2671results about How to "Increasing the thickness" patented technology

The invention discloses a hot galvanizing coating thickness prediction method based on a random forest algorithm, and relates to the technical field of hot galvanizing steel coil production, and the prediction method comprises the steps: producing a hot galvanizing steel coil through a hot galvanizing technology, and obtaining the production historical data of the hot galvanizing technology; preprocessing the historical data and eliminating the time lag of the thickness gauge; performing feature screening based on a mechanism and a correlation coefficient; establishing a random forest network coating thickness prediction model and training; verifying and judging the accuracy and applicability of the random forest network coating thickness prediction model; if the model prediction precision does not meet the requirement, optimizing prediction model parameters; if the requirements are met, putting the prediction model into use; and outputting a zinc layer thickness prediction value. According to the method, the problem of detection time lag in galvanized sheet zinc layer thickness control is solved, and technological parameter adjustment and thickness target control are optimized.

The invention discloses a communication network power distribution cabinet convenient for heat dissipation, and relates to the technical field of power distribution cabinets, and the power distribution cabinet comprises a composite mechanism. According to the communication network power distribution cabinet convenient to dissipate heat, through the design of a composite mechanism, the box body shell is used for storing electronic components, after long-time operation, the temperature in the box body shell rises, hot gas rises, and then the hot gas flows to the processing mechanism from the circular groove, so that the heat dissipation effect is achieved, and the internal temperature of equipment is reduced; the ventilation mechanisms are arranged on the two sides of the box body shell, so that the convection effect is achieved, the cold air flowing effect is improved, the cold air is located at the low position with the high density, hot air is squeezed upwards after entering the box body shell, the discharging speed is increased, and the heat dissipation efficiency is improved. The box body shell is supported through the supporting assembly, so that the effect of reducing deformation of the box body is achieved, and internal electronic elements are protected.

The invention discloses a transparent material / metal dissimilar material ultrafast laser welding method based on a burst mode, and belongs to the technical field of laser micro-nano machining, and the transparent material / metal dissimilar material ultrafast laser welding method comprises the steps that the surface roughness and flatness of a pre-welded piece are treated through a mirror grinding and polishing technology, so that a sample piece reaches the optical contact condition, the pre-welded piece is in lap joint with a tool platform through a specially-made clamp, and the pre-welded piece is welded to the tool platform; when a visual Newton ring appears on a contact surface and an ultrafast laser focus is located at a material interface, using a burst mode under an ultrafast laser processing platform to increase the number of sub-pulses, welding a micro-area, equally dividing the energy of a single pulse into a plurality of pulses, and then emitting light in a pulse sequence mode, by using the burst mode containing multiple pulses, the heat accumulation effect can be achieved more easily, the ablation efficiency and the connection strength and stability of the transparent material and the metal heterogeneous material are improved while the machining rate is increased, and the method has wide application prospects.

The invention relates to the technical field of battery materials, in particular to a graphite negative electrode material and a preparation method and application thereof. The graphite negative electrode material comprises graphite particles, the average length La of the graphite particles in the alpha-axis direction of microcrystals is larger than or equal to 40 nm, the average thickness Lc of the graphite particles in the c-axis direction of the microcrystals is larger than or equal to 25 nm, and the interlayer spacing d002 ranges from 0.336 nm to 0.338 nm, and the number parameter of the microcrystals contained in each single graphite particle is defined as N = D503 / (La2 * Lc); d50 is the median particle size of the graphite particles, the unit is [mu] m, and the numerical value of N is more than 0 and less than or equal to 0.04. The graphite negative electrode material disclosed by the embodiment of the invention comprises the graphite particles with stable microcrystalline structure, large microcrystalline size and large interlayer spacing, so that the expansion and stress distribution uniformity of the negative electrode material in the circulation process is improved, the diffusion of ions in the graphite particles is facilitated, the consumption of active lithium is reduced, and the service life of the negative electrode material is prolonged. And the dynamic and super-long cycle stability of the graphite negative electrode material is improved.

