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All Journal Jurnal Matematika & Sains Journal of Engineering and Technological Sciences JPSE (Journal of Physical Science and Engineering) Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Pendidikan : Riset dan Konseptual Spektra: Jurnal Fisika dan Aplikasinya Dinamisia: Jurnal Pengabdian Kepada Masyarakat WIDYA LAKSANA Jurnal Geofisika Jurnal Graha Pengabdian GEMBIRA (Pengabdian Kepada Masyarakat)
Hapsoro, Cahyo Aji
Universitas Negeri Malang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Pemodelan Aliran Fluida 2-D Pada Kasus Aliran Permukaan Menggunakan Metode Beda Hingga Hapsoro, Cahyo Aji; Srigutomo, Wahyu
Jurnal Matematika dan Sains Vol 18 No 3 (2013)
Publisher : Institut Teknologi Bandung

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Abstract

Persamaan dasar aliran fluida yang disebut persamaan Navier-Stokes merupakan persamaan diferensial parsial non linier yang kompleks. Untuk menyelesaikan dan memodelkan aliran fluida perlu dilakukan pendekatan numerik, salah satunya dengan metode beda hingga. Penyelesaian persamaan Navier-Stokes dilakukan dengan meninjau beberapa asumsi penyederhanaan yaitu: fluida bersifat tak termampatkan, parameter aliran bergantung pada arah spasial x dan y, serta semua variabel dianggap sebagai fungsi periodik. Pemodelan numerik dilakukan untuk menghitung ketidakstabilan Kelvin-Helmholtz lapisan campuran, evolusi struktur vorteks dan dipol vorteks. Ketidakstabilan Kelvin-Helmholtz divariasikan dengan nilai panjang gelombang gangguan sebesar l = 0.5Lx  dan l = 0.25Lx. Bilangan Reynolds (Re) divariasikan dengan nilai 1000, 3000, dan 5000. Hasil pemodelan menunjukkan bahwa untuk ketiga Re tersebut, aliran fluida bersifat laminar, kritis, dan turbulen. Hal ini terindikasi oleh arah medan vortisitas serta distribusi massa jenis fluida. Semakin besar kecepatan aliran maka sifat aliran akan menjadi semakin acak atau turbulen. Kata kunci: Aliran fluida, Persamaan Navier-Stokes, Bilangan Reynolds, Vortisitas, Ketidakstabilan Kelvin-Helmholtz.   2-D Fluid Surface Flow Modeling using Finite-Difference Method Abstract Navier-Stokes equation is a complex non-linear second-order partial differential equation describing a fluid flow. Solving and modeling the fluid flow, a numerical method called finite difference method is frequently used. Several assumptions are incorporated in solving numerically Navier-Stokes equation: the fluid is incompressible, fluid flow parameters depend on its positions, and all variables are considered as periodic functions. In this paper numerical calculation has been carried out to model the Kelvin-Helmholtz instability of mixed layer, evolution of vortex structure and vortex dipole. The calculation is done by varying perturbation wavelength l = 0.5Lx  and l = 0.25Lx. Reynolds number (Re) is varied at 1000, 3000, and 5000. The results show that for the three values of Re, the properties of the flows are laminar, critical, and turbulent, respectively as indicated by the vorticity direction and distribution of fluid density. The larger value of fluid velocity, the more random and turbulent the fluid is. Keywords: Fluid flow, Navier-Stokes equation, Reynolds number, Vorticity, Kelvin-Helmholtz instability.
Global Inversion of Grounded Electric Source Time-domain Electromagnetic Data Using Particle Swarm Optimization Cahyo Aji Hapsoro; Wahyu Srigutomo; Acep Purqon; Warsa warsa; Doddy Sutarno; Tsuneomi Kagiyama
Journal of Engineering and Technological Sciences Vol. 53 No. 1 (2021)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2021.53.1.1

