56results about How to "Form evenly" patented technology

The invention discloses a method for preparing a composite iron-based polyanion positive electrode material. The structural formula of the positive electrode material is represented as Na4Fe3 (PO4) 2 (P2O7) (at) Camp, mXenes are sodium ferric pyrophosphate compositely coated by an MXenes material and a carbonaceous precursor, and the preparation method comprises the following steps: weighing a sodium source, a ferrous source, a phosphorus source and a carbon source according to a stoichiometric ratio, uniformly mixing, grinding, spray-drying and sintering at high temperature to obtain the composite iron-based polyanion positive electrode material, and the carbon source comprises iron-nickel doped polyethylene glycol. The composite iron-based polyanion positive electrode material provided by the invention is remarkably improved in the aspects of energy density, rate capability and cycle life, and the preparation process is simple to operate, reliable in flow, quick in preparation process and easy for industrial production, so that an ideal scheme is provided for commercialized sodium ion battery positive electrode materials.

The invention provides a method for improving coercive force of a neodymium-iron-boron magnet through power ultrasonic treatment, and belongs to the field of magnets. According to the method for improving the coercive force of the neodymium-iron-boron magnet through power ultrasonic treatment, in the heat preservation process of heat treatment of the neodymium-iron-boron sintered magnet, contact type introduction power ultrasonic treatment is carried out; the method for improving the coercive force of the neodymium-iron-boron magnet through power ultrasonic treatment comprises the steps that a neodymium-iron-boron sintered magnet is sequentially subjected to first heat treatment, second heat treatment and third heat treatment, and the high-coercive-force neodymium-iron-boron magnet is obtained; in the heat preservation process of at least one time of heat treatment in the first heat treatment, the second heat treatment and the third heat treatment, contact type introduction power ultrasonic treatment is carried out. According to the method for improving the coercive force of the neodymium-iron-boron magnet through power ultrasonic treatment, the volume ratio of a rare earth-rich phase (alpha (RE)) in a grain boundary structure of the neodymium-iron-boron magnet can be obviously increased, and the coercive force of the neodymium-iron-boron magnet can be further improved.

The embodiment of the invention relates to a composite metal lithium negative plate, a preparation method thereof and a lithium battery. The composite metal lithium negative electrode plate comprises a negative electrode current collector and a composite metal lithium negative electrode material; the composite metal lithium negative electrode material is obtained by drying blended slurry of a metal lithium solution, a conductive material, a binder and a lithium-philic compound, the blending slurry is coated on the negative electrode current collector; according to the composite metal lithium negative electrode plate, the lithium-loving compound is used as a lithium element nucleation site, and the lithium-loving compound and the metal lithium solution are combined to generate a synergistic effect to form a uniform negative electrode material, so that lithium ions are uniformly embedded and deembedded in the charging and discharging processes; therefore, formation of lithium dendrites on the surface of the composite metal lithium negative electrode material is inhibited.

The invention discloses a purification method and a purification device for crystallized magnesium, and relates to the field of magnesium metal smelting. The method comprises the following steps: under the protection of an inert atmosphere, firstly carrying out pressure-applying melting treatment on a magnesium material to be smelted, and then carrying out pressure-applying filtering treatment on a product obtained after the melting treatment, so as to complete the flux-free smelting process of the magnesium material. And meanwhile, the metal magnesium liquid and most of the oxide shells are separated by utilizing the liquidity difference between the liquid metal magnesium and the solid oxide shells. Compared with a conventional smelting process without pressure application, the method has the advantages that the melting rate of the crystallized magnesium can be remarkably increased, most of oxide impurities are removed, a series of pollution problems caused by flux use are solved from the source, and low-cost, high-efficiency and high-quality smelting of the crystallized magnesium is realized.

