This study is motivated by the need to improve the quality of learning, as indicated by the Indonesian Education Report Card in 2024. PMM (Platform Merdeka Mengajar) is a digital platform designed to support teachers in implementing the Merdeka Curriculum in Indonesia. The study aims to examine the influence of PMM literacy and teacher learning leadership on teacher performance, with Professional Learning Community (PLC) effectiveness serving as a mediating variable. Data were collected from 321 teachers, selected from a population of 1,626 teachers at public junior high schools in Kendal Regency, Indonesia. The data were analyzed using Structural Equation Modeling with Partial Least Squares (SEM-PLS), employing SmartPLS 4.1 as the analysis tool. The results suggest that PMM literacy and PLC effectiveness have direct effects on teacher performance, while teacher learning leadership does not have a direct effect. However, both PMM literacy and teacher learning leadership have significant indirect effects on teacher performance through PLC effectiveness. This study highlights the practical need to support PLC to promote PMM literacy and teacher learning leadership, in order to enhances teacher performance

Leaf springs are one of the suspension systems that are still widely used in various modes of transport such as cars and trucks. The spring functions to support the load and reduce vibration from operational activities. This study aims to analyse the bending strength and hardness of steel leaf springs of trucks and cars resulting from tempering heat treatment. The three point bending method was used as the flexural strength testing method and the Rockwell C Hardness method testing was used for hardness testing with leaf springs in raw, tempered 460°C, and tempered 510°C conditions. From the results of the study, the highest average bending strength value of 3733,55 MPa was obtained and an average roughness value of 31,8 HR was obtained for the 510°C tempered truck leaf springs. This also applies to the 510°C tempered car leaf springs, where the average bending strength value obtained is 3392,65 MPa and the average hardness value obtained is 29,5 HR. Thus, it is recommended that tempering heat treatment that can be applied to truck and car leaf springs be carried out at 510°C to increase the bending strength and ductility of the leaf springs.

Working in the mining sector has a fairly high occupational risk, especially for mechanics in carrying out heavy equipment maintenance. One of the maintenance carried out is the replacement of the excavator bucket. The excavator bucket is mounted on the end arm of the excavator which is connected using a locking pin. The pin installation process is carried out by hitting with a hammer, where this process has a number of occupational risks such as being hit, exposed to material, and fatigue which can result in work accidents. This study aims to minimize the occurrence of occupational risks by finding out the relationship between the use of special tools on safety and job duration for the locking pin installation process. The method used is experimental quantitative method and using fishbone diagram. By using a special tool, the installation of locking pins becomes safer because the factors that cause accidents when using palju can be eliminated and the manpower required becomes more efficient, but in terms of time it requires a longer duration due to the limitations of the tool that requires adjustment several times when used.