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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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A Review - Does Low Magnitude High-Frequency Vibration (LMHFV)Worth for Fracture Recovery Compared with Pulsed Electromagnetic Field (PEMF) Based Magnetotherapy Method? Evi Suaebah; Rohim Aminullah Firdaus; Muhimmatul Khoiro
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14213

Abstract

The subject of electromagnetic fields is widespread today, including in the medical world. One of them is therapy in fracture healing using the Pulsed Electromagnetic Field (PEMF) method by utilizing a magnetic field. Fracture healing using the magnetic field method utilizes the Helmholtz coil, which is influenced by the current and the amount of turns flowing in the magnetic field. This study conducted a literature study on fracture healing using the PEMF and the LMHFV methods. A comparison of these two methods will show different healing effects. From the studies, we can conclude which way has the most advantage in healing. A faster rehabilitation process will have an impact on reducing implant failure. In contrast, Applying the LMHFV method to bone fractures gives more significant and faster results in bone formation in the damaged part, and the healing process is owned faster. From these two methods, it can be concluded that the LMHFV method provides a similar healing effect than the PEMF method. Applying the LMHFV and PEMF method to bone fractures gives more significant and faster results in bone formation in the damaged part. In addition, the healing process is owned faster.
Structure Identification of Nanopowder TiO2 Synthesized by Coprecipitation Method Vicran Zharvan; Gatut Yudoyono; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.15475

Abstract

Titanium dioxide, or TiO2 is a semiconductor material with many advanced applications, such as photocatalysts. Generally, TiO2 has three primary forms of crystal structure: anatase, brookite, and rutile. Among these types of crystal structures, anatase has good properties in photocatalysts application due to its band gap value (3.20eV) and stability. Further, there are many methods to synthesize TiO2, such as sol-gel, hydrothermal method, etc. Still, the copreciptation method has a suitable method because it is easy to produce, high pure product and low cost. However, many parameters control the quality of TiO2 itself: pH, temperature, time and mechanical process. Especially for the mechanical process, no results were reported about structure identification of TiO2 at mixing time below 25 hours. In this research, titanium dioxide (TiO2) powder has been investigated using coprecipitation method and TiCl3 as a raw material. The TiO2 was synthesized by mixing the time duration at 5, 10 and 25 hours in this method. Analysis using x-ray diffraction shows that all the samples have an anatase phase. Further, Rietveld refinement analysis shows that mixing duration time does not significantly affect the lattice parameters.
The Use of Zinc Oxide (ZnO) Photocatalyst for Photodegradation of Car Wash Wastewater Abd Mujahid Hamdan; Rauza Azkiya; Arief Rahman; Mailiza Efriana; Rahmad Maulana; Hanif Hanif
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14019

Abstract

Untreated motor vehicle waste has the potential to damage the environment. The photodegradation method can decompose pollutants with the help of UV-A light and photocatalysts. Zinc Oxide (ZnO) is a photocatalyst capable of degrading motor vehicle washing waste. This study aims to investigate the ability of ZnO as a photocatalyst in degrading pollutants in motor vehicle waste. The independent variables in the experiment were the mass of ZnO and the contact time. The variables used were mass 0.5, 0.75, and 1 gram with a contact time of 2, 3, and 4 hours. The experimental results showed that ZnO irradiated with UV-A lamp was able to degrade organic substances. The mass and contact time of ZnO affect the effectiveness of photodegradation. These results show that the use of ZnO photocatalyst for photodegradation of Carwash Wastewater may be future technology to treat car wash wastewater.
Characterization of Cough Sounds Based on Measured Sound Pressure Levels from Arduino-Based MAX9814 Sound Sensor Aris widodo; Muktamar Cholifah Aisiyah
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14432

