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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 9 Documents
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Search results for , issue "Vol 4, No 2 (2015): Youngster Physics Journal April 2015" : 9 Documents clear
PENGARUH PENGGUNAAN ATURAN SISTEM POIN PADA VARIASI TEGANGAN TABUNG TERHADAP NILAI DENSITAS RADIOGRAF FOTO THORAX Basuki Budi Raharjo; Heri Sutanto
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTThe research had been done to determine the influence of system point rules to tube voltage variation in chest x-ray density. The purpose of this study to determine the value of the tube voltage that produces minimal density and maximum contrast on photos ribs, as well as tube voltage value that produces the maximum density and maximum contrast in the photo the lungs. This research is an experimental research with analytical studies. Data were collected by means of chest x-ray procedures, with settings of 60 - 150 kV, in accordance point system tables. Furthermore, from the radiograph eleven density measurement in the mediastinum, lungs, ribs, heart, and diaphragm. ribs contrast is obtained by calculating the difference in the density of  ribs and  lung density, while the contrast obtained by calculating the difference in the lungs and heart density. The results showed that, minimum density, and maximum ribs contrast obtained on the tube voltage of 60 kV, while the maximum density and maximum lungs contrast, obtained at a tube voltage of 150 kV.Top of Form Keywords: point system, tube voltage, density, contrast
ANALISA INVERSI ACOUSTIC IMPEDANCE (AI) UNTUK KARAKTERISASI RESERVOIR KARBONAT PADA LAPANGAN “X” FORMASI PARIGI CEKUNGAN JAWA BARAT UTARA Luxy Rizal Fathoni; Udi Harmoko; Hernowo Danusaputro
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Acoustic Impedance (AI) inversion method has been applied to describe characterization of carbonate reservoir in the field “X” North West Java Basin. The aim of this research is to determine the distribution of hydrocarbon prospect area that based on AI value and porosity value parameters. The used of Acoustic Impedance (AI) inversion methods is model based methods. The of model-based method is consist of geologic model construction then we compare to the real seismic data. Then by assume linear relationship between AI log and porosity log, and we have a linear equation that used to obtain the porosity distribution from AI distribution. Inversion result shows porous limestone distribution which has porosity range value about 0,21 – 0,23 fraction and acoustic impedance range value about 6800 – 8000 gr/cc.m/s with the directional distribution northwest – southeast. Keywords: Acoustic Impedance, Limestone, Porosity, Model-based method
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

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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.
PENENTUAN TINGKAT BUTA WARNA DENGAN METODE SEGMENTASI RUANG WARNA FUZZY DAN RULE-BASED FORWARD CHAINING PADA CITRA ISHIHARA Nur Hamid; Kusworo Adi
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Color blindness is a condition in which a person can not distinguish certain wave light that can be distinguished by the normal eyes. Tests are currently being used (Ishihara Test and the Farnsworth Munsell) are simple. But, both of them have weakness in the form of test media used and requires appropriate room.       In this study, applies image processing to the development of color blindness level determination. Image processing is done by segmenting the pattern first with fuzzy color space segmentation. Having obtained the pattern of Ishihara image is used, then recombined with the initial image, so that the image obtained Ishihara with a segmented pattern. If the patient is able to see the pattern which is purposed, then continued to another image. However, if the patient can not see the pattern, then the pattern will be increased intensity of red, green and blue. By using a rule-based forward chaining, the determination of color blindness level is determined by the rules of the increase in the intensity of red, green and blue.          The research data is algorithm testing data which is created toward patients. Successful testing is done with total validation (normal patients and color deficiency) 97.8% and validation for diagnosted patients testing contained 85.7% of color deficiency. In the proposed algorithm is also used for the determination of the boundary wavelength capable of being viewed by people with color blindness.               Keywords: color blindness level, color segmentation, enhancements of color intensity
