cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
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 7 Documents
 1 
Search results for , issue "Vol 16, No 4 (2013): Berkala Fisika" : 7 Documents clear
KORELASI NILAI TIME REPETITION (TR) DAN TIME ECHO (TE) TERHADAP SIGNAL TO NOISE RATIO (SNR) PADA CITRA MRI Aji Prastowo, Alan Tanjung; Setiabudi, Wahyu; Anam, Choirul
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.424 KB)

Abstract

Effort to obtain a correlation of TR and TE to the value of Signal to Noise Ratio (SNR) in MRI machine has been carried out. In this research used MRI Hitachi Airis II which has a permanentmagnetic field of 0.3 Tesla. Research using a phantom object with Polyethylene Vessel containingNiCl2: 18 mmol/l. Phantom has a tube diameter 165 mm, cap diameter 120 cm and height 320 mm.Image acquisition is done with two TE value of 20 ms and 120 ms, and TR values varied from 100 msto 4000 ms, with the scale of 100 ms. Slice taken with a thickness 5 mm, and in the position 15 cm fromthe bottom of phantom. Region of interest (ROI) in the image is determined at the radius of 65 cm.SNR calculation is then performed for a variety of TE and TR. It was obtained that the SNR valueincreases exponentially for TR value of 100 ms to 700 ms and stabilized at the next TR to 4000 ms. Atthe same TR, SNR value at TE 20 ms greater than the TE 120 ms. At TE 20 ms, TR optimal value forT1WI is at 700 ms, with a SNR value of 57,6 ms, whereas for PD image on TR 3900 ms with a SNR of57,6. At TE 120 ms, TR optimal value for T2WI was at 2200 ms with SNR value of 19.Keywords: Magnetic Resonance Imaging (MRI), Time Repetition (TR), Time Echo (TE), Signal toNoise Ratio (SNR)
SISTEM AKUISIS DATA KOMPUTER PADA SENSOR ULTRASONIC RANGER UNTUK PENGUKURAN LEVEL MUKA AIR Suryono, Suryono; Surarso, Bayu; Saputra, Ragil
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.501 KB)

Abstract

This paper describes the method of ultrasound ranger development, data acquisition system and its characteristic than applied for automation water level distance measurement system using personal computer. This system is very important for recorded of water level data acquisition inlong time so data communication at measurement system.The system consist of ultrasonic distance sensor, microcontroller for time-of-flight counter and   serial interface,  and computer system fordata acquisition system. The microcontroller drive of sensor for generate of burst pulse. The 16-bitof counter of  microcontroller  was used for time-of-flight counter. Data was transmitted tocomputer twice at 8-bit of counter register. The microcontroller transmitted data at 9600 BPSusing UART protocols and slave-master for serial communication system. The communicationsystem was connected at voltage level communication RS232. The computer application of dataacquisition system was connected at COM port using Cport pellete in Borland Delphi. Thecollected data calibrated using standard.  The result of system characterization  have highmeasurement stability system at 99,61%, range of measurement distance at 10 cm to 280 cm,linear correlation with standard measurement at R = 0,9999, so it good for more application.Keywords : distance, pulse, counter, serial communication
RANCANG BANGUN ALAT UKUR KEKERUHAN AIR BERBASIS MIKROKONTROLER Eka Nuzula, Nike; Endarko, Endarko
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.158 KB)

Abstract

Turbidity meter based on microcontroller has succesfully been designed and fabricated. The photodiode as sensor and a LED as light source were used for measuring level of waterturbidity whereas microcontroller ATMega 8535 was used for data processing. The turbidity levelof water is measured based on Nephelometer method. The LED and photodiode detector were positioned parallel to each other at a distance of 2 inches. The measurement results indicated that the turbidity meter could be used to measure the turbidity level of water in the range 0 – 200 NTUand the maximum of standard deviation was at 1.33 NTU.Keywords : Turbidity, NTU, Photodiod, LED, Nephelometer
Berkala Fisika Vol. 16 No. 4 Tahun 2013 Berkala Fisika, Tim Redaksi
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (66.308 KB)

