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All Journal Indonesian Journal of Geography POSITRON Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Journal of ICT Research and Applications Jurnal Fisika Unand JOURNAL ONLINE OF PHYSICS Science and Technology Indonesia JOIV : International Journal on Informatics Visualization Journal of Science and Applicative Technology Jurnal Penelitian Pendidikan IPA (JPPIPA) Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Jurnal Sains Dirgantara Jurnal Review Pendidikan dan Pengajaran (JRPP) Jurnal Geofisika Jurnal Jaring SainTek Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Phydagogic : Jurnal Fisika dan Pembelajarannya Indonesian Journal of Physics (IJP) Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) Journal of Engineering and Technological Sciences

Wahyu Srigutomo

Department of Physics, Faculty of Mathematics and Fundamental Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, 40132, Indonesia

Author-ID : 444889

Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

Published : 47 Documents Claim Missing Document

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Articles

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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.

Two-Dimensional Steady Flow Modeling of Ideal Fluid in Porous Medium Using Finite Element Method Hairil Anwar; Wahyu Srigutomo
Indonesian Journal of Physics Vol 26 No 1 (2015): Vol. 26 No. 1, July 2015
Publisher : Institut Teknologi Bandung

Ideal fluid is a fluid which is uncompressed and has no viscosity. A steady stream of ideal fluid in a porous medium can be modeled using finite element method. The finite element method is a numerical method that can be used to solve boundary-value problem governed by a differential equation and a set of boundary conditions. In this modeling, the linear system of equations derived using Galerkin approach for linear triangular elements. Irregular geometry and variation in permeability distribution models are used. The solution obtained in form of fluid head and fluid flow velocity distribution in the modeling domain.

2-Dimensional Pressure Distribution in Saturated Petroleum Reservoir using Finite Difference Adam Sukma Putra; Wahyu Srigutomo
Indonesian Journal of Physics Vol 27 No 1 (2016): Vol 27 No 1 (2016), July 2016
Publisher : Institut Teknologi Bandung

The aim of this project is to solve the Darcy’s Equation using the finite difference (FD) method. We test the governing equation by investigating a saturated petroleum reservoir in two-dimensional (2-D) system to describe the distribution of the pressure within the reservoir. We assume that the velocity of the fluid (oil) is incompressible and relatively slow as a consequence that the system is saturated. The model used is a flow in steady state 2-D porous media. We apply the modified form of FN method with Gauss-Seidel to improve the precision of the simulation.

An Application of Inversion Technique to 1-Dimensional Gravity Data in Bayesian Framework using Monte Carlo, Metropolis, and Simulated Annealing Algorithm Adam Sukma Putra; Wahyu Srigutomo; Yuant Tiandho; Herlin Tarigan; Yanti Yanti
Indonesian Journal of Physics Vol 30 No 1 (2019): Vol 30 No 1 (2019)
Publisher : Institut Teknologi Bandung

The purpose of this paper is to present a simulation to the inversion methods applied to geophysical exploration. Anapplication of Monte-Carlo, Metropolis, and Simulated Annealing techniques to 1-Dimensional gravity inversion inBayesian framework has been studied. Differences between these methods are observed in both single parameterinversion and simultaneous multi parameter inversion. After selecting the best inversion strategy from the three methods,a further investigation was investigated. Multi parameter inversion for two anomalies is simultaneously carried out andresults are observed. The synthetical data of GRAV2DC free source were used instead of observed data.

