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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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PEMBUATAN SOFTWARE MONITORING JUMLAH PRODUKSI KERUPUK MENGGUNAKAN BORLAND DELPHI 7.0 Adiyani C, Mirsari; Danusaputro, Hernowo
BERKALA FISIKA Vol 14, No 3 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The monitoring program for the crackers counter has been done by Borland Delphi 7.0. The results of this program is intended to help the manager’s job in monitorin the amount ofcracker produced by industry. This program using Borland Delphi 7.0. While to find out the cracker pieces which fellfrom the conveyor using photodiodes sencors and lasers as light sources directed at the sensorphotodiodes. When the sencor detected a cracker pieces which fell from the conveyor, the sensorsend a signal to the microcontroller for processing and then send to computer via serialcommunication. On computer, that data is received by Borland Delphi 7.0 program to displayedand stored in Microsoft Access. The system has been realized successfully and can printer the data stored in databases sothat the amountof crackers produced will be known.Keyword: Crackers, Borland Delphi 7.0, Microsoft Access, photodiodes sencors, lasers
Penentuan Koefisien Linier Elektro Optis Pada Aquades dan Air Suling Menggunakan Gelombang RF Jatwiyono, Lilik Eko; Sugito, Heri; Firdausi, K. Sofjan
BERKALA FISIKA Vol 10, No 4 (2007): Berkala Fisika
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Abstract

The coefficients of electrooptics for water and refinery water in RF field have been determined. The RF frequency range used in the research is 6,04 MHz to 11 MHz. Two different light beam (532 nm and 632,8 nm) have been used to measure the change of light polarization after transmitted the samples. The result indicates that the linear and quadratic electro optic coefficients appear in the range of frequency-field. The refinery water has greater value of linear electro optic coefficient than aquades. It is also obtained that the greatest change of polarization angle take place when using the green laser in the field’s position of upright against the RF frequency field and polarization angle of 900.   Keywords: RF field, polarization angle, linear electro optic coefficient.
PENENTUAN QUALITY CONTROL (QC) RESOLUSI SPASIAL PADA CITRA CT SCAN DENGAN METODE LINE SPREAD FUNCTION (LSF) DAN POINT SPREAD FUNCTION (PSF) MENGGUNAKAN PHANTOM AAPM CT PERFORMANCE Yusanti, Weirna; Budi, Wahyu Setia; Adi, Kusworo
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
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Abstract

Computed Tomography (CT scan) is one of the X-ray modalities used in radiodiagnostic, as result it needs to do Quality Control (QC). This study focused on the image quality test of CT Scan by considering the spatial resolution parameters and using calculation method of the digital image. The effect of exposure factors (voltage and electric current) was also on image quality. This study using multislice CT (MSCT) 128 slice and AAPM CT Performance Phantom. Phantom scanned with the variation of exposure factors (80, 100, 120 kV and 50, 100, 150, 200, 250, 300, 350, 400, 450, 500 mA). The determination of spatial resolution value derived from the value of Full Width at Half Maximum (FWHM) of the Line Spread Function (LSF) and Point Spread Function (PSF) graphics. Results shown that the higher voltage applied, the smaller value of FWHM which show better image quality. This method is able to detect spatial resolution up to the 5th level (hole diameter 0.75 mm), whereas it is only up to 3rd level (1.25 mm) visually. The image quality in this study has been compared with the rules of West Austr Compliance Testing Protocol 2006, and it is proved that the  image quality is still good, thus the CT Scanner is still feasible to  use. Key words: CT Scan, Spatial Resolution, Line Spread Function, Point Spread Function
Rekontruksi Citra Tomografi Sinar-X Flouresens 2D Berbasis Teknik Radiografi Digital Menggunakan Bahasa Pemrograman Matlab 7.1 M.Si, Sumariyah; Muhlisin, Zainul; Setiawati, Evi
BERKALA FISIKA Vol 13, No 4 (2010): Berkala Fisika
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Abstract

This research has been done Recontructing of  2D X-ray Flouresense Tomographic Imaging Basis on Digital Radiograhy Technique using MATLAB 7.1 Programming  The research uses an unit Computed Radiografi, a rotated obyect and a reconstruction programme imaging. The shape of rotated object is prisma which made of acrylic, lenght 18 cm and  size sisi 6 cm. The prismacan  rotate continue and as cor of the rotatd obyek uss asylinder still. Recontruction 2D tomographic imaging build from 25 rotatd object radiograf imaging result of expose Computed Radiografi with expose factor constant ang interval increasing rotated angle7,50 . The reconstruction programme 2D Tomographic  consist of the cropping programme which produces  25 slice rotatd obyect forming sinogram and the programm Transformation invers Radon. The result of 2D Tomographic reconstruction in this rsearch obtain cross-sectionalprisma imaging is circle in the triangle sisi same imaging  which habrur.           Keywords: recontruction, tomography and radiography
Rancang Bangun Alat Pengukur Densitas Optik Radiograf Sinar-X Digital Sumariyah, Sumariyah; Gunadi, Isnain; Mujib, Syaiful
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
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Abstract

