23results about How to "Reduce softening" patented technology

The utility model provides an intelligent snow and ice melting system for a steel structure roof. Comprising an intelligent control system (1), a snow melting and deicing system (2), an environment monitoring system (3), a first connecting line (4) and a second connecting line (5), the environment monitoring system acquires the roof state and transmits a signal to the intelligent control system, the intelligent control system judges whether to start the snow and ice melting system or not, and heating is started when the temperature reaches the lower limit value and the accumulated snow or ice thickness reaches the upper limit value. Stopping heating when the temperature reaches an upper limit value and the thickness of accumulated snow or ice reaches a lower limit value; after the snow and ice melting system is started for heating, the heating power of the adjustable infrared heating film is changed along with the change of the environment state of the roof, the heating power is reduced when the outdoor temperature is high and the snow body thickness and the ice body thickness are small, and the heating power is increased when the outdoor temperature is low and the snow body thickness and the ice body thickness are large. And the most ideal snow melting and deicing effect can be achieved with the minimum power consumption.

The invention relates to a transcription factor gene specific fragment for delaying softening of postharvest apple fruits and a regulation and control method, and belongs to the technical field of plant genetic engineering. The MdWRKY33 transcription factor gene in an apple plant with poor storability is knocked out or silenced by using a transcription factor gene specific fragment as shown in SEQ ID NO.1 in a nucleotide sequence table, so as to delay the softening of postharvest apple fruits. The specific operation comprises the following steps: cloning a transcription factor gene specific fragment into a virus silencing vector pTRV2 to obtain a recombinant plasmid; respectively transferring the auxiliary vector pTRV1 and the recombinant plasmid into agrobacterium tumefaciens GV3101 strain cells by using a freeze thawing method to respectively obtain strain cells A and strain cells B; respectively carrying out culture medium culture and infection solution suspension treatment, and then preparing a mixed infection buffer solution; and immersing the apple fruits in the mixed infection buffer solution, and carrying out vacuum treatment to obtain the instantly silent apple fruits. Ethylene biosynthesis and cell wall degradation in the apple fruits are inhibited, and softening of the picked apple fruits is delayed.

The invention discloses application of a natural inducer in fruit preservation, and particularly relates to the technical field of fruit preservation. According to the application of the natural inducer in fruit preservation, the natural inducer is used as an active ingredient to inhibit growth of botrytis cinerea on fruits and induce immune systems of the fruits to enhance active oxygen metabolism; the natural inducer is theanine; the fruits are kiwi fruits. When the natural inducer provided by the invention is applied to fruit preservation, a relatively good preservation effect can be exerted on kiwi fruits.

The invention belongs to the technical field of sealants, and discloses a low-modulus high-elongation antifouling weather-resistant sealant, a preparation method and application thereof, the low-modulus high-elongation antifouling weather-resistant sealant comprises the following raw materials by weight: 100 parts of alpha, omega-dihydroxy polysiloxane, 80-200 parts of an inorganic filler, 10-30 parts of a cross-linking agent, 1-4 parts of a coupling agent, and 2-10 parts of a titanate vulcanizing agent; wherein the inorganic filler comprises active calcium carbonate and modified talcum powder; the modified talcum powder is prepared by sequentially carrying out layered stripping and modification treatment on talcum powder. The low-modulus and high-elongation antifouling sealant provided by the invention can be well suitable for joint sealing during repair of ancient buildings, and meanwhile, the product can also be extended to the field of sealing of other low-modulus antifouling buildings with the same requirements, and has high economic value.

The application provides a copper-aluminum dissimilar metal resistance brazing method for a wind power generator, comprising the following steps: S1, temperature field regulation of partition resistance heating: a partition resistance heating mode of double-electrode independent power supply is adopted, current is respectively input to the copper side and the aluminum side for independent control, and the brazing interface temperature is controlled in the range of 580-620 DEG C; S2, interface diffusion control of nano nickel barrier layer: a nano-crystalline nickel barrier layer is prepared in advance on the surface of the copper matrix to be connected; S3, wetting and filling of zinc-based composite filler material: zinc-based composite filler material is used for brazing; S4, pressure-assisted brazing seam densification: axial pressure in the range of 0.5-2 MPa is applied during brazing; S5, atmosphere protection and surface activation: the brazing process is carried out under the condition of inert protective atmosphere. Through the cooperation of partition heating and nano nickel barrier layer, the strength of the copper-aluminum brazed joint is improved to more than 80% of the base material, and the contact resistance is reduced to 3 mu omega cm 2 The energy consumption of the single piece is reduced by 80%, and the qualified rate reaches more than 95%.

