858results about How to "Reduce direct contact" patented technology

The lithium nickel manganese oxide positive electrode material, the preparation method thereof and the electrochemical device are characterized in that the lithium nickel manganese oxide positive electrode material provided by the embodiment of the invention comprises a base material and a coating layer located on the surface of the base material, the general formula of the base material is Li (LiaNixMnyMbO4), the element M comprises at least one of Ti, Zr, Al, Nb and Mo, and a is more than or equal to 0.02 and less than or equal to 0.06; 0.45 < = x < = 0.55, 1.4 < = y < = 1.6; 0.05 < = b < = 0.55; a + x + y + b = 2, and the coating layer contains phosphate. According to the lithium nickel manganese oxide positive electrode material, through doping and coating technologies, under the condition that the capacity is not sacrificed, the gas production phenomenon is effectively reduced, the cycling stability of the lithium nickel manganese oxide positive electrode material is improved, and the service life of an electrochemical device applying the lithium nickel manganese oxide positive electrode material is prolonged.

The invention discloses a sow vaccine injection method based on deep learning and machine vision. The sow vaccine injection method comprises the following steps that 1, an AGV chassis is controlled to arrive at a work station according to an instruction; 2, visually recognizing the posture of the sow to be injected, and if the recognition result is that the sow to be injected is in a non-standing posture, driving up the sow to be injected with manual assistance; if the recognition result is a standing posture, visually guiding the mechanical arm to move to a photographing position; 3, the RGBD camera shoots in real time to obtain the injection position and distance of the sow to be injected, and the mechanical arm moves to position the injection clamp to the pre-injection position; 4, injection is completed, and an injection result is recorded; the invention further discloses a sow vaccine injection system based on deep learning and machine vision. Manual operation is replaced by mechanical operation, automation of the vaccine injection process is achieved, direct contact between personnel and sows is reduced, and the risk of infectious disease transmission is reduced.

The invention relates to the technical field of metal bearings, in particular to a reinforced liquid metal sliding bearing. The enhanced liquid metal sliding bearing comprises a rotor, a stator and liquid metal filled in an assembling gap between the rotor and the stator. The fixed positions of the rotor and the stator are provided with a spiral groove structure, a textured microstructure, an infiltration coating and a sealing coating. By adopting the enhanced liquid metal sliding bearing provided by the invention, the wettability and the wear resistance of a bearing rotating pair can be improved, and the problems of coating falling, wear, poor lubrication and the like of the enhanced liquid metal sliding bearing in a high-vacuum, high-temperature, high-pressure, high-speed and high-load use environment are effectively solved. High-pressure sealing is formed on the gaps between the stator and the rotor and between the limiting rings of the stator and the rotor, the liquid metal is kept in the bearing, the assembled bearing does not need a vacuum environment in the transfer process, meanwhile, external gas is prevented from entering the bearing structure, and the possibility that the liquid metal leaks or gets stuck is reduced.

The invention discloses a rapid automatic focusing module and method suitable for a fluorescence microscope. The automatic focusing module comprises a laser, a diaphragm, a collimating lens group, a reflector, a dichroic mirror, an objective lens, a sample to be measured, a telescope lens group, a CCD2 detector, a control system and a displacement platform which are sequentially arranged along a focusing light path, and the sample to be measured, the objective lens, the dichroic mirror, a tube lens and the CCD2 detector which are sequentially arranged along an imaging light path; the collimated laser beam is emitted to the plane where the sample to be detected is located through the objective lens, and then the laser beam is reflected back to the telephoto lens group and converged to the CCD2 detector. According to the offset of the center of the reflected light beam, the relative distance between the objective lens and the to-be-tested sample is moved through a control system, and automatic focusing of a single view field of the to-be-tested sample is achieved; the to-be-measured sample is moved to the focal planes of different object view fields in the X direction and the Y direction and is quickly focused in real time, so that the large-size to-be-measured sample is always kept at the focal plane position, and the image quality and the working efficiency are improved.

