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All Journal Jurnal MIPA Fullerene Journal of Chemistry Charm Sains : Jurnal Pendidikan Fisika Jurnal FisTa : Fisika dan Terapannya
Jeferson Polii
Universitas Negeri Manado
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics

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Pemodelan Penurunan Tekanan Brine di Dalam Pipa Injeksi pada Lapangan Panas Bumi Dieng Polii, Jeferson
Jurnal MIPA Vol 6, No 2 (2017)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jm.6.2.2017.17332

Abstract

Injeksi brine hasil dari fluida produksi panas bumi digunakan untuk mengisi volume pori batuan reservoir, mencegah penurunan tekanan batuan yang terlalu cepat, dan mencegah polusi panas dan polusi kimia pada lingkungan yang disebabkan oleh kandungan kimia tertentu pada brine. Pada pipa aliran brine terjadi penurunan tekanan fluida sepanjang aliran. Di lapangan panas bumi Dieng, konsentrasi silika sangat tinggi, sehingga penurunan temperatur saturasi memicu desposisi silika. Penurunan tekanan sepanjang pipa aliran brine dari pompa Vertikal Atas (VA) 7 ke pond di pad 29 di lapangan panas bumi Dieng akan menyebabkan penurunan temperatur saturasi, selain juga kehilangan panas secara alami. Perhitungan penurunan tekanan fluida brine berdasarkan perhitungan Harrison-Freeston dan metode dari Zhao, yang dikembangkan dengan algoritma menggunakan Macro Excel. Sehingga dengan memodelkan penurunan tekanan sepanjang pipa alir, dapat dikembangkan untuk perhitungan penurunan temperatur dan pengendapan silika di pipa aliran brine untuk injeksi panas bumi.Brine injection from geothermal production fluids is used to fill reservoir pore rock volumes, preventing rapid rock pressure drops, and preventing heat pollution and chemical pollution in the environment caused by certain chemical constituents in the brine. Decrease fluid pressure along the flow on the brine flow pipe. In the Dieng geothermal field, the silica concentration is very high, so the decrease in saturation temperature triggers the silica desposition. The pressure drop along the brine flow pipe from the Upper Vertical (VA) 7 pump to the pond in pad 29 in Dieng geothermal field will cause a decrease in saturation temperature, as well as natural heat loss. The calculation of the decrease in brine fluid pressure based on Harrison-Freeston calculations and methods of Zhao, developed with algorithms using Macro Excel. By modeling the pressure drop along the flow line, it can be developed for the calculation of temperature drop and deposition of silica in the brine flow pipe for geothermal injection
Analisa Geokimia Fluida Manifestasi Permukaan di Daerah Panas Bumi Lahendong Jeferson Polii; Alfrie Musa Rampengan
Jurnal Kimia Fullerene Vol 5 No 1 (2020): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.91 KB) | DOI: 10.37033/fjc.v5i1.148

Abstract

Geothermal energy depends on volcanic regions or plate subduction. Indonesia has geothermal potential due to the meeting of 3 (three) large plates. North Sulawesi is one of the areas located in the ring of fire. Some areas in the Minahasa Regency, North Sulawesi province, were targeted for research because they have manifestations of geothermal such as hot pools, steaming ground, mud pools, and other manifestations. The research location is divided into 3 (three) locations around the Lahendong geothermal area, namely the Lahendong pine forest, the Toraget hot air area, and the hot springs in the village of Totolan. The results of sample and ploting tests in ternary diagrams show that all three geothermal manifestations have sulfuric acid type fluids. This type of geothermal fluid has a high SO4 content, while HCO3 and Cl values ​​are low. Hot springs that have a type of sulfuric acid occur in active volcanic regions. This is supported by the lithology of three areas of manifestation which are composed of basalt resulting from volcanic rocks.
Analisis Struktur Kristal Polyetilen Glicol (PEG-4000) Coated Nanopartikel Magnetite (Fe3O4) Alfrie Musa Rampengan; Jeferson Polii
Jurnal Kimia Fullerene Vol 4 No 2 (2019): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.858 KB) | DOI: 10.37033/fjc.v4i2.99

Abstract

The synthesis of materials made from FeSO4.7H2O, FeCl3.6H2O, and NH4OH hydrophilic materials has been carried out using coprecipitation method to produce Fe3O4 nanoparticle material. Analysis of the crystalline structure of Fe3O4 nanoparticles seen from the results of material characterization using X-Ray Diffractometer showed diffraction peaks namely (220) (311) (400) (511) (440) with the main peak at the index (311). Samples of Fe3O4 nanoparticles were modified with PEG-4000 polymer, emerging new diffraction peaks such as peaks with index (111), α- Fe3O4 peaks, γ-FeO (OH) peaks and α-FeO ​​(OH) peaks. The emergence of these new peaks is due to the influence of the PEG-4000 polymer which directly shows the bond with the -OH (hydroxyl) group.
Analisa Sifat Kimia Fisik Fluida dan Perkiraan Temperatur Reservoir Geotermal di Kabupaten Minahasa Selatan Jeferson Polii; Soenandar Milian Tompunu Tengker
Jurnal Kimia Fullerene Vol 7 No 2 (2022): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v7i2.459

