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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 604 Documents
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Influence of Adding a Convex Lens as a Solar Concentrator on the Performance of Solar Cooker with an octagonal panel: Nurul Amalia Silviyanti Siswoyo and Rinaldy Harjo Purnomo Nurul Amalia Silviyanti Siswoyo Nurul Amalia Silviyanti Siswoyo; Rinaldy Harjo Purnomo Rinaldy Harjo Purnomo
Jurnal Fisika dan Aplikasinya Vol 19 No 3 (2023): October 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.3079

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.
Effect of Rossby and Kelvin Waves on Intensification and Lifetime of Tropical Cyclones in the Western Pacific: Syaidi Abdilah, Novvria Sagita Syaidi Abdilah Syaidi Abdilah; Novvria Sagita Novvria Sagita
Jurnal Fisika dan Aplikasinya Vol 19 No 3 (2023): October 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.3080

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.
WRF-ARW Numerical Model Sensitivity Test on Simulation of Loud Rain in The South Kalimantan Area: Abdul Hamid Al Habib, Resa Agna Firdiyanto Abdul Hamid Al Habib Abdul Hamid Al Habib; Resa Agna Firdiyanto Resa Agna Firdiyanto
Jurnal Fisika dan Aplikasinya Vol 19 No 3 (2023): October 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.3081

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.
Effects of Zinc-ion Substitution on the Structure and Electrical Conductivity of Sodium-Nickel-Manganese Materials as Cathode Materials: Maya Puspitasari Izaak, Yohanes Edi Gunanto, Henni Sitompul, Yustinus Purwamargapratala Maya Puspitasari Izaak Maya Puspitasari Izaak; Yohanes Edi Gunanto Yohanes Edi Gunanto; Henni Sitompul Henni Sitompul; Yustinus Purwamargapratala Yustinus Purwamargapratala
Jurnal Fisika dan Aplikasinya Vol 19 No 3 (2023): October 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.3082

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.
Light Spectrum Speckle Analysis in Roughness Material Identification by Using Naïve Bayes Classifier Based Equalization Histogram Adaptive: Muhammad Arief Bustomi, Edwin Widya Utama, Endah Purwanti Muhammad Arief Bustomi Muhammad Arief Bustomi; Edwin Widya Utama Edwin Widya Utama; Endah Purwanti Endah Purwanti
Jurnal Fisika dan Aplikasinya Vol 19 No 3 (2023): October 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i3.3083

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.
Manufacturing of Soil Coefficient Permeability Meter with Data Acquisition System Based on Internet of Things (IoT): Fahrur Aslami, Elysa Nensy Irawan, Melania Suweni Muntini, Dwa Desa Warnana, Ahmad Syahdi Al Khawarizmi Fahrur Aslami Fahrur Aslami; Elysa Nensy Irawan Elysa Nensy Irawan; Melania Suweni Muntini Melania Suweni Muntini; Dwa Desa Warnana Dwa Desa Warnana; Ahmad Syahdi Al Khawarizmi Ahmad Syahdi Al Khawarizmi
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.14045

Abstract

Soil permeability coefficient and measuring instrument using a data acquisition system based on Internet of Things (IoT) has been successfully made. The measuring equipment uses the falling head permeameter concept. MPX10GP sensor is used to measure water level. The measurement range is 6-40 cm water level, to obtain + 36 permeability coefficient value of each 1 cm. The data from the subsequent measurement systems is transmitted into the internet network so that it can be accessed by smartphone. Based on the measurement results of three samples, the slopes of Mount Ngantang have a soil permeability coefficient value of 0.0016 cm/s, the Institut Teknologi Sepuluh Nopember (ITS) pond embankment is 0.0005 cm/s, and the Bengawan Solo River embankment is 0.0002 cm/s. These results match with the reference and the difference value is only 2.7%. By using this research method, it is expected to draw up a map of the area that is prone to landslides quickly and accurately.
Determining the Deposition Rate of Semiconducting Intrinsic Layer Prepared by Nanospray Method: Aulia Anisa Firdaus, Endhah Purwandari, Retno Asih, Ahmad Sholih, Darminto Darminto Aulia Anisa Firdaus Aulia Anisa Firdaus; Endhah Purwandari Endhah Purwandari; Retno Asih Retno Asih; Ahmad Sholih Ahmad Sholih; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.16559

