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All Journal ELKHA : Jurnal Teknik Elektro Jurnal Sains dan Teknologi
Yusmar, Yusmar
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Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Industrial & Manufacturing Engineering

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Optimasi Proses Fermentasi Optimasi Proses Fermentasi Senyawa Antifungi oleh Bacillus subtilis CAF3 Terhadap Athelia rolfsii (Curzi) C. C. Tu &Kimbr. Zam, Syukria Ikhsan; Taslapratama, Irwan; Yusmar, Yusmar; Febrina, Dewi
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 1 (2023): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i1.51317

Abstract

Bacillus subtilis CAF3 adalah bakteri endofit yang potensial dalam menghasilkan senyawa antifungi. Bakteri ini memiliki senyawa yang dapat menghambat pertumbuhan Athelia rolfsii. Produksi senyawa antifungi tersebut dapat ditingkatkan dengan melakukan optimasi pada proses fermentasinya. Pada penelitian ini dilakukan pemilihan media fermentasi, optimasi konsentrasi inokulum, optimasi pH awal media dan optimasi agitasi, selain itu juga dilakukan uji bioaktivitas ektrak hasil fermentasi serta identifikasi senyawa dengan menggunakan LC/MS. Hasil penelitian menunjukkan hasil fermentasi B. subtilis CAF3 memiliki daya hambat tertinggi terhadap A. rolfsii pada media tryptic soy broth (90,59%), konsentrasi inokulum 5% (90,59%), pH awal media 7 (90,59%) dan agitasi 110 rpm (90,59%). Ektrak etil asetat menghasilkan jumlah senyawa terbanyak (228 mg/L) dan memiliki bioaktivitas tertinggi (100%). Hasil LC/MS menunjukkan terdapat empat senyawa yang berbeda yaitu: T1.86 (392 m/z), T2.24 (261,59 m/z), T2.67 /mL (436,04 m/z) dan T3.28 (282,23 m/z). Fermentasi senyawa antifungi oleh B. subtilis CAF3 terhadap A. rolfsii optimum pada medium TSB, konsentrasi inokulum 5%, pH awal media 7 dan agitasi 110 rpm. Senyawa yang dihasilkan oleh strain ini merupakan senyawa yang berbeda dengan senyawa yang umum dihasilkan oleh B. subtilis.
Techno-Economic Study of a Hybrid Solar-Diesel-BESS Power System in Remote Island, Indonesia: Reducing Energy Costs and Carbon Emissions Umar, Abdullah; Husnayain, Faiz; Rahmat, Ade; Yusmar, Yusmar
ELKHA : Jurnal Teknik Elektro Vol. 17 No.2 October 2025
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/elkha.v17i2.93893

Abstract

The primary goal of this study is to conduct a comprehensive study of the viability of deploying a Photovoltaic-Diesel Hybrid system on Kaleroang Island, Central Sulawesi, Indonesia. The focus of this study is to identify the system configuration that is able to generate the lowest cost of energy and the lowest emissions. Five distinct scenarios are formulated for development. Scenario A encompasses fully diesel generator (DG), scenario B hybrid system DG and photovoltaic (PV), scenario C includes DG integrated with battery storage, scenario D includes DG, PV, and battery configuration, and scenario E includes PV with Battery. A comprehensive techno-economic study was performed to rigorously ascertain which of these system configurations demonstrates the highest competitiveness in terms of cost-effectiveness and operational viability. The results indicate that scenario D, characterized by a net present cost (NPC) of $5,460,903, exhibits a levelized cost of energy (LCOE) of $0.264/kWh, the lowest among the other scenarios. This configuration has been demonstrated to reduce fuel usage, thereby decreasing CO2 emissions by 32.9%. Furthermore, to ensure optimal results, it is imperative to calibrate the PV tilt angle within the range of 3Ëš to 6Ëš, with the orientation of the PV facing north.
Co-Authors Abdullah Umar, Abdullah Ade Rahmat, Ade Dewi Febrina Husnayain, Faiz Irwan Taslapratama Syukria Ikhsan Zam