109results about How to "Improve homogeneity" patented technology

The invention relates to a heart organoid and an in-vitro preparation method thereof, and belongs to the technical field of stem cells. The invention provides a heart organoid. The heart organoid is obtained by induced culture of an adherent pluripotent stem cell mass; the adherent pluripotent stem cell mass is obtained by adherent culture of a suspended pluripotent stem cell mass; the suspension pluripotent stem cell mass is obtained by suspension culture of pluripotent stem cells. According to the in-vitro preparation process of the heart organoid, after pluripotent stem cells form balls, the pluripotent stem cell balls are subjected to staged induced differentiation under adherent culture, so that cell subtypes such as epicardial cells and the like can be generated without additional addition or additional stimulation of signal channels, and the heart organoid is more homogeneous. The self-occurring multi-lineage coexisting heart organoid can better simulate biological events derived from multiple cell types and multiple cell subtypes in the early development process of an embryonic heart, and has great application prospects in exploration of pathogenic factors and potential treatment targets of congenital heart diseases.

The present invention separates and purifies chitosan in shrimp by-products, and then prepares chitosan / collagen / plant essential oil multilayer nano composite microsphere emulsion, which is applied to sunscreen skin care products. The plant essential oil has sunscreen effect, chitosan has antibacterial and anti-inflammatory properties, and collagen can repair damaged skin. By controlling the extraction and purification process of chitosan, the molecular weight of chitosan is controlled, the homogeneity of chitosan is improved, and the antibacterial property of chitosan is improved. Through the form of multilayer nano composite microsphere emulsion, the plant essential oil is protected, the volatilization of the plant essential oil is reduced; the release rate of the plant essential oil is controlled, and a slow release effect is produced; the particle size of the effective ingredient is smaller and easier to be absorbed by the skin; at the same time, a component with waterproof performance is added to the sunscreen cosmetics, so that the sunscreen skin care products of the present invention have excellent sunscreen effect and waterproof performance.

The invention relates to the technical field of 3D printing building materials, in particular to a 3D printing geopolymer composite material with low drying shrinkage and a preparation method thereof.The 3D printing geopolymer composite material is prepared from, by mass, 400 parts of slag powder, 320 parts of fly ash, 80 parts of steel slag micro powder, 1200 parts of quartz sand, 5.1-25.6 parts of sodium hydroxide, 46.4-66.9 parts of sodium silicate, 8 parts of barium chloride and 296 parts of water. The preparation method comprises the following steps: fully mixing the slag powder, the fly ash, the steel slag micro-powder and the quartz sand according to a preset mass ratio to obtain a uniform basic powder mixture; adding an alkali activator and barium chloride into the basic powder mixture, and continuously mixing until the mixture is uniform to obtain a first mixture; and adding water into the first mixture according to a preset water-binder ratio, and carrying out stirring treatment according to a preset stirring method to obtain the 3D printing geopolymer composite material with low drying shrinkage. According to the invention, the drying shrinkage can be reduced.

The invention relates to the technical field of metallurgy, in particular to a production method for reducing casting blank cracks, which comprises the following procedures: (1) pre-desulfurizing molten iron; (2) smelting in a converter; (3) LF refining; (4) RH refining; (5) slab continuous casting; and (6) hot charging and rolling. By optimizing the chemical components and the mass percentage of the continuous casting billet and regulating and controlling the technological parameters of multiple procedures such as converter smelting, LF refining, RH refining, slab continuous casting and hot charging rolling, the austenite grain size in the microstructure of the surface layer of the continuous casting billet is refined, the high-temperature plasticity of the continuous casting billet is improved, and cracks on the surface of the continuous casting billet are reduced.

