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Evaluation of Effect of Eddy Currents in PLC Influenced by Atmospheric Corrosion in the Electronics Industry

材料科学与工程（中英文B版） 2013年第5期3卷 314-321页

作者： Gustavo Lopez Badilla Elizabeth Romero Samaniego sandra luz toledo perea Miriam Maleny Garcia Castrellon Luis Alberto Gameros Rios Researcher-Academic Technological Institute of Mexicali (TIM) Mexicali Baja California M~xico Researcher-Academic Technological Institute of Ensenada (TIE) Ensenada Baja California Mexico Students of Electronic Engineering Technological Institute of Mexicali (TIM) Mexicali B.C. M~xico

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Corrosion in Control Systems Decrease the Lifetime of the Electronic Devices of the Industrial Plants of Mexicali,BC,Mexico

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Open Journal of Air Pollution 2013年第2期2卷 29-35页

作者： Gustavo Lopez Badilla Maria Marcela Acosta Gomez Elizabeth Romero Samaniego sandra luz toledo perea Rodolfo Thomas Guevara Garduno Carlos Omar Gutierrez Marquez Juan Pablo Quezada Hinojosa Researcher-Academic Instituto Tecnologico de Mexicali(ITM)MexicaliMexico Researcher-Academic Instituto Tecnologico de Ensenada(ITE)EnsenadaMexico Students of the Electronic Engineering Instituto Tecnologico de Mexicali(ITM)MexicaliMexico

The principal factor to determine the economical value of the products manufactured in the electronics industry is due to the productive yielding. This is important for the cost of the articles fabricated in this type of industrial plants installed in Mexicali city, where around 80% of companies are, and which fabricate electronic devices and systems, or have industrial electronic systems and machines to their manufacturing process. Mexicalicity is located in theBaja CaliforniaStateof the northwest ofMexico, which is a border city with Calexico in theCaliforniaStateof the United States of America (USA). The region located in Mexicali, is a desert area. Geothermal plant is located in this area, which is an important industry and supplies electricity to this city and its valleys and some cities on southwest of United States for daily activities. This company emits hydrogen sulfide (H2S) as a main air pollutant that reacts with oxygen in the atmosphere, generating sulfur oxides (SOX). This chemical is dispersed to the city of Mexicali in which industrial plants are located with electronic control systems, and penetrates to indoor rooms. Those cause the corrosion process. The presence of corrosion leads to the deterioration of electrical connectors, the connections of electronic systems and the decreasing of the lifetime of these control systems. Other air pollutants that are considered as chemical agents which cause damage to materials used in the electronics industry, are the sulfurs and nitrogen oxides (NOX), emitted from the traffic vehicle and some industries. This causes the low productive yielding of electrical and electronic devices and systems used in the companies of this city, and is a major concern to specialized people, managers and owners. To analyze the productive yielding of electronic devices and systems installed in indoor of the electronics industry. For this reason, to know the principal causes of it, a study in three industrial plants, to determine

关键词： Corrosion Electronic Devices Control Systems Industrial Plants

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Ant Species Richness Variation Mediated by Seasonality in Two Ant-Acacias from Oaxaca, Mexico

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Open Journal of Ecology 2021年第1期11卷 24-31页

作者： sandra luz Gómez-Acevedo Javier Martínez-toledo Unidad de Morfología y Función Facultad de Estudios Superiores Iztacala Universidad Nacional Autónoma de México Mexico City México

Climatic conditions affect the richness of ants resulting in number variation throughout the year. The ants present in the Neotropical system Acacia-Pseudomyrmex have been previously studied considering only one sampling season. In contrast, in this study we analyze the richness in two ant-acacia systems during the rainy and dry seasons. The study was carried out on a plot located in the state of Oaxaca, Mexico where 14 ant species, 3 mutualistic and 11 non-mutualistic were found, of which 2 represent new records for the state. Ant species number differed between ant-acacia species and between seasons. The highest richness was recorded in Acacia hindsii in both rainy and dry seasons, corresponding with a low-reward host. During the dry season, A. hindsii represents a highly valuable resource. This study shows that the neotropical system is much more dynamic than it has been previously considered and offers a valuable opportunity for subsequent ecological studies for a better understanding of this complex system.

关键词： Dolichoderinae Formicinae Myrmicinae Pseudomyrmex

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