63results about How to "Theoretical perfection" patented technology

The invention discloses a positioning method and a positioning system for a breast lesion puncture point. The positioning method comprises the following steps of: acquiring breast images shot at two different angles by a bulb tube of an X-ray digital mammography machine, and establishing a lesion projection light cone to generate a puncture guide body model. The maximum cross section is obtained by using a plane cross section guide body of a detector which is parallel with the X-ray digital mammography machine, and a point which is far away from the edge is picked on the maximum cross section to serve as the puncture point. The puncture point determined by the positioning method is located in a breast lesion, and is remote from the edge of the lesion, and more enough lesion tissues can be obtained when puncture biopsy is performed. Compared with other puncture point coordinate computing methods, the positioning method for the breast lesion puncture point has the advantages that puncture point computation is exquisite; the theory is perfect; the result accuracy is higher; the operation is simple; and the computing speed is high.

The invention discloses a light rare earth ion absorbing material. The light rare earth ion absorbing material is prepared by the following primary raw materials: a carrier is 100 parts of a plant fiber (such as a wood fiber and a ramie fiber), an absorbing base is various kinds of condensed tannins (such as a oak tannin, a persimmon tannin and a pericarpium granati tannin). The light rare earth ion absorbing material comprises, by mass, 100-1000 parts of 0.8% oak tannin solution, or 100-1000 parts of 0.7% persimmon tannin solution, or 100-1000 parts of 0.8% larix gmelinli tannin solution, or 100-1000 parts of 0.5% pericarpium granati tannin solution. A cross linking agent is aldehydes (such as methanal and glutaraldehyde) or epoxy group (like dual-epoxy propane). The light rare earth ion absorbing material further comprises, by mass, 50-500 parts of 10% glutaraldehyde solution or 50-1000 parts of 3% dual-epoxy propane solution. The carrier and the absorbing base are cross linked in an acid solution, and an environmental-friendly material capable of absorbing the light rare earth ion is obtained. A maximum absorbing quantity is 427.0mg / g. Due to the fact that the light rare earth ion absorbing material only contains carbon (C), hydrogen (H) and oxygen (O) elements, after high temperature burning, recovering of the rare earth ion is convenient.

The invention provides a method for correcting geometric distortion of a text image. The method comprises the following steps of: extracting a text row, in a horizontal direction, of the text image, fitting the text row by using a B-spline curve to obtain a text row curve; estimating a vanishing point of a cylindrical surface straight bus, a text row tangent convergence line and a focal length parameter of a camera by using the tangent convergence symmetry of the text row curve; constructing latitude lines of an isometric grid for the fit text row curve by adopting a crossratio interpolation value; estimating a directrix of the cylindrical surface by using similar perspective projection transformation of the text row curve and constructing longitude lines of the isometric grid; estimatinga length-to-width ratio of the isometric grid by using the text row curves at the top end and the bottom end of the image; and mapping meshes of each isometric grid into a square grid through a deformation technology based on the grid to finish the correction of the geometric distortion of the text image. By the method, the problem that perspective distortion, nonlinear deformation distortion andcompound distortion of the perspective distortion and the nonlinear deformation distortion cannot be corrected at the same time in the prior art can be solved; therefore, total correction of the geometric distortion of the text image shot by the camera can be realized.

The invention relates to the technical field of ferrous metallurgy, and provides a method for refining the solidified structure of a continuously-cast steel billet based on the dimension and proportion of a target isometric crystal. The method is applied to the ferrous metallurgy process. As for molten steel with a certain qualified element, one or more metamorphic elements of a specified quantityare added at one or more nodes of the smelting, refining and continuous casting procedure according to the proportion and dimension of the target isometric crystal corresponding to working conditionparameters in the steelmaking process to cast the molten steel containing the metamorphic elements into a billet, so that the solidified structure of the steel billet is refined. According to the improvement mechanism of the method, particles of a specific type are generated after the metamorphic elements are added, and are used as a heterogeneous nucleation matrix for steel solidification, so that the nucleation density of the core part of the cast billet is improved, and the dimension and proportion of the target isometric crystal are regulated and controlled. By the adoption of the method,quantitative adjustment of the solidified structure of the continuously-cast steel billet is fundamentally achieved, the homogeneity and compactness of the solidified structure of the continuously-cast steel billet can be improved, the defects of solidification segregation, porosity, shrinkage and the like are overcome, and the processability and usability of steel are improved.