cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Arip Mulyanto
Contact Email
arip.mulyanto@ung.ac.id
Phone
+6285240850881
Journal Mail Official
jurnal.teknik@ung.ac.id
Editorial Address
Jl. Jenderal Sudirman No.6 Kota Gorontalo
Location
Kota gorontalo,
Gorontalo
INDONESIA
Jurnal Teknik
Published by Universitas Negeri Gorontalo
ISSN : 16936191     EISSN : 27157660     DOI : https://doi.org/10.37031/jt
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Teknik (JT) is a peer-reviewed journal published by Faculty of Engineering, State University of Gorontalo. JT is published two times annually, in June and December. JT provides a place for academics, researchers, and practitioners to publish scientific articles. The scope of the articles listed in this journal is related to various topics such as Civil Engineering, Electrical Engineering, Informatics Engineering, Craft Engineering, Architecture, Industrial Engineering, Mechanical Engineering, Engineering Education, and other related engineering fields.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 142 Documents
 11   12   13   14   15 
Physicochemical Characterization and Epoxidation of Jatropha Curcas Oil for Eco-Friendly Engine Lubricant Applications Putra, Agus Dwi; pradani, Yayi Febdia; Dewi Izzatus Tsamroh; Zakaria, Yahya; Mahfudi Sahli Subandi
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.651

Abstract

This study aims to explore the potential of castor oil (Jatropha curcas L.) as a plant-based alternative engine lubricant and compare it to commercial mineral-based lubricants. The research process includes drying Jatropha seeds and epoxidizing the oil using oxidizing agents (H₂O₂) and (CH₃COOH) with variations of (1:0.075; 1:0.15; 1:0.225; and 1:0.30). Chemical testing was conducted to analyze the acid number of the oil, while physical testing was carried out to measure its viscosity index, flash point, and pour point. The results show that Jatropha oil has an acid number of 5.30, a viscosity index of 217, a flash point of 270°C, and a pour point of 0°C. Therefore, Jatropha oil demonstrates potential as a base material for engine lubricants due to its relatively high flash point, which approaches that of polyol ester (POE)-based oils. However, further modification with additives is required to lower its pour point, ensuring it remains fluid in colder climates such as those in subtropical regions.
Evaluasi Sistem Pelaporan Kekerasan Seksual di Perguruan Tinggi: Pendekatan Black-Box dan Kepatuhan terhadap Permendikbudristek No. 30/2021 Nursetia Wati; Mohidin, Ismail; Hermawanto, Fajar; Suleman, Salman
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.655

Abstract

The sexual violence reporting system is a critical component in creating a safe and responsive campus environment for victims. This study aims to evaluate a web-based sexual violence reporting system implemented at a higher education institution by integrating Black-Box Testing and Compliance Testing approaches. The evaluation assesses both the system’s functional performance from a user perspective and its adherence to relevant regulations, particularly Permendikbudristek No. 30 of 2021. The results of Black-Box Testing indicate that most features function properly, although some issues were found in error messaging and the usability of anonymous reporting options. Meanwhile, Compliance Testing shows that the system fulfills most regulatory indicators, but there are still weaknesses in access control to victim data by internal staff. These findings highlight the importance of comprehensive evaluation in systems dealing with sensitive issues to ensure both technical reliability and compliance with principles of justice and victim protection.
Pemanfaatan Limbah Oli Bekas Sebagai Bahan Bakar Alternatif Untuk Kompor Bertekanan Udara Umami, Mahrus Khoirul; Irawan, Ibnu; Alim, Wildan; Arifin, Zainal
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.671

Abstract

As the number of vehicles increases, the amount of used oil waste also increases. Used oil waste can be used as an alternative fuel energy for stoves. In the combustion process of used oil, the mixture of air and fuel can affect the achievement of optimal temperature by applying the right AFR (Air Fuel Ratio). The chemical formula of used oil can be known using the GC-MS (Gas Chromatography-Mass Spectrometry) test. The purpose of this study is to calculate the stoichiometric AFR, determine the resulting combustion temperature, then the combustion time at each variation of air mass rate of 0.00193 kg/s, 0.00276 kg/s, 0.00359 kg/s, 0.00442 kg/s and 0.00525 kg/s. The results of the GC-MS test of used oil obtained the chemical formula C22H46, so the stoichiometric AFR is 14.8:1. Stoichiometric combustion occurs at an air mass rate of 0.00359 kg/s producing a flame temperature of 876.8°C and a furnace temperature of 535.2°C, with a combustion duration of 1627 seconds, producing a blue flame across the furnace surface as an indicator of low emission values ​​and no soot. The combustion value with the highest temperature occurs at an air mass rate of 0.00525 kg/s, namely 1124°C, on the flame and 694.6°C on the furnace with a combustion duration of 1229 seconds. The lowest temperature occurs at a mass rate of 0.00193 kg/s, namely 767.5°C on the flame and 290.8°C on the furnace with a combustion duration of 2224 seconds. This study can be concluded that the greater the air mass rate, the higher the combustion temperature value so that the combustion is faster. This used oil stove can be an alternative new technology, which can replace people's dependence on gas stoves and become a solution for environmentally friendly stoves that do not emit soot in their combustion.
Pemanfaatan Assemblr Edu dalam Pembelajaran Simulasi Komputer: Pengaruhnya terhadap Minat Belajar Siswa Muthia, Muthia; Pobela, Elvira Ningsih; Latief, Mukhlisulfatih; Novian, Dian; Dwinanto, Arif; Mas'ud, Huzaima
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.680