The invention discloses a car bottom type carbon roasting furnace, which belongs to the technical field of heat treatment furnaces, and comprises a furnace car and a fixed furnace body arranged above the furnace car, the top of the fixed furnace body is provided with a circulating fan, the left side of the circulating fan is provided with a spraying device, and the two sides of the circulating fan are provided with a plurality of combustion nozzles side by side. A smoke exhaust pipeline for exhausting smoke is arranged at the tail part of the fixed furnace body; a heat preservation and insulation module is further arranged in the fixed furnace body. A furnace door and a water-cooling door frame are arranged on the front portion of the fixed furnace body. According to the invention, a smoke combustion mode of saggar-exhaust pipe-storage tank-combustor is completely abandoned, and a mode of discharging smoke volatile matter to the incinerator for direct combustion is adopted, so that the comprehensive energy consumption is below 3.6 * 10 < 6 > kJ, and the energy consumption level of a domestic ring type roasting furnace is completely reached. Meanwhile, the gas leakage amount is extremely small, the temperature distribution in the furnace is uniform, the product homogeneity is good, and operation automation, temperature control precision, fuel utilization maximization and finished product high normalization are achieved.

The invention provides a carbon fiber reinforced silicon carbide ceramic and a preparation method thereof, and belongs to the technical field of silicon carbide ceramics. The preparation method comprises the following steps: preparing functional carbon fibers, preparing modified silicon carbide microspheres, preparing a mixture, forming and calcining. The preparation method of the modified silicon carbide microspheres comprises the following steps: putting silicon carbide into an ethanol solution, adding sodium dodecyl amino propionate, carrying out ball milling treatment, and after ball milling is finished, filtering out and drying to obtain ball-milled silicon carbide; placing ball-milled silicon carbide in dimethyl sulfoxide, uniformly stirring, adding modified sodium alginate and hydroxyethyl cellulose, heating to 70-74 DEG C, adding tetrabutylammonium bromide, carrying out heat preservation reaction for 10.0-11.5 hours, and after the reaction is finished, filtering, washing and drying to obtain modified silicon carbide microspheres; the prepared ceramic product is high in strength performance and toughness, low in thermal expansion coefficient and excellent in high-temperature oxidation resistance.

The invention relates to the technical field of concrete, and discloses high-strength concrete and a preparation method thereof. The concrete comprises the following components: 800 to 850 parts of cement, 150 to 160 parts of glass beads, 100 to 120 parts of mineral powder, 80 to 100 parts of silica fume, 900 to 950 parts of fine aggregate, 8 to 10 parts of a water reducing agent, 10 to 15 parts of chitosan, 20 to 25 parts of acrylamide, 1 to 2 parts of an initiator, 5 to 6 parts of a coupling agent, 1 to 2 parts of a cross-linking agent, 1 to 2 parts of nano silver oxide, 200 to 210 parts of water and 50 to 60 parts of an acetic acid solution. Chitosan and acrylamide are copolymerized to obtain a polyhydroxy copolymer with a three-dimensional network structure, so that the strength of the concrete is improved; the nano silver oxide is loaded on the three-dimensional network copolymer, the nano silver oxide has excellent antibacterial performance, polyhydroxy on the copolymer structure has good oxidability and reducibility, and the antibacterial ability of the silver oxide is synergistically promoted. The concrete prepared by the preparation method disclosed by the invention keeps high strength while having excellent antibacterial ability.

The preparation method comprises the following steps: uniformly stirring steel slag and tailings according to a mass ratio of (2-3): (7-8) at a high speed, adding water, continuously stirring to obtain a turbid solution, slowly adding sodium silicate into the turbid solution under high-speed stirring to obtain a mixed solution, simultaneously dropwise adding a water reducing agent and a thickening agent into the mixed solution under stirring, and uniformly stirring to obtain a slurry; and finally, carrying out a slump test on the mixture, and determining the addition amount of silica gel or water according to a test result, so as to obtain the flow-state solidified soil based on the large-particle waste residues. According to the method, through the innovative material ratio and preparation process, the stirring and pumping performance of the large-particle material is improved, the segregation risk is reduced, the homogeneity and stability of the fluid-state solidified soil are improved, meanwhile, the production cost is reduced, batch consumption of a large amount of solid waste is achieved, and the problem that use of the large-particle material in traditional fluid-state solidified soil is limited is solved.

