Abstract: A method for determining ciprofloxacin in a meat product based on an enzyme-linked upconversion fluorescence and potassium titanium oxalate system is provided. An enzyme-linked upconversion nanoparticle solution is mixed with an aptamer-bound magnetized polydopamine solution to obtain a fluorescence-ultraviolet dual-signal detection system. A fluorescence standard curve and a colorimetric standard curve for the ciprofloxacin content determination are created through the fluorescence-ultraviolet dual-signal detection system in combination with potassium titanium oxalate and hydrogen peroxide. A fluorescence intensity signal characteristic value and an ultraviolet absorbance signal characteristic value of a meat sample solution are determined. A ciprofloxacin content in the meat sample is calculated according to the fluorescence standard curve and the colorimetric standard curve.

Abstract: A heat recovery system for hydrogen production with a solid oxide electrolysis cell, including a water storage tank, a solar cell panel, a low-temperature metal hydrogen storage tank, an evaporator, a high-temperature metal hydrogen storage tank, a heat exchanger, a solid oxide electrolysis cell, a separator, and a reactor is provided. After water in the water storage tank sequentially passes through the solar cell panel, the low-temperature metal hydrogen storage tank, the evaporator, the high-temperature metal hydrogen storage tank, and the heat exchanger for multi-stage heat exchange, water vapor reaching the working temperature enters the solid oxide electrolysis cell. The hydrogen generated after electrochemical reaction and unused water vapor flow out from the solid oxide electrolysis cell, firstly exchange heat with to-be-reacted water vapor through the heat exchanger and then enter the separator.

Abstract: A method used to repair a workpiece through a combination of laser and an electrochemical reaction is provided. A tool anode is arranged on the back side of the workpiece and is spaced therefrom. A laser beam is focused on an outer surface of the workpiece to realize localized repairing on the back side. The method realizes localized coating repairing on the back side of the workpiece through coordination between the thermal effect of the laser and the electrochemical deposition based on the characteristic of high thermal conductivity of the workpiece. The electrodeposition reaction does not occur in regions that do not need to be repaired. The operating process is simple, the cost of the plating solution is largely reduced, and the problem that the coating on the inner wall of the thin-walled workpiece is difficult to repair due to stripping is solved.

Abstract: A sphere precision machining device and a machining method comprise a cavity, an abrasive grain stream, and a circulation device. The cavity holds the workpiece, and comprises two hollow hemispheres, each of said two hemispheres being provided with a main flow channel. Said main flow channel is connected to the cavity. One end of the main flow path of each of the two said hemispheres is connected to a circulating means by which a stream of abrasive grains is made to grind the workpiece. A plurality of main flow channels are disposed homogeneously inside the hemisphere, each of said main flow channels being provided with a plurality of branch flow channels connected to the cavity, said branch flow channels tapering in the flow direction. The present disclosure uses the difference in abrasive grain flow pressure on the surface of the workpiece to achieve precision machining.

Abstract: An intelligent electromagnetic induction heating leveling system, comprising: a trolley type leveler, an unmanned aerial vehicle temperature measurement device, indoor positioning devices used for converting position information of a trolley of the trolley type leveler and the unmanned aerial vehicle temperature measurement device into position parameters, and a control system. The system can perform, according to preset data parameters, data transmission by means of a wireless local area network and the unmanned aerial vehicle temperature measurement device and control the unmanned aerial vehicle temperature measurement device to move to a specified position. The system intelligently controls the leveling temperature and leveling time of a leveling area, and thus may be suitable for leveling of weld joints having different sizes and depths, and achieve a good leveling effect. Also provided is an intelligent electromagnetic induction heating leveling method.

Abstract: A hydro-mechanical series and parallel transmission device and a control method thereof are provided. The device includes an input shaft assembly, a hydraulic transmission assembly, a planetary gear transmission assembly, an intermediate gear transmission assembly, and an output shaft assembly. Switching among a hydraulic transmission mode, a mechanical transmission mode, and a hydro-mechanical composite transmission mode is implemented through combination and engagement/disengagement of clutches and brakes. The hydro-mechanical series transmission is used to expand the speed regulation range of the hydraulic transmission and is combined with the hydraulic transmission to meet the requirements on precision and the speed regulation range. The requirements of low-power and high-power operations are met through combination of the hydro-mechanical series and parallel transmissions. Multiple transmission modes are formed to adapt to the working conditions of startup, operation, and transfer.

Abstract: Disclosed is a microreactor for continuous flow synthesis of 2,5-furandicarboxylic acid, the microreactor includes a first container, a collection device, an injection pump, a first flow pump, a second flow pump, a first microreactor substrate, ion exchange resin adsorption pipes, activated carbon adsorption pipes, a second microreactor substrate, an oxygen source, a first T-connector, a second T-connector, and a third T-connector; where the first container is connected to the first T-connector via the first flow pump, the injection pump is connected to the first T-connector, the third T-connector is connected to the first T-connector and the first microreactor substrate, respectively, the first microreactor substrate is connected to the ion exchange resin adsorption pipes, the activated carbon adsorption pipes, the second T-connector, and the second microreactor substrate in sequence, and the oxygen source is connected to the second T-connector.

