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343results about How to "The process is simple" patented technology

Tissue culture method of ginseng adventitious root

The invention discloses a tissue culture method of ginseng adventitious root, comprising the steps of induction, amplification and successive transfer culture of ginseng callus; the induced callus is inoculated on the prepared solid culture medium and added with plant growth regulator to be cultured for 3-4 weeks under the conditions of sterility, the temperature of 23-25 DEG C and keeping in dark place; the amplified callus is inoculated on the prepared solid culture medium and added with proper plant growth regulator to be cultured for 3-5 weeks under the conditions of sterility, the temperature of 23-25 DEG C and keeping in dark place, and then the adventitious root can be formed; the formed adventitious root is picked out and inoculated on the prepared liquid culture medium and added with the plant growth regulator to be cultured for 4-5 weeks under the conditions of sterility, room temperature and sunshine. The method has higher actual significance than ginseng cell cultivation, and the growth speed of the adventitious root is much higher than that of the original root; furthermore, the production rate of active secondary metabolite of the adventitious root is high and stabler and is not influenced by natural environment such as natural disaster and the like; the tissue culture method also has the characteristics of simple technique process, high inductivity, good repeatability, rapid propagation of the adventitious root, etc.
Owner:TIANJIN UNIV

Solder resisting method for circuit board

The invention discloses a solder resisting method for a circuit board. The solder resisting method for the circuit board includes the following steps, a step 20 is that a first ink layer is printed in a silk-screen printing mode, more specifically, a silk screen with blocking points is utilized for printing the first ink layer, the blocking points cover holes in the circuit board, each blocking point is 0.13 to 0.17 millimeter longer than the diameter of each hole in the circuit board, and the thickness of the first ink layer is 35 micro meters to 40 micro meters; a step 30 is that a standing process is carried out on the circuit board; a step 40 is that a second ink layer is painted in an electrostatic spraying mode, more specifically, the electrostatic spraying technology is utilized for spraying the second ink layer on the circuit board, the second ink layer covers the first ink layer, and the thickness of the second ink layer is 40 micro meters to 50 micro meters; and a step 50 is that a solder resisting curing process is carried out, more specifically, the first ink layer and the second ink layer are exposed, developed and cured. The solder resisting method for the circuit board integrates the advantages of two solder resisting technologies, namely silk-screen printing and electrostatic spraying, the requirement that no solder resisting ink enters the holes of the circuit board is met, the technological processes are simple, and processing efficiency is high.
Owner:SHENNAN CIRCUITS

Method for producing high-aluminum steel plate blanks

The invention provides a method for producing high-aluminum steel plate blanks. The method comprises the following steps: primarily smelting, wherein in the process, argon serves as bottom blowing gas and the end-point carbon content is controlled to be not less than 0.06 weight percent; strictly controlling the slag discharge amount in the tapping process, performing deoxidation alloying and recarburization on molten steel and slagging; performing ladle furnace (LF) refining, conveying the molten steel to an LF station, and feeding an aluminum wire for the first time while weakly stirring by using the argon; after feeding aluminum for the first time, stirring by using the argon, adjusting the temperature, adding aluminum (Al) particle to diffuse and deoxidize, so as to guarantee white slag operation, and feeding aluminum for the second time; performing Ruhrstahl and Heraeus (RH) vacuum treatment and component fine adjustment on the molten steel after feeding the aluminum for the second time, so as to adjust the Al content to be over 1.5 weight percent and adjust other alloy component content to be within the required range; and injecting the molten steel into a tundish, pouring the molten steel into a plate blank continuous casting crystallizer from the tundish and finishing the continuous casting production to obtain the high-aluminum steel plate blanks.
Owner:LAIWU IRON & STEEL GRP

Iron-based composite material reinforced by in-situ titanium carbide grains and preparing method thereof

The invention discloses an iron-based composite material reinforced by in-situ titanium carbide grains and a preparing method thereof. The preparing method is characterized in that: high-strength high-toughness spheroidal graphite cast iron is used as a matrix, in-situ grown submicron titanium carbide grains are used as reinforcing grains, and the titanium carbide grains are uniformly distributedon the spheroidal graphite cast iron matrix to obtain a high-strength high-toughness iron-based composite material; and iron powder, titanium powder and carbon powder are fully mixed by utilizing a mechanical alloying method to form composite powder, spheroidal graphite cast iron is molten and treated by a conventional method, the composite powder is added to molten iron during secondary inoculation in proportion, constant temperature is kept for 5-10min and casting is carried out to obtain a cast-state composite material, and the cast-state composite material is subjected to isothermal quenching heat treatment to obtain the iron-based composite material. According to the iron-based composite material prepared by the method disclosed by the invention, the in-situ titanium carbide grains are small in size and uniformly distributed on the matrix so as to ensure the characteristics of high strength and high toughness of the iron-based composite material.
Owner:JIANGSU TANGCHEN AUTOMOBILE PARTS

Strong plastic deformation extrusion molding device and method for magnesium alloy band rib barrel-type part

The invention provides a strong plastic deformation extrusion method and a molding device for magnesium alloy band rib barrel-type part, belonging to the technical field of plastic processing. A columnar billet is subjected to channel-changing corner extrusion for the first time to extend to a circumferential direction to form a circular rib and then subjected to the channel-changing corner extrusion for the second time to enter an up-down mold cavity to form a thin-walled cylinder provided with four longitudinal ribs. When a material is subjected to corner extrusion for multiple times, crystalline grains are constantly refined to generate strong plastic deformation to cooperate with the mold cavity to realize extrusion molding once and obtain the high-strength magnesium alloy band rib barrel-type part. The length of a diameter fixing band of an extrusion mold is shrunk so as to reduce friction between a formed part and a mold to decrease forming force. A longitudinal pull rod and a transverse shaft pin for special purpose are designed and cooperate with a mold structure, and after part molding is completed, the return stroke of a workbench on an extruder is utilized to disassemblethe mold and take out the formed part. A magnesium alloy barrel-type part, which has high strength, can be molded once, a circular rib and longitudinal bars therein can be used as support structures,and the designed part taking structure can be used for effectively solving the problem that a barrel-type extrusion part is difficult to take out.
Owner:UNIV OF SCI & TECH BEIJING

Viscosity reduction type polycarboxylate concrete admixture and preparation method thereof

The invention discloses a viscosity reduction type polycarboxylate concrete admixture and a preparation method thereof. The polycarboxylate concrete admixture contains the following synthetic raw materials: low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A, an unsaturated carboxylic acid comonomer B, alkylphenol ethoxylate C, an initiator, a reducing agent, a chain transfer agent, caustic soda liquid and water, wherein the mass ratio of the synthetic raw materials is as follows: a ratio of the low molecular weight segmented modified unsaturated polyoxyethylene ether comonomer A to the unsaturated carboxylic acid comonomer B to the alkylphenol ethoxylate C to the initiator to the reducing agent to the chain transfer agent to the caustic soda liquid to the water is (320-420):(24-36):(3-10):(1-5):(0.5-3):(0.5-4):(20-50):(400-500). The viscosity reduction type polycarboxylate concrete admixture disclosed by the invention has the characteristics of excellent dispersion property, obvious viscosity reduction effect, and excellent cement adaptability, and the product is simple in process, safe, reliable and stable in performance, does not contain any chloride ion, does not have any Corrosion damage on reinforcement and is environment-friendly.
Owner:广东瑞安科技实业有限公司
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