Abstract: A frequency locking method for a phase-locked loop comprises the following steps: S1, a frequency control module controls a numerically controlled oscillator to obtain an maximum output frequency and a minimum output frequency; S2, obtain a minimum frequency ratio and a maximum frequency ratio by means of a time-to-digital converter and the frequency control module; S3, calculate a first frequency control word and a first frequency ratio according to the minimum frequency ratio and the maximum frequency ratio; S4, the frequency control module uses the Newton's iterative method to recalculate a new frequency control word; S5, obtain a new frequency ratio according to the new frequency control word; S6, if the new frequency ratio is within an error range, end iteration and stably output the new frequency control word, and otherwise, jump to step S4.

Abstract: The present invention discloses a welding method of a demetallized ceramic substrate having a surface capillary microgroove structure. The demetallized ceramic substrate includes a ceramic substrate main body and surface capillary microstructures. The surface capillary microstructures are arranged on two lateral sides of the ceramic substrate main body and the surface capillary microstructures specifically are capillary microgrooves. The welding method includes the following steps: fixing a chip to an upper surface of the demetallized ceramic substrate having the surface capillary microgroove structure, fixing the ceramic substrate with the chip to a printed circuit board having a bonding pad, and placing melted solder on the bonding pad, and driving the solder to ascend to an electrode of the chip from the bonding pad in a lower layer by means of a capillary force, thereby realizing an electrical connection between the chip and the printed circuit board.

Abstract: Disclosed are a layered magnesium manganese composite material for copper ion adsorption, a preparation method therefor and an application thereof. The preparation method comprises: (1) dissolving a soluble magnesium salt and a soluble manganese salt in water to obtain a compound solution of the magnesium salt and the manganese salt; (2) dissolving a soluble carbonate and a soluble hydroxide in water to obtain a compound solution of the carbonate and the hydroxide; (3) dropwise adding the compound solution of the magnesium salt and the manganese salt into the compound solution obtained in step (2), stirring a mixed solution and allowing the mixed solution to age, and subjecting an obtained precipitate to centrifugation, washing, drying, grinding and sieving to obtain the layered magnesium manganese composite material for copper ion adsorption.

Abstract: A conical self-positioning limit feeding device and method. The conical self-positioning limit feeding device has bearing pot, empty circle in the center of bearing pot, U-shaped slide way formed between outer circle and inner circle, rotating evacuation cone and limit feeding rod arranged in the bearing pot and rotate in the same direction, and the speed of the rotating evacuation cone is greater than that of the limit feeding rod; materials are placed in the bearing pot, the evacuation cone rotates, and the materials rotate in the U-shaped slide way of the bearing pot by the torque generated by the friction between rotating evacuation cone and materials, till the long axes of the materials are tangent to the radius of the rotating evacuation cone; the limit feeding rod rotates and pushes materials to exit at equal intervals, thereby achieving the arrangement of the materials in the direction of long axis.

Abstract: Disclosed is a controller capable of changing volume. The controller according to the present invention includes a housing; a volume changing unit installed outside the housing and having one end and the other end movable with respect to the housing, respectively; a driving unit for moving at least one of one end and the other end of the volume changing unit; and a control unit for controlling the driving unit. According to the present invention, it is possible to improve a user's feeling of use and to enhance satisfaction and fun by variously changing the volume, shape, etc. of a controller.

Abstract: Disclosed are a self-righting unmanned ship suitable for adverse sea conditions and a self-righting working mode thereof, belonging to the field of unmanned ship equipment and techniques. The unmanned ship comprises a main hull, a self-righting deck, an equipment and pipeline mast, a propeller, a radar, an air inlet and exhaust system, and a main engine system. Through the design of a watertight deck, the hull of the unmanned ship has a self-righting function, avoiding the possibility of the unmanned ship itself turning over, without installing additional self-righting equipment. Meanwhile, the internal structure and the self-righting working mode of the unmanned ship make it possible for the hull to automatically turn off the main engine and the air inlet and exhaust system when the heeling angle of the hull exceeds a certain angle, making the whole ship watertight.

Abstract: The present invention relates to a device for recovering, separating and purifying oil mist in a minimum quantity lubricant (MQL) grinding process, comprising: an air separating mechanism, which comprises a pipeline and a fan fixedly connected with one end of the pipeline, wherein the fan is used for forming negative pressure in the pipeline, at least one conical filter mesh mechanism is arranged in the pipeline, and a tip of the conical filter mesh mechanism faces one side of an air inlet direction of the pipeline; and a filtering and recovering mechanism, which is connected with the pipeline and comprises a tank body, a filtering mechanism and a recovering mechanism, wherein the tank body is connected with the pipeline by a connecting part, and the filtering mechanism is connected with the recovering mechanism.