Acoustic CO2 Gas Sensor Based on Phase Difference Measurement Melany Febrina; Eko Satria; Mitra Djamal; Wahyu Srigutomo; Martin Liess
Journal of Science and Applicative Technology Vol 5 No 2 (2021): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i2.680

In this research, an acoustic sensor has been successfully built to measure the concentration of CO2 gas in a mixture of gases (N2 and CO2). The nitrogen and carbon dioxide gases used are ultra-high purity (UHP) gas. The measurement parameter used is the speed of sound by utilizing the phase shift between ultrasonic wave signals that are sent and received continuously. The acoustic method in this research is by using the speaker as an ultrasonic wave transmitter, and the microphone as an ultrasonic wave receiver emitted by the speaker on the gas medium. This acoustic phase shift method is very sensitive to be used to determine the speed of sound on a gas medium. From the sensor testing, the sensor has good linearity in detecting changes in CO2 concentration in the gas mixture. The sensor test results have been validated theoretically and obtained an RMS error of 3.36 (3.36% with a maximum concentration of 100%), this proves that the work of the sensor is in accordance with the theory. In addition to theoretical validation, the work of the sensor has also been validated by looking at the direct relationship between sensor input and output through the inverse function, and an RMS error of 3.51 (3.51% with a maximum concentration of 100%) is obtained. From the overall results obtained, the acoustic CO2 gas sensor that is built can detect changes in CO2 concentrations in the gas mixture accurately, fabrication of the sensor is easy to do, and the costs required in the manufacturing process are cheap.

Aplikasi Transformasi Reduction to Pole (RTP) Menggunakan Matlab dalam Pengolahan Data Magnetik WDMAM pada Wilayah Tapal Kuda -Jawa Timur Supriyadi; Enjang Jaenal Mustopa; Wahyu Srigutomo
Jurnal Jaring SainTek Vol. 5 No. 1 (2023): April 2023
Publisher : Fakultas Teknik, Universitas Bhayangkara Jakarta Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31599/jaringsaintek.v5i1.1761

Dalam metode magnetik, medan magnet anomali disebabkan oleh sumber medan magnet dipol. Setiap tempat memiliki sudut iklinasi dan deklinasi magnetik yang berbeda sehingga menyebabkan peta anomali magnetik bersifat kompleks dan interpretasinya menjadi relatif sulit. Untuk mengatasi kerumitan dalam interpretasi data magnetik, penggunaan transformasi reduksi ke kutub RTP sangat penting dilakukan. Tapis RTP dengan memanfaatkan fungsi-fungsi built in Matlab telah berhasil direalisasikan dan diaplikasikan pada data magnetik WDMAM wilayah Tapal Kuda-Jawa Timur. Nilai sudut inklinasi I = -32.82° dan sudut deklinasi D = 0.72° digunakan pada aplikasi RTP daerah ini. Anomali magnetik hasil RTP menunjukkan bahwa terjadi perubahan rentang nilai medan magnet yaitu dari -345.51 nT s.d 282.30 nT menjadi -975.37 nT s.d 782.38 nT. Selain itu, terjadi pergeseran lokasi klosur anomali magnetik positif dan negatif. Anomali magnetik positif mendominasi di bagian tengah sampai utara Wilayah Tapal Kuda dan diduga berkaitan dengan Zona Vulkanik Kuarter. Klosur-klosur anomali positif mengalami pergeseran letak ke barat di sekitar Gunung Bromo dan Gunung Argopuro. Anomali magnetik negatif mendominasi tepi selatan Wilayah Tapal Kuda dan diduga berkaitan dengan Zona Pegunungan Selatan. Klosur anomali negatif juga mengalami pergeseran letak yaitu ke barat daya mendekati gunung Semeru.

PEMODELAN SUMBER TEKANAN GUNUNG SINABUNG MENGGUNAKAN SKEMA INVERSI PARTICLE SWARM OPTIMIZATION (PSO) Ratih Kumalasari; Wahyu Srigutomo; Irwan Meilano; Hendra Gunawan
JOURNAL ONLINE OF PHYSICS Vol. 8 No. 3 (2023): JOP (Journal Online of Physics) Vol 8 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v8i3.27099

