A mixer nozzle assembly for mixing fluid introduced into a tank having a tank volume therein. A user may associate at least one group with content uploaded to a content database. The data generating unit switches, on the basis of an output from the motion sensor, a rate for generating the output data. The heat exchanger also comprises devices for feeding and distributing the caustic soda in the inside of the tube. A silicon nitride capping layer is applied over the polysilicon protection layer.