The invention provides a method for improving the emulsibility of soybean milk, which comprises the following steps: placing soybean milk in a composite electromagnetic field which comprises an alternating electric field and a rotating magnetic field which are superposed; wherein the excitation voltage of the applied alternating electric field is 400-700 V, the frequency of the applied alternating electric field is 400-500 Hz, the magnetic field intensity of the applied rotating magnetic field is 8-12 mT, the frequency of the applied rotating magnetic field is 5-10 Hz, and the direction of the alternating electric field is perpendicular to the direction of the rotating magnetic field, so that the composite electromagnetic field is formed through superposition. An induced electric field and an induced current formed in the soybean milk by the applied alternating electric field can change the polarity environment of the soybean milk and inhibit protein in the soybean milk from being condensed into macromolecular agglomerates, and the applied rotating magnetic field can enable the protein to be uniformly dispersed in the soybean milk, so that the emulsibility of the soybean milk is improved; the soybean milk treated by the method is finer and softer in taste, and the quality is improved.

The food safety detection equipment disclosed by the invention comprises a sampling mechanism, a multi-station turntable device, a centrifugal device, a conveying mechanism, a detection device, a reagent adding device and an extraction mechanism. The sampling mechanism is provided with a sampling table; the multi-station turntable device is provided with a first containing part; the centrifugal device comprises a rotating frame and a first driving mechanism, and the rotating frame is provided with a second containing part; the first conveying mechanism is used for transferring the sample containers among the sampling mechanism, the multi-station turntable device and the centrifugal device; the detection device is provided with a third containing part, a fourth containing part, a first image acquisition device and a second image acquisition device; the reagent adding device is used for adding reagents to form a first sample and a second sample; the extraction mechanism comprises a manipulator and a pipette and is used for extracting the first sample and the second sample. The device has the advantages of high automation degree, good soaking and purifying effects, high detection precision and integration of multiple detection means.

The invention belongs to the field of silicon carbide powder synthesis, and particularly relates to a silicon carbide powder synthesis crucible and a use method. The silicon carbide powder synthetic crucible is formed by vertically stacking single-layer crucibles with the same structure along the central axis of a graphite crucible; the single-layer crucible comprises a crucible upper cover, a graphite sheet and a crucible main body; the crucible upper cover and the crucible main body are nested; the bottom of the inner cavity of the crucible main body is used for placing silicon powder and graphite powder; and the graphite flake is clamped between the crucible upper cover and the crucible main body. By designing the height of the single-layer crucible and the structure of the multi-layer crucible, a proper temperature gradient is favorably constructed, and by controlling parameters such as heat preservation time and pressure, batch production of large-particle-size and high-uniformity silicon carbide powder is realized, and an ideal raw material is provided for growth of high-quality silicon carbide crystals.

The invention discloses a welding device and a welding method based on electromechanical maintenance, and belongs to the technical field of welding, the welding device comprises a mounting shell and a telescopic welding module, a control machine is fixedly mounted on the outer wall of one side of the mounting shell, a base is fixedly mounted at the bottom of the mounting shell, and the telescopic welding module is arranged on the outer wall of one side of the control machine; an adjusting motor is fixedly mounted on the top surface of the mounting shell; the upper mounting mechanism and the lower mounting mechanism are arranged in a matched mode, through the design, mounting and positioning of a weldment can be rapidly completed, the weldment mounting efficiency is improved, meanwhile, the positioning structure facilitates appearance protection of the weldment, the appearance of the weldment cannot be damaged when the weldment is positioned, and the welding quality is improved. And meanwhile, all-directional welding changing treatment of the weldment can be achieved, dead-corner-free welding of the weldment can be achieved, the welding effect is improved, welding comprehensiveness is guaranteed, and the actual application effect of equipment is improved.

The utility model discloses a plating bath device for improving deep plating ability, which comprises a plating bath body, guide rail assemblies, an anode assembly, a cathode assembly and a bath solution circulating device, the guide rail assemblies are fixedly connected to the edges of the two sides of the upper end of the plating bath body respectively, and an adjusting assembly is fixedly mounted between the two guide rail assemblies. The adjusting assembly is slidably connected in the plating tank body, an anode assembly is fixedly connected to the adjusting assembly, the anode assembly is composed of a plurality of anode plates, a cathode assembly is arranged on the inner wall, opposite to the anode assembly, of the plating tank body, and tank liquid circulating devices are connected to the two sides of the plating tank body. The utility model aims to provide the electroplating bath device which is good in electroplating effect, high in working efficiency and strong in applicability.

