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INDONESIA
INDONESIAN JOURNAL OF APPLIED PHYSICS
Published by Universitas Sebelas Maret
ISSN : 20890133     EISSN : 24776416     DOI : -
Core Subject : Science,
Astronomy Energy Materials Science & Nanotechnology Physics
Indonesia Journal of Apllied Physics provides rapid publication of short reports and important research in all fields of physics. Indonesia Journal of Apllied Physics publishes articles that are of significance in their respective fields whilst also contributing to the disclipline of physics as a whole. Articles should be submitted to the Editorial Office of Indonesia Journal of Apllied Physics through this site. Further information on submission is also available at this site
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Articles 7 Documents
 1 
Search results for , issue "Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023" : 7 Documents clear
Performance Enhancement of Biobattery from Tropical Almond Paste Using Acetic Acid Addition Graziani Rumbino; Lili Maniambo; Melfi Soll; Gemala Dirgantari; Octolia Togibasa
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.61245

Abstract

Biobattery is an alternative energy device that uses organic waste without hazardous chemicals. It is further reported that tropical almond (Terminalia catappa L.) is rich in glucose content, making it a potential electrolyte for a biobattery device, although the power performance is not optimal. Therefore, this research aims to improve the performance of biobattery from tropical almond paste with the addition of acetic acid. Biobattery cells were constructed using the galvanic cell method, while the tropical almond paste as an electrolyte was stored in a box container with a volume of 600 cm³, then attached with copper and zinc metal plate as cathode and anode. Five typical devices of biobattery were made with various acid concentrations of 0%, 10%, 20%, 40%, and 80% which were added to the electrolyte. The results showed a significant enhancement of power performance, from 0.25 mW without any acid up to 1.62 mW with acid addition. The biobattery from tropical almond paste added with acetic acid of 20% had the best performance. Based on the results, the characterization of this device had an open cell voltage of 0.93, and the power curve showed a peak value of 1.62 mW at a current of 3.29 mA, with a stable current lasting up to 200 hr.
Kajian Teoritik Persamaan Diferensial Stokastik bagi Kurs Mata Uang (Forex), Kajian Khusus : Kurs IDR/USD Isa Isnawanti; Dwi Satya Palupi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.52916

Abstract

Telah dilakukan kajian persamaan diferensial stokastik bagi pergerakan kurs mata uang. Kajian terhadap rapat peluang return perlu dilakukan karena rapat peluang return menggambarkan fluktuasi kurs mata uang serta mencerminkan interaksi yang terjadi di pasar keuangan. Pada penelitian ini return kurs mata uang diasumsikan mengikuti proses stokastik yang dapat digambarkan oleh suatu persamaan diferensial stokastik, sehingga distribusi rapat peluang return dapat digambarkan oleh persamaan Fokker-Planck. Data yang digunakan pada penelitian ini adalah kurs mata uang IDR/USD dari Januari 2001 sampai Januari 2021 yang diperoleh dari data kurs transaksi Bank Sentral Republik Indonesia. Distribusi rapat peluang return harian yang diperoleh mengikuti distribusi Gaussian dengan rata-rata  −0, 0001 dan sigma = 0, 0048. Berdasarkan distribusi tersebut dapat dibentuk persamaan diferensial stokastik bagi return kurs mata uang IDR/USD.
Struktur Bawah Permukaan Pantai Semarang berdasarkan Metode HVSR Muhammad Irham Nurwidyanto; Muhammad Zainuri; Anindya Wirasatrya; Gatot Yuliyanto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.66864

Abstract

The aim of this study was to obtain a profile for each depth of the subsurface structure of the Semarang coast based on microtremor data. The acquisition of 109 data points in this study was taken using a single-station microtremor tool in the coastal area of Semarang. This study uses the HVSR method to produce the HV curve, amplification factor (A0) and dominant frequency (f0) which can later be used to find the values of vp, vs and vp/vs at each depth. The results obtained in this study include A0 of 0.13 - 5.96, f0 of 0.13 - 7.47 Hz, vs of 154.42 - 1444.404 m/s, vp of 266.40 - 4758.37 m/s and vp/vs of 1,421 – 28,674. Based on the vs analysis, bedrock begins to appear at a depth of 100 m in the eastern and southern parts of West Semarang District and the southern part of North Semarang District. Classification of hard soil, very dense and soft rock from a depth of 100 m shows that it has covered most of the area of Semarang City. However, there are still several areas that still have a medium soil classification, namely most of the areas of Gayamsari District, Genuk District and Pedurungan District, as well as a small part of the area of North Semarang District, West Semarang District and Central Semarang District. Analysis of vp/vs at a depth of 150 m showed a vp/vs classification with a range of 1.4 - 2 in the study area. However, there are still several areas that still have vp/vs values with a value range of 3 – 3.2, namely in the northern part of West Semarang District, eastern Central Semarang District, eastern South Semarang District, northern East Semarang District, northern Gayamsari District, and the central part of Genuk District.
Karakteristik Antibakteri Nanoceria-Kitosan yang disintesis menggunakan Metode Presipitasi Muhammad Danu Rizkia; Iis Nurhasanah
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.55546

