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Yunita Djamalu
Universitas Negeri Gorontalo
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 Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Transportation Other

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Uji Kinerja Mesin Panen Padi Menggunakan Mesin Brush Cutter Djamalu, Yunita; Djafar, Romi; Udjaili, Sunandar
JTPG (Jurnal Teknologi Pertanian Gorontalo) Vol 8 No 2 (2023): Jurnal JTPG (November)
Publisher : PROGRAM STUDI MESIN DAN PERALATAN PERTANIAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30869/jtpg.v8i2.1192

Abstract

Penelitian ini bertujuan untuk memodifikasi alat pemotong rumput menjadi mesin pemanen padi tipe brush cutter dengan modifikasi yang lebih aman dan mudah digunakan serta mengevaluasi unjuk kerja mesin tersebut. Material teknik yang digunakan meliputi pelat aluminium, bilah bundar yang dilapisi karbida, sabuk operator, pipa aluminium, kain, dan mesin. Mesin pemanen padi tipe brush cutter terdiri dari mesin YSI-328, handle, batang penghubung, sayap pemandu, mata gergaji, tali selempang, dan pelat pengaman kaki. Tipe mata pisau berbentuk lingkaran terbuat dari karbida dengan jumlah mata pisau pemotong sebanyak 42 buah di sisi lingkaran. Ujung mata pisau memiliki ukuran 4x3x2 mm dengan kecepatan putaran antara 3500-4500 rpm. Mesin ini memanfaatkan kecepatan dorongan, yakni nilai untuk memotong empat rumpun padi dengan jarak tanam 25 cm atau setara dengan lebar kerja 100 cm, dimana gerakan mendorong dimulai dari kanan ke kiri dengan waktu berkisar antara 0,7 hingga 1 detik. Mesin ini dilengkapi tali selempang yang terbuat dari kain dengan panjang 2 m. Selain itu, mesin ini juga memiliki pelat pengaman kaki yang terbuat dari aluminium dengan dimensi 50 x 10 cm dan tebal 2 mm. Hasil pengujian pada luasan 50 m2 diperoleh kapasitas aktual memadai sebesar 3,33 m²/menit. Pada luasan tersebut, mesin panen padi hasil modifikasi memerlukan konsumsi bahan bakar sebanya 0,5 liter dengan efisiensi kerja mesin sekitar 82-85%.
PEMANFAATAN LIMBAH ORGANIK SEBAGAI ENERGI ALTERNATIF MENGGUNAKAN REAKTOR GASIFIKASI DOWNDRAFT Hasan Harun, Ervan; Ilham, Jumiati; Djafar, Romi; Djamalu, Yunita
Journal Of Renewable Energy Engineering Vol. 2 No. 2 (2024): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v2i2.43

Abstract

Organic waste from coconut shells, corn cobs, candlenut shells, and lamtoro wood is often found in the Gorontalo region. The gasification of organic waste has the potential to reduce organic waste and produce gas for various applications, including heating, power generation, and industrial raw materials. The research aims to determine the gas composition of the downdraft gasification process from organic waste from coconut shells, candlenut shells, corn cobs, and lamtoro wood, to determine the rate of fuel consumption, and to determine the calorific value. The method used is an experimental method. Test results using a downdraft gasifier reactor with 5 kg of fuel. The average H2 value obtained from the test results for coconut shells was 12.46%, candlenut shells 13.01%, corn cobs 9.3%, and lamtoro wood 15.95%, the highest H2 value from several of these samples was obtained from lamtoro wood with the highest percentage was 15.95%, the average O2 value obtained was coconut shell 8.86%, candlenut shell 6.37%, corn cob 2.61%, lamtoro wood 5.22%, the average CH4 value was shell coconut 7.88%, candlenut shell 4.05%, corn cob 8.03%, lamtoro wood 7.32%, average CO value for coconut shell 0.56%, candlenut shell 0.05%, corn cob 10 .71%, lamtoro wood 0.05% while the average N2 value obtained was 70.21% coconut shell, 76.49% candlenut shell, 69.25% corn cob, and 71.44% lamtoro wood. The findings compare four organic wastes as alternative energy using a downdraft gasification reactor. The conclusion from this research is that the best gas composition is from corncob organic waste with H₂, CH₄, and CO of 28.05%, the longest burning rate on corncob samples is 23.11 grams/minute and the highest calorific value test is on lamtoro wood samples with results reaching 4,340 cal/gram.
PERBANDINGAN DESAIN PENGERING BERBASIS EFEK RUMAH KACA VARIASI CEROBONG PENGHAWAAN: IMPLEMENTASI PADA MASYARAKAT LOKAL Djamalu, Yunita
Journal Of Renewable Energy Engineering Vol. 2 No. 2 (2024): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v2i2.45

