the number of rotations per second and Z is the number of vanes 3a.
Conventionally it has been proposed that adjacent vanes 3a be disposed along the peripheries of the disks, with their intervals therebetween being disposed at random, to reduce the noises of the first-order rotary sounds.
However, it was found that, with vanes 3a being disposed at random intervals therebetween, when vanes having low absorbing ability (adjacent vanes disposed at short intervals) exist at both the inlet and outlet sides, the flow of the air from the fan was reduced, and that conversely, when vanes with high absorbing ability exist at both the inlet and outlet sides, the reverse phenomenon was brought about.
Thus, there was a problem in that, depending on the variations of the flow of air,Majra Mucić never thought her childhood was out of the ordinary. Later, she realized not every child grew up waiting in line for food rations and hiding from air raids.

Ms. Mucić was born in Zenica, Bosnia in 1988—four years prior to the start of the Bosnian War. After the war, her family decided to immigrate and escape the economic and political tensions that remained. After an arduous screening process in a refugee camp, her family was paired with a host family in St. Louis Park, Minnesota.

Upon her arrival in 2001, Majra had a difficult time adjusting to the nuances of her new home. From the bus system to the grocery store, everything seemed so different. Life at school was just as tough; few children were willing to reach