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Abstract. Iron oxide has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Iron oxide (Fe2O3) has potential applications in catalytic reactions in electronic devices such as semiconductors, paint formulations, and lithium rechargeable batteries. Fe2O3 can be synthesized through the process of stirring, decomposition of organic iron, sol-gel, combustion, and evaporating solvents. Most of the methods used involve several steps and take a long time. The aim of this research was to investigate the phase and morphology characterization of iron oxide (Fe2O3) powder with solvent ethylene glycol after being sintered for 1 hour, 2 hours and 3 hours. The characterization tools utilized were XRD, SEM-EDX, and FTIR. The results of XRD analysis showed that the Fe2O3 sintered for 1 hour had the smallest crystallite size with a diameter of 21.05 nm. In the XRD test, the beam of X-ray was shot directly at the grain being tested. The results of SEM analysis showed thatthe Fe2O3 sintered for 1 hour produced the best result due to its crystallite size of 12.36 nm and hada shape of homogeneous nanosphere; the duration of sintering indeed had a great influence on the grain size of iron oxide (Fe2O3). In addition, the results of the elemental composition analysis indicate that the longer the sintering process, the higher the concentration of O but the lower the Fe.

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Aluminum 6061 has the advantages such as good formability, corrosion resistance and lightweight, but it also has weaknesses, such as its hardness andwear resistance are relatively low, thus anodizing process is conducted to increase its hardness and wear resistance. The anodizing process can also produce a more attractive appearance and texture of metal. It alsocan increase the resistance of surface friction. The anodizing technique isa metal plating processbased on the formation of an aluminum oxide coating through controlled oxidation. The quality of the anodizing product is determined by the thicknesses of the coating formed. This study aimed to determine and analyze the mechanical properties and thicknesses of the coating on the surface of aluminum 6061 due to anodizing process. The method used in this research was a laboratory experimental method, with variations of the anodizing solution, voltage, and immersion time. The solutions used in this study were 100% 1M sulfuric acid, phosphorus acid, and nitric acid. The voltages used in this study were 15V and 30V, while the immersion time variation of the anodizing process was carried out at 10 minutes and 30 minutes. The mechanical properties of anodizing aluminum 6061 were tested using hardness and wear resistance tests. The data that had been obtained were analyzed using the descriptive analysis method. The results showed that the highest hardness rate was obtained in the treatment with the use of 100% H2SO4 anodizing solution, with a voltage of 15V, which was immersed for 30 minutes. The highest hardness reaching 106.47 HV was found in specimen number 2, with a wear resistance of 17153.09 m/g, and a coating thickness of 57.025 µm.

“Kampus Mengajar” aimed to assist the process of teaching and learning at the elementary-junior high school level through technology adaptation, teaching numeracy and literacy, and administrative procedures. The deployment of students during the COVID-19 pandemic, which required learning to be conducted online, will significantly help the school, especially related to technology adaptation. However, this program was less attractive to students and lecturers at the University of Merdeka Malang; this was evident from the relatively small participation of students and lecturers at batch 1. In the initial observation, the “Kampus Mengajar” was less attractive because it did not follow the existing scientific competencies at the University of Merdeka Malang; thus, it was difficult to conduct a credit conversion process. This low participation affects the IKU ranking, where the University of Malang is in cluster 3 with 75.21. The purpose of this study was to evaluate the implementation of the “Kampus Mengajar” as an effort to increase the participation of the University of Merdeka Malang academic community. This research was conducted using an exploratory survey research method. Data were obtained through questionnaires and FGDs. The results showed that the implementation of the Kampus Mengajar at the University of Merdeka Malang had been running through socialization at the central level to the study programs. There was an increase in participation in each batch, both lecturers and students.