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INDONESIA
BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
Arjuna Subject : -
Articles 369 Documents
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REVIEW OF A SIMPLE POWERFUL POLARIZER FOR TESTING OF EDIBLE OIL QUALITY Firdausi, Ketut Sofjan; Rahmawati, Henik
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

In this paper, we have shown that a simple pair of polarizer can be used to measure natural optical activity in total complex oil (vegetable oil and fats). A similar concept with quantum physics has been discussed to describe briefly the probability in finding a particle within certain region with the change of polarization due to the interaction light with saturated fatty acids. The light source was fluorescence lamp and the experimental condition was kept stable, i.e. constant temperature and constant humidity. The angle of polarization was measured repeatedly until 50 times. Our relative uncertainty measurement has been obtained up to 5% and this is obviously clear to be able to differentiate various different quality of oil. More important result is that ordinary light polarization can be used as powerful test to show various quality level of oils better than recent standard methods. A good prospect has also been obtained for halal level testing. It is found that average value of polarization in lard (pig oil) is relatively higher than the others.Keywords: polarization, oil quality, saturated fatty acid
Cover Oktober 2009 Oktober 2009, Cover
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cover Berkala Fisika Oktober 2009
SIMULASI MONTE CARLO UNTUK MENENTUKAN DOSIS SINAR-X 6 MV PADA KETAKHOMOGENAN MEDIUM JARINGAN TUBUH Rizani, Alfian; Setiabudi, Wahyu; Anam, Choirul
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
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Abstract

Study on dose distribution of human body at 6 MV X-ray beam has been done using Monte Carlo Simulation. This study is aimed to define dose distribution of soft tissues, lungs andbones also corrections factor due to tissue inhomogeneity.The study was conducted by Monte Carlo Simulation using EGSnrc software, i.e.BEAMnrc and DOSXYZnrc. The linear accelerator head was simulated by BEAMnrc  with SSD100 cm and field size 10 x 10 cm . The calculating of radiation dose distribution at homogen andnonhomogen phantom that have size 40 x 40 x 40 cm in tissues of human body, such as softtissues, lungs and bones were made by using DOSXYZnrc. Nonhomogen phantom of human bodywas made by insert lungs or bones with thickness 10 cm in soft tissues at depth of 5 cm – 14 cm.It is obtained that the dose distribution of soft tissue and water phantom have samecharacteristic which both of them have maximum dose (D ) at depth of 1,5 cm. Inserting of lungswith a thickness of 10 cm in soft tissue results to the increasing of dose until 12,2 % and insertingof bones with the same thickness with lungs results to decreasing of dose until 10,3 %. The rangeof correction factor due to inserting lungs is 1,00–1,27 and for bone is 0,81–1,05.Keywords:Monte Carlo Simulation, PDD (Percentage Depth Dose), corrections factor
Sistem Pendeteksi Suhu dan Asap Pada Ruangan Tertutup Memanfaatkan Sensor LM35 Dan Sensor AF30 Usuman, Ilona; Aardhi, Hasmi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

As is known together for this cause of the fire is very varied, ranging from natural factors, or electrical short circuit can occur because of the element of intent. Due to these reasons, so it is necessary to have a system that can detect early occurrence of fire. Fire monitoring system must be able to accommodate the nature of the fire.By leveraging the LM35 sensor that functions observed rise in temperature and observing the presence of smoke sensors AF30 can be created around the smoke detector and temperature using LM35 sensor and microcontroller AT89S51 AF30 sensor and equipped with facilities to send sms if there is any indication of a hazard or fire will occur. The results show that the system could work well in the prototype room with a distance of heat source and smoke source ± 5cm from the two sensors, when the system detects hot and smoke, the water pump, buzzer and fan that is connected to a relay works, then sms will be sent to the user. The temperature sensor detects the heat from 25 degrees to 60 degrees, while the temperature is 55 degrees is considered dangerous. Sensors detect smoke cloud of smoke from 30 to 125 mvolt mvolt, cloud of smoke which is considered the danger is over 125 mvolt.   Keywords: Fire, LM35 temperature sensor, smoke sensor AF30, Short Message Service (SMS)
PENGARUH JARAK PADA KUALITAS CITRA HASIL REKONSTRUKSI MODE FAN BEAM DENGAN GEOMETRI DETEKTOR BERUPA GARIS Anam, Choirul; Widodo, Catur Edi
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
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Abstract

Image recontruction for fan beam mode with line geometry of detectors have been done. Theobject being imaged is the Shepp-Logan phantom with matrix size 50x50. Projections were made forangle 00 to 3600 with angle interval 10. The distance between the rays in the midle of the object (s) isequivalent to 1 pixel. The distance of source to central of object (D) were varied 40,50, 60, 70, 80, 90,100, 110 pixels. Reconstruction of image was carried out by the method of filtered back projection(FBP) with Lek-Ram filter. It is obtained that if the distance of X-ray source and center of the object,smaller than 3/4 diagonal object, the image will be distorted, and if the distance is greater than 6/7diagonal object, the image will be clipped.Keywords: Image reconstruction, fan beam, line geometry of detector
Efek Magnetooptis Pada Lapisan AgBr Terekspos Sulistyo, Respita; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
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Abstract

