50results about How to "Regulation content" patented technology

The invention relates to a laser cladding powder for 30CrMnSiNi2A steel and a preparation method. The amount of each component in the laser cladding powder is Cr 0.8%-1.0%, Mn 0.75%-1.10%, Si 0.65% by weight percentage ‑1.10%, Ni2.0%‑3.2%, C0.16%‑0.22%, Cu0.15%‑0.20%, P0.015%‑0.020%, S0.01%‑0.015%, Rare earth 0.001%‑0.015% , the remainder is iron. The present invention further proposes a preparation method of the cladding powder. The laser cladding powder is specially used in the laser cladding technology of 30CrMnSiNi2A steel, so as to ensure the excellent bonding strength of the cladding interface, lower metallurgical defects and reduced dilution rate, and improve the fusion rate. The toughness of the cladding layer improves the wettability of the cladding powder, inhibits the cracking of the cladding layer and delays the crack growth rate.

The present invention provides banana transcription factors MaARF12 and MaARF24, which are proteins encoded by genes whose nucleotide sequences are shown in SEQ ID NO: 1 and SEQ ID NO: 2, respectively. The present invention also provides the encoding gene and application of the above transcription factor. Both the banana transcription factors MaARF12 and MaARF24 of the present invention can be combined with the promoter region of the banana fruit starch branching enzyme gene MaSBE2.3, can interact with the MaSBE2.3 gene, and inhibit its expression, which is beneficial to regulating the content of amylopectin and improving starch It is of great significance to cultivate new banana varieties with high quality and provide candidate transcription factor resources for improving the quality of amylopectin in bananas or other fruits.

The invention provides a solid lubrication composite coating on the surface of a base body. The composite coating is composed of hard phase nanocrystalline CrC and a lubricating phase a-C, a CrC / a-C composite coating is formed, the characteristics that the CrC hard coating is high in hardness and low in abrasion are kept, and meanwhile the excellent self-lubricating property of the a-C material is achieved. The multi-arc ion plating technology is adopted, metal Cr serves as a target material, high-purity Ar serves as working gas, C2H2 serves as reaction gas, the CrC / a-C composite coating is deposited on the surface of the base body, and the content of the CrC phase and the a-C phase in the composite coating can be regulated and controlled by controlling the flow of the Cr target current and the reaction gas C2H2. The hardness of the composite coating reaches up to 31 GPa, the abrasion rate reaches the magnitude of 10<-16> m<3> / N.m, the friction coefficient in the atmospheric environment is lower than 0.2, the base body working in the high-abrasion and high-friction environment can be well protected, and very high application value is achieved.

The invention belongs to the technical field of nano composite preparation and relates to a nano iron-carbon composite powder preparation method. The nano iron-carbon composite powder preparation method is characterized by including the steps: taking ferric nitrate as an iron source, taking water-soluble organics as a carbon source, and preparing the ferric nitrate, the carbon source and a reducing agent into homogeneous aqueous solution; heating the solution to enable volatilization, concentration and decomposition of the solution to obtain a precursor; calcining in a reducing atmosphere to obtain nano iron-carbon composite powder, wherein metal iron particles of the nano iron-carbon composite powder are uniform and adjustable in size distribution, iron / carbon phases of the nano iron-carbon composite powder are uniform in distribution and adjustable in content, and iron particles of the prepared nano iron-carbon composite powder are smaller than 20nm. The nano iron-carbon composite powder preparation method has the advantages of easiness in material acquisition, equipment simplicity, short process, high efficiency, low cost and applicability to industrial production.

The invention discloses a photonic crystal hydrogel film with both pH value and ionic strength responses, a preparation method and application thereof. The photonic crystal hydrogel film includes Fe3O4 nanoparticles and polyacrylamide-methacrylic acid hydrogel; the Fe3O4 nanoparticles are uniformly dispersed in the hydrogel, arranged in a one-dimensional chain, and the nanoparticles in the film The concentration is 1-50 mg / mL. The preparation method of the photonic crystal hydrogel film includes uniformly mixing Fe3O4 nanoparticles and hydrogel monomers, causing a curing reaction by ultraviolet light, and finally immersing in a soluble carbonate aqueous solution to obtain the desired film. The preparation method of the invention is simple in operation, strong in repeatability, convenient for large-scale preparation, the amount of carboxyl groups in the obtained film is controllable, the film is monochromatic, and has obvious color changes under the stimulation of pH value or ionic strength, and is suitable for naked eye detection.