Abstract: Disclosed are a spandex fiber with a reversible triple-shape memory effect and a preparation method thereof. In the present disclosure, the spandex fiber includes the following raw materials in parts by weight: 3 parts to 100 parts of a crystalline polyester diol or a crystalline polyether diol, 1 part to 30 parts of a diisocyanate, 0.1 parts to 15 parts of a polyurethane chain extender, and 0.2 parts to 11 parts of a polyurethane cross-linking agent, where the crystalline polyester diol or the crystalline polyether diol has a number-average molecular weight of 1,000-10,000 Daltons. The spandex fiber has a reversible deformation process, shows an ability to transform between “stretched” and “shortened” states infinitely under the action of a temperature field, and can memorize two temporary shapes. Moreover, the spandex fiber has easily accessible raw materials and a simple preparation method, and is suitable for large-scale industrial production.

Abstract: The disclosure relates to a preparation method of eel polypeptide flavor extract, the eel polypeptide flavor extract, and the eel sauce. The preparation method of the eel polypeptide flavor extract includes the following steps: obtained by using eel processing by-products, eel cutting off the main meat tissues, successively performing microbial fermentation, Maillard reaction and extraction and separation processes. The eel polypeptide extract obtained above is used to making a condiment eel sauce. The eel sauce is nutritious and convenient, it can be used directly for table eating or served as cooking condiments to enhance the aroma and taste of dishes and increase the attractiveness of dishes. The disclosure realizes a new technological research on the preparation of polypeptide and flavor products, opens up a scientific utilization and processing method of seafood processing by-products, and provides a new way for making full use of such resources.

Abstract: The present disclosure discloses a nano-separation refrigeration system and discloses a refrigeration circulation method, wherein the nano-separation refrigeration system includes an evaporator provided with an inlet and an outlet; a condenser provided with a condensation cavity, a gas inlet, a gas outlet, and a liquid outlet, wherein a molecular sieve membrane is disposed in the condensation cavity between the gas inlet and the gas outlet, and the molecular sieve membrane is configured to separate a mixed gas; a first connecting pipe having one end connected to the outlet and the other end to the gas inlet; a second connecting pipe having one end connected to the liquid outlet and the other end to the inlet; a third connecting pipe having one end connected to the gas outlet and the other end to the inlet.

Abstract: A counter-rotating differential speed extrusion device includes a barrel and a screw mechanism in the barrel comprising a first and second screws. A crest diameter and a root diameter of the first screw are respectively meshed with that of the second screw; the first and second screws counter-rotate in differential speeds at a fixed rotation speed ratio; at least one first intermediate circular arc structure with a trend consistent with that of the crest diameter and the root diameter of the first screw is provided between the root diameter and the crest diameter of the first screw, a second intermediate circular arc structure tangent to the first intermediate circular arc structure and having a trend consistent with that of the root diameter and the crest diameter of the second screw is provided between the root diameter and the crest diameter of the second screw.

Abstract: Disclosed are a method and apparatus for SAR image data enhancement, and a storage medium. The method includes: processing an SAR target image by electromagnetic simulation to acquire an SAR electromagnetic simulation image; and processing the SAR electromagnetic simulation image and the SAR target image by a generative adversarial network to obtain a set of virtual samples of the SAR target image.

Abstract: The present disclosure relates to a method for enhancing sematic features of SAR image oriented small set of samples, comprising: acquiring a sample set of an SAR target image, and performing transfer learning and training on the sample set to obtain a initialized deep neural network of an SAR target image, the sample set comprising an SAR target image and an SAR target virtual image; performing network optimization on the deep neural network by an activation function, and extracting features of the SAR target image by the optimized deep neural network to obtain a feature map; and mapping, by an auto-encoder, the feature map between a feature space and a semantic space to obtain a deep visual feature with an enhanced semantic feature.

