In this paper, a new step-upresonant DC-DC converter without an auxiliary switch is introduced. All the switching elements act under zero current switching condition at turn-on and turn-off instants. The proposed converter has a simple auxiliary circuit including an inductor and a capacitor. In addition, the size of the main inductor is considerably reduced because it acts as a resonant inducto...

1.0 overview it seems that grammar plays a crucial role in the area of second and foreign language learning and widely has been acknowledged in grammar research. in other words, teaching grammar is an issue which has attracted much attention to itself, and a lot of teachers argue about the existence of grammar in language teaching and learning. this issue will remind us a famous sentence f...

gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...

Survey on the prevalence of occlusal interferences in central relation in posterior crowns Dr. V. Karimi * - Dr. Z. Mahdavi Izadi ** - Dr. F. Karimi *** - Dr. H. Soori**** * - Dentist ** - Assistant Professor of Fixed Prosthodontics Dept. - Faculty of Dentistry – Tehran Islamic Azad University. *** - Assistant Professor of Medical Sciences Research National Center. **** - Associate Professor of...