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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) JRST (Jurnal Riset Sains dan Teknologi)
Ika Vidiasari Aristawati
Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Materials Science & Nanotechnology Physics

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Implementation of Modified Problem Based Learning (PBL) in Improving Learning Outcomes of Physics Vocational School for Optical Materials Ika Vidiasari Aristawati; Wiyanto Wiyanto; Budi Astuti
Jurnal Penelitian Pendidikan IPA Vol. 7 No. SpecialIssue (2021): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v7iSpecialIssue.869

Abstract

The purpose of research on the implementation of Problem Based Learning (PBL) can improve students' physics learning outcomes in terms of knowledge and skills. Classroom Action Research was conducted in two cycles, the subject of the research was class X APHP 03 with 35 students. The data collection method used was a test for knowledge and skill aspects through observation. Qualitative descriptive data analysis method for the knowledge aspect by percentage of students' mastery level classically and the skill aspect through the observation sheet scoring. Learning outcomes from cycle I and cycle II have increased in the knowledge aspect by 17.14%. Aspects of student skills increase in the indicators of systematic presentation, mastery of the material and pronunciation at the time of presentation, so that the implementation of Problem Based Learning can improve student learning outcomes
Aplikasi Rockwool sebagai Material Absorben Gelombang Bunyi Ika Vidiasari Aristawati; Agus Yulianto; Upik Nurbaiti
JRST (Jurnal Riset Sains dan Teknologi) Volume 6 No. 1 Maret 2022: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1195.574 KB) | DOI: 10.30595/jrst.v6i1.10895

Abstract

Telah dilakukan penelitian untuk menentukan nilai koefisien dan efektivitas absorbsi  bunyi dengan resonansi space dan sound level meter TS 1351. Material yang digunakan rockwool dengan variasi ketebalan 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm dan 7 cm. Pengukuran pada frekuensi sumber 2000 Hz, 3000 Hz, 4000 Hz, 5000 Hz, 6000 Hz dan 7000 Hz. Koefisien koefisien absorbsi rockwool (α) bernilai 0,04 – 0,08 dan terdapat perbedaan pada ketebalan 1 cm dan 2 cm disebabkan tingkat kerapatan rockwool yang berbeda. Efektivitas absorbsi terhadap kemampuan menyerap bunyi paling baik dimiliki oleh ketebalan 7 cm. Pada ketebalan 7 cm memiliki efektivitas absorbsi pada range frekuensi yang tinggi antara frekuensi 4000 Hz, 5000 Hz, 6000 Hz dan 7000 Hz dengan nilai efektivitas 27,86%, 30,84%, 31,24% dan 29,95%. Sedangkan frekuensi 2000 Hz dan 3000 Hz nilai efektivitas absorbsi pada ketebalan rockwool 6 cm dengan nilai 31,78% dan 27,27%. Sehingga rockwool dapat digunakan sebagai media/bahan absorbsi gelombang bunyi pada range frekuensi tertentu.
Co-Authors Agus Yulianto Budi Astuti Upik Nurbaiti Wiyanto Wiyanto