نتایج جستجو برای: empirical formula

تعداد نتایج: 293897  

Journal: :مرتع و آبخیزداری 0
علی شهبازی دانشجوی دکتری آبخیزداری، دانشکدة منابع طبیعی، دانشگاه تهران، ایران شهرام خلیقی سیگارودی استادیار دانشکدة منابع طبیعی، دانشگاه تهران، ایران آرش ملکیان استادیار دانشکدة منابع طبیعی، دانشگاه تهران، ایران علی سلاجقه استاد دانشکدة منابع طبیعی، دانشگاه تهران، ایران

in order to decrease the risks associated with the management of urban watersheds, the use of proper methods is an essential task to estimate the runoff with a high degree of confidence. time of concentration is one of factors that impacts on peak discharge and runoff volume. the objective of this study is to select the best method among the empirical formulas for estimating the time of concent...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه 1377

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

Journal: :Journal of the Illuminating Engineering Institute of Japan 1994

Journal: :Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry 1971

M. T. Kazemi,

Realistic prediction of concrete shrinkage and creep requires the calculation of the distributions of relative humidity at various times. Although the distributions of the relative humidity can be computed by numerical methods from the differential equation for diffusion, simple prediction formulas can facilitate structural analysis. The purpose of this paper is to present a simple formula for ...

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