The invention belongs to the technical field of hot forming steel electric arc welding, and particularly relates to a hot forming steel electric arc welding device based on forced cooling, which comprises a box body, a welding gun and a cooling system, the cooling system comprises a water-cooling gun support and a water-cooling gun, the water-cooling gun support is slidably mounted in the box body, the water-cooling gun is mounted on the water-cooling gun support, and the water-cooling gun is mounted on the water-cooling gun support. In the welding direction, the welding head of the welding gun is arranged in front, and the outlet end of the water cooling gun is arranged behind; the water-cooling gun comprises a water-cooling channel and a high-pressure protective gas channel, when welding is carried out, the water-cooling gun support drives the water-cooling gun to synchronously move along with the welding gun, meanwhile, cooling water is introduced into the water-cooling channel to cool a weldment, protective gas in the high-pressure protective gas channel can form a layer of gas curtain to block the cooling water, and the cooling water is cooled by the high-pressure protective gas channel. And a water cooling channel of the water cooling gun is in a closed state in the welding direction. Heat input of a heat affected zone can be reduced, the softening degree of a tempering zone is weakened, and the original welding production efficiency can be kept.

The invention belongs to the technical field of composite materials, and provides a heat and humidity resistant PEEK composite material and a preparation method thereof, the heat and humidity resistant PEEK composite material comprises the following raw materials by weight: 85-110 parts of PEEK; 5 to 15 parts of polytetrafluoroethylene; 5 to 15 parts of carbon fiber; 5 to 10 parts of modified montmorillonite; 0.5 to 2 parts of a compatilizer; and 0.1 to 0.5 part of an antioxidant. The preparation method comprises the following steps: putting PEEK and polytetrafluoroethylene into a drying oven for drying, then adding the dried PEEK and polytetrafluoroethylene, carbon fibers, modified montmorillonite and an antioxidant into a high-speed mixer for mixing, and uniformly mixing to obtain a mixture; the preparation method comprises the following steps: mixing the raw materials, adding the mixture into a double-screw extruder, extruding and granulating, cooling, and drying to finally prepare the PEEK composite material, while maintaining excellent friction resistance and mechanical properties, the heat and humidity resistance is obviously improved, and the PEEK composite material has a wide application value.

The present disclosure relates to a laser tailor-welded wire, an Al-Si coated hot-formed steel plate, a preparation method thereof and a vehicle. Based on the total weight of the laser tailor-welded wire, the laser tailor-welded wire comprises: 0.01-0.30 wt% C, 1.0-2.5 wt% Mn, 0.30-2.0 wt% Si, 0.02 wt% or less P, 0.04 wt% or less S, 0.01-0.20 wt% V, 0.10-0.50 wt% Cr, 3.0-7.0 wt% Ni, 0.3-1.2 wt% Mo, 0.01-0.04 wt% Nb, 0.005-0.06 wt% rare earth elements, and the balance Fe and impurities; the rare earth elements include La and Ce, and the weight ratio of La:Ce is 1:1.4-2.6. The present invention can reduce the softening effect of Al on the weld and the α-ferrite content, enhance the weld strength, and meet the oxidation resistance and strength requirements of the hot stamping formed plate.

The invention discloses a methyl jasmonate composite fresh-keeping liquid preparation method, which comprises: crushing milkvetch root and licorice root, placing the crushed milkvetch root and licorice root, honeysuckle flower, chrysanthemum flower and deionized water in an ultrasonic wave device, adding cellulase, hemicellulase, pectinase and an acid-base regulator, and carrying out ultrasonic extraction, filtration and centrifugation to obtain an extraction liquid; the preparation method comprises the following steps: dissolving methyl jasmonate and lecithin in ethanol, uniformly mixing, and adding deionized water to prepare a methyl jasmonate solution; and mixing the jasmonic acid methyl ester solution and the leaching solution according to a certain volume ratio to obtain the jasmonic acid methyl ester composite fresh-keeping solution. The methyl jasmonate composite fresh-keeping liquid is used for carrying out spraying treatment and low-temperature ventilation treatment on blueberries after the blueberries are picked, so that the reduction of hardness and soluble solids in the storage process of the blueberries can be effectively relieved, the problems that the picked blueberries are easy to soften, rot and deteriorate and the like are solved, the shelf life of the blueberries is prolonged, and the commodity value of the blueberries is improved. The composite fresh-keeping liquid is safe, non-toxic, simple to prepare and easy to popularize.

