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JFA (Jurnal Fisika dan Aplikasinya)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 1858036X     EISSN : 24604682     DOI : -
Core Subject : Science,
Physics
JFA (Jurnal Fisika dan Aplikasinya, Abbreviation: J.Fis. dan Apl.) hanya menerbitkan artikel penelitian asli serta mengulas artikel tentang topik seputar bidang fisika (fisika teori, material, optik, instrumentasi, geofisika) dan aplikasinya. Naskah yang dikirimkan ke JFA belum pernah diterbitkan ditempat lain serta tidak dalam proses pertimbangan untuk diterbitkan ditempat lain, dalam bahasa apapun. Studi teoritis, eksperimental, dan praktis sama-sama didorong, seperti juga artikel interdisipliner dan yang timbul dari penelitian dan kolaborasi industri.
Arjuna Subject : -
Articles 423 Documents
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Crystalline Properties of Cassava (Manihot esculenta Crantz) Starch and Its Associated Biofoam Philipus J Patty; Synodalia C Wattimena
Jurnal Fisika dan Aplikasinya Vol 19, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.16576

Abstract

Making foam using starch as an alternative material to replace a conventional material, polystyrene, is one of the solutions to solve an environmental problem due to the waste of foam made from polystyrene cannot be degraded. This study aims to analyze the crystalline properties of cassava starch and biofoam made from it using X-ray diffraction (XRD) spectroscopy. From the XRD data of cassava starch, the peaks of 2θ were analyzed to determine the type of cassava starch used in this study. The index of crystallinity of both cassava starch and its associated biofoam was calculated from XRD data. XRD data of cassava starch show 4 main peaks of 2θ: 15.0◦ , 17.0◦ , 17.9◦ , and 23.0◦ , and 3 minor peaks at 11.0◦ , 20.0◦ , 26.0◦ . Based on the main peaks from this XRD data, cassava starch can be categorized as an A-type starch. For cassava starch biofoam, there is only 1 main peak of 2θ at 19.7◦ , and 5 minor peaks at 11.0◦ , 15.4◦ , 21.7◦ , 23.0◦ , and 26.4◦ . The decrease in the crystallinity from the starch to the associated biofoam is shown by the decrease in the index of crystallinity, which decreases from 41.0% in starch to 28.3% in biofoam.
Effect of Rossby and Kelvin Waves on Intensification and Lifetime of Tropical Cyclones in the Western Pacific Abdilah, Syaidi; Sagita, Novvria
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.14339

Abstract

Tropical cyclone is a meteorological phenomenon that occurs on the synoptic scale to the meso scale originating from tropical waters. Weather variability in the tropics can be affected by the Equatorial Planetary Wave (EPW). Identification of the active phase of the EPW wave is done by using a filter on the daily OLR anomaly data in the period of TC occurrence for 5 years which aims to determine the EPW wave in modulating the intensity and lifetime of the TC. The results showed that the EPW wave modulated the TC frequency by 92% of all cases for 5 years in the Western Pacific Ocean which tended to be modulated by the Rossby wave by 45%. While CCEWs modulate TC by 36%, and Kelvin waves modulate TC by 11%. 70% of TCs have lifetimes more than equal to the average indicating that EPW waves modulate TC lifetimes. The global circulation pattern in the study area during the period of occurrence of TC modulated by EPW waves within a period of 5 years shows a cyclonal pattern and maximum wind intensity of more than 40 knots in the 850 hPa layer which supports the formation of TC genesis in the study area.
Influence of adding a convex lens as a solar concentrator on the performance of solar cooker with an octagonal panel Siswoyo, Nurul Amalia silviyanti
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.15551

Abstract

Currently, the two most popular renewable energy is solar power and wind power. However, solar power can be harvested almost in every region for a whole year during the day because Indonesia is located at the equator with average daily radiation of 4,8 kWh/m2. One way to use solar power is used in a solar cooker. The octagonal solar cooker is combine of box type solar cooker and panel type solar cooker. The box part is made of a zincalume with a half-cylinder shape as a reflector from the octagonal reflector to the cooking tray. An addition of convex lens put under the cooking tray. In each cooking tray, 500 mL of water was placed, and the sun's radiation heated the water. Performance of solar cooker tested at 09.00 in the morning for two and half hour or 180 minute . The results show that adding four convex lenses improved the solar cooker's performance, allowing the highest temperature to rise to 86 °C and increasing efficiency to 15.9%. In comparison to an addition, only one convex lens raises the temperature to 84,3 °C with a 15.4% efficiency, while the temperature without the lens rises to 70 °C with an 11.4% efficiency.
WRF-ARW Numerical Model Sensitivity Test on Simulation of Loud Rain in The South Kalimantan Area Al Habib, Abdul Hamid; Firdiyanto, Resa Agna
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.17421

