161 results about "Low temperature treatment" patented technology

The invention discloses a pennisetum purpureum gene PpbHLH148L and application thereof in improving the cold resistance of plants, and relates to the technical field of gene engineering. The nucleotide sequence of the gene is as shown in SEQ ID NO.5. After the gene is subjected to subcellular localization and expression condition analysis after cold stress, the gene is related to low-temperature tolerance. An overexpression vector of the gene is constructed, Agrobacterium tumefaciens is transferred, then Arabidopsis thaliana infection is carried out, cold tolerance determination is carried out on overexpressed Arabidopsis thaliana, phenotypic difference and physiological index difference between an overexpressed strain after cold treatment and a wild type are observed, and it is found that the gene can significantly improve the low-temperature stress tolerance of Arabidopsis thaliana. And in the low-temperature treatment of the pennisetum alopecuroides transgenic callus, the transgenic callus also shows higher tolerance than the wild callus at low temperature. The pennisetum purpureum gene PpbHLH148L can be used for low-temperature tolerance modification of plants, and has an application prospect in creation of low-temperature-resistant plant materials.

The invention provides the cassava low-temperature-resistant MeSR45-2 gene cloned from cassava for the first time, the expression of the MeSR45-2 gene in cassava is inhibited under low-temperature stress, and research shows that the gene can significantly improve the low-temperature resistance of cassava, reduce the malondialdehyde content, proline cumulant and the like in cassava, reduce leaf damage under low-temperature treatment and improve the yield of cassava. Terminal buds under low-temperature treatment are not affected and can normally grow, and expression of various protein genes is regulated and controlled. The invention provides a new candidate gene for research on improvement of plant low temperature resistance and the like, and also provides a new gene resource for cultivation of a new variety of low temperature resistant cassava and construction of a new variety of transgenic cassava.

The invention discloses a paper composite filter material for reducing hydrocyanic acid and crotonaldehyde and a preparation method and application thereof, and the preparation method comprises the following steps: adding a gelator into a solvent to form a gelator solution; transferring the gelator solution into a liquid storage tank of an intaglio printing device, and printing and coating the gelator solution in the liquid storage tank onto a paper base material by using an anilox roller; the coated paper base material is conveyed to a low-temperature tunnel, so that nanofibers of a three-dimensional network structure are formed inside and on the surface of the paper base material in a self-assembly mode; and transferring the paper base material subjected to low-temperature treatment to a drying cylinder, and drying to obtain the paper composite filter material. According to the prepared paper composite filter material, the specific surface area in contact with smoke can be increased, the paper composite filter material can make full contact with the smoke in the process that the smoke passes through a filter stick, the interception capacity of the paper filter stick on hydrocyanic acid and crotonaldehyde in mainstream smoke of cigarettes is improved through amino and carboxyl groups on the surfaces of the nanofibers, and the sensory quality of the cigarettes with the paper filter stick is improved.

The present application belongs to the technical field of regeneration of oil-containing activated carbon, specifically a method for regenerating oil-containing activated carbon, comprising the following steps: mixing the oil-containing activated carbon with a surfactant, and then subjecting the mixture to ultrasonic treatment to obtain a first oil-containing activated carbon; extracting the first oil-containing activated carbon with supercritical carbon dioxide to obtain a second oil-containing activated carbon and a first oil component, and recovering the first oil component; treating the second oil-containing activated carbon with microwaves to obtain regenerated activated carbon and a second oil component, and recovering the second oil component. The method of the present application adopts a low-temperature treatment process throughout the entire process to avoid high temperature-induced structural damage to the activated carbon, resulting in a low coking rate and significant energy savings; oil resource recovery is achieved through supercritical carbon dioxide extraction and microwave desorption of the oil component, and no harmful substances are generated during the process; a multi-stage regeneration process can effectively desorb the oil in the oil-containing activated carbon, and the activated carbon adsorption capacity recovery rate after regeneration is high, with low energy consumption.

