10results about How to "Small aspect ratio" patented technology

The invention provides application of a ring finger protein coding gene OsRF in regulation and control of rice grain shape and grain weight, the gene OsRF for coding the ring finger protein is separated and cloned from rice Nipponbare, and the gene is targeted by rice small RNA OsmiR530. In order to prevent the OsmiR530 from being cut and improve the expression level of the OsmiR530, artificial synonymous mutation is carried out on the OsRF recognized sequence by the OsmiR530, a mutant OsRF fragment (mOsRF) of which the recognition sequence is subjected to synonymous mutation is created by utilizing overlapping PCR (Polymerase Chain Reaction), an overexpression vector of the mOsRF is constructed and is overexpressed in rice, and the grain width and the grain weight of transgenic rice are obviously increased. Therefore, the overexpression of the mOsRF in the rice is of great significance for obtaining round-grain rice and increasing the rice yield, and a new resource and a new research method are provided for rice grain shape improvement breeding.

The invention discloses a tailor-welded component manufacturing method and a tailor-welded component, and the tailor-welded component manufacturing method comprises the following steps: performing combined blanking on each splicing section to obtain a unit combined blanking plate of each splicing section; the splicing end of each unit combination blanking plate is subjected to pre-welding machining; splicing and welding the splicing ends of all the unit combined blanking plates to obtain a component combined blanking plate; the component combination blanking plate is divided into at least two tailor-welded components, so that at least two original independent short welding seams can be connected into a single long welding seam, continuous automation of pre-welding processing, welding seam welding and welding seam flaw detection can be realized, the production efficiency is greatly improved, meanwhile, arc starting and arc stopping are reduced through combined production, and the production cost is reduced. In addition, by means of combined production, the length-width ratio of the component combined blanking plate obtained through tailor welding can be remarkably reduced, the rigidity is improved, and welding deformation is reduced.

A composite magnetic sheet includes a metal magnetic powder and a binder. The saturation magnetization of the composite magnetic sheet is 0.73 T or more and 1.20 T or less. The average thickness of the metal magnetic powder is 0.1 [mu] m or more and 3.0 [mu] m or less. The metal magnetic powder has an average aspect ratio of 2 or more and 200 or less.

The utility model discloses a high-solid-content circulating pulping system which comprises a powder feeding system, a liquid feeding system, a multi-screw extruder and a circulating demagnetizing and dispersing system, and the discharging end of the powder feeding system and the discharging end of the liquid feeding system are respectively connected with the feeding end of the multi-screw extruder. And the discharge end of the multi-screw extruder is connected with the feed end of the circulating demagnetizer. According to the high-solid-content circulating pulping system, slurry conveying kneading and circulating demagnetizing dispersion are achieved through the multi-screw extruder and the circulating demagnetizing dispersion system, qualified slurry is produced, and the problems that a traditional homogenizing system circulating pulping system is weak in kneading effect and cannot meet the high-solid-content requirement are solved.

The application discloses a high-sulfur manganese free-cutting steel MnS inclusion modification preparation method and belongs to the technical field of steel metallurgy. The application forms fine and dispersed rare earth manganese sulfur oxides in the steel through a strict smelting process, and the rare earth manganese sulfur oxides serve as the nucleation core of MnS inclusions in the solidification process, so that the MnS is attached to the surface of the nucleation core to generate composite inclusions. The spheroidization of the rare earth inclusions can reduce the length-width ratio of the MnS inclusions, reduce the anisotropy of the steel, realize the modification of the inclusions and further improve the performance. Through LaMn alloy modification treatment, the morphology of the MnS in the high-sulfur manganese medium-carbon free-cutting steel is improved, the MnS is changed from a strip shape or a chain shape into a fine and uniformly distributed spherical shape or a near-spherical shape, stress concentration is effectively reduced, the Mn content in the steel is also improved, the steel is not infinitely intermingled with the matrix, and the mechanical performance and the cutting performance of the steel are significantly improved.

