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Fatmala, Rita Iva
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Physics

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Recycling Surgical Mask as Acoustic Panel using Hand Lay-Up Methods Fatmala, Rita Iva; Yulianti, Ian; Fianti, Fianti
Physics Communication Vol 6, No 1 (2022): February 2022
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v6i1.33898

Abstract

The research was conducted to recycle surgical masks as acoustic panels using hand lay-up methods and to test their effectiveness in reducing noise using the tube method. The frequency used as a sound source is 495 Hz. Tests were carried out with variations in panel thickness, they are 1 cm, 2 cm, 3 cm, 4 cm, and 5 cm and three variations composite material, they are first layer, second layer and third layer of surgical mask. The panel test results show that the thicker acoustic panels are more effective in reducing noise based on the regression analysis that show the thicker panel from three variations composite material is 0.98, 0.99 and 0.96, respectively all of which are included in the very strong category. In addition, ANOVA analysis show that the thicker panels from all variation composite material respectively was 0.002, 0.001 and 0.009, they are showed the significant effect between the thickness of the panel and the effectiveness of the panel in reducing noise. Furthermore, based on the regression analysis from acoustic panels composite made of surgical masks from first layer, second layer and third layer were 8.24, 8.39 and 5.81, respectively the panel acoustic from second layer surgical masks are more effective to reduce the noise than other layer. Overall, it can be concluded that acoustic panels made of surgical masks are effective in reducing noise, as well as a solution to increasing surgical mask waste during the Covid-19 pandemic.
Development of Test Instruments in Substance Pressure to Measure Student's Numerical Literacy Ability Fatmala, Rita Iva; Rusilowati, Ani; Astuti, Budi
Physics Communication Vol 7, No 1 (2023): February 2023
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/physcomm.v7i1.36920

Abstract

The purpose of this study was to develop an instrument test to measure student's numeracy literacy skills on substance pressure and its application. The research was conducted using the Research and Development (RD) development method trough the ADDIE research design (Analysis, Design, Development, Implementation, and Evaluation) through several stages, namely curriculum analysis, content analysis, context analysis, and determining instrument framework, instrument development, pilot testing instrument and item analysis of the instrument. The trial was conducted on a sample determined by a random sampling technique. The item analysis of the instrument includes item validity test, item reliability test, item difficulty level, and item discriminatory power. The results of this study were the test instrument of numeracy literacy in the form of multiple-choice questions with 18 reliable questions with a reliability coefficient of 0.903. Based on the validity test, there are 5 questions with moderate validity category, 10 questions with high validity category, and 3 questions with very high validity category. Based on the results of the discriminatory power test and the level of difficulty of the questions, it was obtained that all questions had distinguishing power in the good category with the difficulty level of the questions in the easy, medium, and difficult category are 1, 13, and 4 questions, respectively. Therefore, it can be concluded that the numerical literacy test instrument on the substance pressure material and its application can be used as a test instrument to measure student's numeracy literacy skills.
Co-Authors Ani Rusilowati Budi Astuti Fianti Fianti, Fianti Ian Yulianti, Ian