The invention provides an oligomeric micromolecule donor compound as well as a preparation method and application thereof. The oligomeric small molecule donor compound belongs to a brand-new long conjugate organic small molecule donor material containing a connecting unit, two or more efficient organic small molecule donors are combined into a whole, the conjugate length is prolonged, and a series of novel oligomeric small molecule donor materials are synthesized. The oligomeric small molecule donor compound disclosed by the invention has good batch repeatability and relatively good film-forming property; the oligomeric small molecule donor compound prolongs the conjugate length, has excellent ultraviolet-visible light absorption performance, has strong interaction and aggregation among molecules, can realize good phase separation from a non-fullerene receptor, has a proper electron energy level, and is suitable for being used as an electron donor material in an organic solar cell.

The invention belongs to the technical field of warm-keeping clothes, and discloses a down filling parting strip, a down filling layer structure and a warm-keeping clothes manufacturing method. The down filling parting strip comprises a separating part, a first attaching part and a second attaching part, the first attaching part is sewed at one end of the separating part, the first attaching part is provided with a first attaching face, and the first attaching face is used for being bonded with fabric; the second fitting part is sewed at the other end of the separation part and is provided with a second fitting surface, and the second fitting surface is used for being bonded with the lining; the down filling layer structure comprises a fabric, a lining, a filler and a first partition assembly, wherein the first partition assembly comprises a plurality of down filling partition strips. The down-filled parting strip does not need to be sewn with a lining and a fabric through quilting lines, so that needle holes cannot be formed in the lining and the fabric, the condition of down running is avoided to a great extent, and meanwhile, the tear resistance of clothes is improved through the needle-hole-free structure.

The invention relates to the technical field of cable trench soil construction equipment, in particular to tamping equipment for cable trench backfill, which comprises a machine body and telescopic drivers symmetrically arranged on two sides of the machine body, the other ends of the telescopic drivers are fixedly connected with a soil shoveling assembly, and the machine body is sequentially provided with a crushing assembly, a leveling assembly and a soil ramming assembly from front to back. One end of the telescopic transmission machine is movably connected with the machine body; the soil shoveling assembly comprises a rotatably arranged soil feeding mechanism, and the telescopic driver adjusts the distance between the soil shoveling assembly and the machine body through the action of a lead screw nut mechanism; the crushing assembly comprises two groups of parallel soil crushing pieces, the two groups of soil crushing pieces synchronously rotate in opposite directions, the soil ramming assembly comprises a rotating piece and four soil ramming units arranged in the circumferential direction of the rotating piece at intervals, and the four soil ramming units are matched with the rotating piece to sequentially reciprocate; according to the invention, backfilling and tamping can be synchronously carried out, the cable trench backfilling construction efficiency is improved, the backfilling is compact, and the labor intensity of workers is reduced.

This invention relates to a processing method for soft and tender abalone with a soft, glutinous texture, comprising the following steps: S1, pre-treating fresh abalone to obtain pre-treated abalone meat; S2, placing the pre-treated abalone meat under hot air conditions, first heating it to a first temperature and holding it at that temperature, then raising the temperature to a second temperature and holding it at that temperature, to obtain enzyme-inactivated abalone meat; the first temperature does not exceed 55°C, and the second temperature is at least 10°C higher than the first temperature; S3, enzymatically hydrolyzing the enzyme-inactivated abalone meat with a protease, and after inspection and packaging, obtaining soft and glutinous abalone with a soft, glutinous texture. This invention, through gradient temperature inactivation of enzymes and three-parameter synergistic regulation of enzymatic hydrolysis, produces soft and glutinous abalone with a sticky adductor muscle adhesiveness >25N, a soft, glutinous texture uniformity >90%, and a 100% success rate in achieving the desired soft and glutinous texture. The method of this invention is simple and can achieve large-scale and continuous production. It is suitable for the industrial processing of high-end ready-to-eat soft-boiled abalone, pre-cooked soft-boiled abalone, and other products, significantly improving the added value and market competitiveness of abalone products.

