Abstract: A method for constructing a general probability model of a harmonic emission level for an industrial load is provided. The method establishes, based on harmonic data monitored by a power quality monitoring system, a general probability model by combining a parametric estimation method based on a normal distribution function and a lognormal distribution function with a nonparametric estimation method represented by a kernel density estimation method, taking a degree of approximation between the general probability model and an actual probability distribution of each harmonic current as an objective function based on parameters required by the general probability model, and optimizing and solving the parameters of the proposed general probability model by using a multiplier method to determine parameters of the general probability model to finally obtain a general probability model applicable to different industrial loads.

Abstract: A method for generating a human-computer interactive abstract image includes: S1: obtaining and preprocessing the original abstract images used as a training dataset B to obtain edge shape feature maps used as a training dataset A; S2: using the training dataset A and the training dataset B as cycle generative objects of a Cycle-GAN model, and training the Cycle-GAN model to capture a mapping relationship between the edge shape feature maps and the original abstract images; S3: obtaining a line shape image drawn by a user; and S4: according to the mapping relationship, intercepting a generative part in the Cycle-GAN model that the dataset B is generated from the dataset A, discarding a cycle generative part and a discrimination part in the Cycle-GAN model, and generating a complete abstract image based on the line shape image to generate the human-computer interactive abstract image.

Abstract: A method for positioning key features of a lens based on ocular B-mode ultrasound images includes: acquiring and preprocessing the ocular B-mode ultrasound images to obtain a preprocessed B-mode ultrasound image, eyeball coordinates and lens coordinates; sending the preprocessed B-mode ultrasound image, the eyeball coordinates and the lens coordinates into a trained target detection network YOLOv3 to obtain eyeball position images and lens position images; substituting the eyeball position images and the lens position images into a trained feature extraction network group to obtain image features and feature coordinates corresponding to the eyeball position images and the lens position images, respectively; substituting the image features into a trained collaborative learning network to screen key image features; and marking a feature coordinate corresponding to the key image features on the ocular B-mode ultrasound images to complete positioning the key features of the lens.

Abstract: A preset three-stage adjustable downhole choke with choking and pressure measurement functions includes an intake assembly for natural gas filtration, an electrically-controlled telescopic assembly for positioning and clamping the downhole choke with a prefabricated seating nipple, and a three-stage choking assembly for natural gas choking and depressurization. The intake assembly, the electrically-controlled telescopic assembly, and the three-stage choking assembly are sequentially communicated from bottom to top. A first-stage control choke, a second-stage adjustable control choke, and a third-stage control choke are sequentially provided in a gas passage of the three-stage choking assembly from bottom to top. The preset three-stage adjustable downhole choke features convenient installation and removal, three-stage choking and depressurization, and an adjustable orifice diameter of a control choke, and can achieve different choking and depressurization effects.

Abstract: An integrated device and method for treating toxic and refractory wastewater are provided. The integrated device includes an adjusting pool, a first-stage reactor, a second-stage reactor, a third-stage reactor, a coagulation sedimentation pool, and a biochemical reaction pool that are sequentially connected in series, and further includes an aeration blower. Each of the first-stage reactor and the third-stage reactor is an advanced oxidation reactor, and the second-stage reactor is a Fenton reactor. The coagulation sedimentation pool includes 2 to 4 stages, and each stage of the coagulation sedimentation pool includes a coagulation tank, a primary sedimentation tank, and a secondary sedimentation tank that are connected in series. The biochemical reaction pool includes an anoxic tank, an aerobic tank, a settling tank, and a clean water tank that are connected in series.

Abstract: A copolyester, comprising structural units represented by [I], [II], [III] and [IV]. The number of structural units represented by [III] is 1-99% of the number of structural units represented by [I], and the number of structural units represented by [IV] is 0-99% of the number of structural units represented by [I]. Also provided are a preparation method therefor and an application thereof. Because an introduced high-temperature self-crosslinking group and an ion group can improve the melt viscosity and the melt intensity during burning of a copolyester, and effectively enhance the char-forming capability of the copolyester, the copolyester exhibits excellent flame retardance and anti-dripping performance. The preparation process for the copolyester is mature, convenient to operate, and easy to control and apply to industrial production.

Abstract: The invention discloses a method to support the trajectory planning considering both the flight trajectory and the visual images (VI) from air traffic control (ATC) system for air traffic controllers (ATCOs) (VI from ATC system for ATCOs), comprising the following steps: Step 1: acquire the VI and the flight trajectory to serve as the method inputs, and extract features of the VI and the relative position of the aircraft; Step 2: construct reinforcement learning-based methods to support the decision-making for flight path planning and conduct the training procedures of the models in the proposed method; Step 3: based on the optimized reinforcement learning-based methods, predict the required operation sequence to guide the flight to the target waypoint. The method of the invention can support the flight path planning for air traffic operation in a safe and efficient manner and is able to reduce the workload of air traffic controllers.