Abstract: The present invention disclosed a multi-objective operation control method for a micro energy grid, comprising the specific steps of: (1) establishing optimization objectives of the micro energy grid, the optimization objectives comprising comprehensive income maximization and comprehensive energy utilization rate maximization; (2) using GAMS software to solve for an optimal solution and a worst solution for each optimization objective; (3) processing the optimization objectives by means of a weighting method, uniformly changing a weighting coefficient, and acquiring a Pareto frontier by the GAMS software; (4) acquiring reference satisfaction levels of Pareto optimal solutions according to a fuzzy membership degree, and selecting the Pareto optimal solution having the maximum reference satisfaction level as an optimal compromise solution; and (5) executing scheduling of the micro energy grid according to the optimal compromise solution.

Abstract: The invention relates to the field of software management and is intended to invent a blockchain-based software version data management system and an establishing method thereof. The system mainly comprises a data acquisition module, a data transmission module and a data consensus module, wherein the data acquisition module involves data generation, data splicing, and data encapsulation, and provides functions such as acquisition of software version data and structural processing function; the data transmission module involves data communication, data parsing and data forwarding and provides a transmission function for the software version data; the data consensus module involves block synchronization, data verification and consensus mechanism and provides reliability test for the software version data, system new block generation and node data synchronization.

Abstract: The present invention discloses an EOG-based method and apparatus for asynchronous character input, said method comprising the following steps: displaying a virtual keyboard having a total of N keys on a display, the virtual keyboard flickering in rounds, wherein in each round, all N keys randomly flicker once; when spelling, a user blinks after the flickering of a target key, so as to acquire electro-oculogram signals of the user in real-time; capturing electro-oculogram data within a time period following the flickering of a key from the acquired electro-oculogram signals, and using said electro-oculogram data as an original feature vector of the flickering key; N original feature vectors being generated in each cycle, an electro-oculogram identification method is called to identify the N original feature vectors, and outputting a certain result from 0 to N, wherein 0 indicates that a condition for character input is not met, and 1 to N correspond to the N keys on the virtual keyboard.

Abstract: A system for robot teaching based on RGB-D images and a teach pendant, including an RGB-D camera, a host computer, a posture teach pendant, and an AR teaching system which includes an AR registration card, an AR module, a virtual robot model, a path planning unit and a posture teaching unit. The RGB-D camera collects RGB images and depth images of a physical working environment in real time. In the path planning unit, path points of a robot end effector are selected, and a 3D coordinates of the path points in the basic coordinate system of the virtual robot model are calculated; the posture teaching unit records the received posture data as the postures of a path point where the virtual robot model is located, so that the virtual robot model is driven to move according to the postures and positions of the path points, thereby completing the robot teaching.

Abstract: The present disclosure belongs to the field of chemical industry production, and particularly relates to CD-MOFs and a preparation method thereof. The preparation method comprises the following steps: (1) formulating a supersaturated ?-cyclodextrin alkaline alcohol aqueous solution containing an alkali metal ion; (2) heating to obtain a hot ?-cyclodextrin solution; and (3) cooling the hot ?-cyclodextrin solution of the step (2), and performing crystallization and separation to obtain the cyclodextrin-based metal organic framework material. The CD-MOFs has perfect crystallization and large specific surface area, which are similar with those of a material prepared by means of traditional methods. The important thing is that the synthesis operation thereof is simple, green, and environmentally friendly, and the time required is shortened from a few hours or even tens of hours to a few minutes, which significantly improves the synthesis efficiency and is conductive to industrial scale production.

Abstract: The present disclosure provides a manufacturing method of a titanium dioxide solution and a titanium dioxide film. The manufacturing method of the titanium dioxide solution includes: mixing choline chloride, urea, boric acid, and titanium tetrachloride to form a first solution, wherein a molar concentration ratio of choline chloride to urea is 1:2, a molar concentration of titanium tetrachloride is 0.2 M to 0.4 M, and weight/volume of boric acid is 5 g/300 ml to 15 g/300 ml; and heating the first solution to form a second solution, wherein the second solution contains carbon/nitrogen doped titanium dioxide. In the manufacturing method of the present disclosure, the deep eutectic solution formed by choline chloride and urea may be used as a solvent, and may also be used as a carbon source and/or a nitrogen source. Therefore, titanium dioxide may be doped with carbon and/or nitrogen during the formation process.

