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Riki Effendi
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SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin
Published by Universitas Muhammadiyah Jakarta
ISSN : 20889038     EISSN : 25499645     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin is an open access, peer-review journal which publishes original and review articles that advance the understanding of both the fundamentals of engineering science and its application to the solution of challenges and problems in mechanical engineering systems, machines and components. The editorial team aims to publish high quality and highly applied research and innovation that has the potential to be widely disseminated, taking into consideration the potential mechanical engineering that it could generate.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 295 Documents
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Design and Development of a Simple 2.45 GHz Microwave Plasma-in-Liquid System: Characteristics in Deionized Water and NaCl Solution Muh. Firdan Nurdin; Sudirman Sudirman; Yunas Yunas; Andi Erwin Eka Putra; Novriany Amaliyah
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

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Abstract

Plasma, the fourth state of matter, holds significant potential for industrial applications including material processing, energy conversion, and liquid waste treatment. Among the effective methods for plasma generation is the use of 2.45 GHz microwave energy. This study designed and constructed a simple microwave-based plasma-in-liquid system and evaluated the plasma characteristics formed in two liquid media: deionized water and a 5% sodium chloride (NaCl) solution. The system comprised a modified household microwave oven, an aluminum WG9A-type waveguide, and an acrylic plasma reactor fitted with tungsten electrodes. Experiments were conducted at atmospheric pressure (1 atm) with 100 mL of liquid irradiated for 60 s (n = 5 per medium). Plasma did not form in deionized water under any trial, whereas the NaCl solution consistently produced plasma exhibiting an intense orange emission. The mean final temperature was higher in the NaCl solution (78.2 ± 12.2 °C) than in deionized water (60.6 ± 14.2 °C); however, a Welch's two-sample t-test indicated this difference did not reach statistical significance at the 0.05 level (t = 2.11, p = 0.069), a result attributable to the limited sample size and to the unequal initial temperatures recorded across trials. Despite the absence of statistical significance, the qualitative outcome was unambiguous and fully reproducible: plasma ignition occurred in all five NaCl trials and in none of the five deionized-water trials, confirming that electrical conductivity of the liquid medium rather than bulk temperature alone is the governing factor for atmospheric plasma-in-liquid ignition in this system. The developed apparatus provides a low-cost, replicable platform suitable for fundamental plasma research and engineering education.
Effects of Slot Additions on the Aerodynamic Performance of NACA 4412 Airfoil at High Angles of Attack Novi Indah Riani; Didik Sugiono; Yudi Hartono; Muhamad ‘Uzair
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.220-230

Abstract

Stall is a critical phenomenon that adversely affects airfoil performance, particularly on aircraft wings, by causing a drastic reduction in lift. A lower stall angle is desirable as it allows the airfoil to maintain maximum lift over a broader range of angles of attack. One effective method for stall delay is the implementation of slots on the airfoil surface. This experimental study investigates the effects of slot additions on the aerodynamic performance of a NACA 4412 airfoil at high angles of attack. The experiments were conducted in a laboratory-scale wind tunnel at a flow velocity of 14 m/s, corresponding to a Reynolds number of 1.36 × 105. The angles of attack tested were α = 10°, 12°, 14°, 16°, and 18°. The results indicate that the maximum lift force of 5.418 N was achieved at α = 16°, while the minimum drag force of 0.0176 N was observed at α = 10°. The peak flow velocity in the wake, measured at 15.42 m/s, occurred at α = 18° at a dimensionless height of y/h = 0.90. The addition of slots effectively delayed the stall angle to 16°. This research contributes to the understanding of aerodynamic performance enhancement through flow control, offering valuable insights for the design of high-lift systems in aerospace applications.
Optimization of Turning Parameters for Cortical Ti-6Al-4V ELI Screw Production Using Taguchi Method Yulius Riansa Priyusdito; Ahmad Rosibi; Gusri Akhyar Ibrahim; Yanuar Burhanuddin
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.20.1.63-75

