Study of nickel leaching using sulfuric acid and phosphoric acid on the selectivity of low-grade laterite nickel ore under atmospheric conditions has been successfully carried out. In this study, the laterite nickel leaching process was carried out by varying the solution concentration and operating time. The concentrations of sulfuric acid and phosphoric acid solutions were varied at 5 M and 6 M concentrations, while the operating time was varied at 4 hours and 6 hours. For other operating conditions, it is kept constant with an operating temperature of 90 ℃, pulp density 15% w / v, particle size ≤ 200 mesh. After that, the analysis stage was carried out using an atomic absorption spectroscopy (AAS) tool to determine the nickel content in the sample. The results showed that the highest nickel recovery was obtained at the concentration of 5 M sulfuric acid solution of 2.60% and 5 M phosphoric acid of 2.59% with the optimum operating time at 4 hours of operating time.

Most of the coal is used as fuel in power plants,cement industry and metal processing industry. Use of coal as fuelwill depend on the quality of the coal used. The main parameters thatdetermining the quality of coal is the calorific value. Meanwhile, the calorific value of a coalwill depend on several parameters, namely total moisture, total sulfur andash content. This study aims to determine the effect of the relationship betweenthe content of some of these parameters on the calorific value of a coal. Analysisperformed using the American Society for Testing and Materials (ASTM).The stages of this analysis include sample preparation, air dry loss testing, residualmoisture, total sulfur, ash content and gross calorific value. The results of the analysis showthat the higher the total moisture content, total sulfur and ash content, the higher thecauses the lower the calorific value of a coal.

Tujuan penelitian ini adalah menganalisa bagaimana menciptakan strategi pemasaran school branding setelah masa pandemi usai. Dengan menciptakan hal tersebut akan diketahui faktor pendukung dan penghambat dan dampaknya terhadap terciptanya strategi dan peningkatan daya saing sekolah. Metode penelitian ini menggunakan pendekatan kualitatif dengan pengumpulan data melalui wawancara dan studi dokumentasi. Hasil penelitian menunjukkan langkah langkah menciptakan strategi pemasaran yang dilakukan sekolah membangun school branding dalam meningkatkan daya saing sekolah meliputi (1) Nilai Akreditasi Sekolah, (2) Program keahlian unggulan, (3) ISO 9001:2008, (4) Prestasi sekolah akademik dan non akademik. Faktor yang mempengaruhi menciptakan daya saing sekolah adalah (1) Kualitas SDM guru, (2) Promosi sekolah yang bagus. Ditemukan faktor penghambat menciptakan strategi pemasaran school branding adalah (1) Transisi Masa Pandemi (2) Kurangnya kontak sosial secara langsung dengan calon konsumen (3) Kurangnya kompetensi khusus yang merupakan tindakan yang menunjukkan kelebihan sekolah yang lebih baik dari pada pesaing.