Abstract: Provided is an air compressor that suppresses a rise in delivery temperature due to a change in atmospheric pressure, and consequently improves the life of parts. The air compressor 1 includes a motor 2, a compressor main body 3 driven by the motor 2 to compress air, a delivery pressure sensor 12 that senses a delivery pressure of the compressor main body 3, an atmospheric pressure sensor 13 that senses an atmospheric pressure, and a controller 15. The controller 15 compares the delivery pressure sensed by the delivery pressure sensor 12 with a set pressure, and performs operation control based on a result of the comparison. The controller 15 corrects the set pressure such that a ratio between the atmospheric pressure sensed by the atmospheric pressure sensor 13 and the set pressure becomes a set value set in advance.

Abstract: A package-type compressor is provided which reduces the leakage of noise generated by a heat exchanger without suppressing the flow rate of cooling air to an electric motor. The package-type compressor includes a cooling fan 12 that induces a flow of cooling air, an inlet duct 15A that introduces the cooling air from a cooling air inlet 13A to heat exchangers 3 to 6, a plurality of louvers 16 disposed in the inside of the inlet duct 15A, and another inlet duct 15B that introduces the cooling air from another cooling air inlet 13B to an electric motor 1. The cooling air inlet 13A is disposed such that the position thereof in the vertical direction is same as that of the heat exchangers 3 to 6.

Abstract: In order to reduce operation in a rotation-prohibited frequency range and to prevent resonance in a gas compressor wherein inverter control is performed, this gas compressor has: a compressor main body that compresses a gas; a motor that rotationally drives the compressor main body; an inverter that changes the rotational speed of the motor; a check valve arranged downstream from the compressor main body; a pressure detection means that detects load-side pressure downstream from the check valve; and a control device that, in accordance with the pressure detected by the pressure detection means, controls the frequency output by the inverter.

Abstract: A screw rotor which is hollow has improved performance against heat, pressure, rust, and the like. A screw rotor includes a screw portion of which an outer periphery has teeth and grooves having a helical shape and extending by a predetermined length in an axial direction. A radial cross section of at least a part of the screw portion includes a cross section of an outer surface portion forming the teeth and the grooves, a cross section of an axial center portion, a cross section of a support portion that connects an axial center side of the outer surface portion and an outer diameter side of the axial center portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial center side inner surface of a tooth bottom or a tooth tip.

Abstract: The invention prevents a decrease in strength of a screw rotor including a hollow portion and improves cooling performance.

Abstract: A screw rotor which is hollow has improved performance against heat, pressure, rust, and the like. A screw rotor includes a screw portion of which an outer periphery has teeth and grooves having a helical shape and extending by a predetermined length in an axial direction. A radial cross section of at least a part of the screw portion includes a cross section of an outer surface portion forming the teeth and the grooves, a cross section of an axial center portion, a cross section of a support portion that connects an axial center side of the outer surface portion and an outer diameter side of the axial center portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial center side inner surface of a tooth bottom or a tooth tip.

Abstract: In order to reduce operation in a rotation-prohibited frequency range and to prevent resonance in a gas compressor wherein inverter control is performed, this gas compressor has: a compressor main body that compresses a gas; a motor that rotationally drives the compressor main body; an inverter that changes the rotational speed of the motor; a check valve arranged downstream from the compressor main body; a pressure detection means that detects load-side pressure downstream from the check valve; and a control device that, in accordance with the pressure detected by the pressure detection means, controls the frequency output by the inverter.

Abstract: The invention prevents a decrease in strength of a screw rotor including a hollow portion and improves cooling performance.

Abstract: In order to reduce operation in a rotation-prohibited frequency range and to prevent resonance in a gas compressor wherein inverter control is performed, this gas compressor has: a compressor main body that compresses a gas; a motor that rotationally drives the compressor main body; an inverter that changes the rotational speed of the motor; a check valve arranged downstream from the compressor main body; a pressure detection means that detects load-side pressure downstream from the check valve; and a control device that, in accordance with the pressure detected by the pressure detection means, controls the frequency output by the inverter.

