Abstract: There are provided an operation number control device and a method for controlling the same that can level the operation times of the fluid machines, which are connected to the operation number control device. A fluid machine system comprises a plurality of fluid machines, and an operation number control device capable of individually controlling start and stop of the fluid machines. The operation number control device sets a continuous operation time for each of the fluid machines based on total operation times of the fluid machine and other fluid machines. When among fluid machines in operation, there is a fluid machine for which the continuous operation time set for the fluid machine has elapsed and there is a fluid machine at stop, the operation number control device causes the fluid machine at stop to start and causes the fluid machine to stop.

Abstract: A compressor includes: a casing that is formed in a cylindrical shape and has an opening portion that makes an inside and an outside of the casing communicate with each other at a lower portion in a vertical direction; a bundle that is accommodated inside the casing in a state of being insertable and removable in the axial direction; a first roller that is disposed at an end portion of a lower portion of the bundle and comes into contact with an inner peripheral surface of a lower portion of the casing; and a second roller that is disposed at the lower portion of the bundle at an interval from the first roller, and comes into contact with the inner peripheral surface of the lower portion of the casing.

Abstract: An ammonia plant synthesis gas compressor train includes a steam turbine; and a compression unit that compresses a synthesis gas by being rotationally driven by the steam turbine. The compression unit includes a rotary shaft that rotates around an axis, and a plurality of impellers that are provided on the rotary shaft at intervals in a direction of the axis and are rotated integrally with the rotary shaft to pump a gas outward in a radial direction to compress the gas. In at least one of the impellers, a maximum operating peripheral speed at a radially outermost position of the impeller is within a range of 290 m/s to 390 m/s, a yield strength is 827 MPa or less, and a Brinell hardness is 311 or less.

Abstract: To provide a novel resin having excellent dielectric properties, a method for producing the resin, a curable resin composition, and a cured product. The resin contains constituent units described in Group (1). R1 each independently represent a methylene group, a methylene oxy group, a methylene oxy methylene group, or an oxy methylene group. R2 and R3 each independently represent a halogen atom, an alkyl group having from 1 to 10 carbons, a halogenated alkyl group having from 1 to 10 carbons, a hydroxy alkyl group having from 1 to 10 carbons, or an aryl group having from 6 to 12 carbons. R4, R5, and R6 each independently represent a hydrogen atom, a halogen atom, an alkyl group having from 1 to 10 carbons, a halogenated alkyl group having from 1 to 10 carbons, a hydroxy group, a hydroxy alkyl group having from 1 to 10 carbons, or an aryl group having from 6 to 12 carbons.

Abstract: An impeller includes: a disk which is supported so as to be rotatable around an axis and which includes an outer peripheral surface expanding toward an outside in a radial direction of the disk as it goes to a downstream side in an axial direction of the axis; blades which are arranged on the outer peripheral surface of the disk at intervals in a circumferential direction of the disk; and a cover which is disposed at a position facing the outer peripheral surface of the disk so as to cover the blades. A leading edge of each of the blades includes: a straight portion which extends toward the downstream side in the axial direction of the axis as it goes to the disk from the cover; and a protrusion portion close to the disk and which is protruded from an extension of the straight portion.

Abstract: A compressor includes: a casing that is formed in a cylindrical shape and has an opening portion that makes an inside and an outside of the casing communicate with each other at a lower portion in a vertical direction; a bundle that is accommodated inside the casing in a state of being insertable and removable in the axial direction; a first roller that is disposed at an end portion of a lower portion of the bundle and comes into contact with an inner peripheral surface of a lower portion of the casing; and a second roller that is disposed at the lower portion of the bundle at an interval from the first roller, and comes into contact with the inner peripheral surface of the lower portion of the casing.

Abstract: The impeller includes a disc having a main surface extending outward in a radial direction toward one side in an axial direction, a plurality of blades defining a flow path extending to an outlet on one side from an inlet on the other side in the axial direction, and a cover disposed to cover the plurality of blades. At least one of an inlet side region and an outlet side region which are a connection portion between the blade and the main surface and a connection portion between the blade and the cover has a small fillet portion curved in an arc shape and having a small radius of curvature. An intermediate region formed between the inlet side region and the outlet side region has a large fillet portion having a large radius of curvature.

