Abstract: The present disclosure provides a method for a safety inspection of an LNG distributed energy smart terminal, an Internet of Things (IoT) system, and a storage medium.

Abstract: In one embodiment, a polishing composition can comprise abrasive particles including zirconia, an oxidizing agent including hydroxylamine and water. The polishing composition can have a high copper removal rate of at least 3500 ?/min, and a polishing selectivity of copper to silicon dioxide(Cu:SiO2) can be at least 2.5:1. In another embodiment, a combination product can comprise a first polishing composition and a second polishing composition, wherein each of the first polishing composition and the second polishing composition can comprise abrasive particles including zirconia and an oxidizing agent including hydroxylamine, wherein a hydroxylamine weight % ratio of the first polishing composition to the second polishing composition may be at least 5:1.

Abstract: The present disclosure discloses a method for monitoring operation of liquefied natural gas (LNG) storage, comprising: acquiring operating data of an LNG storage device, physical and chemical parameters of LNG and historical pressure change data in the LNG storage device; determining pseudo data information based on the historical pressure change data; determining at least one set of pressure change data at at least one future time point through a pressure model based on the operating data, the physical and chemical parameters, the historical pressure change data, and the pseudo data information, wherein the pressure model is a machine learning model, the pressure model includes a feature extracting layer and a pressure layer; and determining a pressure adjusting time point and preparing for a pressure adjustment based on the at least one set of pressure change data at the at least one future time point.

Abstract: The present disclosure discloses a method and system for reconstructing missing information in a damaged turbulent flow field. A second mask is randomly generated based on a first mask and is utilized in the network training, which significantly enhances the generator network's ability to recognize multiple damaged regions and generalize different damage forms. A combined loss function is introduced, which not only evaluates the overall difference between a reconstructed turbulent flow field and an original turbulent flow field, but also evaluates the difference in feature mapping at different levels of a pretrained network. This dual evaluation ensures accurate reconstruction of flow field information from macro to micro scales. Such a semi-supervised learning strategy permits network training without complete turbulent flow field data.

Abstract: The purpose of the present invention is to provide a multi-dimensional coupled design method for the through-flow aerodynamic layout of a gas turbine transition section-high pressure compressor. In the present invention, the transition section and the high-pressure compressor are regarded as a system for integrated coupled design, and full integration with the upstream transition section is achieved in all dimensions and links of the high-pressure compressor's aerodynamic design. This realizes the integrated and collaborative design of the through-flow layout of the transition section and the high-pressure compressor, enabling the aerodynamic design of the transition section-high pressure compressor system in different dimensions to enter a stage of systematization, parameterization and refinement.

Abstract: The present invention discloses a multistage variable burning rate solid rocket motor and a forming method. A multi-material composite fiber skeleton structure is embedded inside a propellant in the present invention, so that the original burning rate of the propellant presents multistage changes to achieve the function of multistage thrust. The fiber skeleton structure embedded in the solid rocket motor is formed by additive manufacturing, fixed in a combustion chamber, and then charged at one time to complete the forming of a motor grain. The design can greatly increase the burning rates of the propellants of end-burning and bore-burning motors, and can also conduct multistage adjustment for the burning rates of the motors by changing the fiber skeleton and structure, so as to satisfy the requirements of missile weapon systems for multistage power propulsion. The present invention greatly simplifies the technological production process of the existing single-chamber multi-thrust motor.

Abstract: A multi-stage pressure regulating method and internet of things (IoT) system for natural gas transmission in a distributed energy pipeline are provided. The method includes: determining a base booster parameter of a target booster station; determining a characteristic booster parameter of the target booster station; generating and sending a booster command to control the target booster station to perform a booster operation on natural gas in at least one downstream pipeline branch; in response to the booster command being executed, obtaining transportation status data of natural gas in at least one pipeline branch in a preset area; in response to the transportation status data not satisfying a preset condition, determining a linkage adjustment parameter of the target booster station and an associated booster station; and generating and sending a linkage adjustment command to update the characteristic booster parameter of the target booster station and the associated booster station.

