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All Journal Jurnal Sains Materi Indonesia BULETIN FISIKA International Journal of Physical Sciences and Engineering (IJPSE) Kappa Journal

Komang Ngurah Suarbawa

Program Studi Fisika, FMIPA, Universitas Udayana, Kampus Bukit Jimbaran, Badung, Bali, Indonesia, 80361

Author-ID : 386539

Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Physics Other

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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

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.

Analisis Energi Potensial Gempabumi pada Zona Subduksi Wilayah Bali Ni Putu Juliyant Ananda Rika Pangastuti; Komang Ngurah Suarbawa; I Ketut Putra; Ni Luh Desi Purnami
BULETIN FISIKA Vol 23 No 2 (2022): 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.2022.v23.i02.p09

Research has been carried out to analyze the potential energy of earthquakes in the subduction zone in the Bali region which aims to determine the seismicity index, a-value, b-value, return period and earthquake potential energy in the Bali region at coordinates 114.2º east longitude - 115.9º east longitude and 11 ,7º south latitude – 7.5º south latitude. Earthquake data used in the form of the date and time of the earthquake, earthquake coordinates in the form of latitude and longitude, earthquake depth and magnitude. The research was conducted using secondary data from the USGS (United State Geological Survey) earthquake catalog from 1970 to 2020 with a magnitude of 3-10. The data is modeled using Arc Gis software to obtain a seismicity map. The seismicity index, a-value, b-value, return period and earthquake potential energy were obtained using the least square method. Obtained a-value = 5.3 and b-value = -0.74, a seismicity index of 0.083 and an earthquake return period with a tested magnitude of M0 of 6 Mb of 12 years. The earthquake potential energy for this subduction zone is also obtained at 3,616×1014 J.

Utilizing turbine ventilator as supplier of electrical energy resources for home information Supardi, I Wayan; Suarbawa, Komang Ngurah; Wibawa, I Made Satriya; Padmika, Made; Mahayani, Ni Wayan Dewi; Saputra, I Wayan Wisnawa
International journal of physical sciences and engineering Vol. 2 No. 2: August 2018
Publisher : Universidad Tecnica de Manabi

The power plant has been created with turbine ventilator as a source of electrical energy for lighting. Voltage generator generated when wind speed between 0 m/s up to 6 m/s with no given load is between 0 volts up to 8.38 volts. Generator-generated electricity can be utilized in everyday life after going through several processes like converting the voltage from DC to AC by using a DC to AC inverter and increasing the AC voltage to a 220-volt voltage using a transformer. In this study using 5 watts LED lamp that can be used to help to light.

The effect of lanthanum substitution on the coercivity field in oxide permanent magnet based on Ba1-xLaxFe12O19: (x = 0; 0.02; 0.04; and 0.08) Adnyana, I Gusti Agung Putra; Suarbawa, Komang Ngurah; Adi, Wisnu Ari; Wardani, Ni Nyoman Susi Kesuma; Jalut, Laura Laudensia Senly
International journal of physical sciences and engineering Vol. 3 No. 1: April 2019
Publisher : Universidad Tecnica de Manabi

Synthesis and characterization of Ba1-xLaxFe12O19 based permanent magnet samples with variations in composition (x = 0; 0.02; 0.04; and 0.08) has been done. The method used is a solid state reaction. The phase formation of the sample Ba1-xLaxFe12O19 was carried out at 1200oC for 2 hours. The results of the X-ray diffraction pattern analysis show that all sample compositions have a single phase BaFe12O19. The results of magnetic properties testing using VSM showed that the best coercivity field and remanent magnetization values were obtained at the composition of x = 0.04. The effect of substitution of lanthanum into the barium atom can increase the number of magnetic domains which are indicated by the increase in the coercivity value of the material along with the increasing composition of x. It was concluded that the composition of Ba1-xLaxFe12O19 is a permanent magnet with the best product energy.

Penentuan Jenis Sesar pada Gempabumi Lombok Tanggal 1 Juli sampai 31 Desember 2018 Menggunakan Metode Mekanisme Fokus Ni Nyoman Susi Kesuma Wardani; Komang Ngurah Suarbawa; Ridwan Kusnandar
BULETIN FISIKA Vol 22 No 2 (2021): 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.2021.v22.i02.p06

Research has been conducted on determining the type of fault in Lombok earthquake on July 1 to December 31 2018 using the focal mechanism method. The focal mechanism is a method of reviewing fault parameters that include strike, dip and rake based on the initial movement direction of P wave recorded by the station, which then projected into a focal ball. There are 246 stations are used in several countries. There were 139 earthquakes with M?4.0 on July 1 to December 31 2018, at coordinates 7.0? S-9.0? S and 115.5? E-117.5? E. The result of fault field parameters is at nodal 1 strike=52?-149?, dip=6?-75?, rake=39?-143? and at nodal 2, strike=233?-313?, dip=18?-84?, rake=58?-119?, then projected into focus ball. Based on these results shows that earthquakes occur as a result of thrust fault movement.