Abstract: A centrifugal compressor includes a rotary shaft rotating around an axis, and a plurality of impellers fixed to and integrally rotating with the rotary shaft so that a gas flowing from an upstream side in an axial direction is compressed by being pumped outward in a radial direction. At least one of the plurality of impellers has a design point of a flow rate coefficient ? which is 0.1 to 0.2, and a machine Mach number M0 of 1.1 to 1.3 and is configured to be operable between a flow rate coefficient minimum value ?min and a flow rate coefficient maximum value ?max. An operation range expressed by the following Equation (a) is 30% or higher, (Operation Range)={(Flow Rate Coefficient Maximum Value ?max)?(Flow Rate Coefficient Minimum Value ?min)}/(Flow Rate Coefficient Maximum Value ?max)?? (a).

Abstract: The impeller includes a disc having a main surface extending outward in a radial direction toward one side in an axial direction, a plurality of blades defining a flow path extending to an outlet on one side from an inlet on the other side in the axial direction, and a cover disposed to cover the plurality of blades. At least one of an inlet side region and an outlet side region which are a connection portion between the blade and the main surface and a connection portion between the blade and the cover has a small fillet portion curved in an arc shape and having a small radius of curvature. An intermediate region formed between the inlet side region and the outlet side region has a large fillet portion having a large radius of curvature.

Abstract: An ammonia plant synthesis gas compressor train includes a steam turbine; and a compression unit that compresses a synthesis gas by being rotationally driven by the steam turbine. The compression unit includes a rotary shaft that rotates around an axis, and a plurality of impellers that are provided on the rotary shaft at intervals in a direction of the axis and are rotated integrally with the rotary shaft to pump a gas outward in a radial direction to compress the gas. In at least one of the impellers, a maximum operating peripheral speed at a radially outermost position of the impeller is within a range of 290 m/s to 390 m/s, a yield strength is 827 MPa or less, and a Vickers hardness is 311 or less.

Abstract: A centrifugal compressor includes a rotary shaft rotating around an axis, and a plurality of impellers fixed to and integrally rotating with the rotary shaft so that a gas flowing from an upstream side in an axial direction is compressed by being pumped outward in a radial direction. At least one of the plurality of impellers has a design point of a flow rate coefficient ? which is 0.1 to 0.2, and a machine Mach number M0 of 1.1 to 1.3 and is configured to be operable between a flow rate coefficient minimum value ?min and a flow rate coefficient maximum value ?max. An operation range expressed by the following Equation (a) is 30% or higher, (Operation Range)={(Flow Rate Coefficient Maximum Value ?max)?(Flow Rate Coefficient Minimum Value ?min)}/(Flow Rate Coefficient Maximum Value ?max)??(a).

Abstract: An impeller includes: a disk which is supported so as to be rotatable around an axis and which includes an outer peripheral surface expanding toward an outside in a radial direction of the disk as it goes to one side in an axial direction of the axis; a plurality of blades which are arranged on the outer peripheral surface of the disk at intervals in a circumferential direction of the disk; and a cover which is disposed at a position facing the outer peripheral surface of the disk so as to cover the plurality of blades. A leading edge of the blade includes: a straight portion which extends so as to be close to one side in the axial direction from the cover toward the disk; and a scooped portion which is receded in relation to the straight portion and of which at least a portion close to the disk is formed in an arc shape when viewed from the circumferential direction.

Abstract: A chemical substance concentrator includes a channel allowing a sample containing a chemical substance to flow in a flowing direction in the channel, and a cell wall partitioning the channel into adsorption cells. Each of adsorption cells includes first and second electrodes disposed on the cell wall apart from each other and an adsorption device that adsorbs the chemical substance. The adsorption device contains metal oxide. The absorption device is disposed at a position contacting the first electrode and the second electrode such that the first and second electrodes are electrically connected via the adsorption device.

