RESUMENModelo matemático para la extracción de aceite de orujo usando hexano.En este artículo se estudia la influencia de los factores que pueden tener efecto en la extracción del aceite de orujo usando hexano. Se propone a partir de los resultados experimentales, un modelo matemático para el cálculo del rendimiento de la extracción. Los tests estadísticos utilizados para obtener este modelo mostraron que el rendimiento no depende de la granulometría ni de la velocidad de agitación, pero si depende de la temperatura, del tiempo de contacto y de la relación líquido-sólido (L/S). También depende de las interacciones entre el tiempo y la temperatura y entre el tiempo y la relación L/S. La comparación entre los resultados experimentales y el modelo nos permite decir que dicho modelo es satisfactorio.PALABRAS-CLAVE: Aceite de orujo -Extracción con hexano -Modelo matemático. SUMMARYModeling of oil extraction from olive foot cake using hexane.In this work, the influences of the factors, which can have effect on oil extraction from olive foot cake using hexane, are studied. From the experimental results, a mathematical model for calculation of the extraction yield is proposed. The statistical tests used to obtain this model show that the yield does not depend on the granulometry and the stirring rate, but depends on the temperature, the contact time and the liquid-solid ratio (L/S). Also, it depends on interactions between time and temperature and interactions between time and L/S. The comparison of the results given by the experiment and the model allows us to say that the model is satisfactory.KEY-WORDS: Extraction with hexane -Mathematical modelOlive foot cake.

We deal with a complex water distribution problem through a bicriteria fair division model over time with network constraints: we aim at distributing water fairly in a cost-efficient manner. The problem is illustrated for the region of Kabylia, Algeria. It involves the optimization of pump operational schedules as well as strategic planning issues. Complex rules establish energy tariffs depending on the time of day and the contractual issues of the pump facilities. We discuss the relevance and implementation of different solution concepts, showing various alternatives that improve upon current management procedures.

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