The invention discloses a heat-treatment-free high-temperature-resistant wear-resistant high-toughness die-casting aluminum alloy which comprises the following components in percentage by mass: 7.8 to 8.4 percent of La, 1.2 to 2.4 percent of Cu, 3.9 to 4.4 percent of Sn, 2.1 to 2.4 percent of Cd, 0.8 to 1.1 percent of Ge and the balance of Al. By scientifically designing the composition of the die-cast aluminum alloy, refining the grain size of the aluminum alloy, improving the casting fluidity of the aluminum alloy and eliminating the harm of hydrogen pores and inclusions to the strength and plasticity, an Al2O3.SnO2. CdO surface oxide layer capable of greatly improving the wear resistance of the alloy is formed, a high-temperature-resistant second phase Al11La3 is formed, and the strength and plasticity of the alloy are improved. The tensile strength is not lower than 280 MPa, the yield strength is not lower than 220 MPa, the percentage elongation after fracture is not lower than 14%, the tensile strength of the alloy at the temperature of 350 DEG C is not lower than 235 MPa, the yield strength is not lower than 200 MPa, the percentage elongation after fracture is not lower than 16%, the normal-temperature abrasion rate is 5.56 * 10 <-4 > + / -0.2 mm < 3 > / (N.m), and the abrasion rate at the temperature of 350 DEG C is 10.4 * 10 <-4 > + / -0.4 mm < 3 > / (N.m).

This invention proposes a brazing method for aluminum alloys based on surface activation and a pre-placed Ni layer. The method includes: Step 1, pre-treating the aluminum alloy surface to be brazed to ensure it is dust-free and oil-free; Step 2, subjecting the aluminum alloy surface to ion bombardment to remove the oxide film and activate the surface; Step 3, depositing a Ni thin film on the aluminum alloy surface to form a pre-placed Ni layer; Step 4, assembling the aluminum alloys to be brazed and placing them in a vacuum brazing furnace, with the Ni layers of the two aluminum alloys in contact. Pressure is applied to ensure the upper and lower aluminum alloys are tightly bonded and to prevent relative sliding. The furnace is then vacuum-heated to 540℃~585℃ and held for a preset time before cooling to room temperature to obtain an aluminum alloy / Ni / aluminum alloy brazed joint. The joint obtained by this surface-activated, pre-placed Ni layer-based aluminum alloy brazing method has the characteristics of no oxide film at the interface, high tensile strength, and low deformation rate.

This invention relates to a composite welding method for Al-Mg-Si-Cu aluminum alloys, belonging to the field of welding technology. The composite welding method of this invention includes the following steps: S1, filling nickel foil between the weld seams formed by two workpieces to be welded, determining the relative positions of a galvanometer laser welding machine and a co-pulse CMT welding machine, with the galvanometer laser preceding the heat source; the co-pulse CMT welding machine uses Al-Si welding wire; S2, determining the welding process parameters for the galvanometer laser and the co-pulse CMT; S3, performing welding using the galvanometer laser-co-pulse CMT composite welding process. By improving welding technology, the alloying composition of the weld metal is optimized during the welding stage; and by synergistically utilizing the two heat sources (galvanometer laser and co-pulse CMT) to ensure good weld formation, the heat input to the heat-affected zone of the weld joint is reduced. This significantly improves the strength of the weld joint under the synergistic control of multiple technologies, effectively alleviating the problem of joint softening.

Provided is a PSA sheet having an active energy ray-curable PSA layer that is less susceptible to reduction of hardness to the curable component. The PSA sheet provided comprises an active energy ray-curable PSA layer. The PSA forming the PSA layer comprises a base polymer and a resin A. The resin A is an active energy ray-curable resin having a glass transition temperature of 0 °C or higher by DSC analysis.

