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Search Results: 1 - 10 of 217218 matches for " Fabián ROBLES MARTíNEZ "
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Effects of Trinexapac-Ethyl on different wheat varieties under desert conditions of Mexico  [PDF]
Raúl Leonel Grijalva-Contreras, Rubén Macías-Duarte, Gerardo Martínez-Díaz, Fabián Robles-Contreras, Fidel Nu?ez-Ramírez
Agricultural Sciences (AS) , 2012, DOI: 10.4236/as.2012.35079
Abstract: A field study was conducted to determine the effect of Trinexapac-Ethyl (TE) on four wheat varieties (Rafi C97, Altar C84, Nacori C97 and Rayon F86) at three growth stages (first node, second node and flag leaf). TE application (150 g a.i. ha-1) reduced plant height and decreased grain yield at any growth stage. Yield decrease was associated to a significant reduction in the number of grains per spike and in grain weight. TE delayed flowering time and grain maturity, while stem diameter and spikes m-2 were not affected. Further studies are needed to clarify the effect of TE on wheat under desert conditions of Mexico.
SECADO DE RESIDUOS DE JARDINERíA EN REACTORES MEDIANTE PROCESOS BIOLóGICOS
Francisco J. COLOMER MENDOZA,Lidón HERRERA PRATS,Fabián ROBLES MARTíNEZ,Antonio GALLARDO IZQUIERDO
Revista internacional de contaminación ambiental , 2012,
Abstract: El biosecado consiste en disminuir la humedad y estabilizar la materia biodegradable para obtener un producto útil como combustible o como paso previo a su depósito en vertedero. Para ello, se aprovecha el calor de la fermentación aerobia de la materia biodegradable. Los parámetros que controlan el proceso son: aireación, temperatura alcanzada y humedad inicial. En este trabajo, se han empleado como sustrato los residuos de jardinería de la Universidad Jaume I de Castellón. El biosecado se realizó en reactores de 25 litros de capacidad en los que se aprovechó el calor generado en la fermentación. La trituración de los residuos y la aireación de estos mejoraron el proceso de biosecado. Los tiempos de secado fueron de 20 días, reducciones de volumen entre el 45.5 y el 63.2 % y de peso del 39.9-57.2 %. El residuo final redujo su humedad hasta un 41.4 % y alcanzó un poder calorífico final (2000 kcal/kg) adecuado para ser usado como combustible.
Biodrying under Greenhouse Conditions as Pretreatment for Horticultural Waste  [PDF]
Fabián Robles-Martínez, Elizabeth M. Silva-Rodríguez, Teodoro Espinosa-Solares, Belem Pi?a-Guzmán, Carmen Calixto-Mosqueda, Francisco J. Colomer-Mendoza, Enrique Durán-Páramo
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.34038
Abstract: The biodrying process was studied as an alternative technology to reduce the mass and volume of horticultural waste. Four static piles were prepared inside a greenhouse: two containing whole waste and two consisting of shredded waste. All the piles were compared with a test pile containing whole waste and placed outside the greenhouse. In two cases, ventilation ducts were installed to improve aeration. Each greenhouse was 2.0 m wide, 3.5 m long and 1.16 m high. The air temperature and relative humidity were monitored both inside and outside the greenhouse. Mass, humidity, organic matter and total nitrogen in the waste were measured. Piles inside the greenhouse showed decreases of 80% and 75% in weight and volume, respectively, during the first 16 days. The data obtained in this work suggest that biodrying could improve the handling and transport of horticultural waste while also minimizing the impact of pollutants.
Effect of Regulated Deficit Irrigation on Productivity, Quality and Water Use in Olive cv “Manzanilla”  [PDF]
Raúl Leonel Grijalva-Contreras, Rubén Macías-Duarte, Gerardo Martínez-Díaz, Fabián Robles-Contreras, Manuel de Jesús Valenzuela-Ruiz, Fidel Nu?ez-Ramírez
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412A3013
Abstract:

The objective of this experiment was to determine the effect of different regulated deficit irrigation (RDI) strategies on productivity, oil quality and water-use efficiency on olive grown in the Sonoran Desert. The experiments were carried out in 2009 and 2010, and in a ten years old traditional (10 × 5 m) “Manzanilla” olive orchard. The control treatment was irrigated at 100% ETc during the whole season while RDI treatments were applied at 75% ETc or 50% ETc. The two RDI were applied during two phenological stages: at postharvest to evaluate the effect on table olive or from pit hardening to harvest to evaluate the effect on oil olive. Our results indicated that RDI applying 50% ETc during postharvest period reduced significantly fruit set and table olive yield, while applied during pit hardening to harvest period, it decreased oil yield but increased oil content. The RDI applying an ETc of 75% during the postharvest period gave similar table olive yield to the control, and applied form of pit hardening to harvest also gave similar oil yield to the control. The RDI using an ETc of 75% resulted in the highest water-use efficiency for oil or table olive production.