This invention belongs to the field of membrane separation technology, specifically relating to a method for preparing a polytetrafluoroethylene (PTFE) composite membrane. The preparation method includes: (1) dissolving a spinning aid, a barium source, a titanium source, and a manganese source in a composite solvent, and then electrospinning to obtain precursor fibers; subsequently, blending the precursor fibers with a grain refiner, and heat-treating to obtain doped ferroelectric fiber bundles; (2) further polymerizing organic acids, inorganic acids, conductive fillers, and conductive polymers with monomers and oxidants to finally obtain a conductive polyaniline composite; (3) incorporating Mxene and the conductive polyaniline composite into an aqueous PTFE emulsion, and then further incorporating the doped ferroelectric fiber bundles and stirring to obtain a suspension; the suspension is then coated, post-treated, and kept warm to obtain a PTFE composite membrane. This invention improves the long-term fouling resistance of the PTFE membrane by doping the doped ferroelectric fiber bundles, the conductive polyaniline composite, Mxene, and PTFE.

This invention relates to the field of physical similarity simulation technology, specifically providing a physical simulation method for the formation process of lunar lava tube structures. The method involves preparing a simulated melt that meets the rheological and thermodynamic similarity criteria of basaltic lava by mixing thermoplastic materials with condensation additives. The low-gravity effect, high-vacuum environment, and radiative cooling conditions under lunar conditions are reproduced using inclined flow channels and thermal vacuum cavities. By precisely matching dimensionless parameters such as Peckley number, dimensional temperature, and Rayleigh number, the injection rate, flow channel inclination angle, and target ambient temperature of the simulated melt are determined. Under these conditions, controlled melt flow and surface solidification crust formation are simulated, ultimately forming a cavity structure model. This allows for the physical study of the formation process of lunar lava tube structures. This invention can accurately reproduce the dynamic crust formation and cavity formation process of lava flow under extreme lunar conditions, providing a quantitative experimental data basis for the study of the formation mechanism of lunar lava tubes and their engineering applications.

The application discloses a microfluidic chip for preparing high-flux tumor organoids and a preparation method and application thereof. The microfluidic chip comprises a top layer and a matched bottom layer connected with the top layer; the top layer contains four hollow areas in the shape of right-angle sectors, and forms liquid storage areas after being connected with the bottom layer; four cell culture areas and four liquid exchange buffer areas are arranged in the areas of the bottom layer corresponding to the hollow areas of the top layer, and one cell culture area and one liquid exchange buffer area form a right-angle sector; the cell culture area is provided with a plurality of small chambers; and the liquid exchange buffer area is connected with the center. The microfluidic chip is provided with the liquid exchange buffer area, which greatly reduces the growth interference and loss of cells during liquid exchange, thereby being beneficial to the formation of uniform tumor organoids and keeping the tumor organoids in situ, facilitating continuous observation; and the top-open structure design is adopted, which is convenient for uniform implantation and dispersion of tumor cells and convenient for recovery of the tumor organoids.

The utility model discloses a fixture for loading a blade. The fixture comprises a mounting seat and a clamping mechanism, mounting holes are respectively formed in the front and rear ends of the right side surface of the mounting seat; the clamping mechanism comprises a turntable, clamping plates, an anti-skid groove and a rotating shaft, the rotating shaft is rotationally connected to the middle of the mounting base, the left end of the rotating shaft is fixedly connected with the turntable, a sliding groove is formed in the left side face of the turntable, and the clamping plates are slidably connected to the front end and the rear end of the inner wall of the sliding groove correspondingly; the clamping mechanism comprises two clamping plates, anti-skid grooves which are evenly distributed are formed in the opposite inner side faces of the two clamping plates, a clamp is arranged between the two clamping plates, the clamping mechanism further comprises guide sliding grooves, gears, rack plates and rotating shafts, and the guide sliding grooves are formed in the inner walls of the upper ends and the lower ends of the sliding grooves. The revolution of the blade fixed on the clamp is realized, so that more uniform formation of a coating is facilitated, the condition of non-uniform thickness or coating missing is avoided, and the coverage rate and the uniformity are improved.

