توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Control of Polysulfone Ultrafiltration Membrane haracteristics byChanging Molecular Weight of additives and UV Irradiation Parameters
نویسنده(ها): ، ، ،
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
Ultrafiltration (UF) membranes were prepared via phase inversion method. Casting solution contained polysulfone (PSf) \ N–methylen–2–pyrrolidone (NMP) \ poly(ethylene glycol) (PEG) and water was used as coagulant media. PEG with different molecular weight was used as pore–former. The effect of molecular weight of PEG on permeation properties was evaluated. It can be observed that an increase in the molecular weight of PEG additive leads to an increase in water permeability. The effects of irradiation parameters such as irradiation
time and monomer concentration were evaluated. The results show that by increasing the irradiation time and monomer concentration, rejection of the organic materials increases; although solution permeability decreases. Grafting of Acrylic Acid (AA) onto surface of membranes confirmed by Infra Red spectra (IR).<\div>

۲convergence of wieghted sums of r.v.s using sub – gaussian techniques
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس آمار ایران، سال
تعداد صفحات: ۴
In this paper we study some strong limit theorems for the sequence.<\div>

۳MORE EFFICIENT SHEAR BUILDING MODEL OF ECCENTRICALLY BRACED FRAMES
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله، سال
تعداد صفحات: ۸
Both structural and nonstructural damage sustained during earthquake ground motions are primarily produced by lateral displacements. Thus, the estimation of lateral displacement demands is of primary importance in performance–based earthquake–resistant design. Nonlinear time history analysis of a detailed analytical model may be the best option for the estimation of deformation demands. However, there are many uncertainties associated with the generation of site–specific input and with the analytical models presently employed to represent structural behavior. In many cases, the effort associated with detailed modeling and analysis may not be feasible; therefore, it is prudent to have a simpler analysis tool in order to assess the seismic performance of a frame structure. In this Paper the reliability of the pushover analysis has been verified by conducting nonlinear dynamic analyses on 5, 10 and 15 story EBF frames. It is shown that pushover analysis with predetermined lateral load pattern provides questionable estimates of inter–story drift. To overcome this inadequacy, a multistory frame is reduced to an equivalent shear building model. It is shown that the introduced shear building model can estimate the deformation demand of structures more exactly than nonlinear static procedure.<\div>

۴The second Kolmogorov’s inequality for independent fuzzy random variables
نویسنده(ها): ، ،
اطلاعات انتشار: یازدهمین کنفرانس سیستم های فازی ایران، سال
تعداد صفحات: ۶
In this paper the second kolmogorov's inequality for independent fuzzy random variables is obtained. Also kolmogorov's strong convergence theorem for H–fuzzy random variables is proved moreover some results on weak and strong law of large numbers for sums and weighted sums of independent fuzzy random variables is derived.<\div>

۵Effect of the Residence Time and Temperature on Asphaltene Deposition during CO2 gas Injection at Static Conditions
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۷
Asphaltenes are the heaviest constituents and most polar molecules in crude oil . Asphaltene deposition in reservoir , surface facilities and tubing can cause major problems during oil production , transportation and processing .Changes in reservoir parameters such as pressure, temperature and composition may cause asphaltene deposition from the crude oil. Therefore asphaltene can deposit during pressure, temperature and composition changes. Gas injection particularly CO2 gas, that is regarded as one of the most efficient methods of oil development, because of thermodynamic condition changes may cause asphaltene deposition which seriously influences production.This paper describes the effect of residence time and temperature on asphaltene deposition during CO2 gas injection to two Iranian oil samples(Ahwaz and Paydarshargh oil).The amount of asphaltene precipitation in the mixture of oil and CO2 gas was measured by using filtration . Then the experimental results were plotted as a graph and were accompanied with SEM images.<\div>

۶Effects of Nigella sativa L. Seed Oil in Type II Diabetic Patients: a Randomized, Double–Blind, Placebo – Controlled Clinical Trial
اطلاعات انتشار: گياهان دارويي، سال
تعداد صفحات: ۷
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