Abstract: The steel material includes a chemical composition containing, in mass %, C: 0.15 to 0.45%, Si: 0.50% or less, Mn: 0.20 to 0.60%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfying Formula (1) to Formula (4) described in Embodiment, wherein, in its microstructure, a total area fraction of ferrite and pearlite is 10.0% or more, and a proportion of a content of V (mass %) in electrolytic extraction residue to the content of V (mass %) in the chemical composition is 10.0% or less.

Abstract: An ultrasonic inspection device includes: a longitudinal ultrasonic sensor configured to emit and receive a longitudinal ultrasonic wave; and an ultrasonic transducer unit made of metal and having the shape of a polyhedron. The ultrasonic transducer unit includes: an output surface configured to be disposed facing an object to be inspected; an input surface on which the longitudinal ultrasonic sensor is disposed; and a conversion surface configured to, when the longitudinal ultrasonic wave input through the input surface is reflected by the conversion surface, convert the longitudinal ultrasonic wave into a transverse ultrasonic wave such that the transverse ultrasonic wave propagates toward the output surface, the conversion surface being tilted at a predetermined angle with respect to an in-plane direction of the output surface. Thermal conductivity of the ultrasonic transducer unit is lower than thermal conductivity of the object to be inspected.

Abstract: The die casting machine includes: a sleeve with tubular shape, the sleeve communicating with inner space of a die casting mold; a plunger disposed in the sleeve, the plunger moving along a central axis of the sleeve; a sensor for measuring pressure of the inner space of the die casting mold; and a controller programmed to perform an airtight inspection of the die casting mold, during outside a molding period of a die casting product by the die casting machine; in the airtight inspection, wherein the controller is programmed to: pump gas in the sleeve to the inner space, or suck gas in the inner space into the sleeve, by moving the plunger in a clamping state, wherein the clamping state is a state of the die casting mold being clamped; obtain the pressure of the inner space from the sensor; determine an abnormality in airtightness of the die casting mold using measurement result of the pressure of the inner space.

Abstract: A casting mold includes a carbon film with which at least a surface of the casting mold which forms a cavity is covered, and mold oil with which a surface of the carbon film is coated. In the casting mold, aluminum powder is added to the mold oil.

Abstract: A casting mold includes a carbon film with which at least a surface of the casting mold which forms a cavity is covered, and mold oil with which a surface of the carbon film is coated. In the casting mold, aluminum powder is added to the mold oil.

Abstract: A cryopump comprises a cryopanel that cools and thus condenses or adsorbs gas, and a pump housing that contains the cryopanel. a regeneration process of the cryopump includes a basic purge process, an evacuation processes, and an optional purge process that is executed additionally if required. The optional purge process includes one or more gas purge steps. In a cryopump control apparatus that controls the cryopump, a deterioration evaluation unit determines whether a re-purge number, which is the total number of gas purge steps that are required to be executed in one regeneration process, reaches a deterioration evaluation criteria number.

Abstract: An optical isolator including a Faraday rotator that has a high Faraday effect and a high transmission factor in a wavelength used is provided. An optical isolator comprises at least: a Faraday rotator; a polarizer arranged on a light incidence side of the Faraday rotator; and an analyzer arranged on a light exit side of the Faraday rotator, wherein the Faraday rotator consists of an oxide that contains an ytterbium oxide (Yb2O3) with a mass ratio of 30% or more.

Abstract: A cryopump is provided with: a refrigerator that generates a cold state by a heat cycle in which an operating gas inhaled inside is expanded and discharged; a heat shield thermally connected to the refrigerator so as to be cooled to a target temperature; and a control unit that determines a command value for a heat cycle frequency such that a temperature of the heat shield follows the target temperature, and provides the command value to the refrigerator. The control unit estimates whether the refrigerator outputs a refrigerating capacity corresponding to the command value for the frequency based on a flow rate of the operating gas.

Abstract: A cryopump comprises a cryopanel that cools and thus condenses or adsorbs gas, and a pump housing that contains the cryopanel. a regeneration process of the cryopump includes a basic purge process, an evacuation processes, and an optional purge process that is executed additionally if required. The optional purge process includes one or more gas purge steps. In a cryopump control apparatus that controls the cryopump, a deterioration evaluation unit determines whether a re-purge number, which is the total number of gas purge steps that are required to be executed in one regeneration process, reaches a deterioration evaluation criteria number.

