Abstract: A surge protective device of the present invention includes an insulating tube 2, a pair of sealing electrodes 3 for closing openings on both ends of the insulating tube so as to seal a discharge control gas inside the tube, wherein the pair of sealing electrodes has a pair of convex electrode portions 5 projecting inwardly so as to face to each other, and at least one projecting part 2a projecting inwardly in a radial direction and extending in a circumferential direction is formed on the inner circumferential surface of the insulating tube.

Abstract: To provide a discharge tube having improved stability of operating voltage to repeated discharges. The discharge tube includes a cylindrical insulating hollow body having openings at least at both ends and at least a pair of sealing electrodes facing to each other for closing the openings so as to seal a discharge control gas inside the body, wherein a discharge trigger film made of a conductive material is formed on the inner circumferential surface of the insulating hollow body, each of the sealing electrodes has a convex portion projecting into the insulating hollow body and a discharge active layer(s) that is/are made of a material having higher electron emission characteristics than that of the sealing electrodes.

Abstract: A surge protective device of the present invention includes an insulating tube, a pair of sealing electrodes for closing openings on both ends of the insulating tube so as to seal a discharge control gas inside the tube, wherein the pair of sealing electrodes has a pair of convex electrode portions projecting inwardly so as to face to each other, and at least one groove part extending in a circumferential direction is formed on the inner circumferential surface of the insulating tube.

Abstract: To provide a surge protective device that can suppress the sublimation and disappearance of a discharge-assisting part and can improve the durability thereof. The surge protective device comprises an insulating tube, a pair of sealing electrodes for closing openings on the both ends of the insulating tube so as to seal a discharge control gas inside the tube, and a discharge-assisting part formed on the inner circumferential surface of the insulating tube, wherein the pair of sealing electrodes have a pair of convex electrode portions projecting inwardly and facing to each other, and the discharge-assisting part is composed of a laminate of an insulating layers made of an insulating material and ion-source layers made of an ion-source material that are formed on the top and bottom surfaces of the insulating layer.

Abstract: To provide a discharge tube having improved stability of operating voltage to repeated discharges. The discharge tube includes a cylindrical insulating hollow body having openings at least at both ends and at least a pair of sealing electrodes facing to each other for closing the openings so as to seal a discharge control gas inside the body, wherein a discharge trigger film made of a conductive material is formed on the inner circumferential surface of the insulating hollow body, each of the sealing electrodes has a convex portion projecting into the insulating hollow body and a discharge active layer(s) that is/are made of a material having higher electron emission characteristics than that of the sealing electrodes.

Abstract: A ZnO deposition material to be used for forming a transparent conductive film is composed of a ZnO pellet made of ZnO powder having a ZnO purity of 98% or more. The pellet includes one or more kinds of elements selected from the group consisting of Y, La, Sc, Ce, Pr, Nd, Pm and Sm. The ZnO pellet is polycrystal or monocrystal. The ZnO film formed by a vacuum film forming method employing the ZnO deposition material as a target material can exhibit excellent conductivity. The vacuum film forming method is preferably an electron beam vapor deposition method, an ion plating method or a sputtering method.

Abstract: A ZnO vapor deposition material for formation of a transparent conductive film or the like consists mainly of a porous ZnO sintered body containing one or more first additive elements selected from Ce, La, Y, Pr, Nd, Pm, and Sm, and second additive elements selected from Al, Ga, Sc, and B. The content of the first additive elements is higher than the content of the second additive elements. The content of the first additive elements is in a range of 0.1 to 14.9% by mass, and the content of the second additive elements is in a range of 0.1 to 10% by mass. The sintered body has a porosity of 3 to 50%.

Abstract: A ZnO vapor deposition material for formation of a transparent conductive film or the like consists mainly of a porous ZnO sintered body containing one or more first additive elements selected from Ce, La, Y, Pr, Nd, Pm, and Sm, and second additive elements selected from Al, Ga, Sc, and B. The content of the first additive elements is higher than the content of the second additive elements. The content of the first additive elements is in a range of 0.1 to 14.9% by mass, and the content of the second additive elements is in a range of 0.1 to 10% by mass. The sintered body has a porosity of 3 to 50%.

Abstract: A ZnO vapor deposition material for formation of a transparent conductive film or the like consists mainly of a porous ZnO sintered body containing one or more first additive elements selected from Ce, La, Y, Pr, Nd, Pm, and Sm, and second additive elements selected from Al, Ga, Sc, and B. The content of the first additive elements is higher than the content of the second additive elements. The content of the first additive elements is in a range of 0.1 to 14.9% by mass, and the content of the second additive elements is in a range of 0.1 to 10% by mass. The sintered body has a porosity of 3 to 50%.

Abstract: A ZnO vapor deposition material for formation of a transparent conductive film or the like consists mainly of a porous ZnO sintered body containing one or more first additive elements selected from Ce, La, Y, Pr, Nd, Pm, and Sm, and second additive elements selected from Al, Ga, Sc, and B. The content of the first additive elements is higher than the content of the second additive elements. The content of the first additive elements is in a range of 0.1 to 14.9% by mass, and the content of the second additive elements is in a range of 0.1 to 10% by mass. The sintered body has a porosity of 3 to 50%.

