In combination, a dump truck mountable particle screener for mounting atop the dump body of a dump truck, and a dump truck. 1 to 500 parts by mass of silicone powder having an average particle diameter of 0. The method includes associating each activity of the virtual space with a graphics icon representing the activity, the icon being for displaying via a graphics interface implemented by any activity sharing client application that is installed in each user terminal. The additive material can be applied as a coating formulation in an on-line manner to continuous paper web moving through an operating cigarette making machine. An adhesion force between the rare metal layer and insulating layer can be increased.