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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 351 Documents
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Pengaruh Ekstrak Kulit Buah Naga Merah dan Daun Trembesi sebagai Penghambat Korosi pada Baja A36 dalam Larutan HCl 3% Evi Yufita; Zulfalina -; Muhammad Ilham Nur; Fatriah Fatriah; Zulkarnain Jalil
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.54625

Abstract

Tumbuhan merupakan salah satu sumber daya alam yang dapat dimanfaatkan sebagai zat inhibitor organik. Inhibitor organik digunakan untuk mengatasi laju korosi terutama pada material yang mengandung logam. Penelitian ini bertujuan untuk mempelajari peluang beberapa ekstrak dari tumbuhan sehingga dapat dimanfaatkan sebagai inhibitor korosi berdasarkan nilai laju korosi dan efesiensi inhibisi. Tumbuhan yang digunakankan adalah buah naga merah (Hylocereus polyrhizus) dan daun trembesi (Samanea saman (Jacq.). Sampel ujinya berupa plat baja hitam A36 berdimensi 3 cm x 1,5 cm x 1,14 mm, dan medium korosif asam klorida (HCl) 3%. Variasi kosentrasi ekstrak inhibitor untuk masing-masing bahan yang ditambahkan ke dalam medium korosif HCl 3% sebesar 2, 4, 6, 8 dan 10 mL. Perhitungan laju korosi menggunakan metode kehilangan berat (weightloss). Dari hasil penelitian, nilai laju korosi terendah untuk inhibitor ekstrak kulit buah naga merah terdapat pada penambahan inhibitor 10 mL sebesar 0,0463 cm/yr dengan efisiensinya 91,89 %. Sedangkan nilai laju korosi terendah untuk inhibitor ektrak daun trembesi terjadi pada penambahan inhibitor 10ml sebesar 0,0066 cm/year dengan efisiensi 98,9 %. Dari hasil penelitian tersebut dapat disimpulkan bahwa kulit buah naga merah dan daun trembesi mampu menurunkan laju korosi yang terjadi pada baja, sehingga memiliki peluang alternatif untuk dijadikan sebagai inhibitor organik.
Characterization of ZnO Nanoparticles Prepared in Curcuma Aromatica Salisb. Root Extract Abdul Kareem Thottoli; Ameera P.I.; Ajitha P.; Vrinda C.; Karamunnisa K.; Thamanna Shaharbanu M.H.; Sajna T.P.; Arshadha K.T.; Islam M Al-Akraa; Ahmad M. Mohammad; Chandramohan S.
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.40934

Abstract

The root extract of the locally available Curcuma Aromatica Salisb. was used with the ZnO precursors to study the effect of the Curcuma Aromatica Salisb.  extract on the growth and optical absorption behaviour of the ZnO nanoparticles. ZnO nanoparticles were synthesized in various concentrations of Curcuma Aromatica Salisb. root extract. X-ray diffraction studies show that the prepared samples consist of nanocrystallites of having sizes in the range between 17 nm to 26 nm. The optical absorption studies reveal that the eco-dying on ZnO nanoparticles using Curcuma Aromatica Salisb. root extract has enhanced the optical absorption behaviour of ZnO to the visible region of the spectrum.
Sintesis dan Karakterisasi MgB2 dengan Penambahan Nano-SiC melalui Metode Reaksi Padat Sigit Dwi Yudanto; Lalu Arif Rahman Hakim; Muhammad Emir Hanif Rasyadi; Agung Imaduddin; Andika Widya Pramono
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.49136

Abstract

Sintesis material MgB2 dengan penambahan nano-SiC telah kami lakukan menggunakan metode reaksi padat. Evaluasi penambahan nano-SiC terhadap struktur kristal dan suhu kritis MgB2 dilakukan melalui pengujian difraksi sinar-X dan cryogenic magnetometer. MgB2+x wt.% nano-SiC dengan x=0, 5, 10, dan 15 dipersiapkan dengan penggerusan manual dan disintering pada suhu 800°C selama 2 jam. Berdasarkan analisis difraksi sinar-X, penambahan nano-SiC menyebabkan penurunan nilai konstanta kisi-a dari 3,0848 Å menjadi 3,0792 Å. Distorsi pada konstanta kisi-a merupakan dampak dari karbon yang mensubstitusi boron. Hasil uji resistivitas menunjukkan bahwa penambahan nano-SiC menurunkan nilai Tc-zero dari material MgB2.
Comparison of Ni0.6Co0.4Fe2O4 and NiFe2O4 Nanoparticles for Magnetic Characteristics, Synthesized Using Co-Precipitation Method Utari Utari; Yeni Herlina K. Dasi; Budi Purnama
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59191

