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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 6 Documents
 1 
Search results for , issue "Vol 20, No 3 (2024)" : 6 Documents clear
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
Analysis of glucomannan molecule in Porang (Ammorphophallus Muelleri Blume) flour using nuclear magnetic resonance Rizoputra, Ivan; Wahyudi, Sriati; Puspita, Niniek Fajar; Risdiana, Risdiana; Darminto, Darminto
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.v20i3.21753

Abstract

The porang tuber (Ammorphophallus Muelleri Blume) is a bulb plant belonging to the Araceae family, which contains the polysaccharide substance of glucomannan. In this work, the porang flour has been purified from tubers by a centrifugation method. To study the content of compounds and types of molecules that make up glucomannan, characterization was carried out using 1H and 13C nuclear magnetic resonance (NMR). The analysis on chemical shift data from both NMR spectra can be concluded that glucomannan in porang is more dominantly constructed by glucose molecules rather than mannose. From these results, it is also known that the toxic compound Ca-oxalate which is part of the porang compound has been reduced during the centrifugation process.
Analysis of the Effect of Porosity on the Acoustic and Elastic Properties of Materials Using Ultrasonic Immersion Pulse-Echo Technique Maiyena, Sri; Mat Daud, Anis Nazihah; Ayop, Shahrul Kadri
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.v20i3.20656

Abstract

The material properties is an important aspect in determining the potential application of a material. Hence, this study is carried out to determine the effect of porosity on the material properties (acoustic properties and elastic properties) of material using the pulse echo immersion ultrasonic technique. This study comprises of two acoustic properties (longitudinal velocity and acoustic impedance) and five elastic properties (Young's modulus, shear modulus, bulk modulus, longitudinal modulus and Lamé constant). Two types of PMMA samples are used for this study; nonporous sample and porous sample. The result indicated that the material properties (acoustic properties and elastic properties) of porous sample are less than the material properties of non-porous sample. It indicated that the porosity gives significant effect towards the material properties.  
Optimization of Audio System Wireles Transmitter Using Green Laser Puspitasari, Nurrisma; Dwiputra, Adnan Wahyu; Sudarsono, Sudarsono; Yudoyono, Gatut; Prajitno, Gontjang; Indarto, Bachtera
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.v20i3.21861

Abstract

Abstract: Nowadays, many activities are done digitally using wireless technology. Wireless technology is the mainstay of communication, but along with the development of the times, there is a wireless technology that utilizes LASER. There has been quite a lot of research on audio systems with wireless transmitters, but none have analyzed the potential of green lasers to obtain the optimal wavelength for communication. This study aims to design a voice transmission system using a laser, determine the relationship between input voltage and laser light intensity, and compare the output frequency with the input frequency. There are three types of measurements: light intensity and distance, laser diode voltage and intensity, and output frequency compared to input frequency. The audio input signal from the source is modulated and transmitted through a laser light medium. The laser beam is then fired into a receiver circuit that can demodulate the signal which is then sent to the output device in the form of a speaker. The study found that the output frequency had the highest error percentage of 38.70% at 125 Hz and the lowest error percentage of 0.07% at 500 Hz when compared to the input frequency. The biggest mistake comes from the volume dropping at a low frequency. The oscilloscope reading is not accurate due to the smaller volume, which leads to a high deviation value and affects the system performance negatively.
Hydrothermal Identification Based on Rock Resistivity Value Using Dipole-dipole Configuration Geoelectric Method In Lemeu Village, Lebong Regency, Bengkulu Province Zamrawi, Ripal; Suhendra, Suhendra; Halauddin, Halauddin; Rendoza, Rendoza; Putri, Aisyah Cindy Phylia; Gumanty, Usman; Setiawan, Wahyu Cahyadi
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.v20i3.21623

Abstract

Potensi panas bumi identik dengan keberadaan gunung berapi sebagai sumber reservoir, namun sumber hidrotermal jarang ditemukan di tempat yang tidak berasosiasi dengan gunung berapi dan patahan. Salah satu daerah yang terdapat sistem hidrotermal yang berada di Desa Lemeu belum pernah diteliti. Penelitian ini dilaksanakan pada bulan November 2023 dan pengambilan data dilakukan di sekitar sumber air panas Desa Lemeu, Kabupaten Lebong, Provinsi Bengkulu. Penelitian ini menggunakan alat X612-EM VHR MAE MULTICHANNEL Geoelectric RESISTIVIMETER. menggunakan konfigurasi dipol-dipol dengan nilai resistivitas rendah (20,5 Ωm). Nilai resistivitas rendah ini kemungkinan disebabkan oleh sumber hidrotermal. Pada kedalaman 13,4 m, permukaan biasanya didominasi oleh lapisan hidrotermal, sedangkan nilai resistivitas yang relatif tinggi yaitu 8525 Ωm kemungkinan merupakan batuan keras. Berdasarkan hasil interpretasi penampang resistivitas 2D, terdapat sebaran hidrotermal pada garis survei di Desa Lemeu. Air panas tersebut diduga keluar ke permukaan melalui retakan batuan di bawah permukaan. Sehingga air panas mengalir melalui patahan-patahan di dekat daerah tersebut. Suhu udara di daerah tersebut sekitar 30˚-40˚ C. Karena patahan-patahan di sekitarnya cukup jauh, maka udara di daerah tersebut merambat ke permukaan dari patahan terdekat.
Comparison of Supervised Learning Algorithms for Cigarette and Vape Smoke Classification Using Electronic Nose Farghani, Muhammad Agung; Wijayakusuma, Nurul Izzah; Sumanto, Budi
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.v20i3.17939

Abstract

This research discusses applying the Supervised Learning method using Electronic Nose to classify the types of cigarette and vape smoke in the air. Electronic Nose is used as a scent detector that can identify the characteristics of smoke from both sources. Three Supervised Learning algorithms, namely KNN, SVM, and Decision Tree, were applied to compare the performance in classifying smoke types. The data comprised reference air samples, air contaminated by manufactured cigarette smoke, rolled cigarettes, and vape. The results showed that all three Supervised Learning algorithms successfully provided an excellent classification for cigarette and vape smoke types using data from Electronic Nose. The best accuracy result was achieved by SVM, with an accuracy rate of  96.55%. This research contributes to identifying sources of air pollution that have the potential to endanger human health

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