[en] The technical characteristics and application conditions of multi slicing-and-caving method are introduced. Based on application of mining practice in a uranium deposit, the advantages, disadvantages,and main technical and economic indicators of multi slicing-and-caving method are analyzed. Some corresponding improvement measures are suggested simultaneously. Furthermore, the technical feasibility, safe reliability and economic rationality of the improved mining method are illustrated consequently. (authors)

[en] Highlights: • A data-driven method for baseline correction based on the empirical mode decomposition algorithm. • The mode-mixing effect is avoided by a coarse-to-fine scheme. • The proposed scheme can be adaptive to different analytical instruments with better performance under minimal user intervention. Baseline correction is an indispensable step in the signal processing of chemical analysis instruments. With the increasing demand for on-site applications, a variety of analytical instruments require a more friendly, rapid and adaptive baseline correction method. In this paper, a data-driven and coarse-to-fine (DD-CF) baseline correction scheme mainly based on the empirical mode decomposition (EMD) algorithm is proposed. For eliminating the mode-mixing effect of the original EMD, the proposed method firstly obtains a coarse baseline estimation using automatic peak detection, elimination and interpolation; and the EMD is applied on the coarse baseline to get a fine baseline finally. We have compared this method with the adaptive iteratively reweighted Penalized Least Squares algorithm (airPLS) and the sparse representation baseline correction methods using simulated signals and experimental signals from different analytical instruments. Results indicate that the proposed DD-CF scheme can effectively estimate the baseline more accurate than the comparing methods for varies of analytical signals such as mass spectrometer, ion mobility spectrometer, gas chromatograph, etc. Furthermore, with signals of different length, different peak distributions and even from totally different instruments, the proposed method requires minimal user intervention, in which the parameters of the comparing methods should be adjusted for a wide range.

[en] Rolled Zn-0.8Li-0.2Ag(wt%) alloy as candidates for biodegradable materials. The biodegradable behavior of Zn-0.8Li-0.2Ag alloy in different solutions (Ringer’s, DMEM, SBF and DMEMp) was investigated. The cytotoxicity of Zn-0.8Li-0.2Ag alloy and its antibacterial properties against staphylococcus aureus, enterobacter faecalis and candida albicans were evaluated. The results showed that Zn-0.8Li-0.2Ag alloy consists of zinc matrix and a LiZn₄ secondary phase. The presence of Cl⁻ causes locally corroded of Zn-0.8Li-0.2Ag alloy in Ringer’s solution, and its corrosion resistance is lower than that of the alloy which is uniformly corroded in other solutions containing CO₃ ²⁻ and PO₄ ³⁻. Zn-0.8Li-0.2Ag alloy is non-toxic and exhibits better antibacterial properties than the experimental reference group without silver. (paper)

[en] The microstructure, texture, tensile strength, and corrosion behavior of Al–Mg–Sc–Zr alloy at different annealing temperatures were investigated using SEM, TEM, XRD, and dual potentiostat techniques. Results show that in the process of alloy homogenization annealing, the Al–Mg–Sc–Zr alloy is able to precipitate spherical particles of Al₃(Sc, Zr) with a diameter of about 10 nm and a lattice constant of 0.41 nm, which can pin dislocation, hinder grain boundary movement, and suppress recrystallization. Moreover, the dislocations move to the grain boundaries during the annealing process, leading to the formation of dislocation walls. Remarkably, the sub-crystals are also formed as the grain boundaries parallel to {101}, and move to become parallel to {111}. The texture mainly consists of copper, brass, S, and R, and only a small amount of recrystallization cube texture. Furthermore, under the influence of the microstructure and texture, the strength of the alloy decreases, the plasticity increases, and the corrosion resistance first increases and then decreases. The optimal mechanical properties and corrosion resistance were obtained when the annealing was done at 300 °C for 1 h.