9results about How to "Inhibit ripening" patented technology

The invention belongs to the technical field of chemistry, and particularly relates to a water-based stable transdermal preparation based on a structural nanoemulsion and a preparation method of the water-based stable transdermal preparation. 1% to 10% of a polyether block copolymer; 5%-20% of a co-emulsion; 0.1% to 15% of an active ingredient; and the balance of deionized water. Through a compounding system of an amino acid surfactant and a gemini surfactant and in combination with the synergistic effect of a specific polyether block copolymer, a nanoemulsion drug delivery system with a stable structure is constructed. Through a compound system of the amino acid surfactant and the gemini surfactant and by combining the synergistic effect of the polyether block copolymer, a nano-emulsion drug delivery system with a stable structure is constructed, and the nano-emulsion drug delivery system has good long-term storage stability and temperature adaptability, is not easy to layer and is uniform in particle size distribution.

This invention discloses a method for preparing a Pt / C catalyst by vacuum impregnation with an ionic liquid and its application. First, a carbon support is mixed with water and alcohol, ball-milled, and then mixed with nitric acid to obtain an acid-treated carbon support. Next, a precursor solution is prepared by mixing a platinum salt, an organic solvent, a surfactant, and water, and then an imidazole ionic liquid is added to it in portions to obtain a precursor solution containing the ionic liquid. This solution is mixed with the acid-treated carbon support and vacuum ball-milled to obtain a mixed slurry. This slurry is then vacuum freeze-dried to obtain a freeze-dried powder. Reduction and heat treatment are then performed to obtain the ionic liquid-doped Pt / C catalyst. The catalyst is then coated onto both sides of a proton exchange membrane to form a catalytic layer. Through this method, this invention not only effectively inhibits the aggregation, migration, and ripening of platinum particles during electrochemical processes, thereby significantly improving the catalyst's durability, but also enhances the catalyst's proton conductivity under low humidity conditions.

The invention relates to the technical field of soft boiled egg preparation, in particular to a soft boiled egg preparation device and method. The bearing frame is arranged in the egg boiling vessel and used for containing eggs; a fixing plate is inserted into the inner bottom of the egg boiling vessel, and the fixing plate is attached to the side wall of the egg boiling vessel; the bearing frame bearing eggs is placed in the egg boiling vessel, the fixing columns penetrate through the conical columns, and in the process that the fixing columns penetrate through the conical columns, the spring buckles on the tops of the fixing columns are matched with the conical columns in a clamped mode to fix the bearing frame to the fixing columns, so that the bearing frame is fixed, it is guaranteed that the eggs are immersed in water, and the bearing frame is kept stable in the soft yolk egg preparation process; after boiling is conducted for one minute, the bearing frame is separated from the fixing column, the soft boiled eggs are obtained after cooling is completed, and it is avoided that due to the fact that the soft boiled eggs are in a high-temperature steam environment for a long time, yolk of the soft boiled eggs is cured.

The invention relates to a hot-rolled wire rod for a 2430 MPa grade stranded wire and a manufacturing method of the hot-rolled wire rod, after Al-Si-V chemical components are rolled and spun into a wire rod, the wire rod is subjected to online molten salt rapid quenching isothermal treatment, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; and then carrying out rear-section molten salt treatment, reducing the circulation volume of molten salt, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out slow cooling through a roller way, so as to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, tempered ferrite and fused sorbite, the material cost can be reduced, abnormal structures can be inhibited, the tensile strength is 1581-1630 MPa, the percentage reduction of area is 34%-39%, off-line heat treatment is not needed, and efficient and stable production of the ultra-high-strength stranded wire is promoted.

The application belongs to the technical field of nanometer material preparation, and particularly relates to a single-wall carbon nanometer tube, a preparation device thereof and a preparation method thereof. The device comprises a reaction furnace, a laser generating system, a target material supply system and a control system. The laser generating system adopts a low-cost and long-life optical fiber laser array to form a large-area irradiation area; the target material supply system continuously transports a graphite composite target material doped with a specific binary metal catalyst to the irradiation area through a linear track. Under an inert atmosphere and high temperature, the optical fiber laser array is used to evaporate the composite target material containing hafnium (Hf) and iron-based transition metals, carbon atoms are catalytically induced to self-assemble, and single-wall carbon nanometer tubes are continuously grown. Through the cooperation of the low-cost laser source, the hafnium-based catalyst and the continuous feeding system, the problems of expensive equipment, low yield, difficult tube diameter control and intermittent production of the traditional laser method are solved, and the low-cost, large-batch and continuous preparation of high-quality single-wall carbon nanometer tubes is realized.