PENENTUAN INDEKS BIAS DARI KONSENTRASI SUKROSA (C12H22O11) PADA BEBERAPA SARI BUAH MENGGUNAKAN PORTABLE BRIXMETER Tiffany Rahma Novestiana; Eko Hidayanto
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

One of the determination of the quality of the juice is concentration. Concentration can determine the value of the refractive index with a refractive index with a Abbe Refractometer. This experiment was determined the value of the refractive index of branded fruit juices using Portable Brixmeter was to get correlation between refractive index and concentration and correlation between concentration and length of measurement, and quality of fruit juice using Portable Brixmeter. The research was conducted by dilution and observation of length time measurement of fruit juice concentration. Data were analized by approach linier charts for dilution, while the length of time measurement of juice concentration with quadratic approach of polynomial. The amount of sucrose liquid concentration is comparable with its refractive index. Correlation between liquid concentration of C sucrose with refractive index n in pure sucrose (ns):0,0018C+ 1,3270 for fruit juice of guava, orange, apple, and soursop respectively (nja):0,0013C+1,3336; (nje):0,0014C+1,3334; (na):0,0015C+1,3329 and (nsi):0,0014C+1,3331. According to the length measurement of the concentration, the longer of time measurement decreased the concentration value. Concentration equation contained fruit juice taste guava, orange, apple, and soursop respectively: (Cja):-0.0016t2+0.0199t+13.365; (Cje):- 0.0062t2+0.0916t+11.444; (Ca):-0.0024t2-0.0016t+12.472 and  (Csi):-0.0032t2+0.0015t+12.158. Keywords: refractive index, sucrose concentration, portable brixmeter, fruit juice.
PENENTUAN NILAI KOEFISIEN SERAPAN BAHAN PADA BESI, TEMBAGA DAN STAINLESS STEEL SEBAGAI BAHAN PERISAI RADIASI Iwan Setiyawan; Heri Sutanto; K Sofjan Firdausi
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Radiation shield is used to protect both workers and the general public from radiation. In Indonesia there are a lot of potential materials to be used as radiation shielding materials, such as iron, stainless steel and copper which these metals have a certain density and atomic number above 26. For the determination of the value of research material absorption coefficient and radiation dose on ferrous materials, stainless steel and copper as a radiation shield. The study was conducted at RS Happy land Yogyakarta using x-ray radiation source. In testing the absorption coefficient of the material in lead , iron , copper and stainless steel : The plane was set at a voltage, current and time on the conditions of 80 kV 32 mAs and 90 kV 40 mAs were fixed and the distance between the focus to the object as far as 100 cm, Multi Purpose Detector ( MPD ) was placed under the object, wide open field irradiation 5 cm x 5 cm, the center beam was placed right in the middle of the next object do exposure for each thickness of lead, iron, copper and stainless steel was done in sequence according to the thickness variation material. From the test results coefficient absorption material (µ) in iron, copper and stainless steel on condition exposure factor 80 kV 32 mAs showed μ for iron absorption coefficient of 0,76 / mm, copper of 1,16 / mm and stainless steel for 0,83 / mm. Results equality between iron, copper and stainless steel with lead to 1,3 mm thickness. Iron 8,9 mm, 5,8 mm copper and stainless steel 8,1 mm. Lead to a thickness of 2 mm, 13,7 mm iron, copper, stainless steel 8,9 mm and 12,5 mm. On condition exposure factor  90 kV 40 mAs showed μ for iron of 0,56 / mm, copper 0,92 / mm and stainless steel of 0,62 / mm. Results equality between iron , copper and stainless steel with Lead to a thickness of 2 mm, 17,5 mm iron, copper and stainless steel 10.6 mm 15,7 mm. Keywords: X - ray Unit, Multi Purpose Detector ( MPD ), Absorption Coefficient, Iron, Copper, Stainless Steel
PENENTUAN AKTIVITAS 60CO DAN 137CS PADA SAMPEL UNKNOWN DENGAN MENGGUNAKAN DETEKTOR HPGe Miftahul Aziz; Eko Hidayanto; Diah Dwiana Lestari
