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Sukarasa, I Ketut
Udayana University
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PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION I Gusti Agung Putra Adnyana; Komang Ngurah Suarbawa; I Ketut Sukarasa
Jurnal Sains Materi Indonesia Vol 11, No 1: OKTOBER 2009
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.47 KB) | DOI: 10.17146/jsmi.2009.11.1.4560

Abstract

PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION. Telah dilakukan studi pengaruh ketebalan lapisan penyangga Galium Nitrida, GaN terhadap struktur kristal dan sifat optik film tipis GaN yang ditumbuhkan dengan metode Pulsed Laser Deposition (PLD). Lapisan penyangga ditumbuhkan pada suhu 450ºC dan laju aliran nitrogen 100 sccm dengan waktu deposisi divariasikan antara 15 menit sampai 45 menit. Film yang diperoleh dikarakterisasi dengan Profilometer DEKTAK IIA, Difraktometer sinar-X dan Spektroskopi UV-Vis. Ketebalan lapisan penyangga berpengaruhterhadap kualitas kristal dan sifat optik film tipis GaN yang ditumbuhkan di atasnya. Dari hasil analisis pola difraksi sinar-X dan spektrum UV-Vis, diketahui bahwa film tipis GaN yang ditumbuhkan di atas lapisan penyangga dengan ketebalan 184,6Å cenderungmemiliki orientasi tunggal (0002) yang lebih baik dengan Full Width at Half-Maximum (FWHM) 0,9º dan energi celah pita (Eg) = 3,4 eV dibanding film tipis GaN dengan ketebalan lapisan penyangga 370,2 Å dan 560 Å.
ANALISA TINGKAT RISIKO BENCANA GEMPA BUMI DI WILAYAH BALI Rudy Darsono; I Ketut Sukarasa; Yohanes Agus Setiawan
BULETIN FISIKA Vol 17 No 1 (2016): 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

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Abstract

Bali region is prone to earthquake disasters because it lies between the two zones that cause earthquake (back arc trust at the north and subduction zones at the south) and also vulnerable to earthquake disasters because of high population density. These conditions threaten the safety of lives and property of the population, so it needs to be research to analyze the risk of earthquake disaster in Bali. For identification of earthquake disaster risk, in this study using 3 factor: earthquake danger factor is Peak Ground Acceleration in Bali, vulnerability factor is population density every district in Bali, and resilience factors is HDI (Human Development Index) every district in Bali. PGA value calculation using the atenuation function of Fukushima and Tanaka, for disaster risk index calculation using AHP (Analytical Hierarchy Process). The conclusion, regions that obtained the highest level of earthquake disaster risk are Karangasem and northern Buleleng, while the lowest are southern part of Badung, northern part of Gianyar and Nusa Penida.
PENGARUH INDIAN OCEAN DIPOLE MODE (IODM) TERHADAP INTENSITAS HUJAN DI BENUA MARITIM INDONESIA (BMI) BARAT I Made Kertayasa; I Ketut Sukarasa; IGA Widagda; I Gede Hendrawan
BULETIN FISIKA Vol 14 No 1 (2013): 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

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Abstract

The relation of IODM with rainfall intensity of west BMI have been investigated with Fourier transform and Wavelet transform. IODM can be identified with Dipole Mode Index (DMI). This experiment used Sea Surface Temperature (SST) data from satellite Moderate Resolution Imaging Spectroradiometer (MODIS) and rainfall intensity data from satellite Tropical Rainfall Measuring Mission (TRMM). The result of Fourier transform show that the maximum period of DMI (53,5 months) and maximum period of rainfall intensity of west BMI (12 months). From that result the data is filtered 12 months and obtained correlation -0.83, that correlation mean DMI and rainfall intensity of west BMI have strong negative correlation. The result of Wavelet transform are power spectrum of DMI and rainfall intensity of west BMI. That power spectrums have been correlated, and got positive significant power spectrum correlation at period 1.5 – 1.7 year, 2.4 – 2.8 year, and 3.2 – 4.2 year and negative significant power spectrum correlation at period 3 year and 4.2 – 4.4 year.
PENGARUH FREKUENSI SIKLON TROPIS TERHADAP CURAH HUJAN DI TIMOR-LESTE Fernandes Flaviana Pinto; I Ketut Sukarasa; I Gede Hendrawan
BULETIN FISIKA Vol 16 No 1 (2015): 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

