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Department of Physics, Udayana University Kampus Bukit Jimbaran Badung Bali, Indonesia 80361
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INDONESIA
BULETIN FISIKA
Published by Universitas Udayana
ISSN : 14114690     EISSN : 25809733     DOI : https://doi.org/10.24843/BF.2019.v20.i02
Core Subject : Science, Social, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics
The Journal aims to promote the theory and application in the field of physics, and to encourage a vigorous dialogue between scholars and researchers all over the world. It presents original research articles, letters as well as review articles, publishes the latest achievements and developments in physics and related fields. All contributions shall be rigorously refereed and selecting on the basis of quality and originality of the work as well as the breadth of interest to readers. Accepted papers will immediately appear online. The Journal welcomes contributions which manuscript is written in Indonesian or English.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 215 Documents
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Earthquake Relocation in Northern Bali Island in 2015-2017 using Double Difference Method (DD) Nandaru Diaz; Komang Ngurah Suarbawa; Adityo Mursitantyo
BULETIN FISIKA Vol 19 No 2 (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

A research about earthquake relocation in Northern Bali Island in 2015 – 2017 using the Double Difference (DD) method has been carried out. Earthquake relocation is important to get some informations about earthquake locations with high accuracy, fault zone identification, earthquake distribution and seismic analysis. The results of the relocation indicated that there was a displacement of the location of earthquake that formed moving closer to the earthquake source namely a fault. Relocation using HypoDD program gave high accurate result indicated by the RMS residual time value close to zero e.g. 0,000 - 0.01 which mean the results of calculations and observations are closed to the real value.
Identification Of Press Brick Composition As A Sound Absorbers Ni Made Wedayani; I Gde Antha Kasmawan; Windaryoto Windaryoto
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

Abstract – Sound absorption research using the press brick made of cement and sand has been done. The research was conducted to determine the effect of mixture on the absorption coefficient value of sound of the brick. In this research have made three variations ratio of cement : sand, that is 1:15, 1:10 and 1: 5 at pressure of 0.30 MPa. The physical quantity measured is the intensity of sound (dB) in the cube-shaped building model (74 x 74 x 68) cm3 by using a sound level meter. The intensity of sound is determined by nomogram method by varying the sound frequency of 1 - 10 kHz for 5 minutes. It is found that the absorption coefficient value increases with increasing frequency. At frequency range of 1 – 6 kHz, brick with ratio cement : sand of 1:15 has the highest absorption coefficient value, while at frequency range of 6 - 10 kHz, brick with ratio cement : sand of 1: 5 which has the highest absorption coefficient value.
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.
Determining Crystallite Size Using Scherrer Formula, Williamson-Hull Plot, and Particle Size with SEM Made Sumadiyasa; I.B.S. Manuaba
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

It has been determined the crystallite size by XRD technique using Scherrer equation and Williamson-Hull Plot method. While the particle size is determined by SEM using Image-J software. For this purpose, synthesized samples of compound Gd0,95La0.05Ba2Cu3O7-d phase. From the calculation results, obtained the crystallite size in nanometers order, however the crystallite size resulting from the Scherrer equations and Scherrer Modified is different, i.e. 63.1675 nm and 67.0005 nm. The results of the crystallite size calculation by the scherrer equation directly and modified differed from that of the Williamson-Hull Plot method (97,3040 nm). Meanwhile, the results of the Williamson-Hull Plot methods and SEM show almost the same value (98.7297nm).
Studi Standarisasi Radioterapi Cobalt-60 Terhadap Kuantitas Sel Darah Pada Penderita Kanker Serviks (Cancer Cervics) Di Rsup Sanglah Denpasar Retianingsih Oeta Ulan; Gusti Ngurah Sutapa; Wayan Balik Sudarsana
BULETIN FISIKA Vol 18 No 2 (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

After doing research with Title Study of Cobalt-60 radiotherapy Standards Against Quantity Blood Cells In Patients with Cervical Cancer (Cancer Cervics) at Sanglah Hospital in Denpasar. This study uses secondary data such as a complete blood from each patient with cervical cancer in 2015 that radiotherapy with fractionation method. The amount of patient data used in this study is 5 pieces. The quantity of blood cells that are analyzed include RBC, HGB, WBC and WBC Components (LY, EO, EO, BA, NE, MO). Fractionation dose is 800-5800cGy. The results of data analysis showed that each blood cell components are still within the range of 2-50%, so a method of radiotherapy is still fit for use.
STUDI SINTESIS NANOPARTIKEL PERAK DENGAN METODE BIOLOGI MENGGUNAKAN TANAMAN SAMBILOTO (Andrographis paniculata Ness) Septiana Ribka Purnomo; Ni Nyoman Rupiasih; Made Sumadiyasa
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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This study is report about the synthesis of silver nanoparticles (AgNP) using biological method (biosynthesis) using sambiloto plant extracts (Andrographis paniculata Ness). Plant part used is the leaves and extract process is done with demineralized water (aqua-dm). The synthesis is done at a ratio of AgNO3 solution with sambiloto extract solution is 10 µl : 10 ml. Characterization techniques that have been made include UV-Vis spectrophotometer, X-ray diffraction (XRD) and Transmission Electron Microscope (TEM). The results showed that silver nanoparticles formed has absorbance of SPR (surface plasmon resonance) peak at a wavelength of about 423 nm. XRD characterization of the structure obtained FCC (face center cubic) with a lattice parameter is 4.031 Å, diffraction peaks at 2q = 38,18o, 45,81o and 64,87o each corresponding to the (h k l) of (1 1 1), (2 0 0) and (2 2 0) respectively. TEM characterization obtained that the particle size distribution is 10 – 30 nm.
Analysis of Leachate of Soil Water Pollution Using Geo-electrical Methods in Final Processing Place (TPA) Regional Sarbagita Ni Kadek Sugestiani; I Ketut Sukarasa; I Ketut Putra
BULETIN FISIKA Vol 19 No 2 (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

