Article Per Year (5 Year)
p-Index From 2020 - 2025
2.296
P-Index
This Author published in this journals
All Journal Jurnal Fisika Unand Jurnal Fisika FLUX Journal of Physics: Theories and Applications JURNAL ATOMIK SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Journal of Physics and Its Applications Jurnal Fisika : Fisika Sains dan Aplikasinya Jurnal Kumparan Fisika Progressive Physics Journal ANDIL Mulawarman Journal of Community Engagement
Intifadhah, Sahara Hamas
Departement Of Physics, Faculty Of Science And Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

Published : 15 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 15 Documents
Search

 1   2 
Oxidation state analysis of LiFeSixP1-xO4/C (x = 0.06) with X-ray absorption near edge structure (XANES) in Fe K-edge and Si K-edge Sahara Hamas Intifadhah; Vera Laviara Maghfirohtuzzoimah; Pelangi Az-zahra; Wantana Klysubun; Fahmi Astuti; Mochamad Zainuri; Darminto Darminto
Journal of Physics: Theories and Applications Vol 5, No 1 (2021): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v5i1.51855

Abstract

The development of LiFePO4 as a cathode materials on lithium-ion battery was increased with the use of additional techniques such as atomic doping and coating. The material used in this report was LiFeSi0.06P0.94O4/C (LFP Si-6%), synthesized with doping silicon 6% and 11wt% carbon coating by a solid state method. X-ray Absorption Spectroscopy (XAS) characterization was used to investigate the effect on electronic and atomic structure of LFP Si-6%, especially in X-ray Absorption Near Edge Strucuture (XANES) region. XANES data measured on Fe K-edge and Si K-edge. Fe foil, FeO, Fe2O3, FePO4, Si powder, SiO, SiO2 were used as a standard sample for comparison with the result of LFP Si-6%. XANES analysis showed that the energy absorption of Fe K-edge and Si K-edge in LFP Si-6% was 7124.94 eV and 1846.16 eV, respectively. The oxidation state of Fe was Fe2.576+ between Fe2+ and Fe3+, while Si was close to the estimation of Si4+. In addition, the linear combination fitting (LCF) in XANES Fe K-edge was performed to show the ratio of Fe2+/Fe3+ (FeO/Fe2O3).
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.
MINI-REVIEW MENGENAI PEMANFAATAN MATERIAL BERBASIS POLIMER KOORDINASI BERPORI UNTUK PENYIMPANAN HIDROGEN Syaima, Husna; Intifadhah, Sahara Hamas
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This review aims to summarize the various types of Metal-Organic Frameworks (MOFs) and their utilization for hydrogen storage. MOFs have high surface area, flexibility, good stability and tunability, various active sites, and abundant raw materials. These characteristics make MOFs worthy of being considered as a new material in hydrogen storage applications. The potential for using MOFs is very broad because its properties can be determined from the choice of metal and linker. Hydrogen gas storage commonly requires high pressure tanks whereas in liquid form, it requires cryogenic temperatures due to its very low boiling point, the challenge is to synthesize MOF with high hydrogen adsorption capacity under mild conditions. Moreover, it is crucial to learn about the relationship among the pore volume and surface area of MOFs, physisorption of hydrogen, and adsorption condition.
Pengaruh Penurunan Aktivitas Cobalt-57 Terhadap QC (Quality Control) Harian SPECT (Single Photon Emission Computed Tomography) di Instalasi Kedokteran Nuklir RSUD A. W Sjahranie Samarinda Khalisha, Siti Nur; Zurma, Retno; Putri, Erlinda Ratnasari; Munir, Rahmawati; Intifadhah, Sahara Hamas
Progressive Physics Journal Vol 4 No 1 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i1.984