The invention relates to an advanced small conduit dry-type construction method, which realizes water-free operation and achieves the purposes of environmental protection and energy conservation. The method specifically comprises the following steps that a plurality of pre-designed hole sites are marked on a tunnel face according to designed hole sites; at each hole position of the tunnel face, according to the designed diameter, angle and depth, a stand column type pneumatic dry drilling machine is adopted for hole forming, after drilling is completed, a drilling rod is withdrawn, and meanwhile a small guide pipe is jacked into a drilled hole; the stand column type pneumatic dry drilling machine is moved to the next marked hole site, and the steps are repeated till construction of the hole site is completed; and advanced small guide pipe jump hole grouting is conducted.

This invention relates to the field of mine ecological restoration technology, and discloses a method and system for mine ecological restoration. The restoration method includes selecting an area with residual heat from underground coal fires on a mine slope where residual coal has spontaneously combusted as a restoration zone; reinforcing and stabilizing the slope of the restoration zone; laying a sludge substrate with a moisture content of 60%-80% on the stabilized slope surface, and using the residual heat from the underground coal fires for in-situ biological drying until the volume reduction reaches a preset threshold of 40%-60%; subsequently, covering the dried sludge substrate with a soil substrate layer and a soil microbial substrate layer to construct a composite growth matrix; and finally, maintaining vegetation on the slope. This invention cleverly combines the residual heat from abandoned mines with urban sludge treatment, achieving the harmlessness, reduction, and resource utilization of sludge, while simultaneously solving the problems of excessively high soil temperatures and difficulty in plant survival in mining areas, achieving the goal of ecological restoration through waste treatment and synergistic efficiency.

The invention relates to the technical field of food, in particular to a biological enzyme treatment method for improving the yield and quality of goat cheese, the biological enzyme treatment method takes fresh goat milk as raw milk, biological enzyme and phenolic acid are adopted for treatment, and the biological enzyme is laccase or tyrosinase. According to the biological enzyme treatment method disclosed by the invention, the sheep cheese is produced and processed by adopting combined treatment of specific types of biological enzymes and phenolic acids, the prepared cheese product has the characteristics of high yield and high milk solid matter recovery rate, the economic value is higher, the quality of the product is well maintained in the storage period, and the shelf life is obviously prolonged. The sheep cheese produced and processed by adopting the biological enzyme treatment method disclosed by the invention is flat and glossy in surface, fine and smooth in tissue state, harmonious in milk flavor, golden in surface after being baked, moderate in hardness and excellent in sensory quality.

The utility model belongs to the field of rolling technology, specifically is a kind of export sliding guide adjustment structure, including guide box;The guide box top is rigidly connected with stepper motor;Stepper motor output end is rigidly connected with rotating rod;Rotating rod both ends are rotatably connected with connecting rod;Connecting rod end is rotatably connected with support;The support one side is rigidly connected with wheel carrier;Wheel carrier both ends are slidably connected with slide rail;Wheel carrier bottom is rotatably connected with a group of guide wheels;The guide wheel bottom is rotatably connected with sliding block;A group of sliding grooves are arranged in the guide box top;The spacing between multiple groups of guide wheels can be adjusted by the rotation of rotating rod and related components driven by stepper motor, to adapt to the rolling conveying needs of different diameters, and multiple groups of guide wheels form continuous guide channel, apply uniform constraint to rolling, reduce deviation or shaking of rolling in conveying process, and its along straight line enters next rolling process, improves rolling precision and product quality.

The invention relates to the technical field of grape storage and fresh-keeping processes, in particular to a grape storage and fresh-keeping process based on microorganisms, which comprises the following steps: (1) pretreating grapes; (2) preparing a microbial culture solution; (3) preparing a preservative formula; (4) treating with a preservative; (5) packaging and storing, so that the storage period of the grapes is remarkably prolonged from traditional 3-4 weeks to 6 weeks or above, and meanwhile, relatively high sensory quality is kept; the growth of harmful microorganisms is effectively inhibited, and the total bacterial count and the mould yeast count are only increased to 2.69 and 2.18 lg CFU / g respectively after 6 weeks; the weight loss rate is obviously reduced, is only 3.08% after 6 weeks, and is 50% or above lower than that of a control group; the fruit hardness is effectively maintained, and the fruit hardness is still maintained at 3.52 N after 6 weeks; the retention rate of vitamin C is high, can still reach 90.2% after 6 weeks and is 30% or above higher than that of a control group; the overall sensory quality is excellent, and the overall acceptance score after 6 weeks reaches 8.0.

