this thesis is presented 10 ghz voltage controlled ring oscillator for high speed application. the voltage controlled ring oscillator was designed and fabricated in 0.13یm cmos technology. the oscillator is 7-stages ring oscillator with one inverter replaced by nand-gate for shutting down in the ring oscillator during idle mode. tri-state inverter was used to control of 126 bit vector in ri...

in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...

This research is a descriptive analytical study which been carried out for the purpose of study of application period, causes of the discontinuation and the problems arising from the application of the edible pills as a pregnancy preventive method among the women of Tehran (1989). 986 women have been studied in two groups as follows: A) The women who have used the edible pills (737 women). B) T...