The invention discloses a dexterous hand finger based on connecting rod transmission, a bionic mechanical arm and a humanoid robot, belongs to the field of bionic mechanical arms, solves the problem that a transmission mechanism of an existing dexterous hand is low in response speed, and adopts the technical scheme that the dexterous hand finger mainly comprises a finger base and a finger body, a driver and a transmission mechanism in transmission connection with the driver are arranged on the finger base, the driver drives the finger body to bend and / or swing through the transmission mechanism, the transmission mechanism comprises a guide piece and a sliding block installed on the guide piece in a sliding mode, and the sliding block is in transmission connection with the finger body. A traction rope connected with the sliding block is wound on an output shaft of the driver, the driver controls the output shaft to rotate forwards and backwards so as to drag the sliding block to slide back and forth along the guiding piece through the traction rope, and then the finger body is controlled to bend and / or swing. The finger is mainly used for driving the sliding block to move through the pulling rope so as to control the finger body to bend and swing, and the response efficiency of the finger body can be improved.

The utility model relates to an automatic sorting device for lens disassembly, which relates to the technical field of lens disassembly and comprises a storage bin used for storing lenses to be disassembled and a feeding and discharging Y shaft arranged on one side of the storage bin and used for moving the lenses in a tray out to a working area. The jacking and clamping double-station assembly comprises a clamping head for clamping a to-be-disassembled lens, a lead screw motor for ejecting out to-be-sorted components in the lens in the direction below the clamping head, a component pre-pressing plate piece for pre-pressing the products to prevent the products from scattering and inclining, and a pre-pressing mechanism switching shaft for adjusting the position of a pre-pressing mechanism. An inverted U-shaped support plate is arranged on the top surface of the free end of the component pre-pressing plate piece, the inner wall of the U-shaped support plate is connected with a vacuum chuck tailstock through a lifting component, the bottom surface of the vacuum chuck tailstock is connected with a vacuum chuck piece through a pipeline longitudinally penetrating through the component pre-pressing plate piece, and the vacuum chuck piece adsorbs a component in a lens in a product.

The invention relates to a preparation method of a gel electrolyte with an efficient flame-retardant characteristic. The gel electrolyte is mainly composed of a gel matrix, a flame retardant and an electrolyte solution. The invention provides a method for preparing a flame-retardant gel electrolyte, and application of the flame-retardant gel electrolyte in energy storage equipment such as a lithium ion battery is described in detail. The flame-retardant gel electrolyte has excellent flame retardance, and the safety performance of a battery system can be effectively improved. The preparation method comprises the following specific synthesis steps: (1) firstly, mixing polyethylene oxide (PEO) with a solvent, then adding lithium hexafluorophosphate (LiPF6) electrolyte salt, and uniformly stirring to form a uniform solution; and (2) adding trifluoroethyl methacrylate and a PEGDMA initiator into the solution, carrying out polymerization reaction to form a composite skeleton, and infiltrating the electrolyte under the swelling action to finally form the gel electrolyte. And (3) drying the swelled gel electrolyte to remove redundant solvent and moisture, and then cutting and packaging to obtain the gel electrolyte with high flame retardance. The flame retardance of the electrolyte is remarkably improved by reducing the using amount of the electrolyte and polymerizing and curing the electrolyte.

The invention belongs to the technical field of industrial automation, and discloses an actuator calibration equipment mechanism which comprises a working panel, a main support is fixedly installed at the right end of the top of the working panel, a calibration assembly is movably installed on the front face of the upper portion of the main support, and a downward pressing air cylinder is fixedly installed at the top of the main support. The output end of the downward pressing air cylinder is connected with a calibration assembly, and a marking assembly is installed at the bottom end of the calibration assembly. Compared with a traditional manual calibration mode, the automatic actuator calibration system based on angle calibration has the advantages that the calibration efficiency is remarkably improved, the calibration accuracy is enhanced, the production flexibility and adaptability are improved, the calibration efficiency, accuracy, flexibility and safety are improved, and the automatic actuator calibration system based on angle calibration is suitable for popularization and application. And quality control and management are optimized, remarkable beneficial effects are brought to industrial automatic production, and the method is an important technical means for promoting industrial automatic upgrading.