Abstract: The present disclosure provides a method for measuring a blade cross-section profile based on a line structured-light sensor at a high precision, including: (10) pose calibration on a line structured-light sensor; (20) calibration on a rotation axis: calibrating the rotation axis with a lateral datum plane of a blade; and (30) cross-section profile measurement on a target measured blade: establishing a global coordinate system, and converting blade cross-section curve feature data acquired by a data coordinate system to the coordinate system for splicing, thereby measuring a blade cross-section profile. The present disclosure reduces the error arising from transfer of calibration objects, reduces the rotation error because it does not involve the rotation angle of the turntable when calibrating the rotation axis and the rotation center, and reduces the translational error of the line structured-light sensor as positions for rotating the line structured-light sensor in two times are unchanged.

Abstract: A polymer-based spherical powder preparation device and preparation process are disclosed. The preparation device comprises a mill milling system and an inductively coupled plasma powder spheroidization system. The mill milling system of the preparation device can achieve ultra-fine grinding of the material at room temperature by applying strong extrusion, shear and circumferential stress to the material; and the inductively coupled plasma powder spheroidization system using high temperature plasma as high temperature heat source, the polymer powder can be heated uniformly, and the melting and cooling rate is fast, so the spheroidization can be completed in a short time. The preparation process of polymer based spherical powder was integrated and continuously produced by the preparation device.

Abstract: A functionally gradient material for guided periodontal hard and soft tissue regeneration includes a 3D printed scaffold layer and an electrospun fibrous membrane layer. The content of hydroxyapatite in the 3D printed scaffold layer is higher than the content of hydroxyapatite in the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is larger than the pore size of the electrospun fibrous membrane layer. The pore size of the 3D printed scaffold layer is 100-1000 ?m, and the fiber diameter of the electrospun fibrous membrane layer is 300-5000 nm. The electrospun fibrous membrane layer is in a random distribution or an oriented arrangement or has a mesh structure. The thickness of the electrospun fibrous membrane layer is 0.08-1 mm.

Abstract: A compound is shown in formula I and can be in the form of a pharmaceutically acceptable salt, or a stereoisomer, or a solvate, or a prodrug, or a metabolite. The compound takes effect rapidly and has a long-time local anesthetic effect following a single dose, with the sensory nerve blocking time being greater than the motor nerve blocking time, has both a long-acting local anesthetic effect and a selective local anesthetic effect, significantly reduces side effects of the compositions QX314 and QX314 and a quaternary ammonium salt compound with surfactant structural characteristics, and is safer. The compound of formula I of the present invention and a pharmaceutically acceptable salt thereof can be used for preparing drugs that have a long-time local anesthetic effect and a selective local anesthetic effect.

Abstract: A method for preparing a novel waterborne polyurethane foam layer for synthetic leather is disclosed. The method includes first preparing a charged cellulose nanofiber by using a wood pulp as a raw material; meanwhile, subjecting a polyisocyanate, a macromolecular diol, a hydrophilic chain extender and a small molecular chain extender to a polyaddition reaction and an acid-base neutralization reaction in sequence, to obtain a cationic or anionic waterborne polyurethane; adding the charged cellulose nanofiber and a certain amount of a crosslinking agent to the oppositely charged ionic waterborne polyurethane emulsion, stirring the resulting mixture, forming a bimolecular layer at the gas/liquid interface by a self-assembly of the cellulose nanofiber and waterborne polyurethane nanoparticles through electrostatic interactions to obtain a stable Pickering foam; using the stable Pickering foam as a template, drying and solidifying to obtain the waterborne polyurethane foam layer for synthetic leather.

Abstract: A microwave separated field reconstructed device includes: a microwave field reconstructed cavity, a first short circuit plane, a third waveguide flange and coupling windows, wherein connection ports are provided on four ends of the microwave field reconstructed cavity; the microwave field reconstructed cavity is provided with a first waveguide flange, and a second waveguide flange is provided one end of the microwave field reconstructed cavity perpendicular to the first waveguide flange; the first short circuit plane is connected to one end of the first waveguide flange away from the microwave field reconstructed cavity; a second short circuit plane is connected to one end of the second waveguide flange away from the microwave field reconstructed cavity. The input ports are distributed at two ends of the microwave field reconstructed cavity to introduce electric and magnetic fields.

