A track system for high density mobile storage comprises parallel tracks each receiving a rail on which mobile carriages roll. A Performance Monitor Daemon provides one non-blocked thread pair per processor to support a large number of connections. The first PWM signal, derived from the input signal, controls first and third switches of the electrical bridge circuit. Other embodiments are also described and claimed. The products of present process find utility as polymerization regulators andor light stabilizers for organic material . At least two fastening elements are arranged circumferentially to extend axially from the peripheral wall.