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Tuning of Fuzzy Logic Controller for a DC Motor Based on Particle Swarm Optimization PDFHanan A.R. Akkar, Ahlam Najim A-Amir, Mohammed S. SalehThis paper presents an active method to determine the parameters of the membership functions of a F.L. Controller. To provide an optimum performance of the system, the parameters of the membership functions of a fuzzy logic system can be tuned through particle swarm optimization (PSO), so the shape of these functions will vary according to the variables, then the fuzzy control output changes and the performance of the system will be changed.
Removal of Zinc from Aqueous Solution Using Adsorption Phenomena PDFSushma V RachayyanavarAdsorption is one of the most popular methods for the removal of pollutants from effluents since proper design of the adsorption process will produce high quality treated effluents. The most frequently applied adsorbent for the removal of heavy metal is activated carbon. However it is an expensive material. The use of alternative and perhaps cheaper adsorbents is attractive. In the present study, industrial wastes generated in thermal power plant and in sawmill i.e., coal fly ash and sawdust are used as adsorbents in both active and inactive form, for the removal of Zinc ions from the synthetic zinc solution and to evaluate the adsorptive capacities of the same. Increase in the solution concentration decreases the removal efficiency. The optimum contact time for inactive fly ash, active fly ash, inactive sawdust and active sawdust are 60, 120, 60 and 120 minutes respectively. Increase in mass of adsorbent leads to increase in metal ion adsorption due to increase in number of active adsorption sites. Maximum adsorption at pH 6-7 was observed for sawdust and at higher pH value of 8, adsorption was favorable for fly ash. The Freundlich Adsorption model was best fitted for sawdust and fly ash in active and inactive form for the adsorption of Zinc. The experimental data did not represent best fit for Langmuir Adsorption model. The industrial wastes: Fly ash and Sawdust can be used effectively as adsorbents in removal of zinc.
Galvanostatic Removal of Lead from Simulated Chloride Wastewaters using a Flow-by Fixed Bed Electrochemical Cell: Taguchi approach PDFAli Hussein Abbar, Abbas Hamid Sulaymon, Sawsan A. M. MohammedThe Taguchi parameter design approach was used to find the optimal conditions for electrolytic Pb(II) removal using a flow-by fixed bed electrochemical cell composed of a vertical stack of stainless steel screens. The investigated process parameters were initial metal ion concentration, current, flow rate, and mesh number of screen. Removal, current efficiencies, and energy consumption were considered as responses for the optimization of metal removal. An orthogonal array L9, the signal-to-noise(S/N) ratio, and the analysis of variance were used to analyze the effect of selected process parameters and their levels on the performance of Pb(II) removal.The results indicated that concentration and current have the major effect on performance of