Abstract

In the educational process, there are various factors that influence the success of the learning process, one of which is student interest in learning. However, in practice, there are still a number of problems related to low student interest in learning. One of the causes is the lack of interesting learning media and abstract learning materials, which cause students to lose interest and feel bored in learning. This situation has an impact on low student interest in learning. This study aims to examine the effect of Assemblr Edu-based learning media on students' interest in learning, particularly in Von Neumann computer simulation material. The media validation results showed a percentage of 88%, indicating that Assemblr Edu-based learning media is suitable for use. Additionally, the hypothesis test using the independent samples t-test method yielded a Sig value of 0.009 < 0.05, where the result is smaller than Sig 0.05, meaning there is an effect on students' interest in learning. This finding indicates that Assemblr Edu-based learning media influences students' interest in learning.
Eksperimental Beton Ringan Struktural dengan Inovasi Serat Polypropylene sebagai Pengendali Retak Purnawirati, I.G.A.; Herlambang, Fajar Surya
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.683

Abstract

This study aims to evaluate the effect of polypropylene fiber addition on the mechanical properties and crack behavior of structural lightweight concrete using local aggregates from Bali. The research was conducted experimentally by preparing cylindrical specimens (Ø150 × 300 mm) and beam specimens (200 × 200 × 2000 mm). Polypropylene fiber was added at 0% and 0.6% by volume of concrete, with superplasticizer SIKA ViscoCrete-3115 N included to maintain workability. The results show that the addition of polypropylene fibers had no significant effect on the concrete density, which remained below 1900 kg/m³, meeting the structural lightweight concrete criteria of ACI 213R-14. The compressive strength of the fiber-reinforced concrete decreased slightly by about 11.4% compared to the control mix, while the splitting tensile strength increased by 7.5% and the flexural strength increased by 9.9%. The maximum crack width decreased from 0.85 mm to 0.55 mm, indicating that the fibers effectively controlled crack propagation and improved ductility. Overall, the incorporation of 0.6% polypropylene fibers enhanced the crack resistance and toughness of structural lightweight concrete without compromising its low density, making it a promising material for lightweight structural elements in multi-story and prestressed concrete applications.
Studi Komparatif Rencana Anggaran Biaya Klinik PT. Delta Subur Permai Berdasarkan SNI Basiri, Syamsu; Ibrahim, Malik; Lutfie, Mukhtar
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.685

Abstract

PT. Delta Subur Permai (DSP) is a subsidiary of Kencana Agri Group operating in Batui District, Banggai Regency, Central Sulawesi. This company is engaged in oil palm cultivation; however, since its establishment, it has lacked adequate health facilities, resulting in suboptimal employee health services. For this reason, the company took the initiative to build a clinic that supports the health needs of its workers. In the planning process, the budget plan data used by the contractor still refers to the contractor's internal calculation method. Therefore, this study focuses on analyzing the Cost Budget Plan (RAB) for clinic construction using the SNI analysis method. The objectives of this study are determine the RAB for PT DSP's clinic construction based on unit prices from the Banggai Regency Government with SNI analysis and to compare more efficient methods in preparing the RAB. The study employed a comparative quantitative method, specifically comparing variable values across different populations or samples. The results showed that the RAB value using the SNI method was Rp. Rp. 313,300,820, which is higher than the contractor's method of Rp. 297,186,771. This confirms the difference in calculation results between the two methods.
Comparative Analysis of Columns Ratio on Structural Performance and Cost Efficiency Wibowo, Kevin Aprilio; Widjajakusuma, Jack
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.686

Abstract

Planning is crucial in construction as it can significantly reduce costs by aligning structural design with requirements while minimizing excess. This study evaluates the structural performance of columns with different shapes and dimensions, utilizing data from the construction site and Indonesian National Standards (SNI). The analysis reveals that square-shaped columns, with a cross-section ratio close to 1, require less material than rectangular columns, with a 17.35% lower concrete volume and a 23.37% smaller formwork area. However, the reinforcement needed for square columns is 6.38% higher. Overall, square columns lead to a 15.42% reduction in production costs. This also results in lower cement consumption, contributing to decreased CO₂ emissions—Design B using 856.32 kg (18.52%) less cement than Design A. The results support the principles of the Sustainable Development Goals (SDGs), particularly SDG 9 (Industry, Innovation, and Infrastructure), SDG 11 (Sustainable Cities and Communities), SDG 12 (Responsible Consumption and Production), and SDG 13 (Climate Action). These findings align with the Sustainable Development Goals (SDGs), emphasizing the importance of sustainability alongside cost efficiency in structural planning.
Pengaruh Cutting Speed dan Laser Power Proses Fiber Laser Cutting Terhadap Kekasaran Permukaan Pada Baja AISI 1040 Dengan Ketebalan 6mm Rahmadianto, Febi; Pohan, Gerald A.; Yanuar, Kenzha
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.710

