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Rafael Barreto on Muck Rack

Rafael Barreto

As seen in: Jornal Extra, PLOS, MDPI, Taylor & Francis Online, Consultor Jurídico, O Popular, Dialnet - Universidad de La Rioja, JOTA, Tribuna Do Sertao, Arena Rubro-Negra
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Articles

Nitrogen Forms and Silicon Sources in Tomato Plant Growth

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By Rafael Barreto, Reginaldo de Oliveira, Renato de Mello Prado
| Taylor & Francis Online
ABSTRACT Silicon (Si) is known to alleviate several abiotic stresses in plants, including ammonium (NH4+) toxicity. However, the availability of Si in the nutrient solution depends on factors such as the Si source and NH4+ concentration. This study evaluated the effects of two Si sources, stabilized silicic acid (ASiE) and potassium silicate (SiK), on Micro-Tom tomato grown under NH4+ toxicity.
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Investigacion experimental del trabajo de los motores asincrónicos con frecuencia de 50 Hz en redes de 60 Hz

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By Rafael Barreto, Svietlana Petrovna Maliuk, Pérez Barreto
| Dialnet - Universidad de La Rioja
español En el trabajo se exponen los resultados de los ensayos de un motor asincrónico con el rotor en cortocircuito del tipo A0-51/4 de fabricación soviética en régimen de marcha al vacío, y de cortocircuito en redes de 50 y 60 Hz. Se muestra cómo influye la variación de la frecuencia en las principales características técnico-energéticas del motor.
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Principios metodológicos para la elección del complejo carga-transporte óptimo

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By Rafael Barreto, Pérez Barreto, A. A. Kulyeshov
| Dialnet - Universidad de La Rioja
English This work describes the fundamental methodological principles for the selection of the optimun type of excavator-truck complex, both in the projection stage and in the mining process. The working parameters of both the excavator and trucks are obtained by the value of the ponderal module of the complex. The optimun type is, definitively, chosen by the criterium mínimum reduced cost in the loading, transportation and unloading of the mineral.
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