A display apparatus and method for providing broadcast program information are provided. The high-temperature hard material is any or a mixture of cBN, TiC, TiN, TiAlN, TiB2, WC, Cr3C2, SiC, ZrC, VC, B4C, Si3N4, ZrO2, and Al2O3. A gear ring is mounted on and fixed to the drum face and gear teeth are formed on an outer circumference of the gear ring. The method further includes adjusting the proportion between current flow between said electrodes and current flow to the edge ground return path from said electrodes, to control plasma ion density distribution uniformity over the workpiece. In addition, the system includes a variety of features enhancing the performance of the apheresis system, including the interrelationship between the blood processing vessel and the blood processing vessel and the utilization of high packing factors for the procedure.