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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 267 Documents
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Pengaruh Deklinasi Matahari terhadap parameter cuaca wilayah malang dan sekitarnya Achmad Sasmito; Alfan Sukmana Praja; Linda Fitrotul Muzayanah; Rahayu Sapta sri Sudewi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 2 (2021): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i2.44607

Abstract

Cold temperatures occur in the Dieng and Lumajang highlands from the end of July to August 2020. At almost the same time, hot temperatures also occur in the United States, Japan, and Spain. This study discusses the effect of declination of the sun on weather parameters in Malang and its surroundings. Besides, it also discusses a physical and dynamic review of the occurrence of hot air temperatures in the northern hemisphere (BBU) with cold temperatures in the southern hemisphere (BBS). The data used are numerical data of solar radiation of the atmosphere and observation data from AWS which includes elements of global radiation, temperature, and surface air humidity. Data samples were taken from Malang Climatology Station and Karang Kates Geophysical Station which represent BBS and weather information from BBU. Estimation of cold temperatures in Ranu Pani, Lumajang was carried out using the lapse rate model. Cold temperatures that occur in the East Java region are influenced by the declination of the Sun, solar radiation, the transmissivity coefficient, and the temperature advection process from Australia. When the sun is in the north, there are cold temperatures in the southern part of the earth and vice versa. The occurrence of hot or cold temperatures in each region is also influenced by the composition of gases in the atmosphere, geography, topography, and the influence of advection due to the influence of the surrounding air.
Structure and Magnetic Properties Of Fe/Si Nanoparticles Prepared by High Energy Milling Process Muhammad Rifai; Yunasfi Yunasfi; Engkir Sukirman; Yosef Sarwanto; Mujamilah Mujamilah
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 2 (2021): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i2.51029

Abstract

The structure and magnetic properties of Fe/Si nanoparticle prepared by high energy milling process have been examined, focusing on the phase transition. Fe/Si nanoparticles were processed by high energy milling (HEM) for 10 hours to 50 hours with a weight per cent ratio of 9:1. Based on the X-ray diffraction (XRD) pattern, transmission electron microscope (TEM) observations, and vibrating sample magnetometer (VSM) analysis, the phase transition induced by HEM, were evidenced. The effect of structural state and the particle size on the magnetic properties such as magnetization was also studied. It was found that iron and iron oxides (-Fe2O3/ Fe3O4) phase were exhibited on all milled samples. The magnetization value of Fe/Si nanoparticles increased up to 20 hours with 142 emu/gr saturated magnetization and then decreased linearly with increasing milling time. Referring to the XRD result, this decline was initially caused by the iron oxide formation and magnetic interaction between iron and iron oxides nanoparticles. The phase and magnetic properties value changes related to the interaction mechanism between Fe atoms caused by interstitial occupied of Si atoms, particle size reduction, and oxidation process.
Measurement of Physicochemical Properties, Electrical and Thermal Conductivity of Wood Ash for Effective Soil Amendment M O Kanu; Gabriel Wirdzelii Joseph; Israel George
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 2 (2021): IJAP Volume 11 ISSUE 02 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i2.47345

Abstract

The ability of the soil to regulate heat energy is important for plant growth, soil texture and strength. Many agricultural soils are acidic in nature which tends to limit plant growth and microbial activity. Aside from agricultural lime, wood ash is used to amend physical and physicochemical properties of the soil. To maintain the soil hydraulic and physicochemical properties and to increase plant yield, it is important to know the physicochemical and physical properties of the ash used. The physiochemical and physical properties vary across various plant species. Ash samples from seven different plants were used for this study. The Horiba metre was used to measure the electrical conductivity, pH, Total Dissolved Solid (TDS) and salinity of the samples, while the Lees Disc apparatus was used to measure the thermal conductivity of the samples. The study revealed that moringa olieferra ash has the highest salinity, TDS and Electrical conductivity, while azadichta indica and tiobroma cacoa have least pH. Also, Kyah seleelygalisis and azadichta indica had the highest and lowest thermal conductivity respectively.
Penentuan Peak Kilovoltage (kVp) Pesawat Sinar-X Dengan Pemanfaatan Imaging Plate (IP) Di RSUD Dr. Moewardi Bibit Cahyani; Utari Utari; Muhtarom Muhtarom
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 2 (2021): IJAP Volume 11 ISSUE 02 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i2.45431

Abstract

Research has been carried out to determine the kVp of X-ray aircraft using an imaging plate (IP) as a measuring tool. The imaging plate functions to record images after irradiation and as a detector to capture and store X-ray energy when it penetrates an object. The purpose of this study is to use IP as a kVp measurement tool. The method used is to create a characteristic curve of the relationship between the ratio of Region of Interest (ROI) of two aluminum filters to rated voltage (kVp). From the research obtained the equation y = 2816.61 x2 – 4532.19 x + 1878.65 with R2 = 0.988. The kVp test was carried out using a fluoroscopic X-ray model SM-20HFH. The test results obtained that the measured kVp value at a voltage of 70 kV was 66.21 kV and an error value of 5.41%. While the measured kVp value at 55 kV is 58.95 kV with an error value of -7.18%. These results indicate that IP can be used to measure kVp with an error below the allowable tolerance, namely the max error ≤ of 10%.
Pengukuran Indeks Ultraviolet Matahari dan Atenuasinya oleh Beberapa Bahan untuk Rekomendasi Waktu Aman Berjemur Sigit Ristanto; Choirul Huda; Affandi Faisal Kurniawan
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 2 (2021): IJAP Volume 11 ISSUE 02 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i2.52753

Abstract

Telah dilakukan penelitian tentang pengukuran indeks ultraviolet (UV) matahari dan atenuasinya oleh beberapa bahan. Penelitian ini dilatarbelakangi oleh kebutuhan berjemur di tengah terik  matahari sebagai upaya meningkatkan imun tubuh ditengah Pandemi Covid-19. Indeks ultraviolet menjadi kunci dalam menentukan waktu yang tepat. Penelitian ini bertujuan memperoleh data distribusi indeks UV di suatu wilayah beserta atenuasinya untuk keperluan rekomendasi rentang waktu aman berjemur. Alat ukur yang digunakan berupa sensor indeks UV analog yang mengubah radiasi UV menjadi tegangan analog pada rentang 0 – 1 V. Nilai output dibaca menggunakan multimeter lalu dikonversi ke dalam UV indeks menggunakan tabel konversi bawaan produk. Pengukuran UV indeks dibagi menjadi tiga kondisi, pertama berdasarkan rentang waktu pada rentang waktu dari pukul 08.00 – 16.00 WIB, pengaruh tutupan awan, dan pengukuran UV indeks saat melawati beberapa bahan: kacamata transparan, kacamata riben, plastic kemasan, topi, dan kaos olahraga. Hasil penelitian menunjukkan distribusi indek UV berdasarkan rentang waktu berhasil diperoleh, tutupan awan menyebabkan penurunan indek UV sebesar 4 tingkat dan atenuasi Indek UV oleh beberapa bahan berhasil diperoleh. Berdasarkan sampel pengambilan data di Tinjomoyo Banyumanik Kota Semarang diperoleh waktu aman berjemur berada pada rentang sebelum Pukul 10.00 WIB dan setelah Pukul 14.00 WIB.
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): IJAP Volume 12 ISSUE 01 YEAR 2022
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): IJAP Volume 12 ISSUE 01 YEAR 2022
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.

Page 20 of 27 | Total Record : 267

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