Abstract

Greenhouse effect-based dryers are an efficient and environmentally friendly technological solution to improve the quality and added value of agricultural and fishery products. This research aims to analyze the comparative technical and economic performance of three variations of ventilation chimney designs, namely conventional, thermal, and multidirectional, in their implementation in local communities. Research methods include field experiments to measure technical parameters, such as temperature, humidity, drying time, and airflow speed, and economic analysis to calculate investment costs, payback period, and net profits. The results showed that the thermal chimney provided the best performance with an average temperature of 50°C, drying time of 21 hours, and high airflow efficiency, suitable for rural areas. Multidirectional chimneys are more flexible against unstable wind conditions, making them ideal for coastal areas. This technology is environmentally friendly with a reduction in carbon emissions of up to 1.2 tonnes of CO₂ per year per unit. The novelty of this research lies in the combination of innovative design, in-depth economic analysis, and the application of technology that is adaptive to local needs and challenges, making it relevant and beneficial to society and the environment. In conclusion, a greenhouse effect-based dryer with a ventilation chimney design is a technology that is feasible to apply to increase productivity, environmental sustainability, and the welfare of local communities.
PEMANFAATAN PENGERING EFEK RUMAH KACA DALAM MENINGKATKAN KUALITAS KERUPUK KASUBI LONUO BUKIT ARANG Pontoiyo, Fuad; Liputo, Burhan; Djamalu, Yunita
Jurnal Abdimas Terapan Vol. 4 No. 1 (2024): JURNAL ABDIMAS TERAPAN (NOVEMBER)
Publisher : Program Vokasi Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jat.v4i1.61

Abstract

Lonuo Village is located in Tilongkabila District, Bone Bolango Regency, Gorontalo. Kasubi crackers are a typical snack produced by one of the Lonuo Bukit Arang Kasubi Crackers UKMs. Kasubi crackers are made from cassava, tapioca flour, baking soda, and brown sugar, while other production requirements are cooking oil, LPG gas, gasoline, firewood, raffia rope, and plastic packaging. Meanwhile, other supporting tools in the kasubi cracker production process are plastic plates, steamer frames, steaming pans, molding tanks, sweet potato grinding machines, and para-paras as attachments for manual drying. The manual drying place used by IKM consists of 3 bamboo-based lamps measuring 7 x 13 meters for the entire cracker drying place. The drying process using bamboo sheets has many disadvantages, including drying time which takes 4 to 5 drying hours in sunny weather, unpredictable weather, less hygienic, and tends to be contaminated with bacteria because the location of the IKM is opposite the location of the Final Processing Site (TPA) for waste disposal. Bone Bolango Regency. The Kasubi Lonuo Bukit Arang cracker IKM was established in 2000 and has been continued by Santian Pillow since 2020. This IKM has more than 6 (six) permanent and non-permanent employees with daily raw material production of 1 () sack of cassava Working time from grating the coconut to drying takes 8 to 9 hours, namely from 08.00 to 15.00 WITA with the resulting cracker output being 2448 crackers per day and packaged in one hanging containing 10 crackers and priced at IDR. 11,000 per hanging. The method used in this activity is the preparation stage, implementation of activities, and program sustainability plans. The alternative drying tool that will be socialized in this activity is a greenhouse drying tool in the form of a rectangular prism with the help of energy from sunlight. While serving this community group, the service team packages activities from lecture presentations on introducing tools, questions, and answers, how to make tools, how to use tools, and how to maintain tools. From the results of this activity, it was agreed that the next activity would focus more on making cracker products using biomass stoves or stoves fueled by used oil and greenhouse effect dryers.
PEMANFAATAN MESIN PENCACAH UNTUK MEMPERCEPAT PEMOTONGAN JERAMI SEBAGAI MEDIA PERTUMBUHAN JAMUR TIRAM Djamalu, Yunita; Liputo, Burhan; Djafar, Romi
Jurnal Abdimas Terapan Vol. 2 No. 1 (2022): JURNAL ABDIMAS TERAPAN (NOVEMBER)
Publisher : Program Vokasi Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (262.436 KB) | DOI: 10.56190/jat.v2i1.17

Abstract

Tujuan dari pengabdian ini yaitu untuk mengaplikasikan hasil penelitian tentang alat pencacah jerami sebagai media pertumbuhan jamur tiram. Kegiatan pengabdian ini dilaksanakan pada bulan Agustus 2022 sebagai pengaplikasian hasil penelitian terdahulu. Pengabdian ini bertempat di Lokasi KTH Tunas Berkah Desa Jatimulya, Kecamatan Wonosari, Kabupaten Boalemo, Provinsi Gorontalo. Metode yang digunakan dalam pengabdian ini yaitu dengan metode pemaparan, pelatihan dan tanya jawab. Hasil kegiatan menunjukan bahwa penggunaan alat pencacah jerami sangat bermanfaat karena ukuran jerami yang dihasilkan dari pencacahan dapat disesuaikan dengan kebutuhan yaitu 3-5 cm. selain itu proses pencacahan menjadi lebih efisien.
SIMULATOR BOILER HYBRID SEBAGAI FUNGSI PENGERING DAN PENGOLAH LIMBAH MEDIS JENIS PLASTIK Liputo, Burhan; Djamalu, Yunita; Umela, Syaiful; Gobel, Leni; Djafar, Romi
Journal Of Renewable Energy Engineering Vol. 2 No. 1 (2024): Journal Of Renewable Energy Engineering (April)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v2i1.23