Abstract

Berkala Fisika Vol. 16 No. 4 Tahun 2013
PEMBUATAN LAPISAN FOTOKATALIS ZINC OXIDE (ZnO) DENGAN TEKNIK SPRAY COATING DAN APLIKASINYA PADA PENGERING JAGUNG Hidayanto, Eko; Sutanto, Heri; Firdausi, K Sofjan; Arifin, Zaenal
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.407 KB)

Abstract

ZnO thin film has been deposited on the glass with a spray coating technique. Gel of ZnO 0.5 M was synthesized by dissolving 0.5 M zinc acetate dehydrate in isopropanol andmonoethanolamine solution at room temperature with the molar ratio of MEA and ZnAc is 1:1. The solution was stirred using a magnetic stirrer at 70°C for 30 minutes to get the clear and homogeneous ZnO gel. ZnO gel is placed on the spray hole and sprayed on a heated glasssubstrate till 40oC. Then, the spraying layer spraying was allowed to stand for 3 days tostrengthen the contact with glass layer. Deposition results of ZnO layer is transparent withtransmittance values of 71.4 % and decreases with a decrease in wavelength imposed on the layer.The energy dispersive X-ray (EDX) results show the composition of zinc (Zn) is less than theoxygen (O) with a ratio Zn : O = 38.44 % : 61.56 %. The scanning electron microscopy (SEM)results show ZnO thin film has a smooth and homogeneous surface with a grain size of 57 nm. Thetest results demonstrate ZnO layer has a band gap value of 3.01 eV. The drying corn shows thatdirectly drying using sunlight has a faster rate compared using ZnO glass. Surface morphology ofthe layer of dried corn using ZnO glass has brighter color and lice compared to directly drying onsunlight.Keywords: Photocatalyst, ZnO, Thin Film, Spray Coating, Corn, Drying
IDENTIFIKASI TELUR AYAM DARI INDUK MUDA DAN TUA MENGGUNAKAN SPEKTROSKOPI INFRAMERAH DEKAT Amalia, Riana; Trihandaru, Suryasatriya; Rondonuwu, Ferdy S
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (181.181 KB)

Abstract

One important factor in the hatching chicken eggs industry is hatchability of  the eggs. Conventionally, hatchability of the eggs is determined by the age of the hen. It is estimated thateggs which have high hatchability will produced from the hen which is aged between 25 to 55weeks. However, the age of the eggs hen is difficult to recognize from the egg itself, in particular ifthe identification needs to be done quickly and involving eggs in large quantities. This paperreports the identification of chicken egg from young and old hen using Near Infrared Spectroscopy(NIRS), followed by Principal Component Analysis (PCA). A total of 120 eggs with the amount of 60 eggs  that was taken from young hen (aged around 26 weeks) and the remaining 60 eggs thatwas taken from  old hen (aged arround 66 weeks) can be clearly distinguished by clusteringthrough PC1-PC2 diagram. Thus, this method can be used to identify  chicken eggs based on agehen.Keywords : Chicken Eggs, NIRS, PCA.
PEMBUATAN KURVA ISODOSIS 2D DENGAN MENGGUNAKAN KURVA PERCENTAGE DEPTH DOSE (PDD) DAN PROFIL DOSIS DENGAN VARIASI KEDALAMAN UNTUK TREATMENT PLANNING SYSTEM Nurul Ihya, Farhatin; Anam, Choirul; Gunawan, Vincensius
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (529.432 KB)

