cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Marzuki
Contact Email
marzuki14apr12@gmail.com
Phone
-
Journal Mail Official
marzuki14apr12@gmail.com
Editorial Address
-
Location
Kota padang,
Sumatera barat
INDONESIA
Jurnal Ilmu Fisika
Published by Universitas Andalas
ISSN : 19794657     EISSN : 26147386     DOI : -
Core Subject : Science,
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics
Jurnal Ilmu Fisika (JIF) is a peer-reviewed open access journal on interdisciplinary studies of physics, and is published twice a year (March and September) by Department of Physics, Andalas University Padang.
Arjuna Subject : -
Articles 449 Documents
 41   42   43   44   45 
Physical and Chemical Properties of Gayo Coffee Brewed by Boiling Method with Variation of Particle Coffee Ground Yufita, Evi; Muhammad Shadiq Maula, Teuku; Gunawati, Gunawati; Lloyd Woodfield, Peter; Yusibani, Elin
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.9-18.2025

Abstract

The effect of coffee ground particle size by the boiling method on the values of physical and chemical parameters is studied. The coffee used is Arabica (Luwak, wine, honey) and Robusta from the Gayo Highlands, Aceh Province, Indonesia. Extraction of the coffee brew uses the boiling method with different particle sizes of coffee grounds (fine and coarse). The caffeine content in the coffee brew is identified using the FieldSpec4 Hi-Res Spectrometer. The particle size of coffee grounds affected the coffee brew's physical properties and caffeine content. The physical properties in the form of the pH value of Arabica coffee brew are lower than Robusta in a range from 4.87 to 4.97 and 5.13 to 5.28, respectively. The pH of coffee brew with fine particle sizes is slightly higher than for coarse ones for Robusta coffee brew. The density of the brew is in the vicinity range of 0.99 g/cm3. Arabica and Robusta brews differ in viscosity and caffeine release, influenced by coffee particle size. Coarse particles yield more caffeine in Arabica, while fine particles release more in Robusta, demonstrating the impact of grind size on caffeine extraction in coffee.
Identifikasi Keberadaan Batu Apung Berdasarkan Data Georadar dan Data Geolistrik Resistivitas di Kecamatan Ampenan dan Kecamatan Sekarbela, Kota Mataram Arsi, Sefti Dini; Farid, Muhammad; Refrizon, Refrizon
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.41-52.2025

Abstract

Retraction Notice This article has been retracted at the request of the Editor-in-Chief after reviewing the available evidence and verifying the report received. The article entitled “Identification of the Presence of Pumice Stone Based on Georadar Data and Geoelectric Resistivity Data in Ampenan District and Sekarbela District, Mataram City” published in Jurnal Ilmu Fisika, Vol. 17 No. 1 (March 2025), was found to have a similarity level of approximately 94% with another article previously published in Lambda: Jurnal Pendidikan MIPA dan Aplikasinya, Vol. 5 No. 1 (April 2025), titled “Kombinasi Metode Georadar dan Geolistrik Resistivitas untuk Mendeteksi Keberadaan Batu Apung di Kota Mataram.” The research data (Georadar and Geoelectric data) belong to Universitas Mataram and were used without permission from the data owner. Therefore, Arsi et al., as the authors of the article published in Jurnal Ilmu Fisika, are considered to have published the article without authorization from the rightful data owner. As a result, this article has been formally retracted from the Jurnal Ilmu Fisika archive.
Efek Surfaktan pada Stabilitas Nanofluid Nickekl Ferrite Mahmudi, Riyadi Adnan; Yusuf, Akhmad; Sutjahja, Inge Magdalena
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.31-40.2025

Abstract

Nanofluid stability is a critical factor for the effective application of nanofluids in various fields. One simple and effective method to enhance nanofluid stability is through the addition of surfactants. This study examines the effect of different surfactants on the stability of nickel ferrite (NiFe₂O₄)/water nanofluid. The nanofluids were synthesis using the two-step method, and the surfactants investigated inculded oleic acid, polyethylene glycol 400, tetrabutylammonium bromide, gum arabic, and citric acid. Different concentrations for each surfactant were tested by adjusting the nanoparticles-to-surfactant ratio. The suspension stability was evaluated through visual observation, Zeta potential measurements, and thermal conductivity analysis. The most stable NiFe₂O₄/water nanofluid was achieved using citric acid surfactant, with a nanoparticles-to-surfactant volume ratio of 1:0.25, a Zeta potential value of -35.0 mV and an average thermal conductivity of 0.585 ± 0.007 W/m·K. The results of this study are important for developing nanofluid and magnetic nanofluid systems with optimum conductive heat transfer performance.
Ionospheric Irregularities Related to Scintillation During Geomagnetic Storm in March, April, 2023 Over Indonesia Olla, Angelikus; Pote, Fernince Ina; Husin, Asnawi
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.78-87.2025