The application discloses a kind of composite mycelium imitation leather materials and preparation method thereof, and relates to the technical field of composite materials.The preparation method comprises the following steps: homogenizing mycelium to form mycelium paste, then mixing the mycelium paste with modified polyvinyl alcohol solution to obtain a mixture, adding glycerol, stirring uniformly, pouring into a mold after the elimination of bubbles, and after low-temperature treatment and drying treatment, the mycelium material is stripped from the mold to obtain the mycelium imitation leather material;The mycelium is the mycelium of polypore family fungi.The preparation method has the advantages of high production efficiency, easy to scale, simple operation, short production cycle, etc.The composite mycelium imitation leather material prepared by the preparation method of the application has good mechanical properties, including high tensile strength, tear strength and flexibility, etc., which can fully meet the requirements of imitation leather products.

The utility model discloses a decommissioned potting power battery disassembling device and a decommissioned potting power battery disassembling system. The decommissioned potting power battery disassembling device comprises cutting equipment and folding equipment, the cutting equipment comprises a base, a fixed platform, a jacking air cylinder, a limiting piece, a sliding table module, a saw cutting motor and a saw blade. The limiting pieces and the jacking air cylinders are installed on the two sides of the fixed platform respectively, the limiting pieces correspond to the jacking air cylinders in a one-to-one mode, the battery pack side plates are located on the outer side of the platform open groove, and the glue pouring power battery pack module is located on the inner side of the platform open groove; the saw cutting motor drives the saw blade to rotate, and the sliding table module drives the saw blade to move along the platform slot to cut off the side plate of the battery pack; the folding equipment comprises a base, a sliding platform, a linear motor, a portal frame, a pressing oil cylinder and a stretching oil cylinder. By adopting the scheme of the utility model, a sol agent does not need to be filled, pollution to the environment is avoided, low-temperature treatment of the battery module is not needed, and relatively large potential safety hazards to the battery module are avoided.

The invention belongs to the technical field of preparation of nano silicon materials, and particularly relates to a method for preparing nano silicon by etching a silicon-aluminum alloy and a nano silicon material thereof. Comprising the following steps: placing a pretreated silicon-aluminum alloy sample wafer in an etching tank containing a main etching solution, etching under the action of an alternating pulse electric field and ultrasonic-megasonic coupling, and adjusting the pH value to 2.5-3.0 by using acetic acid; quickly washing the silicon-aluminum alloy sample wafer subjected to main etching, putting the silicon-aluminum alloy sample wafer into an electrolytic cell containing a composite buffer solution of oxalic acid and sulfuric acid, and performing electrochemical fine etching under a direct-current constant-voltage electric field; and when the etching current density is reduced to 10% of the initial value, the reaction is terminated, and after low-temperature treatment and low-temperature vacuum drying, the nano silicon material with the residual Al content of 8-12 wt% and the O / Si atomic ratio of 0.15-0.25 is obtained. According to the invention, the problems of out-of-control components, structural damage and serious pollution in the prior art are solved, and the nano silicon material with controllable residual aluminum element and low oxygen-silica ratio can be stably prepared.

The invention relates to the field of fermentation product extraction methods, in particular to a method for efficiently extracting intracellular products. According to the method, staged extraction and ultrasound are combined to be applied to intracellular product extraction, and the extraction rate can be obviously increased. After thalli in fermentation liquor are crushed, a non-polar solvent is adopted for first extraction, and ultrasonic short-time low-temperature treatment is adopted in the extraction process, so that the extraction efficiency of a target product can be obviously improved, a polar solvent is added into an extraction phase of the first extraction in second extraction, and ultrasonic short-time low-temperature treatment is performed again, so that the extraction amount of intracellular products is increased; the process does not need complex equipment, is short in operation time consumption and high in extraction efficiency, and is suitable for large-scale industrial production.

