Abstract: A vacuum ultraviolet ray-excited light-emitting phosphor comprising a compound represented by formula (BaxM1−x)1−0.25yMg1−yAl10+yO17+0.25y as a substrate, and Eu as an activator, wherein M represents Ca, Sr, or Ca and Sr, x and y satisfy the following relations, 0.5≦x ≦1 , and 0.05≦y≦0.15.

Abstract: A process for producing a vacuum ultraviolet ray-excited light-emitting phosphor comprising the steps of

Abstract: A method of producing an aluminate fluorescent substance, a fluorescent substance and a device containing a fluorescent substance. The method includes the steps of mixing an &agr;-alumina powder having an average primary particle size of from about 0.05 &mgr;m to less than 0.3 &mgr;m with a metal salt, and calcining the resulting mixture.

Abstract: A phosphor for a vacuum ultraviolet ray-exciting light-emitting element, comprising Eu as an activator, and aluminates having a magnetoplumbite structure.

Abstract: A phosphor for a vacuum ultraviolet excited light emitting device, obtained by adding Eu or Tb as an activating agent to a substrate comprising a compound represented by the general formula M1M2M3O4, wherein M1 represents at least one elements selected from Na and Li, M2 represents at least one elements selected from Gd and Y, and M3 represents at least one elements selected from Ge and Si.

Abstract: A self-propelling apparatus, suitable for use in automatic horizontal position welding of a large-sized square steel column such as architectural steel column, has a welder unit, travelling rollers and a seam tracking device. The travelling rollers are magnet-based rollers (1, 1') which are so arranged to hold the upper surface of the steel column and are mounted on a mounting plate (7). The mounting plate (7) is connected to the seam tracking device (6) through a rotational pivot (8) which is preloaded by a spring (9). The spacing between the travelling magnet rollers (1, 1') preferably ranges between 100 and 200 mm.

Abstract: A motorcycle having a swing-arm front suspension mechanism includes front and rear wheels, an engine disposed between the front and rear wheels and having an engine block, a front wheel steering knuckle disposed on one side of the front wheel and by which an axle of the front wheel is rotatably supported, an upper swing arm having a front end pivotally coupled to the knuckle and a rear end pivotally coupled to an upper portion of the engine block, the upper swing arm extending between the knuckle and the engine block, a lower swing arm having a front end pivotally coupled to the knuckle and at least one rear end pivotally coupled to a lower portion of the engine block, the lower swing arm extending between the knuckle and the engine block, and a damper having an upper end pivotally coupled to the engine block intermediate between two positions where the rear ends of the upper and lower swing arms are pivotally coupled to the engine block, and a lower end pivotally coupled to a base of the lower swing arm.

Abstract: A motorcycle frame in which both the front and rear wheels are supported by respective pairs of swing arms pivotally supported by two side frames. Each side frame has a front and a rear bracket and a connecting structure extending upwardly and longitudinally over the engine. The connecting structure may be integral with both of the brackets or may be a pipe frame bolted to the brackets.