Abstract: An insertion and deletion (InDel) molecular marker of a hisD gene of ultrasonically-mutagenized Salmonella typhimurium (S. typhimurium) and use thereof are provided. Through ultrasonic mutagenesis to S. typhimurium and sequencing, it is found that all InDel mutations occur in a core mutation region of the hisD gene. Therefore, the core mutation region is used as the InDel molecular marker to determine an insertion or a deletion of a gene reverse mutation, and the InDel molecular marker can also be used to analyze a relationship between a sequence of the hisD gene and a function of a protein encoded thereby.

Abstract: An aluminum alloy flux-cored welding wire and a fabrication method thereof are provided. In the present disclosure, a mixed salt is used as a filler for the flux-cored welding wire, and a reaction between the mixed salt and a welding base metal is directly induced through welding heat to produce in situ nanoparticles, which not only reduces a production cost of the welding wire, but also enhances the bonding between the added particles and the base metal through the prominent wettability between the in-situ enhancement particles and the base metal; and a rare earth element is added to significantly refine grains, which provides a new idea for the selection of a flux-cored welding wire for 7XXX aluminum alloy welding.

Abstract: A gear-hydraulic-rhombic pyramid integrated multi-mode hybrid transmission device includes an input assembly, a hydraulic transmission mechanism, a front planetary gear mechanism, a rhombic pyramid-type continuously variable transmission mechanism, a rear planetary gear mechanism, an output assembly, a clutch assembly, and a brake assembly. The clutch assembly connects an output end of the input assembly to an input end of the hydraulic transmission mechanism and an input end of the front planetary gear mechanism. The clutch assembly connects an output end of the hydraulic transmission mechanism to the front planetary gear mechanism and the rear planetary gear mechanism. The clutch assembly connects the front planetary gear mechanism, the rhombic pyramid-type continuously variable transmission mechanism, the rear planetary gear mechanism, and the output assembly in sequence. The clutch assembly and the brake assembly provide a continuous transmission ratio between the input assembly and the output assembly.

Abstract: A single winding hybrid excitation magnetic field modulation motor includes a stator, a rotor, a winding and a permanent magnet. The stator includes a stator iron core, a permanent magnet and a winding. The stator iron core includes stator teeth and stator yoke. Each stator tooth is split into an equal number of split teeth facing the air gap side. All permanent magnets are embedded in the grooves between the split teeth on the same stator tooth, the polarity of all permanent magnets located on the same stator tooth is the same, and the polarity of the permanent magnets on the adjacent stator teeth is opposite. A single non-overlapping concentrated winding is wound on all stator teeth, and DC current and AC current are simultaneously passed into each set of windings, in which field winding and permanent magnet are excited together to form hybrid excitation.

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: An adaptive device includes an transmission assembly and a laser sensor control assembly, where the transmission assembly includes a rotating shaft of a roller, a harvesting part, a motor base plate, a transmission belt of the harvesting part, a transmission shaft of a motor A, motor arms, the high-power motor A, a high-power motor B, a transmission shaft of the motor B, a transmission belt of the roller, and a rotating shaft of the harvesting part; and the laser sensor control assembly includes the motor base plate, upright lifting columns, a control base plate, a battery, a power distribution board, a voltage reduction module, electronic speed controllers, a main control board, a low-power motor, a laser sensor base plate, a laser sensor, tube clamps, a rotating shaft of the laser sensor, and a bearing for stabilizing the rotating shaft of the laser sensor.

Abstract: A structure self-adjusting type vehicle-mounted magnetic suspension flywheel battery coping with multiple operation modes and an operating method thereof are provided. An ant-nest type channel is formed in a radiator of the flywheel battery along a circumferential direction, and a plurality of counterweight magnetic adsorption devices are symmetrically embedded in a flywheel lower sphere. When the flywheel battery operates in a charging mode, a standby mode or a discharging mode, the operation mode of the motor is flexibly changed according to different recovered energy levels or output energy levels, and the loss in the magnetic bearing system is reduced through matching of different types of magnetic bearings according to different disturbance levels. The low-loss, high-safety and stable operation of the vehicle-mounted magnetic suspension flywheel battery in various operation modes can be realized.