Abstract: Disclosed are a method and an apparatus for end-to-end SAR image recognition, and a storage medium. According to the disclosure, a generative adversarial network is used to enhance data and improve data richness of a SAR image, which is beneficial to subsequent network training; a semantic feature enhancement technology is also introduced to enhance semantic information of a SAR deep feature by a coding-decoding structure, which improves performances of SAR target recognition; and meanwhile, an end-to-end SAR image target recognition model with high integrity for big scenes like the Bay Area is constructed, which is helpful to improve a synthetic aperture radar target recognition model for big scenes like the Bay Area from local optimum to global optimum, increases the stability and generalization ability of the model, reduces the network complexity, and improves the target recognition accuracy.

Abstract: The present invention discloses a method for preparing an evaporator for reducing water condensing capacity and an evaporator. The preparation method comprises steps of: step A: selecting fins; step B: stacking; step C: arranging tubes; and, step D: expanding tubes. In accordance with the present invention, the existing fins and devices can be used to produce an evaporator in which the distance between two adjacent fins satisfies the requirements of the freezing operation, ensuring the normal operation of an air conditioner when the refrigeration temperature is below 0° C.

Abstract: A device for measuring equivalent shear stress between a shield screw conveyor and modified muck includes a spiral shell, a spiral device, a data calculation module and measurement components, the measurement components include a torque measurement component configured to measure spiral driving torque between the spiral device and the modified muck, an angle measurement component configured to measure a conveying angle of the modified muck, a parameter measurement component configured to measure structural parameters of the spiral device, and a density measurement component configured to measure an average density of the modified muck. The torque measurement component, the angle measurement component, the parameter measurement component and the density measurement component are respectively connected to the data calculation module, and the spiral device is installed in the spiral shell.

Abstract: Disclosed is a method for vein recognition, the method includes: performing a difference operation and a channel connection on two to-be-verified target vein images respectively to obtain a difference image and a two-channel image of the two target vein images; performing the channel connection on the obtained difference image and two-channel image to obtain a three-channel image, so as to use the three-channel image as an input of a CNN network; fine-tuning a pre-trained model SqueezeNet that completes training on an ImageNet; integrating the difference image and the three-channel image through a cascade optimization framework to obtain a recognition result; regarding a pair of to-be-verified images as a sample, transforming the sample, taking the transformed sample as the input of the CNN network, obtaining a recognition result by supervised training on the network.

Abstract: The present disclosure discloses an error modeling method and device for prediction context of reversible image watermarking. A predictor based on omnidirectional context is established; then, the prediction context is self-adaptively error modeled to obtain a self-adaptive error model; and finally, output data from the self-adaptive error model is fed back to the predictor to update and correct the prediction context, so as to correct a prediction value of a current pixel x[i,j]. Since the non-linear correlation between the current pixel and the prediction context thereof, i.e., the non-linear correlation redundancy between pixels can be found by the error modeling of the prediction context of the predictor, the non-linear correlation redundancy between the pixels can be effectively removed. Thus, the embeddable watermarking capacity can be increased.

Abstract: Provided is a flexible temperature sensor including a flexible temperature-sensing fabric, wherein the flexible temperature-sensing fabric includes a fabric base and at least one flexible temperature-sensing conductive fiber, the fabric base is a flat fabric woven from a plurality of insulating fibers, and the temperature-sensing conductive fiber is fixed in the fabric base by weaving. The flexible temperature sensor has the advantages of being easy to fabricate, low in cost, washable, wide in temperature monitoring range, high in sensitivity, good in stability and repeatability, and compatible with existing textile technologies.

Abstract: A new tactile sensor having a sensing layer, and the sensing layer includes a flexible substrate, at least one stress sensing unit, and at least one temperature sensing unit. The stress sensing unit includes a flexible conductive fiber, a top electrode, and a bottom electrode, the flexible conductive fiber is laid flat on the flexible substrate, the top electrode is bendable, and when there is a potential difference between the top electrode and the bottom electrode, a current flows along a radial direction of the flexible conductive fiber; and the temperature sensing unit includes a thermal conductive fiber and two end electrodes, the thermal conductive fiber is laid flat on the flexible substrate, and when there is a potential difference between the two end electrodes, a current flows along an axial direction of the thermal conductive fiber.

