Abstract: An infrastructure diagnostic device according to an aspect of the present disclosure includes: at least one memory configured to store instructions; and at least one processor configured to execute the instructions to: generate a road section by dividing, by meshes, a movement path of a moving body collected from the moving body moving on a road, the meshes being obtained by dividing a ground surface into a predetermined size; and determine and output a state of the road section based on sensor information of the road section collected from the moving body.

Abstract: An ion exchanger unit that adsorbs impurities in a liquid to be tested, and a controller that switches between causing the flow of the liquid to be tested into the ion exchanger unit and the flow of eluent to elute the impurities adsorbed in the ion exchanger unit into the ion exchanger unit.

Abstract: A water treatment management apparatus used for monitoring and evaluating water supplied to a water treatment system such as an ultrapure water production system and performing appropriate management of operation of the water treatment system includes: a pure water production unit for evaluation to which water to be supplied to the water treatment system is supplied as target water, the pure water production unit for evaluation including a TOC removal apparatus for performing a unit operation of removing total organic carbon (TOC) components; and measuring means for measuring TOC concentration at a plurality of measurement points in the pure water production unit for evaluation, the plurality of the measurement points including an inlet and an outlet of the pure water production unit for evaluation.

Abstract: An infrastructure diagnostic device comprises a time-series display control unit, a reception unit, and a location display control unit. The time-series display control unit displays the infrastructure states of a plurality of locations in a predetermined area in time series on a display. The reception unit receives selection of data from among the time series for the infrastructure states of the plurality of locations. The location display control unit displays, on a map, a location corresponding to the selected data on the display.

Abstract: The analyzing method for quantifying urea in a sample solution includes: a pretreatment step of pretreating the sample solution with at least one of a membrane device including a reverse osmosis membrane and an ion exchange device including an ion exchanger; and an analyzing step of analyzing a target substance in the pretreated sample solution. The analyzing step is based on, for example, flow injection analysis (FIA), and includes a step of quantifying the target substance by measuring the absorbance of a liquid containing a substance generated by reacting the target substance with a reagent.

Abstract: An ultrapure water production system that has a simplified configuration and that can efficiently remove fine particles that are contained in ultrapure water is provided. Ultrapure water production system has ultrapure water supply line that is connected to point of use and that supplies ultrapure water to point of use; return line that returns the ultrapure water that has not been used at point of use to ultrapure water supply line; and at least one ion exchange apparatus that is provided on ultrapure water supply line. Space velocity of water to be treated that flows in final-stage ion exchange apparatus is 170 (1/hr) or more, and wherein final-stage ion exchange apparatus is an ion exchange apparatus that is closest to point of use from among at least one ion exchange apparatus.

Abstract: Distribution pipe for conducting ultrapure water from ultrapure water production facility to cleaning apparatus treatment unit provided on distribution pipe, distribution pipe for conducting ultrapure water to cleaning apparatus branches from distribution pipe between ultrapure water production facility and treatment unit, water amount controller provided in a first branch portion where distribution pipe branches from distribution pipe, water amount controller for controlling the ultrapure water supplied from distribution pipe to cleaning apparatus comparator for comparing a first amount of impurities contained in the ultrapure water treated by treatment unit with a second amount of impurities contained in the non-treated ultrapure water by treatment unit and flow path controller for controlling water amount controllers based on the results of the comparison.

Abstract: An optical fiber fusion splicer includes: a replaceable groove-formed unit having first positioning grooves, separated from each other by an equal distance, on which first optical fibers are disposed, and second positioning grooves, separated from each other by an equal distance, on which second optical fibers are disposed, wherein the first optical fibers constitute a first mass fiber and have first glass parts, and the second optical fibers constitute a second mass fiber and have second glass parts; a lighting part that illuminates, with light, the first optical fibers and the second optical fibers; a lens that condenses the light passing through the first glass parts and the second glass parts; a camera that captures an image formed by the lens; and a pair of discharge electrodes that heat and melt, by electric discharge, the first glass parts and the second glass parts.

Abstract: An apparatus for producing ultrapure water: first ultrafiltration membrane that is connected to point of use and that supplies ultrapure water to point of use; first concentrated water return line that returns concentrated water of first ultrafiltration membrane to an upstream side of first ultrafiltration membrane; pressure gauge that measures pressure at an outlet of first ultrafiltration membrane; and means for adjusting flow rate of the concentrated water (first valve). Means for adjusting the flow rate of the concentrated water can be operated such that when the flow rate of the concentrated water is changed, a change in the pressure at the outlet of first ultrafiltration membrane that is measured by pressure gauge is kept within a predetermined range.

Abstract: A water quality management method for performing at least one of a quantitative analysis and a qualitative analysis of fine particles contained in water to be analyzed that includes connecting a filtration device provided with a fine particle capturing membrane for capturing fine particles to a flow pipe through which the water to be analyzed flows, allowing the water to be analyzed to flow from the flow pipe and through the fine particle capturing membrane attached to the filtration device for a predetermined period of time to capture fine particles contained in the water to be analyzed to form a fine particle capturing membrane sample, and performing at least one of a quantitative analysis and a qualitative analysis of the fine particle capturing membrane sample of a target water flow period at an arbitrary timing.