This invention relates to the technical field of cryogenic natural gas separation and discloses a pollution-free cryogenic natural gas separation and treatment device, including a treatment tank. A cryogenic tank is fixedly installed at the bottom of the inlet tank. A condenser pipe is installed on the inner wall of the installation groove. A liquid nitrogen pipe is inserted and connected to the upper part of one side of the outer wall of the treatment tank. A pressure sensor is installed on the upper part of one side of the treatment tank, and a temperature sensor is installed in the middle of one side of the treatment tank. In this invention, natural gas is introduced into the inlet tank for accumulation and cryogenic separation. Then, the liquefied liquid and natural gas fall directly into the cryogenic tank below. The condenser pipe is controlled by the compressor to start cooling, so that the cryogenic natural gas is further cryogenically processed. After the temperature sensor detects that the temperature remains constant on the outside, it controls the first and second electromagnetic sealing valves through wires to open them and perform gas-liquid separation, thereby improving the overall effect of natural gas separation of the equipment.

The invention relates to the technical field of sewage treatment, and particularly discloses a sewage treatment agent as well as a preparation method and application thereof. The sewage treatment agent comprises modified polyaluminum chloride, a low-temperature flocculant and a plurality of auxiliary components, the modified polyaluminum chloride is obtained by doping nano boron nitride and modifying with a low-temperature modifier, and the low-temperature flocculant is obtained by copolymerization of polyacrylamide and 2-acrylamide-2-methylpropanesulfonic acid; the preparation method mainly comprises the steps of raw material dissolution, mixing reaction, flocculation compounding and the like. The sewage treatment agent can be used for domestic sewage treatment in a low-temperature environment of 0-5 DEG C, has the advantages of excellent low-temperature resistance, high hydrolysis speed, high pollutant removal rate and good stability, and can effectively overcome the defect of poor low-temperature treatment effect of an existing agent.

The application provides a method for improving the adenosine content of Ophiocordyceps sinensis based on metabolic regulation and synergistic induction, wherein a metabolic intervention is performed on the larva and strain complex using a regulating agent during the infection period before low-temperature treatment to form the infected larva; first, deep low-temperature immobilization treatment is performed at 2-5 DEG C for 30-50 days, then culture is performed using a variable-temperature cycle with diurnal temperature difference during the stroma induction period, and mannitol is sprayed onto the surface of the culture medium at the beginning of the step; after harvesting, rapid temperature rising enzyme inactivation and drying treatment is performed on the harvested Ophiocordyceps sinensis, the rapid temperature rising enzyme inactivation and drying treatment comprises increasing the drying temperature from 40-45 DEG C to 60-70 DEG C within 30-45 minutes and maintaining the temperature until the moisture content is less than 10%. The application can solve the problem that the adenosine content is generally low in the existing full artificial cultivation technology, and can make the adenosine content of the full artificial cultivation Ophiocordyceps sinensis reach more than 0.020% (w / v), which is significantly better than the existing artificial cultivation level, and the product morphology is complete and the reproducibility is high.

The present invention relates to a method for promoting the chlorosis and coloration of regreening summer orange fruits, comprising the steps of: subjecting the regreening summer orange fruits to a cold shock treatment; and subjecting the cold-shocked regreening summer oranges to a low-temperature treatment for 5-7 days. The method of the present invention achieves chlorosis and coloration of regreening summer oranges by using only the cold shock and low-temperature treatment methods without the use of chemical reagents. The method is simple to operate, low-cost, safe and effective, and the treatment time is short, controlled within 5-7 days. This method provides theoretical guidance and technical support for improving the color quality of summer orange fruits and increasing the benefits for fruit growers.

This invention provides a method for synergistically preparing sterile liquid formulations using high-energy fluid milling and plant components, relating to the field of traditional Chinese medicine technology. The method involves subjecting medicinal plant raw materials to a first low-temperature treatment using high-energy fluid milling to obtain highly active functional components. These functional components are then mixed with a liquid formulation matrix and subjected to a second low-temperature treatment using high-energy fluid milling, simultaneously achieving homogenization and sterilization. This invention reveals for the first time a significant synergistic sterilization effect between the medicinal plant functional components prepared by a specific process and the high-energy fluid milling treatment. Complete microbial inactivation can be achieved under mild conditions of 120 MPa and below 50°C, with effects far exceeding the simple superposition of a single component and a single physical treatment. This invention provides an integrated homogenization-sterilization method for external preparations and natural beverages that eliminates the need for chemical preservatives and high-temperature sterilization, and has broad applicability in the fields of traditional Chinese medicine and food.

