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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 282 Documents
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SENSITIVITAS LARUTAN NANOPARTIKEL CeO2 TERHADAP RADIASI SINAR GAMMA TELETERAPI COBALT-60 Agus Bashori; Iis Nurhasanah; Zaenal Arifin
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Gamma rays are ionizing radiation that are useful to kill cancer cells through radiation therapy, but radiation would be dangerous if the user escapes scrutiny. In this case the required dosimeter to detect its existence. Practically daily dose allowed for radiotherapy ranges from 1.8 Gy to 2 Gy therefore needed dosimeter capable of detecting a range of doses. This study has been conducted testing sensitivity to gamma radiation to a solution of CeO2 nanoparticles, each of which is synthesized at a temperature of 400°C with a concentration of 2.5 x 10-4 g / ml. CeO2 nanoparticle solution is then analyzed using a UV-Vis spectrophotometer before and after irradiated. Gamma radiation with an energy of 1.33 MV administered at doses varying from 1 Gy to 3 Gy. The test results in the form of UV-Vis absorbance spectrum CeO2 nanoparticle solution which is used as a reference to determine changes in absorbance (ΔA) and value-G. Absorbance spectrum showed absorbance increased to dosing and a strong absorbance occurs at a wavelength of 297 nm for a solution of CeO2 nanoparticles were synthesized at a temperature of 400°C. Sensitivity solution CeO2 nanoparticles seen from the changes absrobansi and value-G. Gamma radiation dosing provide value change in absorbance of about 1.50 x 10-2 to 2.50 x 10-2 and values around 0.095 molJ-1 to 0,439 molJ-1 to a solution of CeO2 nanoparticles were synthesized at a temperature of 400°C.  These values indicate that the solution of CeO2 nanoparticles have a sensitivity to gamma radiation.
SISTEM TELEMETRI PEMANTAU GAS KARBON DIOKSIDA (CO2) MENGGUNAKAN JARINGAN WIFI Muhammad Izzuddin Shofar; Suryono Suryono
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research has developed telemetry system for CO2 gas monitoring using MG811 gas sensor with Wifi network system. Telemetry sistem is very important because CO2 is lethal gas for human. This system allows for monitoring, data acquisition and early warning from somewhere far away from the gas source. This data acquisition system using MG811 gas sensor, ATmega8535 microcontroller and I2C communication protocol for data transfer between sensor and microcontroller. Data from microcontroller is sent to Wiz6000 using serial communication protocol. Wiz6000 is a serial to wifi module. Data from wiz6000 then read by computer that connected to Wifi network belong to wiz6000 with IP and port that suited with the configuration.CO2 gas sensor is being realized with reading the sensor value via I2C communication protocol with MG811 and ATmega8535 miconcontroller. After calibration, the linier coefficeient R = 0,997 toward standar CO2 meter. Data acquisition CO2 concentration with MG811 is sent via telemetry system using Wifi network that can be accessed using computer program. The program then will show the data real-time and showed in a table, chart and save them to MySQL database. This telemetry monitoring sistem also a early warning system that give a warning when the CO2 concentration increased above the safety standard.Keyword: CO2, hazardous gases, sensor, data acquisition, telemetry
ANALISIS CITRA CT SCAN KANKER PARU BERDASARKAN CIRI TEKSTUR GRAY LEVEL CO-OCCURRENCE MATRIX DAN CIRI MORFOLOGI MENGGUNAKAN JARINGAN SYARAF TIRUAN PROPAGASI BALIK Saitem Saitem; Kuworo Adi; Catur Edi Widodo
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research about analysis of CT Scan image of lung cancer based on texture feature Gray Level Cooccurrence Matrix (GLCM) and morphological using neural network back propagation has been done. Lung cancer is cancer that general occurred in the word. In 2012, 1,8 million new cases lung cancer and 1,6 million mortality because lung cancer. The research aim to analysis CT Scan image of lung cancer based on texture feature Gray Level Co-occurrence Matrix (GLCM) and morphological using artificial neural network back propagation and calculated accuracy of testing artificial neural network back propagation. This research conducts pass through stages of segmentation, feature extraction and classfication. Texture and morphological feature extraction are obtained from the thresholding segmentation. The result of feature extraction are value contrast, correlation, energy, homogeneity and area ratio then used to input in process training and testing using neural network back propagation. Process training is conducts since 4 second with number of iteration 113 iteration. In proces training from 86 train data image, 85 image is able to classified, so acurracy of training up to 98,83% and in process testing from 57 test data, 56 test data is able to classified, so test accuracy value up to 98,24%.
