1729results about How to "Avoid separation" patented technology

The invention discloses a preparation method and application of a lithium-rich manganese-based positive electrode material of a lithium defect type layered spinel composite phase synthesized by a rapid thermal shock method, and the preparation method comprises the following steps: firstly, preparing a lithium-rich manganese-based precursor by using a coprecipitation method; and mixing the precursor and a lithium salt, and rapidly heating the sample by using Joule heat passing through the powder sample as a heat source to obtain the layered spinel composite phase positive electrode material with lithium defects, and the lithium-rich manganese-based positive electrode material with higher lithium deficiency, a layered spinel composite structure and more excellent performance is generated through ultrafast heating and cooling rate and short-time heat preservation. According to the preparation method disclosed by the invention, the lithium-rich manganese-based positive electrode material with the composite structure, which is relatively large in lithium deficiency, is prepared through a rapid thermal shock technology and has the advantages of high capacity, high first efficiency and long cycle stability; the preparation method is simple, the material cost is greatly reduced, large-scale production can be realized, the production efficiency is improved, and the energy consumption is reduced.

The high-strength gypsum fiber keel comprises a U-shaped keel structure and a tooth-shaped keel structure, the U-shaped keel structure comprises a first plate body, first mounting holes and outer edge plates, the outer edge plates are connected to the two ends of the first plate body, and meanwhile the first mounting holes are formed in the first plate body; and the tooth-shaped keel structure comprises a second plate body, a second mounting hole, a tooth groove and a convex plate. According to the high-strength gypsum fiber keel, by-product gypsum is adopted as a raw material of the keel and is a resource comprehensive reutilization material, the gypsum fiber keel is an inorganic material and an environment-friendly A1-level fireproof material, and gypsum is used as a keel material and is better combined with other surface materials such as gypsum jet wall mortar, so that the gypsum jet wall can be better combined with other surface materials; separation caused by thermal expansion and cold contraction during long-term use can be avoided, and meanwhile corrosion of light steel keel materials after long-term use is avoided.

The invention relates to the technical field of coatings, and provides an antifouling coating as well as a preparation method and application thereof. The antifouling paint comprises a component A and a component B, wherein the component A comprises fluorosilicone modified acrylic resin, fluorinated paraffin, modified nano attapulgite, a wetting agent, a defoaming agent and a dispersing agent; a modifying agent of the modified nano attapulgite is 2-imidazole-1-ethylamine and 2-(3, 4-cyclohexyl oxide) ethyl triethoxy silane, and a modifying agent of the modified nano attapulgite is 2-imidazole-1-ethylamine and 2-(3, 4-cyclohexyl oxide) ethyl triethoxy silane; and the component B comprises a curing agent and a diluent. The nano attapulgite is modified, so that the dispersity of the nano attapulgite in the coating and the compatibility of the nano attapulgite with resin are improved, the nano attapulgite can be subjected to cross-linking reaction with other network structures to form a more compact cross-linked network, and the mechanical strength and the wear resistance of the coating are further improved.

The invention relates to the technical field of batteries, and discloses a battery and a battery pack. The shell is made of steel and is of a quadrangular prism structure, the shell comprises a shell body and a cover plate, at least one end of the shell body is open, and the cover plate is welded to the open end of the shell body to form a welding area; the tensile strength of the welding area is F, the first surface of the shell is provided with a pressure relief structure, the projection area of the pressure relief structure on the first surface is S, the area formed by enclosing of the first surface is S0, F * (S / S0) is larger than or equal to 8 and smaller than or equal to 400, the unit of F is MPa, the unit of S is mm < 2 >, and the unit of S0 is mm < 2 >. By comprehensively controlling the tensile strength F and the occupied area S / S0 of the pressure relief structure on the first surface, more serious safety accidents such as blockage of the pressure relief structure by the battery cell, incapability of normal pressure relief, burst-open of the cover plate and ignition of the battery when thermal runaway of the battery occurs are avoided, so that the safety of the battery is ensured.