The utility model relates to the technical field of new energy charging piles, and discloses a light storage and charging integrated new energy charging pile which comprises a charging pile body, a top plate is fixedly installed on the top of the charging pile body, a supporting rod is fixedly installed on the top of the top plate, and a cover plate is fixedly installed on the top of the supporting rod. According to the light storage and charging integrated new energy charging pile, the opening and retracting assembly is arranged, after the opening and retracting assembly is used, under mutual matched transmission of a gear, an inner gear ring and a rack, after a servo motor is started, a plurality of photovoltaic panels are driven to move towards the center of the bottom of a cover plate, and the photovoltaic panels can be blocked by the cover plate after moving; according to the charging pile, the photovoltaic panels are prevented from being damaged by severe weather such as accumulated snow and hail, the service life of the photovoltaic panels is prolonged, and in addition, the multiple photovoltaic panels can be driven to move towards the outer side of the cover plate, extend out of the cover plate, receive sunlight and convert solar energy into electric energy to be stored in the charging pile body.

The invention relates to an anti-aging oligopeptide for beauty and skin care, the oligopeptide has an amino acid sequence as shown in (X1) (R or K or H) G (D or E) # (X2), X1 represents one amino acid of G, A, V, L, I and P or represents that no amino acid exists, # represents one amino acid selected from A, V, D, E, N and Q, and X2 represents G and P or represents that no amino acid exists. The oligopeptide is a functional fragment of XVII type collagen, can induce in-vivo collagen synthesis or simulate a protein regulation function, has the effects of promoting cell self-cleaning, helping to remove aged skin cells, reconstructing skin rhythm, maintaining a good skin structure, resisting initial aging, promoting skin repair and regeneration, reducing fine wrinkles and the like, and is mild in action, free of side effects and free of toxic and side effects. The product has no obvious adverse reaction on human body, and is a good beautifying and anti-aging product.

The invention provides a processing method of an ultrathin plano-convex lens, which comprises the following steps: fixing a blank on a parallel disc, and carrying out rough grinding processing on a first surface to obtain a first rough grinding blank; the first rough grinding blank is polished, and a first rough grinding and polishing blank is obtained; the first surface of the first rough grinding and polishing blank is fixed to a parallel disc, and rough grinding machining is conducted on the second surface of the first rough grinding and polishing blank to obtain a second rough grinding blank; the second rough grinding blank is polished, and a second rough grinding and polishing blank is obtained; the second surface of the second rough grinding and polishing blank is fixed to an optical cement disc, and finish machining is conducted on the first surface of the second rough grinding and polishing blank to obtain a first finish machining lens; the first surface of the first finish machining lens is fixed to an optical cement disc through a base plate, finish machining is carried out on the overall appearance of the first finish machining lens to form a spherical surface, and the plano-convex lens is obtained. The problem that an existing ultra-thin plano-convex lens part is thin in size and prone to deformation, and consequently products do not reach the standard is solved.

The invention relates to a low-inductance SiC half-bridge power module layout structure based on overlapped copper bar conduction. Under the structure, the overlapped copper bars are used for replacing bonding wires in a traditional packaging structure, pits are machined in the copper bars to be connected with the power electrodes on the top face of the chip, the copper bars are bent to be connected with the substrate coated copper, and current conduction is achieved. Based on the overlapped copper bar structure, when the upper switch tube and the lower switch tube are switched on, mutual inductance and mutual suppression exist between current paths on the lower conductive copper bar and the upper conductive copper bar, and the module has low parasitic inductance; two ends of the upper-layer copper bar and the lower-layer copper bar are fixedly connected with the substrate, and the middle positions of the upper-layer copper bar and the lower-layer copper bar are fixedly connected with a chip top surface electrode, so that the module reliability is high; the thicknesses of the upper and lower copper bars are adjustable to ensure the through-current capability of the module; the copper bar is low in processing cost, does not need a cushion block, and reduces the number of connection interfaces. Therefore, compared with the existing layout packaging structure, the module layout structure provided by the invention has outstanding advantages in the aspects of parasitic inductance, outflow capacity and cost, and is suitable for popularization and application.

