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All Journal Teknologi dan Kejuruan: Jurnal teknologi, Kejuruan dan Pengajarannya International Journal of Integrative Sciences
Gunawan Refiadi, Gunawan
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Industrial & Manufacturing Engineering Social Sciences

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Problem Based Learning: Suatu Upaya Meningkatkan Prestasi Belajar Las SMAW Siswa SMK Khoerudin, Apip; Refiadi, Gunawan
Teknologi dan Kejuruan: Jurnal Teknologi, Kejuruan, dan Pengajarannya Vol 43, No 1: Februari 2020
Publisher : Fakultas Teknik Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um031v43i12020p28-34

Abstract

Optimization of SMAW learning is necessary for vocational school students to achieve optimal competence. Problem-Based Learning (PBL) was reported in increasing skill learning outcomes. However, a specific PBL treatment in SMAW subjects has not yet published. This research contributed to how to give the SMAW learning method through the PBL model. This research adopted the conventional model as a control of the PBL experiment model. This research applied quasi-experiment with a population of the X-th grade of the VHS students. The samples were X-Mechanical and X-Automotive class, respectively. To amplify the success of the PBL model, the research visually analyzed the students' weldment results based on the surface quality appearance. PBL model increased the study outcome capabilities of the SMAW method up to 17.5 percent (from 75.9 percent to 93.4 percent). This increment was 30.6 percent higher than the conventional method. Statistical evident showed that the PBL index gain on the t-test (a equals 5 percent) was better and followed by a better physical fact in weld surface quality at the weldment area than the conventional one
Effect of Fiber Length and Alkalization Treatment on the Tensile Properties of Musa Paradisia Banan Stick Fiber Composite Gundara, Gugun; Refiadi, Gunawan; Lugiana, Yuda
International Journal of Integrative Sciences Vol. 3 No. 7 (2024): July 2024
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/ijis.v3i7.10520

Abstract

Composite materials are widely used and in demand in various applications, because they have advantages such as being light and relatively strong. The basic material used in this composite uses natural fiber because the fiber is environmentally friendly and is available in abundance in nature, making it more economical. The matrix as a binder uses epoxy. This research was conducted to determine the comparison of tensile strength of composites due to the influence of alkalisation and non-alkalization with a concentration of 5% NaOH for 2 hours with fiber lengths of 5 cm and 7 cm. The composite specimens made refer to the ASTM-D638 standard. The research method used four stages, namely taking kepok banana tree frond fibers, making composites, tensile testing and SEM testing. The highest tensile test results occurred in composites with alkalization treatment with a fiber length variation of 5 cm, namely 39.54 MPa. Meanwhile, the highest value for the composite without alkalization treatment occurred at a fiber length of 5 cm, namely 39.19 MPa. The highest elastic modulus value occurred in the composite with a 7 cm fiber variation of 4.76 GPa with alkalization treatment
Co-Authors Gugun Gundara, Gugun Iis Siti Aisyah Khoerudin, Apip Lugiana, Yuda Siregar, Januar Parlaungan