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All Journal Elektron Jurnal Ilmiah Jurnal Sains Materi Indonesia Jurnal Ilmiah Aplikasi Isotop Radiasi Rekayasa Mesin Omega: Jurnal Fisika dan Pendidikan Fisika Indonesian Journal of Chemical Science Science and Technology Indonesia Jurnal Sains Teknologi dan Lingkungan (JSTL) Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Spektra: Jurnal Fisika dan Aplikasinya Jurnal Teori dan Aplikasi Fisika Jurnal Ilmu dan Inovasi Fisika AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin
Budhy Kurniawan
Departemen Fisika FMIPA Universitas Indonesia Jl. Salemba Raya No. 4, Jakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Other

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Analysis of Structure, Morphology, Magnetic Properties, and Microwave Absorption of Lanthanum Orthoferrite (LaFeO3) Naibaho, Marzuki; Widakdo, Januar; Kurniawan, Budhy; Nehan, Phahul Zhemas Zul; Vitayaya, Okvarahireka; Novita; Ramlan; Adi, Wisnu Ari; Ginting, Masno
Science and Technology Indonesia Vol. 9 No. 4 (2024): October
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.4.851-856

Abstract

LaFeO3 has been prepared using the solid-state reaction method with High Energy Milling (HEM). The preparation of LaFeO3 was carried out using stoichiometric calculations. Based on the XRD measurement results, single-phase LaFeO3 with an orthorhombic crystal structure was obtained. From the SEM results, the morphology of LaFeO3 is uniform, and the EDS results show the weight percentage of La, Fe, and O elements are 49.74, 21.08, and 29.18 wt%, respectively. VSM LaFeO3 results show magnetic saturation, remanence, and coercivity are 0.24 emu/g, 0.02 emu/g, and 853.38 Oe, respectively, and the absorption of LaFeO3 is -7.40 dB at a frequency of 6.02 GHz with a LaFeO3 sample thickness of 1.5mm.
Nickel Salt Dependency as Catalyst in the Plating Bath on the Film Properties of Cu/Cu-Ni Rosyidan, Cahaya; Kurniawan, Budhy; Soegijono, Bambang; Maulani, Mustamina; Samura, Lisa; Nababan, Frederik Gresia; Putra, Valentinus Galih Vidia; Susetyo, Ferry Budhi
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.529-538

Abstract

Metal plating frequently employs nickel (Ni) and copper (Cu) as anodes. Cu/ Cu-Ni film formed has many advantages, such as better corrosion resistance and high hardness characteristics. This study aims to assess the properties of Cu/Cu-Ni film, such as phase, surface morphology, crystallographic orientation, hardness, corrosion analysis, and contact angle, which were fabricated using electrodeposition with various Ni salt additions (0.3, 0.5 and 0.7 M). In addition, the cathode current efficiency (CCE) and deposition rate of the Cu/Cu-Ni electrodeposition were also investigated. An increase in Ni salt in the plating bath could enhance the pH, promoting higher CCE and depleting hydrogen evolution at the cathode, leading to the presenting Ni phase in the alloy. The higher concentration of Ni salt in the solution could also enhance the deposition rate due to a shift to a pH value, which affects the roughening of the surface morphology, promoting a higher contact angle. All crystal structures generated by Cu/Cu-Ni electrodeposition were FCC, with the preferred orientation of the (111) plane. Crystallite size and lattice strain depend on the deposition rate. Less crystallite size and lattice strain affect the film’s hardness and corrosion resistance. Moreover, the third bath had the resulting Cu-Ni layer with the best hardness and corrosion rate of around 136 HV and 0.081 mmpy.
Brief Report on The Population Survey Long-tailed Macaque (Macaca fascicularis [Raffles,1821]) in West Nusa Tenggara, Indonesia Hadi, Islamul; Wiantoro, Sigit; Inayah, Nurul; Maharadatunkamsi, Maharadatunkamsi; Atikah, Tika Dewi; Zamroni, Yuliadi; Supardiono, Supardiono; Alfian, Muhammad Rijal; Sadewo, Imran; Mubarokah, Nurlaila; Kurniawan, Budhy; Tresnani, Galuh
JURNAL SAINS TEKNOLOGI & LINGKUNGAN Vol. 10 No. 3 (2024): JURNAL SAINS TEKNOLOGI & LINGKUNGAN
Publisher : LPPM Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jstl.v10i3.701

