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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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STUDI SIFAT OPTIK BERDASARKAN PREKURSOR DALAM SINTESIS ZnO Viza Novia Putri; Iwantono Iwantono; Puji Nurrahmawati; Nashiha Chalvi Syahra
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.25-30

Abstract

ZnO is a semiconductor material that can be applied for solar cells, biosensors, and electronics. In this study, the synthesis of ZnO was carried out using two precursors, namely zinc acetate dihydrate (ZAD) and zinc nitrate hexahydrate (ZNH). Synthesis of ZnO determine the optical properties based on the precursors. The synthesis of ZnO by hydrothermal method. The results of ZnO were analyzed using UV-Vis spectroscopy characterization. UV-Vis spectroscopy characterization determine for the absorbance and transmittance of the samples. The wavelength range was 200 – 800 nm. The absorbance spectrum shows strong absorption occurs at UV wavelengths. That are effectively applied to solar cells. The highest absorbance was obtained by the ZAD precursor. The transmittance for the ZAD precursor exceeded 8.8% and ZNH precursor it exceeded 19.7% at visible light wavelengths. The band gap energy of ZnO with ZAD precursor and ZNH precursor are 2.85 eV and 2.87 eV. Furthermore, other optical properties have been calculated from absorbance measurements such as the urbach energy.
PENGARUH GELOMBANG MIKRO DAN SULFUR SEBAGAI AGEN PASIVASI TERHADAP SPEKTRUM ABSORBANSI KARBON DOTS BERBASIS BAN BEKAS Ananda Tira Septiana Sari; Ety Jumiati; Miftahul Husnah
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.20.2.147-152

Abstract

Used tires that are not used are usually thrown away and cause damage and environmental pollution. Information on the use of used tires is still limited, used tires are usually used in the synthesis of nanomaterials such as in the field of nanotechnology. This research was conducted to determine whether carbon dots can be synthesized from used car tires, sulfur can be used as a passivation agent in the synthesis of carbon dots, and to determine the wave absorption and fluorescence of carbon dots synthesized purely and with the addition of a passivation agent.Sulfur was used as a passivation agent with a carbon and sulfur ratio of 1:1. Microwave time variations were used 30, 35, and 40 minutes. The UV-Vis characterization of carbon dots showed a higher absorbance with variations in the length of microwave time and the addition of passivation agents. Luminance analysis with UV lamp obtained a brighter glow on karbon dots with the addition of a passivation agent.
IDENTIFIKASI AIR LAUT TERHADAP AIR TANAH MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KELURAHAN MUNDAM KOTA DUMAI Mei Saroh; Usman Malik
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.61-68

Abstract

Seawater intrusion has a serious impact on the availability of clean water for the population. Indications of seawater intrusion in several locations in Mundam Village, Dumai City are shown by fluctuations in resident well water from fresh water to brackish water to salt water. This study aims to determine the seawater intrusion zone that occurs using the geoelectric method of the Schlumberger configuration in Mundam Village, Dumai City and to determine the water quality around the research area using several parameters, namely pH, salinity, total dissolved solid, and Turbidity. 1D data processing is carried out with progress software and a 1D cross-sectional model is obtained. This research was conducted on 2 tracks with a distance of 100 meters for each track. The results of the inversion using progress software can be seen that seawater intrusion occurs on line 1, the resistivity value is 0.46 Ωm with a depth of 14.74 – 22 m. Line 2 no longer contains seawater because the distance is more than 1 km from the coast. The depth of groundwater on track 2 is 15.09 – 22 m with a resistivity value of 1.59 Ωm so that at a distance of more than 1 km from the coast it is very good for residents to use drilled wells to get water suitable for consumption.
PEMANFAATAN LIMBAH BIOMASSA TEMPURUNG KELAPA UNTUK ALAT TEKNOLOGI PENGERING PAKAIAN BERBASIS ARDUINO UNO Mutia Febri Irdayanti; Krisman Krisman; Juandi Muhammad; Annisa Alqorina
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.97-102