The invention discloses a rapid propagation rooting culture medium for peony seed tissue culture and a culture method, and belongs to the technical field of plant tissue culture. The rapid propagation rooting culture medium takes 1 / 2 MS as a basic culture medium, and further comprises the following components: ammonium nitrate, potassium nitrate, calcium chloride, magnesium sulfate, monopotassium phosphate, a carbon source, kinetin and a curing agent. By adding kinetin into the culture medium, dependence of peony seed tissue culture seedlings on low-temperature treatment is broken, low-temperature pretreatment necessary in a traditional method is avoided, the peony seed tissue culture process is greatly simplified, the culture period is shortened, the rooting rate and the root strengthening rate are increased, the rooting rate is stabilized to be 95% or above, and the rooting rate is stabilized to be more than 95%. Technical support is provided for establishment of a new peony seed tissue culture and rapid propagation technology, and a material foundation is laid for promotion of peony seed tissue culture and rapid propagation factorization.

The invention relates to the technical field of low-temperature carbonization, in particular to a low-temperature energy-saving environment-friendly carbonization furnace for carbon fiber textiles. Comprising a supporting platform, two supporting plates are oppositely arranged at the top of the supporting platform, a treatment tank is rotationally arranged between the two supporting plates, the treatment tank is provided with a treatment cavity used for containing treatment liquid, and a plurality of stirring plates are arranged on the inner wall of the treatment cavity in the circumferential direction at equal intervals; driving gear blocks are arranged on the outer wall of the treatment tank in the circumferential direction, a driving rod is rotationally arranged on the supporting platform and located at the bottom of the treatment tank, a driving gear meshed with the driving gear blocks is arranged on the outer wall of the driving rod, and one end of the driving rod is fixedly connected with a driving motor installed on one side of the supporting platform; compared with the prior art, the waste gas is in full contact with the treatment liquid, the contact area of HCN and NH3 in the waste gas of the tank body and the treatment liquid is increased, so that the waste gas treatment efficiency is improved, and a good environment-friendly effect is achieved; in addition, due to the adoption of a low-temperature treatment process, a certain energy-saving effect is achieved.

The present application relates to the technical field of plant tissue culture, and specifically discloses a method for establishing a tissue culture sterile system of peach rootstock dormancy material, which comprises the following steps: S1, selecting one-year-old branches with leaf buds in the dormancy period, removing flower buds and cleaning; S2, performing low-temperature treatment on the branches, then performing water culture and bud breaking to obtain sprouting branches; S3, performing surface sterilization treatment on the sprouting branches, and then washing with sterile water; S4, peeling the sprouting buds from the branches under sterile conditions, removing the external wrapping tissues of the bud bodies, and exposing the internal tender tissues; S5, performing secondary sterilization treatment on the exposed tender tissues, and then washing with sterile water; and S6, inoculating the bud bodies subjected to the secondary sterilization treatment into a culture medium for culture, and establishing a sterile system; according to the above method, in the process of establishing the sterile system of Zhongtao Kangzhen No. 1 material, the sterilization survival rate of 100 bud heads is as high as 80% or more, and the work efficiency and the utilization efficiency of the material are greatly improved.

The application discloses a preparation method of a cactus and orchid seed composite beverage and belongs to the technical field of health food processing. The method is designed according to a standardized industrial formula with cactus and orchid seed as core raw materials, and is matched with Dendrobium candidum, white granulated sugar, erythritol and other auxiliary materials. Pure oxygen-free water is used as a solvent throughout the process. A pH 3.5 stable buffer system is constructed by compounding sodium citrate and citric acid. The fine filtration after low-temperature centrifugation is replaced by industrial filtration with an 80-100 mesh filter screen. The finished product is prepared by combining the whole low-temperature treatment and HPP ultra-high pressure cold sterilization process. The oxygen-free pure water effectively avoids the oxidation loss of active ingredients, and the whole low-temperature and HPP process realizes the efficient retention of active ingredients such as cactus SOD, flavonoids and polysaccharides. Meanwhile, the problems of unstable pH, low industrial filtration efficiency and easy stratification and precipitation of the traditional cactus beverage are solved. The finished beverage has a refreshing taste, a sweet and sour coordination and strong stability.