Abstract

Survey on the population and distribution of long-tailed macaque (Macaca fascicularis [Raffles, 1821]) in the administrative areas of West Nusa Tenggara Province have been conducted during June-July 2024 to examine the distribution and population status on the macaque.  The on-road reconnaissance survey, interview and literature studies have applied to collect data. We recorded 6146 individuals from 307 groups of long-tailed macaques in eight regencies. Of the 6146 individuals of long-tailed macaques, 1532 individuals are recorded living in conservation area, while 4614 individuals live in outside conservation area, respectively.  The number of individuals and troops of the monkey showed us the minimum number that can be recorded. Further study needs to be conducted in addressed to dig more information on the existence of long-tailed macaque in West Nusa Tenggara. Furthermore, population information and distribution of long-tailed macaques could be the basic knowledge on the population management efforts in the future.
INVESTIGASI SIFAT DIELEKTRIK LAPISAN KOMPOSIT PVDF/ BATIO3/HAP DISINTESIS DENGAN METODE SPIN COATING Adnan, Septian Rahmat; Kurniawan, Budhy; Soegijono, Bambang; Erni, Nofi; Rachman, Taufiqur; Amperajaya, M. Derajat
AME (Aplikasi Mekanika dan Energi): Jurnal Ilmiah Teknik Mesin Vol. 11 No. 2 (2025)
Publisher : Universitas Ibn Khaldun Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/ame.v11i2.1635

Abstract

Pada penelitian ini larutan komposit PVDF/BaTiO3/HAp disintesis menggunakan material Polyvinylidene Fluoride (PVDF), Barium Titanat (BaTiO3) komersial dan Hydroxyapatite (HAp) yang disintesis dari tulang sapi. Selanjutnya larutan komposit disintesis menggunakan metode solution mixing dan dideposisi menggunakan metode spin coating pada subtrat tembaga (Cu), Silikon (Si) dan Platinum (Pt) pada kecepatan 2000 rpm, 3000 rpm dan 4000 rpm sebanyak 2 lapis untuk tiap sampel. Didapatkan bahwa kecepatan spin coating optimum pada 4000 rpm. Ketebalan dan kekasaran lapisan komposit PVDF/BTO/HAp yang dideposisi pada subtrat silicon (Si) dan Pt 2 lapis yaitu pada rentang 1,04 – 2,52 μm dan kekasaran < 0,1 μm. Dengan bertambahnya komposisi hydroxyapatite pada lapisan komposit PVDF/BTO/HAp dengan kecepatan spin coating 4000 rpm menyebabkan nilai impedasi, konstanta dielektrik dan dielectric loss (tg δ) dengan nilai konstanta dielektrik 15(100 Hz) pada komposisi komposit 35,83 Wt%:35,83 Wt%:28,34 Wt% dan 9 (100 Hz) pada komposisi 40 Wt%:40 Wt%: 20 Wt%, serta nilai dielectric loss (tg δ) 0,15 (100 Hz) dan 0,5 (100 Hz)  pada komposisi 35,83 Wt%:35,83 Wt%:28,34 Wt%. Nilai konstanta dielektrik dari lapisan komposit PVDF/BTO/HAp mengalami kenaikan dengan bertambahnya komposisi hydroxyapatite dari 20Wt% ke 28,34Wt% pada frekuensi rendah di rentang 10 – 1k Hz tetapi menurun pada frekuensi rendah direntang 10 – 100 Hz.
Identifikasi Fasa dan Informasi Kristal Nanopartikel Oksida Spinel CuCr2O4 Memanfaatkan Analisis XRD Berbasis Metode Rietveld Refinement Kurniawan, Budhy
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 8, No 1 (2024)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jiif.v8i1.50693