The invention provides a preparation and analysis method of a hot-dip Zn-Al-Mg alloy coating, and belongs to the technical field of metal surface coating. The preparation method comprises the steps of steel strip pretreatment, hot dipping and post-plating treatment, and an alloy plating layer with a uniform structure is obtained by controlling parameters of all working procedures; the invention also provides a matched coating analysis method which comprises the following steps: performing phase analysis by adopting an X-ray diffractometer, and performing quantitative characterization on the microscopic structure of the coating by adopting a scanning electron microscope in combination with image analysis software. The corrosion resistance of the coating is remarkably improved by increasing the content of Al and cooperatively adding Mg and Si, the microstructure characteristics of the coating are revealed through analysis, a theoretical basis is provided for component optimization and process control, and industrial application prospects are achieved.

The invention discloses a preparation method of a manganese cerium oxide catalyst for a low-temperature NH3-SCR (Selective Catalytic Reduction) reaction, MnCeOx catalysts with different Ce / Mn ratios are prepared by taking metal Mn modified Ce-UiO-66 as a precursor through high-temperature pyrolysis in an N2 atmosphere and oxidation in a muffle furnace, and the MnCeOx catalysts are used in the low-temperature NH3-SCR denitration reaction. Preferably, in the NH3-SCR reaction, when the air speed is 200000h <-1 >, the conversion rate of NOx in the temperature range of 140-230 DEG C reaches 80% or above when the ratio of Ce to Mn is 1: 2; and compared with single metal oxide CeO2, the catalytic activity is obviously improved. The specific surface area of the MnCeOx catalyst prepared in the invention is increased, the reducibility is enhanced, the interaction between manganese and cerium promotes the formation of oxygen vacancies, and the NH3-SCR catalytic activity of the catalyst is improved.

The embodiment of the present application discloses an electrochemical device and an electronic device, including a housing, a first electrode assembly, a second electrode assembly, and an isolating member, wherein the isolating member is disposed between the first electrode assembly and the second electrode assembly, and the first electrode assembly, the isolating member, and the second electrode assembly are disposed sequentially along a first direction. The housing is provided with a first cavity and a second cavity; the first electrode assembly includes a first pole piece assembly received in the first cavity; the second electrode assembly includes a second pole piece assembly received in the second cavity. Along the first direction, the area of ​​the first projection of the first pole piece assembly on the isolating member is S 1 , the area of ​​the second projection of the second pole piece assembly on the isolation member is S 2 , the area of ​​the overlap between the first projection and the second projection is S 3 , satisfying S 3 / S 1 ≥0.9, S 3 / S 2 ≥0.9. At this time, it is beneficial to improve the safety of the electrochemical device.

The invention discloses a surface corrosion-resistant water-based back paint for alloy substrates and a preparation method thereof, belonging to the technical field of water-based back paint processing, and used to solve the technical problems that weak interface exists in the paint film of the water-based back paint in the prior art, a large number of bubbles are easily formed on the surface of the water-based paint film when the water-based back paint is coated and formed, and the impact resistance, surface corrosion resistance and durability of the paint film need to be further improved; the surface corrosion-resistant water-based back paint for alloy substrates is composed of modified polyester, modified drier, composite iron red, water and additives, and has a viscosity of 5500-6500 MPa·s; the modified polyester is prepared into modified castor oil rich in carboxyl groups by dehydration condensation of ricinoleic acid glyceride and phthalic anhydride; the invention not only effectively improves the impact resistance, salt spray resistance and wear resistance of the water-based back paint film, but also reduces the bubbling performance of the water-based back paint, and improves the flatness of the paint film surface.

The invention discloses a protection device for mining machinery welding, and relates to the technical field of machinery welding protection, the protection device comprises a handle and a gun body, one end of the handle is fixedly connected with the gun body, the inner side of the gun body is in threaded connection with a connecting body, and the inner side of the connecting body is fixedly connected with a tungsten needle clamping pipe; a tungsten needle is fixedly connected to the inner side of the tungsten needle clamping pipe, a gas compensation mechanism is arranged on the outer side of the gun body, a nozzle is arranged at the bottom of the gas compensation mechanism, the nozzle is arranged on the outer side of the tungsten needle, a reset mechanism is arranged on the inner side of the nozzle, and the gas compensation mechanism is arranged. The mechanism can drive the nozzle to generate an offset towards the blowing direction (namely the windward direction) of wind; a hedging angle is formed between the ejection axis of the protective gas and the wind direction, so that gas loss caused by wind drift is actively compensated; and finally, wrapping type stable covering of the protective air curtain on the welding area is achieved, and the welding quality is ensured.

