Abstract: A main server and a mirror server hold the same content. A server switching apparatus sets only one of the web servers to be active. In the case where the mirror server has not been attacked in an immediately-previous operating period, the server switching apparatus switches from the main server to the mirror server. Upon receiving a request from a client computer, the server switching apparatus transfers the request to the active web server. The active web server then sends the requested content.

Abstract: A main server and a mirror server hold the same content. A server switching apparatus sets only one of the web servers to be active. In the case where the mirror server has not been attacked in an immediately-previous operating period, the server switching apparatus switches from the main server to the mirror server. Upon receiving a request from a client computer, the server switching apparatus transfers the request to the active web server. The active web server then sends the requested content.

Abstract: A sliding member includes a base material portion formed of steel; a nitrogen diffusion layer with a thickness of 10 ?m to 50 ?m; and a nitrogen compound layer with a thickness of 10 ?m to 50 ?m. The nitrogen compound layer and the nitrogen diffusion layer are formed by performing a first heating process of performing heat treatment on a material formed of steel in an ammonia atmosphere at a temperature of 570° C. to 660° C., a second heating process of performing heat treatment on the material in a non-oxidizing and non-ammonia atmosphere at a temperature of 660° C. to 690° C., the temperature in the second heating process being higher than the temperature in the first heating process, and an oil cooling process of performing oil cooling treatment at an oil temperature of 60° C. to 80° C. subsequently to the second heating process.

Abstract: In a heat treating method and furnace used in this method which can prevent disturbance of an atmosphere gas inside a heat chamber, and can prevent deterioration of the processing quality and efficiency of work, a control section 4 first operates a vacuum pump VP to reduce the inner pressure of a purge chamber 3 to a predetermined pressure level, then manipulates a large and small caliber operating valve (13a, 13b) to supply the atmosphere from the interior of the heat chamber 1 to that of the purge chamber 3, and the control section 4 actuates transporting means 5 to transport the work W between the purge chamber 3 and the heat chamber 1 in a state wherein the inner pressures of the purge chamber 3 and the heat chamber 1 have been rendered substantially equal on the basis of detected values from first and second pressure sensors PS1, PS2.

Abstract: A steel for a large bearing suitable for parts of a large-sized bearing which are excellent in resistance to breakage and rolling fatigue life characteristics, and having a chemical composition by mass percentage of 0.80 to 1.30% of C, more than 0.35% and not more than 0.80% of Si, 0.30 to 0.90% of Mn, 0.90 to 1.50% of Cr, one or both of not more than 0.25% of Mo and 0.20 to 1.50% of Ni, the remainder being Fe and inevitable impurities, and exhibiting the following quench-hardenability measured according to a method specified in JIS G 0561: a HRC of 64 or more at J 1.5 mm, a HRC of 63 to 66 at J 7 mm, a HRC of 37 to 50 at J 15 mm, a HRC of 30 to 45 at J 20 mm, a HRC of 28 to 38 at J 45 mm.

Abstract: In a heat treating method and furnace used in this method which can prevent disturbance of an atmosphere gas inside a heat chamber, and can prevent deterioration of the processing quality and efficiency of work, a control section 4 first operates a vacuum pump VP to reduce the inner pressure of a purge chamber 3 to a predetermined pressure level, then manipulates a large and small caliber operating valve (13a, 13b) to supply the atmosphere from the interior of the heat chamber 1 to that of the purge chamber 3, and the control section 4 actuates transporting means 5 to transport the work W between the purge chamber 3 and the heat chamber 1 in a state wherein the inner pressures of the purge chamber 3 and the heat chamber 1 have been rendered substantially equal on the basis of detected values from first and second pressure sensors PS1, PS2.