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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 6 Documents
 1 
Search results for , issue "2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015" : 6 Documents clear
PREDIKSI PERHITUNGAN DOSIS RADIASI PADA PEMERIKSAAN MAMMOGRAFI MENGGUNAKAN ALGORITMA JARINGAN SYARAF TIRUAN PROPAGASI BALIK Arifin, Zaenal; Sutanto, Heri; Pamungkas, Adi; Setiawan, Rudi
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Dose radiation calculation systems in mammography examination can be approximated by models of Artificial Neural Network (ANN) back propagation algorithm. In this study we performed with data from the measurement of air dose mammography and data measurement dose of radiation detectors. ANN architecture by using two inputs and one output. From the simulation results of training resulted in a correlation coefficient of 0.9994 and the MSE of 5.2907e-05. From the test results obtained by the correlation coefficient of 0.9370 dan MSE value generated is equal to 2.2026. this suggests that the neural network algorithm can be implemented to calculate the amount of radiation dose in mammography examination. Keywords: Radiation Dose, Mammography, Artificial Neural Network, Accuracy. 
PENINGKATAN SIFAT MAGNETIK MATERIAL HEMATIT MELALUI SUBTITUSI BARIUM DAN KONTROL TEMPERATUR SINTERING Widanarto, Wahyu; Fauzi, Fuzi Nurrahman; Cahyanto, Wahyu Tri; Effendi, Mukhtar
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Ferrite magnet or ceramic magnet is a competitive product in the magnet market due to low price, corrosion resistant and chemically stable. Barium hexa-ferrite magnet is one of ferrite magnet which is mostly used as magnetic storage and electronic devices based on nanotechnology. Barium hexa- ferrites are synthetized through solid state reaction method at sintering temperatures of 1100 °C with the composition (100-x)Fe2O3 : xBaCO3 , where x = 0 and 20 in mol % . Results of XRD characterization show that the diffraction peaks of XRD spectrum is dominated by the peaks of barium ferrite crystal with a hexagonal crystal system. Magnetic properties of Fe2O3 material doped with barium carbonate of 20 mol % and sintered at 1100 °C increase significantly compared to the others. This simple and inexpensive method is very promising for the manufacture of barium hexa-ferrite materials with natural ferrite as the main material.Keywords: Iron sand, barium ferrite, structure, magnetic properties
Berkala Fisika Vol. 18 No. 4 Tahun 2015 Berkala Fisika, Tim Redaksional
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Berkala Fisika Vol. 18 No. 4 Tahun 2015
SINTESIS LAPISAN TIPIS SENG OKSIDA DIDOPING PERAK (ZnO:Ag) DAN APLIKASINYA UNTUK PENDEGRADASI POLUTAN ORGANIK AIR Sutanto, Heri; Nurhasanah, Iis; Hidayanto, Eko
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Zinc Oxide (ZnO) is a semiconductor material that is used for photo-catalyst to degrade organic pollutants. The addition of doping silver (Ag) in ZnO can increase the photo-catalytic activity in the degradation process. In this study, the addition of doping Ag in ZnO thin film on a glass substrate deposition using thermal spray coating method has influence on the micro-structure and photo-degradation in presence of bacteria Escherichia coli (E. coli) as an organic pollutants has been investigated. Micro-structure of ZnO : Ag layer were characterized by Scanning Electron Microscopy (SEM) and photo-degradation activities of bacteria were tested with Total Plate Counter (TPC). The results show that doping Ag in ZnO give affect the topography of the surface that can increase in amount of grains and grain size in order to increase the photo-catalytic activity. It indicated by decrease in amount of E. coli bacteria from the initial sample with percentage of degradation is 99,99951% Keywords: Semiconductor, photo-catalyst, ZnO, doping Ag, micro-structure, photo-degradation
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
PEMBUATAN SISTEM KENDALI POSISI AUTOFOKUS EKSPERIMEN LENSA DENGAN MOTOR LANGKAH Gunadi, Isnain; Gernowo, Rahmat; Adi, Kusworo
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

The automatic lens experiment with stepper motor position control has been made. Main component of this device are stepper motor which move the lens and screen. Microcontroller is contens the programs of motor movement controller. The screen contain of Light Dependent Resistor (LDR) as voltage sensor. This image will focused when the voltage in the screen is maximum. The result of test show that the automatic measurement is more accurate than manual measurement.Keywords: Auto-Fokus, LDR, IPMC, LSW, EAPs, VCM

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