Abstract: When a digital copying machine is switched on, a main CPU confirms whether the current timing is a timing at which an advertisement can be displayed on a display section. If operational inputs are being performed from the display section in the digital copying machine, the advertisement cannot be displayed and thus a normal image forming operation is controlled. If operational inputs are not being performed from the display section and the current timing is the timing at which the advertisement can be displayed, it is conformed whether an HDD stores a registered image as an advertisement image. If there is at least one registered image in the HDD, the at least one registered image is displayed on the display section at predetermined time intervals at the timing of the advertisement display in accordance with the priority level. The registered image in the HDD, whose remaining designated display time has reduced to zero, is deleted.

Abstract: A heat generating agent for medical waste sterilization. The agent is at least one compound selected from calcium oxide, calcined dolomite, and magnesium oxide, and at least one compound selected from sulfamic acid, sodium bisulfate, and anhydrous phosphoric acid. The present invention also provides a method for sterilizing medical wastes. The method includes the steps of subjecting medical waste to exothermic reaction between water and a heat generating agent selected from calcium oxide and calcined dolomite or to exothermic reaction between iron powder and oxygen to generate reaction heat and/or alkalinity by the exothermic reaction. The present invention provides an aparatus to be used according to the method mentioned above.