Abstract

The utilization of radiation in the field of nuclear medicine uses several main tools, one of them is the gamma camera. In its use, the gamma camera must always be in prime condition in accordance with the regulation of the Badan Pengawas Tenaga Nuklir (BAPETEN) No. 17 of 2012. To ensure that the gamma camera is always in prime condition, it is necessary to carry out several QCs (Quality Control) within a certain period of time with reference to international standards and recommendations from manufacturers. QC results show the measured value still within the required range (acceptance criteria), so it can be said that the gamma camera is in prime condition and ready to be used. The Nuclear Medicine Installation of RSUD A. W Sjahranie Samarinda use Cobalt-57 flood source plates to measure extrinsic uniformity during daily QC. This study used data in the form of tables of extrinsic calibration measurements and verification measurements as well as graphs of Cobalt-57 activity against QC time with extrinsic calibration methods and verification measurements were shown in this study. The conclusion is the lower the activity, the longer the QC times. Besides, the QC times based on the extrinsic callibration and verification measurements are not much different.
PELATIHAN DAN PENDAMPINGAN PENERAPAN TEKNOLOGI SEL SURYA UNTUK PENGENTASAN MASALAH ELEKTRIFIKASI Dadan Hamdani; Sahara Hamas Intifadhah; Rahmawati Munir; Adrianus Inu Natalisanto; Suhadi Muliyono
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 7, No 4 (2023): December
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v7i4.19814

Abstract

ABSTRAKEnergi listrik merupakan kebutuhan dasar bagi masyarakat pada modern sekarang ini, dimana keberadaanya sangat mempengaruhi berbagai sendi kehidupan. Keterbasan dalam penyaluran energi listrik disebabkan oleh faktor geografis yang sulit dijangkau mempengaruhi peningkatan biaya investasi dalam pemasangan instalasi dan distribusi jaringan listrik. Tujuan dari pengabdian ini yaitu mengidentifikasi tingkat kebutuhan energi listrik dan memberikan sosialisasi serta penyuluhan kepada masyarakat mengenai Teknologi Tepat Guna (TTG) sel surya. Upaya yang dilakukan adalah dengan penerapan energi terbarukan melalui konversi sumber energi matahari menjadi energi listrik secara langsung yang merupakan solusi alternatif dalam pemenuhan kebutuhan energi listrik sehari-hari untuk daerah-daerah yang belum terjangkau jaringan listrik PLN. Metode yang digunakan untuk penerapan teknologi sel surya ini dilakukan melalui kegiatan pelatihan, penyuluhan dan pendampingan kepada masyarakat di sekitar Desa Muara Enggelam, Kabupaten Kutai Kartanegara. Hasil dan kegiatan ini menunjukkan bahwa masyarakat memperoleh wawasan dan kemampuan dalam mengoperasikan teknologi sel surya. Selain itu kegiatan ini juga menghasilkan prototipe Teknologi Tepat Guna (TTG) yang kompatibel, berdaya guna, dan mudah dioperasikan bagi pengguna listrik DC, AC dan gabungannya (DC+AC) untuk pemenuhan kebutuhan listrik sehari-hari. Penerapan jangka panjang dari prototipe TTG ini perlu dilakukan kajian, baik terkait kelayakan kinerja teknologi sel surya yang melibatkan banyak faktor maupun kajian kelayakan secara ekonomi terkait pembiayaan teknologi sel surya ini.           Kata kunci: : energi listrik; energi matahari; sel surya; prototipe TTG; kelayakan. ABSTRACTElectrical energy is a basic need for people in today's modern society, where its existence greatly affects various aspects of life. Limitations in the distribution of electrical energy caused by geographical factors that are difficult to reach affect the increase in investment costs in the installation and distribution of electricity networks. The purpose of this service is to identify the level of electrical energy needs and provide socialization and counseling to the community regarding appropriate technology (TTG) solar cells. The effort made is the application of renewable energy through the conversion of solar energy sources into electrical energy directly which is an alternative solution in meeting daily electrical energy needs for areas that have not been reached by the PLN electricity network. The method used for the application of solar cell technology is carried out through training, counseling and mentoring activities for the community around Muara Enggelam Village, Kutai Kartanegara Regency. The results and activities showed that the community gained insight and ability to operate solar cell technology. In addition, this activity also produced a prototype of Appropriate Technology (TTG) that is compatible, effective, and easy to operate for users of DC, AC and combined electricity (DC + AC) to fulfill their daily electricity needs. The long-term application of this TTG prototype needs to be studied, both related to the feasibility of solar cell technology performance involving many factors and economic feasibility studies related to the financing of this solar cell technology. Keywords: electrical energy; solar energy; solar cell; TTG prototype; feasibility.
Mini-Review: The Influence of Coating and Doping on The Crystal Volume and Discharge Capacity of Lithium Iron Phosphate-Based Materials as Battery Cathode Intifadhah, Sahara Hamas; Syaima, Husna
Jurnal Kumparan Fisika Vol. 7 No. 2: Agustus 2024
Publisher : Unib Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jkf.7.2.74-83

