توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Geotechnical Investigations Optimization Using Rough Set Theory
نویسنده(ها): ، ،
اطلاعات انتشار: نهمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۸
Geotechnical investigations are performed to evaluate geologic, seismologic, and soils conditions that affect the safety, cost effectiveness, design, and execution of a proposed engineering project. Currently, advanced methods have been developed for making the best decision in site selection to prevent unnecessary costs which are very important in large construction projects. In this paper a new approach has been developed based on the Rough Set theory that was presented by Pawlak (1991), a well–known mathematician. The results of practical studies indicate that using this method for projects can reduce costs, by preventing occurrence of hazard events due to geotechnical uncertainties. The rough set method is a method to deal with geotechnical uncertainties. The Results of Rough Set theory not only provide a baseline for decision making but also insights to the problem of concern. Using simple geotechnical problems we demonstrate that Rough set theory may supply a useful means for decision making under uncertainties<\div>

۲Using CFD method to optimum the hydraulic design of WSPs and increasing the operational efficiency
نویسنده(ها): ، ، ،
اطلاعات انتشار: کنفرانس و نمایشگاه مهندسی آب، سال
تعداد صفحات: ۱۰
In many countries especially in developing countries, the natural ways for wastewatertreatment like wastewater stabilization ponds (WSPs) are so popular because good efficiency and noneeds to high technology. Furthermore the WSPs are suitable for wastewater treatment in smallsocieties and some special industries namely slaughterhouse, dairy products, meat products and etc.The advantages of this method are high efficiency in treatment of pathogens, toxic and organicmaterials. But there are some problems and issues in using them. Inappropriate design can leads todead space and short–circuiting and Etc in the ponds and will reduce the efficiency. In this regard, in thispaper the hydraulic design of WSPs have been considered and the CFD method used for modeling.Therefore a WSP pond modeled with Fluent software and some parameters like different inlets andoutlets length and situation and also different numbers of inlet structures modeled and analyzed tooptimum the efficiency. The model is calibrated with field data of previous Tehran WSP. The results ofCFD modeling show the numbers of inlet and outlet structures change the spatial distribution of thevelocity and with increasing the number of structures, more uniform flow and cross sectional velocityprofile occurs. With increasing in the length of the inlet structures the dead space increase andtherefore the retention time decrease so the efficiency of the WSP operation reduce. The models withinlet structure in the bed also have more uniform flow profile in comparison with inlet structure in thewall. For other parameters and conditions the papers, manuals and documents about the WSPs checkedand analyzed and at the end some methods and tips presented to improve the efficiency of WSP ponds.In conclusion, it can be seen that the CFD models are needful to optimum the efficiency of WSP ponds.<\div>
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