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All Journal Buletin Udayana Mengabdi Bumi Lestari Jurnal Keselamatan Radiasi dan Lingkungan Jurnal Fisika FLUX Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Physical Review Kappa Journal BULETIN FISIKA
I Gde Antha Kasmawan
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Udayana University, Indonesia
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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Metode Double-Difference Untuk Merelokasi Hiposenter Gempabumi Susulan Seririt Singaraja Baskoro, Winardi Tjahyo; Kasmawan, I Gde Antha; Putra, I Ketut; Ratini, Ni Nyoman; Sismanto
Kappa Journal Vol 8 No 1 (2024): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i1.24434

Abstract

A method that does not require a main earthquake (master event) that can be used simultaneously to relocate a very large number of earthquakes with wide hypocenter separation is called the double-difference method. A method used to relocate the aftershocks in Seririt Singaraja on November 14 2019 with coordinate positions 113.478 – 115.181 East Longitude and 8.357 – 7.894 South Latitude. The earthquake data used in this research was accumulated from 85 BMKG seismic stations. Data analysis uses cross-correlation time differences which can increase the accuracy of travel time between the receiving station and the earthquake, thereby reducing errors in calculations. The double difference method used to relocate the earthquake in the Seririt Singaraja area showed that there was a shift in the location of the earthquake hypocenter before and after it was relocated. Horizontally and vertically, the distribution of earthquake hypocenters before and after being relocated occurs when there is a collection of location shifts. The results of this research were able to relocate 152 aftershocks properly. The main earthquake after being relocated was at a depth of 17 km, while the distribution of aftershocks was at a depth of around 6-25 km, so that it can more accurately describe the position of the earthquake source and is able to show clearer and easier to interpret structural patterns.
Solution of Time-Independent Schrodinger Equation (TISE) by Using Finite Difference Approach Widagda, I Gusti Agung; Artawan, Nengah; Kasmawan, I Gde Antha; Suharta, I Wayan Gede; Nurmalasari, Ni Putu Yuni
BULETIN FISIKA Vol. 26 No. 1 (2025): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2025.v26.i01.p02

Abstract

This research investigates the numeric solution of the time-independent Schrödinger equation for the quantum harmonic oscillator by finite difference approach. The harmonic oscillator, described by a quadratic function potential, is a fundamental model in quantum mechanics due to its broad applications, ranging from molecular vibrations to quantum field theory. The time-independent Schrödinger equation is a second-order differential equation that typically poses challenges when solved analytically for complex potentials. The finite difference method become an attractive choice as it transforms the continuous differential equation into a system of linear equations that can be computationally solved through computer programming code. In this study, the spatial domain is discretized, and the second derivative is calculated by using central differences, transforming the TISE into a tridiagonal matrix representing Hamiltonian of system. By finding solutions to this matrix eigenvalue problem, wavefunctions and eigenvalues are obtained. The study results demonstrate that the finite difference approach effectively solves the TISE for the harmonic oscillator. The results obtained by using the finite difference method closely approximate the analytical results. The linear regression results show respectively that the gradient (β1), regression coefficient (β0) and coefficient of determination (R²) approach ideal values of 1, 0, and 1. The z-test results also show that the value of calculated z < critical z, indicating that the wavefunction and probability density, whether estimated by using finite difference approach or analytical methods, are equivalent with confidence level of 95 percent.
Penyelesaian Persamaan Schrodinger Tidak Bergantung Waktu Dengan Metode Finite Difference I Gusti Agung Widagda; I Nengah Artawan; Wayan Gede Suharta; I Gde Antha Kasmawan
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 3 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i3.19289