Abstract

Global optimization inversion of grounded wire time-domain electromagnetic (TDEM) data was implemented through application of the particle swarm optimization (PSO) algorithm. This probabilistic approach is an alternative to the widely used deterministic local-optimization approach. In the PSO algorithm, each particle that constitutes the swarm epitomizes a probable geophysical model comprised by subsurface resistivity values at several layers and layer thicknesses. The forward formulation of the TDEM problem for calculating the vertical component of the induced magnetic field is first expressed in the Laplace domain. Transformation of the magnetic field from the Laplace domain into the time domain is performed by applying the Gaver-Stehfest numerical method. The implementation of PSO inversion to the TDEM problem is straightforward. It only requires adjustment of a few inversion parameters such as inertia, acceleration coefficients and numbers of iteration and particles. The PSO inversion scheme was tested on synthetic noise-free data and noisy synthetic data as well as to field data recorded in a volcanic-geothermal area. The results suggest that the PSO inversion scheme can effectively solve the TDEM 1D stratified earth problem. 
Implementation of Two-point Quadrature Gauss-Legendre Method on 2D Gravity Anomaly Modeling in Basins with Density Distribution Varied Polynomially as a Function of Depth Wahyu Srigutomo; Sesri Santurima; Cahyo Aji Hapsoro; Hairil Anwar; I Gede Putu Fadjar Soerya Djaja
Jurnal Geofisika Vol 16 No 2 (2018): Jurnal Geofisika
Publisher : Himpunan Ahli Geofisika Indonesia (HAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (934.541 KB) | DOI: 10.36435/jgf.v16i2.51

Abstract

Study of basin geometry basin is important in geosciences and geophysical exploration. Gravity method can be used to address this issue by measuring gravity anomalies on the surface caused by density contrast between the bedrock and the sediment that fills the basin, geometry of the basin and surface topography. Numerically, gravity anomaly modeling can be conducted using two-point rule Gauss-Legendre Quadrature method, for a case where density contrast varies with depth exponentially. Within the scope of this study, gravity anomalies on the surface are significantly affected by the geometry of the curvature of the bedrock as well as the topographic elevation of the surface and the selected density contrast, and are not significantly affected by the undulation of the bedrock curvature.
Dissemination of the Existence of the Cave as a Geotourism and Science Study Center Siti Zulaikah; Hari Wisodo; Yoyok Adisetyo Laksono; Cahyo Aji Hapsoro; Hamdi Rifai; Ferdinal Ferdinal; Dini Fitriani; Anis Nurullaili; Muhammad Fathur Rouf Hasan
Dinamisia : Jurnal Pengabdian Kepada Masyarakat Vol. 7 No. 1 (2023): Dinamisia: Jurnal Pengabdian Kepada Masyarakat
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/dinamisia.v7i1.12407

Abstract

Keberadaan gua umumnya hanya dimanfaatkan sebagai tempat wisata biasa atau bahkan belum dikembangkan menjadi obyek wisata. Dalam kajian ini, keberadaan gua tidak hanya dikembangkan sebagai tempat wisata biasa, namun dimanfaatkan sebagai wisata edukasi dan Pusat Kajian Ilmu Pengetahuan. Kegiatan ini bertujuan untuk sosialisasi pengembangan fungsi Gua Lowo, Watulimo, Trenggalek sebagai Pusat Kajian Ilmu Pengetahuan. Metode yang digunakan yaitu sosialisasi yang bekerjasama dengan mitra Pemda Kecamatan Watulimo, Trenggalek yang diikuti oleh 30 peserta. Proses evaluasi dilakukan dengan instrumen kuisioner dan Focus Group Discussion. Kegiatan dalam pengabdian masyarakat ini meliputi: pembuatan poster, buku perfectus, serta video yang berisi hasil penelitian sebelumnya, seperti peran gua dalam merekam perubahan iklim dan lingkungan dimasa lampau, perubahan arah medan magnet bumi, serta kejadian gempa dimasa lampau. Hasil kuesioner menunjukkan rata-rata 90% persen responden menyatakan sangat setuju karena mendapatkan pengetahuan baru, sehingga perlu mendapatkan pelatihan lanjutan untuk pemandu wisata profesional. Hasil pengabdian masyarakat ini dapat digunakan sebagai role model bagi pengembangan wisata gua di Indonesia.
Pengembangan Wisata Ambya’an dengan Pembangunan Taman Sebagai Daya Tarik Wisatawan Muhammad Reyza Arief Taqwa; Muhammad Ibnu Shodiqin; Joko Utomo; Cahyo Aji Hapsoro
Jurnal Gembira: Pengabdian Kepada Masyarakat Vol 1 No 1 (2023): Februari 2023
Publisher : Media Inovasi Pendidikan dan Publikasi