Effect of Ethephon on Almond Bloom Delay, Yield, and Nut Quality under Warm Climate Conditions in Northwestern Mexico
Grijalva-Contreras,Raúl Leonel; Martínez-Díaz,Gerardo; Macías-Duarte,Rubén; Robles-Contreras,Fabián;
Chilean journal of agricultural research , 2011, DOI: 10.4067/S0718-58392011000100004
Abstract: world almond (prunus dulcis (mill.) d.a. webb) production is mostly located in areas where flowering is injured by low temperatures, and using ethephon (2-chloroethylphosphonic acid) to delay bloom is suggested as a measure to avoid frost damage. however, it is unknown if that practice could be beneficial in mexico?s warm climates. the objective of this study was to determine the effect of ethephon on almond bloom delay and yield. we evaluated foliar applications of ethephon at doses of 75, 150, and 300 mg l-1 at 10% leaf drop stage and at 150 mg l-1 during dormancy over 2 yr. in 2004, ethephon applied at 10% leaf drop stage delayed bloom by 7, 8, and 9 d at 75, 150, and 300 mg l-1, respectively (p < 0.01), and in 2005, bloom delay was 3 d at 300 mg l-1. ethephon applied during dormancy delayed bloom 2 d in the first year, but showed no effect in the second year. yield and fruit set were affected by ethephon applied at 10% leaf drop stage only in 2004. neither yield nor fruit set were affected by ethephon applied during dormancy in both years. pistil length, nut quality, harvest date, and gum exudation were not affected by ethephon. in accordance with the results, ethephon should not be recommended to delay bloom in almond orchards growing in mexico?s warm climates.
Effect of Ethephon on Almond Bloom Delay, Yield, and Nut Quality under Warm Climate Conditions in Northwestern Mexico Efecto del Ethephon en el Retraso de la Floración, la Producción y la Calidad del Almendro, bajo Condiciones de Clima Caliente del Noroeste de México
Raúl Leonel Grijalva-Contreras,Gerardo Martínez-Díaz,Rubén Macías-Duarte,Fabián Robles-Contreras
Chilean Journal of Agricultural Research , 2011,
Abstract: World almond (Prunus dulcis (Mill.) D.A. Webb) production is mostly located in areas where flowering is injured by low temperatures, and using ethephon (2-chloroethylphosphonic acid) to delay bloom is suggested as a measure to avoid frost damage. However, it is unknown if that practice could be beneficial in Mexico’s warm climates. The objective of this study was to determine the effect of ethephon on almond bloom delay and yield. We evaluated foliar applications of ethephon at doses of 75, 150, and 300 mg L-1 at 10% leaf drop stage and at 150 mg L-1 during dormancy over 2 yr. In 2004, ethephon applied at 10% leaf drop stage delayed bloom by 7, 8, and 9 d at 75, 150, and 300 mg L-1, respectively (p < 0.01), and in 2005, bloom delay was 3 d at 300 mg L-1. Ethephon applied during dormancy delayed bloom 2 d in the first year, but showed no effect in the second year. Yield and fruit set were affected by ethephon applied at 10% leaf drop stage only in 2004. Neither yield nor fruit set were affected by ethephon applied during dormancy in both years. Pistil length, nut quality, harvest date, and gum exudation were not affected by ethephon. In accordance with the results, ethephon should not be recommended to delay bloom in almond orchards growing in Mexico’s warm climates. La producción de almendra (Prunus dulcis (Mill.) D.A. Webb) en el mundo está situada sobre todo en las áreas donde la floración es da ada por bajas temperaturas, y se sugiere el uso del ethephon (ácido 2-cloroetil fosfónico) para retrasarla, como una medida para evitar da os por helada. Sin embargo, no se sabe si esa práctica podría ser beneficiosa bajo los climas calientes de México. El objetivo de este estudio fue determinar el efecto del ethephon (ácido 2-cloroetil fosfónico) sobre el retraso de la floración y la producción de la almendra. Evaluamos la aplicación foliar de ethephon en dosis de 75; 150 y 300 mg L-1 en la etapa de 10% de caída de la hoja, y en 150 mg L-1 en la etapa de dormancia, durante 2 a os. En el 2004, ethephon aplicado en la etapa de 10% de caída de la hoja retrasó la floración por 7; 8 y 9 d a 75; 150 y 300 mg L-1 respectivamente (p < 0,01), y en 2005 el retraso de la floración fue de 3 d a 300 mg L-1. El ethephon aplicado durante dormancia retrasó la floración 2 d en el primer a o pero no hubo efecto en el segundo a o. El rendimiento y el amarre de fruta fueron afectados por el ethephon aplicado en la etapa de 10% de caída de la hoja en 2004, pero no en 2005. Ni la producción ni el amarre de fruta fue afectada en ambos a os por el ethephon aplicado durante dormancia
