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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 10 Documents
 1 
Search results for , issue "Vol 17, No 3 (2020)" : 10 Documents clear
FABRIKASI DAN KARAKTERISASI ELEKTRODA KARBON DARI BIOMASSA SERABUT BUAH NIPAH DENGAN VARIASI KONSENTRASI AKTIVATOR KOH Ade Nur Indah Lestari; Rakhmawati Farma; Vepy Asyana; Awitdrus Awitdrus
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.17.3.127-133

Abstract

Today the need for electrical energy has increased due to the large number of electronic devices that require high electrical energy. To overcome this, a large storage of electrical energy is needed. One of the constituents of energy storage devices that is very important is the electrode. This study used nipah fibers as the basic material for electrodes, because the potential of nipah fruit has not been widely used. The purpose of this study was to determine the effect of KOH activator on the quality of activated carbon from nipah fruit fibers using variations of KOH activator concentrations 0.2 M, 0.3 M, and 0.4 M with sample codes SBN-02, SBN-03, and SBN-04. The manufacture of activated carbon electrodes is carried out through a process of pre-carbonization, chemical activation, carbonization, and physical activation. Characterization of TGA resulted in a resistant temperature of 296°C with a maximum speed of 0.166mg/min. XRD analysis produced a semicrystalline diffraction pattern consisting of two peaks around 24° and 44° at an angle of 2θ indicating the orientation of the hkl (002) and (001) planes.
SINTESIS DAN KARAKTERISASI NPP PERAK (Ag-NPs) MENGGUNAKAN EKSTRAK KULIT BUAH NAGA SEBAGAI BIOREDUKTOR Rosman Parningotan; Yanuar Hamzah
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.17.3.139-143

Abstract

Silver nanoparticle were successfully synthesized by using the red dragon fruit peel extract as a bioreductor. The synthesis process is mixed the solution of silver nitrate (AgNO3) 1mM and red dragon fruit peel extract with a volume ratio 1 : 5 and and then mixed with a few drops of NaOH solution 1M until the solution has a pH of 10 each and then stirred using magnetic stirrer for 14 minutes for each sample then incubator. The sample are characterized using the Ultra Violet Visible (UV-Vis) spectroscopy resulting in the wavelength peaks and energy band gap at 416 nm and 2.98 eV. A functional group that plays a role in reducting AgNO3 using the Fourier Transform Infra-Red Spectroscopy (FTIR) show six major groups that have interval of 602–3427 cm-1. The result of the X-Ray Diffraction (XRD) spectrum analysis saw a 10.07–102.73 nm crystal size with the Face Center Cubic (FCC) crystalline structure and have an Ag2O impurity. From Scanning Electron Microscope (SEM) image shows that morphology of sample is still agglomerated. The findings of the present research lead to conclusion that the red dragon fruit peel was found to reduced the silver ions to silver nanoparticle.
PENGUNAAN PENCITRAAN MULTISPEKTRAL PADA PANJANG GELOMBANG 520 NM DAN 800 NM UNTUK MENGEVALUASI TINGKAT KEMATANGAN TBS KELAPA SAWIT Sinta Afria Ningsih; Minarni Shiddiq; Dodi Sofyan Arief; Ikhsan Rahman Husein
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.17.3.144-149

Abstract

Oil palm fresh fruit brunch (FFB) are the main source of crude palm oil (CPO). Sorting and grading FFB are important in order to obtain high quality CPO. Multispecral imaging has been purposed to be implemented in high speed sorting machines due to less wavelength bandwidths used hence less processing time. This study was aimed to evaluate the ripeness levels of oil palm FFB based on relative reflectance intensity and fruit firmness. Multispectral images were acquired using two bandpass filters mounted in a filter wheel with wavelengths of 520 nm and 800 nm respectively. The image acquisition and processing were controlled using python based program. The samples consisted of 30 oil palm FFBs of Tenera varieties with three ripeness levels as unripe, ripe, and overripe. The result showed that the relatif reflectance intensity at wavelength of 520 nm is inversely proportional to the maturity level, on the other hand,  relatif reflectance intensity at wavelength of 800 nm is directly proportional to the maturity level. The relation between the firmness and ripeness level are inversely proportional. Relative reflectance intensity of the multispectral images at the wavelength of 800 nm had a better correlation to the palm fruit firmness than the image at the wavelength of 520 nm with the correlation coefficient (r) of -0.0198 at 520 nm and -0.8594 at 800 nm. it can be shown that the multispectral imaging is potensial to be implemented for FFB ripeness evaluation.
PENGARUH PENAMBAHAN LOGAM TRANSISI NIKEL TERHADAP SIFAT FISIS NANOROD ZnO Sumarti Sumarti; Iwantono Iwantono; Awitdrus Awitdrus
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.17.3.155-159