Effect of Tropical Cyclones on High Waves in the Southern Regions of Java, Bali, and Nusa Tenggara (Case Study of Tropical Cyclones Claudia) Kholidatul Islamiyah; Komang Ngurah Suarbawa; Kadek Sumaja
BULETIN FISIKA Vol 24 No 1 (2023): 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.2023.v24.i01.p08

Geographically, Indonesia is located in areas below latitude 20° (both north and south) and has little chance for tropical cyclones to grow. Tropical cyclones are storms with great strength that can affect the atmosphere and water conditions in the territory of Indonesia. This study aims to analyze the characteristics of tropical cyclone Claudia and the effect of the cyclone on sea wave conditions in the southern regions of Java, Bali and Nusa Tenggara. The analysis carried out includes data from the Himawari-8 satellite IR channel used to monitor the intensity of wind speed and air pressure at the center of the cyclone using the Dvorak T-number technique. Sea wave data to describe the condition of sea waves. The results of data processing showed that tropical cyclone Claudia had a life span of 16 days with a maximum T-number of 4.5. The impact of tropical cyclone Claudia on sea wave conditions occurs when the tropical cyclone enters the mature stage, namely in the southern waters of Central Java to East Nusa Tenggara. Abstrak Secara geografis wilayah Indonesia berada pada daerah di bawah lintang 20° (baik Utara maupun Selatan) memiliki kemungkinan yang kecil untuk tumbuhnya siklon tropis. Siklon tropis merupakan badai dengan kekuatan yang besar yang dapat mempengaruhi kondisi atmosfer dan perairan di wilayah Indonesia. Penelitian ini bertujuan untuk menganalisis karakteristik siklon tropis Claudia dan pengaruh siklon tersebut terhadap kondisi gelombang laut di wilayah Selatan Jawa, Bali dan Nusa Tenggara. Analisis yang dilakukan yaitu meliputi data satelit Himawari-8 kanal IR digunakan untuk memantau intensitas kecepatan angin dan tekanan udara di pusat siklon dengan teknik Dvorak T-number. Data gelombang air laut untuk menggambarkan kondisi gelombang air laut. Hasil pengolahan data menunjukkan siklon tropis Claudia memliki masa hidup selama 16 hari dengan nilai maksimum T-number sebesar 4,5. Dampak siklon tropis Claudia pada kondisi gelombang air laut terjadi pada saat siklon tropis memasuki tahap matang yaitu pada perairan Selatan Jawa Tengah hingga Nusa Tenggara Timur.

Studi Mitigasi Bencana Tsunami Dengan Menentukan Run Up Dan Waktu Tiba Tsunami Daerah Banyuwangi I Putu Agum Suriajaya Maha Putra; Komang Ngurah Suarbawa; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 23 No 2 (2022): 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.2022.v23.i02.p08

Tsunami disaster mitigation studies have been conducted in Banyuwangi Regency by conducting research on the analysis of run-ups and tsunami arrival times for the Banyuwangi area. The research was conducted at the Meteorology, Climatology and Geophysics Agency region 3 Denpasar using the software Tsunami Observation and Simulation Terminal (TOAST). The data used in this study is secondary data in the form of magnitude and data on the depth of underwater earthquakes, with magnitudes of 7.0 to magnitude 8.5 that have the potential to cause tsunamis and earthquake depth data of 18 km to 65 km. From the results of data processing with the TOAST application obtained the results of run-up and tsunami arrival time. Maximum run-up data was obtained by 9,718 m while the fastest tsunami arrival time data to the coast is 4 minutes after the tsunami. Maximum run-up data is then used for mitigation and the fastest tsunami arrival time then can be made a mitigation scenario for tsunami disaster.

ANALISIS EFEK TAPAK LOKAL DARI GEOLOGI TANAH DI BADUNG SELATAN DAN KOTA DENPASAR DENGAN SURVEI MIKROTREMOR (STUDI KASUS GEMPABUMI NUSADUA 13 OKTOBER 2011) Adityo Mursitantyo; Komang Ngurah Suarbawa; Ardhianto Septiadhi
BULETIN FISIKA Vol 16 No 2 (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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Local site effect from geology on South Badung and Denpasar City by microtremor measurements has been investigated. Ground predominant period was indicated by microtremor measurements with HVSR (Horizontal to Vertical Spectral Ratio) method. Subsoil A type was obtained by ground predominant period on Peguyangan, Pemecutan Kaja, Jimbaran, Uluwatu, and Jimbaran with ground predominant period range between 0.02 – 0.20 second. Subsoil B type was obtained on Canggu, Kerobokan, Denpasar City, Kesiman, Sanur, Sesetan, Kuta, Nusadua and Benoa Peninsula with ground predominant period range between 0.26 – 0.38 second. Subsoil C type was obtained on Seminyak, northern Sesetan and Sanur coast with ground predominant period range between 0.46 – 0.61 second. The conclusion, based on predominant period, geology, and data of damage due to October 13th 2011 Nusadua earthquake, areas with subsoil B and C type more susceptible than areas with subsoil A type when earthquake occur.Keywords : local site effect, microtremor, predominant period, HVSR

