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All Journal JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Journal Of World Science
Maula, Frida Yassar
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Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Health Professions Law, Crime, Criminology & Criminal Justice Physics Social Sciences

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Identification of Underground Rivers Using Very Low Frequency Electromagnetic and Graphical User Interface Matrix Laboratory: Implications for Groundwater Exploration Umam, Rofiqul; Sismanto, Sismanto; Umar, Emi Prasetyawati; Siregar, Rahmat Nawi; Maula, Frida Yassar; Takahashi, Hirotaka
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 14 No 2 (2025): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v14i2.27746

Abstract

The research aims to detect underground rivers using 2D mapping and minimal-noise data. In this research, 2-dimensional (2D) mapping of underground rivers in karst areas was carried out using the geophysical method of very low-frequency electromagnetic waves, namely VLF-EM (Very Low Frequency Electromagnetic Method). Electromagnetic wave analysis is based on differences in object frequencies, which reflect subsurface resistivity and conductivity and are captured by the VLF-EM detector. The measurement results were analyzed using three filter equations (Moving Average, Fraser, and Karous H-Jelt) and the Graphics User Interface Matrix Laboratory (GUI-MatLab) Software. Apart from that, the use of GUI-MatLab aims to create VLF-EM data processing software that is better for 2D interpretation display and more efficient in processing (requiring data entry only once). The research area was located in the karst rock area of Gunung Kidul Regency, Yogyakarta, Indonesia, at coordinates 8.020°S and 110.36°E. The VLF-EM measurements and GUI-MatLab interpretation detected the presence of underground river flow crossing three villages in the study area (Timun Sari, Mojo Sari, and Peyuyon), with accurate results (conductive objects were easily distinguished). Therefore, based on this study, it is recommended that productive boreholes be drilled in the 3 villages where VLF measurements were taken. The productive borehole drilling is recommended in 3 villages.
A Profile of the Critical Thinking Skills of Prospective Elementary School Teachers Regarding the Concept of the Human Digestive System Laeni, Mega; Maula, Frida Yassar
Journal of World Science Vol. 5 No. 4 (2026): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v5i4.1661

Abstract

Critical thinking skills are essential competencies that students who are prospective elementary school teachers must possess to face the challenges of the 21st century. This research aims to analyze the critical thinking ability profile of prospective elementary school teacher students on the concept of the human digestive system. The research method used was quantitative descriptive with 48 research subjects of the second semester of the PGSD Study Program. The data collection instrument was in the form of an essay test of 10 questions that included five indicators of critical thinking. The results showed that the average score of students' critical thinking ability was 23.19 (57.97%) which was included in the medium category. Based on the achievement of indicators, the highest percentage was achieved in the concluding indicator (66%), while the lowest percentage was found in the indicator of building basic skills (51%). This shows that although students are able to draw contextual conclusions, they are still weak in formulating in-depth scientific arguments.
Co-Authors Laeni, Mega Prasetyawati Umar, Emi Rofiqul Umam Siregar, Rahmat Nawi Sismanto Sismanto Takahashi, Hirotaka