نتایج جستجو برای: artificial neural network transformer loss and life

تعداد نتایج: 17087938  

Journal: :Energies 2021

Frequency response analysis (FRA) is a well-known method to assess the mechanical integrity of active parts power transformer. The measurement procedures FRA are standardized as described in IEEE and IEC standards. However, interpretation results far from reaching an accepted definitive methodology there no reliable code available standard. As contribution this necessity, paper presents intelli...

2008
Ankireddypalli S. Reddy M. Vijaykumar

Power transformers represent the largest portion of capital investment in transmission and distribution substations. In addition, power transformer outages have a considerable economic impact on the operation of an electrical network. One of the most important parameters’ governing a transformer’s life expectancy is the hot-spot temperature value. Due to under estimation of stray losses in powe...

Journal: Pollution 2015

Bedload transport is an essential component of river dynamics and estimation of its rate is important to many aspects of river management. In this study, measured bedload by Helley- Smith sampler was used to estimate the bedload transport of Kurau River in Malaysia. An artificial neural network, genetic programming and a combination of genetic programming and a neural network were used to estim...

Journal: :middle east journal of cancer 0
shahram paydar trauma research center, shahid rajaee (emtiaz) trauma hospital, shiraz university of medical sciences, shiraz, iran saeedeh pourahmad department of biostatistics, shiraz university of medical sciences, shiraz, iran mohsen azad department of biostatistics, shiraz university of medical sciences, shiraz, iran shahram bolandparvaz trauma research center, shahid rajaee (emtiaz) trauma hospital, shiraz university of medical sciences, shiraz, iran reza taheri department of neurosurgery, shiraz university of medical sciences, shiraz, iran zahra ghahramani trauma research center, shahid rajaee (emtiaz) trauma hospital, shiraz university of medical sciences, shiraz, iran

background: clinically frank thyroid nodules are common and believed to be present in 4% to 10% of the adult population in the united states. in the current literature, fine needle aspiration biopsies are considered to be the milestone of a model which helps the physician decide whether a certain thyroid nodule needs a surgical approach or not. a considerable fact is that sensitivity and specif...

ژورنال: علوم آب و خاک 2019

Estimation of evapotranspiration is essential for planning, designing and managing irrigation and drainage schemes, as well as water resources management. In this research, artificial neural networks, neural network wavelet model, multivariate regression and Hargreaves' empirical method were used to estimate reference evapotranspiration in order to determine the best model in terms of efficienc...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1389

abstract present research considered to examine and compare shahrray 14 years girls and boys narrative concerning with their responsibilities in this research, statistical society are 14 years girls and boys of shahrry . for performing this research. first, 14 years of 50 boys and 50 girls were selected in accidental method and have filled memati hormaled adolescents responsibility questioner...

In this study, an artificial neural network was developed in order to analyze flexible pavement structure and determine its critical responses under the influence of standard axle loading. In doing so, more than 10000 four-layered flexible pavement sections composed of asphalt concrete layer, base layer, subbase layer, and subgrade soil were analyzed under the impact of standard axle loading. P...

A Geranmayeh F Ghobadi H Rezaei M Bashiri

Most of existing researches for multi response optimization are based on regression analysis. However, the artificial neural network can be applied for the problem. In this paper, two approaches are proposed by consideration of both methods. In the first approach, regression model of the controllable factors and S/N ratio of each response has been achieved, then a fuzzy programming has been app...

Journal: :environmental health engineering and management 0
ali akbar mohammadi department of environmental health engineering, neyshabur university of medical sciences, neyshabur, iran mansour ghaderpoori department of environmental health engineering, faculty of health and nutrition, lorestan university of medical sciences, khorramabad, iran mahmood yousefi students research committee, neyshabur university of medical sciences, neyshabur, iran malihe rahmatipoor students research committee, neyshabur university of medical sciences, neyshabur, iran safoora javan students research committee, department of environmental health engineering, neyshabur university of medical sciences, neyshabur, iran

background: one issue of concern in water supply is the quality of water. measuring the qualitative parameters of water is time-consuming and costly. predicting these parameters using various models leads to a reduction in related expenses and the presentation of overall and comprehensive statistics for water resource management. methods: the present study used an artificial neural network (ann...

Journal: :gas processing 0
hamidreza yousefi department of petroleum engineering, amirkabir university of technology, iran ebrahim shamohammadi department of petroleum engineering, amirkabir university of technology, iran ehsan khamehchi department of petroleum engineering, amirkabir university of technology, iran

gas hydrates are a costly problem when they plug oil and gas pipelines. the best way to determine the hft and pressure is to measure these conditions experimentally for every gas system. since this is not practical in terms of time and money, correlations are the other alternative tools. there are a small number of correlations for specific gravity method to predict the hydrate formation. as th...

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