Abstract: The present utility model relates to the technical field of heat exchangers, and disclosed are a tube sheet built-in type structure and a spiral-flow type wound tube heat exchanger. The heat exchanger to which the tube sheet built-in type structure is applicable is provided with a housing, and comprises: a tube sheet provided inside the housing, the tube sheet being not in direct contact with the housing. According to the present utility model, the built-in type tube sheet structure is used, the tube sheet is arranged inside the housing, and the tube sheet is not directly connected to the housing, thereby reducing the longitudinal length of the device and the circumferential outreach dimensions of connecting tubes.

Abstract: measuring scattering properties of a particulate matter. The experimental device includes a detachably arranged laser device, an incident light passage, a scattered light passage, a photodetector and a spherical scattering cavity, wherein the laser device, the incident light passage and the scattered light passage can rotate 360 degrees around the spherical scattering cavity for any angle adjustment. The invention can perform multi-light-source and multi-angle laser incidence and multi-angle detector detection so as to obtain scattering information of particulate matters in various samples to be measured.

Abstract: Disclosed are a single-phase-to-ground protection method and system for an active power distribution network. The method includes: acquiring current and voltage data of a line in real time by means of a power distribution terminal, and calculating active power of the line; recording and storing the active power of the line to form an active power curve; performing data statistics according to the active power curve; calculating a direction compensation coefficient and a zero-sequence current compensation coefficient on the basis of statistical data; and detecting whether a single-phase-to-ground fault occurs to the line, where when the single-phase-to-ground fault occurs to the line, a transient-state zero-sequence direction and a steady-state zero-sequence direction are compensated, or a zero-sequence current is compensated, it is determined that the single-phase-to-ground fault occurs to the line when compensation results satisfy action conditions, and tripping is performed or an alarm is given.

Abstract: The disclosure provides a repairing material for emergency treatment of a black and odorous surface water environment and its preparation method, belonging to the fields of environmental science and engineering technology. The preparation method of the disclosure specifically includes the following steps: (1) uniformly stirring activated carbon, calcium chloride, ammonia water solution, polyethylene glycol and water in a stirrer, then dropwise adding hydrogen peroxide, and after the completion of the dropwise adding, obtaining a calcium peroxide repairing material solution; (2) adding a sodium hydroxide solution to the calcium peroxide repairing material solution obtained in step (1) until a pH reaches 11.5, thereby obtaining a suspension; (3) centrifuging the suspension in step (2) to obtain a solid; and (4) washing the solid in step (3) with distilled water until a final pH of residual water reaches 8.4, and then drying the obtained precipitate to obtain the repairing material.

Abstract: Disclosed are a single-phase-to-ground protection method and system for an active power distribution network. The method includes: acquiring current and voltage data of a line in real time by means of a power distribution terminal, and calculating active power of the line; recording and storing the active power of the line to form an active power curve; performing data statistics according to the active power curve; calculating a direction compensation coefficient and a zero-sequence current compensation coefficient on the basis of statistical data; and detecting whether a single-phase-to-ground fault occurs to the line, where when the single-phase-to-ground fault occurs to the line, a transient-state zero-sequence direction and a steady-state zero-sequence direction are compensated, or a zero-sequence current is compensated, it is determined that the single-phase-to-ground fault occurs to the line when compensation results satisfy action conditions, and tripping is performed or an alarm is given.

Abstract: Dental whitening compositions, kits and systems exhibiting stability in viscosity and hydrogen peroxide concentration for an extended shelf life without refrigeration or other special storage conditions are provided herein. The composition may be in gel form and comprise a hydrogen peroxide or a hydrogen peroxide precursor, and a thickening agent comprising a crosslinked and/or water insoluble N-vinyl heterocyclic homo- or copolymer. In some aspects, a kit may be provided comprising a two-part dental whitening system, wherein one part comprises a whitening agent, and a separate part comprises a strong base.

Abstract: Provided is a surface treatment method of metal powder and surface passivated metal powder. Herein, the surface treatment method uses passivation solution to treat the metal powder, to form a passivation film on the surface of the metal powder; the passivation solution passes through the metal powder by a flowing method; and the average particle size of the metal powder is 0.1˜100 ?m. A problem in the prior art that the metal powder is easily oxidized is solved, and it is suitable for the field of metal anti-oxidation.