Abstract

ABSTRAK   Baterai ion litium adalah jenis baterai isi ulang yang memiliki kapasitas tinggi, potensi elektrokimia yang baik, dan daya tahan yang kuat. Perkembangan LiFePO4 sebagai material katoda baterai ion litium semakin meningkat dengan adanya beberapa teknik tambahan dalam proses sintesis untuk meningkatkan performa seperti teknik pelapisan dan penyisipan atom. Hal tersebut mempengaruhi volume kristal, serta sifat elektrokimia material berbasis LiFePO4. Metode pelapisan yang menunjukkan peningkatan nilai kapasitansi material berbasis LiFePO4. Sedangkan pada metode penyisipan atom, beberapa penelitian menggunakan atom Ce, Ru, Co, Na, Si, Mn, Zn dan In untuk disisipkan di atom Fe, Li, atau P pada material berbasis LiFePO4. Hasil yang diperoleh dari beberapa penelitian tentang sintesis material katoda LiFePO4 menunjukkan adanya peningkatan kapasitas discharging dan peningkatan volume kristal olivine, sehingga teknik pelapisan dan penyisipan ini dapat digunakan untuk peningkatan performa elektrokimia.   Kata  kunci: LiFePO4, Pelapisan, Penyisipan, Volume Kristal, Kapasitansi   ABSTRACT   Lithium-ion batteries are a type of rechargeable battery that has high capacity, good electrochemical potential, and strong durability. The development of LiFePO4 as a cathode material for lithium-ion batteries has been increasing with the addition of several techniques in the synthesis process to enhance performance, such as coating and atom insertion techniques. These techniques affect the crystal volume and the electrochemical properties of LiFePO4-based materials. Coating methods have shown improvements in the capacitance values of LiFePO4-based materials. Meanwhile, in atom insertion methods, some studies have used Ce, Ru, Co, Na, Si, Mn, Zn, and In atoms to be inserted into Fe, Li, or P atoms in LiFePO4-based materials. Results from several studies on the synthesis of LiFePO4 cathode materials have shown an increase in discharge capacity and an increase in the volume of olivine crystals, indicating that coating and insertion techniques can be used to improve electrochemical performance.   Keywords: LiFePO4, Doping, Coating, Crystal Volume, Capacity
ANALISIS KELUARAN BERKAS FOTON FREE FLATTENING FILTER LINAC VARIAN HALCYON DENGAN VARIASI LUAS LAPANGAN RADIASI Putri, Aprilia Jatiningtiyas Ragil; Wardani, Pratiwi Sri; Intifadhah, Sahara Hamas
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 9 No 2 (2024): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v9i2.19345

Abstract

Penelitian ini bertujuan untuk menentukan hasil deviasi pengukuran keluaran berkas foton 6 MV Free Flattening Filter berdasarkan standar toleransi yang diperbolehkan pada protokol IAEA TRS No. 483 dan TRS No. 398 serta mengetahui pengaruh variasi luas lapangan radiasi terhadap keluaran berkas radiasi. Penelitian ini dilakukan menggunakan bantuan software MyQA Accept yang merupakan perangkat lunak QA tahunan. Penelitian ini menggunakan teknik Source Surface Distance (SSD) dengan metode Percentage Depth Dose (PDD) dan variasi luas lapangan 10×10 cm2, 12×12 cm2, 15×15 cm2, 20×20 cm2, 25×25 cm2, dianalisis untuk dapat menentukan kualitas dosis radiasi. Hasil analisis menunjukkan bahwa keluaran berkas per 2 MU lapangan 10×10 cm2 sebesar 1,999 Gy dengan deviasi 0,026%, lapangan 12×12 cm2 sebesar 2,025 Gy dengan deviasi 1,268%, lapangan 15×15 cm2 sebesar 2,037 Gy dengan deviasi 1,833% dan lapangan 20×20 cm2 sebesar 2,058 Gy dengan deviasi 2,900%, nilai ini masih berada dalam rentang standar toleransi IAEA karena ˂3%. Namun, keluaran berkas lapangan 25×25 cm2 sebesar 2,084 Gy dengan deviasi 4,209%, dianggap tidak lolos dan melewati batas toleransi IAEA sehingga dapat menyebabkan efek radiasi untuk organ sehat di sekitar target.
Verification of Co-60 Source in Brachytherapy Equipment Using TW33005 Well-Type Chamber Hemelia, Junita; Wardani, Pratiwi Sri; Intifadhah, Sahara Hamas; Zarkasi, Ahmad; Putri, Devina Rayzy Perwitasari Sutaji
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24100