Abstract

On January 13-14, 2021, there was heavy rain in the South Kalimantan region, causing more than 10,000 houses and the main provincial road to be flooded, and also 2 main bridges collapsed. Based on observations at the Syamsudin Noor Meteorological Station Banjarmasin, the rainfall values on January 13 and 14 2021 were 51 mm and 249 mm, respectively. Meanwhile, at the Banjarbaru Climatology Station, it was recorded on January 13-14, 2021, at 45.9 mm and 255.3 mm, respectively. The amount of rainfall recorded at the Banjarmasin Meteorological Station and Banjarbaru Climatology Station makes this condition interesting to study. This simulation uses FNL data with temporal and spatial resolution of 3 hours and 1°×1°, respectively. In this study, the downscaling stage was carried out 2 times with domain 1 of 16 km and domain 2 of 6 km. Furthermore, the input data is running by testing as many as 9 parameterization schemes. Based on the results of the WRF rainfall output with the microphysics scheme (Kessler), the PBL scheme (Yonsei University Scheme) and the cumulus scheme (Kain-Fritcsh) showed the best value and the smallest error value compared to the other 8 schemes. Based on the CAPE value and air humidity, it proves that the atmospheric conditions are unstable and there is significant growth of convective clouds in the South Kalimantan region. The results of the stremaline analysis also show the presence of strong wind bends that result in the accumulation of air masses and indications of orographic rain in the west of the Meratus Mountains.
Effect of zinc ion substitution on sodium-nickel-manganese materials as cathode materials Izaak, Maya Puspitasari; Gunanto, Yohanes Edi; Sitompul, Henni; Purwamargapratala, Yustinus
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.16687

Abstract

Sodium is one of the new materials to replace Lithium in battery manufacture. For this reason, further research is needed to explore this new material and its composition that meets the cathode material standards. This research aims to synthesize and characterize the Sodium-Nickel-Manganese material with the Zn2+ combination, which is expected to be used as a battery cathode material. The characterization used is XRD, SEM, and LCR-meter. In this research, we succeeded in synthesizing and characterizing Sodium-Nickel-Manganese material with a particle size of around 250-500 nm. Characterization using an LCR meter obtained conductivity values of 6.77 ×10-6,7.46×10-4 and 5.45×10-2S/cm at 100 Hz, 1.86 ×10-6,8.75×10-4 and 1.16 S/cm at 1.5 KHz, 1.7 ×10-6,9.45×10-4 and 1.51 S/cm at 3 KHz, for Zn2+ substitution with x=0.1, 0.15, and 0.20, respectively.
Design of an Optical Rotation Value Measurement Tool Using an Arduino Device prayogi, soni
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.15555

Abstract

Malus' law asserts that the square of the cosine of the angle formed between two polarizers is directly proportional to the intensity of light after passing through them. In this study, we demonstrate this law using a straightforward configuration. Our method of measuring the polarizer's rotational angle while keeping the other polarizer stationary is innovative. It involves manually attaching a multi-turn potentiometer to one of the polarizers. The Arduino board is connected to the potentiometer and light sensor that is used to detect the intensity of transmitted light, allowing for the measurement of light intensity as a function of rotational angle. Additionally, we think that the configuration as it is now can be helpful in physics laboratory classes. It can also be demonstrated by using it during lectures
Light Spectrum Speckle Analysis in Roughness Material Identification by Using Naïve Bayes Classifier Based Equalization Histogram Adaptive Bustomi, Muhammad Arief; Utama, Edwin Widya; Purwanti, Endah
Jurnal Fisika dan Aplikasinya Vol 19, No 3 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.18482

Abstract

Speckle imaging is a method that has been used in various fields. This method can be used to analyze the surface roughness of an object. Speckle imaging uses laser light and observes speckle patterns formed from light interference on the surface. The speckle imaging method is very safe and does not require any contact so it is easy to detect the roughness of an object. In this research, two types of sandpaper were used as rough surface objects. Speckle images of the sandpaper surface were created using three laser diodes with different wavelengths, namely 405 nm, 550 nm, and 650 nm. Image processing in this research begins with pre-processing methods, image segmentation, feature extraction, and then the classification process. The feature extraction process uses an Adaptive Histogram. The classification process uses the Naïve Bayes classifier method. Based on the research results, it was found that variations in the wavelength of the light spectrum affect the results of the Adaptive Histogram image features. The accuracy of Naïve Bayes classification increases if the wavelength used in creating the speckle image is shorter. Identification accuracy increased from 92% to 96% due to the use of speckle images resulting from diode laser irradiation from 650 nm to 405 nm.
ESTIMATION OF GROUNDWATER USING THE RESISTIVITY GEOELECTRIC METHOD OF WENNER SCHLUMBERGER CONFIGURATION IN PLALANGAN VILLAGE, KALISAT SUBDISTRICT, JEMBER Sa'diah, Aminatus; Anggraeni, Firdha Kusuma Ayu; Yushardi, Yushardi
Jurnal Fisika dan Aplikasinya Vol 20, No 3 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i3.20281

