Abstract: The present invention discloses a method for constructing a surface stress distribution cloud map based on critical refraction longitudinal wave detection. The method comprises: firstly, meshing a surface of a detected article; secondly, The mean transverse stress on different grid lines and the mean longitudinal stress on different grid lines were obtained by the critical refraction longitudinal wave detection method; next, calculating the equivalent stress of each mesh node according to the mean transverse stress on different mesh transverse lines and the mean longitudinal stress on different mesh longitudinal lines on the surface of the detected article; and finally, drawing a stress distribution cloud map of the surface of the detected article according to the equivalent stress. The present invention can obtain the stress situations at different points on the surface of the detected article.

Abstract: Provided are use of a rare earth amino acid complex, a polylactic acid composition and a preparation method thereof. The rare earth amino acid complex is formed by complexing a rare earth metal ion with an amino acid; a rare earth element corresponding to the rare earth metal ion is one or more selected from the group consisting of lanthanum, cerium and samarium; and the amino acid is at least one selected from the group consisting of proline, L-phenylalanine, tyrosine and tryptophan.

Abstract: The present invention discloses a method for constructing a surface stress distribution cloud map based on critical refraction longitudinal wave detection. The method comprises: firstly, meshing a surface of a detected article; secondly, The mean transverse stress on different grid lines and the mean longitudinal stress on different grid lines were obtained by the critical refraction longitudinal wave detection method; next, calculating the equivalent stress of each mesh node according to the mean transverse stress on different mesh transverse lines and the mean longitudinal stress on different mesh longitudinal lines on the surface of the detected article; and finally, drawing a stress distribution cloud map of the surface of the detected article according to the equivalent stress. The present invention can obtain the stress situations at different points on the surface of the detected article.

Abstract: A 400 kA high energy efficiency reduction pot, comprising: anode carbon blocks, anode busbars, crust breaking and feeding device, anode lifting device, girders and pillars, pot hooding and exhausting system, cathode busbar arrangement structure, cathode carbon blocks, cathode lining structure and cathode pot shell, the pot is characterized in that: 1) superstructure and portal-type pillars are supported by pipe truss girders structure; 2) anode carbon block has eight steel stubs to be configured in a symmetrical mode; 3) the superstructure has 24 double-anode assemblies or 48 single-anode assemblies, six alumina feeding points, and two fluoride salt feeding points; 4) sub-section fume collecting and exhausting system is installed between a horizontal hood plate and a feeding hopper; 5) a device for sealing the anode rod by means a negative pressure suction is provided; 6) a new lining structure of holding heat on bottom, dispersing heat from side, and adding expansion layer at the cathode end have been design