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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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SISTEM KERJA PANEL SURYA PORTABLE PADA ALAT ELEKTRONIK RUMAH TANGGA Masthura Masthura; Mulkan Iskandar Nasution; Dwitha Astari
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.193-198

Abstract

The want for electric electricity is an vital a part of human life. Some household appliances use electrical energy from the National Electric Company, but problems often occur in their supply which result in power outages and can disrupt activities and cause harm to the community. The purpose of this research is to understand how to portable solar generators energy can be developed as alternative electrical energy for household electronic devices, to find out how portable solar power generators work as alternative electrical energy for household electronic devices and to find out how solar panels can supplying AC electrified loads to household electronic devices. This research uses an experimental method that innovates in the field of renewable energy by utilizing solar energy (solar panels) as an alternative electrical energy. The test results obtained by this designed tool can turn on household electronic equipment such as rice cookers, fans, LED lights, charge cellphones and laptops with a maximum power of 300 Watts with a time according to the power supplied to the battery capacity so that this hardware maybe used as an alternative electrical energy to replace the generator.
PENGARUH PENAMBAHAN KONSENTRASI NaCl TERHADAP NILAI KELUARAN LISTRIK BIOBATERAI SARI BUAH MENGKUDU Ety Jumiati; Miftahul Husnah; Riadina Siregar
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.199-204

Abstract

Biobattery is a tool that can generate electrical energy from nature that is environmentally friendly, such as noni juice with the addition of NaCl concentration (0%, 10%, 20%). The purpose of this study (i) to determine the pH of the noni juice (ii) for the electrical conductivity of the noni juice (iii) to determine the electrical voltage of the noni juice (iv) to determine the electric current of the noni juice. This study used the galvanic cell method using copper (Cu) and zinc (Zn) electrodes. Based on the results of research conducted on noni juice, the highest value was obtained for noni juice with the addition of 20% NaCl concentration with pH: 2.5, Electrical conductivity: 4915 mS/cm3, voltage: 2.32 V, electric current: 3.12 mA, electric power: 7.23 mW. It can be stated that the lower the pH value, the higher the concentration of NaCl used, the greater the voltage, current, and electrical power obtained. In this study, the ability of noni juice to turn on a white LED light for 2 hours can light up with a stable voltage drop.
ANOTASI CITRA BERBASIS PYTHON UNTUK RANCANG BANGUN PERANGKAT LUNAK DETEKSI OBJEK PADA TANDAN BUAH SEGAR KELAPA SAWIT CACAT Minarni Shiddiq; Muhammad Ikhsan Hamid; Vicky Vernando Dasta; Yohanes Dwi Saputra; Dewi Anjarwati Mahmudah; Dinda Kamia Evkha Putri; Annisya Madani; Ihsan Okta Harmailil
Indonesian Physics Communication Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.135-140

Abstract

Object detection can determine the existence of an object, scope and image. Object detection begins with the introduction of an object. This method can be used to automate the process of sorting and grading oil palm fresh fruit bunches (FFB) at palm oil mills, which are still done manually. Image annotations are needed in building the software so that the software can identify object features in an image, especially imager in video frames. This study aims to annotate images of oil palm FFB into 2 categories, namely normal palm and abnormal palm. This category is the standard regulation of the Minister of Agriculture No. 14 of 2013. Image acquisition is carried out by varying the position of each oil palm FFB with the top and bottom position of the fruit which is then augmented 4 times which function to multiply the image data model to be annotated. Annotation is done using the python program application, namely Labelimg. The amount of image data that has been annotated is 200 images consisting of 100 normal palm images and 100 abnormal palm images.
PENGARUH DOPING CHROMIUM TERHADAP SIFAT KRISTALINITAS DARI NANOPARTIKEL α-Fe2O3 (HEMATITE) Novia Magdalena Purba; Erwin Amiruddin; Salomo Sinuraya; Krisman Sabar
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.141-146