Abstract

Titanium alloys are widely used in biomedical applications, particularly orthopedic implants. Cortical screws with shallow threads (ISO 5835) require high precision to ensure clinical reliability. This study investigates the machining of Ti-6Al-4V ELI cortical screws using a turning process with carbide tool at cutting speeds of 1.13, 1.98, and 2.83 m/min and depths of cut of 0.1, 0.2, and 0.3 mm. Screw dimensional accuracy was evaluated in terms of height, pitch, α-angle, and β-angle errors. Data analysis employed the Taguchi L9 orthogonal array and signal-to-noise ratio with the “smaller-is-better” criterion. Results indicate that depth of cut is the most influential parameter, significantly affecting all dimensional errors. The optimal condition minimized screw deviations, though surface roughness and fractures at thread peaks were observed. These findings highlight the critical role of depth of cut in achieving ISO-compliant screw quality, with implications for improving the reliability of orthopedic implants.
Integrated Cost–Durability Assessment of Waste Glass Aggregate Concrete with ASR Mitigation for Sustainable Construction in Indonesia Endah Murtiana Sari; Probokusumo Probokusumo; Alfiya Rokhmah; Rahmat Rahmat; Muhamad Dzaky Ashidqi
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.20.1.76-91

Abstract

This study presents an integrated assessment of the economic, technical, and environmental feasibility of incorporating waste glass aggregate (WGA) as a partial replacement for natural coarse aggregate in concrete within the Indonesian construction context. A simulation-based framework using secondary data was employed, combining quantitative cost analysis with a systematic synthesis of experimental studies published between 2023 and 2025. No primary laboratory experiments were conducted. The cost analysis indicates that replacing 30% of natural coarse aggregate with WGA reduces the estimated concrete production cost from IDR 905,000/m³ to IDR 873,000/m³, corresponding to an estimated cost saving of approximately 3.5% under representative Indonesian material prices. Synthesized experimental evidence further indicates that concrete incorporating 30% WGA can maintain a 28-day compressive strength of approximately 35–40 MPa when appropriate mixture design is adopted. The incorporation of supplementary cementitious materials, including 25% fly ash and 20% ground granulated blast furnace slag (by mass of total binder), has been reported to mitigate alkali–silica reaction (ASR), reducing expansion by up to approximately 70% while improving resistance to chloride ingress. Published life-cycle assessment studies also indicate potential reductions of approximately 11% in carbon dioxide (CO₂) emissions and 15% in cumulative energy consumption relative to conventional concrete. The integrated assessment suggests that WGA concrete offers promising economic, technical, and environmental benefits and may represent a viable alternative construction material to support sustainable construction and circular economy initiatives in Indonesia.
Optimizing Tugboat Fuel Efficiency at Biringkassi Port: A PLS-SEM Structural Modelling Approach Filman Genda; Corvis L. Rantererung; Atus Buku
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

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Abstract

This study develops a diagnostic model to evaluate harbor tugboat fuel consumption efficiency at Biringkassi Port, addressing the need to reduce operating costs and greenhouse gas emissions in maritime logistics. Unlike previous studies focusing on deep-sea vessels, this research considers the unique operating characteristics of harbor tugboats. A four-construct framework comprising Ship Operations (X1), Engine and Equipment Performance (X2), Environmental Factors (X3), and Operator Behavior (X4) was evaluated using Partial Least Squares Structural Equation Modeling (PLS-SEM). Data from 50 maritime experts and validated operational records were analyzed using SmartPLS 4.0. The results identify Ship Operations as the dominant determinant of fuel consumption efficiency (β = 0.729, p < 0.001), followed by Environmental Factors (β = 0.099), Engine and Equipment Performance (β = 0.087), and Operator Behavior (β = 0.062). The proposed model explains 71.8% of the variance in fuel consumption efficiency (R² = 0.718) and demonstrates strong predictive relevance (Q² = 0.491). The findings indicate that optimizing voyage scheduling and standardizing speed-to-distance ratios can significantly improve fuel efficiency while reducing operating costs and carbon emissions. The proposed framework provides a practical diagnostic tool for port authorities and a scalable basis for future multi-port validation.

Page 30 of 30 | Total Record : 295

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