Komunikasi Fisika Indonesia
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).
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<![CDATA[PEMISAH AIR DAN CRUDE PALM OIL DENGAN METODE ADSORPSI MENGGUNAKAN SENSOR WARNA TCS3200 DAN SENSOR PHOTODIODE BERBASIS ARDUINO UNO ]]>
<![CDATA[Muhammad Iqbal Zailany Nasution]]>;
<![CDATA[Mulkan Iskandar Nasution]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.165-170
<![CDATA[To lessen financial damages brought on by industrial mishaps, a device that can recycle or reuse oil emissions mixed with water is required. The purpose of this study was to evaluate the sensor readings for crude palm oil (CPO) oil thickness, presence, and tool effectiveness in separating CPO oil from water. photodiode and the tool's effectiveness in separating the water and oil in CPO. The red frequency value on the TCS3200 color sensor reading increases as the thickness of the oil in the tank increases. The percentage deviation value of the CPO oil volume generated from these results is 9.7%. Before suction or the laser still penetrates the water, the photodiode sensor's light intensity reading is 74, and when it is exposed to oil, the reading is 0. The CPO oil thickness test findings show that as the CPO oil thickness increases, so does the red frequency value on the sensor. The photodiode sensor's laser light reception intensity is 74 when it detects water, and 0 when it detects oil. According to test data, the gadget has a 90.3% success rate in separating water and oil.]]>
<![CDATA[ANALISIS TINGKAT KEMATANGAN BUAH SAWIT DENGAN INJEKSI TEGANGAN SEARAH ]]>
<![CDATA[Dino Yanuardi]]>;
<![CDATA[Saktioto Saktioto]]>;
<![CDATA[Romi Fadli Syahputra]]>;
<![CDATA[Defrianto Defrianto]]>;
<![CDATA[Yan Soerbakti]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.109-114
<![CDATA[Palm fruit is Indonesia's main communiqué as the largest foreign exchange contributor processed into crude palm oil (CPO). However, the quality of CPO that will be produced is influenced by the right level of maturity of palm fruit so as not to cause losses from the processor. Losses from the palm fruit processing can be overcome using a method that can determine the maturity level of the palm fruit, one of which is by injecting the voltage in the direction of the palm fruit. The purpose of direct voltage objection to the function of time in the palm fruit is to obtain a voltage response relationship to the content of yield, moisture content and free fatty acid (ALB) in the palm fruit. In this study, palm fruit was classified into 4 levels of maturity, namely unripe, almost ripe, ripe and overripe given direct voltage injection of 9 Volts for 1 minute with 3 repetitions using four electrodes arranged parallel to obtain an electrical voltage response with an electrode diameter of 1.4 mm. The distance between electrodes was chosen to be 4 – 6 mm from stainless steel materials, and the depth of the electrode to the palm fruit is 3 – 5 mm. Palm fruit was injected with electrical voltage and obtained the value of voltage response, electric current, resistivity and power of each level of maturity. The electrical information obtained will explain the yield content, water content and ALB in palm fruit in accordance with the classification of ripeness. The results of the study obtained, that the palm fruit is said to ripen when it has a voltage response value of 0.586 – 0.765 V, electric current 385 – 404.9 μA, resistivity 40.197 – 54.523 Ωm, and power 0.238 – 0.299 mW. The results showed that the maturity level of palm fruit based on its chemical content affects the properties of electricity.]]>
<![CDATA[STUDI PENERAPAN AKUSTIK PADA GERBONG KERETA API SRI LELAWANGSA ]]>
<![CDATA[Riri Angriani Nasution]]>;
<![CDATA[Zubair Aman Daulay]]>;
<![CDATA[Abdul Halim Daulay]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.171-178
