An AGC control unit coordinates AGC gain changes between individual receive chains included within a MIMO receiver block. The top member comprises downward projecting ribs which are located on its underside. The use of the catalyst enables the synthesis of glycerol carbonate from glycerol and urea with high conversion rate, selectivity and yield. The journal rotates directly in, but independently of, the sliding block. In a kit aspect of the present invention, a kit for delivering a stimulant through an inhalation route is provided which comprises: a) a coating of a stimulant drug and b) a device for dispensing said coating a stimulant as a condensation aerosol. When data is transferred from an input queue, a ring buffer, to the group of processors, an identifier adding unit adds an identifier to the data as a tag, the identifier indicating a block that contains this data in the input queue.