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Abstract

Desa Jambuwer Kecamatan Kromengan merupakan salah satu desa yang sedang berusaha untuk menjadi desa wisata. Potensi yang dimiliki desa jambuwer yaitu wisata edukasi jowaran dan wisata air ambya’an. Untuk wisata Ambya’an sendiri memiliki beberapa aspek yang dapat dikembangkan. Hasil identifikasi masalah dan analisis kebutuhan yang dilakukan oleh tim pengabdian kepada masyarakat menunjukkan bahwa wisata Ambya’an Desa Jambuwer membutuhkan beberapa pengembangan, terutama pengembangan taman. Berdasarkan hasil koordinasi dengan tim pengelola wisata, tim pengabdian masyarakat berhasil membantu pengembangan taman. Beberapa pengembangan kedepan yang dapat dilakukan untuk wisata ini adalah perbaikan kolam, fasilitas gazebo, dan perbaikan akses jalan.
OPTIMALISASI PROGRAM RESEARCH ASSISTANT GURU DI SEKOLAH SEBAGAI JALUR SUKSES MBKM DI PROGRAM STUDI PENDIDIKAN FISIKA FMIPA UM Hapsoro, Cahyo Aji; Wisodo, Hari; Pujiarti, Herlin; Fawaiz, Sahal; Suryadi, Ahmad; Firmansyah, Danny; Layly, Annysa Nur
Jurnal Graha Pengabdian Vol 5, No 3 (2023)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um078v5i32023p%p

Abstract

Beberapa program asisten peneliti telah banyak dilaksanakan di berbagai bidang salah satunya pada bidang pendidikan keperawatan dan terbukti memberikan manfaat terhadap karir mahasiswa lulusan. Jika ditinjau pada bidang pendidikan, program asisten peneliti berpeluang membentuk komunitas pembelajaran profesional antara mahasiswa calon guru dan guru yang dapat meningkatkan kemampuan sosial dan individu. Namun di Indonesia masih jarang ditemukan dalam bidang pendidikan sehingga momentum program Merdeka Belajar-Kampus Merdeka sangat tepat untuk menginisiasi program asisten peneliti. Tujuan dari penelitian ini adalah untuk mengembangkan keterampilan meneliti mahasiswa calon guru dengan menjadi asisten peneliti guru dalam melakukan penelitian di sekolah, meningkatkan motivasi dan minat mahasiswa calon guru untuk berkarir menjadi guru maupun peneliti, dan meningkatkan keterampilan penulisan ilmiah dan jumlah kualitas publikasi. Kegiatan yang dilakukan dalam penelitian ini meliputi persiapan program dan pembentukan klub jurnal, survei awal dan diskusi dosen-guru, pelaksanaan program, penulisan publikasi atau karya ilmiah, serta survei akhir.
Identification of Sediment Formation Based on Magnetic Content and Element Composition of Mud Volcano in Sangiran Sediment using VSM and X-Ray Fluorescence Hapsoro, Cahyo Aji; Mariyanto, Mariyanto; Agustine, Eleonora; Iryanti, Mimin; Indriana, Rina Dwi; Rifai, Mochamad Khoirul; Ibrahim, Alpan; Budiono, Kharisma Asmarani
JPSE (Journal of Physical Science and Engineering) Vol 8, No 1 (2023): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um024v8il2023p009

