Abstract: To prevent metal vapor and spatter from adhering to an optical system. A vacuum laser processing device includes: a laser beam irradiation unit having an optical system configured to emit a laser beam and an irradiation chamber through which the emitted laser beam passes; a construction chamber to which the irradiation chamber of the laser beam irradiation unit is connected, and in which an object to be processed to be constructed by the laser beam is positioned; a vacuum device unit configured to produce a vacuum in the interior of the construction chamber; and a gas supply unit having a gas nozzle configured to inject cross jet gas toward the laser beam at an irradiation port, which is the outlet of the laser beam of the irradiation chamber.

Abstract: A variable band-pass filter unit which is free from deterioration in throughput or incapability of communication even if jamming signals are inputted.

Abstract: A radio receiver apparatus for receiving a spread spectrum signal in which a signal derived through a level detection of a signal demodulated by a correlative demodulator and a signal obtained by extracting a signal component of a synchronous frequency from a reception synchronizing clock are combined to thereby generate a reference signal having a level which changes in accordance with change of the detected signal, and by comparing the detected signal with the reference signal, the received signal is discriminated.

Abstract: A radio receiver apparatus for receiving a spread spectrum signal in which a signal derived through a level detection of a signal demodulated by a correlative demodulator and a signal obtained by extracting a signal component of a synchronous frequency from a reception synchronizing clock are combined to thereby generate a reference signal having a level which changes in accordance with change of the detected signal, and by comparing the detected signal with the reference signal, the received signal is discriminated.

Abstract: Disclosed herein is a catalyst for especially for selective hydrogenation among a carbon-carbon double bond, a carbonyl group and an aromatic unsaturated ring such as benzene. The catalyst comprising platinum and zeolite can be employed for selectively hydrogenating the carbon-carbon double bond and the carbonyl group of an organic compound without the hydrogenation of the aromatic unsaturated. The catalyst comprising the platinum supported on a support which comprises powders of an inorganic component to which is supported polyethylene glycol or an ethylvinylbenzene-divinylbenzene copolymer can be employed for selectively hydrogenating the carbon-carbon double bond of an organic compound without the hydrogenation of the carbonyl group and the aromatic unsaturated ring.

Abstract: Pyrano[f]quinoline derivatives of the formula (I): ##STR1## wherein R.sub.1 and R.sub.2 represent hydrogen, hydroxyl group or a group of the formula: ##STR2## wherein n represents an integer from 1 to 4, R.sub.3 and R.sub.4 represent hydrogen or a lower alkyl group, and the broken lines in the rings represent that the bond between the carbon atoms at the 1- and 2-positions and the bond between the carbon atoms at the 9- and 10-positions may be double bonds, and pharmaceutical compositions containing the derivatives. The derivatives and compositions are useful as anti-thrombotic agents, cerebral circulation improving agents, hypotensive agents, anti-angina agents, anti-asthmatic agents, anti-ulcer agents and anti-PAF agents.