kts) in analysis and design in both mechanical and structural engineering is a well-established fact, and accuracy and ease in their estimation result in significant aspects related to engineering costs, and additionally on both the reliability in the design of parts and/or in the analysis of failed members. In this work, rectangular finite width plates of both isotropic and orthotropic materials with circular and elliptical holes are considered. Based on two key observations reported herein, it is shown in a partially heuristic engineering sense, that Howland's solution curve for the stress concentration factors for finite width plates with circular holes subjected to tension can be viewed as a master curve; accordingly, it can be used as a basis to rather accurately estimate stress concentration factors for isotropic finite width tension rectangular plates with centered elliptical holes and also rather accurately used to estimate stress concentration factors for orthotropic finite width rectangular plates under tension with centered elliptical holes. Two novel concepts are defined and presented to this effect: geometric scaling and material scaling. In all the examined and reported cases, the specific numerical results can be obtained accurately using a hand-held calculator making virtually unnecessary the need to program and/or use other complex programs based on the finite element method, just as an example. The maximum recorded average error for all the considered cases being 2.62% as shown herein. © Institution of Mechanical Engineers.

Rosales L.,University of Sucre | Barreto W.,University of the Balearic Islands | Barreto W.,University of Los Andes, Venezuela | Peralta C.,German Weather Service | And 2 more authors.
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We apply the postquasistatic approximation, an iterative method for the evolution of self-gravitating spheres of matter, to study the evolution of dissipative and electrically charged distributions in general relativity. The numerical implementation of our approach leads to a solver which is globally second-order convergent. We evolve nonadiabatic distributions assuming an equation of state that accounts for the anisotropy induced by the electric charge. Dissipation is described by streaming-out or diffusion approximations. We match the interior solution, in noncomoving coordinates, with the Vaidya-Reissner-Nordström exterior solution. Two models are considered: (i) a Schwarzschild-like shell in the diffusion limit; and (ii) a Schwarzschild-like interior in the free-streaming limit. These toy models tell us something about the nature of the dissipative and electrically charged collapse. Diffusion stabilizes the gravitational collapse producing a spherical shell whose contraction is halted in a short characteristic hydrodynamic time. The streaming-out radiation provides a more efficient mechanism for emission of energy, redistributing the electric charge on the whole sphere, while the distribution collapses indefinitely with a longer hydrodynamic time scale. © 2010 The American Physical Society.

Nobrega A.P.,University of Sucre | Rivas S.S.,University of Sucre | Tailleur R.G.,Texas A&M University | Tailleur R.G.,Sarkeys Energy Center | Verruschi E.M.,University of Sucre
Fuel | Year: 2013

The effect of radial heat transfer in a structured catalytic packing was studied by simulating the selective hydrogenation of butadiene in presence of butane and benzene on PdNiCe structured catalytic packing. The catalytic packing operated in a co-current downflow - cooled by the wall (temperature-programmed) - trickle-bed reactor. The model takes into account the presence of mass and heat transfer resistance and uses a heterogeneous kinetic rates model. The program solved, point by point, the mass and energy differential equation of a bidimensional plug flow type reactor model using a numerical method. To calculate the liquid concentrations, an adiabatic flash implemented along the reactor length takes into account the gas-liquid equilibrium. Several mass and heat transfer correlations and own kinetic and deactivation rate constants were used. The program calculates the volume of the reactor for a given conversion and characteristic of the catalysts, as well as the radial and axial profiles of concentrations, temperature, and activities along the cycle length. The sensitivity study performed for the heat transfer parameter demonstrated the influence of benzene, reactor geometry, and the type of heat transfer correlation used in activity, selectivity and stability for the selective hydrogenation of butadiene to butane. The effective heat radial conductivities obtained from published correlations are compared to our experimental values. © 2010 Elsevier Ltd. All rights reserved.

Rebollo-Perez J.,University of Cartagena | Ordonez-Tapia C.,University of Sucre | Herazo-Herazo C.,University of Sucre | Reyes-Ramos N.,University of Cartagena
Revista de Salud Publica | Year: 2011

Objective Determining the prevalence of nasal carriage of S. aureus, both sensitive to methicillin and resistant to it, in preschool children and evaluating the presence of Panton-Valentine leukocidin genes in the isolates. Methods This was a cross-sectional study in which cultures from anterior nares were obtained from healthy preschool children. Isolates were identified as S. aureus based on morphological and biochemical tests. Antibiotic susceptibility profiles were determined by the disk diffusion method. All the isolates were further analyzed by multiplex PCR to determine the presence of mecA and PVL genes; methicillin-resistant isolates were also SCCmec typed by multiplex PCR. Results Overall S. aureus nasal colonization prevalence was 38.5 % and 4.8 % for methicillin-resistant strains. All the methicillin-resistant isolates carried the genes for PVL; two isolates possessed the SCCmec type IV, two were SCCmec type I and one was SCCmec type II. Conclusion This study revealed high PVL-positive, methicillin-resistant S. aureus colonization prevalence in healthy preschool children from Cartagena, which may play a key role in the epidemiology of community-associated infection by methicillin-resistant S. aureus in healthy children from this particular geographical area.

