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All Journal Jurnal Penelitian Saintek POSITRON Jurnal Fisika Unand JGE (Jurnal Geofisika Eksplorasi) Jurnal Informatika dan Teknik Elektro Terapan Jurnal Fisika FLUX JPSE (Journal of Physical Science and Engineering) Indonesian Physical Review Navigation Physics : Journal of Physics Education Mitra Mahajana: Jurnal Pengabdian Masyarakat Progressive Physics Journal Jurnal Ilmu Fisika dan Terapannya (JIFTA) InSTEM Frontier Advances in Applied Science and Engineering
Kholis Nurhanafi
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Mulawarman
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 Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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Journal : Jurnal Fisika Unand

 1 
Analisis Pergerakan Partikel terhadap Rekaman Mikrotremor di Permukaan Sungai Bawah Tanah Bribin, Kawasan Karst Gunung Sewu Kholis Nurhanafi; Ahmad Zarkasi; Sahara Hamas Intifadhah; Nugroho Budi Wibowo; Aditya Yoga Purnama
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.471-478.2023

Abstract

Microtremor has been widely used to determine soil characteristics and dynamics. In this research, particle motion analysis was conducted on 15 microtremor data recordings around the surface of the Bribin Underground River in the Gunungsewu Karst Area. Spectrum analysis was conducted as a basis for determining the frequency range for the particle motion analysis process. Particle motion analysis was only carried out on the horizontal component of the microtremor signal which is expected to provide a representation of the river flow path. The results of particle motion analysis of microtremor recordings in the surface area of the Bribin Underground River show that there are only two points that have a motion-resultant oriented to certain direction, which is perpendicular to the river channel.The points are A4 and B4 which are located in the eastern part of the river flow path.
X-ray Absorption Near Edge Structure (XANES) Spectrum Interpretation for LiFePO4-Silicon Doped Cathode Material Sahara Hamas Intifadhah; Kholis Nurhanafi; Fahmi Astuti; Rahmawati Munir; Dadan Hamdani; Darminto Darminto
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.348-354.2023

Abstract

LiFePO4-Silicon doped has been widely developed as a battery cathode material. Due to the doping of silicon atoms, this study aims to determine the peak energy (E0), oxidation state and percentage of component composition for Fe K-edge. The experimental sample used are LFP Si-0%, LFP Si-1%, LFP Si-3% and LFP Si-6%. These samples were characterized using XAS (X-ray Absorption Spectroscopy). XANES spectrum showed the peak energy of Pre-edge area is 7113.08 – 7114.49 eV. The oxidation state of Fe atoms were increased and tend to be Fe3+ than Fe2+. Moreover, Linear Combination Fitting (LCF) used to determine the ratio composition FeO/Fe2O3 in experimental samples. The ratio composition indicated Fe atom is multivalent, when the percentage of silicon-doped increases, the ratio of Fe3+ increased.It has been found that the presence of silicon atoms in the LiFePO4 structure has an effect in electronic structure.
X-ray Absorption Near Edge Structure (XANES) Spectrum Interpretation for LiFePO4-Silicon Doped Cathode Material Intifadhah, Sahara Hamas; Nurhanafi, Kholis; Astuti, Fahmi; Munir, Rahmawati; Hamdani, Dadan; Darminto, Darminto
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.348-354.2023

Abstract

LiFePO4-Silicon doped has been widely developed as a battery cathode material. Due to the doping of silicon atoms, this study aims to determine the peak energy (E0), oxidation state and percentage of component composition for Fe K-edge. The experimental sample used are LFP Si-0%, LFP Si-1%, LFP Si-3% and LFP Si-6%. These samples were characterized using XAS (X-ray Absorption Spectroscopy). XANES spectrum showed the peak energy of Pre-edge area is 7113.08 – 7114.49 eV. The oxidation state of Fe atoms were increased and tend to be Fe3+ than Fe2+. Moreover, Linear Combination Fitting (LCF) used to determine the ratio composition FeO/Fe2O3 in experimental samples. The ratio composition indicated Fe atom is multivalent, when the percentage of silicon-doped increases, the ratio of Fe3+ increased.It has been found that the presence of silicon atoms in the LiFePO4 structure has an effect in electronic structure.
Analisis Pergerakan Partikel terhadap Rekaman Mikrotremor di Permukaan Sungai Bawah Tanah Bribin, Kawasan Karst Gunung Sewu Nurhanafi, Kholis; Zarkasi, Ahmad; Intifadhah, Sahara Hamas; Wibowo, Nugroho Budi; Purnama, Aditya Yoga
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.471-478.2023

Abstract

Microtremor has been widely used to determine soil characteristics and dynamics. In this research, particle motion analysis was conducted on 15 microtremor data recordings around the surface of the Bribin Underground River in the Gunungsewu Karst Area. Spectrum analysis was conducted as a basis for determining the frequency range for the particle motion analysis process. Particle motion analysis was only carried out on the horizontal component of the microtremor signal which is expected to provide a representation of the river flow path. The results of particle motion analysis of microtremor recordings in the surface area of the Bribin Underground River show that there are only two points that have a motion-resultant oriented to certain direction, which is perpendicular to the river channel.The points are A4 and B4 which are located in the eastern part of the river flow path.
Co-Authors Aditya Yoga Purnama Adrianus Inu Natalisanto Ahmad Zarkasi Ahmad Zarkasi Amirin Kusmiran Ariyanthi, Gita Putri Astuti, Fahmi Budi Eka Nurcahya, Budi Eka Dadan Hamdani Dadan Hamdani, Dadan Darminto . Darminto Darminto Erlinda Ratnasari Putri Fahmi Astuti, Fahmi Hananda Putra, Muhammad Fauzan Hidayatullah, Muhammad Intifadhah, Sahara Hamas Jerri, Alyadris Kormil Saputra Melyyanti, Meli Mislan Mohammad Asrul Munir, Rahmawati Nugroho Budi Wibowo Nugroho Budi Wibowo Nur Azis, Khafidh Nuraidha, Amalia C Nurohman, Ali Perdana, Akbar Perdhana, Radhitya Putri, Devina Rayzi Perwitasari Sutaji Rafika Ade Rahayu Rahayu, Rafika Ade Sumardi Yosaphat Susanti Susanti Syahrir Syahrir Syahrir Syahrir Ummah, Auliya Rahmatul Wibowo Nugroho Budi Wulandari, Darmawati