The invention relates to the technical field of batteries, and discloses a battery shell and a battery. The battery case includes: a case having an opening; the cover plate seals the opening to form a containing cavity, the cover plate comprises a cover plate body and a folded edge arranged on the edge of the cover plate body, the folded edge extends in the direction away from the containing cavity and is welded to the shell, a welding area is formed at the welding position of the folded edge and the shell, and in the extending direction of the folded edge, the cover plate body is located on the side, close to the containing cavity, of the welding area. In the direction perpendicular to the upper surface of the cover plate body, the distance between the side, close to the containing cavity, of the welding area and the upper surface of the cover plate body is h, the distance between the side, away from the containing cavity, of the folded edge and the side, close to the containing cavity, of the cover plate body is H, and h / H is larger than or equal to 0.17 and smaller than or equal to 0.5. The cover plate can play a buffering role, and the cover plate is prevented from being separated from the shell during thermal runaway; meanwhile, the overall height of the cover plate can be controlled, and the internal space of the shell is ensured, so that the energy density of the single battery is ensured.

The invention relates to a preparation method and application of a sandwich-structured gas diffusion electrode, and belongs to the fields of electrochemical catalysis, carbon dioxide utilization and renewable energy sources. According to the preparation method, a catalyst layer, a cation layer and a protective layer are prepared on a gas diffusion substrate in a layered manner; the catalytic layer, the cation layer and the protective layer respectively play roles in catalyzing CO2 reduction, adjusting the microenvironment, preventing cation leakage and the like. When applied, the sandwich-structured gas diffusion electrode GDE prepared by the method can be assembled on electrochemical carbon dioxide reduction modules such as a flow battery and a membrane electrode assembly (MEA) to carry out electrochemical reduction reaction of CO2, has high activity and high stability, and can avoid adding inorganic alkali metal cations into catholyte to inhibit hydrogen evolution side reaction. Based on the invention, GDE can be prepared through a microenvironment engineering means, and the performance of the electrochemical reduction reaction of carbon dioxide is improved.

The invention discloses a preparation method of a flame-retardant anti-aging polyolefin plastic, and belongs to the technical field of polyolefin material processing.The preparation method comprises the steps that a modified anti-aging agent is mixed with a DOPO-based flame retardant modified by introducing isocyanate and epoxy groups, the mixture is added into a polyolefin material, during combustion, carbon formation is promoted by the phosphorus element, and the flame-retardant anti-aging polyolefin plastic is obtained. The flame retardant and nitrogen element synergistically play a flame-retardant role, meanwhile, epoxy groups in the flame retardant and carboxyl of polypropylene are subjected to a ring-opening reaction, the crosslinking degree of the material is enhanced, the modified anti-aging agent can effectively capture free radicals and inhibit oxidative degradation, and the mechanical strength and flame-retardant effect of the material are improved. According to the modification method, the anti-aging, high-temperature-resistant and flame-retardant properties of the polyolefin plastic are remarkably improved, the stability of the polyolefin plastic in high-temperature and severe environments is enhanced, the service life is prolonged, and the mechanical property and the thermal stability of the polyolefin plastic are improved.

The invention relates to the technical field of automobile brake control, in particular to a double-caliper automobile brake, symmetrical assembling equipment and an assembling method.The double-caliper automobile brake comprises a brake disc, two sets of hydraulic calipers are arranged on the brake disc, and each set of hydraulic calipers is connected with an oil pumping structure; the control box is connected with the oil pumping structure; the deflection plate is arranged in the control box, and the deflection plate can be matched with the oil pumping structure to drive the hydraulic calipers to act; the driving assembly is installed in the control box and connected with the deflection plate, and when a brake pedal is stepped down, the driving assembly can drive the deflection plate to act towards the oil pumping structure; and the switching assembly is connected with the driving assembly and the deflection plate, and the switching assembly can drive the deflection plate to deflect when one set of hydraulic calipers keeps the braking action for preset time, so that the two sets of hydraulic calipers alternately execute the braking action, and the high temperature of the braking system is avoided.