Abstract: A ZnO vapor deposition material for formation of a transparent conductive film or the like consists mainly of a porous ZnO sintered body containing one or more first additive elements selected from Ce, La, Y, Pr, Nd, Pm, and Sm, and second additive elements selected from Al, Ga, Sc, and B. The content of the first additive elements is higher than the content of the second additive elements. The content of the first additive elements is in a range of 0.1 to 14.9% by mass, and the content of the second additive elements is in a range of 0.1 to 10% by mass. The sintered body has a porosity of 3 to 50%.

Abstract: An alkaline battery comprises an electrode. The electrode has a current collector and an active substance filled in the current collector. The current collector includes a nonwoven fabric fabricated from a plurality of fibers and a nickel-plating film formed on the plurality of fibers. A specific surface area per unit volume of the current collector is 0.13 m2/cm3-0.35 m2/cm3.

Abstract: A ZnO deposition material to be used for forming a transparent conductive film is composed of a ZnO pellet made of ZnO powder having a ZnO purity of 98% or more. The pellet includes one or more kinds of elements selected from the group consisting of Y, La, Sc, Ce, Pr, Nd, Pm and Sm. The ZnO pellet is polycrystal or monocrystal. The ZnO film formed by a vacuum film forming method employing the ZnO deposition material as a target material can exhibit excellent conductivity. The vacuum film forming method is preferably an electron beam vapor deposition method, an ion plating method or a sputtering method.

Abstract: A MgO vapor deposition material, which is used to form a protective film of a plasma display panel, comprises pellets having MgO purity of 98% or more and relative density of 90% or more. The pellets contain one, or two or more kinds of elements selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, and Sm. The concentration of Y is from 5 to 10,000 ppm in the case of containing Y, the concentration of La is from 5 to 15,000 ppm in the case of containing La, the concentration of Ce, Pr, Nd, Pm, and Sm is from 5 to 16,000 ppm in the case of containing Ce, Pr, Nd, Pm and Sm respectively.

Abstract: A MgO vapor deposition material, which is used to form a protective film of a plasma display panel, comprises pellets having MgO purity of 98% or more and relative density of 90% or more. The pellets contain only a Sc element as a rare earth element. The concentration of the Sc element is from 5 to 5,000 ppm, preferably from 10 to 3,000 ppm, and more preferably from 20 to 2,000 ppm.

Abstract: An alkaline battery comprises an electrode. The electrode has a current collector and an active substance filled in the current collector. The current collector includes a nonwoven fabric fabricated from a plurality of fibers and a nickel-plating film formed on the plurality of fibers. A specific surface area per unit volume of the current collector is 0.13 m2/cm3-0.35 m2/cm3.

Abstract: A high strength spongy sintered metal composite sheet comprising a porous spongy sintered metal layer having continuous holes, and a high strength sintered, dense metal reinforcing layer having a porosity smaller than the porosity of the spongy sintered metal layer, laminated thereon, wherein the sintered, dense metal reinforcing layer has a thickness of 0.5-30% thickness with respect to the entire high strength spongy sintered metal composite sheet.

Abstract: A high strength spongy sintered metal composite sheet comprising a porous spongy sintered metal layer having continuous holes, and a high strength sintered, dense metal reinforcing layer having a porosity smaller than the porosity of the spongy sintered metal layer, laminated thereon, wherein the sintered, dense metal reinforcing layer has a thickness of 0.5-30% thickness with respect to the entire high strength spongy sintered metal composite sheet.

Abstract: The porous metallic material of the present invention has an overall porosity of 80 to 99%, and a skeleton in a three dimensional network structure which is entirely composed of a sintered metal powder having a porosity of 10 to 60%. The specific surface area is very high, for example, 300 to 11000 cm.sup.2 /cm.sup.3. The porous metallic material can be reinforced by a reinforcing plate. The porous metallic material is also suitable for an electrode of an alkaline secondary battery and enables achievement of increases in the life and the amount of the active material contained therein. The porous metallic material can be produced by preparing a foamable slurry containing a metal powder, forming the foamable slurry, drying the formed product, preferably after foaming, and finally burning the dry formed product.

Abstract: The porous metallic material of the present invention has an overall porosity of 80 to 99%, and a skeleton in a three dimensional network structure which is entirely composed of a sintered metal powder having a porosity of 10 to 60%. The specific surface area is very high, for example, 300 to 11000 cm.sup.2 /cm.sup.3. The porous metallic material can be reinforced by a reinforcing plate. The porous metallic material is also suitable for an electrode of an alkaline secondary battery and enables achievement of increases in the life and the amount of the active material contained therein. The porous metallic material can be produced by preparing a foamable slurry containing a metal powder, forming the foamable slurry, drying the formed product, preferably after foaming, and finally burning the dry formed product.