The invention discloses a waste gas treatment device for petroleum coke production, and relates to the technical field of waste gas treatment devices. Comprising supporting legs; the treatment box is fixedly connected to the supporting legs, an air inlet pipe is arranged on the upper side of the treatment box, an air outlet pipe is arranged on the lower side of the treatment box, a grid plate is installed in the treatment box, and activated carbon is arranged on the grid plate; and the two cleaning plates are symmetrically distributed and slidably connected to the interior of the treatment box, the symmetrically distributed cleaning plates are in contact fit, and the cleaning plates are used for cleaning activated carbon on the inner surface layer of the treatment box. The upper-layer activated carbon is pushed to two sides through back-to-back movement of the symmetrically-distributed cleaning plates, so that the part of activated carbon is separated from the rest of activated carbon, and then waste gas can penetrate through the activated carbon layer at a normal speed, so that the adsorption efficiency of the activated carbon is improved, and meanwhile, the air pressure in the treatment box and the air inlet pipe can be gradually recovered to an initial state; the stability of the treatment box is improved.

The invention relates to the technical field of photovoltaic sand control, and provides a comprehensive photovoltaic sand stabilization device and a sand stabilization method.The comprehensive photovoltaic sand stabilization device comprises two fixing bases, a protective net is installed between the two fixing bases, first threaded rods are installed on the inner sides of the fixing bases, and second motors are connected to the tail ends of the first threaded rods; a second threaded rod is installed on the outer side of the fixing base, and the tail end of the second threaded rod is connected with a first motor. The photovoltaic power generation mechanism is installed close to the water accumulation net, the photovoltaic panel can be overturned in the morning and evening, the front face of the overturned photovoltaic panel makes contact with the water accumulation net obliquely downwards, water molecules in air are condensed and attached to the photovoltaic panel and the water accumulation net through the water accumulation net at night, and the photovoltaic face of the photovoltaic panel is cleaned; dust raised by wind and sand in the daytime is prevented from influencing the generating capacity of the photovoltaic panel, meanwhile, water condensed by the photovoltaic power generation mechanism and the water accumulation net supplements water for growth of vegetation on the ground surface, and restoration of the vegetation in the desert area is facilitated.

The invention relates to the field of batteries, in particular to a negative plate and a battery comprising the negative plate. The negative plate comprises a negative current collector, a bottom coating and a negative active material layer, the bottom coating and the negative active material layer are positioned on one side or two sides of the negative current collector, the bottom coating is positioned between the negative current collector and the negative active material layer, the bottom coating comprises a three-dimensional structure formed by a first conductive binder, the first conductive binder comprises a first carbon nano tube, and the first carbon nano tube comprises a second carbon nano tube. The negative plate meets the following relational expression: 1.2 < = B / K < = 3.4, B is the length-diameter ratio of the first carbon nanotube, and K is the tensile strength of the negative current collector. According to the negative plate, the thickness of the priming coat can be greatly reduced, and the energy density of the battery is increased; the binding power between the negative electrode current collector and the negative electrode active material layer can be enhanced, the structural stability of the active material layer can be improved, the pole piece deformation and powder falling in pole piece processing and battery circulation can be improved, and the circulation expansion can be inhibited; the conductivity of the pole piece is improved and the fast charging performance of the battery is improved.

