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Ni Nyoman, Ratini
Program Studi Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Udayana
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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Pengaruh Variasi Tegangan Tabung Sinar-X terhadap Signal to Noise Ratio (SNR) dengan Penerapan Anode Heel Effect menggunakan Stepwedge Puja Satwika Luh Gede; Ni Nyoman Ratini; Maghfirotul Iffah
BULETIN FISIKA Vol 22 No 1 (2021): BULETIN FISIKA February Edition
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.2021.v22.i01.p04

Abstract

It has been conducted research to determine the effect of X-ray tube voltage variation (kV) on Signal to Noise Ratio (SNR) values by applying the Anode Heel Effect using stepwedge with the addition of 1.5 mm thickness each step. The stepwedge used was 1.5-31.5 mm. The X-ray tube voltage variations used were 40, 50, 60, 70, 80, and 90 kV. Analysis of the effect of X-ray tube voltage variation on SNR values is determined using IMB SPSS Statistics 26 with a simple regression test. The test results showed that variations in X-ray tube voltage affect SNR values, where the greater the variation in X-ray tube voltage then the SNR value would get smaller. The optimal SNR value of 72.685 was obtained at a tube tension of 40 kV and a stepwedge thickness of 27.0 mm.
SISTEM INFORMASI VISUAL PENENTUAN WAKTU PENYINARAN HARIAN KANKER UNTUK TEKNIK S.A.D. Putu Wida Gunawan; A.A Ngurah Gunawan; Ni Nyoman Ratini
Jurnal Teknologi Informasi dan Komputer Vol 1, No 1 (2015): Jurnal Teknologi Informasi dan Komputer
Publisher : LPPM Universitas Dhyana Pura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (189.07 KB)

Abstract

Sistem informasi komputer visual   untuk menghitung waktu penyinaran harian kanker dengan teknik source to axis distance telah diciptakan.   Data pasien dapat disimpan dalam sistem ini sehingga proses perhitungan dapat dipermudah dan dipercepat.   Hasil perhitungan yang didapat juga mendekati darihasil manual yang dilakukan di Rumah Sakit Sanglah Sub Divisi Radioterapi dengan selisih 0,033 hingga 0,334 detik untuk teknik S.A.D., dan 0,01 hingga 0,61 detik untuk teknik S.S.D.Kata kunci : Waktu penyinaran harian kanker, S.A.D., S.S.D.
PENGENALAN TEKNOLOGI PENGERINGAN CABAI UNTUK KELOMPOK TANI DI SEKARTAJI TABANAN I.G.A. Kasmawan; G. N. Sutapa; I. M. Yuliara; N. N. Ratini; W. T. Baskoro; N. L. P. Trisnawati
Buletin Udayana Mengabdi Vol 20 No 3 (2021): Buletin Udayana Mengabdi
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.045 KB) | DOI: 10.24843/BUM.2021.v20.i03.p03

Abstract

Harga cabai yang turun saat panen melimpah tentu sangat merugikan petani. Hal tersebut perlu segera ditangani dengan cara memperlama masa simpan cabai menggunakan tekonologi tepat guna melalui program pengabdian kepada mayarakat. Tujuan program tersebut adalah memperkenalkan teknik pengeringan cabai menggunakan alat pengering cabai. Metode pelaksanaan pengabdian menggunakan metode ceramah interaksif dan praktek tentang teknologi pengolahan produk cabai mentah hingga menjadi cabai kering menggunakan alat pengering cabai. Hasil yang diperoleh adalah terciptanya alat pengering cabai sederhana berbahan bakar gas. Alat tersebut dibangun menggunakan kombinasi bahan logam (90%) dan kayu (10%) berukuran 80 x 50 x 120 cm3, dengan daya tampung hingga ± 7 kg cabai rawit mentah. Cabai rawit merah dan cabai rawit hijau mengalami penyusutan berat masing-masing sekitar 80% dan 90% dengan warna produk sangat kontas. Proses pengeringan dengan alat pengering lebih cepat (6 jam) dibandingkan dengan cara konvensional (7-10 hari). Berdasarkan hasil kuisioner, tingkat keberhasilan pelaksanaan program pengabdian tersebut di atas 90%.
Analisis Electron Beam Output Constancy pada Pesawat Linear Accelelator (LINAC) Elekta Precise di Instalasi Radioterapi RSUP Sanglah Denpasar Made Aditya Jaya Mahardika; Ni Nyoman Ratini; I Wayan Balik Sudarsana; Fitriyani Mus Mulyadi
Kappa Journal Vol 6 No 2 (2022): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v6i2.6325