Abstract: A device for measuring and calibrating the ground pressure of the seeding depth limiting wheels includes: a main body, connected to a pair of depth limiting wheels; a pressure adjusting member, arranged on the main body and configured to adjust a pressure of the depth limiting wheels to ground; a pressure sensor, arranged on the main body and configured to detect an actual pressure output by the pressure adjusting member; and a pressure acquisition calibrator, configured to detect a ground pressure applied by the depth limiting wheels on ground; and automatically fit a plurality of actual pressures and a plurality of ground pressures to establish a model for measuring ground pressure of a pair of depth limiting wheels. The device can automatically acquire a plurality of actual pressures and a plurality of ground pressures to establish a model for measuring ground pressure of a pair of depth limiting wheels.

Abstract: A self-adaptive control system for height and operation of ratooning rice stubble cutting includes a stubble righting device, a profiling contact sensor, a speed radar, and a controller; the stubble righting device is installed at the rear of the harvester, and is connected to the bracket by the stubble righting device hydraulic cylinder; the profiling contact sensor is configured to detect the height of the header above the ground and transmit data to the controller; the speed radar is configured to obtain and transmit speed information of the harvester to the controller; the hydraulic valve block is installed on the chassis frame and connected to the header lifting hydraulic cylinder and the stubble righting device hydraulic cylinder respectively; input terminals of the controller are connected to the profiling contact sensor and the speed radar, and output terminals of the controller are connected to the motor and hydraulic valve block.

Abstract: Disclosed is a floating platform integrating wave attenuation with marine energy power generation and a working method thereof, the platform includes a breakwater, a tuned damping wave energy converter, and an offshore floating wind turbine. The breakwater includes double-cylindrical-boxes and connecting bulkheads, and a moon pool area is formed in a middle of the breakwater; the offshore floating wind turbine and the tuned damping wave energy converter are both connected to the breakwater through a connecting rod. A circular groove is formed on an inner side of each of the connecting bulkheads of the breakwater. The breakwater provides the floating base and power generation environment for the offshore floating wind turbine and the tuned damping wave energy converter, and a plurality of the tuned damping wave energy converters can be disposed, and are evenly distributed beneath the offshore floating wind turbine.

Abstract: Provided are a hydrogen-sensitive material resistant to humidity interference, a semiconductor resistive hydrogen sensor, and an intelligent hydrogen sensing system, and a preparation method and use thereof, which relate to the technical field of gas sensors. The hydrogen-sensitive material resistant to humidity interference includes a three-dimensional (3D) porous non-conductive metal oxide substrate, a nano-scale WO3-x film deposited on an outer surface and an inner pore surface of the 3D porous non-conductive metal oxide substrate, and Pd nanoclusters diffusely distributed on a surface of the nano-scale WO3-x film, wherein the nano-scale WO3-x film is formed from oxygen vacancy-containing tungsten oxide.

Abstract: A hybrid transmission device with a mechanical continuously variable transmission and a control method thereof are provided. The device includes an input shaft assembly, a front planetary gear transmission assembly, a rear planetary gear transmission assembly, an output shaft, and a mechanical continuously variable transmission. Single transmission modes and hybrid transmission modes are implemented through combination and engagement/disengagement of brakes and clutches. The device and the method realize free switching among various transmission modes and integrates the single transmission modes and the hybrid transmission modes, thereby increasing the degree of freedom in adjustment and expanding the speed regulation range. Input and output shafts of a front cup wheel and ring disc transmission mechanism and a rear cup wheel and ring disc transmission mechanism are coaxial, so that the structure is compact and intermediate rollers can stably and reliably transmit large torque.

Abstract: A hydro-mechanical series and parallel transmission device and a control method thereof are provided. The device includes an input shaft assembly, a hydraulic transmission assembly, a planetary gear transmission assembly, an intermediate gear transmission assembly, and an output shaft assembly. Switching among a hydraulic transmission mode, a mechanical transmission mode, and a hydro-mechanical composite transmission mode is implemented through combination and engagement/disengagement of clutches and brakes. The hydro-mechanical series transmission is used to expand the speed regulation range of the hydraulic transmission and is combined with the hydraulic transmission to meet the requirements on precision and the speed regulation range. The requirements of low-power and high-power operations are met through combination of the hydro-mechanical series and parallel transmissions. Multiple transmission modes are formed to adapt to the working conditions of startup, operation, and transfer.

