M. A. Da Silveira

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Guarana (Paullinia cupana var. sorbilis) is a plant native to the central Amazon basin. Roasted seed extracts have been used as medicinal beverages since pre-Colombian times, due to their reputation as stimulants, aphrodisiacs, tonics, as well as protectors of the gastrointestinal tract. Guarana plants are commercially cultivated exclusively in Brazil to(More)
The H2/H∞ problem is formulated in a Hilbertian context. It has a unique solution, which is the strong limit of sequences generated by Galerkin methods based on convenient, but not necessarily orthogonal, generator sets. Using these results, a methodology to solve the problem by a Galerkin method is proposed, and an example is solved and compared to other(More)
Water injection is a common method to improve reservoir sweep and maintain its pressure. The efficiency of oil recovery in the case of heavy oils is limited by the high mobility ratio between the injected water and oil. Different enhanced oil recovery methods are being developed and studied as more efficient alternatives to water flooding. Dispersion(More)
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