Abstract: An intelligent ball passing system is provided, including: a ball passing robot configured for carrying out a ball passing action according to human body postures, including: a video capture device configured for acquiring human body posture data, a movement mechanism configured for driving the ball passing robot to move according to a ball passing instruction, and a central processing module connected to the movement mechanism and the video capture device respectively; and a software system configured for controlling the ball passing robot to carry out the ball passing action, the central processing module recognizing and classifying the human body postures by using the software system that uses a BP neural network.

Abstract: Disclosed is a waterseal virus-killing mask, including a mask body, a liquid virus-killing assembly, and two elastic ear loops. A breather valve is disposed on an outer surface of the mask body. The two elastic ear loops are disposed on two sides of the mask body, respectively. The liquid virus-killing assembly includes a U-shaped tube within which disinfectant is provided. A disinfectant replenishing tube is vertically disposed at an upper end in the middle of the U-shaped tube. A first horizontal straight tube and a second horizontal straight tube are separately disposed at two ends of the U-shaped tube. A left end of the first horizontal straight tube is in communication with an opening of the breather valve. A first filter mesh used to separate water and air is disposed at a right end of the first horizontal straight tube.

Abstract: Disclosed is a device for measuring speed of a tennis ball, which includes: a housing, a power supply, a main control device, a sensor device, a transmission device, a clamping device and a limiting device. The clamping device is clamped at the serve opening of a tennis ball machine, which can detect the serve speed of a tennis ball accurately with simple operation. The transmission device is engaged with the second sensor device, and the housing is slidably connected with the second sensor device. The emitting ends of the second sensor device and the first sensor device are positioned in the same vertical plane. The limiting device is connected with the second sensor device to limit excessive operation of the transmission device.

Abstract: Disclosed are a compressor control system and an air conditioner for wide-range temperature adjustment. The control system includes a power supply, a compressor, a main board, and a first temperature sensor. The power supply is configured to generate a power input voltage. A power voltage input circuit is disposed between the compressor and the power supply. The main board is electrically connected to the power voltage input circuit. During operation, the main board is configured to control connection and disconnection of the power voltage input circuit. The first temperature sensor is configured to detect an indoor temperature, the first temperature sensor is electrically connected to the main board and transmits an electrical signal to the main board, and the first temperature sensor is electrically connected to a first fixed-value resistor.

Abstract: Disclosed is a method for planning screw locking path using an ant colony algorithm, which includes: obtaining designated positions of screw holes to be locked; using a distance between the screw holes to be locked as pheromone; obtaining a set of initial paths for all lockings; determining whether a condition for ending an iteration is met, and the condition is whether all the locking paths have passed through all the designated positions; if the condition for ending the iteration is not met, obtaining a supplementary path for each locking path to form an entire path of each locking path until the condition for ending the iteration is met; taking a set of entire paths of all the locking paths as a set of final paths; obtaining a shortest path from the set of final paths.

Abstract: A double attention network (DANet)-based drone patrol and inspection system for coastline floating garbage, including: an image acquisition module configured to shoot a video of a coastline in need of patrol and inspection by using a drone, and obtain an image from the video; a feature extraction module configured to extract shallow features and deep features, fuse the shallow features and the deep features to obtain a shared feature, and finally output a panoramic recognition result; a network training module configured to perform training on the labeled image so that the network can recognize the coastline and floating garbage; and a path correction module configured to adjust a flying direction of the drone.

Abstract: A vehicle refrigerator is disclosed. The vehicle refrigerator may include a body, a refrigerating system and a driving system. The refrigerating system and the driving system are both arranged in the body. The body is removable in a trunk of a vehicle. The driving system is used for driving the refrigerating system to operate normally, and may include an igniter and an air source. The igniter is connected with the air source. The refrigerating system is used for cooling an inner cavity of the body and is provided with a working medium capable of changing gas and liquid.