The invention discloses an integrated battery box body based on a double-circulation liquid cooling system, which comprises a box body, a battery area, a low-flow-rate pipeline, a high-flow-rate pipeline, a cooler and a liquid pump, a plurality of cooling plates are arranged in the battery area, and low-flow-rate flow channels and high-flow-rate flow channels are arranged in the cooling plates; the two ends of the cooling plate are provided with through openings and switching pipes which are in sliding sealing connection with the low-flow-speed flow channels and used for switching the high-flow-speed pipelines to be communicated with the high-flow-speed flow channels through sliding, and air bag assemblies used for pushing the switching pipes to slide through battery heat changes are arranged in the low-flow-speed flow channels. According to the invention, the battery box body is provided with a low-flow-rate pipeline and a high-flow-rate pipeline which can realize double circulation by only one liquid pump, so that the liquid cooling efficiency of the battery is enhanced; and the switching pipe and the airbag assembly are arranged in the cooling plate, so that the flow speed of the cooling liquid is automatically switched according to the battery temperature, and the liquid cooling efficiency of the cooling plate on the battery is enhanced.

The invention discloses a method for improving an acidic clayey soil plough layer, which comprises the following steps of: 1, after autumn rice is harvested, draining water in a rice field, and carrying out conventional tillage, soil turning and leveling on the rice field for later use; 2, green manure planting is conducted in the suitable green manure sowing period from October to November; 3, in the full-bloom stage, green manure is smashed, turned, pressed and returned to the field, lime and organic fertilizer are spread, the rice field is deeply ploughed at a time, and the green manure, the lime and the organic fertilizer are deeply buried in soil of the rice field; 4, the rice field is irrigated and soaked in water for a period of time, and then rice is planted. The method can inhibit and stabilize acid, improve the buffer performance of the soil, effectively expand a deep ploughing layer, improve the physical structure of the soil and improve the utilization rate of rainfall resources by the soil, so that the purposes of minimal ploughing, high yield and farmland protection are achieved.

The invention discloses a radar antenna pointing error compensation method, which establishes a pointing error correction formula to realize compensation by recording and analyzing a relation among a pointing error, an inertial measurement equipment value and an array surface structure temperature, and mainly comprises the following steps of: monitoring and recording the array surface structure temperature, extracting pointing error data, and compensating the pointing error. Selecting and recording values of the inertial measurement equipment, analyzing data, establishing a correction formula, and verifying a compensation effect. According to the invention, the problem of antenna pointing error caused by the adoption of inertial measurement equipment by a high-precision radar needing to be deployed in a motorized manner is solved.

The invention discloses a semiconductor device, relates to the technical field of semiconductors, and aims to reduce stray capacitance between gate stack structures and improve alternating current characteristics of the semiconductor device. The semiconductor device comprises a semiconductor substrate, a first gate-all-around transistor, a second gate-all-around transistor, an insulating layer, a first dielectric isolation layer and a second dielectric isolation layer. The insulating layer is disposed between the source / drain region included in the first gate-all-around transistor and the source / drain region included in the second gate-all-around transistor. And the first dielectric isolation layer and the second dielectric isolation layer are alternately stacked between a channel region included in the first gate-all-around transistor and a channel region included in the second gate-all-around transistor. A gate stack structure included in the first gate-all-around transistor and / or a gate stack structure included in the second gate-all-around transistor are located on the periphery of the first dielectric isolation layers and the second dielectric isolation layers which are alternately stacked, and film layers, located on the bottom layer and the top layer, in the first dielectric isolation layers and the second dielectric isolation layers which are alternately stacked are the first dielectric isolation layers.

The utility model discloses a ventilation top cover structure of a box-type substation, and relates to the related technical field of box-type substations. The device comprises a bottom plate, triangular side plates, top plates, air outlet channels and a fan, the triangular side plates are fixed to the two opposite side edges of the upper end of the bottom plate, the top plates are fixed to the inclined faces, in the same inclination direction, of the two triangular side plates, and second air outlets distributed at equal intervals are formed in each top plate in a penetrating mode; air outlet channels are fixed to the portions, outside the second air outlets, of the inclined face of the top plate, symmetrically-distributed ventilation openings are vertically formed in the bottom plate in a penetrating mode, and an inclined draught fan is arranged above each ventilation opening. By arranging the top plate, the bottom plate, the triangular side plates, the air outlet I, the air outlet II, the ventilation opening, the fan, the filter screen I, the filter screen II and the air outlet channel, the box-type substation top cover solves the problems that the box-type substation top cover is not provided with a ventilation structure, the heat dissipation effect is poor, enough weather resistance is needed during ventilation on the top cover, and the heat insulation effect of the top cover is poor.

