in this research we have studied the effect of some transition-metals (cu, ag and au) substitutions on two-electron reduction potential of flavins by application of dft method. all geometries have been optimized at blyp level of theory and “6-31+g** + lanl2dz” mixed basis set. the frequency job at the same method and basis sets has been performed to obtain gibbs free energy of compounds. it h...

this study investigates the strategies native english and persian speakers employ for expressing gratitude in different situations. the strategies of persian efl learners are also compared with english strategies in order to find the differences that may exist between these two languages. social status and size of imposition of the favor are social variables which are investigated in detail for...

in civil engineering concrete is a material combined of hydraulic cement, sand, gravel and water. gravel and sand compose 60 to 70 percent of concrete. these aggregates support compression force of concrete. cement paste acts as glue to stick grain together. in bushehr factories producing aggregates do not operate according to astm standards, so that fineness modulus (fm) of the produced sands ...

this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...

نهج البلاغه به جهت برخورداری از واژگان غنی ، تناسب لفظ و معنا و اسلوب های گوناگون بلاغی نمونه ی برجسته بلاغت در ادبیات عربی است .در این پژوهش سعی شده است نامه 31 نهج البلاغه به عنوان نمونه ای از این مجموعه ی نفیس براساس قواعد بلاغت در 2 محور بیان و بخشی از بدیع مورد بررسی و تجزیه و تحلیل قرار گیرد .در این پایان نامه مشخص می شود که استعاره بیشترین بخش این نامه را به خود اختصاص داده است . آن حضرت...