Abstract

Accidents in brachytherapy have occurred and are documented by the IAEA. These incidents are attributed to various factors, such as inaccurate sources, lack of independent verification, and equipment failures due to inadequate calibration. Verifying radioactive sources is crucial for ensuring patient safety. Verification is conducted to confirm that the measured source activity is accurate and stable. Accuracy and stability of source activity are two essential parameters in verification. Source activity accuracy indicates how closely the measured source activity aligns with the reference source activity, while source activity stability reflects the well-type chamber's ability to produce consistent results over time. This study aimed to verify the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital using a TW33005 well-type chamber and analyze the results against national and international standards. The results showed that the Co-60 source activity values remained accurate and stable over five months. The highest accuracy was observed in November 2023 (-2.011%), while the lowest was in October 2023 (-2.397%). The highest stability was recorded in September 2023 (-0.416%), and the lowest in October 2023 (-2.090%). In conclusion, the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital met the accuracy standards set by ESTRO and BAPETEN of 3% to 5% and the stability standard set by the IAEA of ±3%. This indicates that the sources are safe for use in brachytherapy.
Synthesis and Modeling of Adsorbents from Natural Materials for Heavy Metal Lead in Mahakam River Water Samples Rahmawati Munir; Ahmad Zarkasi; Dadan Hamdani; Sahara Hamas Intifadhah; Akbar Perdana; Alris Sanca Pratama Putra
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 20, No 3 (2023): 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.v20i3.16934

Abstract

The Mahakam River is a source of water for the people of Samarinda, East Kalimantan. However, Mahakam river water is not classified as quality water. As a result of industrial mining activities, river water is polluted by heavy metals such as Lead (Pb). These problems can be overcome by using the adsorption method to purify water. The adsorption method has become popular in adsorbing heavy metals contained in polluted water. The purpose of this study was to synthesize natural materials which are adsorbents for the heavy metal Pb. The materials used as natural adsorbents are household waste, namely ashes (AG), egg shells (CT), tea dregs (AT). Based on the results of the Atomic Absorption Spectroscopy (AAS) characterization test, data were obtained on the decrease in the concentration of heavy metal Pb in samples of Mahakam river water. The initial concentration of 1.8 mg/L became 0.24 mg/L (10 gr adsorbent AG) and became 0.17 mg/L (10 gr adsorbent AG+CT). While the use of AT adsorbent was applied to artificial waste with an initial concentration of 40 mg/L to 0.002 mg/L. Furthermore, according to data measurement, modeling was carried out using the Langmuir Isotherm and Freundlich Isotherm models to determine the adsorption capacity of tea dregs, eggshells, and ashes.
Co-Authors Aditya Yoga Purnama Adrianus Inu Natalisanto Ahmad Zarkasi Akbar Perdana Alris Sanca Pratama Putra Astuti, Fahmi Budiman, Christoper Michael Dadan Hamdani Dadan Hamdani Dadan Hamdani Dadan Hamdani, Dadan Darminto . Darminto Darminto Darminto Darminto Fahmi Astuti, Fahmi Hemelia, Junita Husna Syaima Khalisha, Siti Nur Kholis Nurhanafi Maharani, Yuliana Juice Munir, Rahmawati Nugroho Budi Wibowo Nugroho Budi Wibowo Pelangi Az-zahra Prayoga, Ahmad Yudis Esa Putri, Aprilia Jatiningtiyas Ragil Putri, Devina Rayzy Perwitasari Sutaji Salamah, Alifah Balqis Suhadi Muliyono Vera Laviara Maghfirohtuzzoimah Wantana Klysubun Wardani, Pratiwi Sri Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad Zurma, Retno