Abstract

The presence of geothermal potential in an area is indicated by the presence of surface manifestations such as hot springs, fumaroles, mud pools, steaming ground, warm ground, geysers, silica deposits, and other manifestations. Chemical and physical analysis of these manifestations can explore the value of subsurface characteristics such as reservoir type, temperature and pressure of reservoir rock formations, as well as the chemical properties of the fluid. The South Minahasa Regency which is the target of the research has geothermal manifestations such as hot springs, steaming ground, silica deposits, and others. The study was conducted to analyze the characteristics of the fluid using geochemical methods and to estimate the temperature of the geothermal reservoir in the manifestation area in South Minahasa Regency. Geothermal manifestation in Pinaesaan village, South Minahasa Regency is a type of chloride fluid. This shows that the geothermal area is a high temperature zone and has a high permeability zone. Geothermal fluid in Pinaesaan village, South Minahasa Regency is in the area of ​​partial equilibrium waters, which indicates that the fluid is not in a state of equilibrium. This is because the fluid has been mixed with surface water. The hot springs in Pinaesaan village are estimated to be an outflow zone from the geothermal system in the area. The estimated temperature of the geothermal reservoir in Pinaesaan Village using a silica quartz geothermometer calculation is 191°C.
ANALISIS TIPE FLUIDA MANIFESTASI PANAS BUMI DI DESA KALEOSAN KABUPATEN MINAHASA UTARA Windy Wantalangi; Rolles Nixon Palilingan; Jeferson Polii
Charm Sains: Jurnal Pendidikan Fisika Vol 1 No 3 (2020): OKTOBER
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.062 KB) | DOI: 10.53682/charmsains.v1i3.52

Abstract

Geothermal field exploration and development activities are carried out in an effort to find geothermal resources, prove the existence of the resources and produce and utilize their fluids. Geothermal is a natural resource in the form of hot water or steam that forms in the earth's reservoirs through subsurface water heating by hot rocks. This study aims to determine the type of fluid and reservoir in Kaleosan Village, North Minahasa Regency. Areas that have geothermal potential are marked by the discovery of several geothermal manifestations in the form of hot springs. By using the ternary diagram plot method in the Kaleosan Village area of North Minahasa Regency, it was found that the reservoir in the area was a water-dominated type with an HCO3 content of 204 mg / L, Cl of 479 mg / L, and SO4 of 69 mg / L or based on the percentage of each parameter. has values ranging from HCO3 27%, Cl 64%, and SO4 9% which indicates that chloride(Cl) is the dominant content in the geothermal field.
ANALISIS KEMUNGKINAN TERJADINYA KONDENSASI PADA PIPA ALIR UAP DARI SEPARATOR KE SCRUBBER BERDASARKAN MODEL PENURUNAN TEKANAN PADA PLTP AREA LAHENDONG UNIT 5 & 6 Brenda Bella Gunena; Djeli Alvi Tulandi; Jeferson Polii
Charm Sains: Jurnal Pendidikan Fisika Vol 2 No 1 (2021): FEBRUARI
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (291.286 KB) | DOI: 10.53682/charmsains.v2i1.82

Abstract

Geothermal production in steam turbines must pay attention to the quality of the incoming steam because if their steam is condensed it will affect the effectiveness of the turbine, so the purpose of this study is to examine the possibility of condensation in the pipe steam flow. The method used in this research is descriptive, where each parameter measurement is calculated using Microsoft Office Excel programming steam prog and using the Harrison and Friston equation which calculates per segment of pipe length (3 m) and calculates the vapor fraction (x) and pipe length in a graph which determines the final result of this study. The graph results between the vapor fraction and the length of the pipe show that the vapor fraction value along the steam pipe continues to increase until 0.9997 (99.98%) almost becomes 1 (100%) meaning that there is no condensation in the steam pipe from the separator to the scrubber.
PENGARUH PEMBELAJARAN PROBLEM SOLVING VIRTUAL LABORATORY TERHADAP PENGUASAAN KONSEP FISIKA MAHASISWA PADA MATERI AYUNAN PUNTIR Uranti Amba Lembang; Alfrits Komansilan; Jeferson Polii
Charm Sains: Jurnal Pendidikan Fisika Vol 2 No 3 (2021): OKTOBER
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (114.837 KB) | DOI: 10.53682/charmsains.v2i3.120

