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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 15 Documents
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Search results for , issue "Vol 20, No 3 (2023)" : 15 Documents clear
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.
PENGARUH PENAMBAHAN ADITIF DAUN JAGUNG (Zea mays L.) TERHADAP SIFAT FISIS DAN MEKANIK KERAMIK ALUMINA Ayu Dwi Retno; 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.20.3.275-278

Abstract

Research has been carried out on the manufacture of alumina ceramics. This study aims to determine the effect of the addition of corn leaf additives on the physical and mechanical properties of alumina ceramics. Variations in the composition of alumina and corn leaf ash are: 95% : 5%; 90% : 10%; and 85% : 15%. The process of making these ceramics uses the die prissing method, and uses variations in firing temperature, namely 1300°C  and 1400°C for 1 hour, and is printed using a 3 × 3 × 1 cm3 mold. the characterization of the tests carried out included physical properties, namely density and porosity and mechanical properties, namely hardness.  The  results of the data obtained from  measuring  the  density  at 1300°C are 2.11 – 2.18 g/cm3 and at 1400°C they are 2.13 – 2.20 g/cm3, the porosity at 1300°C is 25.82% – 27.25% and 1400°C temperature of 25.36% – 26.89%, and 1300°C temperature hardness test of 59.641 MPa – 67.055 MPa and 1400°C temperature of 61.926 MPa – 70.958 MPa.
PEMODELAN GENERATOR PLASMA HIDROGEN FREKUENSI GELOMBANG MIKRO TEKANAN ATMOSFIR Reeky Fardinata; Saktioto Saktioto; Rakhmawati Farma
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.20.3.205-214

Abstract

The model used in this work is a two-dimensional fluid plasma model coupled with Maxwell equations at atmospheric pressure. The model was created by applying different plasma torch parameters using the finite element approach. Three separate stages of the numerical modeling were used to show how the increase in electron density increases with time. It may be inferred from the molecular ion distribution features that the torch's quartz tube's port, which is larger than the tube's center, is where the molecular ions are primarily disseminated. Reduced pressure and the calculated distance from the port to the center of the quartz tube result in a drop in the density ratio of molecular ions to electrons. The research on microwave plasma properties revealed that atmospheric pressure is important for modeling and developing plasma sources, particularly for the conversion of carbon dioxide.
SIFAT OPTIK NANOMATERIAL ZnO DOPING NIOBIUM BERDASARKAN WAKTU SINTESIS Iwantono Iwantono; Muhammad Pauji; Puji Nurrahmawati; Nashiha Chalvis Syahra
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.20.3.243-246

Abstract

This research was conducted to fabricate dye sensitized solar cell based on ZnO nanomaterial. Efforts to see the optical properties of niobium-doped ZnO are through UV-Vis characterization. Niobium-doped ZnO nanomaterials with growth time variations of 6, 8, and 10 hours have been successfully synthesized using hydrothermal methods. Samples resulting from synthesis were characterized using UV-Vis spectroscopy along with its energy gap. Samples with a synthesis time variation of 6 hours had higher absorbance absorption and a low energy gap of 3.09 eV.
ANALISIS UJI FISIS BRIKET AROMATERAPI BERBAHAN SERAI DAN SERBUK KAYU DENGAN PEREKAT PINUS MERKUSII Ervina Putri Wulandari; Ety Jumiati; Miftahul Husnah
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.20.3.247-252

Abstract

Aromatherapy briquettes have been made as an alternative fuel made from lemon grass, sawdust and pine resin. Composition variations between lemongrass and sawdust (meranti) in samples A (30% : 70%), B (40% : 60%), C (50% : 50%) with 60% pine resin adhesive with drying time 7 days. Physical test parameters carried out: density, moisture content, and heat. The test results showed that the optimum aromatherapy briquettes were sample C which had a density value of 0.954 g/cm3, a moisture content of 7.81% and a calorific value of 8640 cal/g. The value of water content and heating value complies with SNI 01-6235-2000.
PERANCANGAN SISTEM MONITORING DAN KONTROL KUALITAS AIR BERBASIS IoT PADA KOLAM IKAN AIR TAWAR Riski Muhammad Natsir Nasution; Nazaruddin Nasution; Mulkan Iskandar Nasution
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.20.3.279-282

Abstract

Research has been carried out on designing an IoT-based water quality monitoring and control system in freshwater fish ponds, which aims to produce a tool that is able to monitor and control water quality remotely in freshwater fish ponds, to find out how the tool works in monitoring and controlling water quality over long distances in freshwater fish ponds. This research was conducted by connecting several components, namely using Arduino Mega 2560, WiFi expansion shield, pH sensor, turbidity sensor, DS18B20 sensor, ultrasonic sensor HC-SR04, and two DC pumps. Each sensor is compared with the actual measuring instrument and has an average percentage of error, the pH sensor is compared three times, namely the pH buffer solution of 4.01 with an average error of 2.1%, in the pH 6.86 buffer solution the average error is 0.4 %, and in aquadest solution the average error is 0.7%, the turbidity sensor has an average error of 1.6%, and the DS18B20 sensor has an average error of 0.4%. It can be concluded that the designed tool has been successfully made, and works well, for monitoring it is displayed on the LCD and in the Blynk application, for controlling water can be done through the Blynk application by turning on and off the pump that has been made.
PREDIKSI INDEKS NITROGEN DIOKISDA (NO2) MENGGUNAKAN MODEL NEURALPROPHET STUDI KASUS DKI JAKARTA Jhon Paul Estomihi Togatorop; Risang Bayu Firdaush; Yosafat Donni Haryanto
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.20.3.215-222

Abstract

Nitrogen dioxide gas (NO2) is one of the air quality parameters that can delay nerve recovery after a stroke. DKI Jakarta as the Capital City of the State of Indonesia continues to experience an increase in population which is marked by an increase in the number of motorized vehicles and infrastructure development. Air quality prediction, especially NO2, is important as an anticipatory step in detecting air pollution, especially if the measuring instrument is damaged. This study uses standard air pollutant index (ISPU) data as a time series from 2018 – 2021 to predict the NO2 index in 2022 using the NeuralProphet model. The NeuralProphet model which was designed with parameters of 1000 epochs, learning rate of 0.10, proportion validation of 0.10, and daily frequency produced MAE and RMSE models from the training data of 5.426610 and 7.977689. MAE validation and validation RMSE from the proportion of 0.10 tasting data were 27.762064 and 35.434227. The prediction of the NO2 index for 365 days resulting from the NeuralProphet model shows that the NO2 index experiences an increasing trend which is influenced by seasonal events both annually and weekly. Affecting annual seasons, such as national holidays and monsoon rain patterns. The national holidays in question, such as New Year’s Day, Lunar New Year’s Day, and Christmas Day, trigger an increase in traffic flow. The peak of the NO2 index occurred in February and December, while the NO2 index weakened as it entering October.

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