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All Journal Media Kesehatan Masyarakat Indonesia PENELITIAN DAN KARYA ILMIAH JOURNAL OF EARTH ENERGY ENGINEERING JIPFRI (Jurnal Inovasi Pendidikan Fisika dan Riset Ilmiah) Abdimas Universal Journal of Applied Engineering and Technological Science (JAETS) Intervensi Komunitas: Jurnal Pengabdian Masyarakat Community Empowerment JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Jurnal Penelitian dan Karya Ilmiah Lembaga Penelitian Universitas Trisakti INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY Jurnal AKAL: Abdimas dan Kearifan Lokal Petro : Jurnal Ilmiah Teknik Perminyakan JURNAL ABDI MASYARAKAT INDONESIA (JAMIN) Scientific Contributions Oil and Gas
Mustamina Maulani
Fakultas Teknologi Kebumian Dan Energi, Universitas Trisakti, Jakarta, Indonesia
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Effect of Zinc Addition in Copper to Structure, Hardness, Corrosion, and Antibacterial Activity Lisa Samura; Mustamina Maulani; Cahaya Rosyidan; Kartika Fajarwati Hartono; Suryo Prakoso; Evi Ulina Margareta Situmorang; Daniel Edbert; Bambang Soegijono; Muhammad Yunan Hasbi; Ferry Budhi Susetyo
Journal of Applied Engineering and Technological Science (JAETS) Vol. 6 No. 1 (2024): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v6i1.6098

Abstract

Brass (CuZn) is widely used today due to better mechanical, thermal, and chemical properties. The present research fabricated CuZn alloy by adding various Zn (6, 9, and 12 wt.%) to the Cu using gravity casting. Casts CuZn alloy by adding various Zn to the Cu to investigate optimum composition were resulting highest inhibited of bacterial activity. In addition, the structure, hardness, and electrochemical behavior of the alloy were also investigated using XRD, Vickers hardness, and potentiostat equipment. XRD confirmed that CuZn alloy has an alpha phase, and a FCC crystal structure. The rise of the Zn content in the alloy led to an increase in crystallite size, a decrease in the hardness and a shift to a more negative OCP potential at 1200 s measurement. Enhancing the Zn content to 9 wt.% in the alloy lead to decrease the corrosion rate. Moreover, 24-hour post-contact observation found that the sample places removed remained clear of bacteria. The Cu6Zn sample successfully inhibited the growth of Escherichia coli in the 3rd hour, while Staphylococcus aureus was 100 % reduced in the 7th hour. The Cu6Zn sample could be used as an alternative material for medical equipment in ambulances.
USE OF ANOVA STATISTICAL METHOD IN EVALUATION OF TOFU WASTEWATER USED FOR SPIRULINA CULTURE MEDIUM ENRICHED WITH UREA AND NaHCO3 Mustamina Maulani; Gabriella Jasmine; Rosmalia Dita Nugraheni; Maman Djumantara; Asri Nugrahanti; Bayu Satiyawira; Cahaya Rosyidan; Lisa Samura; Harin Widiyatni; Pauhesti Pauhesti
INDONESIAN JOURNAL OF URBAN AND ENVIRONMENTAL TECHNOLOGY VOLUME 6, NUMBER 2, OCTOBER 2023
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/urbanenvirotech.v6i2.16933