PENGARUH VARIASI FAKTOR EKSPOSI (TEGANGAN TABUNG DAN ARUS WAKTU) SERTA PITCH TERHADAP COMPUTED TOMOGRAPHY DOSE INDEX (CTDI) DI UDARA MENGGUNAKAN CT DOSE PROFILER Puput Khusnaiatul; Eko Hidayanto; Zaenal Arifin; Choirul Anam
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The measurements of CTDI have been done as the method used to measure of dose in CT scans. The Measurement method is CTDI air method. Measuremeans of CTDI air using the CT dose profiler was placed in the center of the gantry rotation using tube voltage variations (80 kVp, 100 kVp, 120 kVp and 140 kVp), current time variations (100 mAs, 200 mAs, 300 mAs and 370 mAs) and pitch variations (0,75, 1, 1,25 and 1,5). The results of measurements  tube voltage variations in 370 mAs, pitch 1 and collimation 5 mm were 28,8-105 mGy, current time variations in tube voltage120 kVp, pitch 1 and collimation 5 mm were 19,7-73 mGy and Pitch variation in tube voltage 120 kVp, effective current time 370 mAseff, and collimation 5 mm were 55,9-116 mGy. The measurement results showed that greater the tube voltage, current time and pitch are used then the resulting CTDI air gets greater. The smaller tube voltage, current time and pitch are used then the resulting CTDI air gets smaller. FWHM and  geometric effisiency value of tube voltage variation were 6,2-6,37 mm and 68,40%-71,30%, current time variation were 6,17-6,27 mm and 69,5%-72,5% and pitch variation were 6,19-6,51 mm and 69,2%-71,4%. FWHM values of the three variations were larger than the width of collimation because the penumbra effect and geometric effisiency values were still within tolerance limits of 55%-75%. Keywords: CT dose profiler, CTDI air, FWHM, geometric effisiency 
Fenomena lucutan plasma dengan jarum suntik sebagai elektroda aktif pada kondisi atmosfer Irfan Handoko
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

An observation of the plasma discharge phenomenon has been observed in the atmospheric conditions with a syringe as an active electrode. This study aims to obtain the characteristics of plasma generation and discharge from plasma generated. The method used in this experiment uses a plasma reactor with a dot-zone configuration given DC voltage (HV DC). Syringes are treated as point electrodes and aluminum plates as field electrodes mounted perpendicularly. The distance between the electrodes varied 2, 4, 6 and 8 mm, the syringes used in the experiment had a length of 4 cm with a diameter of 0.6 mm. The results obtained show that the distance between electrode effect on the magnitude of the voltage to achieve arc discharges. At the smallest distance 2 mm arc discharge occurs after a given voltage exceeds 250 Volts, while the largest distance of 8 mm exceeds 1000 Volts. The visible shape when the syringe is given positive or negative polarity from a purple incandescent light source at the needle tip with a measured current of 35-150 μA. After reaching the arc measurable current measured 1-4 mA, on the positive polarity of the discharge in the form of flashes of lightning connecting the distance between the electrodes and the increase of flash currents are also more and more, while when given the negative polarity of arc discharge in the form of flash of lightning but with increasing arc discharge current look like Mini sun. This happens because the temperature at the time of the syringe is treated as a larger cathode because the ion particles that strike the cathode are very radical to erode syringes such as NO +, O +, N + and are highly reactive. Keywords: arc discharge, point to plane reactor, syringe, point electrode, mini sun.
INVERSI IMPEDANSI ELASTIK UNTUK ESTIMASI KANDUNGAN RESERVOIR BATUPASIR LAPANGAN “Ve” FORMASI CIBULAKAN CEKUNGAN JAWA BARAT UTARA Veratania Aisyah; Udi Harmoko
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

An Elastic Impedance inversion has been done for determine sandstone reservoir characterization of “Ve” Field Cibulakan Formation Northwest Java Basin. Amplitude Variation with Offset (AVO) inversion is done for determining Elastic Impedance reflectivity, near angle stack, mid angle stack, and far angle stack. Moreover Elastic Impedance inversion is done for determining Elastic Impedance volume. With DST 5 horizon for obtaining structure and slicing map to determine separating lithology of sandstone reservoir. In this research used seismic data and well data which only have a well. The step of data processing by analizing well data in order to get sensitive angle in separating lithology of sandstone and shale. Mudrock Line equation is used for this research because the available of log Vs can not reach the research target zone. Well seismic tie is done for obtaining horizon that approach the real geological zone. Initial model is made by used a control well and DST 5 horizon. From three inversion has been done Bandlimited, Sparse Spike, and Model Based inversion, Sparse Spike inversion is inversion method which gives accurate result. From that result of inversion volume is used for making slicing map intent on knowing of sandstone lithology separated. Based on analysis of Elastic Impedance inversion that content estimation of sandstone reservoir be in layer which have impedance 1348 (m/s)2gr/cc – 1365 (m/s)2gr/cc. Crossplot analysis result between log Elastic Impedance and log Gamma Ray shows that angle 350 is the best angle parameter in separating lithology of sandstone and shale. And from slicing map analysis on DST 5 horizon shows that zone distribution of sandstone reservoir have oriented north untill northeast.   Keyword: Elastic Impedance, AVO, inversion, Mudrock Line
PENGARUH OZON YANG DIBANGKITKAN MENGGUNAKAN REAKTOR DIELECTRIC BARRIER DISCHARGE PLASMA (DBDP) TERHADAP KONSENTRASI OKSIGEN TERLARUT, KESADAHAN, DAN pH PADA AIR MURNI Adhi Prasetyo; Muhammad Nur; Zaenul Muhlisin; Sapto P Putro
Youngster Physics Journal Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A research on the application of dielectric barrier discharge reactor configured as a cylindrical spiral using ozone-producing which using the air as  source  and in atmospheric conditions. In this study, the observed effect of ozonation to show the influence to  dissolved oxygen, pH and Calcium carbonate. Active Electrode using copper wire spiral and has pyrex to be the dielectric. Plasma produce using AC voltages of 2 kV, 10 kV, 12.5 kV and frequencies between 880 Hz to 891 Hz. Air flow rate of 1.5 L / min. At the same time ozonation, using different voltage produce different ozone concentrations. If more voltage applied, the concentration of ozone is increasing. Similarly, the measurement of dissolved oxygen concentration and Calcium carbonate. But of water pH measurements obtained tends to be stable.Keywords: Calcium carbonate, DBD reactor, dissolved oxygen, ozone, pH.