Abstract

The solution of time-independent Schrodinger equation (TISE) has been studied by several researchers. In this research, a TISE solution is found by using the finite difference method which is implemented in computer program code by using the Python language. TISE in the form of a second order differential equation is solved by using the finite difference method. In order to normalize the resulting wave function it is necessary to divide it by square root of the integral of the squared wave function. The integral method used is the Riemann method. In order to prove quantitatively that the TISE solution of the finite difference method is the same as or close to that of the analytical method, it is carried out by using linear regression and the z test. The research results show that the linear regression results from the two methods are nearly close. This is able to be seen from the values of  gradient (m), intercept (c) and coefficient of determination (R2) which are close to ideal values, namely, 1, 0 and 1, respectively. In addition, from the z test it is concluded that the null hypothesis H0 is accepted, which means the solution of finite difference method is equal to analytical solution by a confidence level of 95 percent.
Uji Kesesuaian Alat Proteksi Radiasi Berdasarkan Nilai Exposure Index (EI) di Rumah Sakit Bali Mandara Tamba, Chasbas Putra; Sutapa, Gusti Ngurah; Putra, Ketut; Sandi, Nengah; Gede Suharta, I Wayan; Kasmawan, I Gde Antha
Kappa Journal Vol 10 No 1 (2026): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v10i1.31760

Abstract

A study has been conducted on the suitability test of radiation protection equipment based on the Exposure Index (EI) at Bali Mandara Hospital. The data used in this study are primary data obtained by conducting X-ray irradiation on PPE, namely Apron, Gonad Shield, thyroid Shield, gloves, and glasses using an X-ray machine. Then the irradiation results are processed using a CR system machine to obtain EI values using variations in tube voltage of 80 Kv, 100 Kv, 130 Kv, and a time current of 18 mAs. From the results of the analysis that has been carried out, the average EI value was obtained with a tube voltage of 80 kV for Apron 1004.60 ± 1.72, gonad shield 1302.80 ± 1.94, Thyroid shield 1444.60 ± 1.63, glasses 1375.40 ± 1.72, gloves 1478.60 ± 0.93, for a tube voltage of 100 kV the EI value for the apron was 1511.20 ± 1.24, gonad shield 1697.80 ± 1.65, thyroid shield 1810.60 ± 1.57, glasses 1598.60 ± 1.33, gloves 1819.40 ± 0.75, for a tube voltage of 130 kV 1831.00±1.41, gonad shield 2090.60±1.21, thyroid shield 2129.00±2.00, glasses 2980.20±1.07, gloves 2114.00±1.41. The EI value obtained using 80 kV tube voltage is still within the limits set by PERKA BAPETEN No.8 of 2011, namely 1300-1800
Measurement of CT Number Uniformity Value at Various X-ray Tube Current Settings in CT Scanning Ni Nyoman Ratini; Gusti Ngurah Sutapa; Ni Kadek Nova Anggarani; I Gde Antha Kasmawan; Anastasia Jessing Gamalita Mberato
Jurnal Penelitian Pendidikan IPA Vol 11 No 1 (2025): January
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i1.8527

Abstract

Studies on the analysis of variations in CT number uniformity values for CT-Scan images has been conducted. This study aims to evaluate the image quality value by uses various tube currents (mAs) in Siemens merk water phantom irradiation to assess the value of image quality. A Siemens Somatom Scope CT-Scan with current variations of 180 mAs, 200 mAs, 220 mAs, 240 mAs, and 260 mAs was used. The image results were then anlyzed for quality through the CT number uniformity value test. Using a marker size of 12.56 cm2, the ROI method was applied at five different picture points: the center, 3, 6, 9, and 12 o'clock. For each current variation used in this study, 3 irradiation was carried out and 5 image slices were taken from each irradiation.This resulted of the analysis the CT number uniformity value was shown to be significantly reduced by the tube current strength (R2=0.9896, p-value<0.05), according to the research. The test showed that the uniformity CT number value decreased from 0.217 HU to 0.031 HU as the tube current strength was increased, bringing it closer to the reference value (0 HU). The consistency CT number values acquired in this study remain within the 2 HU tolerance limits established by BAPETEN.
Bahasa Inggris Gracia Paula Fahik; Sutapa Gusti Ngurah; I Gusti Agung Widagda; Ni Kadek Nova Anggarani; Made Sumadiyasa; I Gde Antha Kasmawan
Jurnal Penelitian Pendidikan IPA Vol 11 No 6 (2025): June
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i6.10382

