Abstract: There is disclosed a method of operating a gas turbine engine of a type having a compressor section, a combustor section, and a turbine section arranged in flow series. The method involves the steps of: providing a supply of cryogenic liquid fuel; vaporising the cryogenic liquid fuel to produce a gaseous fuel; expanding said gaseous fuel in at least one fuel turbine external to the engine's turbine section; and thereafter directing said expanded gaseous fuel into the engine's combustion section for combustion therein. A related gas turbine arrangement configured for implementation of the method is also disclosed.

Abstract: An electronic apparatus such as a digital wide area pager has a receiver IC (10) capable of operating directly from a single cell battery (24) for as long as the terminal voltage (V.sub.BAT) is above a specified minimum voltage. Other ICs (14, 16) of the pager operate at a higher voltage supplied by a multiplier (26) connected to the battery (24). The multiplier (26) is able to operate at values of V.sub.BAT below the specified minimum voltage. A control circuit (34) determines when the terminal voltage (V.sub.BAT) decays below the specified minimum voltage and supplies the receiver IC (10) with a stepped-down voltage from the multiplier (26) to ensure its sensitivity remains acceptable.