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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) ORBITA: Jurnal Pendidikan dan Ilmu Fisika Pillar of Physics: Jurnal Berkala Ilmiah Fisika JURNAL PENELITIAN BIDANG PENDIDIKAN EINSTEIN (E-JOURNAL)
Silvia Dona Sari
Universitas Negeri Medan
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Other

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Analysis of ground water distribution using robust constrain inversion determination geoelectric data of wenner configuration type in Bukit Lantiak, Padang Selatan District Silvia Dona Sari
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (615.416 KB) | DOI: 10.24036/1851171074

Abstract

The aimed of this research are to determine the distribution, depth, and types of groundwater aquifers in Bukit Lantiak  Padang Selatan area. Distribution of groundwater in Bukit Lantiak are important to know to anticipated landslide cause increase in soil water content in the slope. This research used resistivity geoelectric method of Wenner configuration. Data of this research taken four tracks using ARES (Automatic Resistivity). Interpretation data was done by with Robust Constraint inversion. The results of this research showed that distribution of soil water on Tracks 1, 3, and 4 tend to lead from the Northeast to the Southwest. Distribution of groundwater in track 2 leads from West to East. Into the ground water ranged from 5.76 to 30.2 m were obtained. Type aquifer is an aquifer that is found free and depressed. Free aquifers that can trigger landslides from on track 1
ANALISIS ASAM KLOROGENAT PADA BUBUK KOPI ROBUSTA GAYO (Coffean canephora) MENGGUNAKAN SPEKTROFOTOMETER UV-VIS Silvia Dona Sari; Zuhairiah Zuhairiah; Muhammad Risky Akbar Siregar
EINSTEIN (e-Journal) Vol 11, No 3 (2023): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/eins.v11i3.50900

Abstract

Kopi merupakan minuman yang populer dan digemari oleh hampir sebagian besar penduduk di dunia karena kopi tidak saja memberikan aroma dan rasa yang khas tetapi juga memberikan banyak manfaat bagi Kesehatan. Selain itu, kopi dijadikan sebagai komoditas andalan dalam sector perkebunan Indonesia (Chandra dkk, 2013). Tujuan dari penelitian ini adalah : “Menganalisis kandungan asam klorogenatdalam kopi Robusta dengan Teknik penyeduhan yang berbeda yang dianalisi dengan Spektrofotometri UV- Visible. Metode yang digunakan Spektrofotometri UV- Visible. Penentuan asam Klorogenat pada bubuk kopi robusta gayo padan panjang gelombang 324 nm didapatkan hasil yaitu pada peneduhan tubruk 22,71 % sedangkan penyeduhan cold brew didapatkan 21,66 % Bubuk kopi dengan penyeduhan tubruk memiliki kadar asam klorogenat tertinggi dibandingkan penyeduhan cold brew.Kata Kunci: Kopi Robusta, Asam Klorogenat, Spektrofotometri Uv- Visible.
ANALISIS MODEL PEMBELAJARAN AKTIF BERBASIS PROYEK UNTUK MENINGKATKAN PEMAHAMAN KONSEP FISIKA Yanthy Leonita Perdana Simanjuntak; Silvia Dona Sari; Eviyona Laurenta Br Barus
JURNAL PENELITIAN BIDANG PENDIDIKAN Vol 30, No 1 (2024)
Publisher : LPPM Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpbp.v30i1.57015

Abstract

Penelitian ini bertujuan untuk menganalisis efektivitas model pembelajaran aktif berbasis proyek dalam meningkatkan pemahaman konsep fisika pada mahasiswa Jurusan Fisika Universitas Negeri Medan. Pemahaman konsep fisika merupakan aspek kunci dalam pendidikan fisika, namun sering kali mahasiswa mengalami kesulitan dalam memahaminya. Model pembelajaran aktif berbasis proyek menawarkan pendekatan yang berpotensi untuk mengatasi hambatan-hambatan tersebut dengan melibatkan mahasiswa secara aktif dalam proyek-proyek fisika yang relevan. Dengan menggunakan pendekatan kualitatif dan kuantitatif, penelitian ini akan mengumpulkan data tentang pemahaman konsep fisika sebelum dan sesudah penerapan model pembelajaran. Data akan dianalisis untuk mengevaluasi dampak model pembelajaran terhadap pemahaman konsep fisika mahasiswa serta merumuskan rekomendasi untuk pengembangan pendidikan fisika di tingkat perguruan tinggi. Hasil penelitian ini diharapkan dapat memberikan kontribusi yang berharga bagi peningkatan kualitas pembelajaran fisika di Universitas Negeri Medan dan institusi pendidikan tinggi lainnya.
PENGEMBANGAN PENUNTUN PRAKTIKUM MATAKULIAH FISIKA UMUM BERBASI CASE METHOD DAN TEAM BASED-PROJECT: DESIGN DAN DEVELOPMENT Lubis, Rajo Hasim; Panggabean, Deo Demonta; Sari, Silvia Dona; Silaban, Adeline
ORBITA: Jurnal Pendidikan dan Ilmu Fisika Vol 9, No 2 (2023): November
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/orbita.v9i2.17000