Abstract

The laboratory becomes medium for learning science that can make students form knowledge and discover physics concepts from the theory that is being studied. However, learning activities in the laboratory generally make students do what they are told in practicum instructions without understanding what they are doing. The purpose of this study was to determine the effect of Problem Solving Virtual Laboratory learning on students' mastery of physics concepts on the Twist Swing material. This study used a quasi-experimental method with a one-group pretest-posttest design. The sample consisted of 18 students of the 2nd semester of the physics education study program. Based on the n-gain test, 15 students were in the high category with 83% and three students in the medium category with 17%. The statistical hypothesis test using the t-test at the significant level = 0.05, the t value is 2.47, and the t table value is 2.11 so that tcount > ttable. From these results, it can be concluded that problem-solving virtual laboratory learning affects students' mastery of physics concepts on torsional pendulum material.
PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) DENGAN METODE DEMONSTRASI UNTUK MENINGKATKAN HASIL BELAJAR SISWA SMP NEGERI 4 SATAP LIKUPANG BARAT Truly Daniel; Armstrong Sompotan; Jeferson Polii
Charm Sains: Jurnal Pendidikan Fisika Vol 2 No 3 (2021): OKTOBER
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.583 KB) | DOI: 10.53682/charmsains.v2i3.126

Abstract

This study aims to improve student learning outcomes. After following the learning process using the Problem Based Learning (PBL) learning model. This research was conducted at SMP Negeri 4 Satap Likupang Barat for the 2019-2020 academic year. The research method used was classroom action research (CAR) which was conducted in two cycles. Each cycle consists of four stages, namely, planning, implementation, observation and reflection. The subject of this research is class VIII, which consists of 18 students. The research instrument used is questions. KKM achievement has increased, namely the average student learning outcomes in cycle 1 of 55.5%. And increased in cycle 2 to 83.3%. This clearly shows that student learning outcomes have increased from cycle 1 to cycle 2. Thus, cycle 2 has met the indicators of achievement of results.
Pengembangan Modul Praktikum Deviasi Dan Indeks Bias Prisma Berbasis Laboratorium Virtual Olivia Betricha Gare; Jimmy Lolowang; Jeferson Polii
Charm Sains: Jurnal Pendidikan Fisika Vol 3 No 1 (2022): FEBRUARI
Publisher : Program Studi Pendidikan Fisika Jurusan Fisika Fakultas Matematika, Ilmu Pengetahuan Alam, dan Kebumian (FMIPAK), Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.1 KB) | DOI: 10.53682/charmsains.v3i1.150

Abstract

Research is motivated by the lack of a virtual lab-based deviation and refractive index practicum module, so students are less experienced in using these tools while experimenting. This purpose of this research is to create a virtual lab-based module for prismatic deviation and refractive index. This research is developmental (Research and Development) using a 4D research model adopted from Thiagarajan model i.e. define, design, develop, and disseminate. The result of the group research receive an average value of 83.19%, so that the module is classified in the feasible/valid category. And in the student responses 58.35% said it was very useful (SB), 39.6% said it was useful(B), and 2.05% said it was less useful(KB), no one chose not useful(TB). Based on the result of the research, it can be concluded that a product in the form of a basic physics practicum module for the virtual laboratory-based prism deviation and refractive index tool was manufactured with good and appropriate qualifications.
ANALISA KINERJA DEMISTER SELAMA TAHUN 2019 DI PLTP LAHENDONG Gisella Gabriella Tangkere; Rolles Nixon Palilingan; Jeferson Polii
Jurnal FisTa : Fisika dan Terapannya Vol 2 No 1 (2021): APRIL
Publisher : Fakultas Matematika Ilmu Pengetahuan Alam dan Kebumian, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53682/fista.v2i1.101

Abstract

Geothermal is now widely used by several developed countries, there are very many roles of geothermal energy sources, it is necessary to use one of them by utilizing geothermal heat energy itself into electrical energy. In chemical process industry there are a number of processes where a gas and a liquid come into contact with each other and whenever this happens, the gas will introduce a number of liquid particles. This liquid phase carried over to the gas phase can cause a number of problems such as equipment breakdown, process inefficiency etc, and need to be eliminated. Equipment used to remove entrainment is known as a Demister. This study aims to calculate Demister Efficiency throughout 2019 at PLTP Lahendong. Research conducted is to collect data at the Lahendong Geothermal Power Plant Unit-2 and this research uses data processing methods that use applications, namely steam tables and Microsoft Excel. Demister's performance in 2019 for 3 months got 88.90% J results which were influenced by heat loss, pressure and inner diameter, from results obtained after processing it can be concluded that the higher the heat loss value, better the efficiency value, Explains that performance Demister arguably had no problems in a year.
Co-Authors Alfrie Musa Rampengan Alfrits Komansilan Angely Syuly Ratag Armando Ariakta Aloanis Armstrong F. Sompotan Aslam Rais Brenda Bella Gunena Cyrke A N Bujung Djeli Alvi Tulandi Farly Reynol Tumimomor Gisella Gabriella Tangkere Heindrich Taunaumang Heindrich Taunaumang Heinrich Taunaumang Jimmy Lolowang Marcelino Datunsolang Musa Salvador Arikalang Olivia Betricha Gare Priskilla Wulandari Polimpung Ravael Ratumbuysang Rigitha Petrisia Raco Rolles Nixon Palilingan Rolles Nixon Palilingan Tengker, Soenandar Millian Tompunu Tesalonika Lontoh Truly Daniel Uranti Amba Lembang Windy Wantalangi