The invention relates to a urea injection pipe structure, a cleaning device and a cleaning method. The urea injection pipe structure comprises a connecting valve and an electromagnetic plug connector installed on the connecting valve, and a flow guide pipe and a conveying pipe are arranged on the two sides of the connecting valve respectively; the fixing disc is installed at the end of the conveying pipe, a plurality of first through holes distributed at equal intervals in the circumferential direction are formed in the fixing disc, and a conveying assembly matched with the first through holes is arranged in the conveying pipe and used for discharging urea in the conveying pipe through the first through holes; and the conduction regulation and control mechanism is arranged on the fixed disc and connected with the conveying assembly, the conduction regulation and control mechanism can act when the conveying assembly moves and adjust the conduction state of the first conduction hole, and when urea crystals are generated in the first conduction hole, the conduction regulation and control mechanism can be controlled to move through the conveying assembly, so that the conduction state of the first conduction hole is adjusted; therefore, the first via hole is always kept in a smooth state.

The invention provides a precise circuit packaging substrate and a manufacturing method thereof, and the method comprises the following steps: providing a substrate which comprises a core plate and a conductive metal layer at least disposed on the first surface of the core plate; forming a grain boundary buffer material layer on the surface, far away from the core plate, of the conductive metal layer, and pretreating the grain boundary buffer material layer to obtain a grain boundary buffer layer; providing an electroplating shielding layer, and forming a base circuit layer on the surface, away from the substrate, of the grain boundary buffer layer based on the electroplating shielding layer; at least one layer of wiring structure is formed on the surface, away from the substrate, of the base circuit layer, the wiring structure comprises a dielectric layer covering the exposed surface of the base circuit layer, a metal connecting layer penetrating through the dielectric layer and a conductive circuit layer located on the surface, away from the base circuit layer, of the dielectric layer, and the metal connecting layer is electrically connected with the base circuit layer and the conductive circuit layer. According to the precise circuit packaging substrate and the manufacturing method thereof, the problem of circuit separation in the process of manufacturing the precise circuit packaging substrate is avoided, and the yield of the packaging substrate is improved.

The invention relates to welding equipment and a welding process for miniature transformer production, and relates to the technical field of welding equipment. The welding device comprises a welding frame, a conveying box fixed to the welding frame and a plurality of supporting plates arranged on the welding frame. Each supporting plate is provided with two miniature transformer shells, a welding device used for welding the two miniature transformer shells and a buffering piece used for conducting lifting buffering on the welding device. Each supporting plate is provided with an adjusting assembly used for turning over and horizontally moving the two miniature transformer shells, and the welding frame is provided with a driving part used for driving the adjusting assemblies, a paint spraying part used for spraying paint on the two miniature transformer shells and a fixing part used for automatically fixing the supporting plates. According to the welding device, the welding device can be controlled to weld the inner curved surface and the inner inclined surface of the miniature transformer shell in an irregular shape, a worker does not need to turn over and adjust the miniature transformer shell, and the labor intensity of the worker is relieved.

The invention discloses high-dispersity modified gold paste mixing equipment for a thermal printing sheet and a process of the high-dispersity modified gold paste mixing equipment, and relates to the technical field of material mixing. Under tightening and clamping of inner and outer barrel walls, four groups of frustum-shaped stirring rods with downward big heads can be gradually folded inwards and block-shaped materials are positioned among the four stirring rods; the four inclined outer walls gradually extrude and push the agglomerated powder which cannot be scattered along with the folding, so that the agglomerated powder is gradually upwards jacked up by the four groups of stirring rods which are gradually drawn close, and the four groups of stirring rods simultaneously rotate and revolve, and the stirring outer barrel is higher than the separation inner barrel, so that the agglomerated powder is separated from the separation inner barrel. Therefore, caked powder or other foreign matters which are gradually jacked up can be gradually thrown into the separation inner cylinder under the action of rotary centrifugation, so that impurities and blocky powder which is difficult to scatter can be discharged through the separation inner cylinder in a self-adaptive manner, and the self-adaptive stirring device is simple and ingenious in structure, strong in functionality and suitable for mixing and stirring various materials.

