Abstract: A service lifespan prediction device includes: an operation history accumulation unit; a service lifespan prediction unit; a usage range frequency calculation unit; a usage range frequency storage unit; and a deviation calculation unit. In a case where a deviation between the latest value of a usage range frequency calculated by the deviation calculation unit and a previous value of the usage range frequency is equal to or greater than a threshold value, the service lifespan prediction unit calculates a stress increase rate based only on an accumulated operation history after the latest value of the usage range frequency is calculated.

Abstract: Provided is a diagnosis device for an internal combustion engine where the internal combustion engine includes a blow-by gas passage through which blow-by gas flows and the diagnosis device includes a temperature sensor which detects a temperature inside the blow-by gas passage and an abnormality detection unit which detects an abnormality in the internal combustion engine based on a detected value of the temperature sensor.

Abstract: A gallium nitride crystal substrate has a diameter of 50-155 mm and a thickness of 300-800 ?m and includes any of a flat portion and a notch portion in a part of an outer edge. The gallium nitride crystal substrate contains any of oxygen atoms, silicon atoms, and carriers at a concentration of 2×1017 to 4×1018 cm?3, and has an average dislocation density of 1000 to 5×107 cm?2 in any of a first flat region extending over a width from the flat portion to a position at a distance of 2 mm in a direction perpendicular to a straight line indicating the flat portion in a main surface and a first notch region extending over a width from the notch portion to a position at a distance of 2 mm in a direction perpendicular to a curve indicating the notch portion in the main surface.

Abstract: This blow-by gas discharging device is provided with: a blow-by gas pipe 23 that extends from the upper end height position to the lower end height position of an internal combustion engine 1 and that has an outlet 33 exposed to outside air and opened to the atmosphere; a heating chamber 24 that is provided to the midway of the blow-by gas pipe, and formed in a flywheel housing 10 of the internal combustion engine so as to heat a blow-by gas; and a drain mechanism that is provided to the heating chamber so as to discharge oil accumulated in the heating chamber.

Abstract: This oil return structure is provided with a flow passage body configured to return oil into an engine body which communicates with an oil storage section of the engine, the oil having been separated from a blow-by gas by an oil separation means. The upstream end of the flow passage body is connected to the oil separation means, at least a portion of the downstream side of the flow passage body protrudes into the engine body from the inner wall thereof, and an oil discharge opening at tire downstream end of the flow passage body is disposed at a position not immersed in oil within the oil storage section.

Abstract: Provided is a diagnosis device for an internal combustion engine where the internal combustion engine includes a blow-by gas passage through which blow-by gas flows and the diagnosis device includes a temperature sensor which detects a temperature inside the blow-by gas passage and an abnormality detection unit which detects an abnormality in the internal combustion engine based on a detected value of the temperature sensor.

Abstract: This blow-by gas discharging device is provided with: a blow-by gas pipe 23 that extends from the upper end height position to the lower end height position of an internal combustion engine 1 and that has an outlet 33 exposed to outside air and opened to the atmosphere; a heating chamber 24 that is provided to the midway of the blow-by gas pipe, and formed in a flywheel housing 10 of the internal combustion engine so as to heat a blow-by gas; and a drain mechanism that is provided to the heating chamber so as to discharge oil accumulated in the heating chamber.

Abstract: This blow-by gas system is provided with: a blow-by gas flow path through which a blow-by gas discharged from an internal combustion engine passes; and an oil separator disposed midway along the blow-by gas flow path. A downstream end of the blow-by gas flow path connects to at least one of a predetermined portion of an intake passageway and a midway portion of an air introduction passageway. The predetermined portion is a portion at which at least some of the blow-by gas that has flowed into the intake passageway flows into the air introduction passageway together with an intake air in the intake passageway.

Abstract: This blow-by gas system is provided with: a blow-by gas flow path through which a blow-by gas discharged from an internal combustion engine passes; and an oil separator disposed midway along the blow-by gas flow path. A downstream end of the blow-by gas flow path connects to at least one of a predetermined portion of an intake passageway and a midway portion of an air introduction passageway. The predetermined portion is a portion at which at least some of the blow-by gas that has flowed into the intake passageway flows into the air introduction passageway together with an intake air in the intake passageway.

Abstract: A blow-by gas recirculation device includes: a blow-by gas passage connected to an intake passage; an oil separator provided in the blow-by gas passage; and an adsorption/desorption member which is provided in the intake passage and/or the blow-by gas passage. The intake passage and the blow-by gas passage is located between the oil separator and the compressor of a turbocharger, and the adsorption/desorption member is configured so as to adsorb oil contained in a blow-by gas B and desorb the oil while the diameter of particles of the oil is increased.

Abstract: This blow-by gas system is provided with: a blow-by gas flow path through which a blow-by gas discharged from an internal combustion engine passes; and an oil separator disposed midway along the blow-by gas flow path. A downstream end of the blow-by gas flow path connects to at least one of a predetermined portion of an intake passageway and a midway portion of an air introduction passageway. The predetermined portion is a portion at which at least some of the blow-by gas that has flowed into the intake passageway flows into the air introduction passageway together with an intake air in the intake passageway.

