Abstract: A suction injection pipe and a subcooling heat exchanger are provided at a main refrigerant circuit in which a main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A controller performs control for switching between a cooling action of the subcooling heat-exchanger that cools the main refrigerant that is sent to a main use-side heat exchanger by using the suction injection pipe and the subcooling heat exchanger, and a cooling action of the sub-refrigerant-circuit that cools the main refrigerant that is sent to the main use-side heat exchanger by using the sub-refrigerant circuit.

Abstract: A laser processing device includes a nozzle attached to a laser processing head and including an emission hole through which a laser beam is emitted, an optical element configured to directly face the emission hole when the laser processing head is at a predetermined position, a nozzle inspection device including an image pickup device for picking up, through the optical element, an image of the emission hole viewed from a direction of an optical axis of the laser beam, a gas blowing unit for blowing a gas toward the optical element, and an operation control unit configured to cause the gas to be blown from the gas blowing unit toward the optical element before the image pickup device picks up the image after the laser processing head is moved to the predetermined position.

Abstract: A reflected beam detection value obtained by detecting a reflected beam of a visible beam generated on a sheet metal or a scattered beam detection value obtained by detecting a scattered beam from an optical component is stored in a storage unit, the reflected beam or the scattered beam being detected at a time when the sheet metal is cut by irradiating the sheet metal with a laser beam under a predetermined processing condition. The reflected beam detection value or the scattered beam detection value stored in the storage unit is registered as a reference value associated with the predetermined processing condition.

Abstract: A display driving device performs display drive based on display data with respect to a display unit including pixels arranged at respective intersections of data lines and scanning lines. The device includes: a current setting unit configured to store current gradation values which are set for the respective scanning lines that constitute a frame of the display data; a current gradation control unit configured to, at each of scan timings for the respective scanning lines within one frame, generate a constant current corresponding to a current gradation value for a corresponding scanning line among the current gradation values stored in the current setting unit; and a data line driving unit configured to supply the constant current generated by the current gradation control unit to the respective data lines for time periods corresponding to pixel gradation values defined by the display data.

Abstract: A display driving device performs display drive based on display data with respect to a display unit including pixels arranged at respective intersections of data lines and scanning lines. The device includes: a current setting unit configured to store current gradation values which are set for the respective scanning lines that constitute a frame of the display data; a current gradation control unit configured to, at each of scan timings for the respective scanning lines within one frame, generate a constant current corresponding to a current gradation value for a corresponding scanning line among the current gradation values stored in the current setting unit; and a data line driving unit configured to supply the constant current generated by the current gradation control unit to the respective data lines for time periods corresponding to pixel gradation values defined by the display data.

Abstract: A process for producing a low water-absorbing artificial lightweight aggregate, which comprises:granulating a starting powdery material containing coal ash, having such a particle size distribution that a residue on a 297 .mu.m standard wire sieve is not more than 1 wt. %, and 1 to 20 parts by weight of a hydraulic material per 100 parts by weight of said coal ash in the presence of water;curing the resulting granules for a period of not shorter than 20 hours; orheat-treating the resulting granules at a temperature of not higher than 700.degree. C. for a period of not shorter than 30 minutes; and,calcining the granules at a temperature of 1,000.degree. to 1,500.degree. C.

Abstract: A signal transmission system for transmitting, in particular, an ignition timing correction signal in an ignition timing control system for an internal combustion engine includes an ignitor for producing an ignition timing signal in response to an ignition signal from a distributor, and the ignition timing signal is further corrected by the ignition timing correction signal calculated in a computer based on engine operating conditions sensed by sensors. The computer includes a voltage-current converting circuit which converts the ignition timing correction signal in the form of a voltage signal into a current signal corresponding thereto and supplies the current signal to the ignitor through a signal line connecting between the computer and the ignitor. The ignitor includes a current-voltage converting circuit to convert the current signal from the computer into a voltage signal corresponding to the current signal which indicates the correction of the ignition timing.

Abstract: A process for producing an artificial light-weight aggregate comprising SiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and at least one oxide selected from the group consisting of MgO and CaO which has an absolute dry specific gravity of not higher than 1.5, a crushing strength of not less than 55 kfg/cm.sup.2 and a 24 hour water-absorption ratio of not greater than 2.4%. The process comprises granulating a raw powder material comprising SiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3 and at least one oxide selected from the group consisting of MgO and CaO, in which the total amount of SiO.sub.2 and Al.sub.2 O.sub.3 is from 75 to 92 wt. %, the weight ratio of Al.sub.2 O.sub.3 /SiO.sub.2 is from 0.25 to 0.70, and the total amount of Fe.sub.2 O.sub.3 and MgO and/or CaO is from 6-20 wt. % and containing at least 80% by weight of a coal ash having a Blaine specific surface area of 2,000 to 9,000 cm.sup.2 /g to give granules having an average apparent specific gravity of 1.1 to 1.8 and a crushing strength of 0.