Abstract

The hybrid boiler simulator is a simulation machine designed with two working functions, namely as a medical waste processing function and as a drying cabinet function. As a medical waste processor, this machine will focus on plastic medical waste, and as a dryer function, this machine will be a clothes-drying tool or cabinet. So based on the multifunctionality of the machine, this system has hybrid working characteristics. Hybrid boiler simulators can be a solution, providing the function of processing plastic medical waste and providing the advantageous function of economical and environmentally friendly drying. Therefore, this research aims to create a hybrid boiler simulator that can be used as a plastic medical waste processing machine and also as a clothes drying machine. The hybrid boiler system is designed by applying the concept of appropriate technology so that its implementation can be done easily and practically. The research implementation method is a classification of plastic medical waste, concept design, and analysis, construction design of a hybrid boiler system combined with an incinerator for burning medical waste, system function testing, and observation of test data. The focus of his research is the heat of burning plastic waste, heat radiation, circulators, and flow control systems as well as the characteristics of the results of burning plastic waste. The results of this research are that the hybrid boiler simulator machine can function as an incinerator machine to burn plastic medical waste and function as a clothes dryer; The function of the incinerator in this machine is only through two processes, namely the process of burning plastic medical waste raw materials and the process of burning carbon gas or smoke produced from the process of burning raw materials; the sumulator machine is not yet equipped with a fogging process for the function of smoke cleaning filter and fogging control; the hybrid boiler simulator machine works on the principle of automatic control based on temperature detection using a temperature sensor; The combustion temperature in the boiler machine can be controlled at a standard of 830 °C and the drying room temperature can be set at a room temperature of 50 – 150 °C.
THERMAL MANAGEMENT AT THE ENERGY WATER ENVIRONMENT NEXUS: FROM PHOTOTHERMAL MATERIALS AND BUILDING ENVELOPES TO GRIDRESPONSIVE ENERGY SYSTEMS Djamalu, Yunita; Djafar, Romi; Fauziah, Siti; Pakaya, Roys
Journal Of Renewable Energy Engineering Vol. 3 No. 2 (2025): Journal Of Renewable Energy Engineering (Oktober)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v3i2.61

Abstract

Thermal phenomena sit at the heart of today’s most important sustainability challenges, producing clean water, maintaining healthy indoor climates, valorizing biomass, and balancing increasingly variable power grids. This review synthesizes state-of-the-art advances across materials, devices, buildings, and energy systems to outline an integrated research agenda for the energy–water–environment nexus. We highlight photothermal platforms for desalination and wastewater treatment, including macroporous three-dimensional MXene architectures with high broadband absorption and near-complete contaminant rejection, a nature-inspired “suspended” evaporator that resists salt accumulation even in 15–20 wt% brines, and scaling-mitigating slippery membranes for robust membrane distillation (Lan, Wood, & Yuen, 2019), (Zhao et al., 2019), (Islam et al., 2020). For the built environment, we analyze optimization of phase-change Trombe walls, localized solid-state humidity pumping, evidence-based thermal comfort indices, and holistic multi-objective design of net-zero energy housing in the tropics (Zhang et al., 2022; Tumuluru, Ghiasi, Soelberg, & Sokhansanj, 2021), (Luo et al., 2021; Mani et al., 2023). On the supply side, we assess rapid load transitions in solid-oxide-fuel-cell–gas-turbine hybrids, optimization-driven power-flow management, and thermal-pollution constraints on water-cooled generation (Staiger, Laschewski, & Matzarakis, 2019),(Zhu et al., 2021; Li, Hua, Tu, & Wang, 2019). Finally, we connect circular carbon strategies torrefaction and biochar to both energy quality and environmental remediation (Karanikola, Boo, Rolf, & Elimelech, 2018), (Miara et al., 2018). We conclude with cross-cutting gaps in durability, field validation, and multi-scale modeling, and propose harmonized metrics and standardized protocols to accelerate translation. All citations derive from the user-provided corpus.
Co-Authors Abdul Rahim Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Burhan Liputo Dayuwanto Harun Dimas Ishak Djafar, Romi Eska Hiola Evi Sunarti Antu Fitriyan Giu Fuad Pontoiyo Gobel, Leni Haris Abdullah Hariyanto Upingo Upingo Harlan Djabal Harun Doe Hasan Harun, Ervan Hendra Pangalima Iqrima Staddal Jamhari Jamhari Jefrin H. Antungo Jumiati Ilham Liputo, Burhan Mahmud Bahsoan Max Kurniawan Moch. Sabri Entengo Mohamad Rizki Buheli Muhammad Zahri Abdul Rahim Riklan Tahapali Rion Djafar Romi Djafar Romi Djafar Roys Pakaya Sahlan Buako Satria Wati Pade Siradjiddin Haluti Siradjuddin Haluti Siti Fauziah Sjahril Botutihe Syamsu Akuba Udjaili, Sunandar Umela, Syaiful Wahyudin van Gobel Zulkifli Ismail Zulzain Ilahude