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Chaker K.,Skikda University | Moussaoui A.,University of 08 Mai 1945 Guelma
World Scientific Proc. Series on Computer Engineering and Information Science 7; Uncertainty Modeling in Knowledge Engineering and Decision Making - Proceedings of the 10th International FLINS Conf. | Year: 2012

This paper describes a multivariable H2-H∞ robust control approaches, for an ill conditioned, difficult to control system, given by a plasma chemical reactor CF4/O2. The control of such a system resulted, in the past, in a slow, oscillatory coupled response. The goals of applying robust controls, is the achievement of a decent smooth response with minimum oscillations and overshoot. In the pursuit of this goal, we proceed to the quantification of uncertainties affecting the plasma process. Then, the robustness conditions in closed loop, to be achieved, are clearly stated. Only then, the H2 and H∞ algorithms are applied, after the construction of the augmented system resulting from the standard process form. To provide the advantages of the H∞ algorithm, we applied the H2 one and compare the results obtained between the two controls. Source


Fatiha M.,University of 08 Mai 1945 Guelma | Leila L.,University of 08 Mai 1945 Guelma | Leila N.,University of 08 Mai 1945 Guelma | Eddine K.D.,University of 08 Mai 1945 Guelma
Journal of Inclusion Phenomena and Macrocyclic Chemistry | Year: 2013

Two models namely A and B were considered to investigate the inclusion process of ethylparaben into β-CD cavity by means PM3, HF/6-31G (d) and B3LYP/6-31G (d). The obtained results with PM3 method clearly indicate that the formed complexes are energetically favored with or without solvent; the B complex is found more favored than A complex. The calculated deformations energies show that the geometry of β-CD is deformed in the complexation process on the other hand the ethylparaben do not undergo deformation. Finally, From NBO analysis, the donor and acceptor interactions between ethylparaben and β-CD were analyzed and discussed. © 2012 Springer Science+Business Media B.V. Source

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