The invention discloses a packaging structure and a packaging device. The packaging structure comprises a metal substrate, a ceramic wall body structure and a lead, the ceramic wall body structure and the lead are located on one side of the metal substrate, the ceramic wall body structure comprises at least two cavities, the cavities are communicated with the surface, close to one side of the ceramic wall body structure, of the metal substrate, the lead is connected with the ceramic wall body structure, and the at least two cavities comprise the first cavity and the second cavity. The first cavity and the second cavity are arranged in the first direction, and the first direction is parallel to the surface of the side, close to the ceramic wall structure, of the metal substrate. According to the packaging structure and the packaging device provided by the embodiment of the invention, at least two independent cavities are arranged on the same metal substrate, so that the combined packaging of high-power multi-electronic elements is met, the length-width ratio of a single cavity can be reduced, the problem of cracking caused by mismatching of thermal expansion coefficients of a ceramic wall body structure and the metal substrate is solved, and the service life of the ceramic wall body structure and the metal substrate is prolonged. And the integration level is higher, the cost is lower, and the assembly consistency is better.

The invention discloses a method for removing arsenic from arsenic-containing industrial gypsum and simultaneously preparing alpha calcium sulfate hemihydrate. The method specifically comprises the following steps: drying, crushing and sieving the arsenic-containing industrial gypsum; the method comprises the following steps: mixing arsenic-containing industrial gypsum powder with a sulfuric acid solution with the mass concentration of 5-7% to obtain gypsum suspension slurry, adding the gypsum suspension slurry into a reaction kettle, carrying out stirring reaction at 110-150 DEG C for 60-180 minutes, cooling to 100 DEG C, carrying out suction filtration on the slurry while the slurry is hot, sequentially washing with boiling water and absolute ethyl alcohol for 2-4 times respectively, and drying to obtain the alpha calcium sulfate hemihydrate. According to the method, deep removal of arsenic in the arsenic gypsum can be realized, and the removal rate of arsenic is gt; according to the method disclosed by the invention, the product obtained under the condition that no crystal modifier is added has a relatively good crystal form and a relatively small length-diameter ratio, and the method disclosed by the invention realizes arsenic removal of the arsenic-containing industrial gypsum and preparation of a gypsum product with a high additional value.

The present invention discloses a processing method of a stepped hole type Z-direction reinforced core material, comprising the following steps: first, preparing a foam plate, selecting a suitable variable diameter needle according to the thickness of the foam plate, and drawing out the continuous fiber yarn and passing it through the hollow tube of the variable diameter needle, and adjusting the needle to 45° / 60°; then, positioning and fixing the foam plate on a conveying platform, setting the puncture spacing and turning on the puncture device, and completing the puncture of +45° / +60° as the conveying platform moves. The processing method of the stepped hole type Z-direction reinforced core material enables the obtained core material to have good Z-direction compressive performance, and can also provide excellent shear resistance and peel strength, ensuring the stability and uniformity of the core material performance.

The invention discloses a high-rate lithium ion battery graphite negative electrode material and a preparation method thereof. The high-rate lithium ion battery graphite negative electrode material is prepared by the steps of crushing petroleum coke particles, calcining at low temperature, graphitizing at high temperature, cooling, demagnetizing and the like. Through the synergistic effect of multiple processes of raw material crushing, low-temperature calcination and high-temperature graphitization, a large number of micropores and defects are introduced into a carbon matrix, and a shorter diffusion path and an isotropic ion transmission channel are provided for lithium ions; and the lithium ion battery graphite negative electrode material with better rate capability, cycling stability and dynamic performance is prepared.

The invention discloses a method for calculating the radius of a cylindrical ball-end cutter for rough milling of a complex channel, and the method comprises the steps: generating a cutter center drive surface SB, 1; the method comprises the following steps: offsetting a cutter center driving surface SB, 1 to obtain a cutter center driving surface SB, 2, and discretizing the SB, 2 to obtain a plurality of straight generatrix lines; taking any point on any straight generatrix as a sphere center, and calculating a parameter interval in which the sphere center passes through the current straight generatrix and is internally tangent to the radius of an internally tangent sphere of S1 and S2; obtaining an iterative equation of the sphere center; the SB, 2 is biased with the minimum value of the radius parameter set of the SB, 2 as the offset distance to obtain the cutter center driving faces SB, 3, and the steps 2-5 are repeated till the radius parameter set of all the cutter center driving faces SB, k in the machining area is obtained through calculation; in each machining area, the minimum value in the corresponding radius parameter set serves as the radius of the cylindrical ball-end cutter in the machining area; according to the method, the maximum radius of the cylindrical ball-end cutter for multi-axis point milling rough machining of the complex channel parts can be solved while interference of the cutter is avoided.