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All Journal Buletin Udayana Mengabdi Bumi Lestari Jurnal Sains Materi Indonesia Jurnal Neutrino : jurnal fisika dan aplikasinya Journal of Mathematical and Fundamental Sciences Kappa Journal Jurnal Fisika Indonesia BULETIN FISIKA
Ni Nyoman Rupiasih
Department Of Physics, Faculty Of Mathematics And Natural Sciences, University Of Udayana
Agriculture, Biological Sciences & Forestry Humanities Astronomy Chemistry Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Other

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THE EFFICACY OF CHITOSAN FROM WINDU SHRIMP SHELLS AS A PRESERVATIVE OF FRESH KENYAR FISH IN THE FORM OF DARNE DURING STORAGE AT ROOM TEMPERATURE Ni Nyoman Rupiasih; Yosefa Yakunda Tandu; Nyoman Wendri; S. S. Jagtap
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 15, No 1 (2022): October
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v15i1.17094

Abstract

This study is about the efficacy of chitosan from windu shrimp shells (Panaeus monodon) as a preservative for fresh fish in the form of darne (steak), namely fresh kenyar fish (Sarda orientalis) during storage at room temperature. The chitosan solution used are chitosan solution with concentration of 1%, 1.5%, 2%, and 2.5%. The fish samples which soaked in that solutions are named T1, T2, T3, and T4, respectively .. The soaking time were 20, 40 and 60 minutes. As control were fish without treatment (C-0) and fish soaked in acetic acid (C-A). All samples stored at room temperature. The activity of chitosan as fish preservative was analyzed through pH and antimicrobial test. The pH test were made in the range of 0, 24, 48 and 72 h. The antimicrobial test was done on the storage period 24 h. The results showed that the greater the concentration of chitosan solution, the shorter the soaking time required to obtain the benefits of chitosan as an antimicrobial agent for fish preservation, especially kenyar fish in the form of darne. The fish that are still suitable for consumption for 24 hours of storage are fish that are soaked in a 2.5% (T4) chitosan solution at either 20, 40, or 60 minutes of soaking time.
EFFECT OF COLLAGEN CONCENTRATION ON MORPHOLOGY OF PVA/CHITOSAN FIBERS MADE BY ELECTROSPINNING METHOD Ni Nyoman Rupiasih; Dewa Ayu Sukma Pranastia; Made Sumadiyasa; P. B. Vidyasagar
Jurnal Neutrino:Jurnal Fisika dan Aplikasinya Vol 15, No 2 (2023): APRIL
Publisher : Department of Physics, Maulana Malik Ibrahim State Islamic University of Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18860/neu.v15i2.17665

Abstract

The purpose of this study was to determine the impact of the addition of collagen concentration on morphology of PVA/chitosan nanofiber. The research was conducted by making 10% PVA solution, 2% chitosan solution, and collagen solutions with various concentrations of 2%, 4%, and 8%. The PVA/chitosan/collagen nanofibers were made with ratios of 8:2:2, 8:2:4, and 8:2:8 and were named P8/Ch2/C2, P8/Ch2/C4, and P8/Ch2/C8. As a control was PVA/chitosan with a ratio of 8:2, which was named P8/Ch2/C0. The nanofiber was made by electrospinning method with the following parameters: a voltage of 10 kV, a distance from the spinneret tip to the collector of 10 cm, and a flow rate of 1.00 µl/h. Nanofiber characterization was carried out using FTIR and SEM. SEM images were analyzed using ImageJ and Origin to measure the diameter and length of the fibers. It obtained that, the best ratio of PVA/chitosan/collagen to make a good nanofiber is 8:2:2, with the characteristics are the least number of beads and solution droplets, the most continuous fiber, and the average diameter is 145.55±8.64 nm. This result showed that, the addition of collagen can improve the morphology of PVA/chitosan nanofibers, where the characteristics of fibers made depending on the concentration of collagen added.
Optimasi Slice Thickness dengan Nilai Signal to Noise Ratio dan Contrast to Noise Ratio untuk Meningkatkan Kualitas Citra MRI Genu Anastasia Victor, Agnes Maria Salvi; Sutapa, Gusti Ngurah; Gunawan, A. A. Ngurah; Sandi, I Nengah; Rupiasih, Ni Nyoman; Simpen, I Nengah
Kappa Journal Vol 9 No 1 (2025): April
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v9i1.29591