Analisis Kerentanan Wilayah Terhadap Gempabumi Berdasarkan Parameter Nilai Kerapuhan Batuan (B-Value) Dan Peak Ground Acceleration (PGA) Di Provinsi Bali Amalia Dwi Lestari; Komang Ngurah Suarbawa; I Wayan Supardi; I Putu Dedy Pratama
BULETIN FISIKA Vol 23 No 2 (2022): 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.2022.v23.i02.p04

Abstract - Bali is an area that is prone to earthquake hazards. This is because Bali is flanked by two causes of earthquakes, namely a subduction zone in the south and a back arc fault in the north. One of the efforts to minimize damage or loss caused by earthquakes is to analyze the vulnerability of an area to earthquakes. In this study, the earthquake parameters used as hazard indicators were the level of rock fragility (b-value) and maximum ground acceleration (PGA). Based on the results of the b-value calculation using the Maximum Likelihood method, the rock fragility level for the Bali region is obtained from 0.370 to 1.419. While the results of the PGA calculation using two empirical methods, namely the empirical M.V. Mickey and Lin Wu's empirical method is known that the empirical method of M.V. Mickey is more suitable for use in the Bali area than Lin Wu's empirical method, with PGA values ??ranging from 517.32-828.58 gal. So based on the results of the analysis of the two earthquake parameters, it is found that the area of ??Bali that is vulnerable to earthquakes is the western part of Buleleng Regency and most of Jembrana Regency. Keywords: b-value, PGA, Maximum Likelihood, M.V. Mickey, Lin Wu, Bali

ANALISIS TINGKAT KERAWANAN BAHAYA SAMBARAN PETIR DENGAN METODE SIMPLE ADDITIVE WEIGHTING DI PROVINSI BALI Tomy Gunawan; Komang Ngurah Suarbawa; Lestari Naomi L. Pandiangan
BULETIN FISIKA Vol 15 No 2 (2014): 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

Bali is a potential area prone to lightning strikes because it has a tropical climate with thepossibility of rain accompanied by lightning quite high and also vulnerable because of thepopulation density is very high. These conditions threaten the safety of lives and property of thepopulation, so it is necessary to study the vulnerability of lightning strikes in Bali. For identify thelevel of vulnerability to lightning strikes used two factors, the threat factors using CG(Cloud toGround) lightning incidence data (2009-2013) and vulnerability factors using data of populationdensity and land use for homes and buildings. Two factors were analyzed using the method of SAW(Simple Additive Weighting) to obtain level of vulnerability to lightning strikes each district. Theresults of the calculations show Selemadeg Barat, Denpasar, Kuta, Pupuan, Klungkung andSelemadeg have a high level of vulnerability to lightning strikes, 27 districts are in the middlecategory and the remaining 21 districts are in the low category.

Co-Authors Adityo Mursitantyo Adityo Mursitantyo Adnyana, I Gusti Agung Putra Amalia Dwi Lestari Ardhianto Septiadhi Ardhianto Septiadhi Audrey Vellicia Decky Irmawan Elvin Riyono Febi Niswatul Auliyah I G. A. Widagda I Ketut Putra I Ketut Putra I Nyoman Darma Putra I Putu Agum Suriajaya Maha Putra I Putu Dedy Pratama I Wayan Supardi I Wayan Wisnawa Saputra Indira Indira Ivan Bachtiar Pandapotan Jalut, Laura Laudensia Senly k krisna g Kadek Darmo Kadek Sumaja Kadek Sumaja Kholidatul Islamiyah Laura Laudensia Senly Jalut Lestari Naomi L. Pandiangan Made Padmika Mahayani, Ni Wayan Dewi Melki Adi Kurniawan Nandaru Diaz Ni Luh Desi Purnami Ni Nyoman Susi Kesuma Wardani Ni Nyoman Susi Kesuma Wardani Ni Putu Juliyant Ananda Rika Pangastuti Ni Wayan Dewi Mahayani Padmika, Made Ridwan Kusnandar Rudy Darsono Ryan Juliston Pangihutan Simanjuntak Saputra, I Wayan Wisnawa Satriya Wibawa, I Made Sukarasa, I Ketut Tomy Gunawan Wardani, Ni Nyoman Susi Kesuma Wisnu Ari Adi Wisnu Ari Adi

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