Abstract: A method includes: generating first information for each of a plurality of jobs based on temperature information acquired from a first information processing device that has executed each of the plurality of jobs, each of the first information indicating change amount of the temperature of the first information processing device when each of the jobs is executed by the first information processing device; generating second information for each of a plurality of second information processing devices that have executed a specific one of the plurality of jobs, the second information indicating change amount of the temperature of each of the second information processing devices which executed the specific job; and determining which one of the plurality of second information processing devices to allocate a job based on the first information, the second information and the temperature information of the plurality of second information processing devices.

Abstract: A method includes: generating first information for each of a plurality of jobs based on temperature information acquired from a first information processing device that has executed each of the plurality of jobs, each of the first information indicating change amount of the temperature of the first information processing device when each of the jobs is executed by the first information processing device; generating second information for each of a plurality of second information processing devices that have executed a specific one of the plurality of jobs, the second information indicating change amount of the temperature of each of the second information processing devices which executed the specific job; and determining which one of the plurality of second information processing devices to allocate a job based on the first information, the second information and the temperature information of the plurality of second information processing devices.

Abstract: A control device 10 at a main center, in order for an update carried out in an operation database device M to be also conducted in an operation database device S at a sub-center, generates and transmits a differential log file 16 to a control device 20 at the sub-center. The control device 20 at the sub-center, when receiving a differential log file 22, updates the operation database device S on the basis of the log information in the differential log file 22, and accumulates the log information in a recovery log file 26. The log information of a recovery point set at the main center is incorporated into this recovery log file 26.

Abstract: A route computing system is capable of computing routes at a high speed at a low cost without the need for replacing the hardware of a transmission device. The transmission device has a destination information receiving unit for receiving destination information indicative of the destination of a packet from a terminal device. The transmission device also has a destination information storing unit for storing the destination information, and a routing packet sending unit for receiving a routing protocol packet from another transmission device and sending the routing protocol packet to the terminal device. The terminal device has a routing packet receiving unit for receiving the routing protocol packet sent from the routing packet sending unit. The terminal device also has a computing unit for recomputing the destination information based on the routing protocol packet, and a destination information sending unit for sending the recomputed destination information to the destination information receiving unit.

Abstract: An alternator (AC generator), which is to be attached to an engine mounted to a vehicle, comprises an output terminal to which one end of a cable for supplying a battery with power generated by the alternator is coupled. The battery is mounted on the vehicle. The alternator further comprises an insulator, a guide, and a direction setting member. The insulator, made from an electric insulative material, is for protecting the output terminal. The guide guides the cable along a desired direction from the output terminal. The direction setting member enables the guide to selectively set a direction among a plurality of predetermined directions along which the cable is allowed to be guided.

Abstract: A control device 10 at a main center, in order for an update carried out in an operation database device M to be also conducted in an operation database device S at a sub-center, generates and transmits a differential log file 16 to a control device 20 at the sub-center. The control device 20 at the sub-center, when receiving a differential log file 22, updates the operation database device S on the basis of the log information in the differential log file 22, and accumulates the log information in a recovery log file 26. The log information of a recovery point set at the main center is incorporated into this recovery log file 26.

Abstract: An alternator (AC generator), which is to be attached to an engine mounted to a vehicle, comprises an output terminal to which one end of a cable for supplying a battery with power generated by the alternator is coupled. The battery is mounted on the vehicle. The alternator further comprises an insulator, a guide, and a direction setting member. The insulator, made from an electric insulative material, is for protecting the output terminal. The guide guides the cable along a desired direction from the output terminal. The direction setting member enables the guide to selectively set a direction among a plurality of predetermined directions along which the cable is allowed to be guided.

Abstract: A route computing system is capable of computing routes at a high speed at a low cost without the need for replacing the hardware of a transmission device. The transmission device has a destination information receiving unit for receiving destination information indicative of the destination of a packet from a terminal device. The transmission device also has a destination information storing unit for storing the destination information, and a routing packet sending unit for receiving a routing protocol packet from another transmission device and sending the routing protocol packet to the terminal device. The terminal device has a routing packet receiving unit for receiving the routing protocol packet sent from the routing packet sending unit. The terminal device also has a computing unit for recomputing the destination information based on the routing protocol packet, and a destination information sending unit for sending the recomputed destination information to the destination information receiving unit.