Abstract: The present disclosure provides a rare earth ion-doped soft magnetic alloy, a soft magnetic composite material and a preparation method thereof. The rare earth ion-doped soft magnetic alloy is composed of Fe, Si, Al, N and Re, and the Re is a rare earth element; and herein, in the rare earth ion-doped soft magnetic alloy, the content of the Fe is 82-85 wt %, the content of the Si is 8-10 wt %, the content of the Al is 3-5 wt %, the content of the Re is 1-2 wt %, and the content of the N is 0.25-0.65 wt %. Most of the interior of the rare earth ion-doped soft magnetic alloy of the present disclosure is composed of FeSiAl crystal grains, but an appropriate amount of an easy-faced Re—Fe—N compound is dispersed among the FeSiAl crystal grains. Based on such a structure, the rare earth ion-doped soft magnetic alloy of the present disclosure has excellent electromagnetic properties and lower loss under a working condition of MHz.

Abstract: The present utility model relates to the technical field of heat exchangers, and disclosed are a tube sheet built-in type structure and a spiral-flow type wound tube heat exchanger. The heat exchanger to which the tube sheet built-in type structure is applicable is provided with a housing, and comprises: a tube sheet provided inside the housing, the tube sheet being not in direct contact with the housing. According to the present utility model, the built-in type tube sheet structure is used, the tube sheet is arranged inside the housing, and the tube sheet is not directly connected to the housing, thereby reducing the longitudinal length of the device and the circumferential outreach dimensions of connecting tubes.

Abstract: The embodiment of the present disclosure provides a cleaning device, which includes a power module, a vacuum cleaner module, and a surface wet cleaner module. The power module includes a power assembly and a motor assembly that are connected to each other. The vacuum cleaner module includes an air suction assembly, a dust collection assembly, and a filter assembly that are sequentially communicated, and the vacuum cleaner module has a first mounting position that is configured to be connected and matched with the power module. The surface wet cleaner module includes a floor brush and a body, and the body has a second mounting position that is configured to be connected and matched with the power module.

Abstract: An aspect of the disclosure is related to a cleaning composition and a device to apply a cleaning composition. The device may include a container containing a cleaning composition to clean a surface of a dental appliance in an oral cavity, an applicator portion to apply the cleaning composition to the surface of the dental appliance in the oral cavity and a gap between the dental appliance and the oral cavity, the applicator having a portion to be deformed based on the gap width of the gap to be inserted into the gap to apply the cleaning composition in the gap, and an extruder to extrude the cleaning composition in the container through an outlet to the applicator portion and the portion, wherein the cleaning composition is essentially free of a dental abrasive agent, wherein the dental abrasive agent is a solid particle having a hardness harder than the hardness of the surface of the dental appliance.

Abstract: Dental whitening compositions, kits and systems exhibiting stability in viscosity and hydrogen peroxide concentration for an extended shelf life without refrigeration or other special storage conditions are provided herein. The composition may be in gel form and comprise a hydrogen peroxide or a hydrogen peroxide precursor, and a thickening agent comprising a vinylpyrrolidone polymer or copolymer. In some aspects, a kit may be provided comprising a two-part dental whitening system, wherein one part comprises a whitening agent, and a separate part comprises a strong base.

Abstract: Dental remineralization compositions and methods are provided herein. In an aspect of the disclosure, a remineralization composition comprises a remineralizing agent and a polyanion serving as a multi-point anchor to localize the remineralizing agent on tooth surfaces. The remineralization composition can comprise a non-ionic surfactant that promotes formation of complexes between the remineralizing agent and the polyanion. In some aspects, the polyanion comprises poly(acrylic acid) sodium salt. In some aspects, the remineralizing agent comprises at least one of bioactive calcium containing compounds, bioactive calcium containing complexes, and free calcium ions formed once the bioactive calcium containing compounds contacts or mixes with water. In some aspects, the remineralization composition is free of phosphates and/or phosphate salts.

