A fuel cell system is provided including a fuel cell stack having a first end and second end. A low frequency component and a high frequency component is taken from an input signal. The channels may be angled into the direction of rotation of the rotors to direct crushed material therethrough. Also provided is a chiral high performance liquid chromatography method to separate enantiomers of metal complexes. When at least one defective area is detected in the user data area, the defect list is used to manage the at least one defective area. When the calculated deviation exceeds a predetermined value, a current limit decision unit sends a limit signal to a current limiting unit.