A first connector includes: a first housing ; and a pair of rotary members supported on the first housing for rotating in opposite directions to each other. The signals are transmitted using a low density parity check code. A control circuit is provided for controlling the main and auxiliary current supplies and the main coil assembly, the B0 shim coil assembly and the control circuit are adapted to at least partly compensate for the effect of variation of the magnetic field within the working volume with time. The dispenser aims at reducing power consumption while providing improved reaction time when required to dispense paper. Applications may include but are not limited to viral infections, other intracellular infections, cancers, vector-borne diseases, autoimmune diseases, cellular diseases, cellular enhancement, and research.