Abstract: An aluminum alloy flux-cored welding wire and a fabrication method thereof are provided. In the present disclosure, a mixed salt is used as a filler for the flux-cored welding wire, and a reaction between the mixed salt and a welding base metal is directly induced through welding heat to produce in situ nanoparticles, which not only reduces a production cost of the welding wire, but also enhances the bonding between the added particles and the base metal through the prominent wettability between the in-situ enhancement particles and the base metal; and a rare earth element is added to significantly refine grains, which provides a new idea for the selection of a flux-cored welding wire for 7XXX aluminum alloy welding.

Abstract: A method for highly-sensitive and rapid detection of a pesticide residue based on an imprinted metal-organic framework (MOF) probe is provided. A molecularly imprinted MOF enzyme-mimic probe is used as a colorimetric probe to catalyze the oxidation of a substrate, thereby enabling a color change of a system; a low-cost filter paper is used as a substrate for supporting the colorimetric probe, including a quality control zone, a standard zone, and a detection zone; in the quality control zone, the optimal colorimetric analysis parameters can be selected according to the temperature, humidity, and light, etc. of an environment to be tested; the standard zone is a standard colorimetric zone obtained through the dropwise addition of standards with different concentrations and is provided to establish a colorimetric analysis mathematical model; and the detection zone is provided for the detection of an actual sample.

Abstract: The present invention discloses an in-place non-contact detection method for a shaft workpiece. The method includes: establishing a detection system, calibrating the detection system and establishing a detection coordinate system; analyzing a pose of a workpiece in the detection system to establish a coordinate system of a workpiece clamping device; controlling the workpiece clamping device of a shaft workpiece processing machine tool to rotate, continuously acquiring data by a linear laser measuring instrument, and calculating and analyzing the acquired data to obtain an ideal reference axis of the shaft workpiece; continuously acquiring data of a detection part, and calculating and analyzing the acquired data to obtain actual machining precision of runout of a shaft neck of a camshaft; and continuously acquiring data of the detection part, and calculating and analyzing the acquired data to obtain machining precision of coaxiality of the shaft workpiece.

Abstract: The present invention provides a material-based subdomain hybrid cellular automata algorithm for solving material optimization of thin-walled frame structures, including an outer loop and an inner loop: the outer loop is to define and update the target cost for the inner loop; the inner loop is to adjust material using a PID control strategy according to the nominal flow stress of a current cell and the nominal flow stress of candidate materials, so that a current cost of the inner loop converges to the target cost.

Abstract: A strong-robustness method for extracting early degradation features of signals and monitoring an operational status of a device is provided. Acquired vibration signal data of a rotating mechanical device is grouped at equal time intervals in a chronological order. Compression conversion is performed on the data, a newly defined function is solved, thereby a performance degradation index of the device is obtained. Data of the device in a normal status is obtained by determining an overall trend of an Exponentially Weighted Moving Average (EWMA) statistic, and a control limit for the EWMA statistic is constructed by using the data in the normal status. The calculated performance degradation index of the device is converted into an EWMA statistic, and the EWMA statistic is compared with the control limit. If the EWMA statistic does not fluctuate about a center line or exceeds the control limit, a monitored state is out of control.

Abstract: A Bacillus velezensis (B. velezensis) strain bred through ultrasound-assisted adaptive evolution and use thereof are provided. In the present disclosure, a B. velezensis strain (B. velezensis CICC 23571) is used as a starting strain, and an ultrasound-assisted adaptive evolution process is performed, where a proportion of organic nitrogen in a medium is continuously reduced and proportions of inorganic nitrogen and a sugar source are increased to obtain a B. velezensis mutant strain with a high polypeptide yield. Different metabolic pathways in the mutant strain are enhanced, such that the mutant strain can efficiently convert inorganic nitrogen into organic nitrogen or reduce the deaminization of organic nitrogen, and finally a yield of polypeptides is greatly increased.

Abstract: A rapid detection tool for a coaxial relationship based on a photosensitive material and a detection method using the same are used to detect coaxiality of two through-holes in the same workpiece to be detected. An image processing unit and a control unit are mounted outside a light-shielding box. Light sources, cameras, sensors, and an air cylinder are mounted in the light-shielding box. A photosensitive plate coated with a photosensitive resin is placed between the two holes, and two sides are irradiated by the light sources. Coordinates of centers of circular patterns formed on the photosensitive plate are calculated so that a coaxial relationship between the two holes can be accurately obtained. An output rod of the air cylinder is controlled to extend outward to reject a workpiece to be detected not meeting requirements.

