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Usman Malik
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INDONESIA
Komunikasi Fisika Indonesia
Published by Universitas Riau
ISSN : 14122960     EISSN : 2579521X     DOI : 10.31258/jkfi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
KFI mempublikasikan artikel hasil penelitian dan review pada bidang fisika, namun tidak terbatas, yang meliputi fisika murni, geofisika, plasma, optik dan fotonik, instrumentasi, dan elektronika, dan fisika terapan (aplikasi fisika).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 390 Documents
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INTERPRETASI KUALITAS AIR BAWAH TANAH DI KELURAHAN TANGKERANG TENGAH KECAMATAN MARPOYAN DAMAI MENGGUNAKAN METODE GEOLISTRIK DAN GEOKIMIA Devi Arvianti; Juandi Muhammad
Komunikasi Fisika Indonesia Vol 18, No 2 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.2.124-130

Abstract

Kelurahan Tangkerang Tengah adalah salah satu lokasi perumahan dengan kawasan padat penduduk serta memiliki litologi gambut. Kondisi tersebut dapat menimbulkan dampak pencemaran air bawah tanah yaitu akibat limbah domestik dari perumahan. Penelitian ini bertujuan untuk menentukan pola penyebaran dan kualitas air bawah tanah di kelurahan Tangkerang Tengah. Metode yang digunakan adalah metode geolistrik konfigurasi Wenner dan geokimia dengan mengalisa parameter pH, kekeruhan, TDS, konduktivitas dan salinitas. Hasil penelitian menunjukkan bahwa di daerah studi pada lintasan pertama terdapat 5 lapisan dengan akuifer berada dilapisan ketiga pada kedalaman 9,26 – 17 meter sedangkan pada lintasan kedua juga terdapat 5 lapisan dengan akuifer berada dilapisan keempat pada kedalaman 13,5 – 19,8 meter. Berdasarkan hasil uji parameter geokimia dapat dikatakan bahwa air bawah tanah dilokasi penelitian menunjukkan dua parameter yang tidak sesuai dengan standar baku mutu  yang ada pada Peraturan Menteri Kesehatan Republik Indonesia No. 32 Tahun 2017 yaitu nilai pH < 6,5 dan salinitas > 0,5 ppt.
PEMETAAN SEBARAN MATA AIR PANAS DI DAERAH OBJEK WISATA DESA PAWAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENIS KONFIGURASI WENNER Fadli Abdillah; Usman Malik
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.35-41

Abstract

Geothermal is one of the many natural resources that provides benefits to human such as using hot spring as a natural tourism spot. Hot spring in Pawan Village need to be researched to explore the presence of Hydrotermal. In this study, the distribution of hydrotermal that occur based on the resistivity of subsurface rocks resulting from geophysical exploration using resistivity geolelectric method with Wenner configuration. The result of this exploration were processed using Res2Dinv software to view soil layer data based on resistivity and points containe hot water aquifers. The resistivity values on the underground layer srtucture model is ≤ 10 Ohm.meter on each trajectory. The constituent layers of each track consist of hot water, clay, sand interlocking with clay, gravel sand and gravel.
PREDIKSI CURAH HUJAN DAN KELEMBABAN UDARA KOTA PEKANBARU MENGGUNAKAN METODE MONTE CARLO Melani Seprima; Defrianto Defrianto
Komunikasi Fisika Indonesia Vol 17, No 3 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.3.134-138

Abstract

Weather prediction is important in our lives and can minimize the impact that will occur in the future. Rainfaal and humidity greatly affect the weather conditions in Indonesia. Accuracy in the prediction of rainfall and humidity is very important because it can be used in various interests. The data used are the monthly average data of rainfall and humidity in the city of Pekanbaru in 2014–2018 obtained from BMKG Pekanbaru, then the monthly average data will be processed using a MATLAB R2015a based program so that an average rainfall prediction simulation is obtained and air humidity in 2019–2023. MATLAB R2015a based program using the monte carlo method and has error value 0.0887913.
OPTIMALISASI PENGGUNAAN E-MODUL DAN PHET SIMULATION SEBAGAI VIRTUAL LAB DI MASA PANDEMI COVID-19 Vepy Asyana; Arini Arini
Komunikasi Fisika Indonesia Vol 17, No 3 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.3.160-165

