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All Journal Jurnal Multidisiplin Indonesia Jurnal Penelitian Pembelajaran Fisika
Syifa Fauzia
UIN Syarif Hidayatullah Jakarta
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Economics, Econometrics & Finance Education Law, Crime, Criminology & Criminal Justice Physics

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Analysis Of Bias And Purity Indices In Packaged Cooking Oil And Bulk Cooking Oil Using The Diffraction Grid Method Syifa Fauzia; Luma Alfiasti Sulton; Ayu Aulia Asyhari; Ahmad Suryadi; Fuji Hernawati Kusumah
Jurnal Multidisiplin Indonesia Vol. 1 No. 3 (2023): September : Jurnal Multidisiplin Indonesia
Publisher : PT. ALHAFI BERKAH INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62007/joumi.v1i3.185

Abstract

Cooking oil is a fundamental daily necessity, and both packaged and bulk oils are susceptible to structural changes and contamination that can influence the bias index. This research aims to analyze the purity of packaged and bulk cooking oil, investigate the relationship between the bias index and usage time, and identify factors influencing the bias index in both types of cooking oil using the diffraction grid method. The study revealed bias indices produced from packaged cooking oil before usage, after 10 minutes of usage, and after 15 minutes of usage, namely 5.08×108; 5.22×108 and 3.94×108, respectively. The bias indices from bulk cooking oil under the same conditions were 4.68×108; 3.61×108 and 3.37×108, respectively. Based on the research results, it is evident that packaged cooking oil exhibits a higher level of purity compared to bulk cooking oil. The relationship between the bias index and usage time is inversely proportional, indicating that the longer the cooking oil is used, the smaller the Refractive Index value becomes.
Development of a Renewable Energy Model Based on Discovery Learning to Improve Students’ Critical Thinking Skills Syifa Fauzia; Erina Hertanti; Fuji Hernawati Kusumah
Jurnal Penelitian Pembelajaran Fisika Vol. 17 No. 1 (2026): JANUARY 2026
Publisher : Program Studi Pendidikan Fisika, Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/jp2f.v17i1.3336

Abstract

The low critical thinking skills of students in renewable energy learning and the limited availability of teaching aids that integrate various renewable energy sources are the background of this research. This research aims to develop a renewable energy model based on discovery learning to improve students' critical thinking skills. This research uses a development research model consisting of four stages: preliminary research, prototyping stage, formative evaluation and summative evaluation. This research was conducted at MA Al-Khairiyah North Jakarta involving experts, teachers, and grade 10 students. The model integrates two renewable energy sources (solar and wind) in one system equipped with student worksheets based on discovery learning. Data were collected through expert validation questionnaires, student and teacher response questionnaires, and critical thinking ability tests. The results showed that the model met the criteria of feasibility, practicality, and effectiveness. Based on validation by media experts and subject matter experts, the model obtained percentage scores of 83.24% and 86%, respectively, with an average of 84.62%, included in the very feasible category. The practicality assessment showed a score of 93.75% from students and 87.5% from teachers, both categorized as very practical. The effectiveness aspect received a score of 90.6% from teachers, categorized as very effective. Students' critical thinking skills showed consistent improvement across all stages of the evaluation with n-gain values ​​ranging from 0.30 to 0.46, included in the moderate category. In conclusion, the renewable energy model based on discovery learning has proven effective in helping students understand the concept of renewable energy and improve their critical thinking skills through active learning experiences and observations.
Co-Authors Ahmad Suryadi, Ahmad Ayu Aulia Asyhari Fuji Hernawati Kusumah Hertanti, Erina Luma Alfiasti Sulton