A breast milk absorbent pad includes side flaps of a breast milk absorbent pad having first portions facing the wearer’s skin and second portions facing away from the wearer’s skin. The position detecting pattern has a first light transmitting portion for transmitting the light from the light emitting portion and a first light interception portion for intercepting the light from the light emitting portion which are alternately arranged in a detection range of the object. A first pole piece extends into one end of the tube and a second pole piece extends into another end of the tube. A system comprising fast pyrolysis means producing a pygas and char, independent catalytic conversion means downstream of the fast pyrolysis for converting the pygas to hydrocarbons, and a hydrogen source, external to the system andor produced by a steam reformer by steam reformation of at least a portion of the hydrocarbons, coupled to catalytic conversion means, also are described.