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Spektra: Jurnal Fisika dan Aplikasinya

spektra
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Published by Universitas Negeri Jakarta

ISSN : 25413384 EISSN : 25413392 DOI : -

Core Subject : Science, Engineering,

Aerospace Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

Arjuna Subject : -

Articles 7 Documents

Search results for , issue "Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023" : 7 Documents clear

AIRCRAFT TRAFFIC NOISE ANALYSIS AT KUALANAMU INTERNATIONAL AIRPORT MEDAN Indrayani, Indrayani; Rahayu, Tri; Siregar, Rizky; Rajagukguk, Juniastel; Dirza, Risvan
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083.01

This study was conducted to analyze and evaluate the noise generated by aircraft traffic at Kualanamu airport. Data collection was carried out by conducting a survey directly in the field by asking airport officials about the flight frequency at Kualanamu airport and measuring ground handling noise with a sound level meter. Furthermore, the data obtained were analyzed using Excel software. From the results of data processing, it is known what variables most affect ground handling noise at Kualanamu airport. Noise measurements were taken by PT. Angkasa Pura II (Persero) in an open area at Kualanamu airport, the noise that occurs is below the specified quality standard value, which is <80 dB based on the Minister of Transportation Decree No. 17 of 2005 (Sultan Syarif Kasim International Airport, while for Kualanamu International Airport there has not been a Ministry of Transportation Decree. Because both airports are international class and are located in the coastal area of Sumatra Island, it can be assumed that they have the same noise quality standards). Furthermore, noise measurements were taken by PT. Angkasa Pura II (Persero) in the domestic and international waiting room area that the noise that occurs is above the specified quality standard value, namely (45-55) dB Zone B, according to the regulation of the minister of health 718 of 1987.

DEVELOPMENT OF DC-DC BUCK CONVERTER FOR SOLAR PANEL ENERGY STORAGE THROUGH LOAD OPTIMIZATION AND FEEDBACK CIRCUIT Indrasari, Widyaningrum; Rama, Gusti; Setiadi, Rahmondia Nanda; Hasanah, Lilik; Sahari, Siti Kudnie
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083.02

Solar panels are crucial components in converting sun radiation into electrical energy through the photovoltaic effect. A solar panels cannot be connected directly to the load due to its low energy conversion efficiency and low output voltage. One of the methods used to control solar cells to operate efficiently at their maximum power point is MPPT. In this paper, we design a DC-DC converter by modifications of the Butterworth filter circuit and feedback circuit in the MPPT system for storing solar panel electrical using the Hill Climbing (HC) method. The device consists of a DC-DC buck converter circuit, two pieces of INA219 sensors, a DS18B20 temperature sensor, a MAX44009 light intensity sensor, a SD card module and a DS3231 RTC. The DC-DC buck converter circuit simulation is carried out to determine the optimal load. The load optimization was conducted by analyzing the AC simulation using Ltspice software. The magnitude of the output voltage ripple in nine different loads was observed. From the simulations performed, it was found that the 50 Ω load has an output voltage ripple of 8.96 mV and is smaller than the other loads. The main DC-DC buck converter circuit is designed using a butterworth low pass filter with a cut-off frequency of 1000 Hz (R = 50 Ω, L = 33.8 mH and C = 750 nF) and a feedback circuit with a cut-off frequency of 500 Hz is added. From the prototype measurement, it was found that the average output power was 3249,7 milliwatts and the average input power was 4779 milliwatts, thus the average efficiency was 68%. With these results, the DC-DC converter circuit configuration is suitable for use in electrical energy storage systems from solar panels that have high efficiency.

RICE SAMPLE VAPORIATION METHOD ON METER TESTING RESISTIVE WATER CONTENT BASED ON ULTRASONIC MIST Syahwir, Irawati Dewi; Dinny, Fauzia Nur; Ihsan, Firman Khoirul
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083.03

Percentage moisture content is an important factor in assessing the quality and quantity of agricultural commodities, such as rice. The measurement of moisture content is very important to evaluate the moisture content of rice, which directly affects its quality. However, the measurement of moisture content takes a long time, so it is necessary to have an evaporation method to shorten the time so that the moisture content of the sample is as required. In this study, the method chosen was the evaporation method with ultrasonic mist. The results showed that this ultrasonic fog controller evaporation system successfully increased the moisture content of rice samples according to the criteria needed to be used in resistive-type moisture meter testing. The ultrasonic mist controller evaporation system can increase the water content of rice samples according to the criteria needed for use in resistive-type moisture meter testing, with an average increase of 0.9% within 15 minutes, 3.4% within 30 minutes, and 4.1% within 1 hour.

SYNTHESIS AND CHARACTERIZATION ANALYSIS OF FE3O4/SiO2 CORE SHELL Cassia, Diva; Sugihartono, Iwan; Isnaeni, Isnaeni; Soewoto, Haswi Purwandanu; Alaih, Akhmad Futukhillah Fataba; Triyono, Djoko; Mohar, Rahmat Setiawan; Tiam, Tan Swee
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083.04

Fe3O4/SiO2 core shell synthesis has been carried out, and its characteristics has been analyzed to be used as a photocatalyst using co-precipitation and sol-gel method. Fe3O4 is used as the core material to eliminate the difficulty of separating the photocatalyst powder from the solution medium, SiO2 is used to avoid oxidation by preventing the Fe3O4 core from coming into direct contact with the solution. The samples were then characterized using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Vibrating Sample Magnetometer (VSM). The XRD and FTIR results showed that the crystal structure and movement of the sample molecules matched the standard characteristics from previous studies. The VSM characterization results show that SiO2 succeeded in reducing the value of the magnetization of Fe3O4, which proves that Fe3O4 has been successfully coated by SiO2.

IMPLEMENTATION OF GABELLA METHOD AND RANDOM FOREST FOR GROUND CLUTTER DETECTION IN PADANG WEATHER RADAR DATA Nurahman, Wildan; Ali, Abdullah; Fahdiran, Riser
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083.05

Weather radar is an active remote sensing instrument for various hydrological and meteorological applications. One advantage of weather radar is its ability to detect rainfall in space and time with high spatial resolution. However, one of the issues that contaminate radar observations is ground clutter. Ground clutter is a signal or echo from non-meteorological objects on the earth’s surface that are stationary in the time domain. Detecting and mitigating clutter effects is crucial to achieve precise weather measurements. This research aims to implement the Gabella and random forest methods to detect ground clutter in Padang weather radar data and determine the optimal method between the two. The implementation of the Gabella method for detecting ground clutter in Padang weather radar data was suboptimal. This was due to the most duplicated data at the same point being only 15.97% of the total data. Meanwhile the random forest method obtained a kappa value of 92.03%. This indicates that the random forest model created using 2000 trees as the parameter performs well. Based on these results, the random forest method identified as the most optimal approach for detecting ground clutter in Padang weather radar data.

FRONT MATTER SPEKTRA VOLUME 8 ISSUE 3, DECEMBER 2023 Spektra, Editor
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.08300

BACK MATTER SPEKTRA VOLUME 8 ISSUE 3, DECEMBER 2023 Spektra, Editor
Spektra: Jurnal Fisika dan Aplikasinya Vol. 8 No. 3 (2023): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 8 Issue 3, December 2023
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.083111

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