Abstract: A composite additive for forming inclusions with a core-shell structure, a preparation method and a smelting method are provided. The composite additive includes the following chemical components by mass percentage: Fe: 41-59%, Zr: 5-11%, Ti: 14-26%, Mg: 11-19%, and RE: 4-10%, in which the mass percentage content of Zr element, Ti element, Mg element and RE element satisfies a formula: (Ti+Mg+RE)/Zr=4-8. The composite additive for forming inclusions with a core-shell structure has the characteristics of fineness, spheroidization and obvious dispersion effect. This type of inclusions has a bulk modulus similar to that of the iron matrix, which can significantly improve the plasticity, toughness, fatigue resistance, local corrosion resistance, welding performance, cold bending performance, etc. of steel materials, suitable for steel types with strict requirements on the shape of inclusions, such as marine steel, pipeline steel, container steel, cold heading steel, tool and die steel, etc.

Abstract: A seawater corrosion-resistant marine engineering steel and a preparation method thereof are provided. The seawater corrosion-resistant marine engineering steel consists of the following chemical compositions in percentage by mass: C: 0.011-0.069%, Si: 0.11-0.29%, Cr: 1.51-1.99%, Nb: 0.02-0.05%, Zr: 0.01-0.02%, RE: 0.0034-0.02%, and the balance of Fe and inevitable impurities. The mass percentages of Zr element and RE element also satisfy the following formulas: 0.01%<Zr+RE<0.02%, and Zr/RE=1-3. The marine engineering steel is designed with cheap chemical compositions of low carbon, low silicon and medium chromium, and is completely free of valuable corrosion-resistant metal elements such as Ni and Cu. Instead of the traditional Al deoxidization technology, Si deoxidization assisted by Zr?RE composite deoxidization is used to form a fine, dispersed and uniform composite oxysulfide.

Abstract: Recombinant protein of GPER is provided. The recombinant protein has the biological activity of G protein-coupled estrogen receptor.

Abstract: A high-strength steel with excellent neutral aqueous medium corrosion resistance, and a preparation method and application thereof are provided. A steel plate is designed with cheap chemical compositions of low carbon, low silicon and medium manganese, and is completely free of precious metal elements such as Cr, Ni and Cu, thereby greatly reducing the material cost. According to the present invention, instead of the traditional Al deoxidation technology, Si or Si—Mn deoxidation assisted by Zr—Ti composite deoxidation is used to form a fine, dispersed and uniform composite oxysulfide, which greatly decreases the density of corrosion-active inclusions, and obviously improves the neutral aqueous medium corrosion resistance. Through the design of low carbon equivalent, the steel plate has excellent welding performance; and the composite microalloying of Nb, Zr and Ti is adopted to cooperate with the TMCP rolling parameter control, so that the steel plate has high strength and good extensibility.

Abstract: The present disclosure selects a node generating a periodic time slot request in a network to construct a set of periodic time slot request generation nodes, and constructs a time slot request cycle set; selects a node generating an aperiodic time slot request in the network to construct a set of aperiodic time slot request generation nodes, and constructs a time set of the aperiodic time slot request generation nodes; calculates a time slot contention scheduling parameter of each node in the set of the periodic time slot request generation nodes; and if no aperiodic time slot request arrives, allocates a time slot to each time slot requesting node during periodic time slot scheduling; or if an aperiodic time slot request, namely, a sporadic time slot request, arrives, performs rescheduling through hybrid time slot scheduling based on arrival time of the aperiodic time slot request.

Abstract: A manufacturing method for ceramics with complex structure by laser 3D printing, includes acquiring a three-dimensional model of a complex component to be fabricated, and devising a laser scanning path; placing a substrate in a gas-phase reactor chamber, followed by vacuuming and aerating vapor mixture of gas-phase precursors and carrier gas into the gas-phase reactor chamber; preheating the substrate to a specified temperature, turning on a laser and a thermal imager, the thermal imager controlling laser power in real time by generating a two-dimensional temperature map of a laser spot to realize temperature control a the printing process; setting a distance between the flat-field focusing lens and the substrate and a laser scanning speed; after stacking another one of the ceramic sheets repeatedly, until completing a fabrication of a ceramic complex component.

Abstract: The present disclosure provides a method, apparatus, medium and device for extracting a river drying-up region and frequency, and belongs to the technical field of remote sensing. The method for extracting a river drying-up region and frequency can be applied to efficiently acquiring river drying-up information for a long time within the large spatial region. With the inverse normalized difference water index (iNDWI) and the maximum value composite (MVC) method for the remote sensing images, the present disclosure omits the troublesome step of separately extracting a river range for each image in the conventional method. In addition, the present disclosure quickly obtains the drying-up frequency by counting the total number of available images and the number of non-water images at the same pixel position, and yields a greater efficiency for extracting the river drying-up region and frequency.

