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All Journal Jurnal Rekayasa Mesin Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan
Laksono, Galih Tri
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Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science Immunology & microbiology Mathematics Mechanical Engineering Physics Social Sciences

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Penerapan Model Pembelajaran Jigsaw Berbasis Project Based Learning dalam Meningkatkan Keterampilan dan Hasil Belajar Siswa SMK Prasojo, Krisna Tri; Huda, Khoirul; Kriswanto, Kriswanto; Kristiawan, Ruben Bayu; Laksono, Galih Tri
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 5 No. 3 (2025): July
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v5i3.428

Abstract

This study aims to implement and test the effectiveness of the jigsaw learning model based on project based learning in improving students' skills and learning outcomes in the subject of lathe machining at SMK Negeri 5 Sukoharjo. The method used is a quasi-experimental design with a two-group pre-test post-test design, involving 68 students divided into an experimental group and a control group. Data collection was carried out through pre-test and post-test, observation, and documentation. The results of the analysis showed a significant increase in the experimental group's learning outcome score with an average post-test score of 79.85 or an increase of 34.07% compared to the average pre-test score of 59.56. In contrast, the control group only experienced an increase of 28.3%, from an average of 55.44 to 71.18. The t-test showed a significant difference between the experimental group and the control group (p <0.05). N-Gain analysis also showed high effectiveness in the experimental group (0.5166) compared to the moderate category in the control group (0.3503). In addition, the observation results showed an increase in motivation, active participation, and student cooperation during the learning process. Thus, the combination of the jigsaw model with project-based learning has proven effective in improving student learning outcomes and skills significantly compared to conventional learning methods. This study contributes to the development of contextual and collaborative vocational learning strategies to face the demands of the industrial world.
Optimization Design of NACA 4412 Airfoil Based on Genetic Algorithm for Efficiency and Maximum Lift Force Laksono, Aryo Eko; Bahatmaka, Aldias; Fitriyana, Deni Fajar; Laksono, Galih Tri; Habibullah, Muhammad; Nubli, Haris; Hyung, Cho Joung
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6531

Abstract

The NACA 4412 airfoil, renowned for its exceptional subsonic aerodynamic performance, faces critical operational constraints including elevated drag characteristics and premature stall onset at high angles of attack. While previous investigations have independently examined internal slot modifications and gurney flap implementations for aerodynamic enhancement, the synergistic potential of their combined application to the NACA 4412 configuration remains largely unexplored. This research presents a comprehensive optimization study that strategically integrates internal slot geometry with gurney flap configuration to maximize lift coefficient (CL) and aerodynamic efficiency (CL/CD) through advanced genetic algorithm optimization. The methodology employed high-fidelity computational fluid dynamics simulations using FLUENT with Spalart-Allmaras turbulence modeling, validated against experimental data to ensure accuracy. PCHIP numerical interpolation techniques were utilized to estimate aerodynamic coefficients across comprehensive angle-of-attack ranges not directly simulated. The optimized configuration demonstrated remarkable performance improvements, including a 75.68% increase in lift coefficient, an extension of the critical stall angle from 14° to 16°, enhanced aerodynamic efficiency, and significantly improved flow stability with reduced separation characteristics. These findings establish that the synergistic combination of internal slot and gurney flap modifications can fundamentally transform NACA 4412 aerodynamic performance, particularly excelling in high-angle-of-attack operational scenarios.
Co-Authors Aldias Bahatmaka Fitriyana, Deni Fajar Hyung, Cho Joung Khoirul Huda Kristiawan, Ruben Bayu Kriswanto Kriswanto, Kriswanto Laksono, Aryo Eko Muhammad Habibullah Nubli, Haris Prasojo, Krisna Tri