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INDONESIA
Buletin Fisika
Published by Universitas Udayana
ISSN : 14114690     EISSN : -     DOI : -
Core Subject : Science,
BULETIN FISIKA, ISSN 1411-4690 is a national and peer-reviewed journal published by Department of Physics Faculty of Mathematics and Natural Sciences Udayana University, Bali, Indonesia. This journal has been published since 1999 in print version until 2011. Started from 2012 on going, it is published in print as well as online version. The journal publishes twice in a year (February and August).
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Articles 111 Documents
ANALISIS RISIKO BENCANA GEMPABUMI DI WILAYAH NUSA TENGGARA BARAT Adi Kurniawan, Melki; Suarbawa, Komang Ngurah; Septiadhi, Ardhianto
BULETIN FISIKA Vol 18 No 1 (2017): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2017.v18.i01.p07

Abstract

An investigation of risk identification earthquake disaster in Nusa Tenggara Barat by three factors: the danger factor of earthquakes is Peak Ground Acceleration(PGA), vulnerability factor is population density by district, as well as the capasity factors are HDI (Human Development Index) by district in the province of West Nusa Tenggara has be done. PGA value calculation was performed using the attenuation function Fukushima and Tanaka with earthquake parameter data from 1970 - 2014 with the criteria of magnitude ? 4.5mB, depth ? 60 km and the epicenter in the range of 7.5o - 12o and 115o-120o BT and  for disaster risk index calculation earthquake using AHP (Analytical Hierarchy Process). From the calculation of the obtained regions with earthquake disaster risk levels are highest are southern Dompu, Mataram, Bima, northern Bima Regency while the lowest West Sumbawa regency and southern Sumbawa regency.
Content Fisika, Buletin
BULETIN FISIKA Vol 19 No 2 (2018): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

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

Abstract

Content
The effect of various disturbances on the seeds on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of cayenne pepper Seedlings Rupiasih, Ni Nyoman; Gita Hari Yanti, Ni Kadek; Sumadiyasa, Made; Manuaba, I.B.S.
BULETIN FISIKA Vol 19 No 1 (2018): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2018.v19.i01.p07

Abstract

Study on the effect of various disturbances on the cayenne pepper seeds (Capsicum Frutescens L.) to the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants in the germination period have been done. The disturbances given include UV-C irradiation for 1 hour (S1), microgravity for 12 hours (S2), for 24 hours (S3), and for 48 hours (S4), as well as combined disturbances that are UV-C irradiation for 1 hour followed by microgravity for 12 hours (S5), for 24 hours (S6), and for 48 hours (S7). As comparison, it has been used seeds without treatment called control (S0). The microgravity environment was created using a 2-D clinostat with a rotational speed of 2.7 rpm (1.2 x 10-4 g). All samples were grown in normal gravity (1 g) environment. Observations were made during the vegetative phase until the plant was 40 days old. Measurements of chlorophyll a, chlorophyll b, carotenoids, and biomass were performed at the plants were 10, 20, and 40 days old. The results showed that disturbances which given on the seeds gave positive effects on the content of chlorophyll a, chlorophyll b, carotenoids, and biomass of the plants. The impacts depend on the duration of the disturbances given.
Perancangan Pembangkit Listrik Tenaga Angin Dengan Turbin Ventilator Sebagai Penggerak Generator Padmika, Made; Satriya Wibawa, I Made; Trisnawati, Ni Luh Putu
BULETIN FISIKA Vol 18 No 2 (2017): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2017.v18.i02.p05

Abstract

A prototype of a wind power plant had been created using a ventilator  as a generator spiner. This power plant utilizes wind speed as its propulsion. Electricity generated in the DC voltage form between 0 volts up to 7.46 volts. The MT3608 module is used to stabilize and raise the voltage installed in the input and output of the charging circuit. For instrument testing, the wind speed on 0 m/s up to 6 m/s interval used. Maximum output of this tool with a wind speed of 6 m/s is 7.46 volts.
PEMANFAATAN RADIASI GAMMA Co-60 DALAM PEMULIAAN TANAMAN TOMAT (Lycopersicon esculentum L.) DENGAN METODE MUTAGEN FISIK Ari Kusuma Putra, I Gusti Agung Ngurah; Sutapa, I Gusti Ngurah; Antha Kasmawan, I Gde
BULETIN FISIKA Vol 18 No 1 (2017): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2017.v18.i01.p03

Abstract

A research on Co-60 gamma radiation effect of induced mutation in physiological growth of tomato plant (Lycopersicon Esculentum L.) has been done. Tomato plant quality can be improved through induced mutation Co-60 gamma radiation. Genetic change could be caused by induced mutation from radioactive material as a human effort. IRPASENA plant with Co-60 gamma radiation source exposed with dosage treatment of 50 Gy, 100 Gy, 150 Gy, 200 Gy and 250 Gy in tomato seeds. The measurement carried out against the physiological growth of plant height, leaves width, amount and weight of tomato fruits at the first week until harvest time. Result shows that the correct radiation dosage for tomato breeding is 100 Gy. Radioactivity concentration in improved tomato fruits after radiation exposure is less than 1.00 Bq/kg. Vitamins content on improved tomato fruits after exposure, particularly on vitamin C is 130.000 mg/kg compared to control fruit that is 70.000 mg/kg, the vitamin B1 also shows increased value (0.63 mg/kg) compared with control fruit (0.496%).
Analysis of Changes in Area of Mangrove Density at Ngurah Rai Bali Grand Forest Park Using Image of Landsat 8 Satellite Darmo, Kadek; Suarbawa, Komang Ngurah; Widagda, I Gusti Agung
BULETIN FISIKA Vol 19 No 2 (2018): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2018.v19.i02.p04

