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 signal control method suitable for a touch screen is provided. The signal control method comprises: switching a plurality of scan lines to an enabling voltage level sequentially in a display stage; turning on a plurality of switches sequentially to transmit a plurality of display data to a plurality of data lines when a first scan line of the plurality of scan lines is in an enabled voltage level, wherein a first switch of the plurality of switches is coupled to a first data line of the plurality of data lines, and the first data line corresponds to one of a plurality of dummy lines in a vertical direction, when the first scan line is in the enabled voltage level, the first switch is turned on after other switches are turned on; and setting the plurality of dummy lines to a touch voltage in a touch stage.

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: 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: 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: 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%.

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

Abstract: A power device includes a mainboard and a power conversion module. The mainboard includes a first side and a third side opposite each other along a first direction, a second side and a fourth side opposite each other along a second direction, the first direction is perpendicular to the second direction. The power conversion module includes a primary-side circuit board and a secondary-side module. The secondary-side module includes a secondary-side circuit board, and the primary-side circuit board, the mainboard and the secondary-side circuit board being electrically connected, the primary-side circuit board and the secondary-side circuit board are spatially separated. The secondary-side module further includes secondary-side element and a first magnetic core element, wherein the secondary-side element and the first magnetic core element are disposed on the secondary-side circuit board along a third direction perpendicular to the first direction and the second direction.

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

Abstract: Various methods and systems are provided for stationary computed tomography (CT) imaging. In one embodiment, a stationary CT system includes one or more detector arrays extending around at least a portion of an imaging volume, a stationary distributed x-ray source unit comprising a plurality of emitters including a first set of emitters configured to operate at a first voltage and a second set of emitters configured to operate at a second voltage, different than the first voltage, and a source controller for triggering the first set of emitters for acquiring first projection data by the one or more detector arrays and triggering the second set of emitters for acquiring second projection data by the one or more detector arrays, the first projection data and the second projection data usable to reconstruct one or more basis material composition images or monochromatic images of an object within the imaging volume.

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: A method is provided. The method includes: reading video information of a 3D video to be rendered; determining an image format of the 3D video according to the video information; generating a first spherical model and a second spherical model according to the image format; reading a frame image of the 3D video, where the frame image includes a first sub-image and a second sub-image; obtaining angle-of-view rotation data and image sealing data; rendering the frame image according to the angle-of-view rotation data and the image scaling data, where the first sub-image is rendered to the first spherical model to obtain a first spherical image, and the second sub-image is rendered to the second spherical model to obtain a second spherical image; and outputting images in a viewport area of the first spherical image and the second spherical image to a display device.

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: 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.