Abstract: Cement comprising hydraulic cement and polymer precursor such as alcohol-soluble phenol resin precursor that is substantially anhydrous and generates water by polymerization.

Abstract: Cement comprising hydraulic cement and polymer precursor such as alcohol-soluble phenol resin precursor that is substantially anhydrous and generates water by polymerization.

Abstract: A moldable polyimide resin composition which has melt-flowability and excellent processability in addition to essential heat-resistant of polyimide and comprises an aromatic bisimide compound and polyimide resin. A further aspect relates to a carbon fiber reinforced polyimide resin composition which has excellent mechanical strengths and comprises a carbon fiber coated with aromatic bisimide compound on the surface and the polyimide resin. A still further aspect relates to a novel bisimide compound which is very useful as the aromatic bisimide compound in the composition.

Abstract: A magnetooptical recording medium provided with a first magnetic layer and a second magnetic layer having a higher Curie point and a lower coercive force than the first magnetic layer and being exchange coupled with the first magnetic layer satisfies the relation: ##EQU1## wherein H.sub.H is the coercive force of the first magnetic layer; H.sub.L is the coercive force of the second magnetic layer; M.sub.s is the saturation magnetization of the second magnetic layer; h is the thickness thereof; and .sigma..sub.w is the magnetic wall energy between the first and second magnetic layers.

Abstract: A magnetooptical recording medium is provided with a transparent substrate, a first magnetic layer, a second magnetic layer having a higher Curie point and a lower coercive force than those of the first magnetic layer and being exchange coupled with the first magnetic layer. The medium further includes a third magnetic layer located between the first and second magnetic layers, so that the first magnetic layer is closer to the transparent substrate than the second and third magnetic layers and the third magnetic layer is closer to the transparent substrate than the second magnetic layer. Also disclosed is a process for recording on such a medium.

Abstract: An optical recording medium comprises a transparent substrate, an inner protection layer, a recording material layer, an outer protection layer, and a reflection layer, which are laminated in this order. In an in-groove recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.52 and 0.95. In an on-land recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.32 and 0.6.

Abstract: A moldable polyimide resin composition which has melt-flowability and excellent processability in addition to essential heat-resistant of polyimide and comprises an aromatic bisimide compound and polyimide resin. A further aspect relates to a carbon fiber reinforced polyimide resin composition which has excellent mechanical strengths and comprises a carbon fiber coated with aromatic bisimide compound on the surface and the polyimide resin. A still further aspect relates to a novel bisimide compound which is very useful as the aromatic bisimide compound in the composition.

Abstract: A gas turbine combustor comprises a cylindrical outer casing having one end closed by a header plate. A combustor liner provided with an inner combustion chamber which is divided into a first-stage combustion region on a side of the header plate and a second-stage combustion region formed on a downstream side of the first-stage combustion region. A first-stage fuel supply unit mounted to the header plate for injecting a first-stage fuel to the first-stage combustion region and a second-stage fuel supply unit mounted to the header plate for injecting a second-stage fuel previously mixed in a lean fuel state. The first-stage fuel supply unit includes a first-stage fuel nozzle assembly, which supplies the first-stage fuel, formed by combining a diffusion combustion nozzle and a pre-mixture combustion nozzle.

Abstract: An optical recording medium comprises a transparent substrate, an inner protection layer, a recording material layer, an outer protection layer, and a reflection layer, which are laminated in this order. In an in-groove recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.52 and 0.95. In an on-land recording mode, the ratio of the thickness of the recording material layer to the thickness of the outer protection layer is in a range between 0.32 and 0.6.

Abstract: A combustor for a gas turbine utilizing a catalytic combustion system comprises a cylindrical outer casing, a combustion cylinder concentrically disposed inside the outer casing with an annular space between an outer periphery of the combustion cylinder and an inner periphery of the outer casing as a combustion air supply passage, the combustion cylinder having one end facing the closed one end of the casing with a space therebetween, and a catalyst unit disposed inside the combustion cylinder, the air for combustion being supplied to the catalyst unit. A heat exchanging device is formed in the air supply passage for heating the combustion air passing the air supply passage to a temperature more than a catalytic combustion starting temperature through a heat exchanging operation by a thermal energy of a combustion gas in the combustion cylinder.

