A process to separate a multi-component hydrocarbon stream comprising ethylene, at least one polymer and other components includes flashing the multi-component hydrocarbon stream in a first flash stage from an elevated pressure of more than 30 bar and an elevated temperature in the range of 150\xb0 C. In one form, the invention relates to an improved signal processing method and apparatus for an iterative method of determining the reception of a signal in a multi user packet based wireless OFDM communication system. The external control device further comprises output circuitry configured for transmitting the stimulation parameters to the neurostimulation system. Next, unnecessary power consuming functions for the application demand are determined. Furthermore, the method may include determining, based at least in part on the first test event, a first state of the first test device. The apparatus also includes a liquid removal system having a conduit having an open end adjacent a volume in which liquid will be present, a porous member between the end of the conduit and the volume, and a suction device arranged to create a pressure differential across the porous member.