The invention provides a large-section tunnel supporting structure of a deep sandy gravel covering layer and an excavation method, and relates to the technical field of building construction.The large-section tunnel supporting structure of the deep sandy gravel covering layer comprises a mountain advanced reinforcing module, a high-pressure spraying reinforcing body and a grouting reinforcing body, the high-spraying reinforcing bodies are vertically arranged outside the side lines of the two sides of the large-section cavern respectively, and the multiple grouting reinforcing bodies are vertically and evenly distributed in an excavation area of the large-section cavern; the indoor support module comprises a top arch opposite-penetrating anchor cable, a side wall opposite-penetrating anchor cable and an advance support body; the forepoling body is arranged on the top arch portion of the large-section cavern in the tunneling direction of the large-section cavern and used for reinforcing the top arch portion of the large-section cavern in advance before the large-section cavern is excavated. Compared with the prior art, the problems that collapse and roof collapse are likely to happen to the excavation face in the construction process can be solved.

The application discloses a kind of high-strength waterproof board and preparation method thereof, it is related to plate technical field.The preparation method of the application includes the following steps: sequentially stack 1 steel plate, 2 base plates, 1 fingerprint-resistant polymer film on 1 fingerprint-resistant polymer film, then heat pressing solidification, after cooling, plate is taken out, and high-strength waterproof board is obtained;Wherein, base plate is prepared from modified kraft paper and modified color paper.The water resistance, fire resistance and bonding strength of the plate are effectively improved by modifying kraft paper with modified phenolic resin, hydrophilic silicon dioxide and other components;The bonding strength, water resistance and fire resistance of the plate are further improved by modifying color paper with melamine, vanillin, flame retardant DOPO, 3,4-dihydroxybenzaldehyde and other components.Therefore, the application has a more extensive application prospect.

The invention provides a jujube leaf epidermis wax-protein composite membrane as well as a preparation method and application thereof. The composite film is prepared from raw materials including vegetable protein and jujube leaf epidermis wax. Wherein the mass percentage content of the jujube leaf epidermis wax can be 0-2.5%. According to the prepared jujube leaf epidermis wax-protein composite film, one of the raw materials, namely wax, comes from jujube leaves, the materials are safe and non-toxic, and the resource utilization rate of the jujube leaves can be increased; the obtained jujube leaf epidermis wax-protein composite film has excellent waterproofness, antibacterial activity and oxidation resistance, is used for coating preservation of picked blueberries, has slight influence on sensory quality of the blueberries, and meanwhile, obviously reduces weight loss rate and rotting rate of blueberry fruits during storage, effectively delays softening of the fruits and improves preservation quality of the blueberries. The loss of nutrient substances such as soluble solids, anthocyanin, vitamin C and titratable acid is reduced, and the overall quality of the blueberries in the storage period can be effectively maintained. The invention has the advantages of low production cost and no burden on the environment after use.

The present application relates to the field of ceramic production, and in particular to a production process of an alumina ceramic sheet. In order to solve the problem of reduced performance of alumina ceramics in high temperature, high pressure, and corrosive environments in the prior art, the present application provides a production process of an alumina ceramic sheet. The alumina ceramic provided by the present application is compounded with Fe and Al by a sol-gel method, and can still maintain a relatively good intact form and excellent performance in a high temperature, high pressure, and corrosive environment, and has high strength, thermal shock resistance, and corrosion resistance.

The utility model provides an intelligent snow and ice melting system for a bridge structure cable. Comprising an intelligent control module (1), a snow and ice melting module (2), an environment monitoring module (3), a first connecting line (4) and a second connecting line (5), according to the utility model, the environment monitoring module (3) obtains the state of the cable (21) and transmits a signal to the intelligent control module (1), and the intelligent control module (1) judges whether to start the snow and ice melting module; after the snow-melting and deicing module (2) is started for heating, the heating power of a middle flexible adjustable infrared heating film layer (24) in the snow-melting and deicing module (2) is adjusted according to the external environment state, and when the outdoor temperature is high and the melted snow and ice bodies are thin, the heating power is reduced; the heating power is increased under the conditions that the outdoor temperature is relatively low and the snow melting and ice body is relatively thick; and it is ensured that the optimal snow melting and deicing effect is achieved with the minimum electric energy consumption.