Abstract

This study aims to analyze ionospheric irregularities in plasma structures on scales above 400 meters–several kilometers associated with scintillation using GPS satellite signal observation techniques. This study was conducted in the Indonesian region during the main phase of a strong category geomagnetic storm on March 23-24 and April 23-24, 2023 using Total Electron Content (TEC) and Rate of TEC Index (ROTI), from GPS receiver observations in Manado (1.34˚N-124.82˚E; -7.91˚S), Kupang (10.16˚S-123.67˚E; -19.38˚S), Bandung (6.9˚S- 107.6˚E; 17.5˚S) and Biak (1.0˚S-136.0˚E; 12.18˚S). The results showed that during the geomagnetic storm on March 23-24, plasma irregularities, characterized by irregularities on a scale of more than 400 meters and evidenced by an increase in ROTI, were largely suppressed at all observation sites except Bandung. Likewise, most stations did not show a substantial increase in ROTI values ​​in the subsequent storm on April 23-24, 2023, indicating continued suppression except for the Manado station. Furthermore, changes in TEC variations in response to the March 23-24 storm indicate that stations in Biak and Manado experienced positive storms (increase in TEC), while stations Bandung and Kupang experienced negative storms (decrease in TEC). In contrast, during the storm on April 23–24, 2023, all locations reported positive storms.
Sintesis Komposit Karbon Aktif TKKSTiO2 dengan Aktivasi Gelombang Mikro untuk Pemurnian Emisi Gas Buang Kendaraan Bermotor Aqni, Wahyu Nur; Nurhanisa, Mega; Dwiria Wahyuni
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.19-30.2025

Abstract

The palm oil plantation industry generates waste besides palm oil products, including empty palm bunch (EPB). This research examines the emission reduction capabilities of motor vehicle exhaust gases using a composite of activated carbon from EPB-AC/TiO2. Surface morphology characterization of the composite is conducted using Brunauer-Emmett-Teller (BET) and Scanning Electron Microscope (SEM). EPB-AC exhibits an average reduction effectiveness of HC gas based on particle size (50, 100, 150, 200 mesh) sequentially at 34.49%, 37.43%, 39.98%, and 43.56%. The average effectiveness of EPB-AC in reducing CO gas sequentially is 70.29%, 71.30%, 72.86%, and 74%. For CO2 gas, EPB-AC has an average reduction sequentially at 52.6%, 54.25%, 56.52%, and 58.54%. On the other hand, the EPB-AC/TiO2 composite exhibits an average reduction effectiveness of HC gas based on particle size sequentially at 42.38%, 43.42%, 45.1%, and 46.57%. The average effectiveness of the EPB-AC/TiO2 composite in reducing CO gas sequentially is 71.24%, 73.52%, 75.54%, and 76.9%. For CO2 gas, the EPB-AC/TiO2 composite has an average reduction sequentially at 54.93%, 54.25%, 59.76%, and 63.05%. Therefore, the best reduction results occur at a particle size of 200 mesh.
Analisis Karakteristik Curah Hujan di Pulau Kalimantan dan Hubungannya pada Fase El-Niño dan IOD Positif Putri Maulida, Nabila; Ariska, Melly; Suhadi, Suhadi; Akhsan, Hamdi
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.88-100.2025

Abstract

This study aims to analyze the characteristics of rainfall in Kalimantan Island during the ENSO and IOD phases using composite method. This study uses ERA5 reanalysis data for the period 1985-2023. The analysis was carried out using Python in Jupyter Notebook Software to visualize rainfall patterns across four seasons (DJF, MAM, JJA, and SON). The results indicate that El Niño events reduce rainfall during the JJA season, with the largest deficit occurring in the southern region of Kalimantan, where rainfall drops to less than 5 mm per season. Conversely, Positive IOD conditions exacerbate drought, resulting in decreased rainfall in the southern and central parts of the island. The combined effects of El Niño and Positive IOD cause an even more significant decline in rainfall, with the dry season experiencing a substantial reduction compared to normal conditions. This study provides important insights for hydrometeorological risk mitigation in Kalimantan, highlighting the need for adaptive management in response to climate variability.
Optimizing Doppler Ultrasound Parameters: The Study of Insonation Angle, PRF, and Dynamic Range in Blood Flow Assessment Oktamuliani, Sri; Ishii, Takuro; Saijo, Yoshifumi
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.53-62.2025

