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All Journal Jurnal Pendidikan Fisika Undiksha Jurnal Sains dan Pendidikan Fisika Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Geografi, Edukasi dan Lingkungan Educatio Jurnal Otomasi Kontrol dan Instrumentasi Jurnal Pendidikan Fisika dan Teknologi Jambura Physics Journal Jurnal Fisika dan Terapannya Jurnal Sibermas (Sinergi Pemberdayaan Masyarakat) Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Jurnal Ilmiah Wahana Pendidikan Jurnal Jendela Pendidikan BIOCHEPHY: Journal of Science Education Jurnal Pijar MIPA KUANTUM BULETIN FISIKA
Jahja, Mohamad
Universitas Negeri Gorontalo
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Journal : BULETIN FISIKA

 1 
Analysis of the Hydrodynamic Characteristics of Limboto Lake Waters Based on Momentum Fluxes Khan, Mikail Gabriel Khan; Yunginger, Raghel Yunginger; Setiawan, Dewa Gede Eka; Jahja, Mohamad; Meidji, Icha Untari; Ahmadi, Haerul; Kusmayancu, Cucu; Nalle, Merpati Teodoris
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p02

Abstract

The waters of Lake Limboto show a decline in water quality, characterized by a decrease in clarity. Environmental factors, such as wind speed and direction, play a significant role in influencing the dynamics and quality of lake waters. To understand the influence of wind on water conditions, a comprehensive hydrodynamic study is required. This study focuses on analyzing the hydrodynamic characteristics of Lake Limboto waters based on momentum flux and its implications for lake water conditions. Wind speed and direction measurements were conducted on seven ducks in Lake Limboto waters during the period of November 1-3, 2024. Data were collected in the morning, afternoon, and evening. The lake's hydrodynamic characteristics were determined using formulas from the measured data. Hydrodynamic characteristics were interpolated using IDW cross validation leave one out and optimized with rank and neighboring point parameters. Wind direction was interpolated using IDW and converted into a vector field using Vector Field Layer Manager. It was found that the momentum flux by wind in Lake Limboto waters has a value range of 0-0.05 N/m2, and cross validation produced an RMSE of 0.003-0.01 N/m2. The interaction of momentum flux from wind and river flow causes sediment to be deposited in the coastal area of ​​Lake Limboto.
Development of an Incinerator with a Multi-Stage Condenser System as an Effort to Reduce CO₂ Emissions Gas from Plastic Waste Burning in Gorontalo City Yunginger, Raghel; Usman, Yusuf; Demulawa, Meilan; Tansa, Salmawaty; Jahja, Mohamad; Yunus, Muhammad
BULETIN FISIKA Vol. 27 No. 1 (2026): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2026.v27.i01.p03

Abstract

The increasing plastic waste volume in Gorontalo City is not balanced by a good management system, making people choose to burn their waste in open space. Not only makes a bad scene, this burning emits dangerous gases such as CO2 that contributes to poor air quality and climate change. This study has developed an environmentally friendly incinerator with a stacked condenser system that emits less CO2 gas. This incinerator consists of three main components: a combustion zone, as the place where plastic waste is burned; a chimney, for the flowing of gas; and stacked condensors, for cooling and keeping the gas before emitting it out. We test the incinerator with and without condensors based on the CO2 emission from 20 minutes' burning of 1.5 kg of plastic waste. The results show that an incinerator with a stacked condensor system can significantly reduce CO2 gas emissions by 18.88% more than an incinerator without condensors. This implies that incinerator with stacked condensors can be an alternative way to reduce CO2 gas from open-space waste burning on a small scale.
Co-Authors Abd Rahman Abd Wahidin Nuayi Abdi Gunawan Djafar Abdul Haris Odja Ahmadi, Haerul Aisyah Aisyah Amien, M.Mifthahul Andi Indra Wulan Sari Ramadani Andi Iskandar Andi Patiewere Metaragakusuma Asri Arbie Buhungo, Trisnawaty Junus Citron S Payu Daud Yusuf Devita Irawati Putri Dewa Gede Eka Setiawan Dewi Diana Paramata FARADILLA, FARADILLA Gafur, Nurfitri Abdul Hersiq Basri Indah Parawangsa Umar Indrawan Hermanto Abdjul Indriati Martha Patuti Irsan Rahman Irsan Rahman, Irsan Iskandar Zulkarnain Nasibu Ismail, Sri Yanti N. Kasim Dihuma Khan, Mikail Gabriel Khan Kurniasari, Septiana Kusmayancu, Cucu Latief, Muh. Fachrul Masayuki Sakakibara Masri Kudrat Umar Matalapu, Irawan Meidji, Icha Untari Meilan Demulawa Mohamad, Humaira Muhammad Yunus Muhammad Yusuf Muksin, Engelina Mursalin Mursalin Mursalin . Nalle, Merpati Teodoris Ndune, Indah Sari Nurfadillah Abdullah Rahim, Niarti Ritin Uloli Saleh, Melisa Damayanti R. Salmawaty Tansa Sari, Widya Priskila Soeharto Soeharto Supartin Supartin Supu Idawati Supu, Idawati Supu, Idawaty Suwaldi Mopangga Tang, Bunga Tansa , Salmawaty Tirtawaty Abdjul Tsutomu Yamaguchi Usman, Yusuf Yunginger, Raghel Yunginger Zakaria, Christina T.