In order to study the effects of pores in surface-coated carbon layer on the rate performance of graphite cathode materials, a small amount of boric acid was added to generate gasification and effusion effect of boric acid during the softening stage of the coated asphalt. Then, a carbon layer with certain pores was formed on the surface of natural graphite tailings through carbonization, and graphite cathode materials with various proportions of pores were obtained. The results show that boric acid forms a carbon layer on the surface of particles containing mesoporous and macroporous pores. A higher proportion of mesopores in the surface carbon layer leads to more diffusion channels for Li⁺ in the carbon layer L_C, and lower diffusion impedance of Li⁺. In that case, the rate performance and cycling performance of the material are enhanced.

Nano ITO powders prepared by chemical coprecipitation plus calcination process were used as raw materials to prepare ITO sputtering target by molding and cold isostatic pressing, as well as conventional sintering. The effects of molding pressure on the relative density, resistivity, and grain size of ITO target were investigated. The results show that with the molding pressure of 60 MPa and the appropriate sintering conditions, the prepared ITO target has the relative density of 99.81% and resistivity of 1.707×10^-4 Ω·cm, with an average grain size of 7.62 μm. The research results can provide reference for densification and large-scale production of ITO sputtering targets.

As for the precision rolling process, a thickness prediction model was constructed for precision rolling exit by introducing a time domain convolutional network algorithm. The feature information of time-series data of the precision rolling process was extracted by using this time-domain convolutional network model, and the prediction performance of the precision rolling exit thickness was improved by optimizing the structure and parameters of the model. The simulation results of the actual steel dataset show that the proposed time-domain convolutional network algorithm, compared to traditional methods, has significant advantages in evaluation indicators, such as root mean square error, average absolute percentage error, and coefficient of determination, which can provide critical information for decision of on-site engineers.

The influence of Mg and Si content on the types and properties of actual precipitates in Al-Cu-Mg-Ag-Si alloy was investigated. The results show that a large amount of S phase and coarse second phases exist in the Al-Cu-Mg-Ag-Si alloy with high Mg content and regular Si content; the common θ phase and Ω phase are precipitated in the low-Mg and low-Si alloy; the common second phases in 6xxx aluminum alloys, such as σ and β″phases, appear in the alloy with low Mg content and regular Si content, and also fine and dispersed θ phases are precipitated in the alloy, which results in excellent strengthening effect of the alloy. Both Si and Mg greatly alter the precipitation sequence of the alloy, and the effect of Si cannot be offset by increasing Mg content. The addition of Si significantly inhibits the precipitation of Ω phase, while a considerable increase of Mg content can promote the precipitation of S phase.

The effects of aging treatment on the microstructure and properties of Al-Zn-Mg-Cu extruded bars were investigated. The results show that the alloys treated by two-stage aging and re-aging (TSR), retroregression and re-aging (RRA), and non-isothermal aging (NIA), compared to the treatment with T73, all present better intergranular corrosion (IGC) resistance, with the maximum corrosion depth down from 70 μm to 19, 48, and 30 μm, respectively. Compared to those treated by RRA and NIA, the TSR-treated alloy has the similar tensile strength and yield strength, but obviously superior IGC. After the treatment of T73, TSR, RRA, and NIA, the alloy has its grain boundary precipitates with average size of 27.7, 39.2, 31.6, and 25.5 nm, respectively, and matrix precipitates with average size of 8.1, 10.2, 10.9, and 11.0 nm, respectively.

In order to study the corrosion mechanism of welded material of Q370qENH weathering steel by submerged arc welding (SAW), experiments were conducted on immersion corrosion and electrochemical corrosion of Q370qENH substrate samples and weld seam samples after SAW process, and the morphology and composition of the surface rust formed after immersion corrosion were characterized. The results indicate that the corrosion resistance of the weld seam of Q370qENH by SAW process is lower than the substrate, and its electrochemical impedance is 38% of the substrate. The reason for the lower corrosion resistance of weld seam than the substrate and the formation mechanism of surface rust were all analyzed. The research results can provide scientific and theoretical basis for the safety assessment for the service of weathering steel in engineering projects of steel bridges for high-speed railway, as well as its following maintenance.

The effect of strain rate on susceptibility of TB6 titanium alloy to adiabatic shear was investigated through dynamic loading of hat-shaped specimen of TB6 titanium alloy by using a split-Hopkinson compression bar at room temperature. The following results are obtained: all four groups of specimens exhibit obvious strain hardening effects at a strain rate of 1 950-2 510 s^-1; with the rising of adiabatic temperature, adiabatic shear bands (ASBs) form in all four groups of specimens due to thermoplastic instability; there is no obvious deformation gradient in the transition zone between the matrix and the adiabatic shear band due to the influence of impact load and material grain size; the equiaxed grains with size of 100 nm are formed in the hot shear band due to rotational dynamic recrystallization. By observing the metallographic structure, characterizing the adiabatic shear sensitivity, and calculating the expansion energy, it can be inferred that the susceptibility of TB6 titanium alloy to adiabatic shear increases with the increase of strain rate.

Fe₃O₄@SiO₂@IL was prepared by immobilizing imidazole based ionic liquids on the surface of magnetic nanoparticles with impregnation method, and was then used to remove Hg²⁺ in the water. The effects of pH value, adsorption time, and adsorbent dosage on the Hg²⁺ removal rate were investigated. The results show that Fe₃O₄@SiO₂@IL can have a wide application, and Hg²⁺ removal rate can exceed 99.1% with pH of 7.2-9.5. Fe₃O₄@SiO₂@IL presents a high rate of Hg²⁺ adsorption, and the adsorption can reach equilibrium within 90 minutes. For 25 mL Hg²⁺ solution with a concentration of 2 μg/mL, Hg²⁺ can be completely removed by adding 20 mg of adsorbent. The adsorption isotherms of Fe₃O₄@SiO₂@IL indicate that the saturated adsorption capacity of the adsorbent for Hg²⁺ is 548.37 mg/g.

A statistical analysis was conducted for patents on acid-free descaling of strip steel in terms of the number of patents and main applicants, and those patents on typical acid-free descaling process for strip steel were specially discussed. Finally, the developing trend of acid-free descaling technology for strip steel in the future is presented, which can provide reference for R&D and application of acid-free descaling technology.

Rare earth elements are important resources for national development and industrial upgrading, and it is critical to establish an improved rare earth policy system. Based on the constructed analysis framework of rare earth policies, 48 rare earth policies issued from 1985 to 2022 in China were evaluated by using text data mining, social network and policy modeling consistency (PMC)-index model from three aspects, including the evolution process of rare earth policies, policy network and quantitative policy analysis. It is found that the evolution of China's rare earth policies can be divided into four stages, among which standardizing the exploitation procedure for rare earth resources and rectifying the order of rare earth market have always been the focus of China's rare earth policies. A policy network has been initially constructed, but there is poor correlation among policies and there are many isolated policies, which indicates that the correlation among policies needs to be strengthened. The overall design of the polices is reasonable, but there are some deficiencies in incentive measures and effectiveness. Finally, some suggestions are put forward to optimize and improve China's rare earth policies based on the features and shortcomings.