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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 366 Documents
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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. 
KAJIAN PENGARUH WARNA DAN JARAK LAMPU PENGAMAN TERHADAP HASIL RADIOGRAF Setiyono, Setiyono; Azam, M.; Setiawati, Evi
BERKALA FISIKA Vol 12, No 1 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The study of influence of distance, time and color for safety lamp filter variation to radiograph has been done.  The research used blue sensitive film and green sensitive, type ­-X ray, film. The research was conducted by illuminating film with safety lamp red, yellow, green and blue color filter. The type of filter was red acrylic riddle and glass which was layered in red, yellow, green and blue scot light. The variation of irradiating distance between safety lamp with film was 20 cm, 30 cm, 40 cm, 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 100 cm and variation of time is 10 second, 15 second, 20 second, 25 second, 30 second, 35 second, 40 second, 45 second, 50 second, 55 second, and 60 second. Respectualy measurement of irradiating resulted used measuring densitometer instrument. The result of research give an illustration that variation of distance, variation of time and color of safety lamp filter influence the radiograph.  The greater distance caused the fog result becomes smaller.  The longer time caused the fog result becomes bigger.  To red acrylic filter, the fog that resulted exceed the tolerance limit is more than 0,2, but for glass filter that layered red scot light is not more than tolerance limit. Keyword: Radiograph, Blue sensitive film, Green sensitive film, Fog, Scot light.
Pengembangan Sistem Pengukuran Gejala Fisis Longsor Sistem Elektronik Dan Optik Widiyatmoko, Bambang; Hanto, Dwi; Puranto, Prabowo
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

Landslides are a common disaster in Indonesia so that the necessary anticipation through the monitoring of areas prone to the development of instrumentation systems disaster. Design has been done measuring the physical symptoms of landslides using optical and electronic systems. Measured physical symptoms include a shift in soil, and soil strains. Shift in the electronic ground sensors made by using linear and potensio constan current source. The result of measurement is known that this sensor can detect a shift change of 0.5 mm with a maximum shift of 250 mm. Soil strain measured using a fiber optic brag grating (FBG), which changes the transmission peak of FBG was done by using the diode laser wavelength sweeping. Fiber brag grating is an optical sensor that works according to the resonant effect of a refractive index grating lattice, where the resonant wavelength is determined by the lattice distance. From this principle it is when the lattice spacing change due to the strain and temperature changes, the peak resonant wavelength will also change. Changes in the resonant peaks are measured to determine the strain or temperature measurement. measurement Simulation showed that the relationship between strain and change in peak wavelength is linear with slope (Δλ / ΔF) 1.41 nm / kNewton. Keywords: Extensometer, linear potentiometers, fiber Brag grating, landslides, system monitoring, disaster  
VARIASI MODEL LEFT-RIGHT SYMMETRY DALAM FISIKA PARTIKEL DAN KESESUAIANNYA TERHADAP ANOMALI CHIRAL Maulana, Qidir; Satriawan, Mirza
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

It has been done variation left-right symmetry model in particle physics that depend onL R I SU(2) ⊗SU(2) ⊗U(1) gauge. With assumption leptons and quarks sector massformation is different, so we introducing new particles in quarks sector , , , L L R U D U and R D .From this idea will be examined chiral anomaly to decide are this variation model can becandidate besides standard model of particle physics.Keywords : left-right symmetry model, chiral anomaly
Simulasi Numerik Osilator Harmonis Edi Widodo, Catur
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
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Abstract

A program for explain movement the harmonis oscillator have been done with Python programming language version 4.2. Program was simulated simple harmonic oscillator and damped harmonis oscillator.Program was constuct by mean finite difference equation in object oriented programming Python. First, object simulation is simple harmonic motion consist spring and mass slides on a frictionless horizontal surface. Second, object simulation is damped harmonic motion consist spring, mass and piston. The result of simulation indicated that the frequency osilation depend with force constant of the spring and mass, and damped depend damping ratio and mass.  
DETEKSI DINI KUALITAS MINYAK GORENG DAN STUDI AWAL TINGKAT KEHALALANNYA MENGGUNAKAN POLARISASI ALAMI Eva, Yulianti; Indriyani, Y; Husna, A; Putri, N Kharisma; Murni, Sri; Amitasari, Ria; Putranto, Ari Bawono; Sugito, Heri; Firdausi, K Sofjan
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014
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Abstract