Abstract: An AK3287 formulation, and a preparation method therefor and an application thereof. In mass fraction, the formulation comprises: 0.05-20% of AK3287; 0-30% of an absorption enhancer; 5-99.95% of an oil-phase substance; 0-25% of an emulsifier; 0-5% of a preservative; and 0-70% of water, wherein the structure of AK3287 is shown in the drawing. AK3287 molecules in the formulation have high exposure in the skin, and the formulation can reduce the thickness of the skin at a scar and the ratio of the maximum thickness of the skin at the scar to the thickness of the normal skin; moreover, the relative density of TGF-? and type I collagen in the skin is reduced.

Abstract: Dental whitening compositions, kits and systems exhibiting stability in viscosity and hydrogen peroxide concentration for an extended shelf life without refrigeration or other special storage conditions are provided herein. The composition may be in gel form and comprise a hydrogen peroxide or a hydrogen peroxide precursor, and a thickening agent comprising a vinylpyrrolidone polymer or copolymer. In some aspects, a kit may be provided comprising a two-part dental whitening system, wherein one part comprises a whitening agent, and a separate part comprises a strong base.

Abstract: Disclosed is a pharmaceutical unit dosage composition including a plurality of enteric coated micro pellets. Each enteric coated micro pellet includes a core bead, an optional first sealing layer, an API layer including a Compound (I) having the following structure or a pharmaceutically acceptable salt thereof, an optional second sealing layer, and an enteric coating layer. Also disclosed is a method for the treatment and prophylaxis of RSV diseases including providing a Compound (I) and administering to a patient in need thereof a therapeutically effective amount of the Compound (I) so that t½ of the Compound (I) is about 6 to 13 hours.

Abstract: The disclosure provides a repairing material for emergency treatment of a black and odorous surface water environment and its preparation method, belonging to the fields of environmental science and engineering technology. The preparation method of the disclosure specifically includes the following steps: (1) uniformly stirring activated carbon, calcium chloride, ammonia water solution, polyethylene glycol and water in a stirrer, then dropwise adding hydrogen peroxide, and after the completion of the dropwise adding, obtaining a calcium peroxide repairing material solution; (2) adding a sodium hydroxide solution to the calcium peroxide repairing material solution obtained in step (1) until a pH reaches 11.5, thereby obtaining a suspension; (3) centrifuging the suspension in step (2) to obtain a solid; and (4) washing the solid in step (3) with distilled water until a final pH of residual water reaches 8.4, and then drying the obtained precipitate to obtain the repairing material.

Abstract: A network device may store domain name system (DNS) information in a DNS file in a first DNS store of a first control plane component included in the network device, the DNS information being associated with a plurality of DNS entries stored in a first DNS memory of the first control plane component; may transfer, based on storing the DNS information in the DNS file in the first DNS store, a copy of the DNS file from the first DNS store to a second DNS store of a second control plane component included in the network device, the copy of the DNS file including the DNS information associated with the plurality of DNS entries; and may transfer, based on detecting an event associated with the first control plane component, the DNS information from the copy of the DNS file to a second DNS memory of the second control plane component.

Abstract: A network device may store domain name system (DNS) information in a DNS file in a first DNS store of a first control plane component included in the network device, the DNS information being associated with a plurality of DNS entries stored in a first DNS memory of the first control plane component; may transfer, based on storing the DNS information in the DNS file in the first DNS store, a copy of the DNS file from the first DNS store to a second DNS store of a second control plane component included in the network device, the copy of the DNS file including the DNS information associated with the plurality of DNS entries; and may transfer, based on detecting an event associated with the first control plane component, the DNS information from the copy of the DNS file to a second DNS memory of the second control plane component.

Abstract: In some examples, the disclosure relates to a method including applying biomimetic mineralization process to an enamel defect of a tooth, wherein the applied biomimetic mineralization process remineralizes the tooth in the enamel defect. For example, applying a biomimetic mineralization process may include applying a polymer stabilized biomimetic mineralization composition in the area of the enamel defect and matrices, wherein the biomimetic mineralization composition infiltrates into a porosity of the enamel defect and crystalizes to remineralize the enamel defect. An example polymer stabilized biomimetic mineralization composition includes calcium, phosphate, and a polyanionic additive.