Abstract

Doppler ultrasound is critical in medical diagnostics for evaluating blood flow and detecting vascular conditions. Accurate blood flow velocity measurements depend on insonation angle, Pulse Repetition Frequency (PRF), and dynamic range. This study optimizes these parameters to enhance Doppler ultrasound performance and diagnostic accuracy. A Xario-100 ultrasound machine and the Doppler 403TM flow phantom were used to evaluate the effects of insonation angle, PRF, and dynamic range on measurement accuracy. Insonation angles of 0o and 60o were tested to assess their impact on aliasing and precision. At 0o, significant aliasing occurred, while 90o, aliasing was minimized. PRF settings were adjusted from 14,000 Hz to 17,900 Hz, with higher PRF extending the Nyquist Velocity from 9.8 cm/s to 37.4 cm/s, reducing aliasing and improving high-flow measurement clarity in the dynamic range from 30 dB to 60 dB, with optimal contrast observed at 50 dB. Histogram analysis revealed a balanced pixel intensity distribution at 50 dB, enhancing the Signal-to-Noise Ratio (SNR). The findings demonstrate an insonation angle of 60o, at PRF 17,900 Hz, and a dynamic range of 50 dB optimal Doppler ultrasound performance. Standardizing these parameters can improve diagnostic accuracy, supporting better patient outcomes in clinical practice.
Freeze-Thawed PVA Hydrogel Loaded by Morinda Citrifolia L. Leaves Extract with Physical and In-Vitro Antibacterial Properties Kusjuriansah, Kusjuriansah; Mufti, Ade; Nilva Tulhana, Fauzah; Fauziah, Dinny
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.63-77.2025

Abstract

Morinda citrifolia L. leaves extract (MCLE) has been used as a medical material because of its antibacterial properties. Hydrogels synthesized from polyvinyl alcohol (PVA) are known to be applicable as delivery media for antibacterial substances. This article reports using the freeze-thaw method to use PVA hydrogel as an encapsulation medium for MCLE. PVA/MCLE hydrogel was synthesized in several combinations, namely 10:0, 10:1, 10:2, 10:3, 10:4, and 10:5. The test results showed the conductivity and pH values of the precursor solution ​​increased as the extract fraction increased, but decreased in the viscosity. The hydrogel showed a morphology with increased pore size when the extract fraction in the hydrogel increased. FTIR characterization confirmed that the extract had been successfully loaded into the hydrogel. The swelling degree test of the hydrogels showed an increase for samples 10:1 to 10:3 and a decrease for samples 10:4 to 10:5. Increasing the extract fraction then resulted in a decrease in the gel fraction of the hydrogel. The antibacterial activity test confirmed that the antibacterial activity in the extract remained present after being encapsulated in the hydrogel. Thus, the addition of MCLE affects the performance of the hydrogels to be applied in the medical field.
Structural Evolution and Ionic Conductivity of Al2O3-Doped LLZO via Single Heat Treatment Yuniarti, Endah; Priyono, Slamet; Sindhu Hendradjaja, Simon; Setiawan, Jan; Prijono, Kusdi; Femlee R, Brity
Jurnal Ilmu Fisika Vol 17 No 2 (2025): September 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.2.157-170.2025

Abstract

This study investigates the synthesis via solid state reaction and characterization of Li₇La₃Zr₂O₁₂ (LLZO) as a solid electrolyte doped with Al₂O₃ using a one-step heat treatment (sintering at 900°C for 4 hours). Samples were prepared with doping variations; pure LLZO (0Al-LLZO), 0.25Al-LLZO, and 0.5Al-LLZO, based on the formula  with x = 0, 0.25, and 0.5, and were mixed using ball milling for 4 hours at 25 Hz. XRD and Rietveld refinement confirmed the formation of a dominant tetragonal Li₇La₃Zr₂O₁₂ phase alongside minor secondary phases. Grain sizes ranged from 1.2 to 1.3 µm, and densification improved with increasing Al content. The 0.25Al-LLZO sample exhibited the highest ionic conductivity of 2.83 × 10⁻⁹ S/cm at room temperature, representing a 2.96-fold increase over undoped LLZO. These results indicate that Al doping significantly enhances structural stability and Li-ion transport in LLZO electrolytes processed at moderate temperatures.
Sifat Fotoluminisensi Nanokomposit ZnO/GQD (Grafen Quantum Dot) Zelin, Hikmatul Gusti Fadhia; Astuti, Astuti
Jurnal Ilmu Fisika Vol 17 No 1 (2025): March 2025
Publisher : Jurusan Fisika FMIPA Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.17.1.101-109.2025

