Abstract: Provided are: a useful bed medium for a fluidized bed with good fluidity, the bed medium being usable in a fluidized bed furnace using biomass material and coal material as fuel; and a useful bed medium for a fluidized bed with good durability, the bed medium not easily forming an agglomerate of its particles, and being resistant to collapsing. The bed medium for a fluidized bed in a fluidized bed furnace for combusting or gasifying the fuel is formed of artificially-produced spherical refractory particles containing not less than 40% by weight of Al2O3 and not more than 60% by weight of SiO2 and having an apparent porosity of not more than 5%, and a ratio by weight of agglomerated particles in the bed medium is not more than 20% after three heat treatment tests on the bed medium at 900° C. for 2 hours under coexistence with the fuel.

Abstract: Provided are: a useful bed medium for a fluidized bed with good fluidity, the bed medium being usable in a fluidized bed furnace using biomass material and coal material as fuel; and a useful bed medium for a fluidized bed with good durability, the bed medium not easily forming an agglomerate of its particles, and being resistant to collapsing. The bed medium for a fluidized bed in a fluidized bed furnace for combusting or gasifying the fuel is formed of artificially-produced spherical refractory particles containing not less than 40% by weight of Al2O3 and not more than 60% by weight of SiO2 and having an apparent porosity of not more than 5%, and a ratio by weight of agglomerated particles in the bed medium is not more than 20% after three heat treatment tests on the bed medium at 900° C. for 2 hours under coexistence with the fuel.

Abstract: A control unit makes a connection state between a connection device connected to a connection management device and an electronic device when a determination unit determines that identification information of the connection device connected to the connection management device has been registered in a connection work plan and a connection history of a connection order preceding a connection order of the connection device is “connected”, and does not make the connection state between the connection device connected to the connection management device and the electronic device when it is determined that the connection history of the connection order preceding the connection order of the connection device is “unconnected”.

Abstract: A control unit makes a connection state between a connection device connected to a connection management device and an electronic device when a determination unit determines that identification information of the connection device connected to the connection management device has been registered in a connection work plan and a connection history of a connection order preceding a connection order of the connection device is “connected”, and does not make the connection state between the connection device connected to the connection management device and the electronic device when it is determined that the connection history of the connection order preceding the connection order of the connection device is “unconnected”.