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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 184 Documents
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PENDETEKSIAN INTRUSI AIR LAUT DENGAN METODE GEOLISTRIK RESISTIVITAS KONFIGURASI WENNER DI DESA CANDIKUSUMA KABUPATEN JEMBRANA BALI I Nyoman Darma Putra; Komang Ngurah Suarbawa; I Made Satriya Wibawa
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

Studies have been conducted to detect the intrusion of sea water in the Candikusuma village, Melaya District, Jembrana regency, Bali. Sea water intrusion is the ground water contamination in the soilto make fresh water into salt. To determine the presence of sea water below the soil surface be used geoelectric resistivity method because sea water has aresistivity 0.2 ?m. Geoelectric resistivity method based on Ohm's law, aims to find a variety of material sundera layer of soil based on the distribution of resistivity values??. By injecting current through two current electrodes the potential can be measured by the electro depotential. Variations of resistivity will be obtained If the distance of each electro demodified, according to Wenner configuration. Smallest space used for all tracksis 5 m. The experiment data analyzed with the Software Res2 dinv. From the Software Res2 dinv obtained cross-section2-D, which indicates the presence of sea water on track1 which has a length 80 m with a resistivity 0.291 ?m, the length of track2 is 150 m with a resistivity 0.257 ?m, the length of track 3 is 150 m with a resistivity 0.203 ?m and track 4 with alength of 150 m has a resistivity of 0.287 ?m. From the analysis of the Software Res2 dinv sea water intrusionin the village Can dikusuma ± 470 m from the beach. Starting from the coordinates to coordinate .
SIMULASI MONTE CARLO UNTUK EVALUASI ANODE HEEL EFFECT PADA PESAWAT SINAR-X MENGGUNAKAN PAKET PROGRAM EGSnrc Sanggam Ramantisan; Choirul Anam; Priyono Priyono
BULETIN FISIKA Vol 13 No 1 (2012): 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 aimed to evaluate the anode heel effect on the x-ray machine for the variation of angle of anode target and tube potential. The research was conducted using Monte Carlo simulations with the EGSnrc package. The x ray was designed by BEAMnrc, whereas the phase space file was analyzed by BEAMDP. The x ray unit was designed by using Tungsten material in anoda structure. Total filtration that used was equivalent with 2,5 mm Aluminium. From the simulation found that the anode heel effect occurs only on an axis parallel to the axis x-ray tube, i.e. fluence of radiation on the cathode side is greater than the anode side. Provided that a larger angle of target will decrease the anode heel effect. Anode heel effect for angle variation on the voltage 80 kV were 17,25% (50), 15,65% (7,50), 14,65% (100), 6,96% (12,50), and 3,14% (150) respectively. As for variations in tube voltage was obtained that the anode heel effect is relatively small. Anode heel effect for the tube voltage variation on the tube anode angle 150 were 1.99% (40 kV), 2.20% (60 kV), 3.14 (80 kV), and 3.81% (100 kV) respectively.
PERSENTASE DOSIS KEDALAMAN (PERCENTAGE DEPTH DOSE) DENGAN PESAWAT TELETERAPI COBALT-60 FCC 8000 F DI RSUP SANGLAH DENPASAR Grace Christine Djara; Ni Nyoman Ratini; I Wayan Balik Sudarsana
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

