A conveyor system includes a plurality of antennas proximate a conveyor path of travel that radiate radio frequency signals into a first area and receive responses to radio frequency signals from radio frequency identification tags on items on the conveyor. Included is one or more head assemblies each including a base with a row bar coupled thereto with a head situated therein for defining a tape bearing surface defining a tape wrap angle with respect to a horizontal plane. The ventilation duct has a flange formed at one end thereof connected with the back glass substrate. The immiscible material is chemically etched from the phase separated composite particles to form porous, amorphous lithium storage material particles. The head of one of the screw or nut is designed to prevent displacement and rotation of the barking tool. A recursive motion estimation module works in conjunction with a non-recursive motion estimation module to provide candidate motion vectors to a selection module.