The invention relates to the technical field of cables, in particular to a low-smoke halogen-free flame-retardant cable which comprises a plurality of conductor wire cores, the conductor wire cores are sleeved with isolation layers, the multiple isolation layers are sleeved with an inner sheath, the inner sheath is sleeved with a functional protection assembly, the functional protection assembly is wound with a binding tape, and the binding tape is wound with an outer sheath. The binding tape is sleeved with an outer sheath. The function protection assembly comprises a plurality of circular rings arranged outside the inner sheath in a sleeving mode, a cooling assembly is fixedly connected between every two adjacent circular rings, and isolation assemblies for preventing ignition points from extending from the spontaneous ignition point of the cable to the two sides are installed on the outer sides of the circular rings and comprise a plurality of elastic plates made of magnetic metal and fixedly connected with the circular rings. Limiting grooves are formed in the sides, away from the circular rings, of the elastic plates, and the multiple elastic plates are sleeved with rubber rings. The problem that the cost of protecting the cable when the existing cable is blocked by the bridge frame to move along the direction parallel to the cable at a short-circuit spontaneous ignition point is solved.

The utility model discloses a battery monomer, a battery, an energy storage device and a power utilization device. The battery cell includes a housing. An opening is formed in the end portion of the shell in the first direction. The shell comprises a first wall, a corner area and a second wall which are sequentially connected in the circumferential direction of the opening. The first wall is provided with a first body part and a first thickening part which are arranged in the first direction, the first body part is far away from the opening compared with the first thickening part, and the maximum thickness of the first thickening part is larger than that of the first body part. Wherein the corner area is provided with a second body part and a second thickening part which are arranged in the first direction, the second body part is farther from the opening than the second thickening part, and the maximum thickness of the second thickening part is larger than the thickness of the second body part. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

The invention discloses a graphene composite film with high thermal conductivity and a preparation method and application thereof. The preparation method comprises the following steps: preparing a graphene film on a copper-nickel alloy substrate by adopting a CVD (Chemical Vapor Deposition) method; wherein the graphene film comprises a single-layer graphene structure and a pagoda-shaped multi-layer graphene core structure dispersed on the surface of the single-layer graphene structure; applying the graphene oxide slurry to the surface of the graphene film so as to form a graphene / graphene oxide composite film; and carrying out carbonization, graphitization and calendaring treatment on the graphene / graphene oxide composite film to prepare the graphene composite film with high thermal conductivity. The method not only solves the problems that the graphene film prepared by the traditional CVD method is thin in thickness and cannot be commercially used on a large scale, but also improves the heat-conducting property of the graphene film prepared by the oxidation-reduction method, and fully exerts the intrinsic characteristics of the graphene material, so that the graphene film has higher market competitiveness.

The invention discloses a composite cable containing an electromagnetic shielding material and a manufacturing method thereof, the composite cable containing the electromagnetic shielding material comprises an insulating sheath, a conductive wire core and a shielding layer, the insulating sheath wraps the conductive wire core, the shielding layer is embedded in the insulating sheath, the shielding layer comprises a semiconductor and graphene, and the semiconductor and the graphene are arranged in the insulating sheath. A strip-shaped semiconductor is heated to a molten state in a smelting furnace, the surface of the molten semiconductor is coated with graphene, shielding bodies of the semiconductor and the graphene are obtained through cooling, every two shielding bodies form a spatial double-helix structure, and the multiple shielding bodies are woven to form a woven belt-shaped structure. A method for manufacturing the composite cable comprises the following steps: combining the graphene wire core with the metal copper core to obtain the conductive wire core; and then an inner insulating layer, a heat dissipation layer, a shielding layer, a waterproof layer and an outer insulating layer are sequentially coated on the conductive wire core. The semiconductor and the graphene are woven on the periphery of the conductive wire core to form a barrier of a double-helix structure, the effect of isolating a magnetic field is achieved, and the electromagnetic shielding performance is improved.