Abstract: The present invention provides a morphing cross-medium unmanned craft, wherein the cross-medium unmanned craft includes a main hull, side hulls set on both sides of the main hull and a propeller; the side hulls can be flipped relative to the main hull, so that the side hulls can have different orientation attitudes relative to the main hull, which can make the unmanned craft be variant, realizing the cross-medium navigation function of high-speed flight in the air, energy-saving navigation on the surface of the water; the propeller is used to provide an appropriate power propulsion mode for the unmanned craft when the unmanned craft is in different motion states, so as to improve the matching and reliability of the power propulsion of the unmanned craft in different medium domains of water surface, underwater and air.

Abstract: An inversion method of river course depth based on a mathematical model and remote sensing of water depth-water surface area includes the following steps: constructing the first mathematical model; calculating the relation function between the water flowing cross-section area, the triangle area at two sides and the water depth as well as the flow path, and substituting the relation functions into the first mathematical model to obtain the second mathematical model; transforming the second mathematical model into the mathematical model of water level-water surface area; solving the unknowns in the mathematical model, and substituting the unknowns into the second mathematical model to obtain the third mathematical model; and substituting the water surface area extracted by the remote sensing into the third mathematical model to obtain the water depth of the river course.

Abstract: Disclosed is a ship image track tracking and prediction method based on ship heading recognition, which includes the following steps: obtaining a ship image data set, preprocessing the data set to obtain a preprocessed data set; inputting the preprocessed data set into the rotating ship detection network for training, obtaining the trained rotating ship detection network, collecting the ship navigation video, and inputting the ship navigation video into the trained rotating ship detection network to obtain the ship detection result; inputting the ship detection result into the rotating ship tracking network and tracking the target ship to obtain the historical trajectory and the heading information of the target ship; inputting the historical trajectory and ship heading information of the target ship into the ship trajectory and ship heading prediction network, and predicting the navigation trajectory and ship heading at sea.

Abstract: Provided herein is a laser processing system integrated with an MBE device, including an MBE growth chamber, a sample table, an optical path mechanism, a heat insulation mechanism, and a cooling mechanism. An opening is formed in a side of the MBE growth chamber. The sample table is fixed in the MBE growth chamber, corresponds to a position of the opening, and is used for placing a substrate sample material. The optical path mechanism is relatively arranged on a side of the MBE growth chamber, and the optical path mechanism is provided with a light-emitting end. A side of the light-emitting end penetrates through the opening of the MBE growth chamber, extends into the MBE growth chamber, and is spaced apart from the sample table. The optical path mechanism is sealedly connected to the opening of the MBE growth chamber.

Abstract: The present invention belongs to animal experiments field, disclosed a single factor modeling-constraint method and device for mice chronic fatigue syndrome, the modeling-constraint method is specifically using mineral water bottle to restraint mice; the mineral water bottle is divided into upper, middle and lower parts; the body of mineral water bottle is uniformly drilled for mice to breathe; the inner of the mineral water bottle is blocked by a cardboard to reduce the move space of mice; cover the mice through the divided bottle; one end of the opening is tightly attach to the wall, the other end is tightly attach to the mice feeding box, and keeping 30 minutes to restraint. The present invention utilizes mineral water bottle to make three simple restraint tube, not only saves the costs of experiment, but also turns waste into treasure, which is a simple operation, and increases the possibility of the experiment.

Abstract: Disclosed is a method, device, and system for testing the static contact angle of reagent asphalt, the method includes the following steps: acquiring a side image of a stable droplet formed by a test reagent on asphalt surface, and determining the position of a baseline in the side image; cropping the side image to obtain a droplet image, and extracting droplet contour points in the droplet image; screening out effective contour points corresponding to contours of the two sides of the droplet from the droplet contour points; performing cubic polynomial fitting on the effective contour points to obtain curve function of contour curves on both sides; calculating contact angle value from the curve function and the position of the baseline. The beneficial effects of this disclosure are: this disclosure reduces the difficulty of fitting of the droplet contour and thus improves the calculation precision of the contact angle.

