نتایج جستجو برای: and erosion

تعداد نتایج: 16832055  

Journal: :international journal of iron & steel society of iran 2014
m. atapour s. abdollahi s. m. monir vaghefi

in this work, the effect of erosion on corrosion behavior of coal tar epoxy coating was evaluated usingelectrochemical impedance spectroscopy (eis) measurements. the surface morphology of the coatingwas examined by scanning electron microscope (sem) after 10, 20, 30, 45 and 60 min of erosion processat an impact angle of 90º. after 10 min of erosion process, the nyquist plots showed just a singl...

سیستانی, مسعود , فتوحی, صمد , نگارش, حسین , نیک پور, نورالله ,

Has been stated in various sources, soil as one of the most important natural resources has a major, role on the lives of humans. Today soil erosion and sediment production, a problem that is increasing day to day process and loss of surface soils and sediment accumulation in dam reservoirs, canals and also sedimentation damage to the country's economy. One of the most important types of water ...

B. Rafiei M. Heydari S. Amini S. Khodabakhsh

Soil conservation and control of erosion is a basic problem in all countries. The goal of this research is to estimate erosion and sediment yield in Ekbatan Dam drainage basin by Erosion Potential Method (EPM), using Geographic Information System (GIS). The basin is located in Hamedan Province, west of Iran, in a cold and semi- arid region, with an average annual rainfall of 334mm. The study ar...

Journal: :iranian journal of otorhinolaryngology 0
mehrdad rogha department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. sayyed mostafa hashemi department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. farhad mokhtarinejad department of otorhinolaryngology, loghman hospital, shahid beheshti university of medical sciences, isfahan, iran. afrooz eshaghian department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran. alireza dadgostar department of otorhinolaryngology, kashani hospital, isfahan university of medical sciences, isfahan, iran.

introduction: cholesteatoma is traditionally diagnosed by otoscopic examination and treated by surgery. the necessity for imaging in an uncomplicated case is controversial. this study was planned to investigate the usefulness of a preoperative high-resolution computed tomography (hrct) scan in depicting the status of middle ear structures in the presence of cholesteatoma and also to compare the...

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The present study shows that very low erosion class (0.23 to 8 tons per hectare per year) Romeshgan watershed, most of the area to be included in the attrition levels low, medium, large and have too much. In general we can say the area is low to moderate ability erodible. SLEMSA model for estimating erosion, environmental conditions are examined. These factors in watershed erosion rates in diff...

Extended abstract 1- Introduction The degradation of natural resources in recent decades has led to increasing the erosion and an increase in the sediment production rates. Many activities are carried out at watershed level in order to control the destruction and decrease its effects. Assessment of watershed management projects is one of the most important issues performed today of implementa...

2012
Mehrad KAMALZARE Thomas F. ZIMMIE Christopher STUETZLE Barbara CUTLER W. Randolph FRANKLIN

The overall intent of this research is to develop numerical models of erosion of levees, dams and embankments, validated by physical models. The physical model tests were performed at 1-g and at high g’s using a geotechnical centrifuge facility. The erosion was modeled in detail, from beginning to end, that is from the time the levee was overtopped until the levee was breached. Typical quantiti...

Journal: :iranian journal of otorhinolaryngology 0
ghodrat mohammadi department of otorhinolaryngology, tabriz university of medical sciences, tabriz, iran masoud naderpour department of otorhinolaryngology, tabriz university of medical sciences, tabriz, iran mehrnoosh mousaviagdas department of otorhinolaryngology, tabriz university of medical sciences, tabriz, iran

introduction: the aim of this study was to evaluate the condition of the ossicular chain in patients requiring surgery for cholesteatoma.  materials and methods: in a retrospective analysis, the destruction of the individual and combined bony structures of the ear was described in 166 patients with cholesteatoma who went through surgery in our otology center between 2003 and 2009.  results: tot...

The goal of this study is determination of erosion rate and sediment production and exploring sensitive areas of erosion in Zemkan basin, located in the West of Kermanshah Province.To achieve these objectives, the erosion potential method (EPM) was used.Geographical information system also was used to reduce the errors and increase the relative accuracy in the analysis of the model. Required da...

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Erosion means the harvesting, transportation and movement of eroded material .The concept is very extensive erosion that has different definitions in different disciplines. The purposes of this paper is finding a brief definition of “erosion” concept in different perspectives and comparing it in Geomorphologic and Natural Resources point of views. To achieve this goal, we try to use the library...

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