Abstract

The synthesis of ZnO/GQD nanocomposites aims to increase ZnO photoluminescence by conjugating techniques with other luminescent materials, namely graphene quantum dot (GQD). This material is applied as a bioimaging material. ZnO nanoparticles were conjugated with variations of GQD, namely (0.001 g, 0.0015 g, 0.002 g) by hydrothermal method. The results of characterization of ZnO/GQD nanocomposites using XRD show the formation of a hexagonal wurzite structure of ZnO, there is no change in the crystal structure of ZnO, while GQD has an orthorhombic crystal structure. Photoluminescence shows the highest visible light emission peak of ZnO nanoparticles at a wavelength of 620 nm which produces bright yellow luminescence. ZnO/GQD nanocomposites (0.001 g, 0.0015 g, 0.002 g) produced the highest photoluminescence peaks at wavelengths of 550 nm, 590 nm, and 580 nm, respectively. From the PL results, it can be concluded that there was an increase in the photoluminescence intensity with the addition of a small amount of GQD, namely 0.001 g, and there was a shift in the photoluminescence peak towards short wavelengths. This proves that the photoluminescence characteristics of ZnO can be controlled by conjugation with GQDs. Nanocomposites ZnO/GQD potential to be developed as bioimaging material.

Page 43 of 45 | Total Record : 449

 41   42   43   44   45 

Filter by Year

2009 2026


Reset
Filter By Issues
All Issue Vol 18 No 1 (2026): March 2026 Vol 17 No 2 (2025): September 2025 Vol 17 No 1 (2025): March 2025 Vol 16 No 2 (2024): September 2024 Vol 16 No 1 (2024): March 2024 Vol 15 No 2 (2023): September 2023 Vol 15 No 1 (2023): March 2023 Vol 14 No 2 (2022): September 2022 Vol 14, No 1 (2022): In progress (March 2022) Vol 14 No 1 (2022): March 2022 Vol 13 No 2 (2021): September 2021 Vol 13, No 2 (2021): September 2021 Vol 13, No 2 (2021): Published in September 2021 (COMING ISSUE) Vol 13, No 1 (2021): Published in March 2021 Vol 13 No 1 (2021): March 2021 Vol 12 No 2 (2020): September 2020 Vol 12, No 2 (2020): Published in September 2020 Vol 12 No 1 (2020): March 2020 Vol 12, No 1 (2020): Published in March 2020 Vol 11, No 2 (2019): Published in September 2019 Vol 11 No 2 (2019): September 2019 Vol 11, No 1 (2019): Published in March 2019 Vol 11 No 1 (2019): March 2019 Vol 10, No 2 (2018): Published in September 2018 Vol 10 No 2 (2018): September 2018 Vol 10, No 1 (2018): Published in March 2018 Vol 10 No 1 (2018): March 2018 Vol 9 No 2 (2017): September 2017 Vol 9, No 2 (2017): Published in September 2017 Vol 9 No 1 (2017): March 2017 Vol 9, No 1 (2017): Published in March 2017 Vol 8 No 2 (2016): September 2016 Vol 8 No 1 (2016): March 2016 Vol 8, No 2 (2016): JURNAL ILMU FISIKA Vol 8, No 1 (2016): JURNAL ILMU FISIKA Vol 7 No 2 (2015): September 2015 Vol 7 No 1 (2015): March 2015 Vol 7, No 2 (2015): JURNAL ILMU FISIKA Vol 7, No 1 (2015): JURNAL ILMU FISIKA Vol 6 No 2 (2014): September 2014 Vol 6 No 1 (2014): March 2014 Vol 6, No 2 (2014): JURNAL ILMU FISIKA Vol 6, No 1 (2014): JURNAL ILMU FISIKA Vol 5 No 2 (2013): September 2013 Vol 5 No 1 (2013): March 2013 Vol 5, No 2 (2013): JURNAL ILMU FISIKA Vol 5, No 1 (2013): JURNAL ILMU FISIKA Vol 4 No 2 (2012): September 2012 Vol 4 No 1 (2012): March 2012 Vol 4, No 2 (2012): JURNAL ILMU FISIKA Vol 4, No 1 (2012): JURNAL ILMU FISIKA Vol 3 No 2 (2011): September 2011 Vol 3 No 1 (2011): March 2011 Vol 3, No 2 (2011): JURNAL ILMU FISIKA Vol 3, No 1 (2011): JURNAL ILMU FISIKA Vol 2 No 2 (2010): September 2010 Vol 2 No 1 (2010): March 2010 Vol 2, No 2 (2010): JURNAL ILMU FISIKA Vol 2, No 1 (2010): JURNAL ILMU FISIKA Vol 1 No 2 (2009): September 2009 Vol 1 No 1 (2009): March 2009 Vol 1, No 2 (2009): JURNAL ILMU FISIKA Vol 1, No 1 (2009): JURNAL ILMU FISIKA Vol 1, No 1 (2009): JURNAL ILMU FISIKA More Issue