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Juliandi Siregar

Universitas Muslim Nusantara Al Washliyah

Author-ID : 1832067

Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Health Professions Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Analisis Simulasi Hubungan Suhu Sintering Dengan Nilai Kekerasan Dan Kekuatan Patah Keramik Alumina Siregar, Juliandi; Seragih, Marnanda; Lubis, Sahara
JURNAL EDUSCIENCE (JES) Vol 7, No 1 (2020): Jurnal Eduscience (JES)
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jes.v7i1.1676

This research uses variable sintering temperature of 1300 0C, 1400 0C, 1500 0C and 1600 0C mixed with mullite additives 0%, 10%, 15%, 20% and 25%. As parameters of the study are the vickers hardness and bending strength. In this study a computational simulation has been designed with the Matlab program to analyze the relationship between the Vickers Hardness and bending strength to the sintering temperature of alumina ceramics (Al2O3) with variations in the addition of mullite additives.The best result of the hardness value which is close to the literature value is the 25 % mullite additive composition at a sintering temperature of 1600 0C which is 475 kgf / mm2. The best results of fracture strength values close to the literature value is the composition of the mullite additive 20% at a sintering temperature of 1600 0C which is 45,800 lbf / in2. From the results of simulation analysis for hardness and strength of the fractures can be obtained a constant change due to the constant increase in sintering temperature.Keywords: Matlab, Vickers Hardness and Bending Strength, Alumina Ceramics, Mullit.

Analisis Simulasi Hubungan Suhu Sintering Dengan Nilai Kekerasan Dan Kekuatan Patah Keramik Alumina Marnanda Seragih; Sahara Lubis; Juliandi Siregar
JURNAL EDUSCIENCE (JES) Vol 7, No 1 (2020): Jurnal Eduscience (JES)
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jes.v7i1.1676

This research uses variable sintering temperature of 1300 0C, 1400 0C, 1500 0C and 1600 0C mixed with mullite additives 0%, 10%, 15%, 20% and 25%. As parameters of the study are the vickers hardness and bending strength. In this study a computational simulation has been designed with the Matlab program to analyze the relationship between the Vickers Hardness and bending strength to the sintering temperature of alumina ceramics (Al2O3) with variations in the addition of mullite additives.The best result of the hardness value which is close to the literature value is the 25 % mullite additive composition at a sintering temperature of 1600 0C which is 475 kgf / mm2. The best results of fracture strength values close to the literature value is the composition of the mullite additive 20% at a sintering temperature of 1600 0C which is 45,800 lbf / in2. From the results of simulation analysis for hardness and strength of the fractures can be obtained a constant change due to the constant increase in sintering temperature.Keywords: Matlab, Vickers Hardness and Bending Strength, Alumina Ceramics, Mullit.

EXPLORATION OF THE USE OF PHET SIMULATION ON NEWTON'S LAW MATERIALS TO IMPROVE STUDENT PHYSICS LEARNING OUTCOMES Siregar, Juliandi; Mawaddah, Hajar; Khairiah, Khairiah; Berliani, Halimah; Nasution, Lia Afriyanti; Putri, Nur Amelia; Derlina, Derlina; Pramudito, Rafaza; Ehkan, Phaklen
JURNAL EDUSCIENCE Vol 11, No 3 (2024): Jurnal Eduscience (JES), (Authors from Hungary, South Africa, Malaysia, and Ind
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jes.v11i3.6590

AbstractThe background to this research is that physics lessons are often considered difficult and less interesting by students, especially because of their abstract nature, the complexity of mathematical calculations, and the difficulty in connecting theory with practice. One of the challenging topics is Newton's Law of motion, which includes the relationship between force, mass and acceleration. This research was carried out at MA Muallimin UNIVA Medan, by applying the Problem Based Learning (PBL) learning model, an innovative learning media that is relevant to development. technology. This research utilizes PHET (Physics Education Technology), an interactive simulation platform developed by the University of Colorado Boulder, to support learning Newton's Laws. PHET allows students to carry out virtual experiments independently with various variables, such as mass, force and surface type, so that student learning outcomes increase. The research method used is quantitative in class X-G. The instrument used is a written test (essay) with a total of 10 questions. It is known that the pretest and posttest data are normally distributed with a significance value of Pretest (0), Posttest (0,), and are declared homogeneous with a significance value Based on Mean (0.245) where the normality and homogeneity test values exceed (>) the real level used in the measurement namely α = 0.05 or 5%. With the help of SPSS, it is known that the average posttest student learning outcomes (85.93) are higher than the pretest (58.80), so it can be concluded that the hypothesis is accepted.

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