JFT: Jurnal Fisika dan Terapannya

Ekstraksi Frekuensi dari Bunyi Alqurans dengan Metode Discrete Fourier Transform: Studi Kasus Bunyi QS. Al-Fatihah

Amirin Kusmiran — 2024-02-06

The Quran is a miracle received by the Prophet Muhammad. Alquran can use to reduce anxiety in patients with acute coronary syndrome, hemodialysis, schizophrenia, etc., when the sound retardation of this Qur'an, especially QS. Al-Fatihah. The physical properties of waves can be analyzed using the discrete Fourier transform method for frequency extraction. This method is scripted using the Python programming language. The results show that frequency in Qs. Al-Fatihah/1:1-7 are random in range 150 Hz – 800 Hz.Thus, the frequencies of the Quran, especially QS Al-Fatihah, are uneven waves that can cause harmonic vibrations against brain waves.

Analisis Momen Tensor dan Mekanisme Fokus Gempa di Sumatera Barat Menggunakan Metode Inversi Waveform

Zakiah Putri Putri — 2024-07-01

Analysis of the tensor moment and focal mechanism of an earthquake aims to determine the value of the tensor moment that represents the direction of the force that causes the earthquake and the focal mechanism that describes the characteristics of the fault motion that causes the earthquake. Analysis of the tensor moment and focal mechanism is carried out using the waveform inversion method. The waveform inversion method is an inversion method that utilizes the P-wave arrival time and is estimated with a Green's function involving three seismogram components. The data used in this study are ten earthquake data in the West Sumatra region in 2007-2022 whose earthquake sources are in the Sumatra fault zone with earthquake strength ≥4.9 Magnitude. The results of this study obtained a range of tensor moment values, namely M₁₁ = -2.595 to -4.555, M₂₂ = 1.743 to 4.476, M₃₃ = 0.853 to 0.079, M₁₂ = 6.258 to -4.814, M₃₁ = 1.241 to 0.719, M₃₂ = 0.530 to -1.436, and the results of the focus mechanism obtained are strike-slip patterns.

Rancang Bangun Insinerator Pengolahan Sampah dengan Penerapan Teknologi Termal yang Ramah Lingkungan

Prasepvianto Estu Broto — 2024-06-30

Concerns about environmental problems such as increasing the volume of waste which if not treated properly will affect environmental pollution which can damage soil fertility and also have an impact on human health. This study aims to make a waste processing incinerator with the application of thermal technology. Oil and water stoves are used as media for burning waste, the stove will burn the waste that has been put into the combustion chamber made of drums coated with clay. This clay coating aims to increase the temperature of the combustion chamber so that maximum combustion is obtained with minimal smoke. From the waste burning test, the temperature measurement results in the combustion chamber reached 751ºC. Carbon gas measured at the maximum temperature around the incinerator is 27 ppm. From the data obtained, it can be concluded that waste burning with an incinerator has been made to minimize air pollution so that it can be used for solutions in environmentally friendly waste processing.

Uji Kesesuaian Kinerja dan Analisis Reproduksibilitas Akurasi Tegangan Tabung Pesawat Sinar-X di Balai Pengamanan Alat Fasilitas Kesehatan Makassar

Nur Isnaeni — 2024-06-30

The X-ray beam collimation test, voltage accuracy test, reproducibility test, and fourth is the X-ray beam output test (Half Value Layer) on the Mobile X-ray aircraft. This testing aims to determine the standards that have been set. Tests that have been carried out on the illumination and the difference between the collimation field of the beam and the X-ray beam show that the results obtained have passed the test on an X-ray aircraft. Both tests are in accordance with established standards. Reproducibility testing is carried out by measuring the radiation output (mGy) at the same settings repeatedly. The data shows a corrected mean of 0.075 mGy with a standard deviation of 0.0034, indicating that the X-ray aircraft has good reproducibility in producing consistent radiation output. The mobile X-ray unit tested had sufficient accuracy and reproducibility that complied with established standards and demonstrated the reliability of the device in clinical practice. X-ray beam output testing was carried out and a corrected HVL value was obtained which was greater than the test pass value. The results obtained are in accordance with established standards.

Analisis Perbedaan Gelombang Bunyi Pada Air dengan Software "Frequency Counter"

Vania Yoni Fahmala — 2024-07-01

The process of learning physics can be in the form of conducting a research or experiment so that the results will become a new understanding concept contained therein. The use of the experimental method is intended to be able to observe directly various kinds of phenomena that occur in physics. The purpose of this study is to observe the difference in sound from each glass filled with water with a different volume, to analyze the frequency and period, and to describe the phenomena that occur in experiments with the help of ''frequency counter'' software. This experiment was carried out by filling three glasses with water of different volumes and hitting one side of the glass using a weight attached to a support with a rope. Simultaneously operate the ''frequency counter'' software to determine the difference in frequency of each glass. The research results obtained, the three glasses produce sounds that have different frequencies and periods, namely for the first glass (1758.21 Hz); (0.73672 m/s), second glass (2158.35 Hz); (0.45727 m/s), third glass (2170.69 Hz); (0.39740 m/s). Also, the phenomenon that occurs is diffraction (bending).