The invention provides a modified polypropylene material and application thereof in a corrugated pipe, and belongs to the technical field of polypropylene materials. The modified polypropylene material is prepared from the following components in parts by weight: 98 to 103 parts of polypropylene, 10.5 to 10.8 parts of a functional compound, 1.0 to 1.4 parts of an antioxidant, 1.3 to 1.6 parts of a mixing auxiliary agent and 0.5 to 1.0 part of dimethyl silicone oil, the preparation method of the functional compound comprises the steps of bamboo fiber modification, maleic anhydride modification, aluminum oxide epoxidation and compounding. The compounding comprises the following steps: adding epoxidized aluminum oxide into tetrahydrofuran, and uniformly stirring to obtain a mixed solution I; adding maleic anhydride modified bamboo fibers into tetrahydrofuran, and uniformly stirring to obtain a mixed solution II; the second mixed solution is slowly added into the first mixed solution, the adding rate is controlled to be 3.8-4.2 g / min, after adding is completed, triethylamine is added and stirred to be uniform, the temperature is increased to 80-84 DEG C, stirring reaction is conducted for 5.8-6.2 h, after reaction is completed, filtering, washing and drying are conducted, and a functional compound is prepared; the polypropylene material disclosed by the invention is good in impact resistance, high in mechanical strength and excellent in low-temperature resistance and corrosion resistance.

The present invention provides a device and method for removing hardness from industrial wastewater, and relates to the technical field of removing hardness from industrial wastewater, comprising a tank body, the inner surface of the tank body is rotatably connected to a first rotating rod through a bearing, the surface of the first rotating rod is rotatably connected to a bent rod through a bearing, the surface of the bent rod is fixedly connected to a rocking plate, the surface of the rocking plate is rotatably connected to a positioning rod through a universal joint bearing, the surface of the positioning rod is slidably connected to a lifting frame, the upper surface of the bent rod is fixedly connected to a screw rod, the surface of the screw rod is threadedly connected to a threaded barrel, the lifting frame is fixedly connected to the threaded barrel, the present invention drives the rotating frame to rotate through a first gear ring, the rotating frame drives the stirring blade to rotate through a rotating rod, at this time, the internal wastewater can be stirred, and the stirring can promote sufficient contact between the industrial wastewater and the reagent, thereby accelerating the reaction rate and improving the overall treatment efficiency.

The utility model relates to the technical field of food processing, and discloses a homogenizing and mixing device for food processing, which comprises a homogenizing and mixing cylinder, the upper end of the inner wall of the homogenizing and mixing cylinder is in threaded connection with a homogenizing and mixing mechanism, the top of the homogenizing and mixing mechanism is fixedly provided with a mounting cover, and the homogenizing and mixing mechanism comprises a servo motor. The top of the servo motor is fixedly connected with the top of the inner wall of the mounting cover, a driving assembly is fixedly mounted at the output end of the servo motor, and the homogenizing and stirring mechanism is arranged and can drive stirring blades and a homogenizing device to rotate at the same time through the single servo motor; therefore, the powdery raw materials in the homogenizing and powder stirring cylinder are homogenized and stirred, the equipment cost of the whole device is reduced, the equipment mounting space is reduced, the single homogenizing and stirring amount of the powdery raw materials is increased, and the stirring efficiency of the whole device is improved.