Abstract

Research has been conducted on the effect of slice thickness variation on the quality of Genu MRI images. This study was conducted at the Radiology Installation of Bali Mandara Hospital using primary data from Genu MRI examination results.The independent variable in this study is the variation of slice thickness values of 3, 5, and 7 mm. There were 30 patientsmeasured and the tissues analyzed were ligament, bone, fat, and noise as background using the ROI method and the segmentation results wereresults were taken at the mean value and standard deviation in the background. The difference in SNR and CNR values due to variations in slice thickness values can be tested using the Factorial Anova test. The results of this study obtained that there is an effect of slice thickness variation on SNR and CNR values that will have an impact on the quality of MRI Genu images. The greater the slice thickness value analyzed, the greater the SNR and CNR values produced and the better the image quality. In ligament tissue, the average SNR values of 3, 5 and 7 mm are 23.830; 36.594; and 50.524, respectively. In bone tissue, 191.352; 277.399, and 344.170 were obtained. In fat tissue, SNRs of 9,460, 292,022, and 367,463 were obtained. Changing the slice thickness will directly affect the SNR. It can be seen that the higher the slice thickness value given, the higher the SNR and CNR values for each tissue evaluated and the longer the scanning time required. In the slice thickness variation.
Studi Pola Sebaran Asap Dan Kondisi Parameter Fisis Meteorologi Berbasis Citra Satelit Himawari-8 (Kasus: Kebakaran Hutan di Provinsi Jambi) Sinaga, Gerson; Yuliara, I Made; Rupiasih, Ni Nyoman; Sukarasa, I Ketut; Adnyna, I. G. A. P; Widagda, I. G. A
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.v8i1.23981

Abstract

This research has conducted a study of smoke distribution patterns and conditions of meteorological physical parameters based on Himawari-8 satellite imagery (Case: Forest Fires in Jambi Province). Data analysis was carried out in this study using Himawari-8 satellite image data with processed RGB False Color method in SATAID software. Meteorological factors such as hot spots, rainfall, air temperature, wind direction and speed are parameters that can affect the process of forest fires and smoke distribution. The data collected in this research is secondary data. The meteorological data and smoke images from BMKG Jakarta center, Jakarta, then the data is processed and analyzed so that it can interpret the meteorological conditions and smoke patterns in Jambi Province. The smoke images that have been collected are then processed using a laptop with SATAID Software on channels 3, 4, and 6 so that the color of the smoke and the distribution of brownish forest fire smoke can be seen in the form of images. Based on the results of the research, the state of meteorological physical parameters in Jambi Province shows a state of drought, hot spots totaling 30 locations from June 24 to 28, 2022, and low rainfall is one of the factors that trigger the process of forest fires, air temperature with an average of <25 ℃ is classified as a moderate temperature during forest fires. satellite image data and meteorological condition data in 2022, wind direction and speed below 29 kt (knots) are categorized as moderate wind gusts. 
Web-based Indigenous Village P Web-Based Traditional Village Population Administration System in Jimbaran Village, South Kuta, Badung Mahendra Sastra Adhi Wiguna Gede; Nur Fadhillah Muhamad; Trisanjaya Purba Ghaniel; Aldo Dzar Al-Ghifari; Yudisthira Arimbawa Saputra I Gusti Ngurah Agung; Dionicius Hadarian; I Putu Amara Setia Putra; Patriot Akbar; Taufikur Rohman; Pramuditya Adha Ra&#039;afarudin; I Wayan Supardi; Ni Nyoman Rupiasih; Nyoman Wendri
BULETIN FISIKA Vol. 26 No. 2 (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.i02.p06

Abstract

The population administration in Jimbaran Traditional Village faces challenges of inefficiency and data inconsistency due to manual processes, especially in managing unique data structures such as NPK (Family Registration Number), NIKA (Traditional Community Registration Number), and Dadia. To address these issues, a web-based administrative information system was developed using the Prototyping method with the Laravel framework, MySQL database, and an interface built using Tailwind CSS and Alpine.js. The resulting system features key functionalities such as centralized master data management, dynamic input forms with automatic NPK and NIKA numbering, management of Traditional Family Card membership, and an integrated correspondence service module. The implementation results demonstrate that this application successfully serves as a functional solution for centralizing data, accelerating administrative services, and enhancing the accuracy of population data in accordance with the specific needs of the traditional village.
The Corrosive Properties Analysis of Biodegradable Magnesium Composites Mg-xCAp (x=0, 5%, 10%, and 15%) for Bone Implant Applications Bano, Ana; Rupiasih, Ni Nyoman; Setyadi, Iwan; Wibisono, Mirza; Suryadi, Suryadi; Jujur, I Nyoman
BULETIN FISIKA Vol. 27 No. 1 (2026): 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.2026.v27.i01.p08

