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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Waspada : Jurnal Wawasan Pengembangan Pendidikan
Anwar, M Syaiful
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Education Engineering Languange, Linguistic, Communication & Media

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Evaluation of microstructure high chrome austenitic stainless-steel grade 253MA after creep test at temperature of 700°C Alviana, Rifda Muthia; Anwar, M Syaiful; Siradj, Eddy S
Jurnal Pendidikan Teknologi Kejuruan Vol 6 No 1 (2023): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jptk.v6i1.31523

Abstract

High Chrome Austenitic Stainless-Steel grade 253 MA is a material that widely used for high temperature. This is due the fact this material has excellent mechanical properties and creep resistance. However, changes in microstructure can occur in long-term use, which will affect the creep resistance (shortened service life of the material). The microstructure of High Chrome Austenitic Stainless-Steel 253 MA creep test specimens was investigated. Creep testing at a temperature of 700 °C with a loading of 150 MPa was carried out. The cold rolling process with 53% reduction in thickness was applied followed by annealing at 900°C, 1000°C, and 1100°C for 3600s to obtain different grain size. Grain size after annealing and after creep test was measured to see the effect of annealing temperature on the grain size of tested steel and to see its effect on creep resistance based on the creep test conducted. Grain size and morphology of the phase after creep test were observed by scanning electron microscope and optical microscope
Penerapan Model Problem Based Learning Berbantuan Media Mobile Learning Untuk Meningkatkan Keterampilan Berpikir Kritis Siswa Muhammad, Muhammad; Aji, Waskito; Anwar, M Syaiful
WASPADA (Jurnal Wawasan Pengembangan Pendidikan) Vol 13, No 1 (2025): WASPADA
Publisher : Faculty of Teacher Training and Education of Undaris

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61689/waspada.v13i1.728

Abstract

This research aims to improve critical thinking skills of elementary school students using Problem Based Learning model assisted by Mobile Learning media. The type of research used is quasi-experimental with a nonequivalent control group design. The population of this research were V grade students on Ungaran Barat in the 2024/2025 academic year. Sample of this research was V grade students of SDI Istiqomah. The sampling technique used in this study was Purposive Sampling. The data collection technique in this study used a test technique in the form of multiple choice and descriptive questions, as well as a non-test technique using observation and documentation. Data were analyzed using the gain score test and t-test. The results showed that there was a significant increase in students' critical thinking skills using the PBL model assisted by mobile learning media. There was a significant difference in the average score of critical thinking skills between the experimental class and the control class with a significance level of 5% with an N-Gain of the experimental class of 0.72 and the control class of 0.43. The results of the independent test stated that there was a difference between the experimental class and the control class, indicated by the t-value of 0.472 with a significance level of 0.000. This shows that the PBL model assisted by mobile learning media can improve students' critical thinking skills.Keywords: Problem Based Learning, Mobile Learning, Critical Thinking Skills
Co-Authors Aji, Waskito Alviana, Rifda Muthia Eddy S Siradj Muhammad Muhammad