Abstract: A light source (12) outputs a light (L1). A branching unit (13) branches the light (L1) output from the light source (12) into a first branched light (L2) and a local oscillation light (LO). A modulator (14) modulates the first branched light (L2) to output an optical signal (LS1). A receiver (15) causes the local oscillation light (LO) to interfere with an optical signal (LS2) to receive the optical signal (LS2). An EDFA (16) amplifies the optical signal (LS1) output from the modulator (14). An excitation light source (17) outputs an excitation light (Le) exciting the EDFA (16) to the EDFA (16). An optical attenuator (18) attenuates optical power of the optical signal (LS1) amplified by the EDFA (16). A control unit (11) controls attenuation of the optical signal (LS1) in the optical attenuator (18). The control unit (11) adjusts the attenuation of the optical signal (LS1) and adjusts an output of the excitation light (Le) from the excitation light source (17).

Abstract: Provided is a single-fiber bi-directional optical transceiver sub-assembly capable of improving the wavelength separation characteristics of a multiplexing/demultiplexing filter while also attaining a compact size. A single-fiber bi-directional optical transceiver sub-assembly is provided with a housing, an optical receptacle, a multiplexing/demultiplexing filter, a receiving-side photoelectric converter, a transmitting-side photoelectric converter, an isolator, and a collimating lens. The multiplexing/demultiplexing filter is disposed on the optical path between the optical receptacle and the transmitting-side photoelectric converter and on the optical path between the optical receptacle and the receiving-side photoelectric converter. The isolator passes optical signals outputted from the transmitting-side photoelectric converter and blocks optical signals proceeding to the transmitting-side photoelectric converter.

Abstract: A centrifugal compressor comprises: an impeller; an inlet pipe portion forming an intake passage to introduce air to the impeller; and a throttle mechanism capable of reducing a flow passage area of the intake passage upstream of the impeller. The throttle mechanism includes an annular portion configured to move between a first position and a second position upstream of the first position in an axial direction of the impeller. In a cross-section along a rotational axis of the impeller, an outer peripheral surface of the annular portion is formed to smoothly connect a leading edge and a trailing edge of the annular portion.

Abstract: A centrifugal compressor includes: an impeller; an inlet pipe portion forming an intake passage to introduce air to the impeller; and a throttle mechanism capable of reducing a flow passage area of the intake passage upstream of the impeller. The throttle mechanism includes an annular portion configured to move between a first position and a second position upstream of the first position in an axial direction of the impeller, and a strut supporting the annular portion. The strut extends toward at least one of an outer side in a radial direction of the impeller or a downstream side in the axial direction of the impeller with an increase in distance from the annular portion.

Abstract: A vaned diffuser provided on a downstream side of an impeller of a centrifugal compressor. The vaned diffuser includes: a diffuser passage forming portion having a hub-side surface and a shroud-side surface and forming an annular diffuser passage on a downstream side of the impeller; and a plurality of diffuser vanes provided in the diffuser passage at intervals in a circumferential direction of the impeller. A fillet is formed in a connection portion between each of the diffuser vanes and at least one of the hub-side surface and the shroud-side surface. Also, where R is a radius of the fillet and b is a vane height of each of the diffuser vanes, and a maximum value of R/b on a downstream side of a throat position of the diffuser passage is larger than a maximum value of R/b on an upstream side of the throat position of the diffuser passage.

Abstract: Provided is a method for producing lithium carbonate from lithium ion battery waste, the lithium ion battery waste including battery positive material components containing Li and at least one metal selected from the group consisting of Co, Ni and Mn, wherein, after subjecting the lithium ion battery waste to a wet process, thereby separating the at least one metal of the battery positive material components from the lithium ion battery waste to obtain crude lithium carbonate, the method includes: a dissolution step of dissolving the crude lithium carbonate in a liquid while feeding a carbon dioxide gas; and a decarbonization step of heating a lithium dissolved solution obtained in the dissolution step to release carbonic acid, and wherein when dissolving the crude lithium carbonate in the liquid in the dissolution step, the liquid is stirred in a reaction vessel using a stirrer, and a ratio of a diameter (d) of a stirring blade of the stirrer to an inner diameter (D) of the reaction vessel (d/D) is from 0.