In this paper, we investigate natural light polarization for preliminary test of quality and authentication (halal) level of frying oil. Recently standard methods used are usually based on Indonesian National Standard (SNI), however all parameters are very difficult to be determined simultaneously. On the other hands even the test is time consumed, inexpensive, complicated and also preliminary treatments required, which is a major problem in era of rapid information need. One of an alternative solution is to use natural light polarization method. In the experiment, several vegetable frying oils and animal oils are used to be tested. The change of polarization angle is used to indicate the level of oil quality and its authentication. The result shows that higher polarization indicates lower oil quality relative to the others, which is in agreement to the previous study. This method is, not only, able to differentiate various edible vegetable oils, but also to distinguish edible oils and expired oils. More over, it has a prospect to indicate an authentication of oil that is a subject of a halal or not-halal case.This method is relative simply, not time consumed, conducted accurately without any previous treatments, and it provides a good prospect as a preliminary test for oil quality and its authentication. Keywords: Natural polarization, oil quality, halal or authentication level
Respon Berbagai Bentuk, Ukuran dan Bahan Elektroda Pada Pengayaan Elektrolisis Tritium dalam Sampel Air Hidayanto, Eko; Tjahaja, Poppy Intan; Arif, Idam
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Abstract

Experiments were carried out to investigate the effects of various forms, sizes and materials of electrodes in the electrolytic enrichment for the determination of tritium concentration in water sample. Electrodes were made in several forms: square plate, cylinder and spiral. The electrolytic enrichment was carried out by conducting electric current to the electrodes in electrolytic cell at 150C filled with water sample, until the water volume is reduced to 10% from the initial volume. The concentrated water were then mixed with scintillate solution, and then counted using Liquid Scintillation Counter (LSC). The results show that the appropriate electrodes is nickel square plate with the recovery fraction and the enrichment factor respectively are 73.73% and 7.373
STUDI PENGARUH UKURAN PIXEL IMAGING PLATE TERHADAP KUALITAS CITRA RADIOGRAF Sudin, Ahmas; Muhlisin, Zaenul; Widiyandari, Hendri
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015
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Abstract

This study aims is to determine the image on imaging plate which has a different pixel sizes. In this research, the X-ray apparatus and Computed Radiography (CR) which is used in the diagnostic field was used. The three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it was used. The exposure factor was adjusted at 64.5 kV and 16 mAs. The each of imaging plate were exposure three times. The results of each radiograph imaging plate were measured by using a densitometer. By measuring the Stepwedge radiograph, it was obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate were compared to obtain the imaging plate that have a higher contrast value. This research resulted that each different pixel sizes on the imaging plate would generate a different image quality. Keywords: pixel, imaging plate, image quality, contras, density
Analisis Spektrum Atomik dalam Penentuan Temperatur Eksitasi, Temperatur Elektronik dan Densitas Elektron Plasma Argon Nur, Muhammad
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of excitation temperature, electron temperature and density of electron has been done through analysis of the atomic spectrum. Atomic spectrum emitted by the argon plasma with a pressure of 1 MPa. Plasma generated in a corona glow discharge reactor. Excitation temperature (Texc) was obtained by using the Boltzmann distribution and the plasma was assumed to occur in Local Thermodynamic Equilibrium (LTE). Electronic temperature (Te) was obtained by using Saha distribution and taking the ratio between the intensity of the observed spectrum (integrated in the frequency interval) with continuous intensity was observed (not integrated). From the two temperatures, and using the Saha distribution, the density of electron/ion (Ne = Ni) can be determined. Argon plasma which was in LTE condition with a pressure of 1 MPa, Texc = 2877.70 K, Te = 21266.54 K and Ne = Ni = 4.60 x 1021 cm-3 were  obtained   Keyword: Excitation temperature, electron temperature, density of electron, atomic spectrum, corona glow discharge, Boltzmann distribution, Saha distribution, Local Thermodynamic Equilibrium
STUDI UJI ALTERNATIF KUALITAS MINYAK GORENG BERDASARKAN PERUBAHAN POLARISASI CAHAYA TERIMBAS Susan, Ade Ika; Firdausi, K Sofjan; Setiabudi, Wahyu
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
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Abstract

AbstractIn this research, we report the quality of several cooking oils before and after heating. The parameter of quality was based on electrooptics characteristic or, so called, the change ofpolarization angle induced by external electric field. In this examination, it was used threedifferent brands of cooking oils. The samples were heated in the time interval between 0-120minutes. The electrooptics characteristic was determined by measuring the change ofpolarization angle of light as it passed through the oil while it was applied by external electricfield. The field was produced by two parallel plates connected to different potential between 0-9kV. The light source was diode laser atλ = 650 nm and λ = 532 nm. The quality of oil was then determined by average polarization angle per potential difference, i.e. α ≡ Δθ/ΔV. Based on the result of observation, the fresh oil before heated has smaller change of polarization angle thanoil after heated, which is in agreement to the previous study. The longer heating time is, morefree radicals are produced, which leads to higher polarization. It shows also that the change ofpolarization depends on the wavelength.  From two diode lasers, the effective wavelength toproduce higher number free radicals is obtained by 532 nm. The increasing average ofpolarization angle is linearly to the increasing of heating time. It is obvious that the electroopticsparameter could be proposed as an alternative quality test of cooking oil.Keyword: Cooking oil quality, Change of polarization angle, electrooptics

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