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Abstract

This study aims to determine the impact of tropical cyclone frequency to the rainfall in Timor-Leste using monthly data for 30 years. The rainfall data obtained from tropical rainfall Measuring Mission (TRMM) satellite and Global Precipitation Climatology Centre (GPCC). Daily rainfall In Situ data obtained from Direcção Nacional de Meteorologia e Geofisica (DNMG). Japan Aerospace Exploration Agency (JAXA) and Bureau of Meteorology Australia (BOM) provided for tropical cyclone data. The impact of tropical cyclone to the rainfall can be observed from the seasonal pattern of DJF, MAM, JJA and SON. The highest and the lowest correlation seasonal pattern of MAM and DJF are about r = 0.99 and r = -0.97, respectively. Correlation in the seasonal pattern of JJA and SON are about r = 0.0, it because no cyclone in this season. If we observed the daily condition between tropical cyclone frequency to rainfall, the highest correlation occurred in March 2004 and April 2011 with the resulting correlation are about r = 0.73 and r = 0.79, respectively. This is an overall correlation a week before, after and during cyclone. For along 30 years, we found the correlation in 2000 and 2006 is about r = 0.41. So that, the value of correlation coefficient obtained from 1983 to 2012 is about r = 0.19, there is not a significant impact to the rainfall when tropical cyclone doesn’t occur in Timor-Leste.Keywords: Tropical Cyclone Frequency, Rainfall, Anomaly, Correlation
ANALISA TINGKAT BAHAYA DAN KERENTANAN BENCANA GEMPA BUMI DI WILAYAH NUSA TENGGARA TIMUR (NTT) Ni Made Rysnawati; I Ketut Sukarasa; Ida Bagus Alit Paramarta
BULETIN FISIKA Vol 18 No 1 (2017): 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

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Abstract

East Nusa Tenggara is a region in Indonesia which included in the category of hazard prone to earthquakes, because it is flanked by two earthquakes zones, (subduction zone at the south and back arc trust in the north). It is also vulnerable to earthquake disasters because of high population density. These conditions would threaten the safety of lives and property of the population, so it needs to be research to analyze the level of earthquake hazard and vulnerability in East Nusa Tenggara. For identification of the level of hazard and the vulnerability of the earthquake in this study using two factors: the danger factor with indicator Peak Ground Acceleration, vulnerability factors with indicators of population density districts in East Nusa Tenggara. The calculation of the value of PGA use attenuation function of Fukushima and Tanaka. From the calculation of the data obtained that has a very high earthquake hazard is in Ende and Alor district, while the district has a very high risk of vulnerability is in Sikka, Sumba Barat Daya and Sabu Raijua.
Analisis Sebaran Debu Vulkanik Erupsi Gunung Agung 2018 dan Pengaruhnya Terhadap Suhu Permukaan Darat Wilayah Bali Dengan Menggunakan Metode Split Windows Septian Jonathan; I Ketut Sukarasa; I Wayan Wirata
BULETIN FISIKA Vol 22 No 2 (2021): 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.2021.v22.i02.p09

Abstract

Sebaran awan debu vulkanik erupsi Gunung Agung 2018 dapat diketahui dengan pengolahan data komposisi RGB menggunakan metode split windows pada aplikasi SATAID, yang dapat membedakan awan debu vulkanik atau awan meteorologi (awan air/es), dan juga dapat mengetahui arah angin yang terjadi pada saat kejadian. Data komposisi RGB diperoleh dari satelit cuaca Himawari-8 melalui kanal IR (10,4 µm), kanal I2 (12,4 µm) dan kanal I4 (3,9 µm) yang mampu mengidentifikasi keberadaan awan debu vulkanik. Kata kunci: Gunung Agung, Himawari-8, Erupsi, Split Windows, RGB.
Identifikasi Deformasi Pulau Bali Berdasarkan Rekaman Data GPS, Menggunakan Software GAMIT/GLOBK 10.6 Komang Ngurah Suarbawa; I Ketut Sukarasa; Elvin Riyono
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.p07

Abstract

Research on the tectonic activity of the island of Bali has been carried out which aims to identify and determine the direction of the deformation movement of the island of Bali. The research was conducted using local GPS data recorded at eleven observation points on the island of Bali. Data processing was carried out using GAMIT / GLOBK 10.6 SOFTWARE and several supporting software such as teqc to test the quality of GPS and GMT recording data to plot the processed data. The results showed that there was a shift in the observation point which indicates tectonic activity on the island of Bali. The point shift pattern shows a shift that tends to be east to southeast. The deformation pattern is thought to have occurred due to tectonic plate activity in the eastern and southern parts of the island of Bali.
Validation of Daily Rainfall Based on Global Satellite Mapping of Precipitation (GSMAP) Data of Bali and Nusa Tenggara Region Sanjaya Natadiredja; I Ketut Sukarasa; Gusti Ngurah Sutapa
BULETIN FISIKA Vol 19 No 1 (2018): 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

