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2026. APPLICATION OF THE PJBL-STEM LEARNING MODEL ON SMOKELESS WASTE COMBUSTION DEVICE ON TEMPERATURE, HEAT, AND EXPANSION TO IMPROVE THE COGNITIVE LEARNING OUTCOMES OF STUDENTS OF CLASS VII SMPN 1 TAPUNG HULU. SPEKTRA: Jurnal Kajian Pendidikan Sains. 11, 1 (Mar. 2026), 186–199. DOI:https://doi.org/10.32699/spektra.v11i1.8900.