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All Journal Teknotan: Jurnal Industri Teknologi Pertanian Jurnal Ilmu Dasar Jurnal Penelitian Fisika dan Aplikasinya (JPFA) IPTEK The Journal for Technology and Science BERKALA SAINSTEK Natural B Jurnal Fisika Unand JFA (Jurnal Fisika dan Aplikasinya) UNEJ e-Proceeding Jurnal Fisika FLUX Sistemasi: Jurnal Sistem Informasi Spektra: Jurnal Fisika dan Aplikasinya STRING (Satuan Tulisan Riset dan Inovasi Teknologi) Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Pillar of Physics: Jurnal Berkala Ilmiah Fisika InSTEM Journal of Electronics and Instrumentation
Agung Tjahjo Nugroho
Jurusan Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Jember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Other

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Flooded Area Mapping and Its Relationship to the Land Use, Soil Type, and Rainfall in North Konawe Regency Cahyono, Bowo Eko; Putri, Ervina Ikke Septiyas; Nugroho, Agung Tjahjo
Jurnal ILMU DASAR Vol 23 No 2 (2022)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v23i2.23898

Abstract

The flood incident in North Konawe Regency, Southeast Sulawesi that occurred on June 2nd, 2019 was the largest flood disaster in that area since the last 42 years, so it is interesting to study. As part of disaster risk management, it is necessary to do flood mapping to determine the distribution of flooded areas and identify areas that have potential for flooding. Mapping of flood inundation areas was carried out using Sentinel-1 data. Land use, rainfall and soil types are used as an analysis of their were relationship to the distribution of flood. The distribution of flood based on the identification of the presence of inundation covered 3 sub-districts, namely Oheo District, Asera District and Andowia District. Correlation of flood distribution to the land use, rainfall and soil type was identified using Pearson correlation value (r). The correlation between flood distribution and land use was -0.59 that indicates the correlation is moderate. Moreover, the correlation of flood distribution to the rainfall was 0 which means the correlation was very weak, and lastly, the correlation value of the flood distribution with soil type was 0.88 or the correlation was very strong.
The Application of Cows Rumen for Electricity Generation Through The Implementation of A Ceramic-Based Microbial Fuel Cell System Mulyono, Tri; Hutamia, Diah Meirendi; Rofi’i, Imam; Misto, M.; Nugroho, Agung Tjahjo; Hariadi, Yuda Cahyoargo
Jurnal ILMU DASAR Vol 25 No 1 (2024)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jid.v25i1.44448

Abstract

The growth in population is not adequately matched by the corresponding increase in energy demand. The imperative for prioritizing the exploration of alternative energy sources that possess attributes of safety, affordability, and ample access to raw materials cannot be overstated. An energy source with significant potential is a microbial fuel cell (MFC)-based energy source. This study aims to investigate the utilization of cow rumen as a substrate and source of nutrition in the bioenergy system of microbial fuel cells (MFCs). The present study aims to investigate the impact of substrate concentration and bacterial incubation duration derived from bovine rumen bacteria on the attainment of optimal power density. The research employed a Dual Chamber Microbial Fuel Cell (MFC) device using a Proton Exchange Membrane (PEM) constructed from ceramic materials. Daily observations were conducted over a period of 30 days. The performance of MFC was assessed utilizing the polarization technique. The findings indicated that altering the proportion of bovine rumen bacterial substrates and the duration of bacterial incubation had an impact on the power density seen in the Microbial Fuel Cell (MFC) system. The optimal conditions were attained when the substrate concentration reached 3640 ppm and after 7 days, resulting in a maximum power density of 864 mW/m2.
The Pattern of Microwave Scattering by the Dielectric of Milks Nugroho, Agung Tjahjo; Sa’adah, Nurul; Cahyono, Bowo Eko
BERKALA SAINSTEK Vol 10 No 1 (2022)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v10i1.30155

Abstract

A microwave electric field scattering by a dielectric object had been developed to identify the type of a milk. A simple geometric tomographic system is applied. The milk is placed in a cylindrical tube and emitted with a microwave signal which is described in term of a harmonic function. The scattering field anywhere outside the cylinder is quantifed analitycaly in which the unknown coefecients of the analytic function are determined at the surface of the cylinder. Three different type of milks, whole milk, UHT, and skim milk are studied. The incident fields are scanned from 1 GHz to 20 GHz and the scattering fields due to the illumination are quantified in three different locations around the objects. The study shows that the scattering field pattern depent on the the type of the milk. The whole milk produces the lowes and highest magnitude of the scattering field at 2.4 GHz and 4.5 GHz respectively. These frequency points are higher that that produce by the UHT and skim milk.
Rancang Bangun Indoor Positioning System berbasis Wireless Smartphone menggunakan Teknik Global Positioning System dengan Metode Absolut Jamaluddin, J.; Nugroho, Agung Tjahjo; Maulina, Wenny
BERKALA SAINSTEK Vol 7 No 1 (2019)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v7i1.9914

