Abstract: An autonomous environmental perception, path planning and dynamic landing method includes: obtaining three-dimensional environment information in real time; determining a global starting point and a global end point, and generating an initial path; optimizing the initial path based on a local path optimization algorithm to obtain a first optimized path; when a perception threshold of the current position of the unmanned aerial vehicle is greater than a preset threshold, optimizing the initial path based on a frontier-perceived path optimization method to obtain a second optimized path and a local end point; when the unmanned aerial vehicle advances to the local end point, switching to optimizing the initial path in real time based on the local path optimization algorithm; and when the unmanned aerial vehicle arrives at the global end point, carrying out dynamic landing based on a deep reinforcement learning algorithm.

Abstract: A manipulator execution path planning method for a complex space guided measurement task, includes: determining a measurement space of a manipulator and a starting point and a target point of a path; determining an obstructed space and a free space of the measurement space and a proportion of the obstructed space in the measurement space using a collision algorithm, and classifying and constructing a space compression model according to the proportion of the obstructed space in the measurement space to compress the measurement space and remove an invalid space; finding candidate paths for connecting the starting point and the target point by constructing an adjacent node tree connected topology network; finding a required path in the candidate paths, and performing high-order curve fitting to obtain a final path; discretizing the final path, and solving joint angles of the manipulator to obtain a joint track.

Abstract: A magnetic material and method prepares high-performance composite ferrite for a self-biased circulator. The preparation method includes: (1) preparing BaM ferrite initial powder and NiCuZnSn ferrite initial powder, respectively; (2) mixing the BaM ferrite initial powder, the NiCuZnSn ferrite initial powder and deionized water uniformly in proportion, performing ball milling in a high-energy ball mill, and then obtaining mixed powder after primary pre-sintering, secondary pre-sintering and secondary ball milling; and (3) obtaining the high-performance composite ferrite for the self-biased circulator by a low-temperature magnetic field orientation forming technology and magnetic field heat treatment.

Abstract: A device is for surface strengthening of a metal plate based ultrasonic vibration. The device includes an ultrasonic vibration tool holder and a cutting tool. The ultrasonic vibration tool holder is internally provided with an ultrasonic transducer and an ultrasonic booster; the ultrasonic transducer is configured to transmit vibration to the ultrasonic booster, the ultrasonic booster is configured to drive longitudinal torsion vibration of the cutting tool; an end of the ultrasonic booster facing towards the cutting tool is provided with an adjustment assembly configured for adjusting a longitudinal torsion angle and a rotation speed. Since the device includes the adjustment assembly, the longitudinal torsion angle and the rotation speed of the device can be adjusted according to different processing requirements, so as to perform ultrasonic vibration extrusion strengthening on surfaces of titanium alloy plates and improve surface integrity including microhardness and residual stress.

Abstract: A preparation method, a product and an application of a composite membrane with a self-repairing function are provided by the present application, relating to the technical field of surface treatment of metallic materials. The preparation method includes the following steps: adding cobalt salt, tungsten salt, complexing agent and buffering agent into water to obtain a mixed solution, and adjusting a pH value to acidity to obtain an acidic solution; adding cerium oxide and surfactant into the acidic solution to obtain an electrolyte system; and placing a metal substrate in the electrolyte system for electrodeposition to obtain the composite membrane with self-repairing function. By means of constant potential composite electrodeposition on a metallic material substrate, the invention eventually forms a micron-scale composite membrane with a self-healing function and a thickness of 6-8 micrometers on the surfaces of the metallic materials.

Abstract: Disclosed is a cloud-native application programming interface (API) recommendation method fusing data augmentation and contrastive learning. Service information is included on the basis of a service information double-graph structure, and a mutual attention mechanism is designed to compute an importance degree of each layer of information. A data optimization method for sequence information based on functional similarity and a computation method for similarity between services based on two parts of information are provided; on this basis, data of a service invocation sequence is augmented with the idea of contrastive learning to form an augmented sequence pair; a computational contrastive loss function is combined with a pair-wise recommendation loss function to optimize an overall model, thereby improving the effect of a service recommendation model; and according to a feature embedding representation result of a service, pair-wise recommendation scores are computed to complete service recommendation.

Abstract: A denoising method based on a multiscale distribution score for a point cloud includes: constructing a two-layer network model based on multiscale perturbation and point cloud distribution, where the two-layer network model includes a feature extraction module for extracting a feature of the point cloud and a displacement prediction module for predicting a displacement of a noise point; constructing a point cloud noise model for improving a denoising effect and retaining a sharp feature and avoiding reducing quality of point cloud data; extracting a global feature h by inputting the point cloud data into the feature extraction module; iteratively learning the displacement of the noise point by the displacement prediction module according to a feature obtained by the feature extraction unit; and defining a loss function of network training, and completing convergence under the condition that the loss function reaches a set threshold or a maximum number of iterations.