Bejarano E.E.,University of Sucre | Vivero R.J.,University of Antioquia | Uribe S.,National University of Colombia
Memorias do Instituto Oswaldo Cruz | Year: 2010

The phlebotomine sand fly Lutzomyia velezi sp.nov. was described and illustrated from male specimens collected by light trap in the Reserva Natural Cañon del Río Claro in the Central Cordillera of the Colombian Andes. The new species belongs to the series sanguinaria of the subgenus Helcocyrtomyia, which is represented in Colombia by Lutzomyia cirrita, Lutzomyia hartmanni, Lutzomyia sanguinaria, Lutzomyia scorzai, Lutzomyia sp. of Pichindé and Lutzomyia tortura. The new species can be differentiated from others of the subgenus by the combination of the following characteristics: long antennal ascoids, reaching level of the papilla, coxite with a single basal seta and fifth palpomere longer than or equal to the sum of the lengths of the third and fourth palpomeres.

Velez-Liendo X.,University of Sucre | Strubbe D.,University of Antwerp | Matthysen E.,University of Antwerp
Ursus | Year: 2013

Species distribution models are used in ecology and conservation biology to draw inferences about the drivers of species' ranges. However, poor conceptual background, environmental variable selection, and algorithm selection can contribute to misleading model predictions. We assessed the effects of environment variable selection and compared statistical performance and output maps of correlative resource- and biotope-based models for estimating the habitat and potential distribution of the Andean bear (Tremarctos ornatus) in Bolivia's Tropical Andes. The resource-based approach estimated bear habitat using 7 resources associated with 3 ecological functions: feeding, shelter, and access to water. In contrast, the biotope model described the habitat by applying 11 environmental predictors related to topography, vegetation, and human activities. Both models performed equally well overall and better than random, with shelter as the most influential variable for the resource model and Yunga forest for the biotope model. However, discrepancies in the extent and arrangement of predicted bear distribution between models differed and emphasized the effect of variable selection, which could influence the delineation of conservation areas for this species. We suggest using a resource-based approach when modelling species distribution because of the more direct relationship to the species investigated and greater ease of interpreting results.

Esmeral K.,University of Sucre | Maximenko E.A.,National Polytechnic Institute of Mexico
Complex Analysis and Operator Theory | Year: 2016

In this paper we show that the C*-algebra generated by radial Toeplitz operators with (Formula presented.)-symbols acting on the Fock space is isometrically isomorphic to the C*-algebra of bounded sequences uniformly continuous with respect to the square-root-metric (Formula presented.). More precisely, we prove that the sequences of eigenvalues of radial Toeplitz operators form a dense subset of the latter C*-algebra of sequences. © 2016 Springer International Publishing

Objective: To describe the factors that influence over hypertensive patient's adherence to pharmacological and non pharmacological treatment. COOMEVA. Sincelejo, 2006. Materials and methods: Descriptive-quantitative transversal study. The sample was composed of 276 patients between the ages of 35 and 106 years old, 68% masculine and 32% feminine, whom were chosen through a simple random sampling. The information was obtained through a validated instrument and processed by SPSS software. Results: The average age was 61.5 years old. 98% of the participants have no risk factors for adherence problem. Within the factors that influence over treatment adherence, 95% of the patients manifest to have family support in order to complete the treatment, 98% have always had knowledge about their follow up appointments and think that the treatment has been beneficial. 52% of the patients express that having Arterial Hypertension worries them and generates distress because of the changes they must make in their daily life. Conclusions: The therapeutic adherence found in the study reflects that the patients are committed to their health care and attentive pleasant behavior from the health personnel motivates adherence to treatment. However, the study reports that 52% of the patients need strengthening strategies in assuming their disease in order to not be affected emotionally by it.

Villamil P.,University of Sucre
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2010

In this paper we present a calculation of the binding energy of a donor impurity in a cylindrical GaAs-Ga0.6Al0.4As quantum well wire (QWW) as a function of an applied magnetic field for different wire radii and different positions of the donor. The model considers an infinite length QWW with a carrier that is confined laterally by a parabolic potential and the presence of a uniform magnetic field applied parallel to the wire axis. The 1s-like impurity state is considered using the effective-mass approximation within the variational approach. We found that for a given wire radius the binding energy of the impurity increases with the magnetic field and that for a given magnetic field value it decreases with wire radius. Our results are in good agreement with previous theoretical reports. © 2010 Elsevier B.V.

Alvarez-Lopez R.A.,University of Sucre
2016 IEEE Colombian Conference on Communications and Computing, COLCOM 2016 - Conference Proceedings | Year: 2016

Currently the scientific community research on new architectures aimed at reducing costs of implementing management systems for electricity in homes. Becoming more common is the use of open source and hardware in the development of home energy management systems. In this article a new architecture of a HEM system based on open source and hardware is proposed. © 2016 IEEE.

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