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The measurement of radioactivity 60Co and 137Cs in the unknown sample were conducted to determine activity value using HPGe detector. Calibration of energy, calibration efficiency, making the efficiency of the curve calibration, and validation methods are the determination of sample source activity. Calibration of energy and efficiency using standard sources QCRB 1186 and 152Eu. Enumeration carried out using two detectors with efficiencies of 25% and 35%, respectively at a distance of 17 cm and 24 cm. Efficiency curve created using the excel program. Determination of activity is carried out by chopping Co and Cs in the unknown sample at the same position as the standard source for 3600 seconds. Method validation is done by calculating the activity of standard source QCRB 1186 and 152Eu. Method validation using standard source 152Eu at a distance of 17 cm provide a bias of 1,4% - 3,6% and at a distance of 24 cm provide a bias of 0,3% - 4,6%. Determination of activity the unknown sample against reference value at a distance of 17 cm (Co 1173 keV: 16125 Bq and 16716 Bq; Co 1332 keV: 16526 Bq and 16287 Bq; Cs 662 keV: 16526 Bq and 16287 Bq) and at distance of 24 cm (Co 1173 keV: 15289 Bq and 16533 Bq; Co 1332 keV: 15477 Bq and 16481 Bq; Cs 662 keV: 37226 Bq and 38540 Bq). Keywords: Activity, 60Co, 137Cs, Calibration efficiency, Method Validation
UJI KUALITAS MINYAK GORENG KELAPA SAWIT MENGGUNAKAN METODE POLARISASI ALAMI DENGAN VARIASI LINTASAN OPTIS Tommy Andri Palembangan; K Sofjan Firdausi
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

According to Indonesian National Standards, the parameter of quality test of cooking oil consists of many aspects, accompanied by its various methods. Both the parameter and methods can't be done simultaneously. It takes a long time and quite expensive costs. Through this paper, proposed that the active optic parameter is an alternative parameter of cooking oil which experiencing some treatments.The tested sample is the palm oil, and its active optic character being measured by the change of polarization angle. The source of light which used in this experiment is a 100 watt fluorescent lamp. The sample condition divides by some parts, they are the new ones, old ones, after-used ones, and the expired ones. A place to put the sample called cuvette with the various optical track, started from 1 to 5 cm.The result of the experiment showed that the active optical properties changes linearly, depends on the length of optical path, however it's not linear with the concentration of oil. The parameter of the active optical properties is sufficient enough to show the quality of palm oil. Good quality of oil indicated by the swivel angle of the form is smaller than the oil with bad quality. This is in accordance with the validation result of Free Fatty Acid (FFA) test. In the future, this method can give accurate information and complete the parameter of quality standards which used nowadays, furthermore it's possible to applied to another form of oil. Keywords: Optical properties, the quality of palm oil, natural polarization.
KLASIFIKASI DAERAH LONGSOR BERBASIS PENGOLAHAN CITRA MENGGUNAKAN JARINGAN SYARAF TIRUAN PROPAGASI BALIK Putri Nuriskianti; Kusworo Adi; Tony Yulianto
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Landslides are natural events that occur due to the ground movement of the earth's surface. The movement influenced by its constituent such as soil type, land use and intensity of rainfall in some place that causes a material such as ground was moving. Research on landslide done based on field surveys. The potential of a region in the category of landslides can be done by mapping parameters - parameters of landslides in the form of a calculation using the image of a network system that has been trained to predict the condition of an area.Image processing is done by segmenting color for any information presented in an image of landslides parameters. The color segmentation results performed labeling process to represent the information in the image. Then the landslides indices obtained from the manual calculation of weighting parameters. The result of the calculation is used as an instructional manual for the neural network. Where the value of the index 1 is the lowest level of landslide or safety category. While the index level 5 is the highest landslide or category of highly vulnerable to landslides. To process the data from the manual calculation in artificial neural network using backpropagation algorithm.The research data was training data and testing of tissue obtained from the manual calculation of weighting parameters landslides. Network training successfully conducted with a total accuration (index normal manual landslides and landslide index network) of 100% and accuration of test results 91,2% network. In the training data used 96 samples of data and test data as much as 34 data.Keywords: Landslide index, color segmentation, artificial neural network.

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