Abstract: The present disclosure relates to a radar ranging system based on a true random generator and a ranging method thereof. The present disclosure adopts the following technical scheme: the system comprises a radar signal modulation and transmission unit and a radar signal receiving and processing unit, wherein the radar signal modulation and transmission unit inputs and stores a true random binary sequence generated by the true random generator in a memory, and cyclically outputs the true random binary sequence to a BPSK modulator for phase modulation. The receiving and amplifying unit receives the reflected radar signal. The down-sampling unit down samples the intermediate frequency signal generated by the mixers. The data processing unit converts the sampled analog signal into a digital signal and cross-correlates the signal with the true random binary sequence in the memory, so as to obtain the distance to the object side to be measured.

Abstract: Disclosed by the present invention is a target pipeline dynamic thermal failure analysis method in a parallel pipeline jet fire scenario, including the following steps: 1, inputting operation parameters of source pipeline to obtain instantaneous thermal radiation value received by target pipeline in instantaneous jet fire near field; 2, establishing fitting function relational expression of the instantaneous thermal radiation value and time change; 3, calculating instantaneous temperature distribution result of the pipe wall of the target pipeline; 4, calculating convective heat transfer coefficient of inner wall of the target pipeline; 5, calculating instantaneous thermal stress and total instantaneous stress borne by the pipe wall of the target pipeline in a circumferential direction, radial direction and axial direction; 6, carrying out testing to obtain yield strength and ultimate tensile strength corresponding to different temperatures; and 7, analyzing and judging target pipeline dynamic failure result.

Abstract: The disclosure relates to thermoelectric materials prepared by self-propagating high temperature synthesis (SHS) process combining with Plasma activated sintering and methods for preparing thereof. More specifically, the present disclosure relates to the new criterion for combustion synthesis and the method for preparing the thermoelectric materials which meet the new criterion.

Abstract: A device for supplying ammonia with solid adblue includes a urea tank, a gasholder, a heating apparatus, a mixing mechanism, a one-way valve, a first temperature sensor, a second temperature sensor, a first baroceptor, a controller. The mixing mechanism includes a first pipe, second pipe a third pipe, and media. The device is easy to has the same temperature everywhere, and then the heat distribution of the urea tank can be evenly. Thus the effectiveness about the heating apparatus is elevated.

Abstract: A vehicle capable of taking off and landing vertically and operating in water, land, air and submarine environments includes a fuselage, two main wings, ailerons, a vertical tail, a rudder, a horizontal tail, elevators, a propeller, rotor wings, rotor wing supports, etc. The vehicle has the advantages of adaptability to various environments, good concealment and strong survivability. Compared with a traditional unmanned rotorcraft, the vehicle has longer endurance time and larger load. Compared with a fixed wing UAV, the vertical take-off and landing function makes the work more convenient. Compared with unmanned diving equipment, the vehicle is applicable to richer environments, and can complete designated missions in air, land, water and submarine environments. Compared with a tilt rotor UAV in water, land, air and submarine environments, the vehicle is rapider in switching of various modes and is higher in stability.

Abstract: The present disclosure provides a multimodal fine-grained mixing method and system, a device, and a storage medium. The method includes: extracting data features from multimodal graphic and textual data, and obtaining each composition of the data features, the data features including a visual regional feature and a text word feature; performing fine-grained classification on modal information of each composition of the data features, to obtain classification results; and performing inter-modal and intra-modal information fusion on each composition according to the classification results, to obtain a fusion feature. The method enables a multimodal model to utilize a complementary characteristic of the multimodal data, with no influence by irrelevant information.

Abstract: A method for optically detecting mutations in a sequence of DNA is disclosed. The method includes generating an optically coded input sequence by optically coding an input sequence, generating an optically coded reference sequence by optically coding a reference sequence, generating an aligned sequence by overlapping the optically coded input sequence with the optically coded reference sequence, and determining a mutation in the input sequence with respect to the reference sequence. The input sequence includes an input arrangement of a plurality of elements. Each of the plurality of elements includes an element value of a plurality of element values. The reference sequence includes a reference arrangement of the plurality of elements. Each element of the aligned sequence includes one of a low-value element or a high-value element. The mutation is determined responsive to detecting the low-value element in the aligned sequence.