Abstract: To verify a qualification on a network without notifying verifier privacy information that can identify as a subject of a public key certificate while keeping safety of the public key infrastructure technology. An attribute certificate validation method wherein by preparing an environment in which only an attribute certificate validation device operated by a trusted third party can access a user's public key certificate, the verifier transmits attribute certificate and signed data received from a user having presented a qualification, to the attribute certificate validation device to thereby request the device to make a check to confirm authenticity of the holder of the attribute certificate, thereby preventing the public key certificate (particularly, privacy information contained in the public key certificate) of the user from being passed to the verifier.

Abstract: Without modifying application programs in a smart card, data and functions of the application programs can be used by one authentication operation if an apparatus has an invented authentication information management function utilization part. Even if the apparatus not implemented with the invention can use the smart card in a similar manner to the conventional manner. An authentication information management program for managing information necessary for authentication of each application is introduced into the smart card. When each application is utilized, the authentication information management program acquires the application authentication information after an authentication request message from the application program is captured, and transmits the application authentication information to the application program. It is possible to realize a method of utilizing data and functions possessed by the application programs through one authentication operation.

Abstract: An authentication system having a user apparatus that performs authentication using first authentication data and a second authentication server that performs authentication using second authentication data is provided. The user apparatus acquires the second authentication data from a user and requests authentication of the user by sending the acquired second authentication data to the second authentication server. The second authentication server performs authentication of the user on a basis of the second authentication data received from the user apparatus and sends the user apparatus a result of the authentication and when the authentication is successful, first authentication data stored being associated with the user. The user apparatus acquires a result of authentication based on the first authentication data received from the second authentication server and performs login processing when the acquired result of the authentication based on the first authentication data indicates success.

Abstract: Without modifying application programs in a smart card, data and functions of the application programs can be used by one authentication operation if an apparatus has an invented authentication information management function utilization part. Even if the apparatus not implemented with the invention can use the smart card in a similar manner to the conventional manner. An authentication information management program for managing information necessary for authentication of each application is introduced into the smart card. When each application is utilized, the authentication information management program acquires the application authentication information after an authentication request message from the application program is captured, and transmits the application authentication information to the application program. It is possible to realize a method of utilizing data and functions possessed by the application programs through one authentication operation.

Abstract: To verify a qualification on a network without notifying verifier privacy information that can identify as a subject of a public key certificate while keeping safety of the public key infrastructure technology. An attribute certificate validation method wherein by preparing an environment in which only an attribute certificate validation device operated by a trusted third party can access a user's public key certificate, the verifier transmits attribute certificate and signed data received from a user having presented a qualification, to the attribute certificate validation device to thereby request the device to make a check to confirm authenticity of the holder of the attribute certificate, thereby preventing the public key certificate (particularly, privacy information contained in the public key certificate) of the user from being passed to the verifier.

Abstract: The signer obtains the validity check information on the electronic certificate from the certification authority when it puts the digital signature on data and delivers the signed data, electronic certificate, and validity check information to the verifier. At this time, the certification authority creates validity check information on the electronic certificate in response to a validity check request from the signer and sends it to the signer. The term of validity of the validity check information is defined as necessary. The verifier verifies the signature and, using the validity check information sent from the signer, checks the validity of the electronic certificate.

Abstract: An electroluminescent phosphor includes a phosphor powder that has zinc sulfide as a phosphor host. The phosphor powder has an average particle size, which is expressed by a D(50) value, in the range of 10 &mgr;m or more and 20 &mgr;m or less. In addition, the phosphor powder has a particle size distribution, in which coarser particle component, of which particle size is 31 &mgr;m or more, is 15% by mass or less. An electroluminescent element includes a luminescent layer that includes such electroluminescent phosphor, and of which particle density is heightened on the basis of the average particle size and the particle size distribution of the phosphor powder. A transparent electrode layer is integrally disposed to face one main surface of the luminescent layer, and a rear electrode layer is integrally disposed through a reflective insulating layer on the other main surface. According to such electroluminescent element, brightness may be improved.

Abstract: An electroluminescent phosphor includes a phosphor powder that has zinc sulfide as a phosphor host. The phosphor powder has an average particle size, which is expressed by a D(50) value, in the range of 10 &mgr;m or more and 20 &mgr;m or less. In addition, the phosphor powder has a particle size distribution, in which coarser particle component, of which particle size is 31 &mgr;m or more, is 15% by mass or less. An electroluminescent element includes a luminescent layer that includes such electroluminescent phosphor, and of which particle density is heightened on the basis of the average particle size and the particle size distribution of the phosphor powder. A transparent electrode layer is integrally disposed to face one main surface of the luminescent layer, and a rear electrode layer is integrally disposed through a reflective insulating layer on the other main surface. According to such electroluminescent element, brightness may be improved.