The invention discloses a sulfur-resistant CO-resistant high-entropy intermetallic compound catalyst as well as a preparation method and application thereof. The catalyst is a Ni-Co-Cu-Fe-In-M high-entropy intermetallic compound catalyst obtained by loading a Ni-Co-Cu-Fe-In-M six-membered intermetallic compound on an aluminum-magnesium metal mixed oxide, wherein Ni, Co, Cu and Fe are active metals, In is an inert metal, and M is a sulfur-resistant metal and is selected from one of Zn, Mo and Ce; according to the catalyst, the structural characteristics of LDH are utilized, meanwhile, by means of the synergistic effect of multiple elements in the high-entropy intermetallic compound catalyst, the catalyst has excellent CO resistance, the sulfur resistance of the catalyst is remarkably improved by introducing the auxiliary element M, meanwhile, high conversion rate and high selectivity are taken into consideration, and the catalyst is suitable for industrial production. The technical bottleneck that the existing catalyst is insufficient in CO resistance and sulfur resistance is overcome, and a brand new thought is provided for industrial design of a green methanol synthesis catalyst.

The invention relates to a low-temperature graphite negative electrode material and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the prepared low-temperature graphite negative electrode material, firstly, the surface of graphite is pre-oxidized through potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid, and then under the action of sodium nitrate, potassium permanganate and hydrogen peroxide, graphite oxide is prepared; then, ammonium molybdate hydrate and thioacetamide are used as a molybdenum source and a sulfur source, graphite oxide is used as a supporting material, a molybdenum disulfide-graphite compound is synthesized, and the conductivity and the cycling stability are improved; secondly, the surface of the negative electrode is coated with amorphous resin carbon / nickel oxide, so that the ion diffusion efficiency of the low-temperature graphite negative electrode material is enhanced, and the electrochemical lithium storage performance is improved in a low-temperature environment; and finally, the surface of the amorphous resin carbon / nickel oxide is coated with a layer of polythiophene film, so that the rate capability of the negative electrode material is improved due to large surface area and high pores.

The invention discloses a preparation method of nano silver powder, which comprises the following steps: under a stirring condition, respectively dissolving silver nitrate, a complexing agent and a reducing agent in deionized water to respectively obtain a silver nitrate solution, a complexing agent solution and a reducing agent solution with the concentration of 150-400g / L, dropwise adding the complexing agent solution into the silver nitrate solution, and stirring to obtain a nano silver powder solution; the preparation method comprises the following steps: adding a reducing agent solution into a reaction kettle, reacting to obtain a silver complexing solution, dropwise adding the silver complexing solution into the reducing agent solution, reacting to generate a silver simple substance, and carrying out solid-liquid separation, washing and drying on the silver simple substance to obtain spherical nano silver powder; according to the preparation method, reaction is carried out in a water system, a high-molecular compound is not used as a dispersing agent, potassium borohydride, sodium borohydride and vitamin C are used as reducing agents to reduce the silver complex, the prepared silver powder is good in dispersing performance, particles are spherical, the purity is high, the sintering resistance is low, the preparation method is simple, and the yield of the silver powder is as high as 97% or above.

The utility model discloses a connecting end of a fluid connector and the fluid connector, and relates to the technical field of connectors. The connecting end comprises a connecting part and an operating part, the connecting part comprises a valve seat and a valve movably connected to the valve seat, the operating part is movably connected to the outer side of the valve seat, the valve is connected with the operating part through a control hole in the valve seat, and the operating part can drive the valve to move when moving so as to control opening and closing of a communicating channel in the valve seat. According to the connecting end, the operating part is arranged outside the valve seat, when the communicating channel needs to be opened and closed, a user can drive the operating part to drive the valve to act, the valve seat does not need to be directly driven, and therefore the communicating channel can be opened and closed more conveniently.

The invention provides a silicon carbon material with a multilayer coating structure and a preparation method and application thereof, and relates to the technical field of battery materials. The silicon-carbon material with the multi-layer coating structure comprises a porous carbon core body, and a first carbon layer and a second carbon layer which sequentially coat the porous carbon core body from inside to outside, and the porous carbon core body comprises porous carbon and nano silicon particles deposited on the surface and in pore channels of the porous carbon; and a conductive nano carbon filler is dispersed in the second carbon layer. The silicon carbon material with the multilayer coating structure provided by the invention is used as a lithium ion battery negative electrode material, and has excellent specific capacity, coulombic efficiency and cycle performance. The result of the embodiment shows that when the silicon carbon material with the multi-layer coating structure is applied to the lithium ion battery, the first reversible capacity is 1882-2071 mAh / g, the first coulombic efficiency is 92.6-94.1%, and the capacity retention ratio of 100 cycles is 95.3-97.7%.