Abstract

An analysis of the electron beam output constancy has been conducted on the Elekta Precise Linear Accelerator (LINAC) aircraft at the Radiotherapy Installation at Sanglah Hospital, Denpasar. The energy variations used are 8 MeV and 10 MeV. The analysis of the electron beam output constancy is determined by the standard deviation value obtained. The results of this study were obtained at an energy of 8 MeV with a large deviation value of 0.083% - 1.041%, and an energy of 10 MeV with a large deviation value of 0.022% - 0.695%. Based on the calculation results that the deviation value is still below the tolerance limit set by the AAPM. So that the LINAC Elekta Precise aircraft at the Radiotherapy Installation at Sanglah Hospital Denpasar is suitable to operate to receive patients. 
Perancangan dan Pembuatan Sistem Kontrol Penyiraman Tanaman Hidroponik Otomatis Menggunakan Sensor TDS Berbasis Mikrokontroler ATMEGA328 Feriandanu Hakim; I Wayan Supardi; Ni Nyoman Ratini
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
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.2024.V25.i01.p01

Abstract

In this research, an automatic hydroponic watering system has been designed and made using a total dissolved solid (TDS) sensor based on the ATmega328 microcontroller. The microcontroller contained in the Arduino Uno module functions as a design regulator. This research aims to assist in providing nutrition automatically so that it can help human work. The calibration results show that the tool designed has a good level of accuracy with the accuracy of the tool being 99.99%. These results show that the tool made can be used and runs well.
Analisis Dosis Keluaran Berkas Sinar-X Pesawat Linac Varian Clinac CX Berdasarkan Protokol Dosimetri IAEA TRS 398 Komang Sugiarta; Ni Nyoman Ratini; Hery Suyanto; Syarifuddin Syarifuddin
Kappa Journal Vol 6 No 2 (2022): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v6i2.6327

Abstract

Research has been conducted on the Analysis of the X-ray beam output of the Linac varian Clinac CX based on the TRS 398 IAEA. This analysis aims to determine the condition of Linac in Bali Mandara Hospital with reference to the value of 1 cGy equal to 1 MU obtained from the analysis of the ionization chamber, temperature, pressure, polarity effect and ion recombination. The research was conducted with variations of X-ray energy 6 MV and 10 MV. The size of the irradiation field used is (10 x 10) cm with a Source to Surface Distance (SSD) of 100 cm. Based on the results of absolute measurements of the output dose of the Linac Varian Clinac CX X-ray beam at the Radiation Oncology Sub-Installation of the Bali Mandara Hospital with two variations of energy used, the output dose value at 6 MV energy is 1,00138 ???/?? and at 10 MV energy 0,99456 ???/?? with a large deviation of 0,138 % and 0,544 %, respectively, with the obtained deviation meeting the TRS 398 IAEA tolerance limit of ± 3%.
Pengaruh Luas Bidang Penyinaran dan Delay Time Processing Terhadap Exposure dan Deviation Index Computed Radiography AGFA Seri CR10-X I Gede Erix Krisna Adi Pramartha; Ni Nyoman Ratini; Putu Irma Wulandari
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
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.2023.V24.i02.p02