Abstract

This study examines the use of e-modules and PhET simulations as virtual labs in basic physics. The purpose of this research is to optimize the available virtual labs. To facilitate the implementation of practicum, this study uses e-module as a companion material used by users. The research was conducted in two stages. The first is conducting direct trials using PhET simulations and e-modules through Google classroom. The second stage is primary data collection through a questionnaire instrument given to respondents via Google form. The questionnaire instrument was then analyzed by testing the validity, reliability and usability. From the validity and reliability test results obtained 9 question items that have valid and reliable criteria of 0.936 with very high criteria. The usability results show the percentage of respondents to the questions given through the questionnaire dominated by agreeing and strongly agreeing to the four usability factors. This shows that the use of e-module and PhET simulation as virtual lab fulfills the usability element.
PEMBUATAN ALAT LABORATORIUM UNTUK PRAKTIKUM OPTIK GEOMETRI TINGKAT SMA BERBASIS LASER DIODA Alexander Nasution; Minarni Minarni; Rakhmawati Farma; Sinta Afria Ningsih
Komunikasi Fisika Indonesia Vol 18, No 2 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.2.137-145

Abstract

Peningkatan literasi sains siswa Indonesia membutuhkan metode pembelajaran yang standar, salah satunya mengunakan metode pembelajaran dengan alat demo atau alat laboratorium. Namun penyediaan alat tersebut oleh sekolah belum optimal karena pendanaan yang kurang. pelajaran Fisika tingkat SMA khususnya kelas X atau XI membahas tentang optik geometri. Kit alat optik geometri yang ekonomis diperlukan untuk menunjang hasil belajar siswa pada materi tesebut. Penelitian ini bertujuan untuk membuat kit optik geometri yang ekonomis dan sederhana berbasis laser untuk percobaan optik geometri. Kit tersebut yang terdiri dari laser dioda dengan panjang gelombang 650 nm dan daya 5 mW, tangki pembiasan akrilik, skala sudut berbentuk melingkar. Percobaan yang dilakukan adalah pengunaan Hukum Snelius pada medium udara-air, menentukan indek bias cairan, dan sudut kritis. Pada penelitian ini, modul percobaan digunakan pada siswa MAN 1 Padang Lawas, Kecamatan Barumun, Sumatera Utara. Beberapa uji yang dilakukan yaitu uji kelayakan alat, uji praktikalita kit optik geometri, dan uji efektifitas penggunaan Kit Terhadap Hasil Belajar Siswa Kelas X. Hasil rata-rata semua aspek uji kelayakan menghasilkan skor 96,25%. Hasil uji praktikalitas adalah 85,00 %. Untuk uji efektifitas penggunaan kit adanya perbedaan hasil pre-test dan post-test pada kelas eksperimen dan kelas kontrol dimana pada kelas eksperimen rata-rata nilai siswa dari 32,83 pada saat pre-test menjadi 73 setelah post-test, sementara hasil pre-test kelas kontrol dari rata-rata 31,83 menjadi 68 setelah dilakukan post-test
INTENSITAS EFEKTIF SINYAL Wi-Fi DALAM RUANGAN TERTUTUP TERHADAP FUNGSI TERMODINAMIK Zamri Zamri; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.81-87

Abstract

Wi-Fi signal is an electromagnetic wave which in its transmission does not require an intermediary medium used in communication. But the intensity of the signal is influenced by the media it passes through. So in this article we will investigate how the signal propagation in a room is affected by the thermodynamic function. The treatment carried out is to show how the source point, namely the router and the receiver, namely the receiver, where later what is investigated is the trip to the position function, then a measurement will be carried out at that position which depends on changes in temperature and humidity in a closed room which is limited to the study. The source studied in the study was the signal strength intensity on the position, humidity and temperature functions. What is analyzed is the process of wave fluctuation at a certain time with varied data which will later be compared with other experimental results as a comparison, and will also show the signal intensity contour under normal conditions and conditions when the disturbance occurs.
SEBARAN AIR TANAH MENGGUNAKAN METODE GEOLISTRIK RESISTIVITAS KONFIGURASI DIPOLE-DIPOLE Resma Silvia; Usman Malik
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.18-21

Abstract

This research has been worked in the Graha Mustamindo Permai 3 Housing area, Rimba Panjang Village, Tambang District. This research been thorough to calculate the value of measured rock resistivity in Graha Mustamindo Permai 3 Housing and analyze rock layer types through rock resistivity values at Sepakat street, Rimba Panjang, Riau. The method using in this research is geoelectric resistivity of the Dipole-dipole configuration, two lanes with the same length of 100 meters are used and spacing between electrodes is 7 meters. The data obtained were processed using Res2Dinv software version 3.54.44. The data result that obtained show two differences trajectories in Rimba Panjang Village has varying resistivity, namely in the first lane around 1.595 Ωm to 2,762 Ωm and in the second lane 1.594 Ωm to 5,879 Ωm. Groundwater potential in the first and second lanes is quite large and is thought to be in a free aquifer so that it is easy to drill.
ANALISIS KUALITAS DATA KELUARAN HARIAN ELEKTRON AKSELERATOR LINIER Heru Santoso; Muhammad Hamdi; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 17, No 3 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.3.166-171