A high-strength refractory material and its preparation method and application, belonging to the technical field of refractory materials, the raw materials of the refractory material include fused corundum, high-alumina bauxite clinker, metal silicon powder, anti-cracking agent, titanium aluminum carbide and titanium carbide, etc., wherein the anti-cracking agent is prepared by modifying boron phenolic resin, mesophase asphalt, artificial graphite powder and silicon carbide fiber. The refractory material of the present invention adopts metal silicon powder to improve wear resistance and oxidation resistance, titanium aluminum carbide to improve oxidation resistance, titanium carbide to improve strength, and anti-cracking agent after surface modification and film formation to greatly improve thermal shock resistance and reduce thermal expansion rate and slag erosion rate. In addition, adding titanium aluminum carbide can improve strength and thermal shock resistance to a certain extent, has good oxidation resistance, and improves erosion resistance. The refractory material can be used for high carbon steel and low carbon steel, and is particularly suitable for casting high oxygen steel, calcium treated steel and high manganese steel.

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The invention relates to the technical field of preparation of concrete additives, in particular to a high polymer material for reducing springback of tunnel sprayed concrete and a preparation method of the high polymer material. The high polymer material for reducing the springback of the tunnel sprayed concrete is halloysite nanotube modified fiber, and the halloysite nanotube modified fiber is prepared from the following raw materials: cellulose, a basic catalyst, a surface modifier, halloysite nanotubes and a solvent, the surface modifier comprises a waterborne polyurethane emulsion, and polyurethane latex in the waterborne polyurethane emulsion is terminated by hydroxyethyl acrylate; the halloysite nanotube is subjected to surface amino acid treatment or amino silane treatment. According to the invention, the overall adhesion capacity of the concrete can be improved, the rebound loss of the concrete in the wet spraying process is reduced, the generation of a hydration heat peak value can be delayed, the homogeneity of the concrete is improved, early plastic cracks and shrinkage cracks are effectively inhibited, and the improvement of the quality and safety of a tunnel structure is facilitated.

The invention provides a preparation method of isostatic pressing graphite with a superfine structure, belongs to the technical field of preparation of isostatic pressing graphite, and aims to solve the technical problem that the product reliability is influenced due to low dispersion efficiency and easy agglomeration of graphene in the existing one-step mixing. The method comprises the following steps: step S1, aggregate preparation; s2, gradient mixing: adding graphene accounting for 1-3% of the total weight of the basic aggregate into the basic aggregate, mixing by adopting a gradient mixing method, premixing the basic aggregate accounting for 40-60% of the total weight with all graphene to prepare a master batch, and finally mixing the master batch with the residual basic aggregate to obtain a composite reinforced aggregate; step S3, mixing and kneading; step S4, powder pressing; step S5, isostatic pressing molding; step S6, roasting; and step S7, graphitizing. According to the preparation method, a gradient mixing method is adopted, so that the enhancement effect of the graphene can be fully exerted, and the problems that the graphene is easy to agglomerate and is difficult to uniformly disperse in the micron powder are effectively solved through a step-by-step dilution mechanism.

The application discloses a kind of based on graph structure enhancement's graph neural network method, belong to graph data analysis and graph representation learning technical field, specific steps are as follows: collect original graph structure data, and mark;Graph structure data is encoded by encoder, and preliminary node representation is obtained, preliminary node representation is reduced dimension by graph neural network, and low-dimensional node representation is obtained;And generate enhanced graph adjacency matrix;Repeat step S2 and step S3 until high homogeneity graph adjacency matrix is obtained;High homogeneity graph adjacency matrix, original graph adjacency matrix and low-dimensional node representation are input to encoder to carry out node classification task.The above-mentioned one based on graph structure enhancement's graph neural network method, low homogeneity graph is converted into high homogeneity graph, so that graph data is better adapted to existing graph neural network, improves the node classification performance in low homogeneity graph data, so that node classification task can be better carried out.