Abstract

Indonesia has a large amount of liquid waste originating from the tofu industry. Currently, the treatment of tofu industrial wastewater is carried out using both anaerobic and aerobic methods, but both methods still have several weaknesses. In this study, the tofu industrial wastewater was utilized as a culture medium for Spirulina sp. to provide economic value from wastewater that can be used as bioethanol, pharmaceuticals, and food products rich in omega 3, chlorophyll, carotenoids. Aim: The growth of Spirulina sp. is closely related to the availability of macro and micronutrients as nutrients and the influence of environmental conditions, so this study was aimed to see the best variation of the addition of urea and NaHCO3 as additional nutrients to maximize growth and cell density of Spirulina sp. with tofu industrial wastewater media. Methodology and Results: This study was done by culvitating Spirulina sp in the growth media, measuring the Optical Density (OD), and analyzing quantitatively and using ANOVA on IBM SPSS Statistics version 20. The study indicated that adding urea and NaHCO3 to Spirulina sp. had no effect on cell density and growth rate. Treatment with addition of urea 0.36 g/500 ml without additional of NaHCO3 had the highest growth rate, 0.00852/day, and the highest cell density value on Spirulina sp. growth. Conclusion, significance, and impact study: The tofu liquid waste can be used as a new alternative used as fertilizer because in the liquid tofu waste, it provides the nutrients needed by Spirulina sp.
A System Dynamics Approach to Analyze Biodiesel Production and Oil Import Dependency in Indonesia Andry Prima; Bayu Satiyawira; Havidh Pramadika; Daud Asrun Nauw; Lisa Samura; Mustamina Maulani; Cahaya Rosyidan; Maman Djumantara; Djunaedi Agus Wibowo; Wiwik Dahani; Osama Jawaid Butt
Scientific Contributions Oil and Gas Vol 49 No 2 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i2.2019

Abstract

Indonesia’s persistent dependence on imported diesel fuel poses significant challenges to national energy security, fiscal stability, and exposure to global market volatility. In response, the government plans to implement a mandatory B50 biodiesel blending policy starting in 2026 to reduce diesel imports by leveraging domestic bioenergy resources. While higher blending mandates are often assumed to directly lower imports, existing studies largely rely on static or deterministic approaches that inadequately capture feedback dynamics and long-term uncertainty. This study addresses this gap by integrating system dynamics modelling with Monte Carlo simulation to analyze the impact of biodiesel blending policies on diesel import dependency under structural and parametric uncertainty. The model incorporates biodiesel production growth, domestic allocation after exports, diesel demand growth, and blending effectiveness within a feedback-based framework calibrated using historical data from 2013 to 2024. Simulation results indicate that the B50 policy consistently reduces diesel import requirements relative to the baseline; however, absolute imports may continue to rise without sufficient domestic supply expansion. Cumulative results show that by 2035, the B50 policy achieves import reductions of approximately 55–58 million kiloliters, increasing to around 60 million kiloliters when combined with accelerated biodiesel production growth. Monte Carlo analysis reveals robust medium-term outcomes by 2030 but increasing uncertainty by 2035. The findings highlight that blending mandates must be accompanied by sustained supply-side development to ensure long-term effectiveness and resilience.
Co-Authors Adji Nadzif Sidqi Andry Prima Arinda Ristawati Arinda Riswati Asih Retno Dewanti Asri Nugrahanti Astri Rinanti Atridia Wilastrina Awang Eka Novia Rizali Azizi, Masagus Ahmad Bambang Soegijono Bayu Satiyawira Cahaya Rosyidan Ciptadhi Tri Oka Binartha Daniel Edbert Daud Asrun Nauw Dian Octaviani Djunaedi Agus Wibowo Evi Ulina Margareta Situmorang Fadliah, Fadliah Faldo Matulessy Firman Aryandi Gabriella Jasmine Gihon Nugrahadi Hamid Nurrohman hanz seca rifansyah cipta maheza Harin Widiyatni Havid Pramadika Havidh Pramadika Havidh Pramadika Henry Young Kartika Fajarwati kartika fajarwati hartono Kuntjoro, Yanif Dwi Kurniawati, Riskaviana Larasati, Dinda Annissa M. Kemal Disaputra Maman Djumantara Mohammad Apriniyadi Mohammad Ischak Mohammad Ischak Muhammad Burhannudinnur Muhammad Burhannudinnur Muhammad Yunan Hasbi Osama Jawaid Butt Pauhesti Pauhesti Puri Wijanti Puri Wijayanti Raisha Marsha Rendi Amanda Rina Fitriana Rini Setiati Risyad Baihaqi Rosmalia Dita Nugraheni Samura, Lisa Sangayu Ketut Laksemi Nilotama Setiadi, Virginia Suryani Suryo Prakoso, Suryo Susetyo, Ferry Budhi Syamsul Irham Tuheteru, Edy Jamal Valentinus Galih Vidia Putra Waldah Nurjamilah Wawan Kurniawan Wegig Murwonugroho Wiwik Dahani Wiwik Dahani Yulia, Prayang Sunny Zakiah D. Nurfajrin