The invention discloses a preparation method of gradient core-shell quantum dots, and belongs to the technical field of functional materials, and the preparation method specifically comprises the following steps: S1, respectively preparing a core-layer precursor solution and a shell-layer precursor solution; s2, in an N2 atmosphere, preparing a ZnSeTe quantum dot core by using the core layer precursor solution; s3, keeping the prepared ZnSeTe quantum dot core solution in an N2 atmosphere, and carrying out gradient gradual change shell layer growth by adopting the shell layer precursor solution at 310 DEG C; and S4, cooling the obtained quantum dots to room temperature, adding absolute ethyl alcohol, performing centrifugal precipitation, and washing the precipitate to obtain a final product. The components of the prepared quantum dot shell layer change slowly, and interlayer growth defects do not exist; the shell layer grows uniformly, and the quantum dots are regular in shape; the outermost layer is completely coated with ZnS, the quantum dots are good in stability, the shell layer is high in adjustability, and various requirements can be conveniently met; in addition, through detection, the fluorescent quantum yield is high, and the half-peak width is narrow.

The invention provides a method for improving the content of flavor dipeptide in salted fish. The method comprises the following steps: pretreating fish to obtain fish blocks; uniformly smearing the fish blocks with table salt to obtain the smeared fish blocks; placing the coated fish blocks in a vacuum package, and vacuumizing to obtain vacuum-packaged fish blocks; performing ultrahigh-pressure pretreatment on the fish blocks subjected to vacuum packaging to obtain the fish blocks subjected to ultrahigh-pressure treatment; and pickling the fish blocks subjected to ultrahigh pressure treatment for natural fermentation to obtain the pickled fish blocks with improved flavor dipeptide content. According to the method disclosed by the invention, the abundance of microorganisms during pickling is adjusted by combining ultrahigh-pressure pretreatment with natural fermentation, so that the content of the flavor dipeptides Val-Ile, Val-Leu, Pro-Lys, Asp-Val, Ile-Glu, Lys-Gly and Ser-Phe in the pickled fish blocks is improved, and finally, the purpose of improving the taste of the pickled fish is achieved.

The present application relates to the technical field of vegetable processing, and particularly relates to a pasteurization line for vegetable processing, which comprises a recognition mechanism, a temperature insulation piece, a liquid insulation plate and a filter piece. An operator first passes vegetables through the recognition mechanism, and then uses sound waves to produce different effects on the change of different vegetable media transmission, so that the sound capturing unit can obtain different sound structures to identify different vegetables. At the same time, the liquid insulation plate is used to divide the sterilization pool, effectively realizing the sterilization strategy of different vegetables and effectively avoiding the ripening caused by insufficient or excessive sterilization effect of part of the vegetables. The pasteurization line has good practicability and economy, and is beneficial to the promotion and use of the equipment.

The invention provides a fruit and vegetable fresh-keeping method of refrigeration equipment, the refrigeration equipment is provided with a fresh-keeping chamber, a detection module for detecting the maturity of fruits and vegetables, and an ethylene module for controlling ethylene adsorption or release, and the fruit and vegetable fresh-keeping method comprises the following steps: obtaining the weight ratio of immature fruits and vegetables; the control module is used for judging an interval of a preset weight ratio of the immature fruits and vegetables in which the weight ratio of the immature fruits and vegetables falls, controlling the ethylene module to adjust a working mode according to the interval of the weight ratio of the immature fruits and vegetables, and controlling the ethylene module to release ethylene when the weight ratio of the immature fruits and vegetables is greater than or equal to 50%; when the weight ratio of immature fruits and vegetables is greater than 20% and less than 50%, the ethylene module is controlled to be closed; when the weight ratio of the fruits and vegetables in the immature state is smaller than or equal to 20%, the ethylene module is controlled to adsorb ethylene. The state of the ethylene module is adjusted according to the weight ratio of the fruits and vegetables in the immature state, and freshness retaining and ripening of the fruits and vegetables are kept.