Abstract

This study aims to determine the crystal structure and particle composition as well as the effect of iron oxide nanoparticles (α-Fe2O3) doped chromium for methylene blue degradation. Iron oxide nanoparticles were obtained by 3 stages of ball milling with the total time milling of 120 hours. Each stage of ball milling, the product was process by strong NdFeB magnet uin order to separate between iron oxide and non iron oxide phases. The last product of ball milling process is called BM 3. The BM 3 product was divided into 4 parts with the same amount of weight namely BM 3A, BM 3B, BM 3C, and BM 3D with variations in the concentration of 0 wt.% chromium; 5 wt.%; 10 wt.%; and 20 wt.% These samples were characterized using X-ray diffraction (XRD) method and X-ray fluorescence (XRF). The XRD measurements show that the BM 3 product has a Hematite (α-Fe2O3) phase with a Rhombohedral structure. The crystal size of the samples decreases with increasing chromium concentration. The amount of Fe decreases from 57.316% to 54.204% as  chromium increases from 0 wt.% to 5 wt.% respectively. Meanwhile, the percentage of Cr increases before being doped with 0.08% chromium and then increases after being doped with 5 wt.% chromium to 7.758%.
IDENTIFIKASI LAPISAN BAWAH TANAH DENGAN METODE GEOLISTRIK KONFIGURASI WENNER DI AREA WISATA AIR PANAS SUNGAI PINANG KABUPATEN KUANTAN SINGINGI Rizza Naflah Herlinda; Usman Malik
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.153-158

Abstract

One of the geothermal prospecting areas in Riau is located in Sungai Pinang Village, Kuantan Singingi. Geothermal prospects in this village are characterized by the presence of geothermal manifestations on the surface in the form of hot springs. The purpose of this research is to analyze the rock lithology, the depth of the permeable layer, and the profile of hot springs. The method used is the geoelectric method with the Wenner Configuration. The results obtained in line 1 have a rock lithology of clay, sandstone, limestone, and andesite rocks with a permeable rock layer located at a depth of 1.25–15.9 meters.The results obtained in line 2 have rock lithologies of clay, gravel, and andesite with permeable rock layers located at a depth of 1.25 – 9.26 meters. The hot springs come from underground pressure that forces hot water to the surface through fractures to form geothermal manifestations on the surface.The hot springs found on both lines have resistivity values of 1.19–10 Ωm on line 1 and 0.524 – 9.69 Ωm on line 2.
Classification of maturity levels of oil palm fresh fruit bunches using LED-based multispectral imaging methods and principal component analysis Mohammad Fisal Rabin; Minarni Shiddiq; Rahmondia Nanda Setiadi; Ihsan Okta Harmailil; Ramdani Ramdani; Dedi Permana
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.91-98

Abstract

Multispectral imaging (MSI) is one of the optical methods used for the classification of fruits and vegetables based on ripeness levels. MSI is simpler than hyperspectral imaging due to fewer wavelength bands used hence less processing time. In this study, MSI is used to classify the ripeness of oil palm fresh fruit bunch (FFB). The MSI system consists of three main components, namely a VIS-NIR camera, a camera lens, an LED array, and a current control unit. The use of the LED array as a light source in the MSI system aims to minimize the use of bandwidth filters. The LEDs used are arranged in a circular pattern with 8 wavelengths, namely 680, 700, 750, 780, 810, 850, 880, and 900 nm. FFB samples were recorded using the MSI system and then processed using Python language to obtain relative reflectance intensity values. The purposes of this research are to analyze the relationship between relative reflectance intensity and wavelength and to classify the ripeness level of oil palm FFB using principal component analysis (PCA). We used two categories of ripeness, unripe and ripe FFBs.The results of the PCA analysis showed that the classification carried out was able to group into two levels of ripenesses with a total variant percentage value for PC1 and PC2 of 90.95%.
PENGARUH DOPING CHROMIUM TERHADAP SIFAT MAGNETIK NANOPARTIKEL OKSIDA BESI Indah Tamara Sitorus; Erwin Amiruddin; Juandi Muhammad; Erman Taer
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.231-236

