Ultrasonic Applied in Osmanthus Fragrans Lour.Polysaccharide Extracting Process
In this study,the process conditions for extracting polysaccharides from Osmanthus fragrans Lour. with the assistance of ultrasound were optimized by single factor and orthogonal array design methods. The optimal extraction process conditions were determined as follows:ultrasound power,480 W;and material/liquid ratio,1:25 (g/mL)for an extraction duration of 25 min. Under these conditions,the extraction yield of polysaccharides from Osmanthus fragrans Lour. was 10.39%. The decreasing order of importance of the three process conditions affecting polysaccharide extraction was ultrasound,power material/liquid ratio and extraction duration.
In this paper, a fuzzy gain scheduling control approach based on gain and phase margins specifications for nonlinear systems with time varying delay, is proposed. A multi-objective particle swarm optimization (MPSO) strategy is defined to tune the fuzzy gain scheduling controller parameters for each operating condition, so the gain and phase margins of the fuzzy control system are close to specified ones. Experimental results show the efficiency of the proposed methodology for control of a thermal plant with time varying delay.