Abstract

Comparison of nickel Ni0.6Co0.4Fe2O4   and NiFe2O4 were studied. The co-precipitation method was performed for the whole sample. After annealing of 600°C for 4 hours, the nanoparticles samples evaluated their structural properties by using Fourier Transform Infra-Red (FTIR) and X-Ray Diffraction (XRD). The XRD pattern confirms that the whole samples have the crystalline structure of the face-centered cubic (fcc) inverse spinel. Furthermore, the lattice and crystallite size of NiFe2O4 increased when added Co2+. The FTIR spectrum showed two prominent absorption bands, i.e., at around k of 358 cm-1 and 588 cm-1, where metals at tetrahedral and octahedral sites reflect intrinsic vibrations, respectively.  Finally, the decrease of saturated magnetization MS from 22.2 emu/g and 9.92 emu/g replacement of Co2+ cation with Ni2+.
Analisis Kualitas Data EEG pada Penderita Mild Alzheimer’s Disease Menggunakan Metode ICA (Independent Component Analysis) Hilman Asyrafi; Nita Handayani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.48042

Abstract

Alzheimer merupakan salah satu jenis penyakit demensia yang ditandai dengan penurunan fungsi otak secara perlahan mulai dari ingatan sampai pada fungsi fisik. Diagnosis penyakit Alzheimer dapat dilakukan melalui analisis sinyal otak hasil rekaman EEG (Electroencephalogram). Namum, masalah utama yang dihadapi dalam memahami sinyal EEG adalah sinyal yang terukur merupakan sinyal campuran antara sinyal otak dan artifact. Artifact sangat tidak diinginkan dalam perekaman EEG sebab dapat meniru dan mengaburkan gelombang asli sinyal otak. Oleh karena itu tujuan dari penelitian ini adalah menerapkan metode ICA pada pre-processing data untuk menghilangkan artifact hasil rekaman EEG, dan menganalisis data EEG hasil pre-processing secara kualitatif dan kuantitatif. Selanjutnya dilakukan analisis spektrum menggunakan metode Periodogram Welch untuk mengetahui perbedaan spektral daya antara subjek normal dan Mild Alzheimer’s Disease (MAD). Berdasarkan hasil analisis kualitatif dan kuantitatif, diperoleh bahwa sinyal EEG memiliki kualitas yang lebih baik jika pada pre-processing data diterapkan metode ICA. Adapun hasil analisis spektrum setelah diterapkan metode ICA menunjukkan adanya pergeseran spektral daya yang lebih jelas. Pada subjek normal peningkatan spektral daya dominan pada frekuensi gelombang alpha (8-13 Hz), sementara pada subjek MAD peningkatan spektral daya terjadi pada frekuensi gelombang delta (0-4 Hz). Hal ini mengindikasikan bahwa terdapat perbedaan spektral daya antara subjek normal dengan penderita MAD berdasarkan sinyal yang terukur pada lobus frontal.
Sintesis dan Karakterisasi Nanofiber Komposit PVA/SiO2 dari Silika Sekam Padi Menggunakan Metode Electrospinning Iqbal Firdaus; Simon Sembiring; Junaidi Junaidi; Andrean Johandra; TB Ikhwan Rifansyah; Rizky Ponco Rahmadi; Oki Ade Putra
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.55730

Abstract

Telah berhasil dibuat membrane separator yang berpotensi diaplikasikan untuk baterai lihitum-ion, membrane separator digunakan untuk proses transfer ion dan mencegah terjadinya arus pendek. Dalam penelitian ini membrane separator PVA/SiO2 disintesis memggunakan metode electrospinning dengan variasi berat SiO2 (0, 0.6, 1.2, 2) wt%. SiO2 yang digunakan adalah hasil ekstraksi silika sekam padi. Pengaruh penambahan SiO2 pada PVA untuk meningkatkan karakteristik membrane diantaranya porositas, dan stabilitas pada suhu tinggi. Hasil membrane yang berhasil dibuat PVA, dan PVA/SiO2 membentuk serat nano dengan ukuran diameter serat semakin kecil ketika ditambahkan  SiO2 yaitu ~ 220 nm, ukuran diameter semakin kecil  meningkatkan porositas membrane dan meningkatkan kinerja membrane dengan stabilitas suhu 165 oC
3D Inversion of Gravity Data Modeling Using The Chi Fact Algorithm for Revealing Subsurface Structure in Semarang City Rina Dwi Indriana; Mochamad Aryono Adhi; Danastri L. P. Tampubolon; Sorja Koesuma
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59295