Abstract

Nanopartikel spinel oksida CuCr2O4 memiliki sejumlah sifat fisika dan kimia yang telah diaplikasikan dalam beragam sektor teknologi. Proses produksi dari material CuCr2O4 yang memanfaatkan reaksi termal yang umumnya lebih rendah dibandingkan tingkat ketahanan termal dari material CuCr2O4 yakni di suhu 1.000oC. Penelitian ini berusaha untuk menguji pengaruh suhu sintering yang berada di 1.000oC sebagai rentang suhu uji terhadap kontributor struktur di skala kristal. Metode sintesis dalam memproduksi material yakni sol-gel serta karakterisasi untuk mengungkap informasi kristal yakni difraksi sinar X (XRD) dengan metode analisa Rietveld Refinement. Diketahui bahwa eksistensi ganda dari dua struktur kristal CuCr2O4 muncul, dengan dominasi berasal dari struktur β2-CuCr2O4. Impuritas yang berasal dari komponen lain yakni CuCrO2 juga dapat dideteksi dengan fraksi volume yang tidak dominan dibandingkan komponen utama pada β2-CuCr2O4.
Communication Satellite-Based Rainfall Estimation for Flood Mitigation in Papua Raden Yudha Mardyansyah; Budhy Kurniawan; Santoso Soekirno; Danang Eko Nuryanto
Jurnal Penelitian Pendidikan IPA Vol 10 No 12 (2024): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i12.8409

Abstract

Papua, an equatorial region in Indonesia, faces unique geographical and natural challenges, including heavy annual rainfall. This heavy rainfall increases flooding risks and impacts infrastructure, the economy, and daily life. Despite the importance of rain gauges for monitoring floods and climate change, Papua's difficult geography and limited transportation infrastructure hinder their installation and maintenance. In this work, we investigate a deep learning one-dimensional convolution neural network (1DCNN) model to estimate rainfall intensity using energy per symbol to noise power density ratio (Es/No) of the signals received from a communication satellite signal coupled with additional data representing satellite daily movement. The findings of this study demonstrate that the performance of the proposed model has a higher accuracy for moderate to heavy rainfall than for light rainfall. The NRMSE values for light rain, moderate rain, and heavy rain are 47.09, 31.78, and 33.58%, respectively. These results show that this method is promising for monitoring heavy rainfall as a flood mitigation effort. However, there is still room to improve the accuracy of the estimation such as using other secondary data that is highly correlated with rain at the satellite transceiver location.
Analisis Struktur Kristal dan Morfologi Polikristalin La0,7Ba0,3Mn(1-x)FexO3 (x = 0; 0,1; 0,2; 0,25) dengan Metode Sintesis Sol-Gel Pembakaran Otomatis Sitrat-Nitrat Ryka Usnilawaty; Budhy Kurniawan
Jurnal Teori dan Aplikasi Fisika Vol. 13 No. 01 (2025): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v13i01.371

Abstract

Polycrystalline La0.7Ba0.3Mn(1-x)FexO3 (x=0, 0.1, 0.2, 0.25) has been successfully synthesized using the sol-gel citrate-nitrate auto combustion method, with the high purity basic materials of La2O3, Ba(NO3)2, Mn(NO3)2.4H2O, Fe2O3, and C₆H₈O₇.H₂O as reaction fuel. After the gel was formed, the sample was heated at 180oC for 2.5 hours. Calcination was carried out at 800oC for 2 hours. Then the sample was compressed with a pressure of 10 tons, the sample was sintered at a temperature of 900oC for 2 hours. X-Ray Diffraction (XRD) analysis data shows a single phase in the four samples. SEM analysis data shows that the morphology of the particle diameter becomes smaller as the Fe is being added to the Mn site. EDS analysis data shows the element content in the four samples which is in accordance with stoichiometric calculations, and confirms that the product resulting from the sol-gel synthesis is homogeneous. The calculation of Goldschmidt tolerance factor has confirmed that the crystal structure is rhombohedral perovskite structure (0.929, 0.934, 0.939, and 0.941). Keywords: Lanthanum Manganites, Sol-Gel, Polycrystalline, Morphology, Rhombohedral.
Electrical Resistivity and Magnetoresistance Properties of Cation A-site substitution in La0.8-xAgxCa0.2MnO3 (x = 0.1 and 0.15) Munazat, Dicky Rezky; Kurniawan, Budhy; Kamila, Rina; Manawan, Maykel; Imaduddin, Agung
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.80160