The invention discloses a hydrogel dust suppressant for coal storage and transportation as well as a preparation method and application thereof, and belongs to the technical field of dust suppression. The hydrogel dust suppressant for coal storage and transportation comprises the following components in parts by mass: 1-20 parts of a film-forming agent, 0.5-5 parts of a film-forming auxiliary agent, 0.5-15 parts of a thickening agent, 100-300 parts of a functional monomer, 20-50 parts of a neutralizing agent, 0.5-5 parts of a cross-linking agent, 0.5-5 parts of an initiator and 3-30 parts of a surfactant. The prepared hydrogel dust suppressant for coal storage and transportation has excellent film-forming property and cohesiveness, and dust flying in the coal transportation process is effectively inhibited. In addition, the prepared dust suppressant for coal storage and transportation is low in synthesis cost, the dilution multiple reaches up to 500 times, the transportation cost is greatly saved, the synthesis process is simple, the yield is high, and the dust suppressant is suitable for industrial production.

The present disclosure relates to an orthokeratology lens. The orthokeratology lens has a posterior surface for shaping the anterior surface of the cornea, the posterior surface having a base arc region and a reverse arc region. The curvature radius of the base arc area is gradually reduced from the center to the periphery; and / or the curvature radius of the reverse arc area is smaller than that of the base arc area and is gradually reduced from inside to outside. And / or the area with the preset width at the tail end of the base arc area is set as a transition arc area, and the curvature radius of the transition arc area is smaller than that of the base arc area and larger than that of the reverse arc area. Thus, the rear surface optical region can be lifted to increase the thickness of the central tear layer, so that the region is full of tear.

The invention discloses a preparation method of a battery aluminum foil and the battery aluminum foil. The preparation method comprises the following steps that S1, a raw material formula is prepared according to the following components in percentage by mass, and a casting process adopts a water-cooling semi-continuous casting method to prepare a cast ingot from the raw material formula; s2, the cast ingot is subjected to saw cutting and surface milling treatment; s3, the cast ingot subjected to saw cutting and surface milling treatment is put into a heating furnace to be subjected to homogenizing heat treatment; s4, the cast ingot is subjected to hot continuous rolling treatment; a hot-rolled coiled material is obtained; s5, the hot-rolled coiled material is subjected to cold rolling and intermediate annealing, and a cold-rolled blank is obtained; s6, the cold-rolled blank is cleaned, and a cold-rolled blank is obtained; and S7, the cold-rolled blank is subjected to foil rolling, and the battery aluminum foil with the thickness ranging from 0.01 mm to 0.015 mm is obtained. The prepared battery aluminum foil is excellent in comprehensive mechanical property, good in surface quality, low in pinhole density and low in belt breaking frequency.

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 provides a method for stably controlling the surface quality of a high-carbon steel continuous casting billet, which comprises the following steps: high-carbon steel refined molten steel is poured, and the superheat degree of a tundish of the high-carbon steel refined molten steel is 10-25 DEG C; casting powder is added after steel drawing; the pulling speed of the casting is 0.85 to 1.30 m / min; and the high-carbon steel continuous casting billet obtained through pouring is cooled. According to the method for stabilizing the surface quality of the high-carbon steel continuous casting billet, through optimization and adjustment of a production process and cooperation with special casting powder, process parameters such as the pulling speed, the superheat degree and the one-cooling-water slow cooling mode special for the high-carbon steel are formulated, the quality stability of the high-carbon steel is effectively improved, and the percent of pass of the casting billet is increased.