Abstract

Amorphous carbon (a-C) film provides potential ability as an i-type layer in semiconductor material for photovoltaic purposes due to its tunable properties. Here, we investigate how to get the deposition rate estimation of the thickness and homogenous surface of a-C film as an i-type in solar cell applications. The a-C was prepared from palmyra liquid sugar using nebulizer as a nanospray method. The thick palmyra liquid sugar was carbonized at 250 C for 2.5 hours then continued at 300 C for 2 hours to obtain high-carbon charcoal. The thickness was examined using a SEM cross section, and the amorphous phase was measured using XRD. The amorphous characteristic of a-C is confirmed by broad peaks in XRD patterns. The thickness of a-C films was found to be thinner than in a previous study that used a similar materials and methods but different equipment in the deposition process. The average thickness of a-C films is in the range of 200 to 450 nm, followed by an increase in the deposition time of 5 to 25 s. By these value, the deposition rate estimation was obtained using extrapolation linier method from the SEM result around 11.62 nm/s. This result can be used as a reference to make various thicknesses for the i-layer in order to find the maximum thickness that gives high efficiency to amorphous carbon film.
Synthesis of Silica from Rice Husk Waste for Hydrophobic Material as an Anti-Water Coating for Eyeglasses: Phahul Zhemas Zul Nehan, Ahmad Ali Akbar, Muhammad Ilham Nur Karim, Raychan Abyqa Fahriza, Mochamad Zainuri Phahul Zhemas Zul Nehan Phahul Zhemas Zul Nehan; Ahmad Ali Akbar Ahmad Ali Akbar; Muhammad Ilham Nur Karim Muhammad Ilham Nur Karim; Raychan Abyqa Fahriza Raychan Abyqa Fahriza; Mochamad Zainuri Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.15721

Abstract

Hydrophobic materials made of silica as a coating for glasses are very attractive. The synthesis of silica (SiO2) from rice husk ash was successfully carried out using the sol-gel method. The hydrophobic silica composition is made with four variations of silica, consisting of 0.5, 1.0, 1.5, 2.0 g and polydimethylsiloxane (PDMS) keep constant in 20 g. The raw material was first characterized by X-ray Fluorescence (XRF) to investigate element composition. Then, silica powder obtained from rice husk ash was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Particle Size Analyzer (PSA) and Water Contac Angel (WCA) were employed to investigate functional groups material, size of particles and hydrophobicity of the prepared samples for coating glass. The result of contact angel from coating glass exhibited more than 900 and the maximum hydrophobicity properties of polydimethylsiloxane/silica (PDMS/SiO2) was about 111.400 for the silica composition of 2 g.
Crystalline Properties of Cassava (Manihot esculenta Crantz) Starch and Its Associated Biofoam: Philipus J. Patty and Synodalia C. Wattimena Philipus J Patty Philipus J Patty; Synodalia C. Wattimena Synodalia C. Wattimena
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
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

Mini Research: Analyzing the Relationship between Listening to Murottal Al Qur’an Surah Al Baqarah Verses 1-10 to Beta Waves with Learning Concentration: Heni Sumarti, Muhammad Syafiul Huda, Fahira Septiani, Affa Ardhi Saputri, Arifah Riana Heni Sumarti Heni Sumarti; Muhammad Syafiul Huda Muhammad Syafiul Huda; Fahira Septiani Fahira Septiani; Affa Ardhi Saputri Affa Ardhi Saputri; Arifah Riana Arifah Riana
Jurnal Fisika dan Aplikasinya Vol 19 No 2 (2023): June 2023 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.16145

Abstract

Concentration in learning has a big impact on determining learning outcomes. Some of the conditions experienced by students who find it difficult to maintain concentration during the learning process are caused by many factors. Among them is the atmosphere of a noisy learning environment. One way to determine the learning concentration condition is by measuring beta brain waves using Electroencephalography (EEG). This study aims to analyze the effect of the murottal stimulus of Al Baqarah verses 1-10 on beta brain wave activity and its relationship with learning concentration. The research method used is experimental. Subjects in this study were 6 students of UIN Walisongo Semarang, with inclusion criteria ranging from 20-23 years old, Muslim, not hearing impaired, physically and mentally healthy, and not using drugs. The stages of research consisted of 4 stages; first, the research subjects carried out the pre-test without stimulus; second subject measured their brain waves without stimulus; third, subjects measured brain waves with stimulus; and finally, the research subjects carried out the pre-test with stimulus. The analysis results using the T-test, which stated that the average comparison of beta brain waves in the two groups before and after being given the murottal Al-Qur’an stimulus showed a p-value of 0.0003 (p<0.05). While the results of the pre-test and post-test T-test showed a p-value of 0.017 (p<0.05). It shows that the murottal stimulus of Al Baqarah verses 1-10 effects changes in beta waves and the level of learning concentration.

Page 47 of 61 | Total Record : 604

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