Abstract

Research on the utilization of coconut shell biomass waste for clothes dryer technology based on Arduino Uno has been carried out using the experimental method. This Arduino Uno-based dryer technology uses biomass energy from coconut shells with a mass of 2,000 grams for thin clothes and 4,000 grams for thick clothes. Observations were made based on the amount of coconut shell mass and the type of clothing used at 10 minute intervals. The results for a mass of 2,000 grams of coconut shell reached the highest temperature value with an average source temperature of 61.32°C, an average temperature in the drying chamber of 54.53°C with a minimum humidity of 19.5%, while the results for a mass of 4,000 grams coconut shell reached the highest temperature value with an average source temperature of 100.46°C, an average temperature in the drying chamber of 94.62°C with a minimum humidity of 21.1%.
ANALISIS PREDIKSI CURAH HUJAN MENGGUNAKAN METODE JARINGAN SARAF TIRUAN BACKPROPAGATION DI KABUPATEN MUARO JAMBI Rustan Rustan; Tika Restianingsih; Ester Kristianti
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.31-38

Abstract

Rainfall is one of the important natural factors influencing flood and drought conditions, and directly affects regional water resources and agricultural production. In general, weather conditions in a place and time tend to vary, so information about weather conditions is needed through rainfall predictions. The prediction method used is the backpropagation artificial neural network (ANN) method which is arranged according to the learning algorithm that will be used. This study uses four stages, namely data collection, data preprocessing, data processing, and research data analysis. The secondary data used is rainfall from 2014-2022 in Muaro Jambi Regency. Based on the results of testing the number of neurons in the hidden layer, it shows that the more the number of neurons, the higher the error value generated. This is because the training function used is saturated. Where the training function used has parameters that can increase and decrease the value of the learning rate. Next, compare the predictions for 2022 between BMKG data and predictions for ANN backpropagation. Based on the analysis of predictions for 2022 for rainfall and humidity, an average accuracy of 97.82% is obtained. This shows that the result of the ANN method is quite good in predicting rainfall.
PENERAPAN EGG TRAY UNTUK MEREDUKSI TINGKAT KEBISINGAN PADA RUANG KELAS MTs ISLAMIYAH TANJUNG KASAU Suci Ramadhani Harahap; Mulkan Iskandar Nasution; Nazaruddin Nasution
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.20.2.159-164

Abstract

Noise can be reduced by using materials that can dampen and absorb sound. Sound absorbing materials have an important role in room acoustics. This study aims to apply egg trays to the walls of MTs Islamiyah Tanjung Kasau classrooms. The study was conducted by measuring the noise level before and after the implementation of the egg tray on open and closed doors and windows in the MTs Islamiyah Tanjung Kasau classroom at 20 different points. The source of the sound comes from the sound generated by the activity of vehicles on St. Sei Langgei Perk Village. Tanjung Kasau during school operating hours. The tool used to measure noise levels in this study is a sound level meter (SLM). Data processing uses Surfer Golden V16 Software to create a contour map of sound distribution. The noise level generated in the classroom before the implementation of the egg tray when the doors and windows were open and closed was 61.39 dB and 59.41 dB. These results did not meet the standards in accordance with KEPMENLH No. 48 of 1996 concerning the Noise Level Standard for Schools, which is 55 dB. Then an acoustic absorbing material was added to the classroom using egg tray material to reduce noise in the MTs Islamiyah Tanjung Kasau classroom. The noise level after the application of the egg tray in open condition is 53.47 dB, in closed condition is 49.99 dB.
PEMANFAATAN SENSOR PIEZOELEKTRIK SEBAGAI PENGHASIL SUMBER ENERGI LISTRIK ALTERNATIF MENGGUNAKAN TETESAN AIR HUJAN Dhani Yonata Hariyono; Nazaruddin Nasution
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.20.2.179-186

Abstract

Indonesia is a tropical country whose renewable energy sources have not been optimally explored and developed. The advantages of a tropical climate are rain and heat, which should be put to good use to become a renewable energy source. One of the beneficiaries is the energy produced by rainwater using piezoelectricity. With the pressure of rainwater on the piezoelectric, the piezoelectric can produce electrical energy that can be stored for use. The amount of energy that can be generated directly depends on the piezoelectricity used and the rainfall. The method used in this research is to do experimental testing. The generated electrical energy is stored in a 12 V dry battery which has been rectified from AC (alternating current) to DC (direct current) using rectifier diodes. The results of the electrical input voltage are processed using the Arduino Uno microcontroller via a voltage sensor and stored using a data logger shield with an SD card and data. The results of this study show that the largest voltage and current are generated at 110.5 mm rainfall and a voltage of 35.50 V and a current of 209.95 mA is obtained. While the smallest voltage and current are generated at 9 mm rainfall and obtained a voltage of 2.89 V and a current of 17.1 mA.
PENERAPAN SOLAR CELL TERHADAP PERINGATAN DINI BENCANA BANJIR BERBASIS IoT Masthura Masthura; Nazaruddin Nasution; Muhammad Rajali Harahap
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.20.2.187-192