Gunung Sinabung merupakan salah satu gunung aktif diindonesia yang masuk dalam gunungapi tipe A setelah erupsi pertama kali pada tahun 2010 setelah sebelumnya tidak ada aktivitas erupsi. Gunung sinabung terus erupsi hingga saat ini yang mejadikan Gunung Sinabung perlu diamati lebih lanjut terkait aktivitas yang terjadi serta dilakukan pemodelan untuk memprediksi kondisi bawah permukaan yang dapat membantu proses analisis. Pemodelan terhadap data permukaan Gunung Sinabung yang berasal dari data pergeseran permukaan dari GPS pada tahun 2015-2016 telah dimodelkan dengan skema inversi particle swarn optimization (PSO). Erupsi yang terus menerus pada tahun tersbut menghasilkan data yang sangat fluktuatif dengan hasil inversi menunjukan bahwa sumber tekanan pada tekanan pada Gunung Sinabung terletak pada kedalaman dangkal yaitu 0,5km hingga 1,0 km dibawah permukaan laut dibawah Gunung Sinabung, dengan sumber tekanan yang dangkal serta adanya inflasi pada tubuh gunung api maka memungkinkan adanya erupsi secara kontiyu dalam waktu yang singkat

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.

Land Suitability and Plant Types Based on Soil Electrical Properties and Remote Sensing Eleonora Agustine; Nadhira Gunawan; Rifky Nauval; Muhammad Abdilllah Budianto; Irwan Ary Darmawan; Dini Fitriani; Kartika Hajar Kirana; Wahyu Srigutomo; Asep Harja; Imran Hilman Mohammad; Eddy Supriyana
Jurnal Geologi dan Sumberdaya Mineral Vol. 24 No. 2 (2023): JURNAL GEOLOGI DAN SUMBERDAYA MINERAL
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v24i2.723

Regional development in Panimbang District, Banten Province, Indonesia, is executed so that the tourism area is not centered solely on the west coast of Pandeglang but also in the surrounding area. The development is carried out in stages from government offices, education facilities, and public facilities. One of the public facilities to be built is a garden. This study aimed to evaluate the condition of the soil layers and fertility for garden construction. The resistivity method determines the soil layer pattern using dipole configuration. Remote sensing methods are used to assess land suitability and soil fertility. Land suitability based on agro-climatic data soil fertility based on physical and chemical parameters is taken from SoilGrids 250 m. The results of the resistivity method showed various values between 1 – 110 Ωm, and there are three layers of soil up to a depth of 3.58 m The first layer is assumed to be silty clay (15 – 30 Ωm), the second layer is assumed to be clay (1 – 5 Ωm), and the third layer is assumed to be silty and sandy soil (70 – 110 Ωm). Based on the remote sensing data, the first layer had an ideal bulk density and cation exchange value, but the pH value and nitrogen content are less ideal. The second layer had an ideal value of cation exchange capacity and pH, a rather ideal bulk density value, and a low nitrogen content and is considered a fertile layer of soil. Keywords: Remote sensing, resistivity, soil fertility, soil layers, SoilGrids 250 m

Convolutional Neural Networks-Based For Predicting Aerodynamic Coefficient Of Airfoils At Ultra-Low Reynolds Number Alief Sadlie Kasman; Arizal Akbar Zikri; Fariduzzaman Fariduzzaman; Wahyu Srigutomo
JOIV : International Journal on Informatics Visualization Vol 8, No 1 (2024)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.8.1.2197

Many applications, including airplane design, wind turbines, and heat transmission, use symmetric or asymmetric airfoils. Engineers employ these airfoil shapes to optimize performance and efficiency. Each airfoil has a unique set of aerodynamic coefficients that must be calculated to maximize the airfoil design. Engineers utilize numerous ways to calculate coefficients, such as lift and drag. One of the methods is the prediction method, which effectively reduces time and cost. This study's training dataset is obtained from particle-based numerical computation using the Lattice Boltzmann Method (LBM). Then, Convolutional Neural Networks (CNN) are used as a prediction method to get the aerodynamic coefficients of airfoils for lift and drag based on two different Reynolds numbers. In CNN, airfoil geometry representation is essential. The Signed Distance Function (SDF) was used to convert airfoil geometry into RGB pictures. On the other hand, the SDF method cannot explain different flow conditions; in this case, it is represented by the Reynolds number (Re). Therefore, we propose a Text-based Watermarking Method (TWM) to differentiate between Re = 500 and Re = 1000. Each airfoil representation was trained and tested to generate each prediction model using a modified LeNet-5. The computation results show that using CNN with TWM on SDF to define the Reynolds numbers could predict the lift and drag coefficients with varying angles of attack. Future research can focus on generalizations to different aerodynamic aspects and practical applications in complex scenarios.

