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
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
 8   9   10   11   12 
ANALISA MODEL KECEPATAN DENGAN PRE STACK DEPTH MIGRATION PADA LAPANGAN ‘X’ Dimas Sidiq Baskoro; Agus Setyawan; Bambang Mujihardi
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (684.638 KB)

Abstract

Analysis on Pre - Stack Depth Migration ( PSDM ) has been applied in the data field " X " on line 11 and 48.  Pre - Stack Time Migration ( PSTM ) often get  discontinuity of reflector caused by lateral velocity variations and complex geological structure . It can be overcome by processing the data using an accurate velocity model . Pre- Stack Depth Migration has done by using the velocity model obtained from a tomography velocity models that reflect the actual state of the earth . PSDM able to show better results compared with the results of PSTM , which is able to confirm the continuity of reflectors and more coherent resolution. Keyword:  PSDM, PSTM, lateral velocity variation
ANALISIS NOISE LEVEL HASIL CITRA CT SCAN PADA TEGANGAN TABUNG 120 kV DAN 135 kV DENGAN VARIASI KETEBALAN IRISAN (SLICE THICKNESS) Ayu Adriyuni Lestari; Heri Sutanto; Zaenal Arifin
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (655.45 KB)

Abstract

Some of the parameters that influence noise level are tube voltage and slice thickness, that can affect image quality and accuracy in diagnosis, with a tolerance limit of the CT number ± 7 HU. The objective of this study is to define the noise level on the tube voltage 0f 120 kV and 135 kV with slice thickness variations. The measurement used water phantom scanning of head with tube voltage 120 kV, 135 kV and slice thickness 2, 3, 5, 7 and 10 mm. water phantom scanning of the abdomen with tube voltage 120 kV and slice thickness 3, 5, 7, 10 and 20 mm. Noise level got from central ROI area phantom. The high tube voltage and increasing the slice thickness, that the noise level decreases because the x-ray tube produced high x-rays energy and high photons penetrating to tissues. Noise levels are good when using eksposure parameters are current-time and tube voltage : 225 mAs, 135 kV with a slice thickness of 10 mm is 0.47 % for the head and 375 mAs, 120 kV with a slice thickness 3 mm is 0.45 % for the abdomen.Keywords: Noise, Slice thickness,Phantom, CT number
ANALISIS PERHITUNGAN DOSIS SERAP TERAPI ROTASI DENGAN METODE TISSUE PHANTOM RATIO (TPR) PADA LINEAR ACCELERATOR (LINAC) 6 MV Ifa Istighfaroh; Evi Setiawati; Zaenal Arifin; Sanggam Ramantisan
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.552 KB)

Abstract

This Research has been conducted for the absorbed dose calculation in rotational treatment with Tissue Phantom Ratio (TPR) method. The purpose of this study to determine the absorbed dose comparisons on rotational therapy based on calculations and measurements. The study was conducted in a solid water phantom with 100 cm SAD. The study was conducted on a square field area of 5 cm x 5 cm, 7 cm x 7 cm and 10 cm x 10 cm as well as on equivalent field area of 10 cm x 10 cm, consist of 8 cm x 13,3 cm and 9 cm x 11,5 cm area. The result is percentage of difference between the value of measurements and calculations dose on each field area. The field area which have percentage below the tolerance value is a 7 cm x 7 cm with the percentage of difference of 0.46%. For the field area of 5 cm x 5 cm has a percentage of difference of 2.65%, while the area of 10 cm x 10 cm and equivalent field area the percentage of difference were high at more than 3%.
UJI RESOLUSI SPASIAL PADA PERANGKAT LUNAK COMPUTED RADIOGRAPHY MENGGUNAKAN PENGOLAHAN CITRA DIGITAL Hilmi Trian Setyawan; Suryono Suryono
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (144.366 KB)

Abstract

This research conducted the spatial resolution of images in computed radiography using digital imagery. Spatial resolution testing aims to calculate the value of spatial resolution of computed radiography. The spatial resolution of images is useful to show the images of an object that is very useful for the smallest uphold the radiography diagnosis. The method used stars from doing expose on TOR CDR phantom with tube voltage variations, 70 kV, 72 kV, 74 kV, 76 kV, 78 kV, 80 kV, and 82 kV, read on computed radiography, the images is transferred to the computer software and then make a matlab program to calculate the spatial resolution of the image then performed to analysis. The results obtained images on the 70 kV has an average value of spatial resolution of 0,095 mm/pixel. This value is within the specified tolerance limit AAPM number 93 of 2006 which is less than 0,2 or 0,1 mm/pixel. Of spatial resolution values are not influence by tube voltage variation.Keywords: Spatial resolution, Phanthom TOR CDR, Matlab
Karakterisasi reaktor plasma berarus positif dengan konfigurasi elektroda multi garis-bidang Sholehah Aisyah; Muhlisin Zaenul; Arianto Fajar
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (207.169 KB)