Abstract

CeO2 nanoparticles (nanoceria) is a material that posseses antibacterial activity. In this study, nanoceria was combined with chitosan to increase its antibacterial property. The formation of nanoceria-chitosan was analyzed using X-ray diffractometer, Fourier Transform Infrared (FTIR) and UV-Vis Spectrophotometer. The antibacterial activity of nanoceria-chitosan was tested using the disc diffusion method on Escherichia coli bacteria. X-ray diffraction pattern analysis showed that nanoceria-chitosan has a cubic structure. The incorporation of chitosan in nanoceria was identified at a wave number of 2919 cm-1 from the FTIR spectrum. Nanoceria-chitosan showed a smaller crystallite size, a larger energy band gap and better antibacterial activity than nanoceria.
The Estimation of Fracture Intensity and Pressure Distribution using Analysis of Shear Wave Splitting on “Landak” Geothermal Field Muhammad Al Thariqsyah; Irvan Ramadhan; Sudarmaji Sudarmaji
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.56323

Abstract

Shear wave splitting is a study that utilizes the differences between arrival times of two shear waves (slow and fast) propagating from a source to a receiver to identify the magnitude of the anisotropic medium through which they propagate. Aside from generating a delay time between two shear waves, the anisotropic medium also shifts the polarization of fast shear wave from its initial polarization which is indicated as the main orientation of the related fracture system. The study was conducted on Landak Field, located around Bukit Besar mountain range by analyzing provided data from December 2011 to April 2012. The results of this study show that the polarizations of fast shear waves in several stations are as following; NE-SW orientation at station R09, R17, R25, and R26, N-S orientation at station R08, and NW-SE orientation at station R17. Not only do these orientations of polarization show a good correlation with structural analysis in this area, but also important to be noted that all microseismic stations encounter a wide-spreading polarization phenomenon as an effect of complex anisotropy. The delay time from all stations ranges from  0.03 to 0.07 seconds. The normalization between delay time and length of ray path for all stations results in a fracture intensity parameter ranging from 0.004 to 0.011 seconds/km. This intensity is measured in slowness parameters, which shows increased value towards the Bukit Besar area, which potentially becomes the upflow zone of the geothermal system. The study shows that the distribution of fracture intensity and pressure have correlation and identical trend with temperature distribution.
Identifikasi Daerah Rawan Longsor secara Mikrozonasi di Jalan Alternatif Provinsi menggunakan Metode Simple Additive Weighting (SAW) Darmawan Ikhlas Fadli; Arif Ismul Hadi; Zagita Allifya; Septi Anggriani; Rama Ramdani; Beni Syakban Idris; Refrizon Refrizon
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.62110

Abstract

The alternative provincial in Bengkulu Tengah Regency is located in a location bordering the Musi Fault segment that is part of the Great Sumatran Fault Zone. This condition makes cross-provincial roads in Central Bengkulu Regency vulnerable to natural disasters such as landslides. The purpose of the study was to determine areas that have the potential for landslides in earthquake-prone areas of Central Bengkulu Regency, Bengkulu Province, Indonesia. We performed the HVSR (horizontal to vertical spectral ratio) analysis and the simple additive weighting (SAW) method to achieve the study purpose. Field data acquisition using the PASI Gemini2 broadband seismometer (triaxial geophone). Next, we analyzed the tremor data recorded in the field using a wave spectrum. From the results of this study, we knew that the possibility of landslides in the survey area classified into three categories that is low, medium and high. Landslide risk should be paid more attention in areas with high potential, especially in densely populated areas. The main threat in the study area is an earthquake along the active Sumatran fault. Earthquakes in areas that are very steep and prone to landslides can increase the risk and cause landslides.
A Brief Study of Methods to Determine the Electrical Resistivity of Materials Inzamam Khalid
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.64742

Abstract

Present study deals with the study of methods to calculate the resistivity of materials. Different methods are discussed which determine the resistivity of specific materials on the basis of their shapes and sizes.  Their working, structure, advantages and loopholes are discussed in a brief manner. Materials are categorized according to their magnitude of resistivity. The two probe method is helpful in measuring the resistivity of high resistive samples while four probe methods can be used for materials with low resistance. Pulse probe method measures the resistivity of materials having small physical dimensions. The Montgomery method is useful in finding the individual resistivities of anisotropic materials.

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