Pandemi Covid-19 telah menyebabkan pemerintan baik pusat maupun daerah menerapkan kebijakan Pemberlakukan Pembatasan Kegiatan Masyarakat (PPKM) untuk menekan laju penularan. Akan tetapi, penerapan PPKM berdampak kepada ekonomi masyarakat salah satunya di Kelurahan Jatimulya, Depok. Kebutuhan akan sabun cuci tangan meningkat dan di satu sisi hal ini menjadi peluang untuk mengembangkan usaha kecil dan menengah dalam memproduksi sabun cuci pakaian dan cuci tangan. Metode pengabdian kepada masyarakat ini meliputi tahap persiapan, tahap pelatihan, dan tahap evaluasi. Pada tahap persiapan dilakukan brain-storming untuk menentukan solusi dari permasalahan yang ada. Pada tahap pelatihan dilakukan pelatihan pembuatan sabun cuci pakaian dan cuci tangan menggunakan bahan-bahan kimia yang aman bagi manusia dan lingkungan. Setelah dilakukan evaluasi melalui kuesioner hasilnya masyarakat mampu untuk membuat sabun dan pengetahuan serta keterampilan mereka meningkat setelah mengikuti pelatihan.
Experiment to determine exhaust gas emission and combustion characteristics of a compression ignition generator was carried out. The experiment used single cylinder four strokes direct injection engine which was fuelled with diesel and palm oil methyl ester of B2 (blends 2% palm oil methyl ester with 98% diesel on a volume basis), B5, B7 and B10. The experiment was conducted at a fixed engine speed of 3000 rpm and 50% load with variety compression ratios of 16:1, 18:1, and 20:1and 22:1. Optimum compression ratio, influence of compression ratio on specific fuel consumption and thermal efficiency were examined. Palm oil methyl ester produce better output when the engine operate with variable compression ratio. Specific fuel consumption decrease, NOx increase and thermal efficiency increase when optimum compression ratio of engine is operated.
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