v. 20 n. 2

artigo de atualização

• Briquets: solid combustible from heavy oil and biomass

  A. Requena, M. Spech, M. Pérez

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• Pigments detennination in sediments from a tropical water body

  Julio Cesar Marín Leal, María Elena Romero González, Marinela Colina de Vargas, Hilda Ledo de Medina

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• Tropospheric propagation effects at GPS observations in Venezuela

  Gustavo Acuña, Melvin Hoyer, Eugen Wildermann

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• Pressure drop of three-phase suspension flows (water-air-sand) in horizontal pipelines

  Filippo Pironti, Gabriel Pellegrino, Gluber Meza, Nelson Ramírez

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• Five-dimensional Kaluza-Klein Theory reformulated

  Williams Pitter, Mario Choy

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• A generalization of the Ricets distribution

  José Sarabia

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• Some results involving the parabolic cylinder function

  Giovanna Pittaluga, Laura Sacripante, Laura Sacripante

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• Variable structure control with integral action

  J. Ramirez, J. Bastidas, C. Vinante

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• Control of tbe angular position of a direct current motor using PID control, fuzzy control and neural control

  José Canelón, Nestor Queipo

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• Designing, building and evaluating semi-industrial equipment for applying diffusional coating on steel

  Oladis Troconis de Rincon, Jes í¹s Ludovic, Nelson Romero, Ennie Huerta, Alfredo Navarro, Miguel Sánchez

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