List of Articles empirical method

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  1 - Doping finite-length carbon and boron nitride nanotubes with aluminium atom: A thermodynamic semiempirical investigation
  Nasrin Zeighami Asadollah Boshra Mohammad Reza Gholami Mehran Aghaie
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  2 - A Comparative Overview of Electronic Devices Reliability Prediction Methods-Applications and Trends
  Frederick Ehiagwina Titus Adewunmi Emmanuel Seluwa Olufemi Kehinde Nafiu Abubakar
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  3 - مقایسه روش‌های تجربی محاسبه تبخیر- تعرق پتانسیل در اقلیم نیمه مرطوب معتدل سرد (مطالعه موردی: شهرهای بروجن، شهرکرد، کوهرنگ و لردگان)
  کبری خیری شلمزاری امیر سلطان محمدی
  روش پیشنهاد شده برای محاسبه تبخیر تعرق پتانسیل روش فائو پنمن- مانتیث است اما روش های دیگری نیز وجود دارند که نیاز به داده های هواشناسی کمتر اما برآورد نزدیک به روش فائو پنمن مانتیث در شرایط اقلیمی مختلف را دارند. بررسی عملکرد این روش ها لازمه انتخاب آن ها به عنوان روش ج More

  روش پیشنهاد شده برای محاسبه تبخیر تعرق پتانسیل روش فائو پنمن- مانتیث است اما روش های دیگری نیز وجود دارند که نیاز به داده های هواشناسی کمتر اما برآورد نزدیک به روش فائو پنمن مانتیث در شرایط اقلیمی مختلف را دارند. بررسی عملکرد این روش ها لازمه انتخاب آن ها به عنوان روش جایگزین با توجه به داده های موجود می باشد. در این تحقیق مقادیر روزانه تبخیر تعرق پتانسیل در دوره زمانی 21 ساله (2015-1994 میلادی) با استفاده از روش های تجربی کوپایس، تورگ، هارگریوز، هارگریوز سامانی، ریتچی، ایرمک و سه شکل معادله والیانتز برای چهار ایستگاه بروجن، شهرکرد، کوهرنگ و لردگان محاسبه و با مقادیر محاسبه شده با روش فائو پنمن مانتیث مقایسه شد. برای مقایسه نتایج از ریشه میانگین مربعات خطا، خطای قدر مطلق و ضریب تبیین استفاده شد. نتایج نشان داد که معادله های ایرمک و والیانتز (RS, T,RH,U) بهتر از دیگر معادله‌های تجربی در هر چهار ایستگاه تبخیر- تعرق پتانسیل را برآورد کرد و معادله هارگریوز با 25/95 درصد خطای نسبی نسبت به معادله  فائو پنمن- مانتیث تخمین بسیار ضعیفی از تبخیر- تعرق پتانسیل را نشان داد. هچنین مقایسه مجموع تخمین‌های  حاصله از معادلات تجربی مشخص کرد که روش‌ های ایرمک و والیانتز (Rs,T, RH,U) به ترتیب برای همه ایستگاه ‌ها کارآمد ترین روش بودند. Manuscript profile
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  4 - Investigating the possibility of occurrence of geological hazards in the existing formations at the Hamrov tunnel
  Vahid Hosseinitoudeshki
  Knowledge of geological hazards plays an important role in the selection and installation of timely support system for underground structures.  The Hamrov tunnel with an approximate length of 1294 meters in the main way of Sanandaj- Marivan is under construction. B More

  Knowledge of geological hazards plays an important role in the selection and installation of timely support system for underground structures.  The Hamrov tunnel with an approximate length of 1294 meters in the main way of Sanandaj- Marivan is under construction. Based on the geo-mechanical conditions of rock masses in the tunnel, it is necessary to investigate the possible geological hazards such as squeezing. In this study, using geological surveys and drilling of boreholes, the way of the tunnel been divided into different units and then the severity of squeezing in each section have been investigated. By comparing the different methods of squeezing evaluation, it was found that the empirical Hoek-Marinos method evaluate the minimum of squeezing and the Jethwa method evaluate the maximum of squeezing for the rock masses of the tunnel. The utmost squeezing potential is related to section of the tunnel where there is the alternation of sandy shale and limestone with shale. According to the survey, the Hamrov tunnel is divided into three sections: A (km 5293 to 5543) with squeezing extreme serious to serious, B (km 5543 to 5973) with squeezing severe to very low, and C (5973 to 6133 km) almost without risk of squeezing.   Manuscript profile
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  5 - Prediction of ground settlement induced by mechanized excavation in the Tehran Metro tunnel
  Saeed. hosseini Korosh. shahriar Masoud. monjezi MohammadReza. Bitarafan
  The main issue of tunnelling in urban environment is the prediction of the ground settlements induced by tunnelexcavation, which may cause damage to surface structures. In this paper are used empirical, analytical and threedimensional finite element methods (by ABAQUS p More