Abstract

Treatment Planning System (TPS) is very necessary in radiotherapy planning to give the accurate radiation dose given to the patient.  In the TPS, 2D isodose curve is used to determine thedose distribution with the same rate at a certain distance from the radiation source.  The isodosecurve is obtained from the Percentage Depth Dose (PDD) and dose profile.  Measurement data ofPDD and dose profiles obtained from Kensaras Hospital in Semarang.  The PDD and dose profiledata were obtained from testing the water phantom for soft tissues such as muscles or other bodytissues.  Dose profile curve which is used  is at a various depth, such as: 1.5 cm, 5 cm, 10 cm, 15cm, 20 cm and 25 cm with an area of 5 x 5 cm2field, 10 x 10 cm2, 15 x 15 cm2, 20 x 20 cm, 30 x 30cm2 and 40 x 40 cm2.  At each depth of curve profile, the dose at the surface is calculated  andnormalized using  interpolation and normalized by narrowing techniques. 2D isodose curveobtained from the weighting technique to the calculation of the dose profile curve. In the field sizeof 5 x 5 cm2 and 10 x 10 cm2, isodose curve formed better in the absence of horn at the edge of thecurve.  In the field size larger than 10 x 10 cm2 there are horns on the edge of the curve at thelower depths.Keywords : Treatment Planning System (TPS),  2D Isodose curve, Percentage Depth Dose (PDD),Dose profile.

Page 1 of 1 | Total Record : 7

 1 

Filter by Year

2013 2013


Reset
Filter By Issues
All Issue Vol 28, No 2 (2025): Berkala Fisika Vol 28, No 1 (2025): Berkala Fisika Vol 27, No 2 (2024): Berkala Fisika Vol 27, No 1 (2024): Berkala Fisika Vol 26, No 2 (2023): Berkala Fisika Vol 26, No 1 (2023): Berkala Fisika Vol 25, No 4 (2022): Berkala Fisika Vol 25, No 2 (2022): Berkala Fisika Vol 24, No 4 (2021): Berkala Fisika Vol 24, No 3 (2021): Berkala Fisika Vol 24, No 1 (2021): Berkala Fisika Vol 23, No 4 (2020): Berkala Fisika Vol 23, No 3 (2020): Berkala Fisika Vol 23, No 2 (2020): Berkala Fisika Vol 23, No 1 (2020): Berkala Fisika Vol 22, No 4 (2019): Berkala Fisika Vol. 22 No. 4 Tahun 2019 Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019 Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019 Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014 Vol 16, No 4 (2013): Berkala Fisika Vol 16, No 3 (2013): Berkala Fisika Vol 16, No 2 (2013): Berkala Fisika Vol 16, No 1 (2013): Berkala Fisika Vol 15, No 4 (2012): Berkala Fisika Vol 15, No 3 (2012): Berkala Fisika Vol 15, No 2 (2012): Berkala Fisika Vol 15, No 1 (2012): Berkala Fisika Vol 11, No 2 (2008): Berkala Fisika Vol 14, No 4 (2011): Berkala Fisika Vol 14, No 3 (2011): Berkala Fisika Vol 14, No 2 (2011): Berkala Fisika Vol 14, No 1 (2011): Berkala Fisika Vol 13, No 4 (2010): Berkala Fisika Vol 13, No 3 (2010): Berkala Fisika Vol 13, No 2 (2010): Berkala Fisika Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus Vol 13, No 1 (2010): Berkala Fisika Vol 12, No 4 (2009): Berkala Fisika Vol 12, No 3 (2009): Berkala Fisika Vol 12, No 2 (2009): Berkala Fisika Vol 12, No 1 (2009): Berkala Fisika Vol 11, No 4 (2008): Berkala Fisika Vol 11, No 3 (2008): Berkala Fisika Vol 11, No 1 (2008): Berkala Fisika Vol 10, No 4 (2007): Berkala Fisika Vol 10, No 3 (2007): Berkala Fisika Vol 10, No 2 (2007): Berkala Fisika Vol 10, No 1 (2007): Berkala Fisika Vol 9, No 4 (2006): Berkala Fisika Vol 9, No 3 (2006): Berkala Fisika Vol 9, No 2 (2006): Berkala Fisika Vol 9, No 1 (2006): Berkala Fisika More Issue