Abstract: A scroll casing forms a scroll flow passage of a centrifugal compressor, and provided that, in a cross section of the scroll flow passage, Ei is an inner end of the scroll flow passage in a radial direction of the centrifugal compressor, and Mh is a middle point of a maximum flow-passage height Hmax of the scroll flow passage in the axial direction of the centrifugal compressor, the scroll flow passage has a separation suppressing cross section in which the inner end Ei is disposed on an inner side, in the radial direction, of a diffuser outlet, and the inner end Ei is disposed on a back side, in the axial direction, of the middle point Mh, in a section disposed at least partially in an upstream region of a connection position of a scroll start and a scroll end.

Abstract: A compressor scroll (1A) is provided with: a scroll-flow-path formation part (8A) that forms a scroll flow path; and an outlet-flow-path formation part (9) that is connected to a winding-end section (11) of a scroll flow path (8a) and that forms an outlet flow path (9a) extending in a direction tangential to a circle around an axis (O), wherein, at least at the winding-end section (11) in an area where a winding-start section (10) intersects with the winding-end section (11), the scroll-flow-path formation part (8A) is provided with a bulging part (15A) that bulges the scroll flow path in the radial direction toward the side where the winding-start section (10) is present.

Abstract: A centrifugal compressor operable in a wide operation range under a condition accompanied with pulsations of a pressure and a flow rate. The centrifugal compressor has a casing including at least one recirculation channel that includes a first inlet slit connected to an air flow passage on a downstream side of a leading edge in an air flow direction of the air flow passage, a second inlet slit connected to the air flow passage on a downstream side of the first inlet slit in the air flow direction of the air flow passage, a first vane disposed on a downstream side of the first inlet slit or in the first inlet slit in the at least one recirculation channel, and a second vane disposed on a downstream side of the second inlet slit or in the second inlet slit in the at least one recirculation channel.

Abstract: A light source (12) outputs a light (L1). A branching unit (13) branches the light (L1) output from the light source (12) into a first branched light (L2) and a local oscillation light (LO). A modulator (14) modulates the first branched light (L2) to output an optical signal (LS1). A receiver (15) causes the local oscillation light (LO) to interfere with an optical signal (LS2) to receive the optical signal (LS2). An EDFA (16) amplifies the optical signal (LS1) output from the modulator (14). An excitation light source (17) outputs an excitation light (Le) exciting the EDFA (16) to the EDFA (16). An optical attenuator (18) attenuates optical power of the optical signal (LS1) amplified by the EDFA (16). A control unit (11) controls attenuation of the optical signal (LS1) in the optical attenuator (18). The control unit (11) adjusts the attenuation of the optical signal (LS1) and adjusts an output of the excitation light (Le) from the excitation light source (17).

Abstract: A pluggable optical connector is configured to be insertable into and removable from an optical communication apparatus, and to be capable of communicating a modulation signal and a data signal with the optical communication apparatus. A wavelength-tunable light source is configured to output an output light and a local oscillation light. An optical transmission unit is configured to output an optical signal generated by modulating the output light in response to the modulation signal. An optical reception unit is configured to demodulate an optical signal received by using the local oscillation light to the data signal. Pluggable optical receptors are configured in such a manner that an optical fiber is insertable into and removable from the pluggable optical receptors, and configured to be capable of outputting the optical signal to the optical fiber and transferring the optical signal received thorough the optical fiber to the optical reception unit.

Abstract: A vaned diffuser provided on a downstream side of an impeller of a centrifugal compressor. The vaned diffuser includes: a diffuser passage forming portion having a hub-side surface and a shroud-side surface and forming an annular diffuser passage on a downstream side of the impeller; and a plurality of diffuser vanes provided in the diffuser passage at intervals in a circumferential direction of the impeller. A fillet is formed in a connection portion between each of the diffuser vanes and at least one of the hub-side surface and the shroud-side surface. Also, where R is a radius of the fillet and b is a vane height of each of the diffuser vanes, and a maximum value of R/b on a downstream side of a throat position of the diffuser passage is larger than a maximum value of R/b on an upstream side of the throat position of the diffuser passage.