Abstract

Water is a source of basic needs that is needed by all living things including humans. Palalangan Village, Kalisat Subdistrict is one of the areas that often experiences drought during the dry season, resulting in a water crisis that will hamper the daily activities of the population. The purpose of this study is to determine the subsurface lithological structure based on rock resistivity values and groundwater potential using the resistivity geoelectric method in Palalangan Village, Kalisat District. The research was conducted experimentally in the field using the wenner-schlumberger configuration resistivity geoelectric method to obtain primary data in the form of field measurement data and collect relevant literature studies to obtain secondary data. The results showed that from the first pass to the fifth pass consisted of groundwater material, sandstone, claystone, passive silt soil, gravel, sand, and dry gravel. The potential for groundwater with a considerable amount is found in track 5 which is thought to contain groundwater material with a resistivity value of 6 05 Ωm - 25.7 Ωm at a depth of 1m to 13.8m. This can be seen from the density of the blue color produced through data interpretation
Electrical Properties of Microporous Carbon from Biomass Wood; Tamarind, Mahogany, Teak, and Coconut Shell Mashuri, M; Karim, Cindy C; Fauziyah, A; Suyatno, S
Jurnal Fisika dan Aplikasinya Vol 20, No 1 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i1.20759

Abstract

Microporous carbon has been successfully synthesized from biomass, namely Tamarind Wood (Tamarindus Indica), Mahogany Wood (Swietenia Mahagoni), Teak Wood (Tectona Grandis), and Coconut Shell (Cocos Nucifera). Microporous carbon was synthesized using the carbonization method at 600°C for 45 minutes and washed using an ultrasonic cleaner for 6 hours. Next, the micro-porous carbon powder is dried in the sun and grinded mechanically. Microporous carbon powder was characterized by phase, average particles size, gap energy and electrical conductivity using XRD, PSA, UV-vis and LCR meters. The characterization results show that microporous carbon in the rGO (reduced graphene oxide) phase with a (002) reflection plane in an amorphous carbon graphite structure, the average particle size of Tamarind Wood (8.068 µm), Mahagony Wood (4.409 µm), Teak Wood (3.902 µm) and Coconut shell (3.653 µm). The gap energy measurement results show respectively 1.491 eV, 1.771 eV, 1.821 eV and 2.342 eV with an electrical conductivity value of 142.1×10-2 S/m, 1.281×10-2 S/m, 0.962×10-2 S/m, 0.771×10-2 S/m respectively Coconut shell, Teak Wood, Mahogany Wood, and Tamarind Wood. This microporous carbon-based wood biomass is semiconductors that have the potential as environmentally friendly energy storage supercapacitor materials.
Optimization of Low-Dose Pediatric Chest CT Examination: Pediatric Phantom Study Miftahuddin, Dafa; Prayitno, Audiena Gelung; Hariyanto, Aditya Prayugo; Pontjowijono, Djuli; Endarko, Endarko
Jurnal Fisika dan Aplikasinya Vol 20, No 1 (2024)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v20i1.19814

Abstract

This study uses a Pediatric Thoracic phantom developed in-house to optimize low-dose pediatric chest CT examinations based on organ-specific dose and image quality. Four low-dose protocols, low kV and low mA, reconstructed using Filtered Back Projection (FBP) and iterative reconstruction (IR) algorithms, were investigated. Lung, heart, and spinal cord doses were measured using calibrated Gafchromic LD-V1 Film. Evaluation of image spatial resolution and noise are considered. The CTDIvol results underestimate organ-specific doses. Low kV exposed an average dose of 29.55% less than low mA. No significant differences existed in the MTF curves of standard, low mA, or low kV doses. The peak NPS for low kV is significantly higher than for low mA. The combination of low kV and FBP produces images with better high spatial resolution. Meanwhile, combining low mA with an IR algorithm effectively reduces image noise so that low-contrast object detection improves.

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