Effects of electric stimulation on acoustically - evoked responses in inferior colliculus

A fluidized bed combustion apparatus comprises a vessel in which a bed of fluidizable combustible and inert materials is supported, an inlet for a flow of fluidizing and combustion gas, an outlet for a flow of heated gas and gas swirling means located in the vessel between the fluidizable bed and the vessel outlet, the function of the gas swirling means being to retain any unburnt or only partially burnt materials in the vessel until combustion is complete.