In order to increase the distribution uniformity of sprinkler irrigation systems, some influential parameters such as wind speed, arrangement, space and type of sprinklers must be studied and controlled. In this study, a set of experiments were conducted based on ISO 7749/2(1990) standard to evaluate the ADF 250 and Nelson, F80APV sprinklers. To study the effects of wind velocity, operating pre...

Background and Objectives: Vitamin D deficiency is a major health concern in the world countries such as Iran. This study was carried out to compare effects of vitamin D supplements in doses of 50000 IU/month and 1000 IU/day on serum 25-hydroxy vitamin D (25(OH)D). Materials and Methods: In this triple-blind randomized controlled trial, 90 college students with serum 25(OH)D levels < 30 ng/ml w...