Abstract: A blowby-gas reflux system 60 has: a blowby-gas reflux path 70; an atmospheric release mechanism 90 that releases, into the atmosphere, blowby gas Gb that has passed through an oil separator 80; and a control device 50. The control device 50 is provided with: a determination unit 51 that determines whether oil caulking occurs in a compressor 41 on the basis of the operating state of the compressor; and a control unit 51 that stops the release of the blowby gas into the atmosphere performed by the atmospheric release mechanism if the determination unit determines that oil caulking does not occur, and that causes the atmospheric release mechanism to release the blowby gas into the atmosphere if the determination unit determines that oil caulking occurs.

Abstract: This oil return structure is provided with a flow passage body configured to return oil into an engine body which communicates with an oil storage section of the engine, the oil having been separated from a blow-by gas by an oil separation means. The upstream end of the flow passage body is connected to the oil separation means, at least a portion of the downstream side of the flow passage body protrudes into the engine body from the inner wall thereof, and an oil discharge opening at tire downstream end of the flow passage body is disposed at a position not immersed in oil within the oil storage section.

Abstract: A control device (40) is connected to a differential pressure sensor (41), a navigation system (42), and a fuel injection valve (17). The control device (40) is configured to: execute a regeneration control of monitoring a purification situation (C1) and supplying unburned fuel (F2), which is injected from the fuel injection valve (17) and does not contribute to driving, to an exhaust gas purification system (20) in a case where the purification situation (C1) becomes a deteriorated situation (Ca); and execute a control of monitoring a road situation (C2) and stopping the regeneration control before the road situation (C2) actually becomes an accelerator off situation (Cb) in which an accelerator opening degree (?1) of an accelerator pedal (43) becomes off.

Abstract: A gallium nitride crystal substrate has a diameter of 50-155 mm and a thickness of 300-800 ?m and includes any of a flat portion and a notch portion in a part of an outer edge. The gallium nitride crystal substrate contains any of oxygen atoms, silicon atoms, and carriers at a concentration of 2×1017 to 4×1018 cm?3, and has an average dislocation density of 1000 to 5×107 cm?2 in any of a first flat region extending over a width from the flat portion to a position at a distance of 2 mm in a direction perpendicular to a straight line indicating the flat portion in a main surface and a first notch region extending over a width from the notch portion to a position at a distance of 2 mm in a direction perpendicular to a curve indicating the notch portion in the main surface.

Abstract: A blow-by gas reduction device includes: a gas return pipe, one end of which is connected to an engine and the other end of which is connected to an intake pipe, to return a blow-by gas in the engine to an intake side; an oil separator that is connected to the gas return pipe; an oil return pipe that is connected to the oil separator and is disposed with an inclination so as to return the oil to an inside of the engine; and a check valve that is provided in the oil return pipe, wherein the oil return pipe between the oil separator and the check valve is formed such that that the oil return pipe located at the check valve side is located at a lower side everywhere as compared with the oil return pipe located at the oil separator side.

Abstract: A control device (40) is connected to a differential pressure sensor (41), a navigation system (42), and a fuel injection valve (17). The control device (40) is configured to: execute a regeneration control of monitoring a purification situation (C1) and supplying unburned fuel (F2), which is injected from the fuel injection valve (17) and does not contribute to driving, to an exhaust gas purification system (20) in a case where the purification situation (C1) becomes a deteriorated situation (Ca); and execute a control of monitoring a road situation (C2) and stopping the regeneration control before the road situation (C2) actually becomes an accelerator off situation (Cb) in which an accelerator opening degree (?1) of an accelerator pedal (43) becomes off.

Abstract: A blow-by gas reduction device includes: a gas return pipe, one end of which is connected to an engine and the other end of which is connected to an intake pipe, to return a blow-by gas in the engine to an intake side; an oil separator that is connected to the gas return pipe; an oil return pipe that is connected to the oil separator and is disposed with an inclination so as to return the oil to an inside of the engine; and a check valve that is provided in the oil return pipe, wherein the oil return pipe between the oil separator and the check valve is formed such that that the oil return pipe located at the check valve side is located at a lower side everywhere as compared with the oil return pipe located at the oil separator side.

Abstract: A variable speed device that drives an electric motor includes a first acquiring unit that acquires a first parameter concerning an operation state of the electric motor, a second acquiring unit that acquires a second parameter concerning the operation state of the electric motor, the second parameter being related to the first parameter, a third acquiring unit that acquires a third parameter concerning a setting state of the electric motor, and a display control unit that simultaneously displays, on one display screen, a first display item corresponding to the acquired first parameter, a second display item corresponding to the acquired second parameter, and a third display item corresponding to the acquired third parameter. The display control unit graphically displays the first display item and the second display item in association with each other.

Abstract: Group III nitride crystal produced by cutting, from III nitride bulk crystal, a plurality of Group III nitride crystal substrates with major-surface plane orientation misoriented five degrees or less with respect to a crystal-geometrically equivalent plane orientation selected from the group consisting of {20-21}, {20-2-1}, {22-41}, and {22-4-1}, transversely arranging the substrates adjacent to each other such that their major surfaces are parallel to each other and such that their [0001] directions coincide with each other, and growing a Group III nitride crystal on the major surfaces. The Group III nitride crystal substrates are further characterized by satisfying at least either an oxygen-atom concentration of 1×1016 cm?3 to 4×1019 cm?3 or a silicon-atom concentration of 6×1014 cm?3 to 5×1018 cm?3, and by having a carrier concentration of 1×1016 cm?3 to 6×1019 cm?3.