Abstract: A light source outputs a light. A branching unit branches the light output from the light source into a first branched light and a local oscillation light. A modulator modulates the first branched light to output an optical signal. A receiver causes the local oscillation light to interfere with an optical signal to receive the optical signal. An EDFA amplifies the optical signal output from the modulator. An excitation light source outputs an excitation light exciting the EDFA to the EDFA. An optical attenuator attenuates optical power of the optical signal amplified by the EDFA. A control unit controls attenuation of the optical signal in the optical attenuator. The control unit adjusts the attenuation of the optical signal and adjusts an output of the excitation light from the excitation light source.

Abstract: A turbomachinery according to an embodiment includes an impeller including at least one blade, and a casing for housing the impeller rotatably. A size of a gap between a tip of the blade and an inner surface of the casing during a stop of the impeller is formed non-uniformly over a circumferential direction of the impeller.

Abstract: A pluggable optical connector is configured to be insertable into and removable from an optical communication apparatus, and to be capable of communicating a modulation signal and a data signal with the optical communication apparatus. A wavelength-tunable light source is configured to output an output light and a local oscillation light. An optical transmission unit is configured to output an optical signal generated by modulating the output light in response to the modulation signal. An optical reception unit is configured to demodulate an optical signal received by using the local oscillation light to the data signal. Pluggable optical receptors are configured in such a manner that an optical fiber is insertable into and removable from the pluggable optical receptors, and configured to be capable of outputting the optical signal to the optical fiber and transferring the optical signal received thorough the optical fiber to the optical reception unit.

Abstract: A centrifugal compressor includes an impeller and a casing, the casing includes a scroll part forming a scroll flow passage and a diffuser part forming a diffuser flow passage. The diffuser part includes: a first diffuser portion belonging to a first angular range in a circumferential direction of the impeller; and a second diffuser portion belonging to a second angular range downstream of the first angular range in a flow direction of the scroll flow passage, of the angular range in the circumferential direction of the impeller, the second diffuser portion having an outer radius R2 which is defined along a reference circle centered at a rotational center of the impeller. An outer radius R1 of the first diffuser portion in the first angular range is smaller than the outer radius R2 of the second diffuser portion in the second angular range.

Abstract: An impeller for a centrifugal compressor includes a plurality of blades arranged around a hub, and on a trailing edge of the blade, a blade angle at a first position on a shroud side from a center position in a span direction of the blade is larger than a blade angle at a second position on a hub side from the center position.

Abstract: An impeller wheel according to an embodiment includes a hub, a plurality of long blades disposed on a circumferential surface of the hub, the plurality of long blades extending from an inlet portion to an outlet portion of fluid and a plurality of short blades each disposed on the circumferential surface of the hub, the plurality of short blades extending from a downstream side of leading edges of the plurality of the long blades to the outlet portion in a flow passage formed between adjacent long blades of the plurality of long blades. In the impeller wheel, an expression ?2s,full<?2s,spl is satisfied, where ?2s,full and ?2s,spl are respectively blade angles on tip side edges of the plurality of long blades and the plurality of short blades at the outlet portion.

Abstract: A centrifugal compressor operable in a wide operation range under a condition accompanied with pulsations of a pressure and a flow rate. The centrifugal compressor has a casing including at least one recirculation channel that includes a first inlet slit connected to an air flow passage on a downstream side of a leading edge in an air flow direction of the air flow passage, a second inlet slit connected to the air flow passage on a downstream side of the first inlet slit in the air flow direction of the air flow passage, a first vane disposed on a downstream side of the first inlet slit or in the first inlet slit in the at least one recirculation channel, and a second vane disposed on a downstream side of the second inlet slit or in the second inlet slit in the at least one recirculation channel.

Abstract: A method for dissolving a lithium compound according to the present invention includes bringing a lithium compound into contact with water or an acidic solution, and feeding, separately from the lithium compound, a carbonate ion to the water or the acidic solution to produce carbonic acid, and allowing the carbonic acid to react with the lithium compound to produce lithium hydrogen carbonate.