Abstract

Abstract – Research has been carried out to determine the effect of irradiation area and delay time processing on the exposure index (EI) and deviation index (DI) of computer radiography (CR). The tools used are phantom skull, imaging plate (IP), grid, and CR. The exposure factor used is set constant. To find out the EI value, exposure was carried out with the following variations of the irradiation area, 25 cm x 25 cm, 25 cm x 28 cm, 28 cm x 30 cm, 30 cm x 36 cm and 30 cm x 43 cm. Then the exposure was carried out using a constant irradiation area of ??25 cm x 25 cm, but the delay time processing variations were carried out as follows, 5, 10, 15, 20, 25 minutes. The EI value is used to find the DI value. Next, a graph is made and a test is carried out in the form of a regression test to determine the relation between the area of ??irradiation on EI and delay time processing on EI. Path analysis was also carried out to determine the relation between the area of ??irradiation to DI and delay time processing to DI. The results of the regression test showed that the irradiation area and delay time processing had a significant effect on EI. The results of the path analysis test show that the area of ??irradiation has no significant effect on DI, while delay time processing and EI have a significant effect on DI. Key words: Exposure index, deviation index, delay time processing, irradiation area, computed radiography
Rancang Bangun Alat Pendeteksi Detak Jantung Dengan Metode Photopletysmograph Berbasis Mikrokontroler ATMega328 Pandu Lukito; I Wayan Supardi; Ni Nyoman Ratini
BULETIN FISIKA Vol 24 No 2 (2023): BULETIN FISIKA August Edition
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.2023.V24.i02.p10

Abstract

The heart is one of the human organs who has important role to pumping the blood. Heart rate monitoring needs to do for knowing person's heart health any time. In this research, a heart rate detector using the photopletysmograph method based on the ATMega328 microcontroller has been successfully made using reflection mode. The design of this tool uses a photodiode sensor as a light receiver from infrared LEDs. The measurement results are processed using Arduino uno and displayed on the LCD. The reference tool used to calibrate this heart rate detector is the LK-87 pulse oximeter. The test results show that the tool is feasible to use with an accuracy level of 98.32% and an average error of 1.60%.
Analisis Tingkat Perubahan Vegetasi Hutan Mangrove Terhadap Tingkat Salinitas Menggunakan Citra Landsat Ramadhan, Rafly Rizqyta; Baskoro, Winardi Tjahyo; Sumaja, Kadek; Suarbawa, Komang Ngurah; Indrayana, Putu Tedy; Ratini, Ni Nyoman
Kappa Journal Vol 8 No 2 (2024): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i2.23729

Abstract

Research on the analysis of the level of changes of mangrove forest vegetation on the level of seawater salinity has been conducted with remote sensing methods by using Landsat 8 imagery in Tahura Ngurah Rai. The data used in this research is secondary data from the official website of the USGS (United States Geological Survey). This study aims to determine the levels of changes in mangrove forest vegetation cover in Tahura Ngurah Rai and to determine how much influence the level of mangrove forest vegetation cover has on the level of salinity in Tahura Ngurah Rai. The vegetation values were obtained by processing the NDVI index data and the salinity values were obtained by processing the SI, NDSI and VSSI index. from the results of the analysis that has been conducted, vegetation cover greatly influences the NDSI index with an increase in the total NDVI value of 25,48% and a decrease in the total NDSI value of -25,48%, with a correlation coefficient and determination of NDVI-NDSI 0.998 and 0.996 respectively.
Analisis Laju Dosis Radiasi di Area Ruang CT_Scan di Instalasi Radiologi RSU Bali Mandara Prameswari, Else Putri Ayu; Sutapa, Gusti Ngurah; Ayu Ratnawati, I Gusti Agung; Ratini, Ni Nyoman; Artawan, I Nengah; Trisnawati, Ni Luh Putu
Kappa Journal Vol 8 No 2 (2024): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i2.25211