The utility model discloses a marble slab dry hanging anti-falling structure which comprises a plurality of marble slabs and a pre-assembling device, and the pre-assembling device is composed of a keel structure and two opposite pre-buried steel belts, the keel structure is formed by interweaving a plurality of vertical keels and a plurality of transverse keels, the radial section of the keel structure is in a net shape, every two adjacent transverse keels are in clearance fit, the transverse keels and the adjacent vertical keels are combined to form a grid area, and stainless steel connecting pieces are connected between each vertical keel and the transverse keels. The two ends of the vertical keels are connected with the embedded steel belts correspondingly, and the transverse keels are provided with anti-falling pieces used for being connected with the marble slabs and preventing the marble slabs from falling off and damping pieces used for being installed between the marble slabs and the transverse keels. The problem that in the prior art, a transverse keel, a vertical keel, a marble fastener and a connecting part are rusted and fractured, so that a marble slab of a marble dry-hanging outer ring falls off is solved.

The invention relates to a pseudo-classic building roof structure and a construction method thereof, and relates to the technical field of pseudo-classic building roofs, the pseudo-classic building roof structure comprises a main ridge, grey tiles and a reinforcing gauze element, the main ridge comprises a beam body and roof supporting frames, and the roof supporting frames are arranged on the two sides of the beam body; a cornice is arranged on the side, away from the beam body, of the roof supporting frame, a wall frame is arranged below the cornice, and an outer protection body is arranged on the edge of the wall frame. The gaps are reserved between the grey tiles through the reinforcing gauze element, then when thermal expansion and cold contraction occur between the concrete structure and the grey tiles due to the environment, the gaps reserved between the grey tiles can prevent the grey tiles from being extruded due to thermal expansion and cold contraction, and the reinforcing gauze element is structurally made of polyester fiber gridding cloth, so that the reinforcing gauze element is not prone to deformation. The concrete has good flexibility and weather resistance, the reinforcing gauze element enhances the structural strength of the concrete, and cracking or deformation of the concrete structure when the concrete structure is stressed is reduced.

The utility model relates to a connector, a wire harness structure and an electronic device, and the connector comprises a female head assembly which comprises a female sleeve body and a clamping part disposed on the peripheral wall of the female sleeve body; the male head assembly comprises a male sleeve body used for being matched with the female sleeve body in an inserted mode and a locking part arranged on the peripheral wall of the male sleeve body. Wherein the locking part can be guided into the clamping part in a sliding mode under the driving of the male sleeve body, so that the locking part is matched with the clamping part in a locking mode, and the clamping part can rotate under the driving of the female sleeve body so as to be separated from the locking part in an unlocking mode. The connector is simple to operate and convenient to use, a user can stably connect the female head assembly and the male head assembly of the connector through simple operation, the connection stability of the female head assembly and the male head assembly of the connector is ensured, the female head assembly and the male head assembly are prevented from being separated by external force in the use process of the connector, and the service life of the connector is prolonged. And the female head assembly and the male head assembly of the connector can be easily disconnected and separated, so that the overall use convenience of the connector is improved.

The invention relates to hydrogel containing all-type sun-screening agent microbeads, a preparation method and application, and belongs to the technical field of sun screening. Mixing, heating and dissolving the oil-soluble organic sun-screening agent to obtain the sun-screening oil; the preparation method comprises the following steps: mixing a sodium alginate solution, a PVA solution and an inorganic sun-screening agent (zinc oxide and titanium dioxide) to form a turbid liquid, and uniformly stirring to form a first mixture; preparing oil-in-water microspheres from the obtained sunscreen oil and the first mixture through a microfluidic technology, and dripping the oil-in-water microspheres into a calcium chloride solution to form light yellow sunscreen microspheres; adding carbomer sodium into water to form gel, then adding the water-soluble organic sun-screening agent, adding the pH regulator while heating and dissolving until the solution is transparent, then adding the active substance, and continuously stirring until the mixture is uniformly mixed to obtain a third mixture; adding a thickening agent to prepare hydrogel; and adding the sunscreen microbeads into the hydrogel to obtain a dispersion system containing all types of sunscreen microbeads. The invention solves the technical problem that the product in the existing sunscreen system is greasy and easily causes anaphylactic reaction.