The present invention relates to an evaluation method, system and electronic equipment for the anti-penetration performance of cement-based materials, and belongs to the field of computational materials science and technology. The method comprises: performing ultrasonic detection on a plurality of cement-based materials, respectively obtaining the propagation speed of ultrasonic waves in different cement-based materials; detecting the normalized penetration depth and the opening diameter of cement-based materials; establishing a correlation equation between the ultrasonic propagation speed and the normalized penetration depth / opening diameter; substituting the ultrasonic propagation speed of the cement-based material to be evaluated into the correlation equation, and calculating its normalized penetration depth and opening diameter. The characterization system established by the present invention can accurately evaluate the anti-penetration performance of cement-based materials with different material compositions and different compressive strengths. Compared with traditional penetration experiments, the detection method can quickly and accurately evaluate the anti-penetration performance of cement-based materials of unknown components, and since it basically does not damage the test blocks, it can also greatly improve the accuracy and repeatability of the test.

The utility model provides a water phase homogenizing tank for honey mustard sauce production, which relates to the technical field of water phase homogenizing tanks and comprises a tank body and a shaft rod, a hollow interlayer is arranged on the inner wall of the tank body, an electric heating device capable of heating the inside of the tank body is arranged in the hollow interlayer, an auxiliary device is arranged at the top end of the tank body, and the shaft rod is arranged on the shaft rod. The auxiliary device comprises a half gear and a horizontal gear, the horizontal gear is fixed at the top end of the tank body through a rotating shaft, the shaft rod can drive the pressure plate to move up and down in the tank body when rotating by means of meshing of the half gear and the horizontal gear, pressure is applied to the interior of the tank body through the pressure plate, and the pressure plate is driven to move up and down. According to the water-phase homogenizing tank, the flowing state of fluid in the tank body is changed, so that the relative movement between liquid layers is more violent, the turbulence degree is enhanced, the dissolving process is accelerated, layering of materials in the stirring process is avoided as much as possible, and the effect and efficiency of the water-phase homogenizing tank during material treatment are greatly improved.

This invention provides a sandwiched pressure hull structure and its processing method, relating to an underwater vehicle structure, including an inner hull, an outer hull, and an intermediate sandwich layer located between the inner and outer hulls. The intermediate sandwich layer includes hollow glass microspheres, reinforcing fibers, and epoxy resin. The spherical hollow glass microspheres and reinforcing fibers are uniformly mixed in the epoxy resin and placed in a fluidized state between the inner and outer hulls. After vacuum curing, they form a buoyancy material located between the inner and outer hulls. This invention addresses the problems of insufficient load-bearing capacity and low specific strength and specific stiffness of the pressure hulls of underwater vehicles in the prior art.

The in-situ dual-axis three-stage soil remediation device includes a vehicle body, chassis, tracked walking device, cab, power system, hydraulic station, lifting frame, and dual-axis soil breaking and mixing three-stage drilling device. The cab is located at the front left of the vehicle body, the power system is located at the rear of the vehicle body, the hydraulic station is located on the left side of the vehicle body, and the lifting frame is located at the upper-middle front of the vehicle body. The dual-axis soil breaking and mixing three-stage drilling device is mounted on the lifting frame. The power system provides power to the tracked walking device and hydraulic station through a power reduction gearbox, and the hydraulic station provides hydraulic power to the lifting frame and the dual-axis soil breaking and mixing three-stage drilling device. This invention uses a three-stage drill bit that integrates breaking and mixing, which can effectively scan and break soil particles layer by layer and fully mix the soil and chemical particles. Dual-axis operation allows for two soil remediation operations to be performed at the same time, effectively improving work efficiency, reducing operation frequency, and reducing energy consumption.

The application provides a manufacturing method of a circuit board connection structure with a high-length copper column. The first copper column, the second copper column and the third copper column are manufactured respectively, and the high-length copper column is manufactured by splicing the first copper column, the second copper column and the third copper column, so as to reduce the problem of empty package or gap of the high-length copper column in the manufacturing process, improve the homogeneity of the high-length copper column, and further improve the stability of signal transmission between the to-be-connected component and the first conductive circuit layer. The application also provides a circuit board connection structure with a high-length copper column manufactured by the method.

