Enfoque UTE

pp. 1 - 9

Authors: Wang ZhaoZheng, Fang Xi, Henry Paúl Romero Cortez, Fausto René Ramos Aguirre

This article describes the essential ideas of an experimental procedure performed in order to check the filter-cake removal system is suitable for use like filter-cake removal system for pay zone. This system is made on aqueous phase and its concentration depend of the quantity of filtercake estimated in the wellbore of horizontal wells. This optimized the wellbore cleaning and increase the worth of well. The results of tests show that system could work, but it needs further analysis for determine the compatibility with fluids and rock from reservoir.

pp. 25 - 40

Authors: José Estrada, Mayra Calva, Ana Rodríguez, Christian Tipantuña

Telephony is a global service and thus telephone networks have been a coveted target for criminals. Now that voice can be transported over IP and that multiple services are integrated in a convergent model through Internet, there are more incentives to attack and more attackers. Moreover, the development of open source telephone applications has encouraged the massive use of IP telephony, but not an increased awareness about embedded security risks. Due to the current and intensive adoption of IP telephony systems in Ecuador, we conducted an exploration based on public information to obtain statistics about telephone systems connected to Internet in Ecuador. Additionally, using a deliberately vulnerable IP telephony system, we collected more data to do a preliminary analysis of threats to such systems. We found that hundreds of telephone systems were publicly available on the Internet and using outdated versions of Asterisk-based applications. We also found thousands of malicious interactions on the IP telephony system we deployed on the Internet.

pp. 55 - 68

Authors: Carlos Alfredo Pérez Albán, Alexis Cordovés García, Jorge Román Terán Benalcázar

The goal of this paper is the design and implementation of a system for controlling the quality of the combustion gases in a fire-tube boiler of 5 BHP. Based on the percentage of O2 present in the combustion gases, measured by a lambda sensor, the percentage of CO2 emitted into the atmosphere is determined. PID proportional control is responsible for the automatic regulation of the entry of air to the boiler by an actuator, according to the percentage of the oxygen concentration in the combustion gases. The control system has an HMI display and a modular PLC. The results achieved ensure pollutant gases emissions within the parameters established by current environmental standards, achieving the required quality of combustion gases and reducing the fuel consumption of the boiler.

pp. 82 - 96

Authors: Ximena Aguirre Ulloa, Alexandra Endara

The forest near the Hostería Selva Virgen, located in Pichincha, northwestern Andean Chocó area, is one of the biodiversity hotspots in the world, reason that determined the analysis of the vascular flora in the zone. For this study we did a temporary transects of 50 x 4 and 50 x 2 m covering an area of 0.1 hectares. We calculated Sorensen, Simpson and Shannon indexes, using the Past software, obtaining the following results: 159 species (spp.) registered corresponding to 121 genera and 54 families. Families with more species were: 15 spp Moraceae, Rubiaceae 10 spp, Arecaceae 9 spp, Fabaceae 9 spp, Melastomataceae 8 spp and Meliaceae 8 spp. The diversity obtained has a value of 0.95. It is interpreted in the Simpson index as a high diversity. Richness was 0.33, interpreted as an average richness. Sorensen index identifies areas that share more species. Endemism is low: 6.25%. The high biodiversity found in the studied forest shows an important biological richness; therefore more studies are suggested, because this zone has been rarely explored from the biological point of view.

pp. 109 - 119

Authors: Paola Vallejo Choez, Carmen González Moya, Fredy Mena Mora

This is a preliminary investigation on the environmental quality of the city of Pujilí, made from the collection of samples of particulate matter and vehicular traffic counts on six points of the city. The methodology is based on the provisions of the Unified Text of Secondary Environmental Legislation for measuring atmospheric particulate matter, and the use of count tables for vehicle registration. The results reflect the impact of vehicular traffic, the characteristics of the rolling road layer, soil erosion, and climate on air pollution and its impact on the health of the population.