The non linear optic characteristic from several transparent medium (film plate and glass) under influence of external magnetic field and variation of wavelengths, have been identified. In this experiment, the developed AgBr film is deposited on a hologram. The magnetic field has been produced by coils which connected to slide regulator (0-240V). The maximum value of magnetic field is about 182,0 mT. Light sources used are He-Ne Laser with a wavelength of 633 nm and 1 mW in power, and green laser pointer with a wavelength of 532 nm and power less than 5 mW. The optical characteristic measured in this experiment is the rotation of electric field, of the transmitted laser beam due to applied external magnetic field to the medium. The experiment result shows that  is dependent linearly on magnetic fields. The Verdet constant is proportional with wavelength of the light. Measured values for Verdet constant (V) at 632,8 nm is (0,487300,00070) min/G-cm and at 532 nm is (0,261700,00056) min/G-cm for glasses material and the values for Verdet constant at 632,8 nm is (0,328500,00060) min/G-cm  and at 532 nm is (0,156900,00039) min/G-cm for film plate.   Key words:Magnetooptical effect, non linear optic, Verdet constant
ANALISIS DISTRIBUSI TEMPERATUR PERMUKAAN TANAH WILAYAH POTENSI PANAS BUMI MENGGUNAKAN TEKNIK PENGINDERAAN JAUH DI GUNUNG LAMONGAN, TIRIS-PROBOLINGGO, JAWA TIMUR Nur Faridah, Sri Ana; Krisbiantoro, Agus
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
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Abstract

Geothermal is a good alternative energy for this country. Are on track the ring of fire that able to make Indonesia has big and plenitude geothermal reserve. There are 11 regions in East Java that predict as geothermal prospect’s regions. Mount Lamongan’s region, Tiris- Probolinggo, East Java is the object of this research. The existence of geothermal in a region can identify with the surface manifestation, such as hot spring, fumaroles, geyser, hot mud, etc. Remote sensing technique can be use for identifying the indication of geothermal potency from the land surface temperature in the research region. Data analysis from Landsat 7 ETM+ path/row 118/65 (in 6 band thermal) in 2010-2013, it will describe of land surface temperature of geothermal prospect in study area. The result of land surface temperature showed that there is a heat distribution in the study area where the temperature ranges from 37oC up to 67oC, and it is alleged indication of geothermal. Therefore, it is interesting to study as the first step to explore geothermal safe and easy. Keywords: geothermal potency, land surface temperature, remote sensing, Landsat 7 ETM+ imagery, mount Lamongan.
STUDI PEMANFAATAN ENERGI MATAHARI SEBAGAI PEMANAS AIR Sidopekso, Satwiko
BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
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Abstract

Using the principle of a box in a black body  covered  with glass crystal, Energy from the sun light which was emit thermal radiation energy of 1000 Watt/m2 at the day light under  Standard Test Condition (STC), the head from the sun light will be speared in the box. Water from the storage tank will circulate without using a booster pump according to the principle thermoshipon to pass through the head collector pipes made of copper in a closed circulation and returned to the water storage tank. With water heating system is expected to have hot water with temperatures above 60o Celsius during the day.   Key word : Solar Energy ; Head Collector; Thermoshipon.
Redaksional April 2015 Berkala Fisika, Tim Redaksi
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Redaksional April 2015
Aplikasi Plasma Lucutan Berpenghalang Dielektrik pada Peningkatan Kualitas Air dengan Mengalirkan Air secara Langsung dalam Reaktor Berkonfigurasi Elektroda Spiral-Silinder Muhlisin, Zaenul; Oktiyana, Wulandary; Nur, Muhammad
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Abstract

A dielectric barrier discharge plasma reactor has been realized and characterized with air source as a working gas. Ozone and dissolved ozone concentration were measured at various voltages (4 to 8 kV), treatment time ( 1 to 5 minutes), water flow rate 4.167 l/min and different air flow rates (1.5 and 2.5 l/min). And the other hand, for understand the ability of ozone to improve water quality, dissolved oxygen has been measured at various voltage (3.6 to 5.2 kV) and after treatment time (until 90 minutes). Spiral electrode is made by copper wire with circumference length 500 mm and diameters 1 mm, while cylindrical electrode is made from aluminum foil with 450 mm in length. Aluminum foil is stuck at inner wall of PVC tube with 500 mm in length and diameter 1.25 inch. Pyrex is used as dielectric material, with length 500 mm, inner diameter 10 mm and thickness 1 mm The result show ozone is produced have maximum concentration 15.613 ppm and dissolved ozone have maximum concentration 10.305 ppm. As a whole ozone concentration higher than dissolved ozone concentration. Both of ozone and dissolved ozone concentration increases by increase of the voltage applied, increases by increase treatment time and increases by decrease of the gas flow rate inside the reactor. Command dissolved oxygen increases with the increase of the high voltage applied and increases after dissociation ozone in water. Key Words : spiral cylindrical electrode, dielectric barrier discharge, the ozone concentration, the dissolved ozone concentration, dissolved oxygen

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