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KARAKTERISASI BAJA KARBON ST 37 AKIBAT PACK CARBURIZING ARANG CANGKANG KEMIRI DENGAN KATALISATOR SERBUK KERANG ALE-ALE PANTAI OESAPA KOTA KUPANG Marianus Wiskarjo; Wenseslaus Bunganaen; Jahirwan Ut Jasron
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 01 (2025): April 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i01.21001

Abstract

This study aims to determine the changes in microstructure and the increase in hardness of low-carbon steel (ST 37) through the pack carburizing process. The method used involves utilizing charcoal derived from candlenut shells as a carbon source and ale-ale shell powder as a catalyst. The experiment was conducted using 10 steel specimens, where 9 specimens underwent pack carburizing treatment with variations in catalyst composition (10%, 20%, and 30% CaCO₃) at a temperature of 900°C with a holding time of 2 hours, followed by a quenching process using 40% saltwater. The results of the study indicate that the pack carburizing treatment successfully increased the surface hardness of the steel significantly and caused a microstructural transformation from ferrite-pearlite in the initial material to martensitic structure on the carburized surface. These findings suggest the potential use of natural materials as an environmentally friendly alternative for carbon media and catalysts to enhance the mechanical properties of low-carbon steel.
Analisis Kualitas Bahan Bakar Marine Fuel Oil (MFO) Hasil Separasi pada Pembangkit Listrik Tenaga Diesel PT. Cogindo Daya Bersama – Kupang NTT Filisianus Lende; Ishak S. Limbong; Wenseslaus Bunganaen
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 12 No 02 (2025): Oktober 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/ljtmu.v12i02.27054

Abstract

Analysis of the quality of marine fuel oil (MFO) from the separation process at the diesel power plant of PT. Cogindo DayaBersama Tenau is needed to increase the calorific value of the MFO. Tests were conducted using a bomb calorimeter to calculate the energy capacity value, a centrifuge to determine the sediment volume, and observations made using a microscope to investigate the particles in the MFO. The test results (using a bomb calorimeter) showed that the energy value of the MFO that had not been separated and that had been separated was 7,776 cal/g and 8,298 cal/g (6.71% greater). The test results (using a centrifuge) also showed that the average sediment volume value of the MFO fuel that had not been separated and that had been separated was 6,273 cm³ (96.67% sediment) and 0.216 cm³ (3.33% sediment). Microscope observations showed that separated MFO was superior to unseparated MFO, as it contained more particles than unseparated MFO. These results indicate that the MFO separation process at PT Cogindo Daya Bersama has been carried out effectively
PENGGUNAAN ALAT PENGOLAH SAMPAH UNTUK PENINGKATAN PRODUKTIVITAS KELOMPOK KERJA BANK SAMPAH MUARA ABU KELURAHAN OESAPA BARAT Yeremias M Pell; Wenseslaus Bunganaen; Gusnawati Gusnawati; Adi Yermia Tobe Tobe; Jemssy R Rohi
Jurnal Pepadu Vol 7 No 1 (2026): Jurnal Pepadu
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/pepadu.v7i1.9136

Abstract

Bank Sampah Muara Abu (BSMA), terletak di TPS3R Oesapa Barat RT 001/RW 001, Kel Oesapa Barat, Kec. Kelapa Lima, Kota Kupang. Sampai saat ini BSMA sudah berhasil mengumpulkan dan mengirim 6 ton sampah. Jenis sampah yang diterima di BSMA adalah, berbagai sampah plastik, kertas, kardus, papan telur, dan kaleng berbahan aluminium. Ada 2 program yang dilaksanakan, yaitu pertama bidang manajemen dan kedua bidang produksi. Kegiatan bidang manajemen adalah pelatihan manajemen bank sampah bagi nasabah dan warga RT sekelurahan Oesapa Barat. Kegiatan dilaksanakan selama 4 hari dalam 4 minggu. Materi pelatihan adalah dasar-dasar pengelolaan bank sampah, yaitu pemilihan, pemilahan, pengemasan dan pengiriman. Prosedur kegiatan di bank sampah, dimulai dari penyetoran oleh nasabah, penyortiran, penimbangan, pencatatan dan penyimpanan. Kegiatan pelatihan pada tanggal 14, 21, 28 Juni dan 5 Juli 2025, bertempat di lokasi BSMA. Hasil pelatihan kegiatan pengabdian kepada masyarakat yang dilaksanakan tim PKM bersama Bank Sampah Muara Abu (BSMA) menunjukkan mampu meningkatkan pemahaman dan kesadaran lingkungan, serta meningkatkan sistem pengelolaan sampah mandiri dapat ditingkatkan melalui penerapan Teknologi Tepat Guna (TTG) yang sesuai dengan kebutuhan komunitas. Kegiatan di bidang produksi yaitu menyerahkan mesin pres sampah plastik dan kaleng, selanjutnya sosialisasi, pelatihan, hingga implementasi TTG kepada pengelola Bank Sampah Muara Abu (BSMA) dapat meningkatkan pemahaman dan keterampilan teknis. Dampak nyata dari kegiatan ini meliputi penurunan volume sampah sehingga proses pengemasan barang sebelum dikirim menjadi lebih mudah dan  volume pengiriman menjadi bisa lebih banyak, hal ini dapat mengurangi biaya transportasinya, peningkatan nilai ekonomis limbah anorganik, serta terciptanya lingkungan yang lebih bersih dan sehat.