  The main issue of tunnelling in urban environment is the prediction of the ground settlements induced by tunnelexcavation, which may cause damage to surface structures. In this paper are used empirical, analytical and threedimensional finite element methods (by ABAQUS program) for the prediction of ground settlements inducedduring tunnel construction using EPB (earth pressure balance) excavation machine in part of the line 3 of Tehransubway. The results indicate that the three-dimensional FEM predicts a more realistic surface settlement value,and settlement profiles from empirical and analytical methods are narrower than numerical one. Moreover, themaximum predicted settlement by three methods is more than its suggested allowable value. Manuscript profile
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  6 - Investigation of effective parameters (pipe diameter and fluid velocity) on the Simulation of water hammer phenomenon in water pipeline
  Nima Asadi Dehmirahmadi Yousof Esmaeili
  Due to the importance of water hammer in pipe network and pipe containing liquids in this paper, the diameter of pipe and the velocity of fluid were considered experimentally in laboratory and simulated the problem in HAMMER software. In this study, the tests were carri More

  Due to the importance of water hammer in pipe network and pipe containing liquids in this paper, the diameter of pipe and the velocity of fluid were considered experimentally in laboratory and simulated the problem in HAMMER software. In this study, the tests were carried out with six different types of materials (Brass, Carbon Steel, Copper, Five layer and PVC). It was assumed that valve which causes water hammer was closed fast. Also, how valve closing, is another important issue for this phenomenon. The tests in two modes slow and fast closing valve results showed if it takes more time to close, water hammer is less and the waves would fade faster. Also by examining the results indicate that the diameter of the pipes increasing pipe's diameter, increases the mess flow and fluid's velocity therefore effect of water hammer increases. This phenomenon shows that effect of increasing fluid velocity is more powerful than increasing pipe diameter. Manuscript profile
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  7 - Empirical methods Comparison of estimation evaporation From Free Water Surface (Case Study: Dez Regulatory Dam)
  Mehdi Najafvand Derikvandi Hossein Eslami
  Evaporation is an important factor in the management of water resources and accurate calculation can be effective strategies to mitigate the effects of drought and implemented in order to protect water resources. Due to lack of evaporation stations and lack of adequate More

  Evaporation is an important factor in the management of water resources and accurate calculation can be effective strategies to mitigate the effects of drought and implemented in order to protect water resources. Due to lack of evaporation stations and lack of adequate data, empirical methods can be used to estimate evaporation from water surface. In this study, evaporation estimated using 10-year data of Dez adjustment dam station and empirical methods of Mayer, Marciano, Shahtin, Hefner, Ivanof, Tichomirof and USBR and the estimated evaporation compared with pan evaporation values. Based on the R2 and RSME statistics, empirical methods were evaluated. The results showed that the relationship Mayer (R2 = 0.886, RMSE = 1.53) than other experimental methods is more accurate. The USBR equation (R2 = 0.91, RMSE = 1.967) lie in next rank and also a significant difference (P> 0.01) is not seen between actual and estimated values in two ways. Tichomirof method due to significant error (RMSE = 8.152) and lower fitted to actual data (R2 = 0.33) is the lack of credibility and Hefner, Marciano, Ivanof and Shahtin with a determination coefficient equal to 0.548, 0.534, 0.639 and 0.664 have modest validity and reliability for estimating the amount of evaporation from water surface. Manuscript profile
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  8 - Geotechnical-Geological studies and tunnel support design at Rudbar-Lorestan dam site, Iran
  Saeed Masoud Shamsoddin Parviz Maarefvandz
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  9 - Matrix analysis of corrosion inhibition phenomena: Theoretical technique for inhibitor prediction and pre-selection
  Mohsen Lashgari Mohammad-Reza Arshadi Gholam-Abbas Parsafar
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