Article Per Year (5 Year)
p-Index From 2021 - 2026
0.444
P-Index
This Author published in this journals
All Journal Pendas : Jurnah Ilmiah Pendidikan Dasar Journal of Experimental and Applied Physics
Ratnawulan
Unknown Affiliation
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Optical Characteristics Of Nano-Talc/TiO2 Thin Layer ; A Preliminary Study Vitrini, Nora; Jonuarti, Riri; Ratnawulan; Hidayat, Rahmat
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.81

Abstract

This study tested the effect of 50%:50% concentration nano-Talc/TiO2 on optical and photocatalytic properties thin layer activity. The goal is to understand how 50%:50% concentration affects absorption, reflection and transmission as as well as photocatalytic activity of thin layer. This research is experimental, starting with grinding Talc and TiO2, followed by dilution layer synthesis using the spin coat technique. Characterization includes cross-section morphology analysis using SEM, absorption, reflection, transmission and energy measurements slit with a UV-Vis DR spectroscope, as well as photocatalytic activity test. The research results show that the coating process managed to increase absorption by (92-98)% and energy band gap of 2.93 eV while reflection and transmission are reduced by (0.5-4)%, as well as the lowest rate of photocatalytic activity degradation rate of 0%, causing low ROS under light sunlight protective layer.
ANALISIS KEBUTUHAN PENGEMBANGAN E-LKPD BERBASIS PBL UNTUK MEMFASILITASI KETERAMPILAN BERPIKIR KRITIS SISWA Sari, Mustika; Stivani Suherman, Dea; Ratnawulan; Ulmi, Fauziah
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 03 (2026): Volume 11 No. 03, September 2026 Release
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i03.60661

Abstract

This study aims to analyze the needs for developing a dynamics electronic student worksheet (E-SWS) based on the Problem-Based Learning (PBL) model to facilitate students' critical thinking skills. The study employed a descriptive research design using the 4D development model, with a particular focus on the define stage. The research instruments consisted of interview guidelines, a student characteristics questionnaire, and a critical thinking skills test. Data were analyzed using both qualitative and quantitative approaches. The findings revealed that technology-based instructional materials to support the improvement of students' critical thinking skills were not yet available. The average critical thinking score of the students was classified as very low, with a mean score of 50.88. The analysis of students' characteristics indicated generally positive results; however, these characteristics were not supported by the implementation of appropriate learning models and instructional materials, which contributed to their low critical thinking skills. Therefore, it can be concluded that the development of a PBL-based electronic student worksheet (E-SWS) is necessary to facilitate the improvement of students' critical thinking skills.
Co-Authors Fauziah Ulmi Mustika Sari, Mustika Rahmat Hidayat Riri Jonuarti Stivani Suherman, Dea Vitrini, Nora