توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Robust Meta–Heuristic Approach for Modeling and Scheduling of the Multi–objective Flexible Manufacturing Systems
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنفرانس بین المللی مهندسی صنایع، سال
تعداد صفحات: ۶
The aim of this paper is to present a new mathematical model for multi–objective flexible manufacturing systems. The first objective is to minimize mean job tardiness and mean job earliness and the second one, mean machine idle time, simultaneously. This problem which minimizes a mix of these criteria is in the NP–hard class of problems. Therefore, to overcome the computational complexity of the addressed FMS scheduling problem use of meta–heuristic method to tackle large scale problems is inevitable. In this paper, genetic algorithm is taken into consideration for solving the addressed FMF scheduling problem. In addition, Taguchi method is utilized to tune the parameters of the algorithm and analyze the parameters of the studying problem, simultaneously. Furthermore, to show the superiority and applicability of the algorithm a test problem is applied. Finally, the computational results illustrate the superior performance of the proposed genetic algorithm approach for the problem.<\div>

۲Effect of Polyaniline on Catalytic Activity of Platinum Nanoparticles in Direct Methanol Fuel Cells
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۹
Polyaniline (PANI) nanofibers were synthesized chemically by interfacial method. These nanofibers were doped by para toluene sulfonic acid and the doped PANIs were utilized for the fabrication of Vulcan (C) – PANI composite. Platinum (Pt) particles were subsequently deposited by reduction onto the C–PANI composite to produce Pt\C–PANI electrocatalyst. The performance of the resultant electrocatalyst was evaluated by measuring the stripping onset and peak potential of adsorbed CO,peak current density of methanol oxidation, electrochemical surface area, stability, and electrochemical impedance spectroscopy. It was shown that the existence of low content polyaniline in structure of the electrocatalyst can improve the activity of Pt nanoparticles interestingly. The current peak during methanol oxidation, the electrochemical surface area, the stability and the impedance of the Pt\C–PANI electrocatalysts were better than those observed using Pt\C+PANI (commercial Pt\Ccomposites containing PANI) or Pt\C electrodes. Also, the onset and peak potential of CO oxidation are less than those in the two mentioned electrodes; therefore, polyaniline increases the CO tolerance of Pt nanoparticles. X–ray diffractometry and transmission electron microscopy were also applied to investigate the crystallite size and the surface morphologies, espectively<\div>
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