Co-Authors Abdullah, Adi Rahmansyah Amir Acep Purqon Acep Purqon Adam Sukma Putra Adhitya S. Sunarya Adi R.A. Abdullah Alamta Singarimbun Alan Maulana Alan Maulana Alief Sadlie Kasman Anggie Susilawati Anwar, Hairil Ari Setiawan Arizal Akbar Zikri Asep Harja Asep Harja Asep Saefullah Azrul Azwar Bakrun Bakrun Candra E. Novana Deny Juanda Puradimaja Dini Andriani Dini Fitriani Doddy Sutarno Doddy Sutarno Doddy Sutarno Doddy Sutarno Doddy Sutarno Doddy Sutarno Eddy Supriyana Eleonora Agustine Eleonora Agustine Eleonora Agustine Eleonora Agustine Enjang Jaenal Mustopa Enjang Jaenal Mustopa Enjang Jaenal Mustopa Fajriani Fajriani Fajriani Fajriani Fariduzzaman Fariduzzaman Fourier Dzar Eljabbar Latief Frafti Rejeki Fungki Iqlima Nasyidiyah Ghany Hanifan Muslim Hairil Anwar Hairil Anwar Hairil Anwar Halawa Ernwati Hapsoro, Cahyo Aji Harapan Marpaung Hardi Hamzah Harry Mahardika Haryo Seno Hendra Gunawan Herlan Darmawan Herlin Tarigan Hisashi Utada Humolungo, Ismail Husnul Hamdi Husnul Hamdi, Husnul I G. P. F. Soerya Djaja I Gede Putu Fadjar Soerya Djaja Imam Suyanto Imran Hilman Mohammad Imran Hilman Mohammad Irwan Ary Darmawan irwan meilano Irzaman, Irzaman Ismail Humolungo Jayawarsa, A.A. Ketut Joko Sampurno Kartika Hajar Kirana Kumalasari, Ratih Kuncoro, Alvina Kusumadewi Linus Pasasa M. Habri Zen Mahardika, Harry Maria Evita Martin Liess Martin Liess Melany Febrina Mitra Djamal Moh Yasin Mohammad Heriyanto Mohammad Heriyanto Muhamad Hilmi Aufa Muhammad Abdilllah Budianto Nadhira Gunawan Ni Ketut Lasmia Nina Siti Aminah Pepen Supendi Pratomo, Prihamdhanu Mukti Prihamdhanu Mukti Pratomo Prihandhanu M. Pratomo Purnama, Dikdik Sidik Putra, Heriansyah Rahmi Elzufiah Rakotovao Lovanantenaina Omega Rasito Tursinah, Rasito RATIH KUMALASARI Ratih Kumalasari Retna Apsari Richardo Barry Astro Rifky Nauval Rostikwati, Diana Ayu Ruddy Kurnia Satria, Eko Seno, Haryo Sesri Santurima Setyanto Cahyo Pranoto Sidik, Adi Permana Sitti Balkis Sparisoma Viridi Sumintadireja, Prihadi Suprijadi Suprijadi Suprijadi Suprijadi Supriyadi Supriyadi Surya Ningsih Surya Ningsih Suryanto, Wiwit Tsuneomi Kagiyama Tsuneomi Kagiyama Tsuneomi Kagiyama Umar Fauzi UMAR FAUZI Umar Said Wahyu Hidayat Wahyudi Wahyudi Warsa warsa Wataru Kanda Yanti Yanti Yazid Bindar Yuant Tiandho Zulfahmi Zulfahmi Zulfahmi Zulfahmi Zulhendra Zulhendra

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