Abstract

Plasma technology is the most widely researched technology. Research on various types of plasma reactors began much done in order to obtain plasma which has high homogeneity. This study aims to obtain plasma discharge characteristic I-V relations in the plasma reactor wire-plate electrode configuration. This study uses nine electrodes wire with a length of 12 cm and a diameter of 0.38 mm as the positive electrode and PCB as a negative electrode plates. Characterization of plasma corona wire-plate is done by adjusting the distance between the electrodes of 1.8 cm, 2.1 cm, 2.4 cm, 2.7 cm, 3.0 cm, 3.3 cm, 3.6 cm, 3.9 cm, 4.2 cm, and 4.5 cm. The results showed that the current increases with the applied voltage and inversely proportional to the distance between the electrodes. In the future this method it is possible to be applied on an industrial scale.Keywords: Plasma corona, plasma corona wire-plate
Penentuan Nilai Resolusi Spasial Pada Citra Ultrasonik Metode Time of Flight Menggunakan Fungsi Sebaran Titik (Point Spread Function) Wahyu Fredi Santoso; Suryono Suryono
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrsct Ultrasonic wave have been familiarly applicable in many fields, imaging system is one of example. Spatial resolution value from obtained image plays important role in imaging system, therefore it could defining smallest object which detectable by its imaging system. On the research of determining spatial resolution is done using point spread function (PSF). Ultrasonic wave imaging system which have been conducted consist of transmitter and receiver series, mechanic activator, microcontroller series and also interfaces application and time of flight splitter. Transmitter series is uses to obtaining ultrasonic wave by vibrating high voltage ultrasonic transducer. Receiver series is used to receiving reflection wave from the object before it used as interruption logical at microcontroller counter. Mechanic activator required to activates ultrasonic transducer. In the other side, microcontroller series also used as transmitter and receiver series and mechanic activator controller, time of flight splitter and timer, and also to doing serial communication with the computer. Interface application and Time of Flight splitter used to doing Time of Flight data acquisition from microcontroller. Image spatial resolution defines by fitting edge spread (ESF) function data. Afterwards, defining line spread function (LSF) value which obtained by first differential from edge spread function (ESF). Spatial resolution defining process ends by fitting line spread function then full width at half maximum (FWHM) value could be obtained. FWHM is the spatial resolution value of obtained image from imaging system. The result shows image spatial resolution value which obtained from ultrasonic wave imaging system is 0,35cm with standard deviation 0,03cm. Keyword: point spread function, spatial resolution, Time of Flight, full width at half maximum (FWHM).
KAJIAN SIFAT STRUKTUR KRISTAL PADA BAHAN BARIUM HEKSAFERIT YANG DITAMBAH VARIASI Fe2O3 MENGGUNAKAN ANALISIS RIETVELD Kilat Permana Putra; Priyono Priyono
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (426.759 KB)

Abstract

Barium M - heksaferit known as permanent magnet material which has high competition against other classes of permanent magnet due to the manufacturing process is relatively simple, and has a high stability against heat and the external magnetic field besides having a high economic value. Problems encountered in the synthesis using stoichiometric composition was obtained despite the presence of a second phase in the composition of the minor.In this study the magnetic material synthesized using a non - stoichiometric composition by adding the compound Fe2O3 and conducted in-depth analysis on the initial temperature of formation at 950 0C, while the standard sample stoichiometric performed at a temperature of 1200 0C are entirely processed by powder metallurgy method using basic compound BaCO3 and Fe2O3 . Characterized using XRD to determine the crystal structure formed by the anode source Co which has a wavelength of 1.7889 Å on step scan 0,020. The results of XRD characterization followed by matching with international data ICDD - JCPDS then applied rietveld analysis using GSAS software.              XRD characterization results showed the sample with stoichiometric composition of the Barium M-Hexaferrite (BaFe12O19) as main phase and a little Fe2O3 as a minor phase. With increasing 10% Fe the initial formation is dominated by BaFe2O4 intermediate phase at 950 0C.  While the addition of 20% Fe is dominated by Fe2O3 phase.Rietveld analysis results for the material stoichiometric phase obtained better match value than both of samples while the best linearity was obtained at 20% Fe addition. Keywords: Powder Metalurgi, Barium Hexaferrite, XRD, Rietveld.
ANALISIS PERSEBARAN ZONA RESERVOIR LAPANGAN DT-1 MENGGUNAKAN METODE INVERSI IMPEDANSI AKUSTIK DAN ATRIBUT VARIANSI Tyas Vicri Hijria; Hernowo Danusaputro
Youngster Physics Journal Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.002 KB)

