نتایج جستجو برای: radiation models

تعداد نتایج: 1129070  

Journal: :آب و خاک 0
علی اکبر سبزی پرور بهناز ختار

introduction: solar net radiation (rn) is one of the most important component which influences soil heat flux, evapotranspiration rate and hydrological cycle. this parameter (rn) is measured based on the difference between downward and upward shortwave (sw) and longwave (lw) irradiances reaching the earth’s surface. field measurements of rn are scarce, expensive and difficult due to the instrum...

Journal: :The Open Plasma Physics Journal 2014

Maryam Naji Mehdi Momen-Nejad Mohsen Hajizadeh Seyed Rasoul Zakavi,

  Introduction: Ordered subset expectation maximization (OSEM), is an effective iterative method for SPECT image reconstruction. The aim of this study is the evaluation of the role of system matrix in OSEM image reconstruction method using four different physical beam radiation models with three detection configurations. Methods: SPECT was done with an arc of 180 deg...

Background and Objectives: Although Boilover occurs with a low frequency, but in case of occurrence, it can cause severe damage to people and equipment around the tank. The prediction of the fireball of Boilover phenomenon has an important role to play in adopting appropriate strategies for fire suppression of the atmospheric storage tank. The purpose of this study is to predict the consequence...

Journal: :Environmental Health Perspectives 1987

ژورنال: علوم آب و خاک 2010
بهبهانی, سید محمد رضا, جمشیدی, محبوبه, رحیمی خوب, علی,

Daily solar radiation intercepted at the earth’s surface is an input required for water resources, environmental and agricultural studies. However, the measurement of this parameter can only be done in a few places. This has led researchers to develop a number of methods for estimating solar radiation based on frequently available meteorological records such as hours of sunshine or air temperat...

ژورنال: علوم آب و خاک 2015
بابایی حصار, سحر, عرفانیان, مهدی,

Concerning the drying problem of the Lake Urmia in Iran, so far the relevant scientific research has not been conducted based on watershed management principles. The surface solar radiation (Rs) is one of the key input parameters in most of reference evapotranspiration (ET0) prediction models. In the present research, four solar radiation models were evaluated to predict the monthly-mean values...

ژورنال: علوم آب و خاک 2009
بانژاد, حسین, تفضلی, فرزین, زارع ابیانه, حمید, سبزی پرور, علی اکبر, غفوری, محمد, مریانجی, زهره, موسوی بایگی, محمد,

Under different climatic conditions of Iran, the evaluation of evapotranspiration (ETo) models sensitivity to meteorological parameters, prior to introducing the superior performance model, seems quite necessary. Using a 35-year (1971-2005) climatological observations in Hamedan, this study compares the sensitivity of different commonly used evapotranspiration models to different meteorological...

A Mesbahi, B Nasiri Motlagh H Ozan Tekin M Mohammadzadeh N Rasouli

Purpose: In the current study, using different radiobiological models, tumor control probability (TCP) and normal tissue complication probability (NTCP) of radiotherapy plans were calculated for three-dimensional conformal radiation therapy (3D-CRT) and intensity modulated radiation therapy (IMRT) of prostate cancer.Methods and Materials: 10 prostate plans were randomly selected among patients ...

Hassan Ghasemi Mobtaker, Mansour Matloobi Morteza Taki Seyed Faramarz Ranjbar Yahya Ajabshirchi

Precise knowledge ofthe amount of global solar radiation plays an important role in designing solar energy systems. In this study, by using 22-year meteorologicaldata, 19 empirical models were tested for prediction of the monthly mean daily global solar radiation in Tabriz. In addition, various Artificial Neural Network (ANN) models were designed for comparison with empirical models. For this p...

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