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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.
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Articles 9 Documents
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Search results for , issue "2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014" : 9 Documents clear
Perancangan Model Pengukuran Jarak Menggunakan Computer-Aided pada Kontrol Kualitas Ultrasonografi Fallo, Frida; Adi, Kusworo; Suryono, Suryono
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

This research purposes are to do some quality tests through a distance measuring calculation using computer-aided system in a USG image projection and to analyze the distance measuring. In concerning with the design and its implementation, this research used digital tabulation method of image projection to compute and to analyze the distance measuring. The image value was established by variation of attenuation, TGC, and depth. Image tabulation was processed with ROI establishing and the cropping method. In depth variation, the average real distance of USG image resolution is 1 cm, the average value of vertical distance accuration of the image is 0.9747, thus the error value of the vertical distance accuration is 0.0253 cm or 0.253 mm or 0.253 % from the real distance and  the average value of the horizontal distance accuration of the image is 0.998 cm thus the error value of the horizontal distance accuration is 2x10-3 cm or 0.02 mm or 0.02 % from the real distance. For the variation of attenuation, the average value of vertical distance accuration of the image is 0.967 thus the error value of the vertical distance is 0.033 cm 0.33 mm or 0.33 %, and  the average value of the horizontal distance accuration of the image is 0.986 cm thus the error value of the horizontal distance is 0.014 cm 0r 0.14 mm or 0.14 %. Thus the error value for the vertical distance accuration is 0.031 cm or 0.31 mm or 0.31 % from the real distance. The result of the all tested components showed that the tested USG machine fullfiled the qualification of The American Association of Physicists in Medicine (AAPM) criteria. Keywords : USG, Quality Control, Distance Accuration, Computer-Aided
Redaksional Berkala Fisika Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Vol 17 No.1 2014
Kajian Efisiensi dan Karakterisasi Produksi Ozon dengan Lucutan Plasma Berpenghalang Dielektrik (DBDP) untuk Pengendalian Jamur dalam Beras Rachman, Dian Arif; Nur, Muhammad; Kusdiyantini, Endang
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
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Abstract

A research about the influence of ozone on fungi  which living on rice type mentik that used natrium agar (TPC methode) media has done.  The research was done at normal temperature and the outside air pressure with free air as a source of ozone. The ozone concentration of 2.91 up to 3.19 ppm was radiated on 7 differnet samples of rice, each sample 50 gram used ozonized  time variation 0 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes and 180 minutes. It was obtained results the number of fungi that died of 97,3 % after ozone irradiated for 30 minutes and 99,2% after 60 minutes. Total number of fungi which has dead during 150 minutes as much 99,9 %. Characterization of ozone conducted using ozone reactor (Dielectric Barrier Discharge Plasma). variation in the voltage and the rate of air flow was performed to obtain the optimum concentration of ozone. Voltage variation started from 6 kV, 6 kV, 8 kV and 6 kV whereas variation of oxygen flow rate of 0.5 L/min, 1 L/min, 2 L/min and 3 L/minute. The results obtained with the same tendency which is that at the same voltage, the higher the air flow rate and declining concentrations of ozone. On the study for flow rate of 0.5 L/min the ozone concentrations was obtained 4.6 up to 6.8 ppm. While for flow rate of 3 L/minute ozone concentrations was obtained 2.9 up to  4.8 ppm. Keywords: fungi, natrium agar, irradiate, reactor
Petunjuk Penulisan Berkala Fisika Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Vol 17 No.1 2014
Analisis Produksi Ozon dalam Reaktor Dielectric Barrier Discharge Plasma (DBDP) Terkait Panjang Reaktor dan Laju Alir Udara Serta Pemanfaatannya untuk Menjaga Kualitas Asam Amino Ikan Teke, Sosiawati; Nur, Muhammad; Winarni, Tri A
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
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Abstract