The invention relates to the technical field of cutting fluids, and discloses a high-temperature alloy cutting fluid and a preparation method thereof, the high-temperature alloy cutting fluid comprises the following components: 30%-50% of base oil, 5%-10% of organic alkali, 5%-10% of an antirust agent, 4%-10% of synthetic ester, 15%-20% of an anti-wear reagent at extreme pressure, 0.5%-1.5% of a corrosion inhibitor, 7%-15% of an emulsifier, 2%-4% of a bactericide, 0.05%-0.1% of a defoaming agent, and the balance of water; the extreme pressure anti-wear agent is composed of a chlorination extreme pressure anti-wear agent and a vulcanization extreme pressure anti-wear agent. According to the invention, the ester-based base oil, the organic alkali, the synthetic ester and the extreme pressure anti-wear agent composed of the chlorination extreme pressure anti-wear agent and the vulcanization extreme pressure anti-wear agent are combined to form a continuous high-strength lubricating film, and the continuous high-strength lubricating film is compounded with additives such as the organic acid antirust agent, the corrosion inhibitor and the bactericide; therefore, the antirust corrosion inhibition performance of the cutting fluid on workpieces and machine tools and the long-term use safety and environmental protection performance are improved during processing.

The invention discloses a method for improving the efficiency of a perovskite solar cell, and belongs to the technical field of solar cells. The insulating spacer film prepared between the electron transport layer and the perovskite layer of the perovskite solar cell by adopting the electron beam evaporation method has high uniformity, the cell interface structure can be optimized, defects are reduced, charge recombination loss is reduced, and the photoelectric conversion efficiency and stability are effectively improved. The insulating spacer layer not only can block external moisture and pollutants, reduce direct contact between the perovskite layer and the electron transport layer and prolong the service life of the cell, but also can inhibit internal ion migration and slow down performance degradation. By accurately regulating and controlling the thickness of the insulating spacer layer, charge transmission optimization and compound loss minimization are realized. An innovative technical path is provided for research and development of efficient and stable perovskite solar cells, and further development of the solar cell technology is expected to be promoted.

The invention discloses a sample adjusting device for a microbiological detection analyzer, and relates to the technical field of microbiological detection analysis, the sample adjusting device comprises a device main body, an inner cavity of the device main body is fixedly connected with a fixing plate, the fixing plate is fixedly connected with a servo motor, an output shaft of the servo motor is fixedly connected with a rotating disc, and the rotating disc is fixedly connected with a rotating shaft of the rotating disc. A crank is rotationally connected to the rotating disc, a loading table is rotationally connected to the end, away from the rotating disc, of the crank, a guide rail is fixedly connected to an inner cavity of the device body, and a first sample tube and a second sample tube are arranged on the loading table; in the process that the test tube moves to the position below the first sample tube and the second sample tube, a piston rod of a piston barrel moves, detection liquid in a liquid storage barrel is dropped into the test tube, meanwhile, the dropping quantity of the detection liquid can be adjusted and controlled, errors caused by different persons in manual operation are avoided, and the detection accuracy is improved. In addition, direct contact between operators and reagents and samples is reduced in the automatic process, and the risks of cross contamination and environmental pollution are avoided.

The invention discloses a low-cost zero-strain high-capacity fast-charging porous silicon carbon negative electrode material as well as a preparation method and application thereof, and belongs to the field of energy storage. According to the method, a spherical plant-based biomass material is used as a raw material, and is compounded with a high-molecular polymer and a molten salt pore-forming agent to prepare the spherical interconnected hierarchical porous carbon material. In the high-temperature carbonization and pore-forming process of the molten salt, part of metal compounds are subjected to carbothermal reduction to form metal elementary substances, the metal elementary substances serve as active sites for silanization gas, and catalytic reduction growth of superfine silicon nanoparticles is carried out in pores of the interconnected hierarchical porous spherical carbon in a uniformly dispersed manner. The hierarchical interconnected pore structure of the obtained material can relieve volume expansion in the charge-discharge process, optimize electron density distribution and promote charge transfer, so that the conductivity and ion transmission rate of a final product are improved; the dispersed superfine silicon nanoparticles enable the prepared silicon carbon negative electrode to have zero strain, high capacity, fast charging performance and excellent cycling stability, so that the silicon carbon negative electrode becomes a potential ideal material of silicon carbon.