Abstract: A digital twin based method for monitoring behavior of a passenger on an escalator includes: first, constructing a digital twin virtual scene of the escalator carrying the passenger; constructing a virtual person model in a physics engine, generating various types of risky behavior in reality, and outputting different types of behavior of a virtual person; second, through a human posture recognition method for monitoring behavior of a passenger, extracting a feature map as an input by means of a visual geometry group 19 (VGG19) pre-training network, to enter part affinity fields (PAFs) and a part confidence map (PCM), so as to complete recognition of human postures; classifying the human postures with a support vector machine; and performing emergency stop control on the escalator under risky behavior of the passenger according to a result of posture classification.

Abstract: The present disclosure provides the use of 4-(Phenylethynyl) benzoic acid in preparing a plant growth regulator. 4-(Phenylethynyl) benzoic acid has a formula as C15H10O2, a molecular weight of 222.2390. The optimum concentration of 4-(Phenylethynyl) benzoic acid in the plant growth regulator is in a range of 10 ?M to 200 ?M. The plant growth regulator further contains a pesticidally acceptable carrier. The present disclosure further provides the use of 4-(Phenylethynyl) benzoic acid in regulating plant growth. In the use of 4-(Phenylethynyl) benzoic acid in preparing a plant growth regulator of the present disclosure, 4-(Phenylethynyl) benzoic acid has the ABA-like effects, and is more stable, easily available, cheaper, and environmentally friendly. Therefore, the present disclosure is suitable for large-scale popularization.

Abstract: Provided is a liquid-cooled case which can disperse a cooling liquid by means of a jet cooling technique in an immersed system to dissipate heat uniformly and improve the heat dissipating efficiency. The liquid-cooled case includes cover plates; main boards; a liquid inlet unit, wherein the liquid inlet unit includes a liquid inlet tube and a liquid inlet, the liquid inlet is formed in the case, and one end of the liquid inlet tube is imported into the case through the liquid inlet; and a liquid outlet unit, wherein the liquid outlet unit includes a liquid outlet tube and a liquid outlet, the liquid outlet is formed in the case, and one end of the liquid outlet tube is exported out of the case through the liquid outlet. The liquid-cooled case further includes flow guide blocks which are arranged on the cover plates or the main boards.

Abstract: The present invention discloses a high-resistivity sintered samarium-cobalt magnet and a preparation method thereof. According to the present invention, considering the specialty of sintered samarium-cobalt magnetic powder, fluoride or oxide is firstly prepared into nano-powder using high-energy ball milling, and the samarium-cobalt magnetic powder is prepared separately by rolling ball milling or high-speed jet milling, and then a certain electric field is applied in a fluoride suspension to drive the fluoride nano-powder to evenly cover a surface of the samarium-cobalt magnetic powder. The present invention breaks through the technical bottleneck that fluoride/oxide can improve the resistivity of a samarium-cobalt magnet but result in deterioration of the magnetic properties.

Abstract: The present invention discloses a method for preparing high-performance anisotropic rare-earth-free permanent magnets, comprising the steps of: forming alloy ingots by melting according to a nominal composition of MnxBi100-x, (45?×?55); then coarsely crushing the alloy ingots and passing the crushed material through a 100-mesh sieve to obtain coarse powder; putting an appropriate amount of MnxBi100-x alloy coarse powder obtained into a ball-milling tank together with non-magnetic steel balls, with a ratio of ball to powder of 10:1; adding an appropriate amount of ethanol as solvent, and then adding a non-ionic surfactant polyvinylpyrrolidone (PVP) accounting for 5-15% of the power mass to assist in low-energy ball milling; washing the slurry obtained in anhydrous ethyl alcohol, and orientating and curing the washed magnetic powder in a magnetic field after adding binder to obtain high-performance anisotropic Mn—Bi alloy magnets finally.

Abstract: Disclosed are a dual-optical-path spectrophotometer and a color measurement method thereof. The spectrophotometer includes an integrating sphere, a light source, and a sensor. A second shutter, a semi-reflecting and semi-transmitting device and lenses are arranged between the detection hole and the sensor, and a light guide device and a first shutter are arranged between a light guide hole formed in the integrating sphere and the semi-reflecting and semi-transmitting device. The color measurement method includes the following steps. A first shutter is closed, a second shutter is opened, light, reflected by the measuring opening, enters a sensor and the sensor measures a spectral reflected signal of the object surface. The first shutter is opened, the second shutter is closed, reflected light enters the sensor, and the sensor measures a spectral reflected signal of a light source. A final sampled signal is calculated.

