نتایج جستجو برای: empirical correlations

تعداد نتایج: 315978  

Journal: :Journal of Petroleum Exploration and Production Technology 2013

Journal: :journal of chemical and petroleum engineering 0
kamyar movagharnejad prof. of chemical eng., thermokin. dept.,chemical eng. faculty, babol university of technology, babol. soraya ghanbari ms. student of chemical eng., thermokin. dept.,chemical eng. faculty, babol university of technology, babol.

numerous empirical correlations exist for the estimation of crude oil viscosities. most of these correlations are not based on the experimental and field data from iranian geological zone. in this study several well-known empirical correlations including beal, beggs, glasso, labedi, schmidt, alikhan and naseri were optimized and refitted with the iranian oil field data. the results showed that ...

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 King Saud University - Engineering Sciences 1993

The examination of available vapor pressure data in the case of the methane, ethane, propane and butane halogenated refrigerants, allowed recommendations of standard equations for this property. In this study, three new models include a general correlation; a substance-dependent correlation and an artificial neural network (ANN) approach have been developed to estimate the saturated vapor press...

Journal: :physical chemistry research 0
amir homayoon meghdadi isfahani young researchers and elite club, najafabad branch, islamic azad university, najafabad, iran mehdi reiszadeh chemical engineering department, shahreza branch, islamic azad university, shahreza, iran somaye yaghoubi koupaye department of mechanical engineering, najafabad branch, islamic azad university, najafabad, iran mehrdad honarmand department of mechanics, tiran branch, islamic azad university, isfahan, iran

the examination of available vapor pressure data in the case of the methane, ethane, propane and butane halogenated refrigerants, allowed recommendations of standard equations for this property. in this study, three new models include a general correlation; a substance-dependent correlation and an artificial neural network (ann) approach have been developed to estimate the saturated vapor press...

ژورنال: اندیشه آماری 2021

In this paper, we first define longitudinal-dynamic heteroscedastic hierarchical  normal  models. These models can be used to fit longitudinal data in which the dependency structure is constructed through a dynamic model rather than observations. We discuss different methods for estimating the hyper-parameters. Then the corresponding estimates for the hyper-parameter that causes the association...

Journal: :World Journal of Nuclear Science and Technology 2019

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