Abstract: An asymmetric membrane including a crosslinked polyimide resin, the crosslinked polyimide resin being formed by crosslinking a polyimide resin by a crosslinking agent; the polyimide resin including a structural unit (A) derived from tetracarboxylic dianhydride and a structural unit (B) derived from diamine; the structural unit (A) including a structural unit (A-1) derived from a compound represented by Formula (a-1); the structural unit (B) including a structural unit (B-1) derived from Formula (b-1), and a proportion of the structural unit (B-1) per 100 mol % of the structural unit (B) being from 0.1 to 50 mol %; and the crosslinking agent being a compound having not less than two functional groups that bond with carboxy groups. In Formula (b-1), Q1 and Q2 are each independently a group including an aromatic group, an aliphatic hydrocarbon group, and/or an alicyclic hydrocarbon group; X is a single bond or a particular group.

Abstract: A valve system includes: a valve device with a flow path and a valve body that opens and closes the flow path; and a drive mechanism that drives the valve body. The drive mechanism includes: a cylinder case; a cylinder chamber that extends in an axis direction and is formed inside the cylinder case; a piston that divides the cylinder chamber into a first chamber on a first side in the axis direction and a second chamber on a second side in the axis direction; an inflow port through which working fluid flows to the inside of the first chamber; an elastic member disposed inside the second chamber and that pushes the piston to the first side; a bypass passage that connects the first chamber and the second chamber; and an on-off valve that opens and closes the bypass passage.

Abstract: An object is to provide an electrophoretic support body and an electrophoretic device which allow a potential of hydrogen (pH) to be easily and reproducibly adjusted. The electrophoretic support body in the present disclosure is an electrophoretic support body including a plurality of fibers, the plurality of fibers form a fibrous body having a void in the fibrous body, and the plurality of fibers include a metal oxide having a predetermined isoelectric point. The electrophoretic device in the present disclosure includes a container, a pair of first electrodes provided in the container, and a first electrophoretic support body disposed between the pair of first electrodes, the first electrophoretic support body includes a fibrous body that is formed of a plurality of fibers and has a void in the fibrous body, and the plurality of fibers include a metal oxide having a predetermined isoelectric point.

Abstract: An asymmetric membrane including a crosslinked polyimide resin, the crosslinked polyimide resin being formed by crosslinking a polyimide resin by a crosslinking agent; the polyimide resin including a structural unit (A) derived from tetracarboxylic dianhydride and a structural unit (B) derived from diamine; the structural unit (A) including a structural unit (A-1) derived from a compound represented by Formula (a-1); the structural unit (B) including a structural unit (B-1) derived from Formula (b-1), and a proportion of the structural unit (B-1) per 100 mol % of the structural unit (B) being from 0.1 to 50 mol %; and the crosslinking agent being a compound having not less than two functional groups that bond with carboxy groups. In Formula (b-1), Q1 and Q2 are each independently a group including an aromatic group, an aliphatic hydrocarbon group, and/or an alicyclic hydrocarbon group; X is a single bond or a particular group.

Abstract: A method for separating an alkyl aromatic hydrocarbon, the method having a step of adding a first diluent and an extractant having a superacid to a mixture comprising the alkyl aromatic hydrocarbon and one or more isomers thereof to carry out an acid-base extraction to thereby form a complex of the alkyl aromatic hydrocarbon with the superacid, and thereafter separating the complex from the mixture, and a step of adding an eliminating agent having a relative basicity in a range of 0.06 to 10 with respect to the alkyl aromatic hydrocarbon and a second diluent to the complex, and carrying out complex exchange of the alkyl aromatic hydrocarbon for the eliminating agent to thereby separate the alkyl aromatic hydrocarbon from the complex.

Abstract: An examination device for a substance of biological origin includes: a base; a placing area for placing the substance of biological origin, the placing area being on a first surface of the base; a first monitor electrode; and a second monitor electrode, wherein a shortest distance from a center of the placing area to the first monitor electrode and a shortest distance from the center of the placing area to the second monitor electrode are different.

Abstract: A valve system includes: a valve device with a flow path and a valve body that opens and closes the flow path; and a drive mechanism that drives the valve body. The drive mechanism includes: a cylinder case; a cylinder chamber that extends in an axis direction and is formed inside the cylinder case; a piston that divides the cylinder chamber into a first chamber on a first side in the axis direction and a second chamber on a second side in the axis direction; an inflow port through which working fluid flows to the inside of the first chamber; an elastic member disposed inside the second chamber and that pushes the piston to the first side; a bypass passage that connects the first chamber and the second chamber; and an on-off valve that opens and closes the bypass passage.