Abstract: Fine particles that are contained in ultrapure water supplied to a point of use is further reduced. Ultrapure water production system has ultrapure water supply line that is connected to point of uses, wherein ultrapure water flows through ultrapure water supply line; and first ion exchange apparatus, membrane filtration apparatus and second ion exchange apparatus that are arranged in series on ultrapure water supply line. Membrane filtration apparatus is arranged between first ion exchange apparatus and second ion exchange apparatus. At least a part of the ultrapure water that flows out from membrane filtration apparatus is treated by second ion exchange apparatus before the at least a part of the ultrapure water is supplied to point of uses.

Abstract: The level of cleanliness of a hollow fiber membrane device is evaluated before it is installed in an ultrapure water production system. A method of evaluating the level of cleanliness of the hollow fiber membrane device includes capturing fine particles in permeating water by means of a first filter membrane, wherein the permeating water is ultrapure water that permeates through the hollow fiber membrane device before the hollow fiber membrane device is installed in an ultrapure water production system; and analyzing the fine particles that are captured by the filter membrane.

Abstract: A centrifugal filtration device is provided. The centrifugal filtration device has filtration membrane that filtrates liquid; cartridge that supports filtration membrane and that forms liquid chamber together with filtration membrane, wherein liquid chamber holds the liquid therein; and rotating member that rotates around rotation center and that supports cartridge such that filtration membrane is positioned outward of liquid chamber with respect to rotation center. Rotating member has a path that is connected to liquid chamber, and at least a part of a liquid contact part of the path that is in contact with the liquid is formed of titanium or a titanium alloy.

Abstract: A pairing method for determining communication partners among luminaires and wireless interface (IF) devices, including: generating provisional pairing data by assigning provisional addresses to the luminaires and the wireless IF devices indicated on the layout map and by associating the provisional addresses assigned to the wireless IF devices with the provisional addresses assigned to the luminaires in a one-to-many relationship; in a hardware installation phase in which the luminaires and the wireless IF devices are installed in accordance with the layout map, generating final pairing data by associating the provisional addresses in the provisional pairing data with pre-assigned actual addresses; and notifying the luminaires and the wireless IF devices of each of the actual addresses each is associated with in the final pairing data, and causing the luminaires and the wireless IF devices to store, as an actual address of a communication partner, each of the notified actual addresses.

Abstract: A water treatment management apparatus used for monitoring and evaluating water supplied to a water treatment system such as an ultrapure water production system and performing appropriate management of operation of the water treatment system includes: a pure water production unit for evaluation to which water to be supplied to the water treatment system is supplied as target water, the pure water production unit for evaluation including a TOC removal apparatus for performing a unit operation of removing total organic carbon (TOC) components; and measuring means for measuring TOC concentration at a plurality of measurement points in the pure water production unit for evaluation, the plurality of the measurement points including an inlet and an outlet of the pure water production unit for evaluation.

Abstract: The analyzing method for quantifying urea in a sample solution includes: a pretreatment step of pretreating the sample solution with at least one of a membrane device including a reverse osmosis membrane and an ion exchange device including an ion exchanger; and an analyzing step of analyzing a target substance in the pretreated sample solution. The analyzing step is based on, for example, flow injection analysis (FIA), and includes a step of quantifying the target substance by measuring the absorbance of a liquid containing a substance generated by reacting the target substance with a reagent.

Abstract: A method of analyzing a polarization-maintaining (PM) optical fiber includes illuminating a side of the PM optical fiber, physically rotating the PM optical fiber and measuring light intensity of light transmitted through the PM optical fiber to obtain an image profile, mathematically shifting the image profile at incremental rotation angles, expanding the image profile at each rotational angle into a Fourier series profile, and determining points of symmetry of the PM optical fiber based on the Fourier series profiles.

Abstract: Provided is a method of washing a hollow fiber membrane device which can efficiently remove fine particles while limiting the impact of an ultrapure water production system on the starting time. The method of washing a hollow fiber membrane device includes washing a hollow fiber membrane device with an alkaline aqueous solution before the hollow fiber membrane device is installed in an ultrapure water production system. The hollow fiber membrane device is washed by means of a washing device that is different from the ultrapure water production system.

Abstract: The level of cleanliness of a hollow fiber membrane device is evaluated before it is installed in an ultrapure water production system. A method of evaluating the level of cleanliness of the hollow fiber membrane device includes capturing fine particles in permeating water by means of a first filter membrane, wherein the permeating water is ultrapure water that permeates through the hollow fiber membrane device before the hollow fiber membrane device is installed in an ultrapure water production system; and analyzing the fine particles that are captured by the filter membrane.

Abstract: A centrifugal filtration device is provided. The centrifugal filtration device has filtration membrane that filtrates liquid; cartridge that supports filtration membrane and that forms liquid chamber together with filtration membrane, wherein liquid chamber holds the liquid therein; and rotating member that rotates around rotation center and that supports cartridge such that filtration membrane is positioned outward of liquid chamber with respect to rotation center. Rotating member has a path that is connected to liquid chamber, and at least a part of a liquid contact part of the path that is in contact with the liquid is formed of titanium or a titanium alloy.