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All Journal JURNAL PENDIDIKAN TAMBUSAI Jurnal Vokasi Mekanika Jurnal Pendidik Indonesia
Marisa, Susi
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Chemistry Education Mathematics Mechanical Engineering Physics Social Sciences

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Analysis Of Physical And Mechanical Properties Of Recycled Aluminum With Variations In Molding Temperatures And Adding Degasser Powder As An Environmentally Friendly Material Abadi, Zainal; Kurniawan, Andre; Arafat, Andril; Marisa, Susi
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 2 (2025): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i1.833

Abstract

Recycling is the process of converting used materials into new materials with the aim of preventing waste that can actually be useful, reducing the use of new raw materials, reducing energy use, reducing pollution, land damage. The purpose of this study was to determine the most optimal pouring temperature to produce the best casting of the physical and mechanical properties of recycled aluminum material added with degasser powder. The urgency of this study is as a research material in the field of materials. This research method is to make 3 variations of melting temperature before pouring into the mold, the temperature variations used are 6750-7000C, 7000-7250C and 7250-7500C. At any temperature variation before pouring into the mold, degasser powder is also added to help clean the molten metal from the gases trapped in the molten metal. After the sample is molded, the results are visually observed, then a specimen is made to test the mechanical properties of the used aluminum casting. The data from the test results show that there is a fairly large porosity value in each variation. The hardness value of the test results shows that it is directly proportional to the temperature variation. At a temperature of 7250-7500C the average hardness value is 98.5 HVN. While the tensile strength at a temperature of 7250-7500C value is 83.58 Mpa, at a temperature of 7000-7250C = 74.39 Mpa and at a temperature of 6750-7000C = 71.5 Mpa. Thus the most optimal temperature in this used aluminum casting is 7250-7500C.
Model Motivasi Belajar dengan Structural Equation Modeling Marisa, Susi; Dwi Bulan, Defina
Jurnal Pendidikan Tambusai Vol. 9 No. 2 (2025): Agustus
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai, Riau, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jptam.v9i2.29899

Abstract

Motivasi belajar adalah hal yang sangat penting ada dalam diri seorang pembelajar. Motivasi yang tinggi akan membantu untuk mencapai kompetensi diri. Kesadaran mengenai pentingnya memiliki kompetensi perlu ditingkatkan, termasuk bagi mahasiswa sebagai calon Tenaga Kerja Nasional. Mahasiswa sebagai calon sarjana perlu memiliki kesadaran secara personal bahwa dirinya akan dihadapkan pada tuntutan untuk cakap sebagai seorang intelektual, sekaligus mempunyai keterampilan dan mengasah sikap kerja untuk bisa bersaing di dunia industry. Penelitian Ini bertujuan Untuk memodelkan factor cara belajar, fasilitas belajar dan lingkungan terhadap motivasi belajar mahasiswa. Variabel pada Penelitian Ini bersifat laten yaitu tidak diukur secara langsung, melainkan diukur melalui indikatornya. Oleh karena itu, metode yang digunakan pada penelitian ini adalah Structural Equation Modeling (SEM). Hasil penelitian ini menunjukkan bahwa variable indicator secara konstruk valid mengukur variable latennya. Nilai R square model sebesar  0,837. Hal ini tergambar dari seluruh indicator model memiliki pengaruh yang signifikan terhdap variable laten. Hal ini menunjukkan bahwa model dapat diterima karena nilai R square yang tinggi, maka variable cara belajar, fasilitas belajar memiliki pengaruh yang kuat terhadap Motivasi belajar.
Eksplorasi konsep matematis dalam tari Ratoe Jaroe Febriyan, Merliyana; Asiani, Rosi Widia; Muslimahayati; Multahadah, Cut; Marisa, Susi; Bulan, Defina Dwi; Pratiwi, Nurul
Jurnal Pendidik Indonesia Vol. 6 No. 2 (2025): Jurnal Pendidik Indonesia
Publisher : Karoteh Utama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61291/jpi.v6i2.178

Abstract

Ethnomathematics is an approach that connects mathematical concepts with elements of local culture. In this context, education and culture are closely interrelated in shaping students’ understanding of mathematics. This study aims to explore mathematical concepts embedded in Ratoh Jaroe Dance, a traditional dance from Aceh, and its potential to support mathematics learning in schools. A qualitative method with an ethnographic approach was employed, involving observation, interviews, and documentation as data collection techniques. Data were analyzed through data reduction, presentation, and conclusion drawing. The findings reveal that the activities in Ratoh Jaroe Dance reflect ethnomathematical practices such as counting, measuring, pattern design, and spatial positioning. Identified mathematical concepts include geometry, set theory, and transformation. The implementation of these findings in extracurricular activities at SMAN 28 Tangerang Regency had a positive impact by enhancing students’ ability to relate mathematics to local culture and encouraging creative thinking.
Co-Authors Andre Kurniawan Arafat, Andril Asiani, Rosi Widia Bulan, Defina Dwi Dwi Bulan, Defina Febriyan, Merliyana Multahadah, Cut Muslimahayati Nurul Pratiwi Zainal Abadi