The utility model discloses a double-helix stirring device for uniformly dispersing concrete conductive components, which comprises a stirring barrel, a protective cover is movably mounted at the top of the stirring barrel, a protective shell is fixedly mounted at the top of the protective cover, a stirring component is arranged in the protective shell, and the stirring component is arranged in the protective shell. And scrapers are symmetrically and fixedly mounted on the two sides of the stirring assembly. According to the double-helix stirring device for uniformly dispersing the conductive components of the concrete, through the arrangement of the stirring assembly, the packing auger and the scraping plate, a stirring structure in the scheme adopts coaxial bidirectional stirring, so that stirring is more uniform, the stirring device can drive the packing auger and the scraping plate to rotate, the scraping plate can clean the conductive components on the inner wall of the stirring barrel, and the stirring efficiency is improved. A large amount of conductive components on the inner wall of the stirring barrel body are prevented from influencing use, the auger can be used for conveying and feeding the conductive components, the interior of the discharging pipe can be effectively prevented from being blocked, and the use effect of the double-helix stirring device is improved.

The utility model relates to the technical field of cordyceps sinensis powder production, and discloses a filtering and screening device for cordyceps sinensis powder production, which comprises a screening box, a fixing frame is slidably connected in the screening box, a screening frame is arranged in the fixing frame, and mounting blocks are slidably connected to two sides in the screening frame. The upper portions of the multiple mounting blocks are fixedly connected with moving blocks, the upper portions of the multiple moving blocks are fixedly connected with handles, the periphery of the upper portion of the fixing frame is fixedly connected with fixing boxes, the interiors of the multiple fixing boxes are slidably connected with circular plates, and the upper portions of the multiple circular plates are fixedly connected with one ends of circular rods. And the other ends of the plurality of round rods are fixedly connected with pulling plates. According to the cordyceps sinensis powder screening device, the screen frame can be conveniently detached, the screen frame can be conveniently and thoroughly cleaned, cross contamination is avoided, cordyceps sinensis powder can be effectively filtered and screened, and the homogeneity and stability of products are improved.

This invention belongs to the field of food sampling technology, specifically a food crushing and homogenizing machine and its control method. The food crushing and homogenizing machine provided by this invention includes: a base; several sets of first crushing and homogenizing components mounted on the base, each set of first crushing and homogenizing components including a first driver, a first cutter, and a first container, the output end of the first driver being connected to the first cutter, the first cutter being located inside the container; several sets of second crushing and homogenizing components mounted on the base, each second crushing and homogenizing component including a second cutter and a second container, the output end of a second motor being connected to the second cutter, the second cutter being located inside the second container; the capacity of the first container being greater than the capacity of the second container; and a control device electrically connected to each of the first and second crushing and homogenizing components. This invention can significantly improve the efficiency of food crushing and homogenizing.

The present invention belongs to the field of heat treatment of steel materials, and is particularly a quenching heat treatment method for improving the homogeneity of the structure and fatigue life of high carbon chromium bearing steel. The method is suitable for solving the problem that after quenching and tempering heat treatment of high carbon chromium bearing steel, carbides, grains and residual austenite are unevenly distributed, resulting in large deformation of the workpiece, poor hardness uniformity, and low or unstable toughness and fatigue life. The present invention reasonably designs the parameters of the quenching heating process according to the tissue state parameters before quenching, changes the stress release, carbide precipitation and austenitization driving force of the high carbon chromium bearing steel, and thus reduces the problem of uneven parameters of the quenched structure (such as: carbide, residual austenite size and distribution, etc.) on a microscopic scale, and then performs tempering treatment according to the original or appropriately adjusted low temperature tempering (and necessary deep cryogenic treatment) heat treatment process, thereby significantly improving the deformation, hardness uniformity, toughness and fatigue performance stability of the high carbon chromium bearing steel workpiece.