The invention discloses a linear bearing lubricating structure, and relates to the technical field of bearing assemblies. A linear bearing lubricating structure comprises a retainer, a fixing seat is arranged outside the retainer in a sleeving mode, sealing pieces are installed at the two ends of the retainer, an oil storage box is arranged on the annular portion of the periphery of the retainer, an oil storage cavity is formed in the oil storage box, and the linear bearing lubricating structure further comprises an oil groove formed in the inner wall of the bottom of the oil storage box; the oil tank and the balls are arranged in the oil storage box, the oil tank can play a role in guiding and buffering when lubricating oil flows, so that an oil film is more uniformly and stably formed at a bent part, the situation that the oil film is broken or unstable due to disordered oil flowing is reduced, lubrication is better achieved, and the service life of the oil storage box is prolonged. Meanwhile, the balls distributed at equal intervals can uniformly disperse the load borne by the bearing, so that overlarge local pressure is avoided, the overall bearing capacity of the bearing is enhanced, and the bearing can adapt to higher load and worse working conditions.

The utility model relates to the technical field of shoe soles, and discloses an integrated shoe sole with a moxa fragrance sterilization function. The utility model aims to solve the technical problems that in the prior art, the antibacterial and deodorizing effects are poor, the growth of bacteria and fungi in shoes is difficult to effectively inhibit, the environment in the shoes is humid and stuffy, peculiar smell is easy to generate, and the comfort and health of a wearer are influenced. A shoe sole sequentially comprises an upper breathable layer, a middle wormwood sterilization layer and a bottom anti-skid layer from top to bottom. The middle wormwood sterilizing layer comprises a plurality of wormwood microcapsules; the bottom anti-skid layer comprises a toe cap and a shoe tail which are made of PU materials and integrally formed, the toe cap comprises an arc-shaped protection head, a first anti-skid structure is arranged at the bottom of the toe cap, and a second anti-skid structure is arranged at the bottom of the shoe tail. According to the utility model, multiple functions of wormwood sterilization, ventilation, skid resistance and the like are integrated, so that the sanitary environment, the comfort and the walking safety of a wearer are improved, and energy recycling is realized.

The invention discloses a split type magnetic liquid sealing device in the technical field of mechanical engineering sealing, which comprises a bottom plate, a through hole is formed in the center of the bottom plate, a rotating shaft is arranged in the through hole, the upper part of the rotating shaft is rotatably sleeved with a turntable, a magnetic beam groove with an upward opening is formed in the bottom plate on the periphery of the through hole, and a magnetic conducting ring is fixedly connected in the magnetic beam groove; a plurality of permanent magnets are fixedly connected into the magnetic conductive ring, pole teeth arranged in the radial direction are arranged on the top wall of the magnetic conductive ring and distributed on the two sides of the inner periphery and the outer periphery of the permanent magnets, magnetic liquid used for sealing is attracted to the tooth top faces of the pole teeth, the bottom plate and the rotating disc are subdivided with the diameter as a subdivision line, and subdivision end faces are connected and assembled through bolts. And the bottom plate, the magnetic conductive ring and the turntable are all made of a magnetic conductive material. The device is simple and novel, a bearing is replaced by the balls, the bolts of a split structure are used for splicing, the structure of the device is simplified, on the premise that the anti-swing capacity and the sealing capacity are guaranteed, the installation steps are simplified through split installation, and the production and installation cost is reduced.