Abstract: A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet.

Abstract: An optical isolator including a Faraday rotator that has a high Faraday effect and a high transmission factor in a wavelength used is provided. An optical isolator comprises at least: a Faraday rotator; a polarizer arranged on a light incidence side of the Faraday rotator; and an analyzer arranged on a light exit side of the Faraday rotator, wherein the Faraday rotator consists of an oxide that contains an ytterbium oxide (Yb2O3) with a mass ratio of 30% or more.

Abstract: A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet.

Abstract: A cryopump is provided with: a refrigerator that generates a cold state by a heat cycle in which an operating gas inhaled inside is expanded and discharged; a heat shield thermally connected to the refrigerator so as to be cooled to a target temperature; and a control unit that determines a command value for a heat cycle frequency such that a temperature of the heat shield follows the target temperature, and provides the command value to the refrigerator. The control unit estimates whether the refrigerator outputs a refrigerating capacity corresponding to the command value for the frequency based on a flow rate of the operating gas.

Abstract: A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet.

Abstract: A coreless and brushless direct-current motor includes an armature coil wound without core and formed in the shape of a saddle; an outside rotor magnet formed by a permanent magnet, the outside rotor magnet being provided at an outside of the armature coil in the shape of a cylinder so as to face the armature coil, the outside rotor magnet being rotated by the magnetic field; an inside rotor magnet formed by a permanent magnet, the inside rotor magnet being provided in the shape of a cylinder at an inside of the armature coil so that the inside rotor magnet has a pole opposite to the outside rotor magnet and a rotational shaft is independently provided; an output shaft connected to the inside rotor magnet; and a sealing part of a barrier structure which sealing part partitions the armature coil and the outside rotor magnet to an outside of the inside rotor magnet and seals the armature coil and the outside rotor magnet.

Abstract: A cryogenic refrigerator includes a first refrigerant tube and a second refrigerant tube each comprising two tubes that are arranged on a cooling stage substantially parallel to each other and communicate with each other through a gas passage formed in the cooling stage. Phase differences are provided to oscillating gas pressures in the first and second refrigerant tubes, to cancel vibration of the cooling stage. Thus, the cryogenic refrigerator can be provided which can effectively reduce the vibration of the cooling stage caused by the oscillating gas pressure and can reduce the size thereof.

Abstract: A method of measuring the heat conductivity of an object to be measured, comprising generating heat between the object to be measured and a heat resistant material, causing heat to flow through the interior of the object to be measured and the interior of the heat resistant material and obtaining the heat conductivity of the object to be measured from a temperature difference between at least two points of the heat resistant material, a heat conductivity measuring instrument using the same and a method of producing a heat insulating material.

Abstract: A cryogenic refrigerator includes a first refrigerant tube and a second refrigerant tube each comprising two tubes that are arranged on a cooling stage substantially parallel to each other and communicate with each other through a gas passage formed in the cooling stage. Phase differences are provided to oscillating gas pressures in the first and second refrigerant tubes, to cancel vibration of the cooling stage. Thus, the cryogenic refrigerator can be provided which can effectively reduce the vibration of the cooling stage caused by the oscillating gas pressure and can reduce the size thereof.

Abstract: There are provided a housing that has a generally cylindrical-shaped internal circumferential surface, a housing passage that includes a high-pressure gas passage and a low-pressure gas passage which are formed on the housing surface, a generally cylindrical-shaped rotor that is supported by bearings, and which rotates with a micro-clearance away from the internal circumferential surface of the housing without touching the housing, and a rotor passage that is formed inside the rotor, and through which gas flows at the time its openings align with the valve housing passage. Load to the rotating axis of the rotor due to the pressure of the supplied gas to the valve is cancelled, and the clearance between the rotor and the housing are maintained at a proper level, by installing pluralities of high-pressure gas supply ports and low-pressure gas supply ports of the housing in symmetrical positions relative to the rotating axis of the rotor.

Abstract: A method of measuring the heat conductivity of an object to be measured, comprising generating heat between the object to be measured and a heat resistant material, causing heat to flow through the interior of the object to be measured and the interior of the heat resistant material and obtaining the heat conductivity of the object to be measured from a temperature difference between at least two points of the heat resistant material, a heat conductivity measuring instrument using the same and a method of producing a heat insulating material.