Abstract

Based on trace geological history and several studies, the Sangiran mud volcano provides insight into the geology and hydrology of the region, aquifer system in the basin, groundwater flow patterns and characteristics, rock lithology, hydrogeology condition, and saltwater trap mapping. Related to these conditions, studies were conducted on the magnetic content and composition of the major oxide compounds in the Sangiran sediments. Sample analysis was based on geochemical methods. The methods consist of frequency dependent magnetic susceptibility and vibrating sample magnetometer (VSM) analysis. Geochemical analyses using x-ray fluorescence (XRF) analysis have been conducted and various elemental grades have been determined. VSM results confirm that the magnetic content of Sangiran sediments is partly dominated by Fe (17.66 percent) contained in hematite (Fe2O3). At the same time, the samples of Sangiran sediment were enriched by Si, Fe, Al, Ca, Cl, Ti, and K according to XRF measurements. The samples exhibited the highest Si and Fe concentrations in samples T1 (Si is 29.48 percent and Fe is 13.66 percent) and T7 (Si is 24.95 percent and Fe is 12.01 percent). Meanwhile, in the T4 sample, the highest concentrations were Si and Ca, 23.45 percent and 13.45 percent, respectively. Retrieved from the magnetic susceptibility measurement, this paper confirm that Fe content is one of the components of volcanic ash in the Sangiran sediment.DOI: 10.17977/um024v8i12023p009
Geochemical and Magnetic Suseptibility Analysis for Critical Minerals Detection in Igneous Rocks and Beach Sand Hariyanto, Yensi; Zulaikah, Siti; Hapsoro, Cahyo Aji; Maulida, Shofi; Zakly, Hanif 'Izzudin; Muztaza, Nordiana Mohd; Suadi, Daeng Achmad; Pratama, Aditya; Hamdi, Hamdi
Spektra: Jurnal Fisika dan Aplikasinya Vol. 9 No. 3 (2024): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 9 Issue 3, December 2024
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.093.04

Abstract

Critical minerals are an important natural resource that will continue to be necessary for modern industries. This study aims to determine the distribution of critical minerals based on geochemical data and magnetic susceptibility. Samples were taken from Lenggoksono beach, Southern Malang. The determination of chemical elements was conducted using X-ray fluorescence (XRF). Rare Earth Elements (REE) were identified using Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES). Magnetic susceptibility measurements were carried out using a Barrington Magnetic Susceptibility Meter (MS2B). The results showed that the dominant elements were Silica Oxide, SiO2 (70 Wt%), Iron Oxide, Fe2O3 (14.05 Wt%), and Calcium Oxide CaO (5.57 Wt%), which were categorized as critical minerals. The average REE elements detected were Cerium, Ce (6.75 mg/kg), Gadolinium, Gd (5.98 mg/kg), Neodymium, Nd (13.56 mg/kg), Praseodymium, Pr (6.62 mg/kg), Terbium, Tb (5.57 mg/kg), and Yttrium, Y (10.98 mg/kg). The magnetic susceptibility ranges from 13.27 to 4143.47 × 10-8m3/kg. Pearson’s Correlation analysis revealed a significant correlation between low-frequency magnetic susceptibility (ꭓlf) and high-frequency magnetic susceptibility (ꭓhf) with a significance level of 0.01. ꭓlf and ꭓhf also showed a significant correlation with Gd, with a correlation value of R² = 0.84 and a significance level of 0.05. These results indicate that the presence of one critical mineral can serve as a clue to the presence of other critical minerals, and magnetic susceptibility can be used as a proxy indicator for critical minerals in natural materials.
PEMBELAJARAN BERBASIS ALAM DI AREA WISATA SEBAGAI LANDASAN PEMBUATAN INKUBATOR BISNIS DI KELAS KEWIRAUSAHAAN SMK Zulaikah, Siti; Wisodo, Hari; Hapsoro, Cahyo Aji; Azzahro, Rossyda; Hasan, Muhammad Fathur Rouf
JURNAL WIDYA LAKSANA Vol 12 No 1 (2023)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jwl.v12i1.52937