Analisis Suseptibilitas Magnetik Tanah Perkebunan Apel di Kecamatan Pujon Kabupaten Malang

Rikardus Feribertus Nikat — 2024-07-18

This research aims to analyze the magnetic susceptibility value of apple plantation soil to determine the magnetic value as a representation of the heavy metal content on the soil surface due to pesticide residues. This research was carried out by taking samples at nine predetermined points. Each sample was taken from the ground surface at varying depths of 10 cm, 20 cm, and 30 cm. The total number of samples was as large as samples and tested for magnetic susceptibility values at the central laboratory of the State University of Malang. The average value of low-frequency magnetic susceptibility per mass χ_LF is 673.642 x 10-8m^3/kg, and the average value of high-frequency magnetic susceptibility per mass χ_HF is 649.0473 x 10-8 m^3/kg. The average frequency-dependent magnetic susceptibility value χ_FD per mass is 2.04%. The surface soil of plantations contains high concentrations of ferrimagnetic minerals in the form of magnetite and maghemite with grain properties in the form of multi-domain (MD) and superparamagnetic (SP).

Analisis Kondisi Atmosfer Saat Kejadian Hujan Es (Studi Kasus: Kejadian Hujan Es Tanggal 29 November 2023 di Kabupaten Timor Tengah Selatan)

Maulidianto — 2024-08-14

Hail is an extreme weather phenomenon that rarely occurs in Indonesia. On November 26, 2023, there was heavy rain accompanied by hail in the Kapan area, South Central Timor Regency, East Nusa Tenggara at around 13:30 WITA. Further research on extreme events is needed to anticipate future extreme weather events. This study aims to analyze atmospheric conditions when hail occurs in the Kapan area on November 26, 2023. Research methods include analysis of field observation data, ECMWF ERA5 numerical modeling data, and Himawari-9 weather satellite image data. Based on observational data, hail occurs under unstable atmospheric conditions, such as a significant decrease in surface temperature, high humidity, and a significant decrease in atmospheric pressure before the event. Analysis of the vertical profile of the atmosphere based on model data showed that divergence, vertical velocity and relative humidity favored the formation of convective clouds. Satellite images showed that the temperature at the top of the cumulonimbus clouds during the ice storm was very low (-75.8°C). In addition, convective cloud cover (CCO) analysis confirmed the presence of cumulonimbus clouds covering the Kapan region during the hail period. All three methods can well describe the atmospheric conditions during hail events, these results are expected to provide insight into the atmospheric factors that contribute to the occurrence of hail in tropical regions such as Indonesia and can be used to better understand and mitigate the negative impacts of these extreme weather events.

Pemanfaatan Citra Satelit dan Data Geolistrik untuk Zonasi Daerah Rawan Longsor di Kecamatan Walenrang Barat Kabupaten Luwu

Ranir Atfar R — 2024-09-03

This research aims to identify areas prone to landslides and landslide slip areas in West Walenrang District, Luwu Regency. The method used to determine landslide-prone areas is the scoring and overlay method, while to identify landslide slip areas using the dipole dipole configuration geoelectric method with a measurement path length of 100 m. The data used in scoring and overlaying are land cover data obtained from Landsat 8 satellite imagery, rainfall data and slope slope data originating from DEMNas. The results of this research show that most of the West Walenrang District is an area with a very high level of landslide vulnerability. The distribution of landslide-prone areas in West Walenrang District is in the low category, namely in Lewandi Village and Ilan Batu Village. Areas of moderate vulnerability are spread across a small part in Lewandi Village, Lamasi Hulu Village, Pasang Village, Lempe Village, Ilan Batu Uru Village, and Ilan Batu Village. Areas with high vulnerability are Lempe Village and Pasang Village. Meanwhile, areas with a very high level of vulnerability are spread across most of West Walenrang District, including Lewandi Village, Lamasi Hulu Village, Pasang Village, Lempe Village, Ilan Batu Uru Village, and Ilan Batu Village. The landslide slip area is interpreted as basalt rock which has a resistivity of 2,925 Ohm - 18,585 Ohm.m with a slope of 25.47o at a depth of 5.13 m - 17 m. The resulting landslide potential is in the form of a rotational type landslide.

Pemodelan 2D Struktur Geologi Bawah Permukaan di Daerah Manifestasi Panas Bumi Buaran, Kabupaten Brebes, Berdasarkan Anomali Magnetik

Putri Safrilia — 2024-09-30

Buaran Village is one of the villages in Brebes Regency that has a geothermal manifestation. This research aims to observe the subsurface geological structure of the Buaran geothermal manifestation area and its surroundings based on the distribution of magnetic anomalies. The digitization process was conducted on the Majenang sheet magnetic anomaly map published by the Geological Survey Centre which has made daily corrections and International Geomagnetic Reference Field (IGRF) corrections. The 2D modeling was performed on the residual magnetic anomaly obtained from the subtraction of the total magnetic anomaly from the reduction to the pole with the regional magnetic anomaly from the upward continuation. The distribution of residual magnetic anomalies obtained is -323.6 nT to 504.2 nT. Low anomalies are distributed in the northeast-southeast with values of -323.6 nT to -22.7 nT, while high anomalies are distributed in the north-south with values of 166.9 nT to 504.2 nT. 2D modeling results show subsurface geological structures in the form of fault structures, anticline folds, and syncline folds. Geothermal manifestations in the Buaran area are formed by the intrusion of igneous rocks as heat sources, and fault structures as hydrothermal fluid pathways.