Abstract: A measuring system for analysis of space for dental implant restoration comprises a first measuring assembly for measuring a mouth opening degree and a first gap of plural missing teeth, a second measuring assembly for measuring a second gap of a single missing tooth and an occlusal distance, and a third measuring assembly for measuring a transgingival depth, wherein each of the first measuring assembly, the second measuring assembly and the third measuring assembly comprises a connecting rod and a measuring head disposed at an upper end of the connecting rod. A measuring method for analysis of space for dental implant restoration using the aforesaid measuring system for analyzing is further disclosed.

Abstract: A modified collagen fiber preparation method and application are provided. The modified collagen fiber is prepared by modifying a collagen fiber with a plant tannin; and a method of the preparation includes: mixing the plant tannin with the collagen fiber in a liquid environment with a pH of 5 to 8 to allow a reaction, and washing and drying a product. In the present disclosure, a plant tannin rich in phenolic hydroxyl can be combined with a collagen fiber in various ways such as multi-point hydrogen bonding and hydrophobic bonding, such that the plant tannin structure is introduced into a natural multi-layer micro/nano-structure of the collagen fiber; and due to a large number of phenolic hydroxyl structures in the plant tannin, the collagen fiber introduced with the plant tannin structure shows improved compatibility with a waterborne resin, and can produce strong hydrogen bonding with polar groups in the waterborne resin.

Abstract: A training method for evaluating the bonding accuracy of orthodontic brackets is provided. The evaluation method includes a training device for racket bonding accuracy evaluation which includes virtual teeth with root-shaped connectors and an evaluation base to fix the virtual teeth. Multiple reference lines are marked on the evaluation base, and their intersection is set as the evaluation point. When the virtual tooth is fixed to the evaluation base, the reference lines and the evaluation points are utilized for rapid evaluation of the bonding accuracy of the bracket. Moreover, thanks to their horizontal arrangement, when there are multiple virtual teeth, the evaluation of bracket bonding would be more intuitive and efficient than using the traditional articulator.

Abstract: A meta-surface water load includes a waveguide section, a water load section and two meta-surface plates; the water load section is arranged at a rear end of the waveguide section; the two meta-surface plates are arranged opposite on inner walls of two narrow sides of the waveguide section; the water load section includes a metal casing, a ceramic partition, a water inlet and a water outlet; the metal casing is mounted at the rear end of the waveguide section; cooling liquid flows in the metal casing, entering from the water inlet and leaving from the water outlet; the ceramic partition is for separating interior of the waveguide section and interior of the metal casing; a relative permittivity of materials from front to rear of each meta-surface plate is progressively increased, so that microwave in the waveguide section is propagated to the water load section in one direction.

Abstract: A method for preparing a high molecular weight furan polyamide includes the following steps: 1) charging dimethyl furan dicarboxylate and aliphatic diamine into a reaction container at equal molar weight, and increasing the temperature to 60-120° C. under inert gas; 2) adding a catalyst when the reaction system becomes transparent liquid, increasing the temperature to 140-150° C., and keeping at an atmospheric pressure or a pressure of 41-61 kPa for 0-1 h; and then increasing the temperature to 190-200° C. and reacting for 1-3 h; and 3) depressurizing the system to 3-16 kPa for 0-3 h; and finally, reducing the pressure to 0.003-0.100 KPa for 1-3 h to obtain the high molecular weight furan polyamide.

Abstract: Aspects of the disclosure relate to compositions and methods for delivering a transgene (e.g., a transgene encoding one or more gene products) to a target cell. The disclosure is based, in part, on adeno-associated virus (AAV) capsid protein variants characterized by tropisms for certain cell types (e.g., neurons, muscle cells, bone cells, heart cells, etc.). In some embodiments, recombinant A A Vs (rAAVs) comprising the capsid protein variants (e.g., AAVv66, SEQ ID NO: 1) are more efficiently packaged than rAAVs having certain wild-type AAV capsid proteins. Methods of delivering an rAAV comprising the AAV capsid protein variants are also described by the disclosure.

Abstract: A method for diagnosing and predicting operation conditions of large-scale equipment based on feature fusion and conversion, including: collecting a vibration signal of each operating condition of the equipment, and establishing an original vibration acceleration data set of the vibration signal; performing noise reduction on the original vibration acceleration data set, and calculating a time domain parameter; performing EMD on a de-noised vibration acceleration and calculating a frequency domain parameter; constructing a training sample data set through the time domain parameter and the frequency domain parameter; establishing a GBDT model, and inputting the training sample data set into the GBDT model; extracting a leaf node number set from a trained GBDT model; performing one-hot encoding on the leaf node number set to obtain a sparse matrix; and inputting the sparse matrix into a factorization machine to obtain a prediction result.