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All Journal Bionatura Jurnal Matematika & Sains Journal of Engineering and Technological Sciences JOURNAL ONLINE OF PHYSICS Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Jurnal Review Pendidikan dan Pengajaran (JRPP) Jurnal Riset Fisika Indonesia Indonesian Journal of Physics (IJP) Jurnal FisTa : Fisika dan Terapannya

Alamta Singarimbun

Institut Teknologi Bandung

Author-ID : 3243237

Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Self Potential Modeling for Investigation of Shallow Structure in Volcanic Region: a Study Case at Domas Crater, Tangkuban Parahu Volcano, West Java Wahyu Srigutomo; Alamta Singarimbun; Adhitya S. Sunarya; Prihandhanu M. Pratomo; Anggie Susilawati; Candra E. Novana; Deny Juanda Puradimaja; Eleonora Agustine
Indonesian Journal of Physics Vol 21 No 2 (2010): Vol. 21 No. 2, April 2010
Publisher : Institut Teknologi Bandung

Quantitative numerical modeling of self-potential (SP) anomaly associated with subsurface electric current density that is attributed to cross-coupling between fluid flow and electrical conductivity distributions has been conducted. The modeling scheme was applied to an area in the vicinity area of Domas crater, Tangkuban Parahu volcano in West Java. The field surveys at domas were conducted from mid-2008 until mid-2009. The main objective of this researchis to obtain a quantitative model that is possible to explain the shallow convective hydrothermal system in the eastern side of the volcano by making comparison between SP anomaly measured on the surface with theoretical anomaly resulted from modeling. Since the modeling scheme requires information on the subsurface resistivity structure, we performed measurement and interpretation of 2-D resistivity at Domas crater. The measurement of CO2 emission that is commonly associated with magmatic gas migration patterns through fracture system was also carried out on the same SP and resistivity lines. Fluid velocity vector was calculated by solving the coupled Darcy’s and energy equations involving heat transfer terms by both convection and conduction. The subsurface electric current source distribution was calculated by solving the coupled equation of velocity and potential gradients. The results show that the fluid flow patterns around Domas Crater which in addition is controlled by topographic effect; it is also influenced by thermal fluid flows through relatively high permeability zone beneath the Domas Crater.

A Numerical Modeling of Formation of Volcanic Geothermal Reservoir Alamta Singarimbun
Indonesian Journal of Physics Vol 21 No 3 (2010): Vol. 21 No. 3, July 2010
Publisher : Institut Teknologi Bandung

The aim of the research is to develope the thermal energy from volcanic geothermal reservoir. One of the prospec of the geothermal energy for the future is the utilization of volcanic geothermal reservoir. The using of numerica simulation is important to clarify the thermal processes in a fluid reservoir beneath an active volcano. The fluid reservoir is a permeable zone, where the magmatic water discharged from magma mixes with the downgoing meteoric water. The flow rate of magmatic water becomes the mass and energy input to the reservoir. Finally, the fluid go to the earth’s surface as vapor and liquid. The main physical parameters of the fluid reservoir cover pressure, temperature, enthalpy and enthalpy. The Finite Difference Method based on mass and heat balance equations is used to obtain these parameters. The parameters reperesent the thermal state of the fluid in the reservoir. The fluid phase in the reservoir changes with time. These processes interpret the development of the energy in a geothermal reservoir.

One Dimension Spring Supported Ball on Top of a Sinusoidal Vibrating Plate: A Forced Oscillation Simulation using Molecular Dynamics Method Sparisoma Viridi; Wahyu Srigutomo; Alamta Singarimbun; Wahyu Hidayat; Sitti Balkis
Indonesian Journal of Physics Vol 22 No 2 (2011): Vol. 22 No. 2, April 2011
Publisher : Institut Teknologi Bandung

A ball supported by a spring is set on top of a plate which is sinusoidal vibrated. The motion is limited to one dimension motion. It is assumed that the spring is an ideal one with zero mass. The vibrating plate is considered much heavier than the ball, so that the ball motion has no influence on the plate motion. Plate vibration frequency is varied around the frequency of ball-spring system. Resonance phenomenon is reported, which needs a phase match condition to occur.

Aplikasi Metode Volumetrik dalam Estimasi Potensi Panas Bumi Berdasarkan Parameter Fisis Reservoir (Studi Kasus Daerah Panas Bumi “Z”) Latifah Nurul Qomariyatuzzamzami; Zuhdiyah Matienatul Iemaaniah; Alamta Singarimbun
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 9, No 2 (2023)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30870/gravity.v9i2.20474

Geothermal is a renewable energy strategically developed in Indonesia, but its utilization has not been maximized. Geothermal exploration requires high costs, so estimating energy reserves in potential areas is essential. This study was conducted to determine the electrical energy potential of geothermal area "Z" by volumetric method and determine the influence of saturation, porosity, and length of generation time on the potential of geothermal electrical energy. The volumetric method used is the lumped parameter model. The calculation was carried out with variations in water saturation 0% - 80%, rock porosity 10% - 40%, and the length of generation time 25 - 40 years. The highest estimated electrical energy of geothermal area "Z" is 188 MWe obtained at 80% water saturation, 10% porosity, and 25 years generation duration, while the lowest is 80 MWe obtained with 0% water saturation, 40% porosity, and 40 years of generation duration. At the same porosity, the greater the water saturation, the greater the value of geothermal electricity reserves of the area "Z." The greater the porosity, the greater the effect of increasing water saturation on increasing electrical energy reserves. The large porosity of rocks causes their energy to be smaller since the heat dominance of geothermal regions "Z" is given by the heat of rocks. The length of generation time affects the amount of geothermal electrical energy, that is, the longer the production time, the smaller the reserve.