The invention discloses a flame-retardant modified PVC (polyvinyl chloride) composite material based on graphene-coated hydroxyl magnesium-aluminum hydrotalcite LDHs (layered double hydroxides) and a preparation method of the flame-retardant modified PVC composite material. The method comprises the following steps: S1, preparing hydrotalcite-based filler based on graphene-coated hydroxyl magnesium-aluminum hydrotalcite LDHs: S1-1, preparing graphene oxide GO; s1-2, preparing reduced graphene oxide r-GO; s1-3, preparing a hydrotalcite-based filler by a one-pot method; s2, loading a flame retardant on the hydrotalcite-based filler through an impregnation method to obtain a flame-retardant modified filler; s3, coating the flame-retardant modified filler with a polymer to obtain a composite modified filler; s4, mixing the composite modified filler, a stabilizer, a plasticizer and PVC to obtain the flame-retardant modified PVC composite material. The PVC composite material provided by the invention has excellent mechanical strength and thermal stability, and also has excellent flame retardant property and smoke suppression effect.

The invention provides a multipurpose and multifunctional composite brush disc, and belongs to the technical field of ocean ship industry. The multifunctional composite brush disc is installed on a certain carrier through a flange installation piece so as to brush a target object, and the multifunctional composite brush disc specifically comprises a motor assembly, a brush assembly and a blade assembly. The motor assembly passes through an output shaft, the brushing assembly is fixedly connected to the output shaft, and the output shaft drives the brushing assembly to rotate; the blade assemblies can be arranged in different numbers according to requirements and are evenly welded to the upper portion of the cleaning and brushing assembly. After the control module controls the driving motor to start, the high-pressure water valve is opened, the brush disc rotates to drive the brush wires and the blade assembly to rotate, and high-pressure water flow can effectively wash and strip substances such as seaweed and silt attached to the surface of a ship body; the blade assembly can effectively cut off shellfish organisms attached to the surface of the ship body; shallow substances such as dirt on the surface of the ship body are brushed through the bristles. Three brushing schemes of high-pressure water, blade cutting and bristle brushing are integrated, and different substances attached to the surface of the ship body can be effectively brushed.

The invention relates to the technical field of ore sample preparation, in particular to an automatic quartz ore chemical analysis sample preparation device which comprises a material table, a sampling table is fixedly arranged on the side wall of the material table, a feeding hopper is fixedly arranged on the front wall of the sampling table, the lower end of the feeding hopper is communicated with a crushing assembly, and a crushing box is arranged on the crushing assembly; a grinding assembly is fixedly arranged on the bottom face of the crushing box, a grinding box is arranged on the grinding assembly, a screening assembly is fixedly arranged on the bottom face of the grinding box, a hollow screening box is arranged on the screening assembly, and a discharging frame is fixedly arranged on the bottom face of the hollow screening box. According to the invention, the crushed ore particles are more uniform, the existence of large ore blocks is reduced, the crushing quality is improved, the continuity and stability of the crushing process are ensured, the grinding effect is improved, the ground quartz ore particles are more uniform and fine, and the graded screening of the ore particles is facilitated; and rapid sample preparation of automatic quartz ore chemical analysis is realized.

The invention relates to the technical field of lithium batteries, and discloses a silicon-based composite negative electrode material and a preparation method thereof, a lithium ion battery negative electrode plate and a lithium ion battery. The negative electrode material comprises a matrix, a carbon layer coated on the outer surface of the matrix and a graphene oxide sheet layer coated outside the carbon layer, the substrate is a silicon oxide SiOx, and 0 lt; xlt; 2; the weight ratio of the matrix to the carbon layer to the graphene oxide sheet layer is 1: (0.1-0.2): (0.2-0.3). The silicon oxide SiOx is coated on the substrate by the carbon layer, so that the direct contact between the substrate and an electrolyte can be reduced, the probability of side reaction can be reduced, the formation of a stable SEI interface and a graphene oxide sheet layer is facilitated, and the conductivity and cycling stability of the silicon-based composite negative electrode material can be improved; meanwhile, the lithium ion battery containing the silicon-based composite negative electrode material has a relatively low expansion rate, and the first-cycle coulombic efficiency and the cycle stability of the battery can be effectively improved.