Consideraciones acerca del proyecto de ley de telecomunicaciones
Fabián Paternina Martínez
Contexto , 1998,
Abstract:
Comparison between logistic regression and neural networks to predict death in patients with suspected sepsis in the emergency room
Fabián Jaimes, Jorge Farbiarz, Diego Alvarez, Carlos Martínez
Critical Care , 2004, DOI: 10.1186/cc3054
Abstract: The study population comprised patients with suspected bacterial infection as their main diagnosis for admission to the emergency room at two University-based hospitals. Mortality within the first 28 days from admission was predicted using logistic regression with the following variables: age, immunosuppressive systemic disease, general systemic disease, Shock Index, temperature, respiratory rate, Glasgow Coma Scale score, leucocyte counts, platelet counts and creatinine. Also, with the same input and output variables, a probabilistic neural network was trained with an adaptive genetic algorithm. The network had three neurone layers: 10 neurones in the input layer, 368 in the hidden layer and two in the output layer. Calibration was measured using the Hosmer-Lemeshow goodness-of-fit test and discrimination was determined using receiver operating characteristic curves.A total of 533 patients were recruited and overall 28-day mortality was 19%. The factors chosen by logistic regression (with their score in parentheses) were as follows: immunosuppressive systemic disease or general systemic disease (2), respiratory rate 24–33 breaths/min (1), respiratory rate ≥ 34 breaths/min (3), Glasgow Come Scale score ≤12 (3), Shock Index ≥ 1.5 (2) and temperature <38°C (2). The network included all variables and there were no significant differences in predictive ability between the approaches. The areas under the receiver operating characteristic curves were 0.7517 and 0.8782 for the logistic model and the neural network, respectively (P = 0.037).A predictive model would be an extremely useful tool in the setting of suspected sepsis in the emergency room. It could serve both as a guideline in medical decision-making and as a simple way to select or stratify patients in clinical research. Our proposed model and the specific development method – either logistic regression or neural networks – must be evaluated and validated in an independent population.Sepsis is the second leading
Implementación de un electromiógrafo con interfaz USB
Urbina Rojas,Wilson Fabián; Martínez Santa,Fernando;
Tecnura , 2012,
Abstract: this paper describes the design and implementation of electromyographic equipment that permits capturing and processing the muscle-electric signals sensed on skin surface. this equipment consists of a signal-conditioning stage (amplification and filtering), followed by analog-to-digital conversion, signal processing and data transmission using a usb port. finally, there is a recording system that allows signal visualization through a software application designed using labview. this device has the advantage of using psoc microcontrollers, which reduce the use of external components due their "on line" reconfiguration and their capability to process analog and digital signals. as a result, practical and low-cost electromyographic equipment is obtained, achieving the aims set by digiti research group. these results will be of use in future projects that are expected to result in a user's interface for quadriplegic people.
Implementación de un electromiógrafo con interfaz USB
Wilson Fabián Urbina Rojas,Fernando Martínez Santa
Tecnura , 2012,
Abstract: This paper describes the design and implementation of electromyographic equipment that permits capturing and processing the muscle-electric signals sensed on skin surface. This equipment consists of a signal-conditioning stage (amplification and filtering), followed by analog-to-digital conversion, signal processing and data transmission using a USB port. Finally, there is a recording system that allows signal visualization through a software application designed using LabView. This device has the advantage of using PSoC microcontrollers, which reduce the use of external components due their “on line” reconfiguration and their capability to process analog and digital signals. As a result, practical and low-cost electromyographic equipment is obtained, achieving the aims set by DIGITI Research Group. These results will be of use in future projects that are expected to result in a user's interface for quadriplegic people.
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