Regulation of energy supplied to an electric motor from an energy supply system including a fuel cell and an energy storage buffer such as a battery, improves the dynamic response of the motor by adding current from the energy storage buffer to the current from the fuel cell during acceleration. The pathogen neutralization system is effective against a wide spectrum of pathogens, it incorporates commercially available components, and it can be readily integrated into commercial HVAC systems where it neutralizes airborne pathogens in large volumes of ventilated air in real time without any chemical reagents. If used for data sampling, a phase clock that lags the phase clock most in synchronization may be selected to appear at CLKOUT. The moving path of the ink cartridge is substantially normal to the longitudinal axis of the scan platform.