In one embodiment, a method of scheduling transmissions for a base station in a multi-carrier wireless communication network comprises scheduling initial transmissions of data packets for one or more users on a first carrier, without reserving scheduling capacity on the first carrier for retransmissions. The method can include introducing particulates to a heat exchanger containing a tube bundle having a plurality of tubulars, introducing a coolant to the plurality of tubulars through a coolant inlet, flowing the particulates through the shell side of the heat exchanger, and contacting at least a portion of the particulates with the tube bundle. The dispenser also includes a tray that supports the airlaid web roll and includes an outlet opening through which the airlaid web is fed to be accessible to a user. Moreover, the flow formed by the stirring goes from the gas-liquid interface where a source gas concentration is high to the inside of the material solution where the source gas concentration is low, so that dissolution of the source gas becomes uniform. The power interconnection line connected to the opposite electrode contact portion includes a first interconnection layer and a second interconnection layer which are stacked without an insulating layer therebetween.