Browsing by Author "DIUC"

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    Comparación de diferentes métodos de sincronización de estros en vacas Cebú con monta natural controlada en el trópico colombiano
    (Universidad de Cuenca, 2015) Uribe, R. D.; Rangel, M. A.; Vargas, D.; Universidad de Cuenca; Dirección de Investigación de la Universidad de Cuenca; DIUC
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    Efecto de suplementos de zinc en la incidencia de caries y en la concentración de Inmunoglobulinas a salivales en niños escolares de talla baja
    (Universidad de Cuenca, 2013-06) Parra Coronel, Janeth; Astudillo, Diana; Sempértegui, Fernando; Universidad de Cuenca; Dirección de Investigación de la Universidad de Cuenca; DIUC
    Young children in Ecuador show high prevalence of chronic zinc deficiency, associated with a decline in cellular and humoral immunity, and increased risk of tooth decay. The research reported in this paper presents the effect of the daily consumption of 10 mg zinc sulfate versus the control group receiving a solution with an inactive substance during 42 weeks, on respectively the children’s weight, height, the immunoglobulin A (IgA) concentration in saliva, the plasma concentrations of zinc, and the indices of Klein and Palmer (DMFT and DMFS). In the survey special attention was given to the detection of early stage tooth decay, also called incipient decay. Parallel, information about the children’s hygiene and living condition was collected using structured questionnaires. Statistical analysis of the collected data revealed that DMFS is less and the final concentration of plasma zinc higher in the experimental group of children receiving daily a zinc supplement (17,30 ± 9,55 vs. 20,03 ± 10,74; p = 0,032; 123 ± 24,29 μg dl-1 vs. 105,57 ± 15,75 μg dl-1; p < 0,001).
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    Estación meteorológica autónoma con transmisión de datos inalámbrica en 5GHz 2x2 MIMO
    (Universidad de Cuenca, 2014) Bosquez, Carlos A.; Lascano, Xavier A.; Universidad de Cuenca; Dirección de Investigación de la Universidad de Cuenca; DIUC
    The article presents the compilation of ocean-atmospheric data in order to increase hit rates in weather forecasting. The project consists in the design of a self-sustaining prototype, able to acquire meteorological data using temperature and humidity sensors coupled to a data acquisition system, that transmit measurements to a PC by means of a microcontroller system and wireless communication system based on MIMO. For the real-time monitoring and managing graphical programming software is used. In addition to the existing systems, the self-sustaining prototype provides contingency plans to prevent possible damage to material property, will benefit the institutions in charge of monitoring meteorological variables, helps the prevention of calamities.
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    Evaluación de modelos hidrodinámicos para representar flujos en cauces naturales
    (Universidad de Cuenca, 2014) Ochoa García, Santiago Aurelio; Reyna, Teresa; Reyna, Santiago; García, Marcelo; Patalano, Antoine; Labaque, María; Universidad de Cuenca; Dirección de Investigación de la Universidad de Cuenca; DIUC
    The free flow occurs when the liquid flows by gravity and only partially confined by a solid circle. In the prediction of the flow variables for different conditions is of great importance to develop hydrodynamic models and numerical simulations with adequate precision to allow proper planning of works. We have studied the use of analytical models in solving phenomena fluid mechanics, which are based on the laws of conservation of mass, momentum and energy. Depending on the degree of simplification that can be reached while maintaining the level of accuracy and verify what good behavior modeled on the nature, there are one-dimensional, two-dimensional and three-dimensional hydrodynamic schemes. A confluence is a complex adaptive convergence since complicated flow parameters produce fluids movement. In this paper the formulation, solution methods and methodologies for developing overall physical and mathematical models for free surface flows is presented. For this study the confluence of the La Cañada stream and Suquía River both of the City of Córdoba.
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    Metales pesados en humedades de arroz en la Cuenca baja del Río Guayas
    (Universidad de Cuenca, 2011-07) Pozo, Wilson; Santafeliu, Teófile; Carrera, Gloria; DIUC; Universidad de Cuenca; Dirección de Investigación de la Universidad de Cuenca
    In the lower basin of Guayas, more in particular in the wetland area, the rice is cultivated on 350.000 ha. An area of 100 km2, covering both sides of the tributary river Babahoyo, situated in the cantons Samborondón and Yaguachi, was selected to study the presence of heavy metals in the top soil and plants. Soil samples were collected in 26 sites, whereas plants were sampled in 5 sampling stations. The concentration of heavy metals in the top soil was related to soil edaphological properties and the concentration in the rice plants, using multivariate analysis. At each site 12 variables were measured resulting over the 26 sites in the following average values: MO 4%, clay 32,7%, loam 49,8%, sand 17,5%, pH 6,6, CE 7,9 mS m-1, metal concentration in mg kg-1 Cu 48,8, Fe 8.734, Mn 343, Zn 34, Hg not detected, Cd 0,15 y Pb 4,4. Statistical analysis revealed that 40,7% of the spatial variability in heavy metals in the top soil is explained by the first two principal components, loam and clay (CP1) and clay and cadmium (CP2). In addition, the 26 sites could be grouped in 6 distinct classes at an euclidian distance of 3,22. Based on the concentration the heavy metals in the top soil rank from high to low as follows: Fe > Mn > Cu > Zn > Pb > Cd and Hg not detected. The concentration of lead in the sites where also the lead concentration was measured in the rice plants, 5 locations in total, ranged