Abstract

Indoor Positioning System (IPS) merupakan teknologi informasi untuk menentukan posisi objek di dalam ruangan berbasis wireless smartphone. Perangkat yang digunakan dalam penelitian ini adalah empat unit smartphone, satu smartphone sebagai transmitter, dan tiga smartphone lainnya sebagai receiver. Tujuan penelitian ini adalah mendapatkan model dan tingkat akurasi dari IPS berbasis wireless smartphone menggunakan teknik Global Positioning System (GPS) dengan metode absolut. Penelitian ini dilakukan dengan membuat dua model IPS dan melakukan pengukuran intensitas sinyal Wi-Fi berdasarkan masing-masing model IPS yang telah dibuat untuk mendapatkan persamaan linier antara jarak dan intensitas sinyal Wi-Fi. Persamaan linier yang didapatkan dari model IPS digunakan untuk menentukan jarak antara receiver dan transmitter berdasarkan intensitas sinyal Wi-Fi yang terukur pada saat pengujian model, kemudian informasi jarak tersebut digunakan untuk menentukan posisi objek (transmitter). Hasil penelitian menunjukkan bahwa Model 1 IPS berbasis wireless smartphone mampu mengestimasi posisi dengan rata-rata tingkat kesalahan mencapai 4,46 m dan tingkat akurasinya mencapai 76,51%. Model 2 IPS mampu mengestimasi posisi dengan rata-rata tingkat kesalahan 9,68 m dengan tingkat akurasinya mencapai 49,03%. Berdsarakan hasil tersebut, dapat disimpulkan bahwa model 1 IPS memiliki tingkat akurasi yang lebih baik untuk mengestimasi posisi objek daripada model 2 IPS. Kata Kunci: Global positioning system (GPS), indoor positioning system (IPS), wireless smartphone.
Texture Features of Aglaonema Leaves with Local Binary Pattern Code Nugroho, Agung Tjahjo; Nursulistyono, Yuda; Cahyono, Bowo Eko; Subekti, Agus
Sistemasi: Jurnal Sistem Informasi Vol 13, No 4 (2024): Sistemasi: Jurnal Sistem Informasi
Publisher : Program Studi Sistem Informasi Fakultas Teknik dan Ilmu Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32520/stmsi.v13i4.4180

Abstract

The Aglaonema type and quality is difficult to identify due to leaf pattern variety. For this reason, a technique is developed to classify Aglaonema types from leaf images. The Aglaonema is identified using the Local Binary Pattern (LBP) technique. The LBP recognizes objects in the form of pixel neighbor patterns in binary code, which is sensitive to the radius (R) and the number of neighbors (P) pixels. In this article we will study the appropriate radius and number of neighbors so that the LBP code becomes an accurate abject texture attribute. Experimentally, R is varied from 1 to 5 while P is varied from 4 to 24 pixels. Two types of Aglaonema with two varieties taken from each type were used to test the accuracy of the LBP code. The accuracy of the classification results is carried out with the help of K-Nearest Neighbors (KNN). The results show that the greater the number of neighbors in determining the LBP code, the more accurate the classification results. Neighbors with a total of 18 have a stable accuracy reaching a total of 79%. Increasing the number of neighbors does not significantly affect accuracy. The neighbor radius affects the batik type of Aglaonema, the wider the neighbor area, the accuracy increases up to 84%, but for the Lipstick type, the best accuracy is obtained when R=3. By choosing the right R and P, the types of Aglaonema batik and Lipstick can be differentiated well.
Solusi Numerik Hamburan Gelombang Mikro TMz oleh Silinder Dielektrik dengan Method of Moment serta Volume EFIE dan Pulses Basis Function Fauziah, Helmi; Nugroho, Agung Tjahjo; Cahyono, Bowo Eko
Jurnal Fisika Unand Vol 11 No 1 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.11.1.15-21.2022

Abstract

Solusi numerik hamburan gelombang mikro TMz oleh silinder dielektrik dapat dicari dengan menggunakan metode MoM (Method of Moment), dimana silinder akan dibagi menjadi beberapa sel. Persamaan medan datang dapat dicari dengan Volume EFIE dan rapat arus permukaan dapat dicari dengan pulses basis function. Sehingga akan mendapatkan magnitude medan total, fase dan error relatifnya. Hasil dari solusi numerik adalah solusi numerik akurat apabila jumlah sel yang digunakan semakin banyak. Pengaruh frekuensi dan jari – jari silinder terhadap magnitude adalah membuat grafik magnitude memiliki banyak bukit, serta pengaruh frekuensi dan jari – jari silinder terhadap fase adalah membuat grafik fase semakin merapat.
Co-Authors Agus Subekti Ahmad Zaenal Hayat Ainayya Halifah Bonanza Vidya Rashmi Nugroho Cahyono, Bowo Eko Endhah Purwandari Ervin Budi Febriawan Fauziah, Helmi Frahma, Yazella Feni Ghiffari, Mochammad Husen, Jamal Hutamia, Diah Meirendi Jamal Husen Jamaluddin, J. Lestari, Merinda Misto, M. Musli Ariani Niken Dwi Wulandari Nursiyanto, Widia Nursulistyono, Yuda Nurul Priyantari Putri, Ervina Ikke Septiyas Rifang Pri Asmara Rijadi, Arief Rizky Mauli Diyah Rofi’i, Imam Sa’adah, Nurul Sri Indariyatul Masruroh Totok Wicaksono Tri Mulyono Wenny Maulina Wenny Maulina, Wenny Yazella Feni Frahma Yazella Feni Frahma Yuda Cahyoargo Hariadi Yustisi Wulandari