Abstract: A stress and texture morphology controlling method for preparing a super-hydrophobic surface of an aluminum alloy by laser etching includes the following steps: pretreating a surface of an aluminum alloy; fixing a pretreated aluminum alloy to an ultrasonic vibration platform, continuously charging flowing liquid nitrogen to a to-be-machined surface of the aluminum alloy, and controlling a flow of the liquid nitrogen to cool the to-be-machined surface of the aluminum alloy and keep the to-be-machined surface of the aluminum alloy at a low temperature; keeping stable flowing of the liquid nitrogen on the to-be-machined surface of the aluminum alloy after the to-be-machined surface of the aluminum alloy is cooled, using the ultrasonic vibration platform to generate a high-frequency ultrasonic vibration field, and etching the to-be-machined surface of the aluminum alloy to form a super-hydrophobic textured micro-nano structure surface; and reducing a surface energy of the super-hydrophobic textured micro-nano str

Abstract: A gear-hydraulic-rhombic pyramid integrated multi-mode hybrid transmission device includes an input assembly, a hydraulic transmission mechanism, a front planetary gear mechanism, a rhombic pyramid-type continuously variable transmission mechanism, a rear planetary gear mechanism, an output assembly, a clutch assembly, and a brake assembly. The clutch assembly connects an output end of the input assembly to an input end of the hydraulic transmission mechanism and an input end of the front planetary gear mechanism. The clutch assembly connects an output end of the hydraulic transmission mechanism to the front planetary gear mechanism and the rear planetary gear mechanism. The clutch assembly connects the front planetary gear mechanism, the rhombic pyramid-type continuously variable transmission mechanism, the rear planetary gear mechanism, and the output assembly in sequence. The clutch assembly and the brake assembly provide a continuous transmission ratio between the input assembly and the output assembly.

Abstract: A generalized autocorrelation method for bearing fault feature extraction under a variable rotational speed condition includes: resampling an original vibration signal in an order domain based on instantaneous phase information by using an order tracking processing method, to greatly weaken a frequency modulation phenomenon; further weakening background noise in consideration of a correlation between a plurality of adjacent fragments by using a generalized autocorrelation method; and controlling an accumulation of periodic disturbances by considering only a correlation between several adjacent signal fragments based on that conventional noise resistant correlation (NRC) methods consider a correlation between all signal fragments and cannot eliminate influence of accumulated periodic disturbances. Compared with the conventional methods, this method overcomes the difficulties caused by mutually restricting signal features, and achieves a better effect.

Abstract: A method for three-dimensional (3D) characterization of a molybdenum disulfide sample based on machine learning (ML) includes: subjecting the molybdenum disulfide sample to optical imaging and atomic force microscopy (AFM) characterization; constructing and training a model through a random forest (RF) algorithm based on a dataset of a correspondence between a color feature of an optical image and AFM height data of the molybdenum disulfide sample; and inputting a color feature value of the optical image of the molybdenum disulfide sample into the model to acquire height data of the molybdenum disulfide sample, and filtering to remove a local noise and a local abnormal point, so as to acquire a final 3D characterization image. The present disclosure has high characterization accuracy and is helpful for scientific researchers to quickly analyze the thickness of a molybdenum disulfide sample through optical imaging without AFM or other characterization instrumentation.

Abstract: A device includes a water storage tank, a control cabin and an operation cabin which are sequentially connected from top to bottom, the operation cabin includes a sealing zone and an operation zone, the sealing zone is located on an inner wall of the operation cabin, a pressure difference between an internal pressure and an external pressure is adjusted to make the maintenance enhancing device separated from or absorbed on a subsea pipeline, and the operation zone is located between the sealing zone and the subsea pipeline.

Abstract: Based on a perception of an external environment of an autonomous vehicle, a driving style is recognized according to driving characteristic parameters indicating a driving aggressiveness degree and a mode shift preference, in response to a complexity of an individual driving behavior cognition. After the driving style is recognized, in accordance with group behavior characteristics of the motion bodies in the environment, a time-varying complex dynamical network is established based on a complex network with the motion bodies as nodes and roads as constraints, to serve as a complex environment model of the autonomous vehicle. Finally, the nodes in the complex environment model are parametrically represented to realize the node difference cognition of the complex environment. The nodes in the complex environment model are hierarchized by using an agglomerative algorithm to realize the hierarchical cognition of the complex environment.