Abstract

The polycrystalline sample of La0.8-xAgxCa0.2MnO3 (x = 0.1 and 0.15) has been successfully synthesized using a sol-gel method in our previous work. Here, we have investigated the electrical resistivity and magnetoresistance of both samples. All samples exhibited metallic behavior, as evidenced by the resistivity data measured in the temperature range from 9 to 285 K. As silver concentration increases, the resistivity decreases throughout the whole explored temperature range. Increasing silver ion concentration improves double exchange interaction (DE) between Mn3+ and Mn4+ which is responsible for gradually decreasing resistivity. The electrical transport is quite well described by a theory based on grain boundary factor, electron-electron interaction, and Kondo-like spin-dependent scattering mechanisms. Both samples show low-field magnetoresistance (LFMR) at low temperatures. The maximum magnetoresistance values for both samples were observed at 15 K, with values of -23.16% and -25.17% for x = 0.10 and 0.15, respectively.
Co-Authors - Jumaeri A. Purwanto Ade Lestari Yunus Adin Sarmawan Agung Imaduddin Agung Imaduddin, Agung Agus Purwanto Agus S.W. Ahmad Jazuli Akhmad Rasyid Syahputra Andika Fajar Arif - Rachmanto Atikah, Tika Dewi Azwar Manaf Bambang P. S. Bambang Soegijono Budi Siswanto Cahaya Rosyidan Danang Eko Nuryanto Danang Eko Nuryanto Dudung A. K. Dudung Abdul Kodir Engkir Sukirman Ferry Budhi Susetyo Galuh Tresnani Handoko, Djati Hasan Fahad Hasbiyallah Hasbiyallah Herry Mugihardjo Indra Putra Siahainenia ISLAMUL HADI Iwan Sugihartono Januar Widakdo Kamila, Rina Laksanawati, Wahyu Dian Lingga Hermanto Lingga Hermanto M Derajat Amperajaya Maharadatunkamsi Maharadatunkamsi, Maharadatunkamsi Manawan, Maykel Masno Ginting Maulani, Mustamina Muhammad Fikri Radiyan Muhammad Rijal Alfian Munazat, Dicky Munazat, Dicky Rezky Muzadi Didik O. Nababan, Frederik Gresia Naibaho, Marzuki Nehan, Phahul Zhemas Zul Nofi Erni Novita Nunung - Nuraeni Nurlaila Mubarokah Nurul Inayah Nurul T.R Putra, Valentinus Galih Vidia Putri, Witha Berlian R Yudha Mardyansyah Raden Yudha Mardyansyah Ramlan Ryka Usnilawaty Saadah, Nelis Sadewo, Imran Samura, Lisa Santoso Soekirno Saptari, Sitti Ahmiatri Septian Rahmat Adnan, Septian Setyo Purwanto Sigit Wiantoro, Sigit Suhardjo Poertadji Suharno Suharno Suharno Suharno Sumarjianto Sumarjianto Supardiono, Supardiono Suryadi Suryadi TAUFIQUR RACHMAN, TAUFIQUR Teguh Yoga Raksa Utami Widyaiswari Vitayaya, Okvarahireka Wahyu Rudi Hartono Wisnu Ari Adi Wisnu Ari Adi Wisnu Ari Adi Wisnu Ari Adi Y. E. Gunanto Y. E. Gunanto Yuliadi Zamroni