This invention discloses a method for preparing magnesium aluminum spinel using calcium aluminate filter residue from water treatment agents, belonging to the field of magnesium aluminum spinel synthesis technology. The method involves drying the calcium aluminate filter residue from water treatment agents and then calcining it at a low temperature of 400-800℃ to obtain an intermediate material. This intermediate material is then mixed with a magnesium source and rare earth oxides and ball-milled to obtain a mixed powder. The mixed powder is then pressed into pellets and sintered at a high temperature of 1400-1700℃ to obtain magnesium aluminum spinel. This method uses calcium aluminate filter residue from industrial solid waste water treatment agents as the main raw material, fully utilizing its raw material characteristics to prepare a high-purity, high-density magnesium aluminum spinel product, achieving high-value utilization of waste. Furthermore, this method is simple to operate, low-cost, and easy for industrial production.

The invention relates to the technical field of batteries, and discloses a sodium battery positive electrode material with a heterostructure and a preparation method and application thereof.The preparation method comprises the steps that 1, a nickel source, a manganese source and a first solvent are subjected to first mixing, and a solution A is obtained; carrying out second mixing on a niobium source and a second solvent to obtain a solution B; (2) under a protective atmosphere, carrying out a co-precipitation reaction on the solution A, the solution B, a precipitator solution and a complexing agent solution to obtain a first precursor material; (3) performing third mixing on the first precursor material, a lithium source and a sodium source, and performing first heat treatment to obtain a second precursor material; and (4) carrying out second heat treatment on the second precursor material to obtain the sodium battery positive electrode material with the heterostructure. According to the preparation method provided by the invention, a coprecipitation reaction is combined with a two-time heat treatment process, and the cathode material with a heterostructure, which is uniform in distribution and stable in structure, is prepared, so that the electrochemical performance of a battery is improved.

This application relates to solar cells, sliced ​​solar cells, tandem solar cells, and photovoltaic modules. The solar cell includes: a substrate having a first surface and a second surface disposed opposite each other in the thickness direction; a groove structure formed on the first surface, the groove structure including a bottom surface recessed inward relative to the first surface, a side surface extending from the first surface toward the bottom surface in the thickness direction, and an inclined surface extending obliquely from one end of the side surface away from the first surface and connected to the bottom surface, the side surface being perpendicular to the bottom surface, the angle between the inclined surface and the bottom surface being 32° to 48°, and the ratio of the height of the side surface to the height of the inclined surface in the thickness direction being 2:1 to 11:1; and a textured region formed on the first surface, the textured region including a first protrusion located at the edge of the groove structure, the first protrusion being a truncated pyramid. This application can improve photoelectric conversion efficiency.

The aerosol substrate piece, the aerosol substrate section, the preparation method thereof and the aerosol product are disclosed. The aerosol substrate piece comprises a piece-shaped substrate, the piece-shaped substrate comprises a plurality of substrate strips arranged in parallel, at least one connecting area is formed between adjacent substrate strips, the connecting area connects the adjacent substrate strips, and the aerosol substrate piece can be heated to generate an aerosol. The aerosol substrate piece disclosed by the embodiments of the present disclosure can be connected together through the connecting area between the adjacent substrate strips, which is conducive to improving the integrity and overall strength of the piece-shaped substrate, thereby being conducive to reducing displacement caused by factors such as vibration during transportation, storage or use, thereby further improving the stability of the suction resistance, and meanwhile, the situation that the substrate strips are broken and fall off can be improved, which is conducive to improving the suction stability and yield.

This invention discloses a method for preparing a tungsten carbide-doped carbon-supported platinum (Pt / C) catalyst and its application. The method involves mixing tungsten oxide and a carbon support in an organic solvent via a hydrothermal process to obtain a precursor powder. The precursor powder is then heat-treated at high temperature and cooled to obtain W-C powder, which is mechanically mixed with conductive carbon powder in an organic solvent to obtain a W-C / C composite support. This support is dispersed in a solvent, and a platinum source is added for reduction. The resulting product is washed and dried to obtain the Pt / W-C / C catalyst. The catalyst is then slurried and coated onto both sides of a proton exchange membrane to form a three-in-one membrane electrode. This invention provides a relatively simple and highly controllable preparation method. By combining hydrothermal synthesis with high-temperature carbonization, the uniform formation and high stability of the W-C framework are ensured. Furthermore, through optimized platinum loading and ionic liquid doping processes, the controllable preparation of a high-performance, high-durability membrane electrode is achieved.