توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال ۱۳۸۶
تعداد صفحات: ۷
In this work extraction of clove oil from clove buds has carried out by water \ hydrodistillation and supercritical fluid extraction methods. In the measurements effect of several parameters such as heating power (120, 200, 250, 400 and 600 W) (for water\hydro distillation method), and pressure (90, 120, 150 bar) (for supercritical fluid extraction method) on the extraction yield and the content of eugenol in extracts are investigated. Compositions of essential oil of clove buds are detected by gas chromatography (GC). The results show that the heating power is effective on the eugenol content in the distillated extracts. The maximum of eugenol extracted by hydro distillation is obtained in heating power of 600W.<\div>
اطلاعات انتشار: Civil Engineerng Infrastructures Journal، چهل و ششم،شماره۲، jun ۲۰۱۳، سال ۰
تعداد صفحات: ۱۲
Failure of the quay walls due to earthquakes results in severe economic loss. Because of hazards threatening such inexpensive nodes of national and international transportation networks، seismic design of quay walls is still an evolving topic in marine structural engineering. This study investigates the sensitivity of the gravity–type quay wall stability respect to uncertain soil and seismic properties using ultimate limit–sate pseudo–static design process. Stability is defined in terms of safety factor against sliding (sfs)، overturning (sfo) and exceeding bearing capacity (sfb). In order to assess the forces exerting on quay walls، to be more accurate، pore water pressure ratio، horizontal and vertical inertia forces، fluctuating and non–fluctuating components of hydraulic and soil pressure were considered. It was found that the increase of water depth in front of the quay، vertical and horizontal seismic coefficients، and pore water pressure ratio play important roles in reduction of all mentioned safety factors. Increase of specific weight of the rubble mound، backfill and foundation soil، friction angle of wall–foundation\seabed interface and wall back–face\backfill interface and friction angle of backfill soil، lead safety factors to magnify. A comprehensive sensitivity analysis was also performed using the tornado diagrams. Results of this study could give designers insights into the importance of uncertain soil and seismic factors، in order to choose geometry of the design in a way that its analysis and assessment is less relied on severely uncertain parameters and to introduce more reliable and economic quay walls.
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