The invention discloses an air frying and deep frying combined fryer and a flour-wrapped food frying method. The combined fryer comprises a fryer body, an air frying device is arranged on the upper portion of the fryer body, and a fryer is arranged on the lower portion of the fryer body; a frying basket is arranged between the air frying device and the fryer, and a frying basket lifting mechanism is arranged in the fryer body. The method comprises the following specific steps: S1, adding edible oil into a fryer and starting heating; s2, putting the flour-wrapped food in a frying basket, and lowering the frying basket into an oil layer through a frying basket lifting mechanism after the oil temperature is increased to a set temperature, so that the oil layer submerges the flour-wrapped food; s3, after the flour-wrapped food is heated and shaped in the fryer, the fryer basket lifting mechanism moves reversely to enable the fryer basket to rise to the position above the oil layer, and the air frying device is started to continue to heat the food. The combined mode of low-temperature frying and high-temperature air frying is adopted, separation of a flour wrapping layer and food can be avoided, the surface of the food can be crisped, the food can be quickly cooked, grease can be drained, the heating time of the food in the fryer is shortened, and the food is healthier.

The invention provides a lactobacillus rhamnosus Lr-Ca011 capable of promoting calcium absorption, a metagen, a calcium product and a nano emulsification and homogenization preparation method of the lactobacillus rhamnosus Lr-Ca011, and belongs to the technical field of probiotics. The lactobacillus rhamnosus Lr-Ca011 is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.32037, and the lactobacillus rhamnosus Lr-Ca011 can promote the absorption of calcium. According to the invention, the lactobacillus rhamnosus Lr-Ca011 is used for fermentation to prepare the metagen, and the metagen also has the effect of promoting calcium absorption. In addition, a water phase and an oil phase containing the metabiotics are mixed and dispersed to obtain a crude emulsion, and then a calcium product is obtained by adopting a nano-emulsification homogenization method. According to the nano emulsifying and homogenizing method, the crude emulsion forms more stable nano particles, release of functional components can be effectively controlled, a calcium product has the characteristic of high absorptivity, and the bioavailability of calcium is improved.

The utility model provides pull-type sectional material interruption cutting equipment which comprises a traction rack and a cutting rack which are arranged side by side, an upper traction machine and a lower traction machine which are used for pulling sectional material cutting are arranged on the traction rack in a sliding mode, and a middle cutting saw used for cutting sectional materials is arranged on the cutting rack in a sliding mode. A conveying rack is arranged between the traction rack and the cutting rack, and a plurality of conveying roller sets used for conveying profiles are installed on the conveying rack. A synchronizing mechanism is fixedly arranged on the middle cutting saw and is connected with the middle cutting saw and the lower traction machine; the synchronizing mechanism is arranged to enable the middle cutting saw and the lower traction machine to keep synchronous, so that stable cutting of section bars is guaranteed, the lock catch plate and the jaw plate which can be separated in one direction are matched to achieve synchronous driving, the middle cutting saw and the lower traction machine are effectively prevented from being separated, and meanwhile the lock catch plate is in non-rigid connection through the spring, so that the service life of the middle cutting saw is prolonged. Normal separation failure caused by rigid connection is effectively prevented.

The utility model discloses a dry land wheat accurate seeding device, including frame, seed box, transmission seeding device, fixed plate and seeding pipe, the seed box is fixedly connected in the top of frame, transmission seeding device is located in the bottom of seed box and is movably connected with frame, fixed plate is fixedly connected in the frame, and seeding pipe is fixed in the frame. A plurality of sowing pipes are fixedly connected to the interior of the fixed plate, are distributed at equal intervals, and are positioned at the bottom of the transmission sowing device. By arranging the adjusting sleeve, the adjusting sleeve can adjust the height of seed sowing leakage, and the problems that in the using process, wheat seeds are sown into gullies for sowing, the thicknesses of dry lands in different areas are different, the depths of the gullies are different, a planting head cannot be adjusted, and the planting efficiency is poor are solved. When the height of a planting head is high, the wheat seeds can be influenced by wind power to deviate when falling, so that the sowing of the wheat seeds is influenced.

