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Search Results: 1 - 10 of 3822 matches for " Gerardo Esquivel Arriaga "
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Increasing Water Use Efficiency in Husk Tomato (Physalis ixocarpa Brot) Production in Tabasco, Mexico with Improved Irrigation Water Management  [PDF]
Rutilo López-López, Ignacio Sánchez Cohen, Marco Antonio InzunzaIbarra, Andrés Fierro álvarez, Gerardo Esquivel Arriaga
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.613114
Abstract: Husk tomato production technology was developed utilizing plastic sheeting and drip irrigation based on the results of reference evapotranspiration and crop coefficients (Kc) proposed at different phenological stages. The objectives of this study were as follows: 1) to evaluate the effect of plastic sheeting on the yield of husk tomato fruit with drip irrigation based on crop evapotranspiration; 2) to validate the use of drip irrigation technology and plastic sheeting in husk tomato production using demonstration plots; and 3) to determine the profitability and economic viability of the product in the domestic market. The proposed Kc values were 0.25, 0.71 and 0.56 in the initial, intermediate and final stage of crop development, respectively. Irrigation rates ranged from 2.5 to 6 mm·day-1, which was equivalent to an irrigation time of 0.6 to 2.5 hr. Soil moisture tension was monitored with tensiometers at depths of 15 and 30 cm in a loamy eutricfluvisol. The use of plastic sheeting increased husk tomato yield by 56.2% and water productivity by 63.5% under drip irrigation conditions when basing irrigation levels on crop evapotranspiration. Soil matrix potential varied between depths of 15 and 30 cm based on irrigation or rainfall amounts and the use of plastic sheeting with values being higher when the plastic sheeting was used. The husk tomato fruit yield in validation plots was 46 and 54.6 t·ha-1 with water use efficiencies ranging from 16.1 to 19.1 kg·m-3. These results exceeded the national average of 14 t·ha-1 and water use efficiency of 2.54 kg·m-3. With this new technology, a cost benefit ratio of 3.6 is obtained, which represents an economically profitable margin for farmers in the region.
Rese a de "La estructura del sistema educativo mexicano" de Adolfo López, Ignacio Morales y Elvia Silva
Emilio Gerardo Arriaga álvarez
Convergencia , 2006,
Abstract:
La Teoría de Niklas Luhmann
Emilio Gerardo Arriaga álvarez
Convergencia , 2003,
Abstract: El presente trabajo, pretende ser un ensayo de interpretación del trabajo teórico del Niklas Luhmann. Es en términos generales, un acercamiento al trabajo teórico, de uno de los sociólogos más originales y controvertidos de las últimas décadas del siglo XX.
Rese a de "Las Guerras del Futuro" de Alvin y Heidi Tofler
Emilio Gerardo Arriaga álvarez
Convergencia , 2000,
Abstract:
Rese a de "La educación superior en América Latina. Globalización, Exclusión y Pobreza" de Laura Mota Díaz y José Luis Cisneros (comps.)
Emilio Gerardo Arriaga álvarez
Convergencia , 2004,
Abstract:
Reingeniería educativa y educación pública mexicana: breve acercamiento
Emilio Gerardo Arriaga álvarez,Rosalba Moreno Coahuila
Espacios Públicos , 2007,
Abstract: Este escrito es un ensayo. Una primera aproximación al tema de la reingeniería educativa y la relación que mantiene con la educación pública mexicana. Para tal efecto, el trabajo se apoya en lo fundamental en el trabajo de Hammer (1994), así como en otras fuentes complementarias.
QUE SABEMOS REALMENTE SOBRE LAS CRISIS CAMBIARIAS?
GERARDO ESQUIVEL,FELIPE LARRAíN B.
Cuadernos de Economía , 2003,
Abstract:
Steel Pitting Corrosion Analysis, Using a High Vaccum Epoxy Penetration Technique  [PDF]
Gerardo Zavala Olivares, Mónica J. Hernández Gayosso, Rafael García Esquivel
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.41002
Abstract:

An epoxy penetration technique was used to reproduce and analyze the pitting corrosion process occurred at a steel coupon surface. The samples were exposed to the resin under high vacuum conditions, in order to fulfill the pits caused by the corrosion process. With this technique, a 3D image of the corrosion damages was obtained. Once the image of the damaged surface was obtained, a Scanning Electron Microscope (SEM) was used to analyze the morphology of the pits exhibited by the steel sample. The results were satisfactory, as different parameters such as the diameter, shape and depth of the pits originated, along with the corrosion preferential path, could be established. According to the results, the use of the epoxy penetration technique may be considered as alternating pitting corrosion analysis technique.

Climate Based Risk Assessment for Maize Producing Areas in Rainfed Agriculture in Mexico  [PDF]
I. Sanchez Cohen, G. Esquivel Arriaga, M. A. Velasquez Valle, Marco A. Inzunza Ibarra, Arcadio Mu?oz Villalobos, P. Bueno Hurtado
Journal of Water Resource and Protection (JWARP) , 2014, DOI: 10.4236/jwarp.2014.613112
Abstract: Rainfed areas in Mexico accounts for 14 million hectares where around 23 million people live and are located in places where there is a little climatic information. The severe drought that has impacted northern Mexico in the past several years as well as other parts of the country, has forced decision takers to look for improved tools and procedures to prevent and to cope with this natural hazard. For this paper, the methodology of the Food and Agricultural Organization of the United Nations (FAO) for estimating water balance variables was modified to provide crop yield estimations under rainfed agriculture in maize producer states of Mexico. The water balance accounts for the daily variation of soil water content having main input rainfall (Pp) and main output crop evapotranspiration (Eta). The algorithm computes crop yield using two distinctive approaches: 1) one based on surplus/deficit functions for each crop considered and 2) yield estimations based on soil water balance and water function productions of the crop being analyzed. For computing water balance and crop yields, a computer model is built that incorporates the FAO method for water balance (MODEL SICTOD: Computational System for Decision Taking, acronym in Spanish) which stochastically generate precipitation based on wet/dry transition probabilities using a first order Markov chain scheme. Maps of average crop yields were obtained after interpolating model outcomes for the main maize producer states of Mexico: Jalisco, Michoacan, Guerrero, Puebla Oaxaca and Chiapas. Different planting dates were analyzed, early (90 days of length period), intermediate (120 days of length period) and late (150 days of length period). Crop yield variability correlates to the transition probability on having a wet day following a dry day. Results have shown high yield variation and probability of crop yield failure and climatic risk follows a distinctive pattern according to planting date and rainfall occurrence. The approach used is of great support for decision taking processes.
Memoria colectiva: vida lacustre y reserva simbólica en el Valle de Toluca, Estado de México
Trejo Sánchez, José Antonio;Arriaga álvarez, Emilio Gerardo;
Convergencia , 2009,
Abstract: it is attempted to show how the communication of meanings and contents of collective memory in the zone of the valley of toluca, state of mexico, mexico, allows treasuring the lacustrine past and contrasting it with the current industrial environment, this enables us to construct and alternative narration of what nowadays has gone missing in respect to the past, providing with a critical meaning the occurrences along time.
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