Abstract: Disclosed are a colorimeter and a reflectivity measuring method based on a multichannel spectrum. The colorimeter includes a main unit and a calibration box, wherein the main unit includes an integrating sphere, a light source and a main sensor, a detection hole is formed in one side of a top of the integrating sphere, a light-through hole is formed in a side of the integrating sphere, and a measuring port is formed in a bottom of the integrating sphere, the light source is arranged outside the light-through hole, and the main sensor is arranged outside the detection hole; the calibration box includes a housing and a white board arranged at a top of the housing, the white board is correspondingly matched with the measuring port, and the calibration box is connected with the main unit; the sensor is a multichannel spectral sensor.

Abstract: A compound plant-derived molluscicide for controlling Pomacea canaliculata and a preparation method and application thereof are disclosed. The compound plant-derived molluscicide is prepared from following raw materials in proportion by weight: 40-45% of water extract of Solidago canadensis L. leaves, 45-50% of water extract of Lantana camara L. roots, 0.1-0.2% of active ingredient stabilizer, and 0.1-0.2% of preservative; and a balance is ultrapure water. The disclosure has rich raw material resources, low cost, good molluscicidal effect, sustained and stable efficacy, non-toxic effect on freshwater fish, and meets the requirements of environmental protection.

Abstract: A molecular marker for the selection and breeding of fine-wool sheep is disclosed. The marker is an STR marker comprising a (CA)n repeat core sequence, with n between 5 and 24 that can be obtained by PCR amplification of genomic DNA of sheep using the primers shown in SEQ ID NO: 1 and SEQ ID NO: 2 and sequencing the PCR product. When n is 17 or 18, a sheep is a fine-wool breed, and when n is 23 or 24, a sheep is a non-fine-wool breed. When the CA repeat is discontinuous, i.e., divided into two segments (e.g., 12+11 or 13+11) separated by two bases TA or GA, a sheep is a hybrid breed of fine-wool sheep and non-fine-wool sheep. Use of the marker provides methods of identifying of fine-wool sheep breeds, and efficient and accurate selection of fine-wool sheep or the hybrid offspring of fine-wool sheep for breeding.

Abstract: Smart glasses with an eye protection function comprise an adjustable focus liquid lens assembly and a drive mechanism. The lens assembly comprises a first lens, a second lens, and a transparent liquid-filled flexible film sandwiched between the first lens and the second lens. The focal length of the lens assembly is determined by the first lens, the second lens, and the flexible film together. The focal length of the flexible film changes as a thickness of the flexible film changes. The drive mechanism is configured to drive the flexible film to deform and thus enable the thickness of the flexible film to be changed such that the focal length of the lens assembly is switched between the first focal length and the second focal length. The glasses enable a user wearing it to blink his or her eyes unconsciously, thereby overcoming the drawback of prior art, and enhancing user experience.

Abstract: For sewage sludge reduction, an apparatus includes a front-end auxiliary filter plate, a back-end auxiliary filter plate, and a plurality of filter plate modules disposed between the front-end auxiliary filter plate and the back-end auxiliary filter plate. Each filter plate module includes a middle main filter plate, a middle auxiliary filter plate, and a plurality of electromagnetic modules comprising an electromagnetic coil wound around an electromagnetic core. The middle main filter plate and the middle auxiliary filter plate are disposed at opposite sides of the electromagnetic modules. A plurality of microwave generators send microwaves through microwave acting channels to irradiate the sewage sludge. An electric current is applied to the electromagnetic coil, attracting the middle auxiliary filter plates and the main filter plates and applying pressure to the sewage sludge.

Abstract: A bionic robot and a spine apparatus thereof. Magnetorheological fluids are filled in the cavity, the first tube and the second tube to actuate the first end of the piston rod, so that the piston rod is actuated to move along the axial direction of the cavity. The excitation coil is wound around the first tube. When the controller provides a variable current for the excitation coil, the excitation coil produces a variable magnetic field at the first tube, thereby causing a magnetorheological effect that the magnetorheological fluid is in low liquidity and high viscosity. Then, the transmission speed of the piston rod is changed, which is presented as a damping characteristic, reducing the pause and transition in the spine apparatus, and improving the flexibility and the bionic performance of the robot.

Abstract: For sewage sludge reduction, an apparatus includes a front-end auxiliary filter plate, a back-end auxiliary filter plate, and a plurality of filter plate modules disposed between the front-end auxiliary filter plate and the back-end auxiliary filter plate. Each filter plate module includes a middle main filter plate, a middle auxiliary filter plate, and a plurality of electromagnetic modules comprising an electromagnetic coil wound around an electromagnetic core. The middle main filter plate and the middle auxiliary filter plate are disposed at opposite sides of the electromagnetic modules. An electric current is applied to the electromagnetic coil, attracting the middle auxiliary filter plates and the main filter plates and applying pressure to the sewage sludge.