Abstract

Research has been conducted on the characterization of coughing sounds based on the measured sound pressure level of the Arduino-based MAX9814 sound sensor to determine the characteristics of coughing sounds based on the Sound Pressure Level (SPL). This research method is carried out by designing sound sensor hardware and software using the MAX9814 sound sensor. After that, recording the coughing sound data from the cough voice coswara respondent data set using a sound sensor and converting it to SPL data. After that, the cough SPL data was analyzed from the SPL cycle graph during recording and the cough phase pattern. And the resulting characterization of coughing sound based on coughing pressure using an Arduino-based MAX9814 sound sensor produced a coughing sound character in terms of sound pressure level (SPL) based on the expulsive phase and the intermediate phase of coughing. The expulsive phase indicator is emphasized the intensity of occurrence and density in one cycle of recording coughing sounds. And for the intermediate phase based on the drop rate of the SPL back to the SPL position without coughing. The SPL of cough detected by the MAX9814 sound sensor is ±80dB.  
Natural Dyes Extraction of Curcuma Longa, Tradescantia Spatacea, and Bryophyta Absorption Capability on TiO2 Nanofiber Thin Layer Novita Asma Ilahi; Fadillah Hazrina; Afrizal Abdi Musyafiq; Ahmad Aftah Syukro; Erliza Septia Nagara
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14068

Abstract

Exploration of plant variations is required to determine the absorbance ability and potential utilization of dye in the development of Dye-Sensitized Solar Cells (DSSC). Extraction of four different plants was carried out to obtain three different types of natural dyes. The curcumin dye was obtained from the extraction of Curcuma longa, the chlorophyl dye was obtained from the extraction of Bryophytes, the anthocyanin dye was obtained from the extraction of Brassica oleracea var capitata f. rubra, and Tradescantia spathacea. The research was conducted to determine the absorbance capability of each different type of dye and the image of the thin layer of TiO2 nanofiber used by DSSC. Extraction is carried out through a drying and pounding process. The powder of each plant was then synthesized using ethanol through a homogenization process for 12 hours. The research utilizes a spectrophotometer UV-Visible to determine the wavelength of the natural dye, as well as a scanning electron microscope (SEM) to determine the size of the titanium dioxide (TiO2) thin film nanofiber based on the displayed image. DSSC utilizes TiO2 nanofiber as a thin layer of semiconductor. The dye absorption peak is in the wavelength range of 350-500 nm and 650-700 nm. Based on the analysis of absorbance results, curcumin dye has the greatest potential to be used in DSSC with the highest absorption ability in all its occurrences at visible light wavelengths.
Effects of The Addition of Carbon on Abaca Fiber and PVA Composite Materials Based on Mechanical and Acoustic Properties Susilo Indrawati; Syabania R A; Linda Silvia; Lila Yuwana; Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14534

Abstract

Abaca is a kind of banana that grows in Indonesia. Abaca banana product utilized in this research is a fiber that obtained from the midrib of the stem. Henceforth, abaca fiber is processed to be the form of membranes. The purpose of the study are to determine the physical, mechanical and acoustic properties of abaca fiber composite materials as fillers and polyvinyl acetate (PVA) as a matrix. The ratio of composite materials of abaca fibers and PVA is 1:10. The variations used in producing membranes are the addition of carbon powders by 0%, 2%, 4%, 6% and 8%. The characteristics carried out include testing of density, morphology, tensile strength and sound absorption coefficient. The results reveal that the highest density is obtained from the sample of 0% carbon, i.e., 1.026 gr/cm3. Furthermore, the mechanical properties testing shows the highest yield stress value in samples with 4% carbon of 476.8 MPa and the highest Young modulus in samples with 8% carbon is 7905.1 MPa. Therefore, the addition of carbon could improve the mechanical properties of composites materials. Based on the measurement of sound absorption coefficient using an impedance tube with 1 microphone, the highest value can be attained from the sample of 4% carbon, namely 0.211 which shows the sample is more reflective. The material is reflective because the amount of abaca fiber used is less than PVA. The diameter of pores formed between the fiber and PVA are very small which could cause the absorption coefficient value to be lower. Therefore, further research will focus on the addition of abaca fiber content in composite materials. The positive point in this study is that the addition of carbon with 4% and 8% provides optimal mechanical ability.
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
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.v19i2.15721

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 90◦ and the maximum hydrophobicity properties of polydimethylsiloxane/silica (PDMS/SiO2) was about 111.40◦ for the silica composition of 2 g.
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
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.v19i2.16145

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.
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
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.v19i2.14045

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
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.v19i2.16559

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.

Page 38 of 43 | Total Record : 423

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