An apparatus includes a housing, a fill tube disposed within the housing, the fill tube having a fluid inlet at one end and a fluid outlet at another end. The target performance states to which the performance domains are to transition may be programmable in the PMU by software, and software may signal the PMU that a processor in the system is to enter the sleep state. The modifier oxide is supported on an inorganic oxide support or supports, where at least one of the inorganic oxide supports is an acidic support. The job manager may identify an invalid processing element included in the invalid segment. The sense amplifier reads out, from the test storage circuit, the test information selected by the decoder. In one variation, the passive structure further comprises a mass suspended within the piston from at least one spring, such that the mass oscillates under influence of movement of the piston at normal operating power and frequency so as to produce the restoring force.