Abstract: A muffler in which in order to reduce a harsh high-frequency component exhaust noise as exhaust noise of a vehicle, and relieve a feeling of discomfort due to the exhaust noise, on at least one of an inner plate and an outer plate, a plurality of dot-shaped convex portions 15 and dot-shaped concave portions 16 are provided, and the convex portions 15 and concave portions 16 are alternately arranged to be surrounded with each other. Furthermore, the convex portion 15 is connected to the concave portion 16 by a curved surface.

Abstract: There is disclosed calcium silicates formed by reacting a silicic acid substance comprising an amorphous silicic acid gel obtained from clay minerals with a calcium compound. There also is disclosed a process for producing the same, and an inorganic antibacterial material using the same. The calcium silicates of the present invention have a high cationic exchange capacity and are excellent in the adsorbability of heavy metals. The inorganic antibacterial material according to the present invention can carry a sufficient amount of silver ions or silver complex ions and can be dispersed stably, for example, in a synthetic resin or the like. The production process according to the present invention can produce inorganic antibacterial material which are highly white and can be used suitably for various uses, and have sufficient antibacterial power.

Abstract: A POS terminal unit is provided which automatically notifies an operator about the presence of a customer waiting to make a purchase when a salesclerk is absent from the POS terminal unit. When an approach sensor 1 detects the approach of a customer to the POS terminal unit, a signal is transmitted to a control portion through a first detecting portion 3 and a buzzer is activated. An ID card identification sensor 2 is a non-contact type sensor capable of receiving data of an ID card 8 located within a predetermined space range, and sends the data of the ID card owned by the operator to a second detecting portion. After confirming whether or not the data received by the second detecting portion agrees with the pre-registered ID data registered in an ID information registration portion 9, the data is sent to the control portion 5.