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Abstract

Limitations of observation data cause analysis and prediction of precipitation is difficult. One way to overcome such limitations is the use of satellite data such as GSMaP, but satellite data needs to be validated before use. This study aims to validate GSMaP rainfall data on observation data in Bali and Nusa Tenggara. Through monthly time series analysis, GSMaP rainfall data tend to have smaller value than observation data, but it has similar data pattern in each region with rain pattern that occurs in November to March (NDJFM). While validation between GSMaP satellite rainfall data and observation using Pearson and RMSE correlation and MBE at each location showed strong positive correlation value (> 0.5), correlation value obtained from each location from 0.82 to 0.93 with RMSE value from 2.08 to 5.51 and MBE values ??from 0.23 to 0.89, this indicates that GSMaP satellite data is valid and can be used to fill in empty data especially in 5 observation areas ie Denpasar, Ampenan, Sumbawa Besar, Bima and Kupang.
Pemodelan 3D Struktur Bawah Permukaan Gunung Anak Ranakah dan Sekitarnya Menggunakan Metode Gravitasi Desiderius Jarut; I Ketut Sukarasa; Ida Bagus Alit Paramarta
BULETIN FISIKA Vol 23 No 1 (2022): 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.2022.v23.i01.p09

Abstract

Research has been carried out on 3D modeling of the subsurface structure of Mount Anak Ranakah and its surroundings. This study aims to create a map and determine the value of the complete bouguer anomaly, regional anomaly, residual anomaly, subsurface density value and create a 3D model of the subsurface structure. The data used is secondary data, namely satellite gravity anomaly data obtained from the Topex website. Data processing in this study using the gravity method. In this method, gravity correction will be carried out, making a complete bouguer anomaly map, performing spectrum analysis, separating regional and residual anomalies using a butterworth filter and performing inverse modeling using ZondGM3D software to create a 3D model of subsurface structures. The results of the complete Bouguer anomaly map show the anomalous value of the study area between 134.6-209.3 mGal, regional anomaly 147.4-205.9 mGal and residual anomaly between (-12.8)-11.0 mGal. The inverse modeling results show that the subsurface geological structure of Mount Anak Ranakah and its surroundings has a density range between 1.2-3.0 g/cm3, so that from the range of rock density values ??it can be estimated that the subsurface geological structure of Anak Ranakah and its surroundings consists of soil rock (1.2-2.3 g/cm3) andesite 2.40-2.80 g/cm3) and basalt (2.70-3.0 g/cm3).
Validasi Curah Hujan Harian Berdasarkan Data Global Satellite Mapping Of Precipitation (Gsmap) dengan Data Observasi di Wilayah Bali I Gusti Agung Made Duwanda; I Ketut Sukarasa
BULETIN FISIKA Vol 23 No 2 (2022): 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.2022.v23.i02.p05

Abstract

Research has been done on the validation of rainfall based on Global Satellite Mapping of Precipitation GSMaP data with observation data in the Bali area. The method used in this research is Pearson correlation, root mean square error (RMSE), and mean square error (MBE). This study aims to validate GSMaP rainfall data with observations in the Bali area. In general, GSMaP rainfall data tends to have a smaller value than observation data, but has almost the same data pattern in each area with rainfall patterns that occur from November to March. The study shows a strong positive correlation value (> 0.5), where in the Ngurah Rai area the value of = 0.889 with =0.558 and = 0.061, in Negara the value of = 0.887 with = 0.595 and = 0.049, and in Denpasar area the value of = 0.879 dengan = 0.444 dan = 0.058. This shows that GSMaP satellite data is quite valid and can be used especially in 3 observation areas, namely Ngurah Rai, Negara, and Denpasar.
Co-Authors Aditya, I Putu Sukma Nanda Adnyana, I Gusti Agung Putra Alfha Abrianto L. Tobing Ardhianto Septiadhi Bayu Baskara Desiderius Jarut Elvin Riyono Fernandes Flaviana Pinto Gusti Ngurah Sutapa Heppy Febrian Abdi Bintari Husnul Hatimah Husnul Hatimah, Husnul I G. A. Widagda I Gede Hendrawan I Gusti Agung Made Duwanda I Ketut Putra I Made Dwi Wiratmaja I Made Kertayasa I Made Kris Adi Astra I Putu Dedy Pratama I Putu Sukma Nanda Aditya I Wayan Andi Yuda I Wayan Wirata Ida Bagus Alit Paramarta Ida Bagus Alit Paramartha Ita Purnamaimun Kadek Sumaja Komang Ngurah Suarbawa Lintang Ardhana Reswari Made Prama Yudistira Mahmud Yusuf Mahmud Yusuf Muhamad Abdul Ghofur Ni Kadek Sugestiani Ni Luh Gede Desy Suryaningsih Ni Made Rysnawati Ni Wayan Meri Monika Sari Oktaviana Nurhayati Murni Purnamaimun, Ita Rakhmat Prasetia Romadhon Ilham Imani Rudy Darsono Rudy Darsono Sanjaya Natadiredja Septian Jonathan Tobing, Alfha Abrianto L. Wayan Mita Restitiasih Wisnu Ari Adi Wisnu Ari Adi Yohanes Agus Setiawan