Abstract

The study is report about to estimate the change of mangrove density level of Ngurah Rai Bali Forest Park from 2014 until 2017 using image of Landsat satellite 8 which was processed with ArcGis software. The density level was determined by using the NDVI method and grouped according to the NDVI range according to the Ministry of Forestry’s rules of 2005. The result shows that in the rare area, the change in the area of density reduced by 23.67 ha, in medium area decreased by 16.74 ha, in the tight area increased by 24.3 ha, and in the total area of mangrove reduced by 16.11 ha. Those results obtained with accuracy of 100 %, 67 %, 93% and 90 % in rare area, medium area, tight area and total area, respectively.
Validation of Daily Rainfall Based on Global Satellite Mapping of Precipitation (GSMAP) Data of Bali and Nusa Tenggara Region Natadiredja, Sanjaya; Sukarasa, I Ketut; Sutapa, Gusti Ngurah
BULETIN FISIKA Vol 19 No 1 (2018): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2018.v19.i01.p03

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.
Alat Monitoring Suhu Melalui Aplikasi Android Menggunakan Sensor LM35 dan Modul SIM800L Berbasis Mikrokontroler ATMega16 Sawita, I Kadek Agus Sara; Supardi, I Wayan; Putra Adnyana, I Gusti Agung
BULETIN FISIKA Vol 18 No 2 (2017): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2017.v18.i02.p03

Abstract

It has been successfully designed a temperature monitoring instrument through android application using LM35 sensor and SIM800L module based on ATMega16 microcontroller. The temperature is measured using a LM35 sensor which produces a voltage and sent to ADC. Microcontroller ATMega16 is using as the main processor of this monitoring instrument to calculate the program, so that analog data in the form of input voltage are converted into digital data form a measurable temperature. The measurable temperature is sent and saved in the database on the server computer using the SIM800L module so it can be displayed on the website. The website pages are accessed with android programs that installed on the smartphone so that measurable temperature data can be monitored using a smartphone. The measurable temperature results can be displayed on a 2x16-character LCD in the instrument designed. Compatibility of monitoring instrument with comparison instrument is 99,97 %.
The Study of Current-Voltage (I-V) Characteristic Curve of Chitosan-Silver Nanoparticle Composite Membrane Islami, Maulida Nirwana; Rupiasih, Ni Nyoman; Sumadiyasa, Made; Sujana Manuaba, I B
BULETIN FISIKA Vol 19 No 2 (2018): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2018.v19.i02.p01

Abstract

A study of the current-voltage (I-V) curve of the chitosan-silver nanoparticle composite membrane (Ch-AgNP) has been conducted. Membranes were prepared by casting method using chitosan as matrix, acetic acid 1% as solvent and silver nanoparticle (AgNP) as filler. AgNP used was 100 ?g. As a comparison is a pure chitosan membrane (membrane Ch). The I-V measurement was performed using a cell model consisting of 2 chambers, chambers 1 and 2. The voltage (V) was measured using Ag/AgCl calomel electrode in electrolyte solution of KCl and CaCl2 with concentration of 0.025 M. All measurements were done at room temperature ± 28 0C. The result shows that in the current range 0.66-0.98 mA, the I-V curve of the Ch-AgNP membrane is ohmic. The conduction value of the composite membrane is smaller than that of the chitosan membrane and the value is greater in the KCl solution than in CaCl2 solution.  
Perancangan Alat Ukur Kadar Alkohol Menggunakan Sensor Mq-3 Berbasis Mikrokontroler Atmega16 Surya Merta, I Gede; Widagda, I Gusti Agung; Alit Paramarta, Ida Bagus
BULETIN FISIKA Vol 18 No 2 (2017): BULETIN FISIKA
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2017.v18.i02.p06

Abstract

It has been successfully designed an alcohol levels measuring instrument using MQ-3 sensor. The detected alcohol levels processed to be displayed on GUI Visual Basic 6.0 through several circuits, the sensor circuit, the Atmega16 microcontroller minimum system, 5V voltage regulator circuits, CH340 serial communication module and GUI Visual Basic 6.0. The entire circuit is powered by 5VDC regulator circuit. The measurement range of this instrument measures alcohol level in the range 0% to 70%, the levels measured by the instrument will be classified according to the regulations sets by Indonesian government. The instrument works by employing the characteristics of the MQ-3 sensor which has proportional voltage change with alcohol levels that is detected. The Atmega16 circuit is the main unit for data processing, the microcontroller performs the analog to digital data conversion and estimates this digital data into matching alcohol levels. Alcohol content data that processed is displayed on the GUI Visual Basic 6.0 through serial communication module CH340. Detected alcohol levels by this instrument compared with the alcohol levels of sample is match by 99.57%.

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