Abstract

The purpose of this research is to find out how to design and build a flood early warning system so that it can be connected to the internet network can directly send information, design the Blynk application so that it can receive information, and to find out the flood early warning system that has been built using solar panels. The design of an internet of things-based water level monitoring tool using the blynk application requires several components, namely, arduino uno wifi, ultrasonic sensor HC-SR04, buzzer, led, LCD, Brushless pump dc, and solar panels. The results of measuring water levels using the HC-SR04 sensor have a low error rate with a comparison of the HC-SR04 sensor with a ruler of 1.97%. The time it takes to send the sensor reading notification is 4.42 seconds. A flood early warning system that is connected to the blynk has been realized, marked by the success of the system in measuring water levels and being able to send notifications to the blynk with the right size and status. There is also the average time of sending messages or data to the blynk application in all conditions using arduino uno WiFi is 4.42 seconds. From the results of testing data on solar panels without a load and using a load, the voltage and current of the solar panels are influenced by weather conditions, if the weather is cloudy, the voltage and current generated by the solar panels will decrease.
ANALISA SIFAT ELEKTROKIMIA ELEKTRODA SUPERKAPASITOR BERBASIS KARBON AKTIF DARI KULIT SINGKONG Eva Wahyuni Harahap; Eman Taer; Ari Sulistyo Rini
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.20.2.115-122

Abstract

Another problem from technological developments and advancements is the increase in population which causes increasingly complex waste management problems. One type of  urban waste is waste caused by industrial waste such as waste from processing cassava or cassava. The use of cassava peel as a precursor of activated carbon with a high specific capacitance value has been proven. The resulting carbon powder is converted in the form of pellets or monoliths using a hydraulic press without the addition of adhesives. The carbonization process is carried out from room temperature to 600°C in an N2 gas environment, while the physical activation process is carried out from 600°C to a high temperature of 850°C in a CO2   gas environment. Density analysis was reviewed as an initial evaluation of porous carbon electrodes. Furthermore, the electrochemical properties of the supercapacitor were evaluated  through three different techniques including cyclic voltammetry (CV), galanostatic charge discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques in a two-electrode system in 1 M H2SO4 electrolyte. The results of the research have obtained carbon electrodes from cassava peel waste through chemical and physical activation processes. After testing the electrochemical properties of the supercapacitor electrode, the specific capacitance value of the supercapacitor cell on the chemical activator ZnCl2 with a concentration of 0.3 M and 0.7 M, respectively, was 196 F/g, 176.7 F/g in the CV method of 183.62 F/g, 147.64 F/g on the GCD method and 135 F/g, 126.6 F/g on the EIS method. These results confirm that the cassava peel has the potential to be used as a porous activated carbon for the base material for supercapacitor electrodes.
ANALISIS PENURUNAN KADAR AIR GAPLEK MENGGUNAKAN ALAT PENGERING KABINET BERBASIS BIOMASSA TEMPURUNG KELAPA Peri Ridwan Nurhedi; Juandi Muhammad
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.20.2.123-126

Abstract

Gaplek is one of the processed cassava products by cutting it into pieces, soaking, and drying it. The drying process for making cassava is necessary because the water content in cassava determines the quality of processed cassava products, one of which is cassava flour. The drying method that can use to dry cassava is to use a cabinet dryer based on coconut shell biomass. In this research, cassava drying was carried out using a cabinet drying machine based on coconut shell biomass. The YL-69 sensor is added to measure moisture content automatically, and then the data read will be calibrated using data from measurements using the MD7822 Grain Moisture Meter sensor. The method used for this research is the experimental method. The coconut shell biomass used was 2500 grams, and the cassava sample used was 500 grams on each drying rack. This study's results indicate a very strong correlation between measuring moisture content using the YL-69 sensor and the Grain Moisture Meter MD7822, which can be seen from the average correlation value of 0.954601. In addition, there was a significant reduction in cassava mass after drying by 44.2%, which indicated that drying with this method could dry cassava optimally.

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