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All Journal REKAYASA Journal of Innovative Science Education
Wahyudi, Ikwan
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Agriculture, Biological Sciences & Forestry Computer Science & IT Education Electrical & Electronics Engineering Engineering Physics

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Karakteristik Kombucha dengan Penambahan Ekstrak Kayu Manis (Cinnamomum burmannii) dan Kayu Secang (Caesalpinia sappan) pada Proses Fermentasi Sekunder Wahyudi, Ikwan; Lisdiana, Lisdiana; Astuti, Budi
Rekayasa Vol 16, No 3: Desember 2023
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v16i3.17791

Abstract

This study aims to determine the characteristics of kombucha produced from a secondary fermentation process with the addition of extracts of cinnamon (Cinnamomum burmannii) and secang wood (Caesalpinia sappan). The study used a RAK design with 2-factor treatments and 4 replications. Treatment factors included the addition of ingredients (control, cinnamon, and secang wood) and secondary fermentation time (24, 48, and 72 hours). Characteristics observed include analysis of pH, density, and color (Lab). The results showed that there were significant differences in the pH value, density, and color due to the various treatments of adding ingredients. The pH value and density of kombucha did not differ significantly due to the variation in secondary fermentation time, but there were significant differences in the color of kombucha based on the secondary fermentation time.
Evaluation of STEM Literacy Test Instrument on Elements, Compounds and Mixtures Using Multidimensional Rasch Analysis Wahyudi, Ikwan; Rusilowati, Ani; Nugroho, Sunyoto Eko; Wiyanto, Wiyanto; Widiyatmoko, Arif
Journal of Innovative Science Education Vol. 13 No. 2 (2024): August 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jise.v13i2.4611

Abstract

STEM literacy is crucial in the 21st century, encompassing science, technology, engineering, and mathematics, allowing individuals to understand and apply conceptual knowledge to real-life problems. Evaluation of STEM literacy instruments is essential for improving the quality of STEM learning. This study aims to evaluate the STEM literacy test instrument using multidimensional Rasch analysis. This study employed a quantitative approach, including a description to validate the research instrument. The instrument consists of 22 items measuring science, technology, engineering, and mathematics literacy, focusing on elements, compounds, and mixtures. Participants included 259 eighth-grade students randomly selected from public junior high schools in Balongpanggang and Benjeng, Gresik, East Java. Data analysis employed a Rasch model with ConQuest programs. Results indicated that the multidimensional model had better-fit parameters than the unidimensional model and demonstrated that the item's validity and instrument's reliability meet requirements. The interaction between students' abilities and items revealed that most students have moderate to low STEM literacy abilities. Additionally, the analysis found no differential item functioning based on gender differences. This research indicates that multidimensional Rasch analysis helps evaluate STEM literacy test instruments so that valid and reliable instruments can provide accurate measurements in improving students' STEM literacy skills.
Co-Authors Ani Rusilowati Arif Widiyatmoko, Arif Budi Astuti Lisdiana Lisdiana Sunyoto Eko Nugroho, Sunyoto Eko Wiyanto -