Abstract: The present disclosure provides a method and an Internet of Things (IOT) system for distributed energy pipeline natural gas transmission safety management, the method comprising: obtaining a safety management region, the safety management region is provided with one or more spot-check sites; determining, based on a preset cycle, whether a monitoring sequence of the one or more spot-check sites satisfies a first preset condition during a preset historical time period; in response to determining that a monitoring sequence of the one or more spot-check sites does not satisfy the first preset condition, maintaining a first monitoring instruction of the one or more spot-check sites; in response to determining that the monitoring sequence of the one or more spot-check sites satisfies the first preset condition, adjusting the first monitoring instruction based on the monitoring sequence and an inspection sequence in the preset historical time period, and sending a second monitoring instruction obtained after adjustm

Abstract: Provided are a method, an IoT system, and a storage medium for demand management of natural gas in distributed energy pipelines. The method includes: determining a commercial gas consumption change sequence; obtaining gas flow data; obtaining historical gas consumption data based on the gas flow data; determining a residential gas consumption change sequence; determining a demand volume sequence based on the residential gas consumption change sequence, the commercial gas consumption change sequence, and the historical gas consumption data; constructing a micro-pipeline network map based on a low-pressure transportation network, a current gas storage amount and a storage capacity of a gas field station, and the demand volume sequence; determining a gas storage coverage rate and a gas supply priority; determining a gas storage adjustment parameter based on the gas storage coverage rate and the gas supply priority; and generating a storage adjustment instruction based on the gas storage adjustment parameter.

Abstract: The present invention discloses a multistage variable burning rate solid rocket motor and a forming method. A multi-material composite fiber skeleton structure is embedded inside a propellant in the present invention, so that the original burning rate of the propellant presents multistage changes to achieve the function of multistage thrust. The fiber skeleton structure embedded in the solid rocket motor is formed by additive manufacturing, fixed in a combustion chamber, and then charged at one time to complete the forming of a motor grain. The design can greatly increase the burning rates of the propellants of end-burning and bore-burning motors, and can also conduct multistage adjustment for the burning rates of the motors by changing the fiber skeleton and structure, so as to satisfy the requirements of missile weapon systems for multistage power propulsion. The present invention greatly simplifies the technological production process of the existing single-chamber multi-thrust motor.

Abstract: An end-connecting type hydraulic loader to solve the difficult loading and assembly on the same side in closed power closed testing in planetary gearbox, includes a transmission shaft (3), an internal output inner gear sleeve (1) on a left end of the transmission shaft (3), a thrust shaft (5) rotatably mounted on the transmission shaft (3) and positioned on a right side of internal output inner gear sleeve (1), an external output inner gear sleeve (2) coaxially installed on the internal output inner gear sleeve (1) and connected to the thrust shaft (5), a spiral floating cylinder (9) on a right end of the thrust shaft (5) and a siding assembly on the transmission shaft (3) meshed with the spiral floating cylinder (9) having a left and right sliding movement along the transmission shaft (3) under a hydraulic oil circuit action of the transmission shaft.

Abstract: A polishing composition can comprise: an aluminum (III) salt, a permanganate salt, and water, wherein an amount of the permanganate salt can be at least 2.5 wt % based on a total weight of the polishing composition; an amount of the aluminum (II) salt can be at least 0.2 wt % based on the total weight of the polishing composition; and the pH of the composition is not greater than 4.5.

Abstract: The present disclosure discloses a method and an Internet of Things system for liquefied natural gas (LNG) warehousing and transportation.

Abstract: The present disclosure discloses a method for method for parameter adjustment of a liquefied natural gas (LNG) distributed terminal based on Internet of Things and a system. The method includes: based on at least one transmission node on a transmission link, obtaining terminal information of at least one set of terminals and transmission status information of the at least one transmission node; in response to the transmission status information satisfying a preset status condition, predicting a malfunction risk coefficient of the at least one set of terminals at at least one set of future time points; and based on the malfunction risk coefficient and in combination with a device parameter of the at least one set of terminals, judging whether to adjust a control parameter of the at least one set of terminals in advance.