Abstract: The present disclosure discloses a preparation method for an internal laser-induced carbonization layer of aramid fiber resin matrix composite material. The surface of sample of aramid fiber resin matrix composite material is wiped with anhydrous ethanol; the sample of aramid fiber resin matrix composite material was placed on the laser sample platform, and the defocusing amount between the laser focus and the upper surface of the sample was negative. Infrared picosecond laser was used to scan the sample of aramid fiber resin matrix composite material for several times. Since the laser absorption rate of the surface epoxy resin was very low, most of the laser energy passed through the epoxy resin layer and directly acted on the internal aramid fiber. The laser carbonized the internal aramid fiber without damaging the surface resin, and formed a carbonized line along the laser scanning path to realize the conductivity of aramid fiber resin matrix composite.

Abstract: An ultrasonic-stirring narrow gap welding system and a welding method, and the ultrasonic-stirring narrow gap welding system includes a welding machine power source, a wire feeder, a narrow gap welding torch, and an ultrasonic stirring subsystem. A welding wire is fed into a narrow gap through the narrow gap welding torch provided above a groove, to generate an arc for welding. The ultrasonic stirring subsystem includes a stirrer and an ultrasonic device, a stirring rod is connected to the ultrasonic device and inserted into a molten pool to form a preset angle relative to the welding wire for stirring, and an ultrasonic-stirring narrow gap welding mode is realized.

Abstract: A fluorescence detection kit for the enzymatic activity of activated complement C1s, a detection method using the same, and use of the same are provided for a purpose of detecting the enzymatic activity level of the activated complement C1s in a sample. Specific capture and magnetic separation of C1s in a C1s standard or a sample to be tested are performed based on a magnetic bead precoated with a C1s recombinant antibody. After non-specific binders are removed, a fluorescence resonance energy transfer (FRET) fluorescein labeled substrate peptide for enzyme digestion by C1s is added, and a fluorescence signal in an obtained reaction system is detected with a microplate reader. Accordingly, the enzymatic activity of activated C1s is quantitatively determined by detecting changes of a fluorescence intensity.

Abstract: A method of strengthening through real-time coupling of electrical pulses and laser shock waves is provided. The initial time and duration of the electrical pulses are controlled to be matched with the initial time and duration of the laser shock waves, so that the electrical pulses and the laser shock waves are coupled in real time for material strengthening, the plasticity and the strength of the material are greatly improved, and a large area of the workpiece is uniformly strengthened. By simultaneously introducing the electrical pulses into the pulse current-assisted LSP, a great strengthening effect is achieved through the combination of the electrical pulses and the pulse current-assisted LSP in a short time, thereby reducing the internal defects of the material to a certain extent and further increasing the fatigue life of the material.

Abstract: A method for designing a cylindrical skiving tool without a geometric relief angle is provided. The method includes: designing a teeth number and a crossed shaft angle of a tool; calculating a barrel-shaped conjugate surface conjugated to a tooth surface of a to-be-machined gear; determining an offset of a rake face of the cylindrical skiving tool from a middle section of the barrel-shaped conjugate surface; designing a helix angle of the tool; designing a rake angle of the tool; calculating an edge profile of the rake face; obtaining design parameters and mounting parameters of the skiving tool; manufacturing the tool according to the design parameters of the tool, and performing skiving on a skiving machine according to the mounting parameters of the tool. The present disclosure provides a skiving method under a spatially-offset conjugate condition, to solve the problems of fast accuracy degradation and short service life.

Abstract: The present disclosure provides an air-assisted ultrasonic magnetization electrostatic nozzle, and belongs to the technical field of agricultural equipment. The air-assisted ultrasonic magnetization electrostatic nozzle includes a Laval tube, a liquid inlet section, a charging electrode plate, and a resonant cavity. After being accelerated by the Laval tube, an air impacts a liquid that enters through the liquid inlet section arranged at an outlet end of the Laval tube. The liquid is impacted into fine droplets and the fine droplets are positively electrified after passing through the charging electrode plate arranged at an outlet end of the liquid inlet section, to obtain electrified droplets. The electrified droplets enter the resonant cavity and are magnetized, to obtain magnetized droplets. The magnetized droplets are atomized and sprayed out by a metal film arranged at an outlet end of the resonant cavity.

Abstract: A multi-task joint perception network model and detection method for traffic road surface information can simultaneously detect a lane line and a drivable area. A coordinate attention mechanism is integrated into a traditional feature extraction network to ensure that a feature extraction effect is enhanced while a calculated amount is not increased. In a neck network, a dilated convolution residual module is proposed to enhance performance of prediction of details by the network, and a decoder part shares features of the drivable area into lane line detection to enhance a lane line detection effect under complex road conditions. In a training stage, there is provided a alternating optimization training method to improve integral segmentation performance of the model. The multi-task joint perception network model and detection method realizes quite high accuracy and excellent speed performance in a challenging BDD100K dataset.