The present invention provides a process of preparing particulate products, the process comprising the steps of printing a liquid precursor of a non-metal particulate onto or into a collecting substrate and recovering non-metal particulates. Only those fields that are affected by the command will be changed. The second group provides body potentials for the transistors if the inverter circuit belongs to an odd numbered stage. The processing means receives and processes the movement signals to derive a classification of individual breaths using, for each breath, the respective phase andor amplitude of each movement sensor signal within the set for that breath.