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In this work, we developed a technology for growing a single crystal of a ternary compound, using the Atomic Force Microscope (AFM), we studied the surface microrelief in 2D and 3D modes, using X-ray diffraction (XRD) analysis, determined the parameters of the unit cell of this phase and revealed that it crystallizes in tetragonal symmetry with lattice parameters $a=8.345$ Å and $c=6.8352$ Å, space group I4/mcm. Using the density functional method, using the ABINIT software package, using the Troiller–Martins pseudopotentials in the basis of plane waves, the band structure was calculated, the origin of the valence and conduction bands was determined. It was revealed that this phase is a direct-gap semiconductor with a bandgap of 0.56 eV. The parameters of the InGaTe₂ unit cell were calculated by the pseudopotential and linearized attached plane wave (LAPW) methods, the theoretical and experimental values of the lattice parameters are in good agreement. Based on the band structure, the effective masses of electrons and holes are determined. It is shown that the tensors of the inverse effective mass for both extreme have a diagonal form.

FE-SEM and TEM images were used to identify the size of 3C–SiC nanoparticles. Simultaneously, HRTEM and Selected Area Electron Diffraction (SAED) analyses were conducted in order to determine the crystalline nature of the nanoparticles. Moreover, lattice parameters of 3C–SiC nanoparticles have been studied by SAED and XRD analyses. The possible existence of other modified polytypes of silicon carbide was investigated in the experimental sample. The 2$\theta$ angles were determined according to the lattice parameters. Lattice constants and lattice angles for nanocrystalline 3C–SiC particles were defined from the experiments.

Although there is much discussion on the evaluation of the dissemination ability of sci-tech periodicals, there is no perfect evaluation method system in the existing studies, and especially the evaluation model is not operable. This paper converts the qualitative evaluation of the dissemination ability into a multi-criteria decision-making problem, and proposes a research method of sci-tech periodicals dissemination ability based on hesitant fuzzy linguistic. Firstly, this paper systematically combs the research progress of the evaluation of dissemination ability of sci-tech periodicals and multi-criteria decision-making under uncertainty. Then, a multi-criteria decision-making method based on hesitant fuzzy linguistic correlation is proposed, which fully considers the preferences of decision makers and effectively integrates the incomplete compensation hypothesis. Finally, the periodical topic planning, knowledge popularization recognition, publishing market operation ability and supporting discipline construction are selected as empirical conditions to verify the applicability and effectiveness of the model. At the same time, in order to make the empirical results more objective and scientific, the density clustering results of the questionnaire are used instead of the decision-maker membership score in the evaluation of dissemination ability. Theoretical analysis and empirical results show that the method proposed in this paper can be effectively applied to the evaluation of the dissemination ability of sci-tech periodicals.

Expanded flyash clay aggregate (EFCA) is a promising sustainable alternative to coarse aggregate in concrete. Concrete specimens with conventional natural aggregate and EFCA as coarse aggregates were prepared separately and exposed to elevated temperatures of range 200°C, 400°C, 600°C and 800°C, observed for surface changes like change in color and formation of visual cracks, tested for loss in mass, strength and water absorption, analyzed by XRD for mineralogical changes through variation in chemical composition. Specimens when exposed up to 400°C has not shown any notable changes in the above property, beyond which strength of both specimens started to decrease gradually, at higher temperature EFCA mix showed loss in mass of 4.5% compared with normal concrete, visual observation of specimen surface showed EFCA specimens sustained cracks till 600°C. EFCA mix also showed a constant rate of water absorption. Concrete with EFCA showed consistently higher compressive strength at higher temperature up to 400°C and found satisfactory in all aspects tested made EFCA as coarse aggregate in concrete as a sustainable alternative to natural aggregates.

The pinion and crown are key components in an automobile’s transmission system. The surface characteristics of high-carbon steel have a major effect on differential gear action. As a result, gear damages and increased downtime for repairs are experienced over time. To address this issue, manufacturers have started using alternative materials such as aluminium alloys and composites to improve the durability and efficiency of the transmission system. Engineers can now adjust the design of crown and pinion gears for best performance thanks to developments in computer-aided design and simulation tools. This has led to the development of more compact and lightweight transmission systems that offer better fuel efficiency and acceleration. However, these innovations come at a cost, as they require specialized manufacturing processes and materials that can be expensive. Nevertheless, the benefits of improved transmission systems are clear, as they can significantly enhance the driving experience while reducing maintenance costs over time. As technology continues to evolve, we can expect further improvements in material design that will further enhance crown pinion performance and reliability. To overcome these failures and increase the material’s life, high-carbon steel is preferred. In this study, high-carbon steel composites with various material proportions (100% to 0%, 99% to 1%, and 97.5% to 2.5% of high-carbon steel, and silicon carbide, respectively) are experimentally investigated and evaluated for better structural strength and surface behavior of the crown pinion. The crown pinion is thoroughly analyzed using salt spray corrosion testing and X-ray diffraction analysis. According to the results, the proportion of 97.5% high carbon steel with 2.5% silicon carbide has better surface properties than the other proportions, and it is also recommended to make the crown pinion for future uses.