Abstract

Magnesium (Mg) is a promising biodegradable material for bone implant applications due to its suitability of mechanical properties and biocompatibility with natural bone. However, its rapid degradation in physiological environments remains a major obstacle in clinical applications. The addition of carbonated apatite (CAp) as a bioactive reinforcing phase is expected to improve the corrosion resistance of Mg-based composites by forming a more stable surface layer. This study aims to evaluate the corrosion properties of Mg–xCAp composites with variations in CAp content of 0%, 5%, 10%, and 15%. Corrosion testing was carried out electrochemically in simulated body fluid (SBF) solutions using the Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS), and Tafel polarization methods. The OCP results showed a potential shift towards a more positive direction up to −1.87 V as the CAp fraction increased, indicating increased electrochemical stability. EIS analysis showed a progressive increase in charge transfer resistance (Rct), with the highest value of 309.8 Ω•cm² in the Mg–15CAp composite, indicating the formation of a more protective surface layer against aggressive ion penetration. Tafel polarization results confirmed a significant decrease in corrosion rate, with Mg–15CAp showing the lowest corrosion rate of 2.03 mm/year. Overall, the addition of CAp proved effective in controlling Mg degradation and improving the corrosion resistance of the composite, thus potentially expanding the application of Mg–CAp as a biodegradable bone implant material.
Co-Authors A. A. N. Surya Mahendra Putra A.A. Ngurah Gunawan Adnyana, I Gusti Agung Putra Adnyna, I. G. A. P Aldo Dzar Al-Ghifari Anastasia Victor, Agnes Maria Salvi Angelia Bella Kusumaningtyas Bano, Ana Decky Danuarta Fernanda Dewa Ayu Sukma Pranastia Dewa Ayu Sukma Pranastia Dewi Handayani Dionicius Hadarian Fahim Mamduh Gunawan, A. A. Ngurah Gusti Ngurah Sutapa Helena Idah Hery Suyanto I B Sujana Manuaba I G. A. Widagda I Gde Antha Kasmawan I Gusti Agung Ayu Ratnawati I Ketut Putra I Made Hendra Hadinata I Made Oka Guna Antara I Nengah Sandi I Nengah Sandi I Nengah Simpen I Nyoman Jujur I Putu Amara Setia Putra I Wayan Supardi I Wayan Supardi I. W. Sumarjaya I.B.S. Manuaba I.W. Sumarjaya Ida Ayu Putu Inten Gayatri Ida Bagus Alit Paramarta Ida Bagus Made Suryatika Ida Wisnu Sari Iwan Setyadi James Sibarani K N Suarbawa Komang Dharmawan Laura Laudensia Senly Jalut M. Joni Made Sumadiyasa Mahendra Sastra Adhi Wiguna Gede Maria Yulni Imas Maulida Nirwana Islami Ni Kadek Gita Hari Yanti Ni Kadek Gita Hari Yanti Ni Luh Yuni Pramita Utami Ni Made Rasmini Ni Nyoman Putri Windari Ni Wayan Eri Sandriani Ni Wayan Eri Sandriani Nur Fadhillah Muhamad Nyoman Wendri Nyoman Wendri Nyoman Wndri P. B. Vidyasagar P. Suardana Patriot Akbar Pramuditya Adha Ra&#039;afarudin Pt Widyatmika Putu Erika Winasri Putu Ika Paramitha Putri R.A Restia Pranagari Ratih Wulandari Ria Yuliani Rosvita Hilbrida Sulastri S. S. Jagtap Septiana Ribka Purnomo Sinaga, Gerson Sukarasa, I Ketut Suryadi Suryadi Taufikur Rohman Trisanjaya Purba Ghaniel Umi Hariyani Wibisono, Mirza Widagda, I. G. A Wolfharditia Oktaviana Nita Yan Ramona Yohanes Sardjono Yosefa Yakunda Tandu Yudisthira Arimbawa Saputra I Gusti Ngurah Agung Yuliara, I Made Zoucella Andre Afani