Abstract

ABSTRAKPraktikum merupakan salah satu strategi pembelajaran yang dapat menarik minat mahasiswa dalam mengembangkan konsep-konsep Fisika. Praktikum sangat erat hubungannya dengan pembelajaran Fisika karena membutuhkan verifikasi, pembuktian melalui praktikum dan pembelajaran fisika penuh dengan teori, konsep, hukum, prinsip dan kaidah tentang fisika, yang semuanya itu perlu diadakan pembuktian melalui praktikum. Permasalahan yang ditemukan pada praktikum matakuliah Fisika Umum bahwa tidak tersedianya standar pedoman praktikum. Tujuan penelitian adalah membuat standar panduan praktikum Fisika Umum berupa Smart Module Penuntun Praktikum Fisika Umum yang berbasis Case Method dan Team-Based Project. Jenis Penelitian adalah R&D dengan model pengembangan 4-D yang dikemukakan Thiagarajan dan Semmel.Teknik pengumpulan data berupa instrumen penilaian angket validasi materi, angket validasi media, angket validasi soal, dan angket respon siswa. Berdasarkan hasil validasi Penuntun Praktikum Fisika Umum yang berbasis Case Method dan Team-Based Project adalah valid dengan kategori baik dan bisa dilanjutkan untuk uji lapangan serta diharapkan meningkatkan keterampillan pemecahan masalah, berpikir kritis dan berpikir kreatif mahasiwa. Kata kunci: penuntun praktikum; fisika umum; case method dan team-based project. ABSTRACTPracticum is a learning strategy that can attract students' interest in developing physics concepts. Practicum is very closely related to learning Physics because it requires verification, proof through practicum and physics learning is full of theories, concepts, laws, principles and rules about physics, all of which need to be proven through practicum. The problem found in the practicum course in General Physics is that there is no standard practicum guideline available. The aim of the research is to develop a general physics practicum guide standard in the form of a General Physics Practicum Guide Smart Module based on the Case Method and Team-Based Project. The type of research is R&D with the 4-D development model proposed by Thiagarajan and Semmel. Data collection techniques are in the form of material validation questionnaires, media validation questionnaires, question validation questionnaires, and student response questionnaires. Based on the validation results of the General Physics Practicum Guide based on the Case Method and Team-Based Project, it is valid in the good category and can be continued for field trials and is expected to improve problem solving skills, critical thinking and creative thinking of students. Keywords: practicum guide; general physics; case method and team-based project.
ANALYSIS OF GRANITE ROCK WEATHERING IN THE PARMONANGAN AREA USING LANDSAT 8 SATELLITE IMAGERY Juliani, Rita; Rahmatsyah, Rahmatsyah; Tampubolon, Togi; Halawa, Erniwati; Sari, Silvia Dona; Purba, Rama Yana
EINSTEIN (e-Journal) Vol. 12 No. 3 (2024): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/eins.v12i3.63264

Abstract

 A research has been conducted to analyze the weathering of granite rocks in the Parmonangan area using Lansat 8 satellite imagery which aims to determine the distribution of rocks, weathering processes, and types of rock forming elements in Parmonangan District, North Tapanuli Regency. The method used is using shp geologic map data and Lansat-8 image data processed using Arcgis Map 10.6.1 to determine the distribution of rocks and land cover. XRF is used to identify compounds and rock-forming elements. The results obtained by the rock distribution of the parmonangan area are in the form of the Kluet Formation, Sibolga Complex and Toba Tuff. Land cover in the parmonagan area has differences from 2016 to 2024. Open land in 2024 has increased and the cloud cover obtained has also increased. The rock elements found are Al2O3 (25.31), SiO2 (24.97), K2O (1.56), TiO2 (0.81), Mn2O (30.66), Fe2O3 (4.66), ZrO2, (0.21), Sb2O3 (0.16), and BaO (0.17).
Analysis of Rare Earth Metal Potential of Parmonangan Area Using X-Ray Fluorescence Rita Juliani; Rahmatsyah; Togi Tampubolon; Erni Halawa; Silvia Dona Sari; Ismayana; Rama Yana Purba
Jurnal Penelitian Pendidikan IPA Vol 11 No 5 (2025): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i5.10355

Abstract

Rare Earth Elements (REEs) are strategic commodities essential for various high-technology applications, including renewable energy, electronics, and defense systems. However, their uneven global distribution and increasing demand have intensified the need for exploration in undercharacterized regions. This study investigates the REE potential of weathered granitic rocks in the Pamonangan Sub-district, North Sumatra. A total of 200 mesh rock samples from outcrop and subsurface locations were analyzed using X-Ray Fluorescence (XRF) to determine their elemental composition. The geochemical results show high concentrations of SiO₂ and Al₂O₃ relative to Fe₂O₃, suggesting significant weathering of the granitic parent rocks. The combination of elevated SiO₂ and low P₂O₅ contents indicates a predominance of silica-hosted REE phases over phosphate-hosted minerals. Mineralogical analysis confirms the presence of cassiterite, chlorite, monazite, and zircon as secondary REE carriers, particularly of Ce and La. These findings point to a previously unrecognized potential for REE mineralization in the region. This research provides a geochemical and mineralogical framework for future exploration and highlights the importance of weathered granitoids as prospective REE sources in Indonesia.
Co-Authors Erni Halawa Eviyona Laurenta Br Barus Halawa, Erniwati Ismayana Muhammad Risky Akbar Siregar Purba, Rama Yana Rahmatsyah Rahmatsyah Rahmatsyah, Rahmatsyah Rajo Hasim Lubis Rama Yana Purba Rita Juliani Sembiring, Rinawati Silaban, Adeline Togi Tampubolon Togi Tampubolon Yanthy Leonita Perdana Simanjuntak Zuhairiah Nasution, Zuhairiah