An attempt was made to synthesize dyes of the triphenylmethane series, with vanillin as a starting material. Using conventional methods of dye preparation, several brilliant dyes were obtained, but only one of these was finally crystallized. A new method of triphenylmethane preparation was partially investigated. This consisted of condensing 3 methoxy 4 benzoyl benzal chloride, a new derivative of vanillin, with aryl compounds containing auxochrome groups. / Science, Faculty of / Chemistry, Department of / Graduate

This paper will examine and evaluate via computer simulations different methods, both adaptive and non-adaptive, for the feedback control of the color of dyed paper. The objectives are to maintain the paper color at a desired setpoint despite disturbances such as addition of recycled dyed paper (i.e. broke), and to perform color changes as smoothly as possible. The dynamics of a three dye system are multivariable and nonlinear with a significant transport time delay: thus the incentive for adaptive control. Several predictor-based and Dahlin controllers with gain scheduling are designed, tested in simulation, and compared. Adaptive versions using parameters identified with Recursive Least Squares (RLS) are also tested. For practical applications, the non-adaptive Dahlin algorithm with gain scheduling is shown to offer the best performance, together with relative ease of use. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.

No description available.