Successful implementation of treatment using Cobalt-60 8000 F FCC, strongly influenced the precision and accuracy of the implementation is largely determined by the data PDD. Based on the research the value of PDD at a depth of 0 cm with a broad range of the field is at 39.7% - 48.5%, while the maximum value reached 100%  PDD found at a depth of 0.5 cm. The amount of deviation between the results of a study of the data and BJR Sanglah reached 5% at a depth of 8 cm by 6 cm wide field x 6 cm and 8 cm x 8 cm, and the smallest deviation value of 0.1% found in a wide field 6 cm x 6 cm with depth 7 cm.keywords: cobalt-60, the percentage depth dose, dispersion values
PENGARUH TEMPERATUR LARUTAN TERHADAP KARAKTERISTIK RAPAT ARUS-BEDA POTENSIAL MEMBRAN KITOSAN Angelia Bella Kusumaningtyas; Ni Nyoman Rupiasih; Made Sumadiyasa
BULETIN FISIKA Vol 17 No 2 (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 study about the characteristics of the diffusion current density-potential (J-V) of chitosan membrane has been done. It aims to determine the effect of concentration (C) and temperature (T) solution to J-V characteristic curve of the membrane. The membrane made of chitosan, as the base material (matrix) and 1% acetic acid as the solvent, with the composition of matrix/solvent of 2%. In the ion transport experiments, KCl electrolyte solution with various concentration of 0.1 mM, 1 mM, 10 mM, 100 mM, and 1000 mM and with variation of temperature of 300.9 to 340.9 K. The results showed that the value of the diffusion current density of ion sincreases with increasing the ratio of the concentration of solution in room 1 (C1) and room 2 (C2). The J-V curve shows non-linear relationship and it’s shifted toward larger potential with increased in temperature. These results indicate that the concentration gradient and temperature greatly affect the J-V characteristics of chitosan membrane.
TREATMENT OLI TRAFO TERHADAP PENINGKATAN TEGANGAN TEMBUS PADA TRAFO DISTRIBUSI KA 756 DI BY PASS NGURAH RAI I Gusti Ketut Abasana; I Wayan Teresna
BULETIN FISIKA Vol 14 No 2 (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 transformer is an electrical apparatus that is included in the classification of static electricity machine and serves to channel the energy / power from high voltage to low voltage or vice versa, with the same frequency. Transformer oil, according to the standard test PLN (SPLN) 49-1/1992 method IEC 158 and 296 shall have a minimum insulation resistance of 30 kV / 2.5 mm. This causes the decrease in insulation resistance not optimal power is supplied to the customer. Also can cause fatal damage to the transformer itself as the occurrence of a short circuit causing the transformer to explode. Therefore, to maintain performance or life time of the transformer itself needs to be treated at least once a year. Men-oil treatment is that efforts should be made to ensure that prisoners are permitted insulation standards and transformer can operate optimally.
PENENTUAN NILAI SUN PROTECTION FACTOR (SPF) SINAR MATAHARI DENGAN MENGGUNAKAN KAIN KATUN, POLIESTER DAN RAYON DI PANTAI KUTA Ni Putu Winiayu Veramika; I Gusti Ngurah Sutapa; Ni Nyoman Ratini
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

This research has been determined the value of a sun protection factor (SPF) of sunlight by using cotton, rayon, and polyester conducted at ten observation points along Kuta Beach, Bali. This research started by determination the intensity of the sunlight without fabric protector and the intensity of sunlight with a fabric protector such as cotton, rayon, and polyester with color blue, green, red, and yellow. Luxmeter is used to measure the intensity of sunlight in units of lux. The intensity was taken at the sunny weather in the range 10-11 o’clock to 16-17 o’clock. SPF value can be calculated by comparing the intensity of the sunlight without fabric protector (lux) with the intensity of sunlight with a fabric protector (lux). The intensity of sunlight in the range of 10-11 o’clock to 16-17 o’clock is approximately 59.760 lux to 138.660 lux. ANOVA analysis showed the intensity of sunlight at each point of observation did not differ significantly (. SPF value at each point varies and SPF values obtained for the maximum is the blue cotton fabric with SPF value is 30 and the minimum value is the yellow polyester fabric with SPF value is 3.
MENENTUKAN RESPON ADAPTASI TERHADAP KUANTITAS DAN KOMPONEN LEUKOSIT MENCIT (MUS MUSCULUS L) PASCA RADIASI GAMMA Co-60 Ni Luh Widyasari; I Gusti Ngurah Sutapa; I Wayan Balik Sudarsana
BULETIN FISIKA Vol 15 No 1 (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