Abstract

Nickel-doped ZnO nanostructures have been successfully grown using seed mediated hydrothermal method. The growth of ZnO nanostructures has been done by concentration of the Ni-doped solution, is 8 mM with the growth temperature of  90°C in 7 hours. The grown ZnO nanostructures were characterized by using UV-Vis Spectroscopy, FESEM, and XRD. The UV-Vis spectra of the samples showed that the ZnO nanorod is hexagonal in shape with a strong absorption occured in the wavelength range of 300-380 nm. The FESEM images showed that geometrical shape of Ni-doped ZnO nanostructures are nanorod with a hexagonal and nanoflower faced shapes. XRD patterns observed show five diffraction peaks at 2θ: 32,09°; 34,76°; 36,65°; 47,95° and 56,97° for Ni doped ZnO nanostructures with crystal orientation of (100), (002), (101), (102) and (110) respectively. The strongest line was found in the crystal plane of (101).
PENGARUH VARIASI SUDUT DATANG DAN SUDUT TANGKAP CAHAYA PADA NILAI KONTRAS CITRA SPEKEL BERAS BERBASIS GUI MATLAB Mahardika Mega Utama; Wiwis Sasmitaninghidayah
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.17.3.120-126

Abstract

Rice is the staple food of Indonesian. Rice quality is a factor that needs attention because it is related to consumer health.Checking the quality of rice using digital images can be applied because it is non-invasive, so the rice will be more hygienic. The method of utilizing digital images that can be used for checking the quality of rice is LSCI (Laser Speckel Imaging). This method uses a speckle image, that contrast value is analyzedusingImageJ or MATLAB software. To obtain the optimum speckle image contrast value, the arrival angle (laser angle) and capture angle (camera angle) must be adjusted properly. Obtained angle values that produce the optimum speckle image contrast, are at the arrival angle 40o and capture angle 30o at 60o data capture position. The average of the optimum contrast value is 1.2617 a.u. To simplify the speckle image processing, a speckle image contrast analysis application based on the GUI MATLAB was created. Obtained the measurement accuracy from the application is ranged from 99,99 % to 100.00%.
IDENTIFIKASI AIR TANAH DI PERUMAHAN GRAHA MUSTAMINDO PERMAI 3 MENGGUNAKAN METODE GEOLISTRIK RESISTIVITAS KONFIGURASI SCHLUMBERGER Teta Emi Sapitri; Usman Malik
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.17.3.150-154

Abstract

Identification of groundwater at Graha Mustamindo Permai 3 Housing Complex, Rimba Panjang Village, District Tambang, Kampar Regency, Riau Province has been done. The method used in this study is the geoelectric method with Schlumberger configuration. Identification of the aquifer layer was carried out on 2 tracking lines with a length of 100 meters. Measurement data were processed using software Progress. The results of data processing of track 1 and 2 show a maximum depth of 35 meters. The results of aquifer interpretation on track 1 are at depth of (3.90–11,13) meters with a resistivity value of 246.51 Ω.m. Track 2 is at a depth of (7.43–14.66) meters with a resistivity value of 142.15 Ω.m. Soil water samples were tested for pH parameters. All water samples have acid levels with an average pH of 5. So that it can cause rust an inner surface of water pipe resulting smelly water therefore the water cannot be consumed by the people.
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.
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.
ANALISA SUSEPTIBILITAS MAGNETIK DAN KANDUNGAN LOGAM BERAT AKIBAT POLUTAN KENDARAAN BERMOTOR DI BEBERAPA RUAS JALAN KOTA PEKANBARU Vischa Vahyra; Salomo Salomo
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.17.3.114-119

Abstract

The research on the magnetic susceptibility, mass susceptibility, and heavy metal content due to automotive contaminants using magnetic susceptibility and X-ray fluorescence  has been performed. Samples were taken on three roads in Pekanbaru City, i.e. Jendral Sudirman, Ahmad Yani and Pangeran Hidayat Road. The sample was dried, sifted, separated between magnetic and non-magnetic particles, identified and analyzed. The magnetic induction value of the concentrate as a function of current (200,400,600,800,1000) mA was determined using the Pasco PS-2162 magnetic probe and 2500 winding solenoid. The magnetic induction value also increased when the electrical current was increased.  The findings of this analysis showed that concentrates had the magnetic susceptibility values (4888.8–11095.8) × 10-5, while the mass susceptibility of concentrates had values (2284.48–7513.05) × 10-8 m3/kg.  The XRF test is done on three concentrates, which are JS 08, AY 01, and PH 13. The XRF test results showed that all the concentrates contained Mn, Ni, Cu, Zn and Pb heavy metals. Based on the threshold value of heavy metals as soil contaminants, it was established that the content of Cu, Zn, and Pb at JS 08, AY 01, and PH13 concentrations exceeded the threshold. Ni material had reached the threshold only to focus on JS 08.

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