BACKGROUND A 24-year-old woman with symptoms of chronic, recurrent headache, presumably secondary to migrainous etiology, came to our clinic and was found to have a congenital retinal macrovessel encircling an area superior to (but not passing through) the macula. CONCLUSIONS Congenital retinal macrovessels are rare, aberrantly large branches of retinal arteries or veins that typically cross ...

in this research, the appropriateness of drainmod-n model was evaluated for the simulation of nitrate transport with subsurface drainage in paddy fields. during a canola growing season from november 2011 to april 2012, the nitrate concentration of drainage water and soil saturation extracts of two depths of 30 and 60 cm was measured in consolidated paddy fields of sari agricultural sciences and...

iran is ranked fourth for saline-sodic soils in asia following china, india and pakistan. therefore, if coupled with waterlogging, drainage would be an inevitable and indispensable activity agriculture in most irrigated parts of iran. drain installation depth is one of the main economic as well as environmental challenges in design and construction of drainage systems. deep pipe drain installat...

It is known that rainwater infiltration crucial for rainfall-induced slope failure because the infiltrated water can significantly weaken shear strength of unsaturated soil. Horizontal drains are commonly used to provide appropriate drainage percolates out a slope. However, effects length and location subsoil pipe on performance horizontal have not been extensively investigated. In this paper, ...

Elite migration and brain drain trend in Iran have undergone a dramatic ascent in the past few decades while we are seriously in need of educated manpower to help accomplish the 20-year national vision. So to consider brain drain is necessary and must be accounted by policymakers in all levels. In the upcoming paper, we study the brain drain as a social problem and elaborate a five-dimensional ...

elite migration and brain drain trend in iran have undergone a dramatic ascent in the past few decades while we are seriously in need of educated manpower to help accomplish the 20-year national vision. so to consider brain drain is necessary and must be accounted by policymakers in all levels. in the upcoming paper, we study the brain drain as a social problem and elaborate a five-dimensional ...