Characterization of the reactor Dielectric Barrier Discharge Plasma (DBDP) has performed as a generator of ozone (O3) and as sources of input air. Ozone was measured on a variation of the voltage (4-8 kV) with the speed of air flow of 0,5, 1, 1, 3, 4, 5, 6, 8 and 10 L/min. Plasma reactor was used as ozone generators with spiral-cylinder configuration. Spiral electrodes were made of copper wire diameter of 1,2 mm,  coil length 50  mm  and diameter cylindrical electrodes while 10,3 mm of cooper sheets with thickness 0,25 mm. Dielectric material used is pyrex with diameter 2 cm and 1,1  mm for its thickness. The AC voltage was used as plasma generators with frequency of 16 kHz. This Research used plasma reactor with three  length variations that are 5, 10 and 15 cm . Results showed voltage, the length reactor and air flow rate input  affects the ozone concentration.  Ozone concentration increased while increasing voltage,  the length of  reactor  and the flow rate used is small. Amino acids  quality  in short bodied mackerel (Rastrelliger sp.) fed ozone for  12 days of storage showed that ozone could maintain the quality of short bodied mackerel amino acids . Key Words: Spiral-cylinder Electrodes, Ozone Concentrations
Analisis Produksi Ozon dalam Reaktor Dielectric Barrier Discharge Plasma (DBDP): Pengaruh Impedansi Elektroda Spiral Restiwijaya, Maryam; Nur, Muhammad; Winarni, Tri A
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Analysis of spiral-cylinder DBDP reactor on atmospheric pressure was done to explain spiral electrode impedance influence on ozone production. Variation of coil number (N): 10, 20, 30, 40, and 50 coil spiral applied to the spiral electrodes. Spiral electrode made of a copper wire with 0.4 mm in diameter and the inner and outer coils of each was 20 mm and 20.4 mm. Pyrex Tubing in diameter 3 cm and a thickness of 1 mm serves as a dielectric barrier cover spiral electrode. Cylindrical electrodes made from a copper plate with a length of 13.70 cm and thickness of 0.47 mm. a High voltage of AC has been used with a voltage up to 10 kV with frequency of 16 kHz. Free air supplied into the reactor with air flow rate of 6 L/minute. The results showed that at a constant N, ozone concentration decreased with the increasing value of the impedance (Z). Reactor DBDP most effective in terms of electricity consumption is on the DL = 20 mm, DK = 0.4 mm, and the number of coil N = 10 coils of wire with a power that is as high as 177.60 Watt and  Z=3,60x105Ω. Keywords : Number of coil, Spiral-cylinder electrodes, Ozone concentrations
Analisis Keseragaman Citra pada Pesawat Ultrasonografi (USG) Sudarsih, Kesawa; Setia Budi, Wahyu; Suryono, Suryono
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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The computer base system to determine uniformity of ultrasonography image quality has been developed at various attenuation(dB) and Time Gain Compensator (TGC).The equipment used in this study was 2-dimensional ultrasonic apparatus and multi-purpose multi-tissue phantom models 040GSE. Data collection was performed by scanning the phantom using a linear transducer with a frequency of 8 MHz. The mean and standard deviation of image density of it ROI calculated used computer base system then analyzed with trendline if the image density value in the range between mean and sd  it means image uniform. The result shows that the uniformity of the image is influenced the value of attenuation and TGC. This value increase proportional with increasing attenuation. For greater value of the TGC the uniformity tends downward. At 45-60 dB  obtained distribution image uniformity sd value is 0.20 and 0.28, and at minimum up to maximum TGC  obtained distribution image uniformity sd value is 0.33 and 0.48. This value can be used for quality assurance reference of USG equipment. Keyword : USG Equipment, Uniformity, Region of Interest, Digital Image Processing
Studi Analisis Echo Train Length dalam K-Space Serta Pengaruhnya Terhadap Kualitas Citra Pembobotan T2 FSE pada MRI 1.5 T Simanjuntak, Josepa ND; Nur, Muhammad; Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
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The influence of echo train length (ETL) toward image quality of sagital lumbal on MRI using T2-weighted FSE was analyzed on 20 images from four patients. Quantitative data analysis was performed using ROI two methods: image processing method on MRI’s computer and using matlab software, then conducted the statistical test. The result of SNR from these two methods obtained the highest value of SNR at CSF tissue and the highest value of CNR at CSF-corpus tissue and CSF-medulla spinalis with ETL=16. From statistical test of SNR result directly from MRI’s computer image was obtained the significant value at corpus tissue = 0.603, CSF = 0.082, and Fat = 0.213 (P > 0,05), discus = 0.022, Medulla Spinalis (MS) = 0.010 (P < 0.05), and for CNR result of CSF-corpus tissue has significant value = 0,023, corpus-MS = 0.011 (P < 0.05). By using matlab programming method obtained significant SNR result at corpus tissue = 0.000, CSF = 0,000, Fat = 0,000, discus = 0,000, Medulla spinalis = 0,000 (P < 0,05), and for the CNR result of Dicus-corpus tissue has significant value = 0.044, Dicus-MS= 0.045 (P , 0.05). These results pointed out that ETL and T2 weighted influence the Image quality of MRI, which are the image contrast at FSE and software ability of matlab to analyze the image quality of MRI. SNR and contrast are important aspect in the process of image optimization, the higher SNR value provide the better image in giving diagnose information. Keywords : MRI, Echo train length (ETL), K-space, Fast spin echo, Contras to noise ratio, Signal to noise ratio.
Cover Berkala Fisika Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Vol 17 No.1 2014

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