Abstract

Surface roughness is a measure of microscopic irregularities on a material's surface that affects the performance, service life, and aesthetics of a product. This study analyzes the effect of cutting speed and Laser Power in the fiber Laser Cutting process on the surface roughness of 6 mm thick AISI 1040 steel. The method used was true experimental research with variations in cutting speed (500, 1000, 1500 mm/min) and Laser Power (80%, 90%, 100%). The results show that the combination of 1000 mm/min cutting speed and 80% Laser Power produced the lowest roughness of 2.3 µm, while the combination of 500 mm/min and 90% produced the highest roughness of 29.36 µm. Increasing Laser Power generally increases roughness, except at 100% Laser Power with 500 mm/min cutting speed which decreased due to more uniform material melting. The conclusion of this study is that optimal parameters (cutting speed 1000 mm/min and Laser Power 80%) produce a smooth surface. These findings can be a reference for the manufacturing industry in improving product quality through Laser Cutting process optimization.
Implementasi FMEA dan Perbaikan Tata Letak untuk Meningkatkan Produktivitas pada Departemen Dempul Painting di PT XYZ Ayuningtyas, Virna Rahmadani; Arsiwi, Pramudi
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.711

Abstract

PT XYZ, a bus body manufacturing company, faces a high defect rate in the Putty and Painting Department, recording a total of 3,697 defects from January to October 2023, with the peak occurring in April at 521 cases (14.1%). The dominant defects include discoloration, overspray, waviness, and damage to the clear coat and putty, indicating a systemic issue. This study aims to identify major defects and determine improvement priorities using the Operation Process Chart, 8 Waste questionnaire, and Failure Mode and Effect Analysis (FMEA) based on the Risk Priority Number (RPN). Results show that the basecoat process has the highest RPN value of 80, while the baggage paint process has the lowest at 12. The main causes include overproduction, long workstation distances, excessive waiting time, unstable raw materials, lack of operator training, and weak inspection systems. Recommended improvements include SOP standardization, layout optimization, regular training, temperature and lighting control, and strengthening quality control to enhance product quality and production efficiency.
Implementasi Smart Apps Creator dalam Pengembangan Media Pembelajaran Informatika Berbasis Android Sri Ayu Ashari; Sitti Suhada; Ramanda Dwi Putra; Mulyanto, Arip; Dwinanto, Arif; Muthia, Muthia
Jurnal Teknik Vol 23 No 2 (2025): Jurnal Teknik
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37031/jt.v23i2.716

Abstract

Informatics subjects at SMK Negeri 1 Paguyaman still largely use conventional learning media, such as printed books, worksheets, and PowerPoint slides, which cannot provide an interactive and engaging learning experience. This condition has an impact on low student interest, participation, and understanding of the material. Therefore, this study was conducted with the aim of implementing a smart app creator in designing and developing Android-based interactive learning media as a more effective, engaging, and easily accessible learning solution. This study used the Research and Development (R&D) method with a 4D development model that includes the Define, Design, Develop, and Disseminate stages. The developed media is equipped with interactive features such as visual materials, quizzes, and educational games tailored to the characteristics of vocational school students. The validation results showed that the media obtained an average score of 138 from material experts, 106.5 from media experts, and 101 from student assessments, all of which are included in the "Very Feasible" category. Based on these results, the developed learning media is declared feasible for use to improve the quality of Informatics learning. In addition, this media is also able to provide a more active, interactive, and interesting learning experience for students.

Page 14 of 15 | Total Record : 142

 11   12   13   14   15 

Filter by Year

2018 2025


Reset
Filter By Issues
All Issue Vol 23 No 2 (2025): Jurnal Teknik Vol 23 No 1 (2025): Jurnal Teknik Vol 22 No 2 (2024): Jurnal Teknik Vol 22 No 1 (2024): Jurnal Teknik Vol 21 No 2 (2023): Jurnal Teknik Vol 21 No 1 (2023): Jurnal Teknik Vol 20 No 2 (2022): Jurnal Teknik Vol 20 No 1 (2022): Jurnal Teknik Vol 19 No 2 (2021): Jurnal Teknik Vol 19 No 1 (2021): Jurnal Teknik Vol 18 No 2 (2020): Jurnal Teknik Vol 18 No 1 (2020): Jurnal Teknik Vol 17 No 2 (2019): Jurnal Teknik Vol 17 No 1 (2019): Jurnal Teknik Vol 16 No 2 (2018): Jurnal Teknik Vol 16 No 1 (2018): Jurnal Teknik More Issue