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All Journal Jurnal Fisika FLUX INDONESIAN JOURNAL OF APPLIED PHYSICS BULETIN FISIKA
Oki Ade Putra
Universitas Diponegoro
Astronomy Earth & Planetary Sciences Education Energy Materials Science & Nanotechnology Medicine & Pharmacology Physics

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Sintesis dan Karakterisasi Nanofiber Komposit PVA/SiO2 dari Silika Sekam Padi Menggunakan Metode Electrospinning Iqbal Firdaus; Simon Sembiring; Junaidi Junaidi; Andrean Johandra; TB Ikhwan Rifansyah; Rizky Ponco Rahmadi; Oki Ade Putra
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.55730

Abstract

Telah berhasil dibuat membrane separator yang berpotensi diaplikasikan untuk baterai lihitum-ion, membrane separator digunakan untuk proses transfer ion dan mencegah terjadinya arus pendek. Dalam penelitian ini membrane separator PVA/SiO2 disintesis memggunakan metode electrospinning dengan variasi berat SiO2 (0, 0.6, 1.2, 2) wt%. SiO2 yang digunakan adalah hasil ekstraksi silika sekam padi. Pengaruh penambahan SiO2 pada PVA untuk meningkatkan karakteristik membrane diantaranya porositas, dan stabilitas pada suhu tinggi. Hasil membrane yang berhasil dibuat PVA, dan PVA/SiO2 membentuk serat nano dengan ukuran diameter serat semakin kecil ketika ditambahkan  SiO2 yaitu ~ 220 nm, ukuran diameter semakin kecil  meningkatkan porositas membrane dan meningkatkan kinerja membrane dengan stabilitas suhu 165 oC
Simulasi Teoretis terhadap Kaca Borat Terdoping SnO untuk Optimalisasi Efisiensi Perisai Radiasi Sinar Gamma Oki Ade Putra; Dhani Nur Indra Syamputra; Fariz Budi Arafat; Rin Hafsahtul Asiah
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p04

Abstract

Kaca perisai radiasi berbasis bismut borat telah banyak diteliti karena sifat optik dan ketahanannya yang baik. Dalam penelitian ini, dilakukan evaluasi terhadap pengaruh variasi fraksi mol SnO terhadap kinerja perisai sistem kaca xSnO–(60–x)B2O3–20Bi2O3–10TiO2–10MgO dengan x = 0, 4, 8, dan 12 mol%. Perhitungan dilakukan secara teoritis menggunakan perangkat lunak XCOM dari National Institute of Standards and Technology (NIST) pada rentang energi 0,01–3 MeV. Parameter yang dianalisis meliputi koefisien atenuasi massa (MAC), koefisien atenuasi linier (LAC), half value layer (HVL), tenth-value-layer (TVL), dan mean free path (MFP). Hasil simulasi menunjukkan bahwa penambahan SnO secara signifikan meningkatkan densitas kaca, yang berdampak pada peningkatan nilai MAC dan penurunan nilai HVL, TVL, dan MFP. Selain itu, dibandingkan dengan kaca komersial RS-253-G18 dan boraks sintetis 40%, seluruh sampel berbasis SnO menunjukkan performa perisai yang lebih baik. Oleh karena itu, semua sampel kaca berbasis SnO, khususnya dengan 12 mol% SnO, memiliki potensi besar sebagai material alternatif untuk aplikasi pelindung radiasi energi tinggi.
Electronic Properties of Topological Superconductors XC (X = V, Nb) with Hexagonal Structure: A Density Functional Theory Perspective Erik Bhekti Yutomo; Suci Faniandari; Oki Ade Putra
BULETIN FISIKA Vol. 26 No. 2 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i02.p08

Abstract

Topological superconductors are a class of materials that combine superconductivity with nontrivial topological electronic band structures. In this study, we investigate the electronic properties of two transition metal carbides, VC and NbC, in their hexagonal phases. The calculations are performed using the Density Functional Theory (DFT) approach, with explicit consideration of spin–orbit coupling (SOC) to explore the possible emergence of nontrivial band topology. The calculated band structures reveal metallic behavior in both materials, characterized by the presence of electronic states at the Fermi level. VC exhibits two Dirac points along the Γ–M and K–Γ paths, as well as a Weyl point at the K point. In contrast, NbC shows two Dirac points and one triply degenerate point along the Γ–A path. Upon inclusion of SOC, these topological features not only persist but become more pronounced, particularly near the K point and along the Γ–A direction. The projected density of states (PDOS) analysis indicates that these topological features originate from strong hybridization between the transition metal d orbitals (V 3d and Nb 4d) and the carbon 2p orbitals. These results suggest that hexagonal-phase VC and NbC are promising candidates for topological superconductors, with potential applications in future quantum technologies.
Vibrational Mean Energy and Specific Heat Capacity of Nitric Oxide, Nickel Monocarbide, and Scandium Nitride Diatomic Molecule with Screened Modified Pöschl-Teller Potential Suci Faniandari; Erik Bhekti Yutomo; Oki Ade Putra
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 22, No 2 (2025): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v22i2.22084

Abstract

This study explored the energy states of a nonrelativistic system by applying the Schrödinger equation to a particular potential. Specifically, energy levels were examined using a modified Pöschl–Teller potential. This study analyzed the impact of varying quantum numbers on energy levels and investigated the vibrational mean energy and specific heat capacity of diatomic molecules. The focus was on nitric oxide, nickel monocarbide, and scandium nitride molecules to assess their behavior at different temperatures. When the screening parameter is present, the potential becomes weaker and less confining, leading to a lower energy eigenvalue compared to when there is no screening and the potential is deeper or more confining. A screened potential results in a particle having a reduced kinetic energy because it is less confined and less tightly bound to the well. An increase in quantum number leads to a decrease in the energy level of the system. The vibrational mean energy increased at high temperatures and then steadily decreased. The vibrational specific heat capacity decreased to a negative value as the temperature decreased, indicating that the system converted kinetic energy into potential energy within the bonds. These findings offer insights into molecular stability and thermodynamic behavior, which could be beneficial for predicting and managing molecules in high-temperature environments.
Co-Authors Andrean Johandra Dhani Nur Indra Syamputra Erik Bhekti Yutomo Erik Bhekti Yutomo Fariz Budi Arafat Iqbal Firdaus Junaidi Junaidi Rin Hafsahtul Asiah Rizky Ponco Rahmadi Simon Sembiring Suci Faniandari TB Ikhwan Rifansyah