Abstract: A high-power and heavy-load back-to-back planetary gear test bench for full speed and full loading testing, which solves transmission shaft's high processing cost problem and the inability to test in a simulated environment, includes a driving device, first and second shaft couplings, a speed increaser, a speed and torque meter, a back-to-back planetary gearbox closed power system, a clamping groove body coaxially sleeved on an axial positioning protrusion, a clamping component embedded inside an axial positioning groove, and a shaft segment coaxially installed on the clamping groove body to provide an axial displacement by the clamping component to tightly clamp the clamping groove body and the axial positioning protrusion, therefore the clamping groove body generates a radial displacement under an axial pushing of the clamping component and is expanded in the radial direction to tightly connect with the axial positioning groove; and a marine test component for marine environment simulation.

Abstract: A coupling device between a test box and a companion test box for back-to-back planetary testing to solve the problem of axial displacement and motion in the connecting structure of the existing back-to-back planetary test bench, which comprises a first output flange, a second output flange, a first transition coupling gear connected to the first output flange, a second transition coupling gear connected to the second output flange, a ring-shaped toothed flange with internal teeth coupled to the first and the second transition coupling gears, an axial limiting unit installed on the left and right sides of the toothed flange and extends towards the axis of the transmission shaft formed by two semicircular shaped grooved sleeve bodies, a radial limiting ring and screw rods, and an axial compensation groove formed on an inner sidewall of the axial limiting unit.

Abstract: The present disclosure discloses a method for liquefied natural gas (LNG) station management and an Internet of Things system. The method includes: acquiring historical gas filling data of a gas station based on a preset acquiring time; determining LNG demand data at at least one future moment and a predicted confidence level of the LNG demand data based on the historical gas filling data through a prediction model; determining a reliable moment based on the predicted confidence level; determining at least one set of candidate delivery plans based on the LNG demand data and LNG storage data; and determining a target delivery plan based on at least one piece of gas filling cost data of the at least one set of candidate delivery plans and the reliable moment.

Abstract: An end-connecting type hydraulic loader to solve the difficult loading and assembly on the same side in closed power closed testing in planetary gearbox, includes a transmission shaft (3), an internal output inner gear sleeve (1) on a left end of the transmission shaft (3), a thrust shaft (5) rotatably mounted on the transmission shaft (3) and positioned on a right side of internal output inner gear sleeve (1), an external output inner gear sleeve (2) coaxially installed on the internal output inner gear sleeve (1) and connected to the thrust shaft (5), a spiral floating cylinder (9) on a right end of the thrust shaft (5) and a siding assembly on the transmission shaft (3) meshed with the spiral floating cylinder (9) having a left and right sliding movement along the transmission shaft (3) under a hydraulic oil circuit action of the transmission shaft.

Abstract: The present invention relates to the technical field of biosynthesis, and in particular to a method for preparing S-nicotine. Amine oxidase is utilized to oxidize 1-methylpyrrolidine into corresponding imine, and then the imine and nicotinic acid are condensed and decarboxylated under the catalysis of nicotine synthetase to obtain a final product S-nicotine. The S-nicotine having specific chirality can be obtained by means of two-step reaction in a reaction system, the synthetic route is short, the yield is high, the reaction conditions are mild, and large-scale production is easy to achieve; moreover, raw materials are wide in source, low in price, low in production cost and environmentally friendly, the production cost of nicotine is remarkably reduced, and the requirements of current green industrial production can be better satisfied.

Abstract: In one embodiment, a polishing composition can comprise abrasive particles including zirconia, an oxidizing agent including hydroxylamine and a triazole compound, the triazole compound being selected from 1,2,4-triazole, or 1,2,3-triazole, or a combination thereof. The polishing composition can have an even a polishing selectivity of copper (Cu) to tantalum nitride (TaN) to silicon dioxide (SiO2) of 1:1:1, with a with a selectivity variation not greater than ±50%.