Abstract

Research has been carried out on radiation dose rate analysis in the CT-SCAN area of the radiology room at RSU Mandara Bali. The data used in this research is quantitative data observed from the radiation rate from the CT-SCAN aircraft. This study aims to determine the radiation dose rate in the radiology area and its rationalization based on regulations regarding radiation NBD (dose limit values) that apply to occupational safety and health. The research data is the actual radiation dose rate determined from the dose rate and calibration factors. The results of data calculations show that the highest dose rates are respectively at T2, 30 cm, 50 cm and 100 cm (door) with values of 1.95, 0.94 and 0.05 μSv/year, while the lowest dose rates are respectively at T4, 30 cm, 50 cm and 100 cm (waiting room) with values of 0.08, 0.06 and 0.05 μSv/year. The research results show that the dose rate at each measurement point is still considered safe for radiation workers where the NBD received is still below 20 μSv/year, while the dose rate is classified as safe for the general public at measuring distances of 50 cm and 100 cm, where the NBD received is below 1 μSv/year assuming the community concerned acts as a patient or patient's family with an interest in the radiology room area.
Co-Authors A. A. Ngurah Gunawan Alit Paramarta, Ida Bagus Anandika Putra, I Made Raditya Artawan, I Nengah Ayu Ratnawati, I Gusti Agung Balik Sudarsana, I Wayan Baskoro, Winardi Tjahyo Br Barus, Ema Vinesia Buana, Muhammad Candra Feriandanu Hakim Fitriyani Mus Mulyadi Girsang, Dhea Vonisa Grace Christine Djara Gusti Ngurah Sutapa Hanzani, Asril Hendrata Wibisana Hery Suyanto I Gde Antha Kasmawan I Gede Erix Krisna Adi Pramartha I Gusti Agung Ayu Ratnawati I Gusti Agung Ayu Ratnawati I Ketut Putra I Ketut putra, I Ketut I M. S. Wibawa I Made Yuliara I Made Yuliara I Nengah Sandi I Putu Eka Juliantara I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Balik Sudarsana I Wayan Supardi I Wayan Supardi I. M. Yuliara I. M. Yuliara Ida Bagus Made Suryatika Ida Bagus Made Suryatika Ida Bagus Putu Priastana Bawa Indrayana, Putu Tedy Irhas, Rozi Jaya, I Putu Wesa Angga Kasmawan, I. G. Antha Keintjem, Regina Gabriel Komang Ngurah Suarbawa Komang Sugiarta Made Aditya Jaya Mahardika Maghfirotul Iffah Marcellino, Nathaniel Mberato, Anastasia Jessing Gamalita Mberato, Anastasya Jessning Gamalita Mberato N. L. P. Trisnawati Nabilla Fatimah Ni Kadek Nova Anggarani Ni Kadek Nova Anggarani Ni Komang Tri Suandayani Ni Luh Putu Trisnawati Ni Putu Aprillia Artanti Phalosa Ni Putu Winiayu Veramika Ni Wayan Mega Savira Utami Nurmalasari Nurmalasari Nyoman Wendri pandu lukito Paramarta, I. B. Alit Pingki Setyowati Dewi Prameswari, Else Putri Ayu Pramitha, Ni Luh Emy Puja Satwika Luh Gede Putu Irma Wulandari Putu Wida Gunawan Ramadhan, Rafly Rizqyta Rozi Irhas Satriya Wibawa, I Made Selvi Marcellia Sismanto Siti Raudatul Jannah Suandayani, Ni Komang Tri Sudarsana, Wayan Balik Sumaja, Kadek Syarifuddin Syarifuddin Trisnawati, Ni Luh Putu Wahyulianti Wahyulianti Wayan Balik Sudarsana Winardi Tjahyo Baskoro Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto Windarjoto, Windarjoto Windaryoto, Windaryoto Wiwik Kurniawati Yuli Nurfadhillah Yuliara, I Made