JFT: Jurnal Fisika dan Terapannya

Temporal Analysis of Rainfall Characteristics in Response to Climate Change in the Special Region of Yogyakarta Province

Imawan Mashuri, Fadhli Aslama Afghani, Ofana Tri Wibowo — Mon, 06 Jan 2025 15:17:36 +0000

Climate change has resulted in uneven rainfall variations. The temporal analysis of rainfall in the Special Region of Yogyakarta Province was conducted through the calculation of monthly averages, seasonal averages, and annual trends using the Climate Data Operator (CDO) and Microsoft Excel application over 60 years from 1961 to 2020, utilizing ERA5 data. The time frame is divided into two periods: 1961-1990 and 1991-2020, aiming to observe rainfall characteristics such as changes, patterns, and trends that occurred during these intervals. The highest monthly average rainfall occurs in January for both periods, registering 378 mm for 1961-1990 and 370 mm for 1990-2020. In contrast, the lowest monthly average occurs in August, with values of 51 mm for 1961-1990 and 38 mm for 1991-2020. The highest seasonal average rainfall occurs during the DJF period, with values of 945 mm for 1961-1990 and 1022 mm for 1991-2020. However, the lowest seasonal average occurs during the JJA period, with values of 228 mm for 1961-1990 and 191 mm for 1991-2020. The rainfall trend shows an increase for the first period (1961-1990), whereas decreases in the second period (1991-2020), including wet seasons, dry seasons, and annual. The result can be associated with climate change, where there are occurrences of extremely wet and extremely dry seasons. Overall, the Special Region of Yogyakarta province experienced continuous yearly rainfall from 1961 to 2020.

Desain Sistem Monitoring Kelembapan Tanah, Suhu, dan Intensitas Ultraviolet Menggunakan Arduino Mega 2560 Berbasis Internet of Things (IoT)

Subur Pramono, Miftahul Ulum, Rudiana, Ramona Dyah Safitri — Sun, 02 Feb 2025 03:40:30 +0000

We have successfully developed a monitoring system of soil moisture, temperature, and ultraviolet based on the Internet of Things (IoT) using Arduino Mega 2560. The sensors used to measure soil moisture, temperature, and ultraviolet are the soil moisture sensor, DHT-11 sensor, and GY-ML8511 sensor. Node MCU ESP8266 application is used to communicate between Arduino Mega 2560 and smartphones. Outputs of soil moisture sensors are connected to the water pump and blower. The water pump is on when soil moisture is below 60% and else it is off, the blower is on when soil moisture is above 80%. In this study, we don’t use the time parameter in the water pump or blower. Meanwhile, temperature and ultraviolet sensors were just used to monitor the system considered. The largest ultraviolet intensity measured by ML8511 sensors is squared at the value ADC is 123 and voltage 1,01V. Based on the testing system, it was obtained that the system is optimally operated

Sintesis Hidroksiapatit Berbahan Tulang Ikan Layar (Istiophorus Platypterus) Menggunakan Metode Presipitasi

Uwais Al-Qarny, Nurlaela Rauf — Mon, 03 Feb 2025 07:06:43 +0000

Sailfish bone is one of the marine biological wastes that has potential as a source of hydroxyapatite for biomedical applications. This study aims to synthesize hydroxyapatite made from sailfish bone through precipitation method with the effect of variation in calcium precursor mass and phosphate precursor concentration. Sailfish bones were calcined at 900ºC for 3 hours, then reacted with (NH₄)₂HPO₄. The solution was adjusted to pH 8 using NaOH, precipitated for 24 hours at room temperature to produce a homogeneous precipitate, washed with aquades, and filtered. The precipitate was then dried at 100ºC for 2 hours to produce hydroxyapatite. FTIR characterization showed the presence of PO₄^3-, OH^-, and CO₃^2- groups in all three samples. Sample C has higher absorption intensity of PO₄^3- and OH^- groups than the other two samples. The higher absorption intensity indicates more content of PO₄^3- and OH^- groups. XRD analysis showed that the three samples had dominant hydroxyapatite phase. In addition to the hydroxyapatite phase, there is also A-type carbonate apatite phase and B-type carbonate apatite phase. Sample C has the largest average crystal size, which is 28.94 nm.

Kajian Konsep Fisika Kinematika Gerak pada Hero Khufra (Skill Tyrent’s Revenge) dalam Game Online Mobile Legends Bang Bang

Mon, 03 Feb 2025 07:43:50 +0000

In the Mobile Legends Bang Bang game, one aspect related to motion kinematics is the charging time for the hero Khufra, which influences the distance of displacement from the starting point to the endpoint. As a result, it is necessary to study the concept of kinematic motion in this game, particularly focusing on the use of Khufra's Tyrent's Revenge skill. This study aims to explore the concept of motion kinematics in Mobile Legends Bang Bang and examine how the charging duration of Khufra's Tyrent’s Revenge skill affects the displacement distance. The research utilizes data in the form of video recordings showcasing the use of Tyrent’s Revenge by Khufra in the game. The videos are analyzed using video tracking software that can generate visualization of graphs, time, and distance of movement. The data obtained is then entered into Excel software to determine the linear regression curve and calculate the R-Squared (R^2) value. The results of this research show that in the game Mobile Legends Bang Bang, the kinematics of motion can be described through the displacement distance of the Khufra’s hero from the starting point to the end point. The analysis results indicate a linear regression curve with the equation y = 0.4422x - 1.0723 and an R² value of 0.9757. A value of R² approaching 1 indicates a strong influence of launch time on the displacement distance of Khufra’s hero.