This invention discloses a method for preparing and applying elastic ceramic nanofiber flocs. Precursor coiled nanofibers are dynamically assembled using a periodically arranged spinneret module to form three-dimensional interwoven precursor nanofiber flocs. These flocs are then calcined at high temperature to obtain elastic ceramic nanofiber flocs. The flocs are cut into pre-formed sheets, conveyed by a conveying device, and wound onto the main mold of a self-rotating forming device under the action of auxiliary forming rollers. Adhesive is sprayed from the pre-formed sheets to achieve interlayer bonding, producing preforms. The main mold and preforms are placed into a matching mold to form a forming module. The preforms are then impregnated by an ultrasonic impregnation and homogenization device, followed by low-temperature treatment to form ice crystals in the impregnation solution perpendicular to the fiber direction, achieving inter-sheet stitching. Finally, the preforms are dried and demolded to obtain the finished product. This invention preserves the intrinsic elasticity and three-dimensional network structure of the fibers without damaging their structure and morphology, enabling short-process, high-efficiency, and continuous preparation of floc products.

The invention discloses a frozen earth steel bar heat treatment process and belongs to the technical field of steel bar heat treatment. The method specifically comprises the following steps: preheating; carrying out austenitizing treatment; quenching treatment; carrying out tempering treatment; performing low-temperature treatment; and natural cooling: after the low-temperature treatment is finished, taking out the steel bar, and naturally cooling the steel bar to the ambient temperature at room temperature. The invention aims to provide the frozen soil reinforcing steel bar heat treatment process, and the yield strength and the tensile strength of the reinforcing steel bar in a frozen soil environment are effectively improved through the specific steps of heating, heat preservation, cooling and the like.

The application relates to the technical field of paint, and discloses a preparation method of a low-temperature-resistant paint for natural gas metal pipelines, which comprises 85-95 parts by weight of an acrylate monomer, 5-15 parts by weight of a methyl methacrylate hydroxyl perfluoroalkane, 1.1-1.2 parts by weight of an initiator, 28-40 parts by weight of a filler and 12-30 parts by weight of an isocyanate-terminated polyurethane prepolymer. The isocyanate-terminated polyurethane is chemically bonded to the acrylic resin matrix, plays a good toughening role, and can improve the adhesion, toughness and impact resistance of the paint film. After low-temperature treatment, the acrylic resin molecular chain and the isocyanate-terminated polyurethane still maintain a stable crosslinking system, the adhesion grade and the impact resistance have a very small decline, the paint film is not easy to crack and fall off at low temperature, and good low-temperature resistance is shown.

The utility model discloses a micro-fluidic chip. Belongs to the technical field of detection consumables. The liquid injection hole, the liquid drop forming cavity, the liquid drop tiling cavity, the bubble gathering cavity and the liquid discharge hole which are communicated in sequence are jointly formed by the chip body and the sealing layer which are connected in the sealing manner; a guide surface for guiding the bubbles in the liquid drop tiling cavity to move towards the bubble gathering cavity is arranged on the inner wall of the liquid drop tiling cavity, so that the bubbles in the liquid drop tiling cavity can quickly move towards the bubble gathering cavity under the action of buoyancy; according to the micro-fluidic chip disclosed by the invention, the liquid drops are uniformly distributed in the liquid drop tiling cavity, are gathered or combined in the bubble gathering cavity and are directly discharged out of the micro-fluidic chip from the liquid discharge hole, so that the phenomena that bubbles remain in the liquid drop tiling cavity, the volumes of the bubbles are changed along with a high-low temperature treatment process to disturb the liquid drops, the adjacent liquid drops are mutually fused, and a detection result is influenced are avoided.