The utility model discloses a well workover flow-back fluid treatment system based on oil-based mud. The well workover flow-back fluid treatment system comprises a first heating reaction kettle and a second heating reaction kettle, the vibrating screen is communicated with one end of the first heating reaction kettle; one end of the second heating reaction kettle is communicated with the vibrating screen; one end of the horizontal screw centrifuge is communicated with the other end of the second heating reaction kettle; the three-phase disc type centrifugal machine is communicated with the other end of the horizontal screw centrifugal machine; the oil-water separation filter is communicated with the three-phase disc type centrifugal machine; the rock debris collecting box is communicated with the vibrating screen, the horizontal screw centrifuge and the three-phase disc type centrifuge at the same time; and the white oil tank is simultaneously connected with the oil-water separation filter and the three-phase disc type centrifugal machine. And the oil-based mud well completion flow-back fluid can be directly and continuously operated on site, so that the wastewater reaches the standard and is discharged, and the wellhead operation efficiency of a drilling platform is improved.

The invention relates to a road infrastructure full-automatic inspection method, device and equipment based on an unmanned aerial vehicle group, and a medium thereof. The method aims at the problem that disease characteristics collected by unmanned aerial vehicles in traffic flow and vegetation shielding scenes are broken, and the method comprises the following steps of: decoupling texture and motion characteristics of a dynamic shielding area; feature maps of the effective area and the shielding area are separated; performing cross-frame splicing and continuous repair on the fracture features by using an optical flow constraint generation network, and reconstructing the geometric integrity of a shielded region; infrared data are fused to correct thermal deformation errors, and a high-precision continuous curved surface model is generated; and finally, based on a disease quantitative feature vector matching maintenance strategy, realizing full-process automation from data acquisition to decision output. According to the method, the continuous modeling precision and the maintenance decision reliability of pavement disease detection in the shielded environment are remarkably improved.

The invention relates to the field of automatic production lines, and discloses small power supply charger boxing equipment which comprises a lower-layer transmission line, a box body jacking and extending mechanism and an upper-layer bagging and boxing mechanism. The lower-layer transmission line transmits a box body to the box body jacking and extending mechanism from a starting position, and the box body jacking and extending mechanism jacks and extends the box body at the tail end of the transmission line to the upper-layer transmission line; the product feeding conveying mechanism and the PE bag feeding conveying mechanism of the upper-layer bagging and boxing mechanism convey products and PE bags to the bagging module correspondingly, the products are bagged into the PE bags, and the PE bags are conveyed to the position of the boxing module through the PE bag feeding conveying mechanism. Compared with the prior art, box conveying and bagging boxing are divided into an upper layer and a lower layer through the lower-layer conveying line and the box jacking and stretching mechanism, PE bag openings are folded upwards through the overturning and transplanting module and the bag folding clamping jaw module, the occupied space of equipment is reduced, and meanwhile bagged products are prevented from being separated from PE bags.

The anti-loosening hanging bracket comprises a fixing plate, a U-shaped support is arranged below the fixing plate, a plurality of rectangular branch pipes are fixedly connected to the bottom of the U-shaped support, threading sleeves are fixedly connected to the bottom ends of the rectangular branch pipes, and rectangular sliding holes communicated with the interiors of the corresponding rectangular branch pipes are formed in the inner walls of the tops of the threading sleeves. Vertical missile buffer assemblies are fixedly connected to the two sides of the bottom of the fixing plate, the two vertical missile buffer assemblies are sleeved with a U-shaped support, and the same elastic tightening pressing and fixing assembly is slidably arranged in a rectangular branch pipe and a corresponding rectangular sliding hole in a sleeved mode. According to the utility model, a series of structures are arranged, so that a plurality of cables can be synchronously, rapidly, stably, elastically, tightened and fixed to prevent loosening, one-by-one fixation is not needed, the fixing efficiency and stability are improved, stable tightening and fixed pressing can be ensured when the cables vibrate, and vertical elastic buffering force unloading can be carried out on the cables at the same time; and the safety of hanging and supporting a plurality of cables is improved.

