Abstract: A cast aluminum alloy vehicle wheel has a central disk, a rim, and a rim carrying portion located between the rim and the central disk. The rim has an end or tip portion that is the farthest portion of the rim from the disk, and a barrel portion is located between the rim carrying portion and the rim end. The microstructure of the metal provides a dendritic arm spacing (DAS) that is smaller at the rim end than at the rim barrel. Additionally, the DAS of the barrel portion is less then at the central disk. The DAS of the rim carrying portion is equal or less then the DAS of the barrel portion on the rim. A high strength wheel is provided, especially at the rim.

Abstract: A casting mold has a main body provided with a vent hole opened up in a casting space of said main body. The improvement is characterized in that the vent hole is provided with air discharging means and air feeding means which are disposed at the vent hole and the air discharging means and air feeding means are suitably selected so that air within the casting space can be discharged and a pressurized air can be fed toward the casting space through the vent hole.

Abstract: In a system for disposing radioactive gaseous wastes in a nuclear power plant including a steam turbine and a main condenser connected thereto, a recombining unit is connected to the main condenser and includes a preheater for heating the radioactive gaseous wastes fed from the main condenser to a predetermined temperature and a recombiner for recombining into water vapor oxygen and hydrogen contained in the radioactive gaseous wastes passing through the preheater. A condenser is connected to the recombining unit for cooling the recombined water vapor contained in the radioactive gaseous wastes into condensed water and a hold-up device connected to the condenser for adsorbing and holding up the radioactive gaseous wastes with an adsorbing agent. The waste gas is discharged from a stack connected to the holdup device into atmosphere.