Abstract

Linac radiotherapy measurentoften experience instability. One of the irradiation errors with Linac can occur because the radiation beam that comes out is not expected properly. Determination of the correction factor and linearity is important to analyze the charge output of the electron energy emitted by Linac's modality to see the stability of the emitted charge. This study uses Electron Linear Accelerator Electron beam daily output data with a 10 cm × 10 cm applicator, 100 cm SSD, 0.125 cc cylindrical ionization detector PTW type 31010 Semiflek and uses a slab solid phantom with energy variations of 6 MeV, 8 MeV, 10 MeV, 12 MeV and 15 MeV. The measurement results are calculated using the IAEA TRS 398 protocol. The result of linearity correction factor of 96.87% which shows the stability value of the electron beam load output is very good, and the results of the correction factor show the enumeration values of each energy 6 MeV, 8 MeV, 10 MeV, 12 MeV and 15 MeV namely 0.030342129 nC, 0.03034 nC, 0.03034 nC, 0.03034 nC and 0.03034 nC values respectively still within the tolerance range of measurement ± 1. The correction factor that has been obtained is used as a parameter in calculating the absorbance dose to the maximum depth.
IDENTIFIKASI LITOLOGI BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI DIPOLE-DIPOLE DI WISATA HAPANASAN DESA PAWAN KABUPATEN ROKAN HULU Dandy Putra; Usman Malik
Komunikasi Fisika Indonesia Vol 18, No 2 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.2.106-110

Abstract

Salah satu sistem panas bumi yang terdapat di Riau adalah Desa Pawan, Kabupaten Rokan Hulu. Sistem panas bumi itu tersimpan dalam batuan yang terletak di bawah permukaan bumi, sehingga perlu diidentifikasi litologi bawah permukaannya. Tujuan riset ini adalah menganalisa litologi lapisan batuan yang ada di objek wisata Air Panas Pawan. Metode yang digunakan yaitu geolistrik Konfigurasi Dipole-Dipole. Hasil yang diperoleh pada lintasan II memiliki resistivitas berkisar antara (30,7 – 149) Ohm-meter yang diidentifikasi sebagai akumulasi air yang diapit lapisan lempung. Lapisan ini terletak pada kedalaman (0,7 – 8,71) meter. Lapisan kedua memiliki resistivitas berkisar antara (328 – 722) Ohm-meter yang berada pada kedalaman bervariasi, yaitu (0,6 – 10,8) meter yang diidentifikasi adanya pasir. Lapisan ketiga memiliki resistivitas berkisar antara (1.500 – 7.713) Ohm-meter yang berada pada kedalaman (0,7 – 15,7) meter yang diidentifikasi adanya batu pasir. Kesimpulan yang dapat diambil adalah bahwa metode geolistrik Dipole-Dipole telah berhasil diterapkan untuk mengidentifikasi litologi bawah permukaan di daerah prospek panas bumi.
PENENTUAN NILAI SUSEPTIBILITAS DAN UKURAN PARTIKEL MAGNETIK PASIR ALAM LOGAS KABUPATEN KUANTAN SINGINGI MENGGUNAKAN VARIASI UKURAN BALL MILLING Azura Royka; Erwin Amiruddin
Komunikasi Fisika Indonesia Vol 18, No 1 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.1.42-47

Abstract

Magnetic properties and morphology of natural sand has been carried out in Logas Village, Kuantan Singingi Regency have been determined. Iron sand samples were processed using iron sand separator (ISS) prior to ball milling for separating between magnetic and non magnetic particles. The product of ISS was milled for 90 hours using ball milling first step method with milling ball size of 1.5 cm. Themagnetic and non-magnetic particles of ball milling products were separated  using Neodymium Iron Boron (NdFeB) magnet. The product of ball milling first step then was milled for another 30 hours with milling ball size of 0.5 cm and 0.7 cm. The susceptibility and mass susceptibility were determined based on magnetic induction of a selenoid measured using Probe Magnetic Pasco PS-2162. The composition of Logas natural sand was measured using x-ray fluorescence spectroscopy (XRF). The morphology of the magnetic particles are determined using scanning electron microscope (SEM). The results showed that the particle size of natural sand for 90 hours + 30 hours milling displays the particle sizes from 100 µm to 800 µm. As for the particle size of the samples synthesized with 90 hours + 30 hours for 0.7 cm milling ball size, the particles are almost evenly distributed, which is about 5 µm to 100 µm. The content of Fe and Ti in the sample has increased while for Si has decreased. Mass susceptibility increases with increasing ball milling time and ball milling size.

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