The invention relates to the field of aqueous zinc ion batteries, in particular to a preparation method and application of copper phosphate for inhibiting zinc dendritic crystal growth, which adopts a hydrothermal reaction method to construct a copper phosphate (CP) protective layer on the surface of a zinc anode in situ, so that more zinc-loving sites are provided, Zn < 2 + > is uniformly deposited on the anode, and the zinc dendritic crystal growth is inhibited. The Cu3 (PO4) 2 cathode prepared by the method has the advantages that the'point effect 'caused by non-uniform deposition of Zn < 2 + > is effectively reduced, the hydrophobicity of the anode side is improved, the direct contact between water and zinc in electrolyte is reduced, the hydrogen evolution and the formation of a by-product Zn4 (OH) 6SO4. XH2O are effectively reduced, and the prepared Cu3 (PO4) 2 cathode has the service life of 2000 hours compared with a pure zinc cathode (110 hours) in the test of an assembled symmetrical battery, and has the advantages of high efficiency, high safety and the like. And compared with a pure zinc negative electrode (38.69%), the total battery assembled with the MnO2 negative electrode has higher capacity retention rate (more than 66%) and longer service life (more than 3000 weeks).

The positioning device comprises a landfill base and the electric pole, a shell is arranged outside the landfill base, a pole inlet is formed in the upper side of the shell, the electric pole is inserted into the landfill base through the pole inlet, a bottom support is arranged in the middle of the shell, an annular cylinder is arranged on the upper side of the bottom support, and a fixing device is arranged on the annular cylinder. The bottom of the electric pole is placed in the annular cylinder, a connecting table is arranged on the outer side of the bottom support in a surrounding mode, a vertical plate is fixedly arranged on the upper side of the connecting table, a clamping block is arranged in the vertical plate, the connecting table is connected with a base through a limiting plate, and a reset spring is arranged between the base and the connecting table. According to the device, the phenomenon that the electric pole is pulled up and shifted due to soil frost heaving, unfreezing or the wind power effect is effectively prevented, and the continuity and safety of power transmission are ensured.

The invention provides an environment-friendly low-sulfur diesel oil anti-wear agent, a preparation method and application thereof and a low-sulfur diesel oil anti-wear agent composition, and belongs to the technical field of anti-wear agents. The environment-friendly low-sulfur diesel oil anti-wear agent has a structure shown in the specification. The environment-friendly low-sulfur diesel oil anti-wear agent prepared by the invention has the advantages of excellent anti-wear performance, low acidity, small influence on the use performance of diesel oil, such as corrosivity, combustion performance, total acid value, oxidation stability and the like, capability of improving the oxidation resistance of the diesel oil, compatibility with engine oil, no increase of carbon deposit in an engine, and wide application prospect. # imgabs0 #

The invention provides an aqueous zinc ion electrolyte additive containing maltitol and application thereof, belonging to the technical field of aqueous batteries. The additive is maltitol. In the process of zinc deposition, maltitol molecules can be preferentially attached to the surface of a zinc metal anode through chemical adsorption, reducing the direct contact between free water and the zinc metal surface, thereby reducing the hydrogen evolution reaction between free water and the zinc metal surface, and inhibiting the generation of byproduct sulfate. In addition, a zinc ion battery containing maltitol can generate a larger nucleation overpotential, which can promote the formation of a finer grain zinc deposition layer, and also lead to an increase in nucleation sites and a decrease in nucleation speed, thereby inhibiting the growth of zinc dendrites, which helps the uniform deposition of zinc ions on the surface of the zinc metal anode.