Abstract

A study has been conducted on the Effective Dose of Sensitive Organs and the Risk of Cancer in Contrast to Abdominal CT-Scan Examination to determine the effective dose of sensitive organs and the risk of cancer in male and female patients. This study was conducted at Bali Mandara Hospital, and data was used, namely, 60 CT-scans of the Abdomen in contrast to patient examination data. The sensitive organs of concern in this study are the stomach, colon, bladder, and liver. To determine the effective dose value of sensitive organs, the equivalent dose value (????????) is multiplied by the value (W????) in each sensitive organ. From the calculation results obtained, it is known that the highest dose is received by the stomach and colon with a value of 9.90  ± 3.94  mSv for male patients and 8.82  ± 2.27 mSv for female patients. To find out the cancer risk value in each organ for male and female patients is done by multiplying the equivalent dose value (????????) by the value (rt) in each organ in adult patients. From the results obtained, patients with the highest risk of cancer are male patients with the highest risk, namely the colon organ, with a risk of 79,16 ×10-4 %. From the results obtained, an analysis was carried out to compare the cancer risk in male and female patients for each organ using the Independent T-Test. From the results obtained, it was found that there was a difference in cancer risk between the two patients, where male patients have a greater risk of cancer than women, with the highest average difference in cancer risk, namely 0.00086 ± 0.00066% in the colon organ
Co-Authors Adnyana, I Gusti Agung Putra Anandika Putra, I Made Raditya Anastasia Jessing Gamalita Mberato Artawan, I Nengah Artawan, Nengah Baskoro, Winardi Tjahyo Cory Amelia Dali Sinaga, Ade Nisa Daniel Happy Putra Dedy Pratama, I Putu Djoko Hadi Prajitno Efrensiana Ana Melti Gede Suharta, I Wayan Gracia Paula Fahik Gusti Ngurah Sutapa Hadi Apriandi I G. A. Widagda I Gusti Agung Ayu Ratnawati I Gusti Agung Ngurah Ari Kusuma Putra I Ketut Putra I Ketut putra, I Ketut I Made Satriya Wibawa I Made Yuliara I Nengah Artawan I Nengah Sandi I Nengah Sandi I Nengah Simpen I NYOMAN WIJAYA I Putu Wahyu Pranata Kusuma Jaya I Wayan Supardi I. M. Yuliara I. M. Yuliara I.M. Yuliara Ida Ayu Dwi Giriantari Ida Bagus Made Suryatika Ida Bagus Made Suryatika Ida Bagus Putu Priastana Bawa Irhas, Rozi Kelo, Febriyanti Jia Ketut Putra M. Zully Amrul Hadi Made Sumadiyasa Made Suryatika, Ida Bagus Mas Janudinata, Gde Ari Murzid, Jihan Qothrunada N. L. P. Trisnawati Ni Kadek Nova Anggarani Ni Kadek Nova Anggarani Ni Luh Putu Trisnawati Ni Made Wedayani Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Putu Yuni Nurmalasari Nurmalasari, Ni Putu Yuni Nyoman Wendri Pranditayana, I Nyoman Prawistya Putra, I Made Gede Mas Prayuda, I Made Ardi Putra Adnyana, I Gusti Agung Rosvita Hilbrida Sulastri Rozi Irhas Sandi, Nengah Sari, Kamelin Diah Satriya Wibawa, I Made Setiawan, Yohanes Agus Silalahi, Dio Carpry Gunawan Silalahi, Johanes J. Sismanto Spardi, I Wayan Suandayani, Ni Komang Tri Sukarasa, I Ketut Sutapa Gusti Ngurah Tamba, Chasbas Putra Tri Jaya Maghuna, Komang Trisnawati, Ni Luh Putu Umi Hariyani Wayan Balik Sudarsana Wayan Gede Suharta Widagda, I Gusti Agung Widagda, I. G. A Widiana, I Komang Widianingsih, Ni Kadek Indah Winardi Tjahjo Baskoro Winardi Tjahyo Baskoro Windaryoto Windaryoto Winer Johan Bora Yuliara, I Made Yuliara, Made