Abstract

Pembelajaran berbasis Alam memanfaatkan obyek sekitar dalam mempelajari suatu bidang ilmu. Pembelajaran Alam banyak digunakan dalam sistem pendidikan sebagai solusi alternatif untuk mengembangakn budaya lokal. Kegiatan ini bertujuan untuk menerapkan pembelajaran berbasis alam pada kelas kewirausahaan di SMK sebagai incubator bisnis. Metode yang digunakan pada penelitian ini berupa sosialisasi dan diskusi mengenai potensi alam Donomulyo seperti Karst, Mangrove, dan area pantai. Kegiatan fokus pada Area Wisata Pantai selatan Jawa dengan beberapa jenis wisata berupa Karst, pantai, Gua, dan Mangrove. Kegiatan dimulai dengan pembuatan rundown potensi alam serta potensi yang dapat dikembangkan sebagai landasan pembentukan inkubator bisnis. Inkubator bisnis dirancang untuk pengembangan basis jenis wisata. Beberapa diantaranya, pengolahan bahan baku seperti hasil laut menjadi product yang marketable, pengembangan Wisata Mangrove menjadi wisata Edukasi, Pengembangan Science Corner dan Pemanfaatan Karst menjadi obyek Wisata. Hasil sosialisasi ini mendapat antusiasme masyarakat, yakni 90% setuju terhadap program ini.
Implementation of the Gauss-Kronrod Quadrature Method (G7, K15) on 2D Gravity Anomaly Modeling in Basins with a Polynomial Variation of Density Distribution with Depth Zulhendra; Srigutomo, Wahyu; Hapsoro, Cahyo Aji
Jurnal Penelitian Pendidikan IPA Vol 10 No 8 (2024): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i8.8493

Abstract

Forward modeling of 2D gravity anomalies, considering density contrasts that vary polynomially with depth, was performed to examine basin structures. This process involved two main stages: deriving analytical formulas and executing numerical integration. The Gauss-Kronrod Quadrature Method, utilizing 7 Gauss points and 15 Kronrod points, was employed to precisely compute these integrals. Initial modeling applied to theoretical basement scenarios with fixed density contrasts showed gravity anomalies that accurately reflected the curvature of the basement. To validate the approach, it was then applied to real-world cases including the Sebastian Vizcaino Basin, San Jacinto Graben, and Sayula Basin. By incorporating suitable density contrasts, modeling lengths, and basement curvature shapes, the results revealed that both fixed-density and depth-variable density models produced gravity anomalies with patterns consistent with the actual basement curvature. These findings validate the modeling technique’s effectiveness in representing real geological features accurately. The study confirms that the Gauss-Kronrod Quadrature Method (G7, K15) is robust for analyzing 2D gravity anomalies, providing a reliable tool for understanding the influence of varying density contrasts on gravity responses.
Co-Authors Acep Purqon Aditya Pratama Ahmad Suryadi, Ahmad Anis Nurullaili Azzahro, Rossyda Budiono, Kharisma Asmarani Danny Firmansyah Dini Fitriani Doddy Sutarno Eleonora Agustine Ferdinal, Ferdinal Hairil Anwar Hamdi Hamdi Hamdi Rifai Hari Wisodo, Hari Hariyanto, Yensi Herlin Pujiarti I Gede Putu Fadjar Soerya Djaja Ibrahim, Alpan Indriana, Rina Dwi Joko Utomo Layly, Annysa Nur Mariyanto Mariyanto Maulida, Shofi Mimin Iryanti Muhammad Fathur Rouf Hasan Muhammad Ibnu Shodiqin Muztaza, Nordiana Mohd Prawitasari, Prawitasari Raden Mohamad Herdian Bhakti Ratika Sekar Ajeng Ananingtyas Reyza Arief Taqwa, Muhammad Rifai, Mochamad Khoirul Rohmiati, Dyah Palupi Sahal Fawaiz Sentot Kusairi Sesri Santurima Siti Zulaikah Suadi, Daeng Achmad Sujito Sujito Sulur Tsuneomi Kagiyama Wahyu Srigutomo Warsa warsa Yoyok Adisetyo Laksono Zakly, Hanif 'Izzudin Zulhendra Zulhendra