The utility model discloses a motor rotating speed and torque testing mechanism, and relates to the technical field of motor testing equipment. The first mounting rack is mounted at the top of the test bench; the beneficial effects of the utility model are that the test bench, the supporting bottom plate and the auxiliary supporting assembly are arranged, when the test bench is used, the supporting bottom plate is aligned with the bottom of the test bench for installation, and the positioning bolts are placed in the test bench through the first limiting grooves; the outer side of the output end of the test motor is sleeved with a connecting shaft sleeve, the connecting shaft sleeve is sequentially matched with a limiting base and a rotating shaft installation cylinder to be connected with a limiting disc, and the stability of the limiting base during installation is improved through operation of the test motor and rotation speed and torque detection of the test motor. The installation stability of the rotating shaft installation cylinder is improved by installing the second installation frame, and the installation stability of the test motor is improved by installing the first installation frame and the supporting table, so that the test motor is matched with normal detection for use.

The invention relates to a negative electrode material and a battery, the negative electrode material comprises an inner core and a coating layer located on at least part of the surface of the inner core, the inner core comprises a silicon material and a filling agent, the filling agent is distributed in the silicon material, the filling agent comprises a carbon material and metal nanoparticles, and the carbon material and the metal nanoparticles are distributed in the silicon material. The coating layer comprises a first layer and a second layer which are arranged in sequence, the first layer is distributed on at least part of the surface of the inner core, and the first layer comprises a carbon layer and metal nanowires distributed on the carbon layer; the second layer is distributed on at least part of the surface of the first layer. The negative electrode material provided by the invention can effectively inhibit the volume expansion of silicon, improve the electron transmission efficiency and ion transmission efficiency of the negative electrode material, and improve the cycle retention rate of the negative electrode material.

The invention relates to the technical field of anti-counterfeiting films, and in particular to a multi-layer composite anti-counterfeiting film and a preparation method thereof. The invention uses styrene, n-butyl acrylate, methacrylic acid and allyl methacrylate as raw materials, and adopts a semi-stepwise emulsion polymerization method to prepare a colloidal microsphere component having excellent structural stability and dispersibility. In the process of preparing a photonic crystal film with the colloidal microsphere component, perovskite quantum dots are added, and the perovskite quantum dots can be embedded in the photonic crystal film formed by the colloidal microspheres, so that the periodic structure of the photonic crystal interacts with the fluorescence characteristics of the perovskite quantum dots, thereby leading to fluorescence enhancement; secondly, the colloidal microspheres serve as a protective layer, wrapping the perovskite quantum dots inside, reducing direct contact between the quantum dots and the external environment, thereby reducing the erosion of the quantum dots by factors such as water, oxygen, light and heat, improving the stability of the quantum dots, and preventing the agglomeration of the perovskite quantum dots, which helps to maintain their optical properties.

The invention provides a rapid in-situ monitoring system for VOCs pollution in underground water and soil gas of a polluted site, and belongs to the technical field of environment monitoring. Comprising a first collection module for collecting VOCs samples in underground water, a second collection module for collecting VOCs samples in soil gas, a collection module connected with the first collection module and the second collection module, an analysis monitoring module connected with the collection module, and a central processing module. VOCs samples in underground water are collected through the first collection module, VOCs samples in soil gas are collected through the second collection module, the collected VOCs samples are collected and stored through the collection module, the concentration and components of the VOCs samples in the collection module are monitored through the analysis monitoring module, and the whole system is arranged near a polluted site. And rapid in-situ monitoring of VOCs pollution in underground water and soil gas of a polluted site can be realized.

The invention discloses an intelligent mouse auxiliary control method and device, electronic equipment and a storage medium, and belongs to the technical field of man-machine interaction. According to the method, by means of the computer vision technology, the action of the face of a user is captured in real time, the position of a mouse pointer is accurately calculated, and the user can achieve efficient and visual mouse control through natural movement of the face; meanwhile, due to the introduction of the Bluetooth control ring, the user can send a control signal through simple touch operation, specific operations such as clicking and dragging of the mouse are realized, and the convenience and efficiency of the operation are remarkably improved. The method is equivalent to a traditional mouse in operation precision and intuition, and the learning cost of a user is remarkably reduced. In the aspect of privacy protection, the method only depends on face key points and Bluetooth to control signals of the ring, voice information of a user is not involved, and privacy leakage is effectively prevented. According to the invention, brand new interaction experience can be brought to the user, and a new thought is provided for the development of a future man-machine interaction technology.