The invention, which relates to the technical field of discharge detection, discloses a detection system for partial discharge of a transformer, comprising a bottom plate and a detection assembly. The detection positioning instrument body is installed on the upper side of the bottom plate, two wiring holes are formed in the front side of the detection positioning instrument body, wiring heads are installed in the wiring holes, the moving assembly is installed on the edge of the bottom plate, and the clamping assembly is installed on the upper side of the detection positioning instrument body. A fixing assembly is installed on the right side of the detection positioning instrument body, an angle adjusting assembly is installed on the rear side of the detection positioning instrument body, and the angle adjusting assembly is fixed to the upper side of the bottom plate; the detection assembly comprises fixing blocks, a rotating shaft, a winding barrel, a wiring cable, a connecting plug and a detection head, the two corresponding fixing blocks are fixed to the right side of the detection positioning instrument body, rotating holes are formed in the middles of the fixing blocks, carrying is convenient, and a circuit connector can be prevented from falling off during detection.

The invention relates to a silicon-carbon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: carrying out thermal polymerization on a first carbon source to obtain soft carbon microspheres; carrying out spray coating, cooling curing and first heating activation on soft carbon microspheres, a second carbon source, graphite carbon nanodots and an activating agent, and then neutralizing and washing with acid to obtain a porous carbon sphere precursor; under an inert atmosphere, feeding a silicon source into the porous carbon sphere precursor, and carrying out secondary heating, so that the silicon source is cracked, and the silicon elementary substance is deposited and adsorbed in the porous carbon sphere to obtain a porous silicon carbon sphere; and heating the porous silicon carbon spheres, introducing an organic gas, and forming a carbon layer on the surfaces of the porous silicon carbon spheres to finally obtain the silicon carbon negative electrode material. After the obtained silicon-carbon negative electrode material is rolled by an external force, particle breakage caused by separation of the porous carbon spheres and the heterogeneous porous carbon layer can be avoided, and the structural strength of the silicon-carbon negative electrode material is improved, so that the capacity of a battery system is improved, and the cycle life of the battery system is prolonged.

The invention belongs to the technical field of biological fermentation, and discloses a method for producing L-histidine through fermentation, which comprises the following steps: step 1) preparing a primary seed solution, step 2) preparing a secondary seed solution, step 3) fermenting, step 4) centrifuging and filtering, step 5) decoloring, and step 6) crystallizing. In the separation and purification process, ion exchange resin is prevented from being used for separation, the amount of generated wastewater is small, and the method is environment-friendly; the method mainly adopts the processes of centrifugation, filtration, decoloration and the like, avoids the use of organic solvents, is simple and feasible to operate, and is suitable for large-scale production.

The utility model discloses a seedling raising box for rice planting, which comprises a seedling raising box, a support frame slidably arranged in the seedling raising box and a seedling raising plate mounted in the support frame, trapezoidal sliding grooves are symmetrically arranged on the inner wall of the seedling raising box, trapezoidal sliding blocks are slidably arranged in the trapezoidal sliding grooves, and two ends of the support frame are slidably arranged in the seedling raising box through the trapezoidal sliding blocks. The trapezoid sliding blocks can be installed in the trapezoid sliding grooves through fixing bolts, an extension plate is fixed to the inner wall of the supporting frame, the seedling raising plate is installed in the supporting frame through the extension plate, a plurality of partition plates are installed in the seedling raising plate, and the seedling raising plate is divided into seedling raising areas through the partition plates. A spraying and irradiating assembly used for spraying and irradiating rice is arranged at the top of each seedling raising plate, a plurality of partition plates are installed in each seedling raising plate, so that the situation that roots and stems of rice seedlings extend and grow in the soil of the seedling raising plate in a staggered mode and are inconvenient to separate in the later period is avoided, and automatic watering of the seedlings can be achieved by installing the spraying and irradiating assemblies; the seedling raising box does not need to be manually opened for irrigation every time.