Abstract: A magneto-optical recording method employs a magneto-optical recording medium having a first magnetic layer which exhibits a low coercive force at room temperature and a high Curie temperature and a second magnetic layer which is exchange-coupled to the first magnetic layer and which exhibits a higher coercive force and a lower Curie temperature as compared with those of the first magnetic layer. A magnetic field modulated in accordance with information to be recorded is applied to the magneto-optical recording medium while irradiating it with a light beam of a constant intensity so as to record the information. The recorded information is simultaneously confirmed by using a reflected light of this light beam.

Abstract: A laser beam is radiated on a recording medium such as a phase transition type optical disk to change optical characteristics depending on a change in arrangement of atoms in a recording layer of the recording medium so as to repetitively record/erase information represented by the lengths of optical marks, the recording power of the laser beam radiated to record the information in the recording medium is changed stepwise in two or more power levels sequentially higher than an erasure power level of a laser beam radiated to erase the information recorded in the recording medium.

Abstract: A switching power source applicable to an electronic apparatus and capable of stabilizing an output voltage with a high transform efficiency even when an input voltage varies over a broad range. The output voltage is controlled at the primary circuit side of the power source. The base current is maintained constant with no regard to the input voltage.

Abstract: A brake actuating apparatus which includes a motor disposed at a brake caliper, a driving piston connecting through a converting member which converts a rotary motion of the motor into a linear motion, and a fluid chamber disposed between the driving piston and a pad urging piston for urging the brake pad in the brake caliper, and a diameter of the driving piston is arranged smaller than that of the pad urging piston.

Abstract: In a watt-hour meter in which first and second input signals representing an analog electric current and an analog voltage of an alternating current are converted into first and second digital signals, a first adder produces a sum signal which represents a sum of the first input signal and an additional analog signal of a frequency different from that of the first input signal and which is substituted for the first input signal. The meter may further comprise a second adder which adds another additional analog signal to the second input signal. Alternatively, the meter comprises low-pass filters and oversample-and-convert circuits to produce the first and the second input digital signals.

Abstract: A brake control system for a vehicle in which a brake pressure is generated in accordance with a signal from an electronic control unit for applying the brake pressure to vehicle wheels, characterized in that a mechanical brake system is automatically actuated when an unexpected electrical fault has occurred in an electrical brake system.

Abstract: A process for the production of a printed wiring board, which comprises preparing a copper-clad laminate having a through-hole formed by drilling; providing a first resist pattern on the surface of the copper-clad laminate so as to cover a portion to be formed as a conductor pattern; etching the copper-clad laminate; removing the first resist pattern; subjecting the whole laminate to an electroless copper plating; laminating a dry film resist on the copper-clad laminate; exposing and developing the dry film resist to form a second resist pattern in such a manner that the through-hole and a portion to be plated are exposed; subjecting the exposed portions to an electrolytic copper plating; removing the second resist pattern; and removing the exposed electroless copper plating through etching.

Abstract: A process for stabilizing dibenzylidenesorbitols comprising incorporating 0.05-20 pts. wt. sorbic acid and/or potassium sorbate in 100 pts. wt. dibenzylidenesorbitol represented by the following formula, ##STR1## and a stabilized dibenzylidenesorbitol composition formed thereby. The storage stability of dibenzylidenesorbitols is thus greatly improved.

Abstract: There is disclosed an opto-magnetic recording medium which comprises a substrate, a first magnetic layer of a Gd-Fe-Co amorphous alloy formed on the substrate and having iron group sublattice magnetization superiority, saturated magnetization of which falls within the range of 25 to 125 emu/cm.sup.3, and a second magnetic layer of an R-Fe-Co (wherein R is at least one element selected from the group consisting of Tb and Dy) amorphous alloy having a higher coercive force than that of the first magnetic layer, a lower Curie point than that, and rare earth group sublattice magnetization superiority, saturated magnetization of which falls within the range of 25 to 175 emu/cm.sup.3, and in which second magnetic layer is exchange-coupled with the first magnetic layer.

Abstract: An information recording method, which performs recording of an information by use of an optical magnetic recording medium provided with a first magnetic layer and a second magnetic layer having higher Curie point and lower coercive force at room temperature than the first magnetic layer, by carrying out initialization to align the magnetization direction of the second magnetic layer in one direction and then irradiating an optical beam of which power has received modulation between the two values which are not zero depending on the information, thereby recording the information as the arrangement of a magnetic domain on the above medium, has characteristic such that, when initialized again after recording of the above information, an interface magnetic wall is permitted to exist between said first and second magnetic layers at the portion other than said magnetic domain.