<![CDATA[This study aims to determine the noise level in the Sri Lelawangsa train carriage without the addition of sound-absorbing materials and to determine the thickness of the sound-absorbing material needed to meet the acoustic comfort standard if it is simulated in a sample testing room. Noise level measurements were carried out on the Sri Lelawangsa train carriages in conditions without the addition of sound-absorbing materials. This noise level measurement was carried out in three carriages of the Sri Lelawangsa train, namely the train carriage, engine carriage, and passenger carriage, the source of noise comes from outside and inside the Sri Lelawangsa train. The study of the application of acoustics was carried out in a sample testing room made of cardboard boxes with a length of 34cm, width 25, cm and height 32 cm, and the source of noise in the sample testing room was the speaker. The absorbent material used to meet the acoustic comfort standard is pyramidal foam which is placed on the nearest side of the sound source. The measuring instrument used to measure noise on the Sri Lelawangsa train is a sound level meter and the Surfer Golden V16 software is used to describe the distribution of sound in the Sri Lelawangsa train carriage. The noise level on the Sri Lelawangsa train still exceeds the quality standard set by the Regulation of the Minister of Transportation of the Republic of Indonesia No. 75 of 2015 which is 80 dB. The highest noise level in the passenger car is at point (1) 82.81 dB. The machinist carriage is 84.70 dB, and the engine carriage is at point (2) 88.92 dB. After measuring the reverberation time on the Sri Lelawangsa train carriage, it is known that the surface area of the sound absorbing material needed to meet the reverberation time standard on the Sri Lelawangsa train carriage is 34,83 m3 with an absorption coefficient (α) of 0.58 according to with the provisions of SNI 03-6306-2000.]]>
<![CDATA[SINTESIS FISIKOKIMIA DARI KARBON AKTIF BERBASIS BIOMASSA SABUT NIPAH (Nypa fruticans) UNTUK PERFORMANSI KINERJA SUPERKAPASITOR ]]>
<![CDATA[Irma Apriyani]]>;
<![CDATA[Rakhmawati Farma]]>;
<![CDATA[Awitdrus Awitdrus]]>;
<![CDATA[Aria Yunita]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.127-134
<![CDATA[Biomass-based activated carbon materials provide a new approach for the development of high-performance electrode materials for supercapacitor cells. In addition, the carbon materials are low cost and sustainable for large-scale production of electrode materials. In this study, carbon electrodes made from nipa palm (Nypa fruticans) coir were synthesized physicochemically. The pore size distribution of the carbon electrodes can be adjusted with the increased CO2 activation temperature (700°C, 800°C, and 900°C). The results showed that the SN-800 carbon electrode had the lowest density shrinkage and showed excellent electrochemical performance. The highest specific capacitance was obtained at 247 F/g at a current density of 1 A/g in a symmetrical two-electrode system. This work provides an efficient strategy for the preparation of high performance carbon electrodes based on nipa coir biomass.]]>
<![CDATA[PENGARUH GELOMBANG MIKRO DAN SULFUR SEBAGAI AGEN PASIVASI TERHADAP SPEKTRUM ABSORBANSI KARBON DOTS BERBASIS BAN BEKAS ]]>
<![CDATA[Ananda Tira Septiana Sari]]>;
<![CDATA[Ety Jumiati]]>;
<![CDATA[Miftahul Husnah]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.147-152
<![CDATA[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.]]>
<![CDATA[PENERAPAN EGG TRAY UNTUK MEREDUKSI TINGKAT KEBISINGAN PADA RUANG KELAS MTs ISLAMIYAH TANJUNG KASAU ]]>
<![CDATA[Suci Ramadhani Harahap]]>;
<![CDATA[Mulkan Iskandar Nasution]]>;
<![CDATA[Nazaruddin Nasution]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.159-164
<![CDATA[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.]]>
<![CDATA[PEMANFAATAN SENSOR PIEZOELEKTRIK SEBAGAI PENGHASIL SUMBER ENERGI LISTRIK ALTERNATIF MENGGUNAKAN TETESAN AIR HUJAN ]]>
<![CDATA[Dhani Yonata Hariyono]]>;
<![CDATA[Nazaruddin Nasution]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.179-186
<![CDATA[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.]]>
<![CDATA[PENERAPAN SOLAR CELL TERHADAP PERINGATAN DINI BENCANA BANJIR BERBASIS IoT ]]>
<![CDATA[Masthura Masthura]]>;
<![CDATA[Nazaruddin Nasution]]>;
<![CDATA[Muhammad Rajali Harahap]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.187-192
<![CDATA[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.]]>
<![CDATA[ANALISA SIFAT ELEKTROKIMIA ELEKTRODA SUPERKAPASITOR BERBASIS KARBON AKTIF DARI KULIT SINGKONG ]]>
<![CDATA[Eva Wahyuni Harahap]]>;
<![CDATA[Eman Taer]]>;
<![CDATA[Ari Sulistyo Rini]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.115-122
<![CDATA[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.]]>
<![CDATA[ANALISIS PENURUNAN KADAR AIR GAPLEK MENGGUNAKAN ALAT PENGERING KABINET BERBASIS BIOMASSA TEMPURUNG KELAPA ]]>
<![CDATA[Peri Ridwan Nurhedi]]>;
<![CDATA[Juandi Muhammad]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 20, No 2 (2023) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.20.2.123-126
<![CDATA[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.]]>
