No. 23 (junio 2013)
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Item Arsénico en el agua(Universidad de Cuenca, 2013-06) Cabrera, María Alezandra; Pinos, David; Pulla, María FernandaArsenic (As) is a metalloid found naturally in air, soil and water. Have toxicological importance due to its environmental impact even in little concentrations. It is released by human activities and naturally by the earth’s crust. People can be exposed to arsenic mainly through food and water, especially in certain areas where groundwater comes into contact with arsenic containing minerals.Item Breve historia de la informática en la Universidad de Cuenca(Universidad de Cuenca, 2013-06) Guerrero Villavicencio, PatricioItem Breves referentes de la historia universitaria(Universidad de Cuenca, 2013-06) Merchán, HernandoItem Calidad del agua en los ríos de Cuenca(Universidad de Cuenca, 2013-06) Alvarez, Diego Xavier; Cabrera, Tania; Loja, José LuisThis article describes how to measure water quality and its application to quantify water quality of rivers of Cuenca, studies of master plans, results and measures to achieve better water quality to get the current state.Item Calidad del agua y contaminantes en el río Tarqui(Universidad de Cuenca, 2013-06) Beltrán, Alberto; Mendieta, Paul; Vanegas, JuanThis research shows us specifically the contaminants in the Tarqui river located on the outskirts of Cuenca city. The parameters used to determine the water quality of the river were: DBO5 , fecal coliforms, water quality (Physical-Chemical), and the biotic index. The samples were taken at 8 different stations (1 station at the Portete River, 1 station at the Irquis River, 5 stations at the Tarqui River, and 1 station at the Cumbe River). What refers to DBO5 the samples are into the range of clean water; about the fecal coliforms were obtained bad results because of the intensive livestock in the area; the quality index that represents the condition throughout the river has label of good finally the biotic index indicates that the river´s healtn has a regular condition. These data reflects stability in the Tarqui River´s health except in the Cumbe River´s area where peaks of contamination appear.Item El cobro del peaje(Universidad de Cuenca, 2013-06) Peña Toral, Rómulo RolandoItem Contaminación difusa producida por actividades agrícolas(Universidad de Cuenca, 2013-06) Avila, Juan; Reinoso, Paola; Zambrano, SandraWe can realize that today with the world’s growing population, human needs increase on a large scale, among these needs there is one very important for the development of the population such as feeding. This huge demand for food has led to develop techniques and technologies to improve the quality and quantity of the food production. However, the development of these new techniques and technologies has not only generated great benefits to mankind but has also caused a great increase in the pollution problem, causing degradation in the environment and in the public health. In agriculture, to increase and accelerate the production, have been made chemicals such as pesticides and fertilizers, many of these with great implications for water supplies that deteriorate ecosystems and change the water quality for human use. In some countries there is a control law, though in most countries there are not any regulations that make a control of the discharge limits, and it should be noted that agriculture is one of the few activities in which chemicals are deliberately discharged into the environment to destroying many form of life.Item Control PID aplicado sobre un variador de velocidad(Universidad de Cuenca, 2013-06) Fárez, Juan Pablo; Chumbi, RenéThis document is an automatic control project focused on the use of programmable logic controllers. The project is a speed control on a closed loop induction motor having as motor driver interface. The control system is dominated by logic programmed into the PLC the same turn interacts with the operator through an HMI. For purposes of study from the HMI commands the generation of different set point signal: sine wave, square wave with amplitude and frequency parameters configurable.Item Control PID digital algoritmo, diseño e implementación(Universidad de Cuenca, 2013-06) Ochoa Correa, Danny VinicioItem Los cuatro pilares de la educación(Universidad de Cuenca, 2013-06) Delors, JauqesItem Desarrollo, ética y tecnología(Universidad de Cuenca, 2013-06) Pauta, GuillerminaItem El deslizamiento de la Josefina: "tragedia nacional"(Universidad de Cuenca, 2013-06) Zeas Domínguez, RodrigoItem Diez principios de la gestión de proyectos que pueden ayudarte en tu profesión(Universidad de Cuenca, 2013-06) Mejía, XavierItem Diseño y construcción de un dimmer inteligente para control a distancia de cuatro lámparas(Universidad de Cuenca, 2013-06) Fárez, Juan Pablo; Chumbi, RenéThis paper describes the development process to design and build a dimmer can con- trol four separate incandescent lamps by remote control, capable of maintaining the brightness of an environment automatically and store different brightness settings, in addition to rhythmic lights feature. It covers the conception and implementation of this equipment, without further detail in the description of the technical aspects.Item Enfoque básico del saneamiento ambiental(Universidad de Cuenca, 2013-06) Pacheco, Freddy; Once, David; Verdugo, JessicaToday, the theme of environmental quality and health of human beings is at risk due to environmental pollution, and lack of sanitation, it exists more in underdeveloped countries, existing problems caused by unhealthy lack of treatment in water, solid waste and excreta. This often happens due to lack of knowledge of people, how to treat the waste, so that this document will show what it’s about environmental health, so that citizens have an understanding on this issue and we note that these problems can be solved and we can prevent epidemics and major damage to humanity.Item Estudio de selección de una arquitectura orientada a servicios (SOA), para ser implementada en el programa: manejo del agua y el suelo (PROMAS)(Universidad de Cuenca, 2013-06) Veintimilla, JaimeItem Estudio del concepto del parámetro de estabilidad de shields como un método para el diseño de canales erosionables(Universidad de Cuenca, 2013-06) Córdova Mora, Mario Andrés; Vallejo Llerena, Carolina ElizabethThis study discusses and analyzes the concept of the stability parameter in order to set the calculation expressions that allow the design of erodible channels. With the conceptual exposure of these processes, we have included an analysis of new mathematical relationships for the incipient motion curve and for determining the stability parameter. This paper is a contribution to the dissemination of knowledge and indicates a guide to the application of the method in the context of the course in Hydraulic. Design which is taught at the Career of Civil Engineering, Faculty of Engineering of the University of Cuenca.Item Evolución de las bases de datos(Universidad de Cuenca, 2013-06) Zalamea, OlgaItem Herramienta metodológica para alcanzar el aprendizaje significativo(Universidad de Cuenca, 2013-06) Ochoa, DannyThis article presents a brief discussion about the importance of engineering laboratory practice, and how these contribute to the achievement of meaningful learning by students. It also makes recommendations for the development of practice guidelines and the role it should play both students and teachers to achieve the desired goals.Item Huella hídrica (‘Water Footprint’)(Universidad de Cuenca, 2013-06) Araneda, Ronnie; Alvarez, Juan; Argudo, GeovannyThe term "Water Footprint", makes reference to the total volume of freshwater required in the production of different goods and services that a human being, a society or a country consume. When is about calculating the water footprint is necessary to considerate the several components of it such as blue, green and gray water footprint, as well as regard the virtual water of each product. However, a general method to calculate the water footprint has not been established, it is be because of the different characteristics and factors that are unique in each region. The meaning of water footprint was introduced in order to manage in a better way the freshwater resource on earth.