The invention discloses a preparation method of liquid compound edible oil, which comprises the following steps: scientifically proportioning refined lard oil and vegetable oil, adding a proper amount of natural antioxidant, mixing, blending and performing low-temperature treatment under specific process conditions to promote high-melting-point saturated triglyceride in the lard oil to preferentially crystallize and separate out, and keeping at constant temperature for a period of time, thereby obtaining the liquid compound edible oil. Then tiny solid fat crystals are removed in a filter pressing or centrifugation mode, and the edible oil which is kept in a clear liquid state at the normal temperature, is good in stability and has the mellow flavor of animal fat and the refreshing taste of vegetable fat is obtained, so that the problems that existing lard oil is in a solid state at the normal temperature and is inconvenient to take and use, negative effects are easily caused to health when lard oil is independently used, and the use cost is low are solved. The flavor is insufficient when the vegetable oil is independently used for cooking and frying the green vegetables.

The invention relates to the technical field of breeding, and discloses a character screening method of an instantaneous cold-resistant plant, which is used for carrying out instantaneous low-temperature treatment on the plant and screening the instantaneous cold-resistant plant by comparing the shrinkage degree of the plant before and after the low-temperature treatment, and also discloses a screening device of the character screening of the instantaneous cold-resistant plant. According to the invention, automatic grading and screening of plants are realized, the screening precision is high, subsequent screening of characters of experimental bodies is not needed, and the screening rhythm is accelerated.

The present invention belongs to the field of molecular biology, and specifically discloses an application of a rice OsERF52 protein and its encoding gene in improving plant low temperature tolerance, and relates to the field of plant genetic engineering technology. The amino acid sequence of the rice OsERF52 protein is shown in SEQ ID No. 2. The present invention clarifies for the first time that the rice OsERF52 gene is involved in low temperature response at the protein level, and its protein content gradually increases with low temperature treatment; cold tolerance analysis shows that OsERF52 overexpressing rice plants have a low temperature resistance phenotype and a high survival rate, while Oserf52 mutants all show a low temperature sensitive phenotype, and the survival rate is significantly lower than that of the wild type, indicating that OsERF52 is a positive regulatory factor in rice response to low temperature. The rice OsERF52 protein and its encoding gene can be used to improve plant low temperature tolerance, which is of great significance for the study of the molecular mechanism of low temperature stress and the breeding of new low temperature resistant varieties.

The invention relates to the technical field of heat treatment, in particular to an ultralow-temperature top-mounted ball valve material heat treatment device which comprises a liquid nitrogen subzero treatment box and an intercepting mechanism, the bottom of the rear side of the liquid nitrogen subzero treatment box communicates with a low-temperature pump, the top of the low-temperature pump communicates with a low-temperature pipe, and the side, away from the low-temperature pump, of the low-temperature pipe communicates with a liquid nitrogen tank; the intercepting mechanism is arranged on the inner side of the liquid nitrogen subzero treatment box, the liquid nitrogen subzero treatment box comprises a liquid nitrogen pool, a controller, hydraulic cylinders, a cover plate, a separation frame and a positioning net, the controller is installed on the left side of the liquid nitrogen pool, and the two hydraulic cylinders are connected to the two sides of the rear side of the liquid nitrogen pool through bolts correspondingly. The heat treatment device for the ultralow-temperature top-mounted ball valve material has the advantages that the structure for independently placing the ball valve material is provided, so that the ball valve material can be independently and separately placed, mutual transfer and influence of the temperature of a ball valve cannot be caused, and the stability of the ball valve during ultralow-temperature treatment is improved.

The invention discloses a graded porous conductive polymer and a preparation method and application thereof, pyrrole / aniline / thiophene is used as a raw material, a ferric trichloride aqueous solution is added, freeze drying is performed, washing and drying are performed after low-temperature treatment in an air atmosphere, and the graded porous conductive polymer is obtained and has dual functions. The composite material is used as an active material and is combined with a gel electrolyte to assemble a micro supercapacitor. The composite material is used as a sensing material to construct a pressure, gas or humidity sensor. A miniature supercapacitor and a sensor are subjected to coplanar integration, and self-powered and flexible wearable application is realized. The system is low in interface resistance, high in electron transmission efficiency, simplified in integration process, reduced in overall size, reduced in preparation cost and difficulty, capable of meeting the small-size and light-weight development requirements of electronic equipment and excellent in performance.