Abstract

Has analyzed the distribution of reservoir zone at DT-1 field using accoustic impedance inversion and attribute of variance was performed to analyze the reservoir zone based on the porosity values and the attribute variance values at DT-1 field. Porosity values obtained from acoustic impedance inversion are transformed into the porosity value by leveraging relationships porosity and acoustic impedance values are inversely proportional. While the value of variance will provide information discontinuity seismic trace where this indicates a fault, stocky, and others to support the prospect reservoir zone. From this research showed that the porosity value and the value of variance in the bottom zone of the well DT-1 proved enough lies depth in the tight layer below the reservoir zone wells DT-1. In addition to the time between Mantawa horizon (target formation) with Base horizon showed good results in demonstrating the value of variance and porosity values of mutual support prospects zone of finding a new reservoir that is the northern region stretches eastward field DT-1. Zone prospect obtained reservoir porosity of 20% - 25% with variance value above 0.1 and acoustic impedance values 24000-28000 ((ft / s) * (g / cc)). 
INTERPRETASI BAWAH PERMUKAAN DAERAH SUMBER AIR PANAS DIWAK-DEREKAN BERDASARKAN DATA MAGNETIK Muhammad Ulin Nuha ABA; Tony Yulianto; Udi Harmoko
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (705.903 KB)

Abstract

Research has been carried out using a magnetic method that aims to interpret the subsurface structure of the area hot springs Derekan - Diwak based on the total magnetic field anomaly data. It also aims to investigate the geothermal system in the area.Some 99 points measurement areas were measured using PPM (Proton Precession Magnetometer) geometrics type GSM19T models to get the value of the total magnetic field and two points as a base station simultaneously measured using the PPM G856X models. Measurement data is processed by the daily variation correction and IGRF (International Geomagnetic Reference Field) correction. The data has been used to create a contour corrected total magnetic field anomalies and subsurface cross sections involving the upward continuation and reduction to the poles.The results of study showed the total magnetic field anomaly closure pair of positive and negative closure indicate a fault zone below the surface. Interpretation is strengthened by the results of the modeling showed two faults of Derekan - Diwak areas trending southwest- northeast. This fault zone is a media outlet fluid to the surface in the area of geothermal systems.Keywords: geothermal, fault, and total magnetic field
PENENTUAN WAKTU PARO BIOLOGI TC99M MDP PADA PEMERIKSAAN BONE SCANNING Titi Purwati; Wahyu Setiabudi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.783 KB)

Abstract

Nuclear medicine is a branch of medical science to know the anatomy and physiology of the body. One type of nuclear medicine examination is the examination of bone scanning. According to UNSCEAR (United Nations Scientific Committee on the Effects of Atomic), examination of bone scanning is a type of diagnostic examination which has the largest contribution. Examination of bone scanning using a radiopharmaceutical activity is very high around 320-740 MBq. Because the activity of a given patient is very high, it is necessary to note a half-life in bone biology for radiation protection purposes. Has conducted research on 35 patients in the examination bone scanning to determine the biological half time and the correlation between activity and biological half time. Radioisotopes are used in this examination is Tc99m with farmaka MDP kit (Methylene Diphosponat) with a half-life of 6.03 hours. On examination, the MDP Tc99m radiopharmaceutical is injected intravenously into the patient's arm as much as 15-20 mCi. Furthermore, patients will wait for ± 3 hours and after the enumeration for 10 minutes. Imaging results obtained from the average of the beginning of 627493360 Bq activity and activity after 3 hours of 15290043.495 Bq. Then from the calculation of activity against time t obtained decay constant is effective with an average of 0.271 h1, the mean decay constants of physics-1 and the average 0,115 hours of biological decay constant of 0.156 h-1. The decay obtained from biological half time with an average of 4.434 hours. In this study also found a correlation between the activity after 3 hours with a half-life of -0.94 biology, because the correlation value close to -1 (negative one) then the relationship of these variables have a strong negative correlation. 

Page 10 of 29 | Total Record : 282

 8   9   10   11   12 

Filter by Year

2012 2018


Reset
Filter By Issues
All Issue Vol 7, No 2 (2018): Youngster Physics Journal April 2018 Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018 Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017 Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017 Vol 6, No 2 (2017): Youngster Physics Journal April 2017 Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017 Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016 Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016 Vol 5, No 2 (2016): Youngster Physics Journal April 2016 Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016 Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015 Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015 Vol 4, No 2 (2015): Youngster Physics Journal April 2015 Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015 Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014 Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014 Vol 3, No 2 (2014): Youngster Physics Journal April 2014 Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014 Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013 Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013 Vol 2, No 2 (2013): Youngster Physics Journal April 2013 Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012 More Issue