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All Journal Jurnal Ilmiah Pendidikan Fisika Jurnal Pengabdian Masyarakat Bhinneka
Lestari, Rika Tri Intan
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Agriculture, Biological Sciences & Forestry Computer Science & IT Economics, Econometrics & Finance Education Physics Public Health

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Optimalisasi Value Added Limbah Plastik Dengan Teknologi Mesin Crusher Kurniawati, Maris; Mustikowati, Rita Indah; Sundayagara, Candra; Anggraini, Inggar Dewi; Lestari, Rika Tri Intan; Maulida, Shofiyah
Jurnal Pengabdian Masyarakat Bhinneka Vol. 3 No. 2 (2024): Bulan November
Publisher : Bhinneka Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58266/jpmb.v3i2.105

Abstract

Pengelolaan limbah plastik menjadi salah satu tantangan utama dalam menjaga kelestarian lingkungan. Kegiatan ini  bertujuan untuk mengoptimalkan value added (nilai tambah) limbah plastik melalui penerapan teknologi mesin crusher, yang diharapkan dapat meningkatkan efisiensi proses daur ulang. Metode yang digunakan meliputi pengoperasian mesin mesin dilakukan dengan metode workshop dari tenaga ahli mesin, demonstrasi ploting, dan praktek langsung oleh mitra.Hasil menunjukkan bahwa penggunaan mesin crusher tidak hanya mempercepat proses pengolahan limbah plastik, tetapi juga meningkatkan kualitas material daur ulang yang dihasilkan, sehingga dapat memberikan nilai tambah ekonomi bagi pelaku usaha daur ulang. Optimalisasi teknologi ini diharapkan dapat menjadi solusi yang efektif dalam mengurangi jumlah limbah plastik.
Exploration of Sound Wave Concept in the Making and Playing of Yogyakarta Gamelan: STEM Learning Approach Lestari, Rika Tri Intan; Aji, Sudi Dul; Jufriadi, Akhmad
Jurnal Ilmiah Pendidikan Fisika Vol 9, No 3 (2025): OCTOBER 2025
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jipf.v9i3.15638

Abstract

This study explores the concept of sound waves in the making and playing of Yogyakarta gamelan through a STEM (science, technology, engineering, and mathematics) learning approach, addressing the urgent need for scientific documentation amid the declining sustainability of this cultural heritage. Using a descriptive qualitative method with a case study design, the research examines the material composition, forging techniques, and acoustic properties of gamelan, incorporating insights from four experienced gamelan craftsmen and a gamelan practitioner (wiyaga) in Yogyakarta. Findings reveal that the optimal bronze composition (a 77:23 copper-tin ratio) and traditional manufacturing processes significantly influence sound characteristics, such as sustain, harmonic richness, and tonal depth, aligning with principles of material physics (Young's modulus, density, and damping coefficient) and vibration mechanics. Despite practitioners' reliance on empirical knowledge, their techniques demonstrate an implicit understanding of STEM concepts, particularly in tuning and sound optimization. However, a disconnect remains between scientific terminology and traditional practice, highlighting the need for culturally sensitive STEM integration in gamelan education. The study concludes that a holistic STEM approach can bridge scientific and cultural perspectives, supporting both the preservation of Yogyakarta gamelan and innovative educational models. Recommendations include STEM-based training for artisans and further research on alternative materials while preserving traditional sound aesthetics.
Co-Authors Akhmad Jufriadi Anggraini, Inggar Dewi Maris Kurniawati Maulida, Shofiyah Rita Indah Mustikowati Sudi Dul Aji Sundayagara, Candra