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All Journal Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vocatech : Vocational Education and Technology Journal Jurnal VORTEKS Jurnal Derma Pengabdian Dosen Perguruan Tinggi (Jurnal DEPUTI) Journal of Innovation Research and Knowledge Jurnal Pengabdian Mandiri Jurnal Teknik Mesin Sinergi
Refiza, Refiza
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The Effect of fuel mixture composition on gasoline engine emissions in urban conditions Siregar, Zufri Hasrudy; Nasution, Arif Fadillah; Fazri, Muhammad; Refiza, Refiza; Puspita, Riana; Thamrin, Husni; Nasution, Asmara Sari
Jurnal VORTEKS Vol. 5 No. 2 (2024): October 2024
Publisher : Program Studi Teknik mesin, Fakultas Teknik, Universitas Al Azhar Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54123/vorteks.v5i2.389

Abstract

The increasing number of motorized vehicles in urban areas significantly impacts air quality and public health. Gasoline engine emissions, including CO, HC, and NOx, contribute to pollution issues such as volatile organic compounds (VOCs) and secondary organic aerosols (SOAs). Understanding these factors is crucial for developing effective emission control strategies. This study investigates the effect of ethanol-blended gasoline on vehicular emissions, focusing on CO, HC, and NOx. The research aims to optimize fuel mixtures to reduce harmful emissions while considering environmental and health impacts. The study uses a quantitative experimental design, combining laboratory tests with field trials on 10 vehicles under controlled conditions. Results show that ethanol-blended fuels significantly reduced CO emissions, from 2.4 g/km (E0) to 1.5 g/km (E30). A moderate reduction was observed in HC emissions, from 0.55 g/km (E0) to 0.40 g/km (E30). A slight decrease in NOx emissions was noted. Ethanol's oxygen content improves combustion efficiency, reducing CO and HC emissions, but may slightly increase NOx due to combustion temperature changes. This study highlights the potential of ethanol as an environmentally friendly fuel alternative, with further research needed to address NOx-related challenges
Rancang mesin peraut lidi kelapa sawit dengan menggunakan motor listrik kapasitas 1800 lidi/jam Siregar, Zufri Hasrudy; Ramadhan, Andri; Syafputra, Nanda; Mawardi, Mawardi; Refiza, Refiza
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 10, No 2 (2024): Oktober
Publisher : universitas teuku umar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35308/jmkn.v10i2.10595

Abstract

The palm oil industry is a vital sector in Indonesia, yet it still faces challenges in optimizing waste management, particularly with palm leaf midribs, which are commonly used in various industries. This research aims to design an efficient and economical palm leaf midrib shaving machine with a capacity of 1800 midribs per hour. The novelty of this research lies in the development of a specialized machine for palm leaf midribs, a topic that has not been extensively studied. The research methodology employed is engineering design, involving needs analysis, conceptual design, and implementation using a 0.5 HP electric motor. The materials and tools used include mild steel, stainless steel 304, wood, and other manufacturing components designed for durability and efficiency. The results show that the machine is effective in shaving midribs with a shaft force of 1.91 N and a power output of 0.425 kW, meeting the specified design requirements. In conclusion, this machine can enhance the efficiency of midrib production processes and contribute to more sustainable waste management in the palm oil industry..
PROSES PEMANENAN HASIL TANAMAN UNTUK KECUKUPAN PANGAN MAHASANTRI PENGHAPAL AL QURAN DI YAYASAN LAYAR DAKWAH Masdania Zurairah; Muhammad Fiza Lubis; Muhammad Fazri Pasaribu; Refiza, Refiza; Refiza4, Edi Syahputra Saragih
JURNAL PENGABDIAN MANDIRI Vol. 4 No. 7: Juli 2025
Publisher : Bajang Institute

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Abstract

The harvesting process for each plant is different according to the time. The harvesting process to achieve maximum results is carried out by maintenance, fertilization and watering. The harvesting process for chilies, tomatoes, eggplants, pumpkins, long beans, peanuts and cassava. Harvesting is done by pulling out such as peanuts, by pulling out plants with loose soil, the pulling process is very easy to do, so that it will produce peanuts in the soil. Likewise, cassava harvesting is done by pulling out or pulling the tree trunk until the cassava fruit is also pulled. Chilies, tomatoes, eggplants, long beans and pumpkins are harvested by picking them. The fastest harvest time is tomatoes 60 days. The longest time to harvest is cassava up to 240 days. With this post-harvest, it can meet the needs of students in food
ANALISA PRODUKTIVITAS PRODUKSI OLEIC ACID MENGGUNAKAN METODE OBJECTIVE MATRIX (OMAX) DI PT. PERMATA HIJAU GROUP Iqbal Habibi; Refiza, Refiza; Rizkha Rida; Sanco Simanullang
Journal of Innovation Research and Knowledge Vol. 5 No. 3: Agustus 2025
Publisher : Bajang Institute

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Abstract

PT. Permata Hijau Group is a company that continues to develop both upstream and downstream, especially at the product sales level. Oleic acid is one of the expensive products sold among oleochemical processing companies. In producing oleic acid, several large costs were found due to lengthy repairs and the plantation not operating. So methods are needed to increase productivity. Analysis using the objective matrix (OMAX) method is a method that is widely used in analyzing the productivity of a company. The method used is the use of OMAX, including determining criteria, determining performance, determining average productivity values, determining the highest and lowest productivity values, determining realistic productivity values, determining scores and value weights, determining productivity indices and making cause-cause diagrams. consequence (fishbone). The results obtained from applying the objective matrix (OMAX) method include the first being the highest productivity index value in October 2023 of 66.66% and the lowest in September of -64.93%. The second result is that the factors that have the most influence on oleic acid productivity. And the third result is that 6 proposed actions are needed to increase oleic acid productivity
Co-Authors Acim Maulana Ali Imran Asmara Sari Nasution Damanik, Rahmat Indrajaya Edy Syahputra Saragih Fazri, Muhammad Husaini, Muhammad Alwi Husni Thamrin Ikhwan, Rosendra Iqbal Habibi Jayawarsa, A.A. Ketut Masdania Zurairah Muhammad Fazri Pasaribu Muhammad Fiza Lubis Muhammad Irwansyah, Muhammad Nasution, Arif Fadillah Prinsi Rigitta Rahmad Rezeki Ramadhan, Andri Rambe, Fajar Noer Refiza4, Edi Syahputra Saragih Riana Puspita, Riana Rizkha Rida Safitri, Indriani Saktisahdan, T. Jukdin Silaban, Donni Simanullang, Irwan Prasetya Simanullang, Sanco Simorangkir, Simon Petrus Siregar, Masdania Zurairah Siregar, Roswani Siregar, Zufri Hasrudy Soaloon, Humala Raja Syafira, Nadira Syafputra, Nanda Syuhada, Ferry Trisilo, Muji Zurairah, Masdania