توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Efficient alkaloids extraction of eggplant for producing two types of antibacterial and anti–fungal gels
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
The principle constituent available in eggplant was an alkaloid which was prepared as an antibacterial and an antifungal gels. The quantitative
determination of the alkaloid was conducted by continuous extraction method using an extractor with 95% by weight of alcohol and chloroform s
solvent for 3–5 hours. The menstrum was treated with 1% by weight of HCl and ammonia, in order to purify the alkaloid that was dissolved in the menstrum. When it was tested chemically, it gave a positive test for alkaloid, so its effectively was tested microbiologically. Zones of inhibition were observed by using staphylococcus aureus, escherichia coli and candida albican as the test organisms. Therefore, acquired alkaloid was used as active component in the preparation of two effective gels, by incorporating with white base from the official formula.<\div>

۲Performance and phase change studies of promoted and aged Fe–Zn–K catalyst, having simultaneous base and promoting effects of Zn, for Fischer–Tropsch–Synthesis
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۲۰
The Fe–Zn–K catalyst is a promoted catalyst by potassium and its base can also play the role of the catalyst promoter. The performance of this aged catalyst and two other identical catalysts was studied and discussed in order to describe the dual effects of zinc in production of ethylene and propylene. The optimum conditions of their performance in Fischer–Tropsch–Synthesis (FTS) were determined. Also, scanning electron microscopy (SEM) and X–ray diffraction (XRD) techniques related to the phase and elutriation changes were studied, which were as a result of changing the ageing time of the Fe\Zn\K precursors and the catalysts. In addition the effects of the potassium increase on the textures of the Fe\Zn precursor and catalyst were studied. The crystalline structure of the main catalyst Fe\Zn\K, with an ageing time 1 hour, was also studied using the XRD technique.<\div>

۳Prediction of effluent products temperature from mixed reactors of methane chlorination
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۱
Methane can adiabatically react in a mixed reactor . Reactor feed temperature is 25 C o and the residence time is enough for the existing
chlorine in the feed to be changed into chlorinated products . In the calculations , the assumption was that the gaseous mixture was ideal
and all reactions were irreversible. We used from heat of formation data to calculate heat of reactions per each mole of chlorine while reactioning in 25 C o . We assumed that the reactor volume was proper for the chlorine to be cunsumed in the reaction . Our main intention was to determine following parameters in the calculations : rate equations , stoichiometric correlations and energy balance equation . An average heat capacity for feed components of 4 CH and 2 Cl was used in the calculations . We used the linear interpolation method in which T performs as an independent variable . Then a modified T was obtained via the linear interpolation on the temperature function of heat capacity . In the first guess , the calculations were based on 100 moles of the feed . The same procedure was used for the second estimation . At last we considered the third guess in order to calculate the output temperature and the final results were obtained.<\div>

۴Syngas conversion:Reactors, Mechanisms and Catalysts
نویسنده(ها): ، ،
اطلاعات انتشار: دهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
In this research first we studied different Fischer–Tropsch–Synthesis(FTS)reactors And their structures, notably fixed – bed, entrained – bed ,slurry and fluidized – bed reactors , each having some weaknesses and advantages. Then we will consider the process mechanisms which are proposed by the researchers. The best and the most similar one to FTS can be compared and selected. Finally various FTS catalysts are considered and their products are compared in quality and quantity. Additionally the methods of provision and the promoter materials are reviewed and discussed comparatively.<\div>

۵Investigation of Solid Waste Disposal Alternatives in Lavan Island Using Life Cycle Assessment Approach
نویسنده(ها): ، ، ، ، ، ، ، ، ، ، ، ،
اطلاعات انتشار: International Journal Of Environmental Research، هفتم،شماره۱، Winter ۲۰۱۳، سال
تعداد صفحات: ۱۰
Escalating development of tourism and petroleum industries in small islands such as Lavan–Iran requires sound solid waste management. In the present investigation, three scenarios which consist of the combination of landfill, recycling, incineration and composting and their environmental impacts have beenevaluated for 7514 Kg\day of waste generation in Lavan island. For this purpose, life cycle assessment was used. The environmental impact assessment was carried out by Eco–indicator 99. The impacts include health (organic substances, inorganic substances, climate change, ionizing radiation, and ozone layer depletion),ecosystem quality (ecotoxic emissions, acidification, eutrophication and double coating) and resources (extraction of minerals and the fossil fuels). Although all three scenarios have positive impacts on the environment, the third one causes the least damage. Introduced Scenario one has the most adverse effects on human health and ecosystem quality. However, introduced scenario Two has less than the others. In general, the effects of scenario three (landfilling plus recycling, incineration and composting) is less than the other two scenarios which makes it a better candidate for further investigations.

۶Spatial variability and estimation of tree attributes in a plantation forest in the Caspian region of Iran using geostatistical analysis
نویسنده(ها): ، ، ،
اطلاعات انتشار: Caspian Journal of Environmental Sciences، هشتم،شماره۲، ۲۰۱۰، سال
تعداد صفحات: ۱۰
This research was conducted to investigate spatial variability and estimate tree attributes in a plantation forest in the Caspian region of Iran using geostatistical analysis. Sampling was performed based on a 50m?125m systematic grid in a maple stand (Acer velutinum Boiss) 18 years of age using circular samples of 200m2 area. Totally, 96 sample plots were measured in 63 hectares and 14.25 hectare was inventoried as full census area. Experimental variograms for forest stem basal area, stem density and tree height attributes were calculated and plotted using the geo–referenced inventory plots. The calculated variograms of basal area and height showed a high spatial auto–correlation, which is fitted by spherical model. However, stem density showed a large nugget effect. Estimations for basal area and height interpolated by ordinary block kriging and cross validation results showed that all the estimations were accurate. Furthermore, the estimated kriged mean of basal area showed no significant difference to the real mean in the full census area. Therefore, geostatistical analysis is able to capture and explain the spatial variability as well as estimate tree attributes (not stem density) in this kind of plantation forest, accurately.
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