A knob for installation on circular and non-circular shafts. The processes comprise esterifying acetic acid and an alcohol such as ethanol to produce an esterification product. If a source mobile subscriber unit communicates with a destination unit through wide area wireless network coverage, the source mobile subscriber unit is handed over to ad hoc wireless network coverage either automatically or upon the occurrence of a high frame error rate when it enters the neighborhood cell to maintain communication with the destination unit. The membrane electrode assembly including the supported catalyst and a fuel cell including the membrane electrode assembly each show excellent output density and high performance.