Abstract: In image combining method of phototaking an object to be photographed by using a plurality of image taking systems with portions of fields of view thereof overlapping, and forming combined image information by combining pieces of image information obtained by the image taking systems, coordinates changing processing is performed by using the distance information of an object to be photographed, and image signals output from the respective image taking systems are compensated in accordance with the changed coordinates. One of the compensated image signals is selected with respect to a region where a far-distance portion of the object is concealed by a near-distance object, of the overlapping region of a combined image signal.

Abstract: In order to reproduce a stereoscopic image even when the base length or convergence angle between two cameras upon phototaking is difference from that between the naked eyes of an observer upon reproducing, means for extracting parallax information between images obtained by a plurality of cameras, means for symbolizing and recording discriminating information between a double area and single eye areas, intensity information of pixels, and parallax information on the double area in images obtained by the extracting means on a recording medium, and means for storing optical configuration information of the cameras are arranged, and images are reproduced on the basis of the recorded information, the optical disposal information, and optical configuration information upon reproducing.

Abstract: A heavy-duty gas turbine includes a compressor; a combustion liner; a turbine blade in a single stage or multi-stages; and a turbine nozzle provided in correspondence to the turbine blade. The turbine blade has a dovetail secured to a turbine disk and has an overall length of not less than 180 mm, and it is made of a single-crystal Ni-base alloy whose .gamma. phase is a single crystal. Operating gas temperature is not less than 1400.degree. C., and metal temperature of a first blade is not less than 1000.degree. C. under working stress.

Abstract: The present invention realizes to increase a recording density in an optical information recording medium. The recording medium on which multi-value digital information is recorded includes a mark for forming an identification signal for identifying values of the multi-value digital signal from a reproduction signal obtained upon reproduction of the information recorded in the recording medium. An optically information recording/reproducing method according to the present invention has an information recording step and an information reproducing step. In the information recording step, a reference mark and multi-value digital information are recorded on the recording medium. The reference mark is to form an identification signal used for identifying values of the multi-value digital information from a reproduction signal optically detected from the recording medium.

Abstract: A gas-turbine moving blade made of a Ni-base superalloy containing less grain boundary strengthening elements, in which a blade portion is formed of a single crystal and the rest is formed of columnar crystals, and a gas turbine including the moving blade. A thermal efficiency of the gas turbine can be improved to 35% or more, and a thermal efficiency of complex power generation with a steam turbine can be improved to 45% or more.

Abstract: A heavy-duty gas turbine includes a compressor; a combustion liner; a turbine blade in a single stage or multi-stages; and a turbine nozzle provided in correspondence to the turbine blade. The turbine blade has a dovetail secured to a turbine disk and has an overall length of not less than 180 mm, and it is made of a single-crystal Ni-base alloy whose .gamma. phase is a single crystal. Operating gas temperature is not less than 1400.degree. C., and metal temperature of a first blade is not less than 1000.degree. C. under working stress.

Abstract: A heat resistant steel of the present invention contains 0.05 to 0.2 wt. % of C, less than 0.5 wt. % of Si, less than 0.6 wt. % of Mn, 8 to 13 wt. % of Cr, 1.5 to 3 wt. % of Mo, 2 to 3 wt. % of Ni, 0.05 to 0.3 wt. % of V, 0.02 to 0.2 wt. % in total of either or both of Nb and Ta, 0.02 to 0.1 wt. % of N and the balance substantially Fe. Since a gas turbine of the present invention is constituted by members, such as discs, blades, shafts and so forth, made of alloys of this kind, the gas turbine has a structure in which it is possible to achieve a high level of creep rupture strength and Charpy impact value.

Abstract: A method of recording information on a recording medium includes generating a plurality of blocks, each having a certain, in the recording area of the recording medium and recording data and directories for effecting the control of the data in the same block in each of the blocks.

Abstract: There is disclosed an information record method comprising the steps of recording information in one record area of an information record medium having a plurality of record areas, reproducing the recorded information and checking error thereof, and recording an indicia indicating absence of error at a portion of the record area in accordance with an error check result. An information record apparatus used for the above method comprises a device for recording information on an information record medium having a plurality of record areas, a device for moving the record device to a record area to which information is to be recorded, a device for reproducing the information recorded in the record area, a device for checking error based on the reproduced information, and a device for recording an indicia for indicating absence of error at a portion of the record area in accordance with error check result.

Abstract: A heat resistant steel of the present invention contains 0.05 to 0.2 wt. % of C, less than 0.5 wt. % of Si, less than 0.6 wt. % of Mn, 8 to 13 wt. % of Cr, 1.5 to 3 wt. % of Mo, 2 to 3 wt. % of Ni, 0.05 to 0.3 wt. % of V, 0.02 to 0.2 wt. % in total of either or both of Nb and Ta, 0.02 to 0.1 wt. % of N and the balance substantially Fe. Since a gas turbine of the present invention is constituted by members, such as discs, blades, shafts and so forth, made of alloys of this kind, the gas turbine has a structure in which it is possible to achieve a high level of creep rupture strength and Charpy impact value.

Abstract: A high-strength austenitic steel having a fully austenite structure and consisting essentially of 0.02 to 0.15 wt % of C, not greater than 1.5 wt % of Si, not greater than 2.5 wt % of Mn, 8 to 20 wt % of Ni, 13 to 25 wt % of Cr, 0.02 to 0.25 wt % of Al, not greater than 0.1 wt % of N, at least one of 0.001 to 0.01 wt % of B, 0.02 to 0.5 wt % of Nb, 0.01 to 0.2 wt % of Ti and 0.02 to 0.6 wt % of V and the balance substantialy Fe, with the weight ratio (Al/N) ranging between 1 and 4.5. This steel is suitable for use as the material of, for example, inner casing of steam turbine, valve body incorporated in the steam turbine, rotor shaft, and chemical equipment such as reaction pipe and vessel for styrene monomer producing facility.

Abstract: A steam turbine rotor shaft made of precipitation-hardened forged austenite steel, comprising first, second and succeeding layers of build-up welding provided on an outer surface of a bearing portion of a journal section in the rotor shaft, the first layer being provided by use of a welding rod of Ni base alloy, the second and succeeding layers being provided by use of a welding rod of low alloy steel which layers have better bearing characteristics than those of the austenite steel.

Abstract: A heat-resistant and corrosion-resistant weld metal alloy consisting essentially of, by weight, less than 0.08% of C, 0.1 to 1.0% of Si, 2 to 3% of Mn, 32 to 42% of Ni, 21 to 25% of Cr, 0.8 to 1.7% of Mo, 0.1 to 1.0% of Nb, up to 0.5% of Ti, up to 2% of Co, up to 2% of Cu, up to 1% of W, up to 0.2% of N, up to 1.0% of V, up to 1.0% of Zr, up to 1.0% of Ta and the balance Fe, wherein the following conditions are met: Ti+Zr.ltoreq.1.0%, Ni+Co.ltoreq.42%, W+V.ltoreq.1.0%, Nb+Ta.ltoreq.1.0%, and 4.ltoreq.Nb/C.ltoreq.15; and an austenitic welded structure composed of an austenitic structural alloy and of a weld metal of the above-mentioned kind are provided by the invention.