A cooling arrangement adapted to be used in a process of preparing a fine powder, and a method for using same are described. The network terminal device includes a terminal controlling system that controls processing of functional units and outputs status information representing operational status of the network terminal device, and a sleeping system that lowers a power consumption of the terminal control system when a predetermined condition is satisfied. The processor may then display to the driver a first average number of safety events associated with a first safety event type along with a second average number of safety events associated with a second safety event type, wherein the first and second average numbers of safety events are based at least in part on the demographic information. The mask prevents deposition of the extrusion material along the peripheral edges of the wafer, and facilitates the formation of unbroken extrusion structures. Second metal wirings are provided on the plugs.