The utility model discloses a connecting structure of a cover plate and a cathode collector plate and a cylindrical battery, the cover plate is provided with a micro boss which slightly protrudes towards the inside of the battery, the top end of the micro boss is a platform, the middle part of the cathode collector plate is provided with an annular second nick, and the platform is welded with the inner side area of the second nick. In the application, the cover plate is provided with a structure slightly protruding towards the inside of the battery, the top end of the slightly-protruding structure is provided with a plane platform, the cover plate is externally welded with the inner ring of the collector plate through the plane platform, the inner ring of the collector plate is provided with a circle of nicks, and the welding area of the cover plate and the collector plate is in the nicks, so that when the internal pressure of the battery exceeds a certain value, the slightly-protruding surface of the cover plate rotates reversely, and the nick weak area of the collector plate is torn; therefore, the positive electrode and the negative electrode of the battery are disconnected, and battery explosion caused by external short circuit is avoided.

The invention discloses a silicon substrate gallium nitride wafer containing a large mismatch stress regulation and control structure and a preparation method and application thereof, and relates to the technical field of semiconductor materials. The silicon substrate gallium nitride wafer containing the large mismatch stress regulation and control structure is formed by stacking a silicon substrate, an aluminum nitride amorphous film barrier layer, an ultrathin porous aluminum oxide weak bonding decoupling layer, an aluminum nitride single crystal film nucleating layer template layer and a gallium nitride single crystal film quality improvement layer in sequence. According to the invention, by regulating and controlling the pore size and pore density in the ultrathin porous alumina weak bonding and decoupling layer, the weak bonding and decoupling effect of the aluminum nitride single crystal film nucleating layer template layer on the ultrathin porous alumina weak bonding and decoupling layer is regulated and controlled; and therefore, large mismatch stress regulation and control of the silicon substrate gallium nitride material are realized, and the crack-free thickness, the material crystallization quality and the material preparation efficiency are improved. The silicon substrate gallium nitride wafer containing the large mismatch stress regulation and control structure can be applied to development and production of gallium nitride-based power electronic devices, microwave radio frequency devices and optoelectronic devices.

The invention relates to the technical field of biomass gasification furnaces, and discloses a downdraft biomass gasification furnace which comprises a support and a gasification furnace sensor, a fire grate segment set is arranged at the top of the support and comprises an upper fire grate segment, a middle fire grate segment and a lower fire grate segment, and the upper fire grate segment, the middle fire grate segment and the lower fire grate segment are arranged on the support. The upper fire grate segment, the middle fire grate segment and the lower fire grate segment each comprise a plurality of fixed fire grate segments and a plurality of movable fire grate segments, and the fixed fire grate segments and the movable fire grate segments are alternately arranged. According to the invention, the plurality of hydraulic rods are used for detecting the reaction intensity of each section according to the gasification furnace sensor to control the material pushing frequency of different sections in the gasification furnace in a segmented manner, and the arrangement number of the upper fire grate segment, the middle fire grate segment and the lower fire grate segment corresponding to the ventilation holes in the single fire grate segment is reduced; the staying time of the material layer in different sections is matched with the reaction intensity, and the water tank synchronously adjusts the cooling rate and the gas inlet amount of the gasifying agent during adjustment in cooperation with the adjusting mechanism, so that the gas conveying quality of the gasification furnace is guaranteed.

The negative electrode material comprises a core body and a coating layer coating at least part of the surface of the core body, the core body comprises a base body and an active substance arranged on the base body, the protection strength of the coating layer is defined as gamma, gamma = 0.0129 T0-0.323, gamma is greater than or equal to 4 and less than or equal to 9, T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis, T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis, and T0 is the initial temperature of mass increase of the negative electrode material in thermogravimetric analysis. The thermogravimetric analysis comprises the step of determining the quality of the negative electrode material in an oxygen atmosphere; the negative electrode material further comprises an oxygen element, the atomic percent content of the oxygen element at any position, away from the interior of the negative electrode material by X, of the surface of the negative electrode material is defined as Px, X is larger than or equal to 60 nm and smaller than or equal to 160 nm, and Px is larger than or equal to 2 and smaller than or equal to 8.