Abstract: The present invention provides a method for synergistically vitrifying medium and low-level radioactive glass fibers and combustible solid nuclear waste incineration ashes. According to the chemical composition characteristics of incineration ashes of combustible solid wastes such as glass fibers, cotton, plastic, rubber and absorbent paper produced during the operation of nuclear facilities, the present invention takes the glass fibers as a glass matrix of combustible waste incineration ashes and minimizes the addition of an additive by a combination in different proportions through a synergistic treatment method. A vitrified form provided by the present invention meets the requirements of uniformity, density, impact resistance, chemical durability and the like of radioactive waste vitrified forms.

Abstract: Disclosed is path planning system and method for sea-aerial cooperative underwater target tracking, the method comprises: obtaining the position information of a detection target, carrying out a first path planning along a channel of sea surface monitoring device according to the position information of the detection target; carrying out a second path planning along the channel of sea surface monitoring device according to the water surface navigation map and its own position information, constructing an underwater obstacle map; performing a third path planning according to the underwater obstacle map, and tracking to the position of the detection target to complete the tracking task. This disclosure adopts the collaborative optimization of several clusters to reduce the number of iterations and improve the optimization efficiency, making the path planning reasonable, as a result, the target position can be quickly tracked, and the autonomous collaborative tracking capability is improved.

Abstract: Disclosed is a method, system, and electronic device for precision roll bending of cylinder with variable curvature section. The method first obtains process parameters of roll bending of a target cylinder, and then conducts roll bending rebound simulation of the cylinder based on the process parameters to determine influence factors of rebound compensation error. Then, multiple sets of different preset influence factor values are set to perform roll bending rebound simulation of different arc segments. This disclosure uses multiple simulations of the rebound caused by cylinder roll bending to determine the factors that affect the rebound compensation error and the magnitude of the rebound compensation error that may be caused by these factors. Finally, an expression for the rebound compensation error is obtained to correct the rebound compensation equation, eliminating the error caused by rebound compensation, and ensuring that the cylinder forming meets the expected accuracy requirements.

Abstract: A wear monitoring method of a polymer thrust bearing based on an ultrasonic reflection coefficient amplitude spectrum (URCAS), includes: selecting a corresponding delay block probe based on a material of a to-be-tested bearing, and setting corresponding parameters of a pulse generator; after collecting a primary echo from a surface of the delay block probe as a reference signal, placing the delay block probe in a designated region on a back of the to-be-tested bearing, and collecting time-domain echo signals from upper and lower surfaces of the bearing; establishing a propagation model of an ultrasonic signal in a polymer bearing, and calculating a theoretical URCAS based on the propagation model; calculating a measured URCAS; and constructing an objective function, and solving the objective function by using a differential evolution algorithm. A plurality of parameters of the polymer bearing is solved to meet a requirement for wear monitoring by adopting the method.

Abstract: An automatic precision calculation method of a pose of a rotational linear array scanning image includes: obtaining a collection parameter of the rotational linear array scanning image and a camera intrinsic parameter; based on the above parameters, projecting the rotational linear array scanning image to its tangent plane by orthographic projection transformation to generate an equivalent frame image having the approximately same intrinsic and extrinsic parameters as the rotational linear array scanning image and calculate a coordinate of each pixel of the equivalent frame image projected onto the rotational linear array scanning image based on an inverse projection transformation calculation method; by using structure-from-motion method, automatically calculating a pose parameter of the equivalent frame image and a corresponding waypoint three-dimensional coordinate; with the pose parameter of the equivalent frame image as an initial value, obtaining an accurate imaging parameter of the rotational linear ar

Abstract: A method for retrieving heights of densely-covered forest canopies near power transmission lines includes: acquiring ICESat-2 LiDAR data, JL-1 image data, auxiliary data and three-dimensional information data about the power transmission lines within a target area; carrying out image preprocessing on a JL-1 image to generate a first image; screening the ICESat-2 LiDAR data according to a screening rule to obtain high-quality laser tree height data; by employing the first image, the high-quality laser tree height data and the auxiliary data, training a neural network model for retrieving a forest tree height according to an optical image and the auxiliary data; by employing the neural network model, generating a height distribution map of densely-covered trees in the target area; and calculating a height difference between a tree and a power transmission line nearest the tree to generate a hidden danger troubleshooting theme map.

Abstract: The invention discloses a method and system for detecting and repairing sun glint in UAV optical RGB ocean image, introduces a sun glint attention module, and constructs a semantic segmentation network model based on attention mechanism. The sun glint region is segmtioned by semantic segmentation network model based on attention mechanism, and the optical flow field of high-resolution UAV optical RGB ocean image is extracted by RAFT optical flow estimation network. sun glint region and optical flow field are used for optical flow propagation to repair the sun glint in UAV optical RGB ocean images and restore the real benthic image features.