PENENTUAN KOEFISIEN SERAPAN KAYU BANGKIRAI (SHOREA LAEVIFOLIA) DAN PERBANDINGANNYA TERHADAP TIMBAL (Pb) SEBAGAI DINDING RUANG RADIOLOGI DIAGNOSTIK Japeri Japeri; Heri Sutanto; Choirul Anam
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Shield utilization is very important to protect employee and people from radiation. Therefore, the rules are made that one of them is to regulate construction design of diagnostic radiology room which meet radiation protection standart. Indonesia has natural resources which potential to be radiation shield material. The research has been done to determine absorption coeffcicient of bangkirai (Shorea laevifolia) and its comparison with Pb as wall of diagnostic radiology room. X-ray absorption between bangkirai and Pb as the following : Voltage, current and time of X-ray mobile were setted in 81 kV and 32 mAs, distance between focus and object was 100 cm, Multi Purpose Detector (MPD) placed under object, area of irradiation field opened in 5 cm x 5 cm, central beam placed in the center of objects appropriately and then expotion was conducted for untreated bangkirai with (Pb) and treated bangkirai which heated in 100°C for  60 minutes repeteadly according to variation of determined thickness material, finally expotion was conducted for each thickness for three times so that average value obtained and it was repetead until absorption coefficient value of this material obtained.  Result of X-ray absorption on bangkirai tests showed that absorption coefficient () effective for untreated bangkirai and treated bangkirai is 0,029/mm and 0,027/mm, respectively. Equality result showed that unheated bangkirai with 1,3 mm Pb is equivalent with 254 mm untreated bangkirai, while heated bangkirai with 1,3 mm Pb is equivalent with 273 mm treated bangkirai. To reach 2 mm of Pb, untreated bangkirai and treated bangkirai were used with thickness off 391 mm and 420 mm, respectively.Keywords : X-ray mobile, Multi Purpose Detector (MPD), Pb, Bangkirai, Absorption Coefficient ()
PENERAPAN TEKNOLOGI PLASMA DENGAN MEMANFAATKAN RANCANG BANGUN OZONE GENERATOR UNTUK PENGAWETAN CABAI MERAH (CAPSICUM ANNUUM L.) GUNA MENDUKUNG KETAHANAN PANGAN NASIONAL Yudi Pratama; Anna Adianti; Dhyan Prastiwi; Rofiqotul Khasanah; Zaenul Muhlisin; Muhammad Nur
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In the research, done ozonation of red chili (Capsium annum L.) to getting preservation methods for saving red chili (Capsicium annum L.). To observe the effect treatment of ozone gas, cleaned chili then soaking on water while ozone was dissolving on the water. Then chili that dissolving on water ozonation to be saving on open space, glass cupboard and cooling spacie.On saving to one month have getting that red chili has ozonation and saving on cooling space still in fresh condition.Keywords: Red pepper, ozone, ozone generator
FAST FOURIER TRANSFORM (FFT) UNTUK ANALISIS SINYAL SUARA DOPPLER ULTRASONIK Arif Syaifuddin; Suryono Suryono
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The vibration is a physical phenomenon that frequently occur in a system. This study examines the Doppler effect that occurs in a system by observing signals generated sound system with ultrasonic inspection methods and analyzes these signals to function Fast Fourier Transform (FFT) Matlab. The system is made by utilizing the collision object being towed magnetic field. Collision time is controlled by the microcontroller ATmega16 is used as a reference signal. The experiments were performed 3 times with a delay variation interval or different. The research data in the form of a frequency output signal microcontroller port and the reflected sound wave Doppler ultrasound fetal Doppler devices recording the results using computer software scope version 1.31. The signal was tested by using a fast Fourier transform to look at the frequency domain signal using Matlab 2013 on computer programming. The test results show the system has a lot of FFT frequency. But can be observed the 3 dominant frequency system. The test results compared to the reference frequency FFT shows the amount equal to the sum frequency generated by the microcontroller mean Doppler frequency spectrum of the sound is 387.597 Hz.Keywords: Signal, Doppler Effect, FFT, Ultrasonic Inspection, Dominant Frequency

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