Abstract

The purpose of this study is to determine the magnetic properties expressed in the hysteresis loop as well as the morphology of iron oxide nanoparticles from iron sand of Logas Village, natural sand, which were doped with chromium. The separation between magnetic and non-magnetic particles was carried out using the strong magnet neodymium iron boron (NdFeB). Magnetic nanoparticle preparation was carried out by ball milling method for 100 hours which is called BM3. The BM3 product was divided into three parts with the same amount of weight namely  BM3A, BM3B, and BM3C. These products was doped with chromium with concentrations of 0, 10, and 20 (wt%) using ball milling for 20 hours. Magnetic properties were tested using a vibrating sample magnetometer and nanoparticle morphology with a scanning electron microscope (SEM). The magnetic properties of the samples were studied based on loop hysteresis showed that saturation magnetization, remanent magnetization, coercivity, loop squareness, and loop area decreased along with the addition of chromium doping concentration in the sample. The results of the SEM test showed that as the doping concentration was added to the sample the particle size became smaller, namely 1.316, 1.308, and 0.856 μm.
ANALISIS PENGARUH PENAMBAHAN DAUN JAGUNG PADA KERAMIK BERPORI BERBAHAN DASAR TANAH LEMPUNG Ayu Amalya Rahma; Ety Jumiati; Ridwan Yusuf Lubis
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.267-274

Abstract

Corn leaves are agricultural waste that contains silica compounds and functions to reduce cracks in the drying of porous ceramics. Variations in the composition of clay and corn leaf ash are: 100% : 0%; 90% : 10%; 80% : 20%; and 70% : 30%. The manufacture of porous ceramics uses a dry pressing technique with a presure of 4 tons for 10 minutes, using a 3 × 3 × 3 cm3 mold, fired using a furnace at 900°C for 2 hours and allowed to cool for 24 hours. The characterization used namely density, porosity, water absorption, hardness and compressive strength. The result of the charaterization of porous ceramics is: density 1,20 – 1,79 g/cm3; porosity 29,75% – 61.03%; water absorption 16,6% – 50,8%; hardness 41,41 – 187,58 MPa; and compressive strength 3,51 – 84,49 MPa. The more addition of corn leaf ash caused an increase in porosity and to water absorption and decrease in density, hardness and compressive strength.
PREPARASI NANOPARTIKEL OKSIDA BESI BERBASIS PASIR ALAM LOGAS DIDOPING KOBALT SEBAGAI MATERIAL LINGKUNGAN Erwin Amiruddin; Amir Awaluddin; Muhammad Rizki
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.293-300

Abstract

The  cobalt  doped  iron oxide  nanoparticles  have  been  prepared  by  ball  milling  method  using  Logas natural sand as a raw material. The milled iron oxide nanoparticles were doped using cobalt with concentration of 0, 5, 10, 15,  and  20  wt.%.  The  structural, magnetic and  optical properties  were  studied  using  X-ray diffractometer (XRD), vibration sample magnetometer (VSM), and UV-Vis  spectroscopy, respectively. The samples  show  cobalt-hematite  nanoparticles  as  indicated  through  XRD  measurement.  The  XRD measurements  confirmed  the  formation  of  crystalline,  rhombohedral  crystal  structure  and  hematite  nanoparticles.    The  average  crystallite  size calculated using Scherrer formula found to be 38.51, 35.67, 33.75, 32.73, and 31.53 nm after being doped with cobalt 0, 5, 10,  15,  and  20  wt. %,  respectively. The samples  exhibited  weak  ferromagnetic  behaviour  with  the  coercivity  ranged from  124  Oe  to 299  Oe.  The optical properties strongly depend on cobalt  content  and  showed  that  the  band  gaps  of  cobalt  doped  hematite  decrease  with  increasing  cobalt  content.  This work suggests that the prepared iron oxide nanoparticles are attractive photo Fenton catalysts for the degradation of methylene blue in the water.
IDENTIFIKASI PERCEPATAN TANAH MAKSIMUM DI WILAYAH BENGKULU DENGAN METODE KAWASHUMI Reni Nurjannah; Mulkan Iskandar; Lailatul Husna Lubis
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.237-242

Abstract

Maximum soil acceleration is the greatest value of increasing soil acceleration caused by a specified period of time. Maximum ground acceleration is very important to do, to reduce the risk due to an earthquake that occurs. This research is expected to be able to determine the value of the largest increase in ground velocity and areas that have the greatest level of possible danger due to ground acceleration using the Kawashumi method. From the after effects of the investigation that has been finished, it is obtained that the maximum ground acceleration value is 661.7182528 gal and it can be seen that Muko-Muko Regency in the Bengkulu region has a risk due to high ground acceleration.

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