SIMULASI ALIRAN KONVEKSI FLUIDA DI DAERAH RESERVOIR PANAS BUMI Alamta Singarimbun; Famelia Nurlela
Jurnal FisTa : Fisika dan Terapannya Vol 1 No 1 (2020): 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.v1i1.59

The potential of geothermal energy can be determined by the potential classification based on performed simulation. The simulation results show the quality of geothermal energy utilization can be optimized. Under natural conditions, a geothermal system consists of a heat source, the bedrock layer, reservoir layer, and caprock layers. The process of conduction heat transfer occurs when a heat source to transfer heat to the bedrock and bedrock is heat transfer by convection to the reservoir. The heat transfer process makes the temperature at any depth is different and will change with time. Numerical simulation and modeling of two-dimensional sebara done to simulate the fluid temperature in the geothermal reservoir which satisfies equations of fluid flow in a porous medium for single-phase flow (Darcy's law). The observed parameters are the temperature distribution, pressure, and direction of fluid flow in a reservoir. Didiskritisasi mathematical equations using finite difference or difference-up. The computational process is done by using Matlab software

INOVASI PENERANGAN: LILIN SEBAGAI ALTERNATIF ENERGI LISTRIK BERBASIS TERMOELEKTRIK. SEBUAH KAJIAN EKSPERIMENTAL Harapan Marpaung; Mitra Djamal; Linus Pasasa; Alamta Singarimbun; Wahyu Srigutomo; Ni Ketut Lasmia
Jurnal Review Pendidikan dan Pengajaran (JRPP) Vol. 6 No. 4 (2023): Volume 6 No 4 Tahun 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrpp.v6i4.22628

Teknologi pembangkit listrik berbasis termoelektrik (Thermoelectric Generator /TEG) adalah salah satu metode konversi energi panas menjadi energi listrik secara langsung jika terjadi perbedaan suhu antara sisi panas Th dan sisi dingin Tc antara kedua sisi TEG. Salah satu penyebab perkembangan teknologi termoelektrik belum menggembirakan, karena efisiensi TEG yang tersedia saat ini secara komersil masih relatip rendah, umumnya masih berkisar antara 4 % hingga 5%, dan efisiensinya akan masih berkurang jika sudah menghasilkan listrik. Pemanfaatan teknologi ini masih terbatas pada suhu tinggi (>200 °C) sedangkan untuk suhu rendah (<150 °C) belum banyak menarik minat para peneliti. Karakteristik termoelektrik yang khas yakni sekecil apapun beda suhu antara sisi panas dan sisi dingin pasti akan menghasilkan energi listrik dan dalam penelitian ini akan dikembangkan suatu perangkat yang dapat menghasilkan energi listrik hingga 1 watt dengan sumber panas dari lilin. Pada eksperimen ini akan dikaji bahwa lilin dapat menjadi sumber energi listrik berbasis termoelektrik untuk penerangan masa depan. Tipe termoelektrik yang digunakan pada eksperimen ini adalah TEC1-12706, SP1848 dan TEG1-241-01.4-1.2.

Co-Authors Adhitya S. Sunarya Adjat Sudradjat - Agus Syihabudin Amiruddin Takda Anggie Susilawati Asep Wawan Jatnika Bakrun Bakrun Candra E. Novana Cyrke A N Bujung Deny Juanda Puradimaja Dicky Muslim Dini Andriani Eddy Zulkarnaini Gaffar Eleonora Agustine Eleonora Agustine Famelia Nurlela Fatihin, Riva Choerul Febri Hirnawan - Gaffar, Eddy Zulkarnaini Gilang Satria Prayoga Harapan Marpaung Harry Mahardika I G. P. F. Soerya Djaja Latifah Nurul Qomariyatuzzamzami Linda Handayani Linus Pasasa Maya Efiarni Eka Putri Mitra Djamal Ni Ketut Lasmia Panji Tofani Pepen Supendi Prihandhanu M. Pratomo Richardo Barry Astro Shohib Khoiri Siregar, Rahmat Nawi Sitti Balkis Sparisoma Viridi Tofani, Panji Tutuka Ariadji Umar Fauzi Umar Said Wahyu Hidayat Wahyu Srigutomo Wahyu Srigutomo Zuhdiyah Matienatul Iemaaniah

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