Elsevier, Mathematics and Computers in Simulation, (114), p. 14-24
DOI: 10.1016/j.matcom.2010.07.020
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Extraction problems governed by systems of partial differential equations appear in several branches of Engineering. Parameter estimation involves discretization and modeling in a finite dimensional setting. A model that arises in the supercritical extraction area is analyzed in this paper. Numerical diffculties of the nonlinear programming formulation of the estimation process are discussed and a satisfactory procedure based on unconstrained derivative-free optimization is suggested.