A research about analysis of leachate of soil water pollution using geo-electrical methods in final processing place (TPA) regional sarbagita has been conducted. The measurements were made on 4 tracks by using a Naniura NDR 300HF resistivity meter. The results show on track 1 and track 2 indicate there is a leachate with a resistivity value ranging from 2.67 to 5.74 ?m and 3.15 to 9.19 ?m respectively, on track 3 indicate that the distribution of leachate has decreased compared to paths 1 and 2, on the 3 leachate path there are only certain points with resistivity values ranging from 6.57 to 9.66 ?m. Measurement results on track 4 the resistivity is greater than 10 ?m, this indicates that on track 4 there is no leachate pollution. The results of the analysis of well water samples which are located right on tracks indicating the content of BOD (biochemical oxygen demand), COD (chemical oxygen demand), Cyanide (CN), Lead (Pb), E. coli and coliform which exceeded the quality standard limits.
Characterization Porosity on Ceramic Body Stoneware Based Kalimantan Clay Putu Ekayani Sri Tussniari; I Gusti Agung Putra Adnyana; Made Cingah
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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It has been made ceramic body stoneware using a mixture of Kalimantan clay, RRC feldspar, Belitung kaolin, Belitung quartz and Bukit Jimbaran limestone further coded BPC-1. This study aims to determine the value of dry shrinkage, the effect of sintering temperature of 900oC and 1200oC against firing shrinkage, and the influence of sintering temperature of 900oC and 1200oC against porosity in the ceramic body stoneware. Ceramic stoneware burned with a temperature variation of 900oC and 1200oC. The results show the value of dry shrinkage in ceramic stoneware of 2.9%. Stoneware ceramic firing shrinkage at a temperature of 900 oC combustion of 1.3%, and the combustion at a temperature 1200oC of 3.8%. Porosity ceramic stoneware at a temperature of 900oC combustion showed porosity of 10.5%, while the combustion at a temperature 1200oC of 5.5%. Show that the combustion temperature greatly affects the value of dry shrinkage, firing shrinkage and porosity of stoneware ceramics. The higher the combustion temperature the higher the shrinkage and the decreasing the porosity.
PENGARUH TINGKAT INTENSITAS GELOMBANG ULTRASONIK TERHADAP JUMLAH SEL DARAH PUTIH (LEUKOSIT) DAN SEL DARAH MERAH (ERITROSIT) PADA MENCIT M. Zully Amrul Hadi; I Gusti Ngurah Sutapa; I Gde Anta Kasmawan
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

The level of sensitivity and auditory responses observed due to the influence of sound waves can be used as bio-indicators of noise. The aims of this study are to determine the effect of the intensity level of ultrasonic waves to leukocytes and erythrocytes, and to observe the optimal intensity level that can affect the quantity of leukocytes and erythrocytes of mice. Ultrasonic waves with varying levels of intensity of 70 dB, 75 dB, 80 dB, 85 dB, and 90 dB were exposed to the mice for 2 hours, then the quantity of leukocytes and erythrocytes of the mice were observed. The average number of leukocytes in those variation of the intensity level respectively are (4,13±0,50) x103; (5,20±0,62) x103; (5,48±0,72) x103; (5,87±0,65) x103 dan (6,04±0,32) x103; while the average number of erythrocytes respectively are (7,29±0,14) x106; (7,10±0,22) x106; (6,18±0,24) x106;( 5,96±0,52) x106; dan (5,75±0,41) x106 . The average number of leukocytes increased, while erythrocytes decreased as the increasing of intensity level of ultrasonic waves. The optimal intensity level of ultrasonic waves affecting the quantity of leukocytes and erythrocytes of mice has not been known yet from this study.
ANALISA TIME LAG SUHU PERMUKAAN LAUT YANG BERHUBUNGAN DENGAN CURAH HUJAN RATA-RATA DASARIAN DI PROVINSI BALI I Made Sudarma Yadnya; Winardi Tjahyo Baskoro; M. Dwi Jendra Putra
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

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Abstract

Variability of rainfall a region often associated with global weather conditions, regional and local areas. Effect of local weather parameters such as sea surface temperatures (SST) around the island of Bali is still needs to be studied to determine its relationship with the average dasarian (accumulated ten days) rainfall variability of each regency/municipality in the province of Bali especially associated with the time lag. Value of correlation coefficient between the average dasarian of SST around Bali at time lag 0, -1 dasarian, -2 dasarian, and -3 dasarian with the average dasarian rainfall of each regency/municipality in the province of Bali is quite varies, where the lowest value of the correlation coefficient is 0.099 and the highest is 0.587. The average dasarian of SST around Bali island on time lag -1 dasarian have correlation values higher than the time lag 0, -2 and -3 dasarian. The sea surface temperatures of sea area Southeast and Southwest Bali island tend to have a fairly strong correlation with the average dasarian rainfall of each regency/municipality in Bali with an average value of correlation coefficients for each time lag ranging from 0.403 - 0.467.Keywords : sea surface temperature, rainfall, time lag

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