Abstract: An electroluminescent phosphor comprises zinc sulfide as a phosphor base material, at least one kind selected from copper and manganese as an activator, and at least one kind selected from chlorine, bromine, iodine, and aluminum as a coactivator. The content of alkaline earth metal elements in the electroluminescent phosphor is 0.05% by weight or less. In addition, the electroluminescent phosphor includes cesium in the range of 0.0001% by weight or more and 0.01% by weight or less. Such an electroluminescent phosphor has excellent brightness and life. An electroluminescent element comprises a phosphor layer in which an electroluminescent phosphor is dispersed in a dielectric. The electroluminescent phosphor includes reduced amount of alkaline earth metal elements and a slight amount of cesium.

Abstract: A method for regenerating a fluorescent material from a recovered phosphor slurry characterized by including a chemical washing step wherein a hypochlorite and a periodate are used; a carbon removing step for floating carbon in the supernatant liquid by the use of ammonia thereby removing the carbon; an acid washing step; and a heat treating step in this order as well as a system for regenerating a fluorescent material comprising means for effecting the aforesaid steps. From this constitution, it becomes possible that impurities are easily and effectively removed from the recovered phosphor slurry, whereby a fluorescent material providing excellent luminance and excellent grade of phosphor film can be regenerated.

Abstract: Zinc silicate phosphor emitting green for cathode ray tubes with a long persistence, which does not contain arsenic.______________________________________ Formula aZnO.SiO.sub.2 :Mn.sub.x,In.sub.y ______________________________________ in which the conditions 1.5 .ltoreq. a .ltoreq. 2 5 .times. 10.sup.-5 .ltoreq. x .ltoreq. 3 .times. 10.sup.-2 1 .times. 10.sup.-5 .ltoreq. y .ltoreq. 1 .times. 10.sup.-2 ______________________________________are satisfied.

Abstract: A cathode-ray tube according to the present invention is provided with a phosphor screen comprising phosphors A, B, and C, wherein each of the phosphors A and B constitute 5 to 15% by weight and, the phosphor C constitutes 70 to 90% by weight. The phosphor A is a bluish white-emitting phosphor (Y.sub.1-x-y Gd.sub.x Tb.sub.y).sub.2 O.sub.2 S (0.ltoreq.X.ltoreq.0.999999 and 0.000001.ltoreq.Y.ltoreq.0.001), the phosphor B is at least one of a blue-emitting silver-activated hexagonal zinc sulfate (ZnS:Ag) phosphor, etc., and the phosphors C is a yellow-emitting phosphor (In.sub.1-p-r M.sub.p TB.sub.q Eu.sub.r BO.sub.3) (wherein M is at least one element selected from the group consisting of Sc, Lu, Y, Gd, and Ga, and p, q, and r satisfy 0.ltoreq.p.ltoreq.0.2, 0.0005.ltoreq.q.ltoreq.0.05, and 0.001.ltoreq.r.ltoreq.0.1). The cathode-ray tube of the present invention is a phosphor screen which is free from toxicity and has good flickering and brightness characteristics and high current dependence of brightness.

Abstract: In a cathode ray tube with a phosphor screen containing a Zn type green emitting phosphor, e.g. ZnS, ZnCdS and Zn.sub.2 SiO.sub.4, the surface of the phosphor particle includes a surface area of (Co,Zn)O. The surface area is green colored to operate as a filter against incident light from outside the tube and reduces background brightness of picture images caused by excitation of scattering electrons. Thus, the contrast of the picture images rises. The contrast is further increased by Ni doped.

Abstract: Disclosed is a method for surface treatment of phosphor particles which comprises forming a continuous film of silicon dioxide on the surface of each phosphor particle by treating the phosphor particle with a solution containing an aqueous solution of organic alkali and silicon dioxide dissolved therein.

Abstract: A zinc sulfide phosphor having no segregated free sulfides of copper and gold on the surface layer thereof, which contains 0.003 to 0.03% by weight of copper and 0.01 to 0.2% by weight of gold as co-activators and further 0.0025 to 0.04% by weight of aluminum each on the basis of the zinc sulfide. The chromaticity of the emission from the phosphor is in the range of x=0.310 to 0.350 and y=0.560 to 0.600 on CIE chromaticity coordinates.A method for the preparation of this zinc sulfide phosphor which comprises adding aluminum fluoride as the aluminum ion source and ammonium iodide as the flux compound to powdery raw material for phosphor composed of zinc sulfide and the activator compounds, and firing the formed mixture in a reducing sulfurous atmosphere, thereby removing any segregated free sulfides of copper and gold.