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Abstract

Research has been conducted to study adaptive response of the quantity and components leucocyteafter Co-60 gamma radiation. This research used 20 male mice with an average weight of 20-30 gand aged 35-95 days. The male mice given adaptive dose 0,1 Gy followed by a continuous dose of 1Gy, 2 Gy and 3 Gy. Co-60 gamma radiation shows that the quantity of leucocytes decreased until the30th day is called lowest point. With 0,1 Gy adaptive dose shown to reduce leucocyte damage by13,95% compared with no adaptation dose. After passing through the lowest point, the quantity ofleucocytes increased until the 60th day. With an increase in the adaptive dose is faster to reach anincrease of 25,16%. On leucocyte component, which has increased similar with quantity leucocytes isthe neutrophil segment and lymphocytes.
The Effect of Firing Temperature on Water Absorption and Flexural Strength on The Preparation of Stoneware Ceramic (Coded-BL1P) G. Agus Permana Putra Sujana; Putu Suardana; Totok Nugroho
BULETIN FISIKA Vol 20 No 1 (2019): 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 investigated the effect of firing temperature on water absorption and flexural strength in the manufacture of BL1P code stoneware ceramics. Ceramics are made in the form the test block bar with materials from of Borneo Clay Noodle, PRC Feldspar, Kaolin Belitung, Belitung Quartz, Ballclay Bantur, Bentonite, and Talk with a simple casting method. The block bar of the molds was burned at four temperature variations, i.e. 850, 900, 1000, and 1200 oC. From the results of measurements of it water absorption, it was found that the increase in firing temperature from 850 oC to 1200 oC showed a decrease in water absorption from 18.3% to 5.5%, while the measurement of it flexural strength showed an increase in flexural strength of 11.6 kg/cm2 to 19.8 kg/cm2.
ANALISA ANGIN ZONAL DALAM MENENTUKAN AWAL MUSIM HUJAN DI BALI BAGIAN SELATAN Nikita Pusparini; Winardi T.B; Decky Irmawan
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

Zonal wind analysis has been investigated to determine the beginning of the rainy season in the southern part of Bali which is limited by 8 ° 30 'S - 8 ° 48' S and 114 ° 57 'E - 115 ° 26' E. This research used the WRPlot view, a Windows-based software with Rose Wind as the image results. By this software, the variations of monthly average surface wind can be known. The average wind conditions in the southern part of Bali is influenced by the activity of the east-west monsoon. Based on the data processing year 2003 - 2012, the beginning of the rainy season generally begins on November. From the analysis of zonal wind shown that when the zonal wind is negative, it indicates the west monsoon, so the rainfall has increased. The calculation result shows that the percentage of suitability of zonal wind analysis can be used to predict the beginning of the rainy season with a percentage of 85.00% conformity with the very good category.Keyword: zonal wind, monsoon, Wind Rose
PENGARUH KUALITAS TINGKAT PENERANGAN LAMPU, LINGKUNGAN KERJA DAN PERALATAN TERHADAP PRODUKTIVITAS KERJA TEKNISI REPARASI ELEKTRONIK DI WILAYAH KABUPATEN BADUNG I Wayan Teresna; Djoko Suhantono
BULETIN FISIKA Vol 13 No 2 (2012): 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

Quality level of illumination, work environment and equipment is one of the principal indicator in determining productivity. This paper presents the results of research on electronic technician answers as respondents in Badung on the effects of lighting levels, work environment and work productivity tools. As the analysis used include correlation test, test and test simultaneous partial t F. Based on the results of this study tests the hypothesis that the correlations obtained between the productivity level of illumination is very weak, then the working environment and equipment also has a very weak correlation. While partially test the hypothesis that the level of illumination has no effect on labor productivity electronics technician, as well as the working environment and equipment has no effect on labor productivity technicians. If the F test simultaneously at the level of illumination, the working environment and equipment also had an influence on productivity of electronics technician working in Badung.

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