The present invention describes a protein-drug conjugate based on the IgG1-Fc domain of an antibody, a preparation method and an application. The conjugate comprises a small molecule targeting ligand, a toxic drug warhead and an Fc domain protein of IgG1, and a tumor-targeting protein-drug conjugate is formed by coupling the ligand and the drug warhead to the N-terminus of the Fc protein. The present invention discloses the structure, preparation method and therapeutic use of an Fc protein-drug conjugate. The present invention fuses SMDC and the Fc domain of an antibody to obtain an antibody-drug conjugate structure-eADC. The natural pharmacokinetic advantages of antibody molecules are utilized to make up for the short half-life of small molecule drug conjugates, and the effect of "1+1>2" is achieved by taking advantage of each other's strengths and weaknesses.

The application provides a high-efficiency vertical lifting type stirring mixer and a use method, relates to the field of stirring mixing equipment, and comprises a U-shaped base. Two sides of the top of the U-shaped base are respectively fixed with a rack column and a sliding rail column. The top of the rack column and the sliding rail column is fixed with a top frame. The head of the top frame is rotatably installed with a stirring main shaft through a bearing seat. The top end of the stirring main shaft is connected with a stirring power device. The bottom end of the stirring main shaft is installed with a three-arm stirring frame. The three-arm stirring frame is installed with a stirring paddle assembly for stirring. The sliding rail column is slidably installed with a lifting support. The lifting support and the U-shaped base are installed with a lifting power device. The lifting support is used for positioning and placing a stirring cylinder. The stirring cylinder is located directly below the stirring paddle assembly. The mixer can be used for stirring concrete raw materials in the process of small-batch concrete test block production. Automatic stirring paddles are adopted to realize sufficient stirring of the concrete.

The utility model provides a novel perianal postoperative application relates to dressing technical field, including dressing body, the tower shape pad of multilayer is sewed in proper order on the dressing body, the tower shape pad includes cladding, pull lining and deformation filler, the pull lining includes the bending part and a plurality of stretch strips of integrated molding, the stretch strip is covered outside deformation filler, the both sides of cladding are equipped with the stretch hole, the stretch strip slips through the stretch hole, the bending part is connected with the stretch strip between next layer and links together, the upper side of link together is provided with a plurality of sliding holes, the stretch strip end part of the last layer is provided with the connecting band, the connecting band is fixed with the stretch adhesive tape, the stretch adhesive tape is bonded in the upper side of dressing body, the end part of stretch strip is provided with the folding part, the folding part slips around and is equipped in the sliding hole. In the utility model, the connecting band is pulled to two sides, and the multilayer tower shape pad can be deformed into tower type structure, and the operation is simple and quick.

A human interleukin 2-polyethylene glycol conjugate and use thereof. The human interleukin 2-polyethylene glycol conjugate comprises a recombinant human interleukin 2 containing at least one unnatural amino acid and PEG coupled to the at least one unnatural amino acid. The unnatural amino acid is a compound containing a carbonyl terminal group and having a structure as shown in formula (I) or an enantiomer thereof, and the PEG is coupled to the at least one unnatural amino acid by forming an oxime bond between the carbonyl terminal group and the PEG containing a hydroxylamine terminal group. The human interleukin 2-polyethylene glycol conjugate can be used individually or in combination with other anti-tumor drugs for the treatment of diseases such as solid tumors and hematologic tumors.

The application discloses a prebaked anode, characterized in that the raw material for preparing the prebaked anode comprises aggregate and binder, wherein the aggregate comprises calcined petroleum coke and / or coal-based coke, and the binder comprises low-ash high-caking bituminous coal. The prebaked anode product prepared according to the application has better homogeneity and better product performance, the raw material source of the prebaked anode is expanded, and the dependence of the prebaked anode raw material on petroleum coke and coal pitch is reduced.