Abstract

The interpretation of subsurface in the Semarang City with 3D inversion model using the Chi Fact algorithm has been carried out to reveal the subsurface especially related to the presence of groundwater basins. The gravity data model in this research uses 80 stations with a research area of 20 km2 which is specialized in the surrounding area of Kaligarang district. The results of the 3D inversion using the Chi Fact algorithm founded the distribution of subsurface rock density values in the Semarang City area ranging from 1.6 gr/cc to 2.98 gr/cc. The distribution of subsurface density values indicates the subsurface geological structure of the Semarang City area had a normal fault leading to the southeast.
The Simulation of Covid-19 Droplet Transmission with Hamiltonian Monte Carlo Method Mutia Delina; Irsyad Tio Majid; Ahmad Fauzan
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.53124

Abstract

Corona Virus 2019 (COVID-19) pandemic has impacted every sector in the world. This virus spread through the droplet and infected healthy people. The typical of virus transmission is through droplets from coughing and sneezing. This study developed a simulation to model a virus spread just after the infected was coughed or sneezed. In the simulation, humidity, wind velocity, and temperature were considered.  The simulation was conducted with Hamiltonian Monte Carlo, where was set a random initial velocity and angle for every 200 droplets with 500 iterations of each. The transmission data was derived from three groups: the age of 15 to 30 years old, 31 to 50 years old, 51 to 68 years old. At the age of 12 to 30 years, the droplet range and height were 3.13 meters and -0.77 meters. At the age of 31 to 50 years old, the droplet range and height were 3.22 meters and -0.83 meters. At the age of 51 to 68, the droplets range and height were 2.82 meters and -0.58 meters. The highest droplet range was from the age of 31 to 50 years old. Therefore, the age of 31 to 50 years old or the productive age was considerable with the highest risk in the droplet transmission and virus spread. This study can be adopted to consider the effective prevention in controlling the virus outbreaks.
Performance Characterization of 450 nm Visible Light Based Photoacoustic Imaging for Phantom Imaging of Synthetic Dye Contrast Agents Mahendra Kusuma Nugraha; Moh. Ali Joko Wasono; Mitrayana Mitrayana
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.49179

Abstract

Performance characterization of 450 nm visible light photoacoustic imaging has been carried out through phantom imaging of methylene blue (MB), methyl orange (MO), and methyl red (MR) dye solutions. The phantom was made of a nylon tube with a diameter of 5.0 mm (outside) and 4.6 mm (inside) having a height of 2.0 mm along with a 6×6 cm black galvanized aluminum plate as the background medium. The nylon tube was filled with each type of solution with varying molecular concentrations of 10, 25, 50 and 100 ppm. Twelve (12) phantom objects were imaged in an area of 10×10 cm. The visible absorption peak known from UV-Visible spectroscopy for each type of solution is at 664 nm (methylene blue), 465 nm (methyl orange), and 522 nm (methyl red). It was also known that the amplitude of PA emissions would increase proportionally to the concentration of dye molecules. Overall, methyl orange solutions had the highest photoacoustic emission amplitude distribution. The analysis showed that the ratio of inner diameter (ID) and wall thickness (WT) between the MB and MO phantom images to the original object were 1:0.83 and 1:0.74 (ID) and 1:3 and 1:1.5 (WT), respectively. On the other hand, the ratio of the outer diameter (OD) of the MR phantom image to the original object is 1:1.28. 
Capacitance Value Analysis of Composites of Activated Cashew Shells Charcoal and Iron Sand Muhammad Anas; Vivi Hastuti Rufa Mongkito; Mardiana Napirah; Suritno Fayanto; Amiruddin Takda; Reza Ariefka
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 1 (2022): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i1.59494

Abstract

This study aims to determine the use of iron sand extract and cashew nut shell activated charcoal in the capacitor manufacturing process and determine the effect of grain size on the capacitor capacitance with electrodes from a composite of iron sand extraction and activated charcoal from cashew nutshells. The sample preparation of cashew nutshell activated charcoal was carried out by carbonation and activation methods at a temperature of 700 0C and continued by extracting iron sand. The results of the iron sand extract were then crushed using a mortar, followed by varying the mass fraction of iron sand starting at 40%, 60%, and 80% for each particle size (60 mesh, 100 mesh, and 200 mesh). Then composite the iron sand extract and activated charcoal mixed for 4 hours, and added 0.7 mL of LiNO3 1M solution. The analysis showed that the highest specific capacitance was found in the 200 mesh grain size, namely 0.0695 F/g.

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