A digitized X-ray radiograph’s optical density measurer has been designed.  It’s scale work is between  0.00 to  4.42. The main part of  this instrument is an optocopler sensor which will convert the light passing by  to an analog current. An optocopler circuit is a combination of LED as a light source, and a photoresistor as a light sensor. The sensor circuit is combined with a voltage devider circuit so that the voltage caused by the light and the output is work reversely. Besides, it combined with an instrumentation amplifier which amplifies the output voltage of the whole sensor. A decoder then added to the circuit to translate the BCD code to a seven segment display. The related segment, then, turned on according to the magnitude of the output voltage. The last part is a seven segment displayer which displays the measure’s result. According to a testing oxamination, the instrument is able to produce a measurement result till a resolution of 0.01.
THE ELECTRIC FIELD FORMULATIONS IN THE PLANE-KNIFE CONFIGURATIONS Yoyo Wardaya, Asep; Nur, Muhammad
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Abstract

In this paper, we calculate enormous electric field produced by the plane-knife configuration of the plasma generator. The value of electric field is calculated by two ways of configurations, the first is the almost perpendicular form of the Capasitor plates and second the perpendicular one. The result of calculation is the plates perpendicular form will produce higher electric fields than the almost perpendicular case. Key words : Plasma generator,  plane-knife configuration , electric field.
Disain Peredam Suara Berbahan Dasar Sabut Kelapa dan Pengukuran Koefisien Penyerapan Bunyinya Khuriati, Ainie; Komaruddin, Eko; Nur, Muhammad
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
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Abstract

research aims to determine sound absorption of absorber materials making from coconut coir composites. Absorber material have been made with different composition from coconut coir composites.             Twelve samples have been made. One of samples is natural coconut coir and the other are made from coco fiber and coco peat with certain compositions. From 12 samples, 10 samples have been tested. Absorption coefficients was measured by impedance tube method with ASTM E-1050:1990 standardization.              The experiment results show that coconut coir is up to standard for absorber material according to ISO 11654 , that is with weigthed absorption (aw) over 0,15.  Weigthed absorption of samples are, A:0,30; B:0,44;C:0,27;D:0,44; E:0,51; F:0,44; G :0,47; H:0,49; I:0,31;J:0,41.  So samples A,B,D,E,F,G,H,I and J can be classified in class-D while sample C in class-E.   Absorber materials that have been made are also compatible with marketed products.  The best composition for absorber was mixture of coco dust and coco fiber.  Improving amount of coco fiber improve maximum absorption.  Adding air cavity between samples and wall improve absorption.  Improving mass density of sample making with similar total mass of composition and similar glue improve absorption in low frequency.   Keyword: coconut coir, coco fiber, coco peat, sound absorber, impedance tube, absorption coefficient, pore.
PENGARUH ARUS TABUNG TERHADAP NOISE DAN KONTRAS CITRA PADA PESAWAT CT SCAN Riyanto, Slamet; Budi, Wahyu Setia; Anam, Choirul
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
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Abstract

This study aims to evaluate the effect of tube current on noise and low contrast resolution in CT scan images. Determination of the noise and the low contrast resolution was carried out using the built-in phantom of CT scan. To determine the noise, a phantom section consisting of homogeneous water (water filled phantom) was used, and to determine the low contrast resolution, a phantom section consisting of a polystyrene box was used. The images were taken in an axial mode, using a voltage of 120 kVp, rotation time of 2 seconds, beam collimation of 10x2.5 mm, and slice thickness of 7 mm. The tube current was varied from 80 mA to 200 mA. At each scanning, 3 (three) slices were taken. The results show that an increase of the tube current from 80 mA to 200 mA causes a decrease in THE noise, but does not affect TO the low contrast resolution. At the same low contrast resolution, an increase of the noise decreases object detectability.Keywords: tube current, image noise, low contras resolution, axial scanning, CT scan
Review Studi Difraksi Fresnel Menggunakan Celah Bentuk Lingkaran Rosyidah, Arinar; Marhaendrajaya, Indras; Firduasi, K. Sofjan
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
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Abstract

The Fresnel Diffraction has been reviewed to measure the wavelenght of monochromatic light sources. The change of circle fringe’s number is obtained by the change of the distance between source and slits, and the change of fringe’s radius. We used here the diode green pointer laser and red pointer laser as light sources with 1 mW in power. From the measurement, we obtained that the wavelenght of green laser and red pointer laser are still in the range of literature values. Key words: Fresnel diffraction, Fresnel zone.
UPAYA PENINGKATAN KUALITAS CITRA MRI DENGAN PEMBERIAN MEDIA KONTRAS Suhardi Suhardi; Wahyu Setiabudi; Choirul Anam
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
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Abstract

Improvement the image quality of magnetic resonance imaging (MRI) carried out bycontrast media has been done. It was expected to obtain a better image quality so thatinterpretation of MRI images more valid. Contrast media were used gadolinium 5 mmol/10 ml perpatient. Number of patients 10 people with tumor of the head, and each uses a 6 slices. MRI usedAIRIS II with 0.3 Tesla magnetic field, Kodak Dry View 8900, densitometry, and Film. In thisstudy, the image resulted with and without contrast media were measured its density andcompared. It was resulted that the image density in normal  tissues no change, with and withoutcontrast media. While the tumor area with and without contrast media, the density decreased byan average of 0,56. The addition of contrast media, the presence of tumor will appear moreclearly.Keywords: Contrast Media, gadolinium, MRI

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