The present application relates to a kind of pressure-ultrasonic-microwave processing preparation baking-free phosphogypsum building material method, comprising the following steps: 1) phosphogypsum is added with calcium sulfate supersaturated liquid, rubber powder, calcium stearate, liquid paraffin, aluminate, succinic acid, graphene oxide in high-speed mixer in turn, and mixed uniformly to obtain modified phosphogypsum;2) modified phosphogypsum is simultaneously treated with ultrasonic and pressing, and modified phosphogypsum block is obtained;3) modified phosphogypsum block is treated with microwave, and baking-free phosphogypsum building material is obtained.The present application has high waste rate, and low carbon emission, and the phosphogypsum ratio in the final baking-free phosphogypsum product of the present application can reach more than 90%, and compared with the traditional baking-free brick needing to be treated by autoclave curing, the present application uses normal temperature forming, low-temperature treatment, and the carbon emission generated in the product preparation process is lower, and the baking-free phosphogypsum building material prepared by the method of the present application has good economic benefits.

The application provides an in-vitro seed embryo culture method of peony hybrid seeds, which comprises the following steps: 1) taking Chuan-shao No.1 or Chuan-shao No.2 as the female parent, Bozhou peony as the male parent to cross, collecting hybrid seeds, cleaning and disinfecting, taking embryos to obtain seed embryos; 2) taking the seed embryos, connecting into seed embryo starting seedling culture medium to culture, after the F1 generation seed embryo sprouts, first low-temperature treatment and then constant-temperature culture to obtain tissue culture seedlings; 3) taking the tissue culture seedlings to harden and transplant, which can be used. Under the culture of the specific culture medium, the double dormancy problem of the peony hybrid seeds is solved, and the low germination rate, high rot rate and embryo abortion of the peony hybrid seeds are overcome, so that the difficulty of the hybrid peony seedling quantity and quality is solved.

The production method of the double-flange thin-walled irregular part of the present invention involves removing the original window end process clamps and openings on the mold, reducing the wax temperature and increasing the mold shell strength during the wax molding process, increasing the liquid stirring speed during argon refining in the melting process, using steel wire mesh for anti-collision isolation on the product surface during solution treatment, and three rounds of high and low temperature treatment. This ensures that the local wall thickness of the window processing is sufficient during processing, the intersection point of the outer circle surface and the four window surfaces is concentric, the inner opening size is stable, and the flange surfaces at both ends are perpendicular to the center line. During the machining process, the product size remains stable as the wall thickness decreases, and the overall pass rate of the cylinder frame reaches 90%.

The application relates to the technical field of electroplating, and discloses a chromium electroplating process for improving the hardness of a connector terminal, which comprises the following steps: performing surface pretreatment on the connector terminal, removing surface impurities through ultrasonic cleaning and micro-etching treatment; performing heating treatment on the connector terminal; performing electroplating treatment on the connector terminal by using an electroplating solution comprising trivalent chromium salt, boron nitride nanoparticles, ferroferric oxide nanoparticles, nickel ions, sodium dichromate and chromium alloy additives, so as to form a chromium plating layer; performing passivation treatment on the plating layer; performing low-temperature treatment on the plating layer; and spraying a protective layer on the chromium plating layer. Through the trivalent chromium salt and the sodium dichromate, the trivalent chromium salt is used to reduce hexavalent chromium ions into trivalent chromium, the toxicity of the hexavalent chromium is reduced, the sodium dichromate is used to provide a stable chromium source, the deposition of chromium elements in the electroplating process is ensured, the pollution of hexavalent chromium to the environment and the harm of hexavalent chromium to the health of operators are solved, and the environmental protection and safety of the electroplating process are improved.