Potensi Pemanfaatan Limbah Tulang Ikan Sunu (Plectropomus Leopardus): Analisis FTIR dan XRF untuk Karakterisasi Serbuk Material

Sun, 09 Feb 2025 04:14:10 +0000

This study aims to investigate the potential utilization of fish bone waste from Sunu as a material source through characterization analysis using FTIR (Fourier Transform Infrared Spectroscopy) and XRF (X-ray Fluorescence). The results of the FTIR analysis show characteristic peaks indicating the presence of important functional groups such as hydroxyl, phosphate, and carbonate. The presence of calcium phosphate as a major component suggests the potential of this bone powder for biomedical applications, such as the production of bone implants and bioceramic materials. Additionally, the XRF analysis reveals high concentrations of calcium (84.8%) and phosphorus (13.5%), along with other relevant oxides, indicating its potential use as a nutritional supplement and building material. Overall, this study demonstrates that fish bone powder from Sunu holds significant potential for applications in the fields of health, food, and composite materials, while also supporting sustainability in fisheries waste management.

Kualitas Biobriket Variasi Komposisi Tempurung Kelapa, Kulit Kacang Tanah, dan Tinja Sapi sebagai Sumber Energi Alternatif

Aan Safitri, Sahara Sahara, Jumardin Jumardin — Mon, 10 Feb 2025 03:55:10 +0000

Penelitian fokus pada pengujian biobriket dari komposisi arang tempurung kelapa, kulit kacang tanah, dan tinja sapi dengan perekat tepung kanji. Penelitian ini bertujuan untuk mengetahui kualitas briket yang meliputi parameter kerapatan, kadar air, kadar abu, dan nilai kalor berdasarkan standar SNI. Penelitian ini menggunakan metode karbonisasi untuk tempurung kelapa dan kulit kacang dan pada perlakuan bahan tinja sapi menggunakan metode tanpa karbonisasi. Hasil penelitian menunjukkan bahwa nilai kadar air, kadar abu dan nilai kalor optimal diperoleh pada sampel D masing-masing sebesar 3,5%, 1% dan 5483,26 kal/gram. Untuk pengujian nilai kerapatan briket dari rentang 0,58 gr/𝑐𝑚³ sampai 0,77 gr/𝑐𝑚³. Dari keseluruhan komposisi semuanya memenuhi standar SNI briket dengan sampel terbaik pada komposisi sampel D yang terdiri dari 45% tempurung kelapa, 30% kulit kacang tanah, 15% tinja sapi dan perekat sebanyak 10%.

Karakterisasi Gugus Fungsi dan Sifat Fisik Komposit ZnO-PVA-Pati dari Kulit Pisang Goroho sebagai Bioplastik Antibakterial

Wed, 12 Feb 2025 02:53:39 +0000

Plastic is one of the most widely used materials in everyday life to support various activities due to its versatile characteristics and functions. Bioplastic is one type of plastic that is easily decomposed naturally by microorganisms so that it becomes a more environmentally friendly compound. This study aims to analyze the characterization of functional groups and physical properties in goroho banana peel starch-based bioplastics with the addition of ZnO and PVA. The method used in this research is laboratory experimental method. The potential of goroho banana peel waste is abundant in Gorontalo Province and the starch content in goroho banana peel is 80.89%, so this research uses starch extracted from goroho banana peel with variations of ZnO addition (0.2%, 0.4%, 0.6%, 0.8%, 1%). The results showed that the addition of ZnO and PVA affected the functional groups and physical properties of bioplastics. The physical properties of bioplastics produced are in accordance with SNI standards, namely the amount of water uptake ranging from 1.39 to 8.21% and the length of bioplastics degraded on average less than 30 days.

Analisis Kondisi Peta Persebaran Pencahayaan dan Kebisingan di PT. Pamapersada Nusantara Distrik Baya Menggunakan Software Surfer

Andrian R, Rahmawati Munir, Devina Putri, Wardani Wardani, Mislan Mislan — Thu, 13 Feb 2025 08:43:15 +0000

This research was motivated by the issues of lighting and noise in the mining company. Insufficient lighting could lead to accidents and eye strain, while noise from heavy machinery could cause health problems and reduce workers' performance. Therefore, this study aimed to identify and map areas with levels of lighting and noise at PT. Pamapersada Nusantara Distrik Baya, as well as to analyze the distribution map based on SNI 16-7062-2004 for lighting and SNI 8427:2017 for noise. The results of the study showed that there was a variation in lighting and noise levels in different areas, caused by factors such as light source obstructions like large parked units in the measured area and working hours. Areas with suboptimal lighting often hindered workers' tasks, while areas with high noise levels posed a risk of hearing loss. The conclusion of this study indicated that the variation in lighting and noise levels in the work areas of PT. Pamapersada Nusantara Distrik Baya was significantly influenced by environmental conditions during working hours. The recommendations provided by PT. Pamapersada Nusantara Distrik Baya to improve employee comfort and performance included the equalization and maintenance of lighting and noise infrastructure.