Two new quaternary Cr_xTi_0.75Mo_0.75V_1.5−xAlC₂ (x = 1.25, 1) MAXs and Cr_0.75Ti_0.75Mo_0.75V_0.75AlC₂ are synthesized by hot pressing. Interestingly, an unprecedented transition in M-site atomic occupancy from out-of-plane order to solid solution is observed along with the composition variation, which also increases the configurational entropy from medium- to high-entropy. Through experimental observation and theoretical calculation, the influence of the atomic distribution on their properties is analyzed. Eventually, about 40% increment on the Vickers hardness than that of the Cr₂TiAlC₂ and low thermal conductivities are detected from the three MAXs, which can be ascribed to the solid solution strengthening effects and the enhanced scattering of both electrons and phonons from the high-entropy structure.

Faced with the persistent challenge of Non-Line-of-Sight (NLOS) errors in urban Global Navigation Satellite Systems (GNSS) navigation, researchers have introduced an innovative solution powered by Artificial Intelligence (AI).

The Chinese government’s 2020 plan for education evaluation reform emphasizes digital transformation and Big Data integration. This paper, drawing on the experience of Minzu University of China as a case study, analyses existing research and constructs a Big Data-based education evaluation model. The model considers evaluation elements (subjects, content, and methods) and processes (data acquisition, analysis, and feedback) and proposes a comprehensive approach for full business, full process, and full factor evaluation. Challenges, such as data integration and teacher training, are addressed, and practical pathways for implementation are suggested, emphasizing application scenarios, data security, and continuous teacher development.