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All Journal Geosains Kutai Basin Faraday: Journal of Fundamental Physics, Research, and Applied Science
Perwitasari, Devina Rayzy
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Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Studi Numerik Upwelling di Daerah Perairan Kalimantan Timur Maulana, Restu Agesta Dwi; Yusuf, Mustaid; Perwitasari, Devina Rayzy
GEOSAINS KUTAI BASIN Vol 4 No 1 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i1.739

Abstract

The aim of this study is to predict the potential upwelling areas around East Kalimantan Waters, based on vertical current velocity, temperature, and salinity information through the COHERENS (A Coupled Hydrodynamical-Ecological Model for Regional and Shelf Seas) simulation, a three-dimensional hydrodynamic model. The model was performed simulation for one year period (1st January – 31th December 2016). Four major tidal constituents (M2, S2, K1, O1) and wind speed have used as generating force. The simulation results showed the upwelling areas as well as downwelling. The upwelling area located mostly in the southern parts of the Makassar Strait while only a few areas located in the vicinity of the East Kalimantan coastline.
Studi Perubahan Fase Bulan Terhadap Nilai Tunggang Pasang Surut dan Slack Water dari Penanggalan Hijriah Rizqi, Puteri Buana; Perwitasari, Devina Rayzy; Mandang, Idris
GEOSAINS KUTAI BASIN Vol 4 No 2 (2021)
Publisher : Geophysics Study Program, Faculty of Mathematics and Natural Sciences, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/geofisunmul.v4i2.716

Abstract

Penanggalan hijriah atau biasa disebut sebagai penanggalan islam adalah sistem penanggalan yang menggunakan pergerakan bulan sebagai acuannya. Dalam ilmu Oseanografi, pergerakan bulan mempengaruhi dinamika pasang surut. Tujuan dilakukannya penelitian ini adalah mengetahui hubungan fase bulan terhadap tunggang pasang surut dan slack water. Penelitian ini berlokasi di Dermaga Pantai Mutiara Muara Badak pada tanggal 29 Januari – 17 Februari 2107. Penelitian ini menggunakan metode Least Square untuk menganalisis konstanta pasang surut dan algoritma Fast Fourier Transform untuk tipe pasang surut. Hasil yang didapatkan adalah pasang tertinggi terjadi saat masuknya bulan purnama dikarenakan posisi bumi dan bulan sejajar dengan matahari sehingga gaya tariknya lebih besar. Penelitian ini diharapkan dapat memberi informasi tentang penentuan penanggalan hijriah menurut nilai tunggang pasang surut.
Monitoring of Raw and Treated Water Quality Based on Nitrate Parameter at Ngagel Water Treatment Plant Using Spectrophotometry Method Sudrajat, Oka Akbar; Wardhani, Primasari Cahya; Timur, Fajar; Pravitasari, Rizky; Rizkiarna, Reffany Choiru; Perwitasari, Devina Rayzy
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 1 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i1.6

Abstract

This research focuses on monitoring the water quality at the Ngagel Water Treatment Plant in Surabaya by analyzing the nitrate (NO₃⁻) content in both raw and treated water. Nitrate is a key indicator of water pollution, often originating from agricultural runoff, sewage, and industrial discharge. Samples were collected monthly from January to March 2024 at two locations: the raw water intake from the Surabaya River and the treated water output ready for distribution. Laboratory testing using spectrophotometric methods showed that nitrate levels in raw water ranged between 2.44 mg/L and 3.50 mg/L, while treated water showed a slightly lower range between 2.00 mg/L and 3.00 mg/L. These results indicate a consistent reduction in nitrate concentrations after treatment, demonstrating the efficiency of the Ngagel Water Treatment Plant’s processes. Importantly, all measured values were significantly below the maximum allowable limit of 50 mg/L, as stated in the Indonesian Ministry of Health Regulation No. 492/MENKES/PER/IV/2010. This confirms that the treated water is safe for human consumption with regard to nitrate levels. The study highlights the importance of continuous water quality monitoring to ensure public health protection and to maintain the effectiveness of water treatment facilities over time.
Co-Authors Idris Mandang, Idris Maulana, Restu Agesta Dwi Pravitasari, Rizky Rizkiarna, Reffany Choiru Rizqi, Puteri Buana Sudrajat, Oka Akbar timur, fajar Yusuf, Mustaid