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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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ATENUASI MULTIPLE SEISMIK REFLEKSI LAUT MENGGUNAKAN METODE FILTERING RADON PADA PERAIRAN X Murtiningtias Diah Ayu Martha Dewi; Oki Hedriana; Agus Setyawan
Youngster Physics Journal Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Multiple caused by waves that trapped in a layer of sea water or rock layers. The effect information propagation time longer effect as if there is a new layer, thus looping wave reflection. The existence of multiple noise is disruptive and even damaging that complicates intrepetasi in interpreting seismik that have focused so that multiple seismik cross sections obtained free of multiple. Methods in multiple energi weaken, one of them by using the filtering radon method which, in principle, filtering radon, radon transform of the data pre-stack time-offset domain (t-x) in the domain of p-tau (τ-p). In τ-p domain and the expected multiple primary signal can be distinguished by the speed difference moveoutnya. This study aims to evaluate the response of radon filtering is applied to the conventional method for multiple mengatenuasi. The results obtained from the radon showed multiple filtering methods reduced from previous conventional methods which showed multiple. It shows good effect radon filtering methods to weaken multiple.Keywords: multiple, Radon filtering, conventional method.
PENENTUAN FREKUENSI RESONANSI PADA ARTIFISIAL METAMATERIAL MENGGUNAKAN BENTUK SPLIT RING RESONATOR (SRR) Muh Yasin YBIC; K Sofjan Firdausi; Priyono Priyono
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

Metamaterial represent the material with negative value of permitivity ( ) and permeability ( ). Artificial metamaterial can be realized with periodic structure of wire for the negative relative permittivity ( ), and Split Ring Resonator (SRR) for the negative relative permeability ( ). This research represent the theoretical study about the dimension effect of SRR to active frequency of electromagnetic wave ( ) at artificial metamaterial. Plasmon resonances in SRR due to the interaction with the electromagnetic waves used to determine  in order to obtain the equation in the form of frequency. From these equations graphically simulated between  to the  at various dimension size of SRR, so can be knowable about the dimension effect of SRR to active frequency of metamaterial. At periodic structure of SRR, if the distance apart of SRR ( ) increase hence top boundary of active frequency (magnetic plasma frequency, ) decrease, and  bottom boundary of active frequency (SRR resonance frequency, ) do not change. If radius of SRR ( ) increase hence will decrease the  and . If  the gap ring of SRR ( ) increase hence increase of  and . Keywords: permitivity, permeability, metamaterial, Split Ring Resonator.
INTERPRETASI STRUKTUR BAWAH PERMUKAAN DI MUARA SUNGAI PROGO MENGGUNAKAN METODE MAGNETIK Dewi Andri; Muhammad Irham; Udi Harmoko
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

Progo fault is one of the active faults located in the south of Yogyakarta. Progo fault is suspected that located in Progo River estuary area, Banaran, DIY. However, studies are still needed to support the scientific basis of the position and the type of fault in Progo River estuary. Magnetic survey has been carried out in DIY Progo River estuary to determine the subsurface structure in the area. Data needed in the processing of magnetic data is a magnetic anomaly data obtained from the values of the total magnetic field strenghthas been corrected. In this study, magnetic data acquisition was carried out in 97 points by using a PPM (Proton Precession Magnetometer) geometrics 856X. Data Processing began with International Geomagnetic Reference Field (IGRF) correction and diurnal correction to get the total magnetic anomaly. The total magnetic anomaly contour created by using Surfer that has been used to process upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. Mag2D used to create 2D modelling to obtain the subsurface structure and susceptibility values. To reinforce the results of subsurface structure, 3- modelling has been created by used Mag3D. In 2D-modelling of subsurface structure is obtained in the form of fault zones in the west an the east of the River Progo. The interpretation is reinforced by the result of 3D-modelling in the area. There are tworeserve faults in Progo River estuary area, first in the west of the Progo River and second in east Progo River to a depth of 1000 meters.
ANALISIS DISTRIBUSI COMPUTED TOMOGRAPHY DOSE INDEX (CTDI) PADA BODY PHANTOM Nur Paramita Nira Mulyono; 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

Measurement of Computed Tomography Dose Index (CTDI) Distribution in Body Phantom has been done in Dr. Karyadi’s Hospital. The purpose of this research were to find out value of CTDI in the five holes in body phantom and to determine relation between slice thickness and CTDI. This research used CT Dose Profiler in helical CT and CT Dose Profile Analyzer Software. This measurement applied protocol of abdomen with tube voltage 120 kV, time rotation 200 mAs, pitch 1, scan length 160 mm, and scan time 5, 07 second. Measurement was applied variation of detector position in the five holes (center, top perifer, right perifer, bottom perifer, and left perifer) and slice thickness   1 mm, 2 mm, and  3 mm. Average CTDI value in five holes of body phantom has range about 11,97 mGy until         13,17 mGy. There are slight differences among all of five holes. It show that dose ditribution in the center and perofer of body phantom tend to be homogeneous. The fluctuation of CTDI values for 1 mm, 2 mm, and 3 mm slice thickness has nocertain pattern or trend. CTDI values have slight differences among the thickness. The measurement show that   1 mm, 2 mm, and 3 mm slice thickness has 0,5 mGy difference to CTDI value. Keyword: CTDI, five holes, body phantom, slice thickness
Pengujian bahan untuk elektroda pada sistem dielektroforesis Much. Azam
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

In this paper described the results of electrode material testing point-field configuration for the system dielektroforesis. Type of materials used iron, stenlees, silver and gold. Testing is done to know the type of material that is not easy to cause electrolysis in bioparticle medium, either with or without layer of insulator (glue). The test was also conducted to determine whether or not the phenomenon of electrophoresis in water flea (cladocera) was given a 1-10 voltlt AC voltage with a frequency of 6 MHz. The test results showed that in all types of electrode materials used, electrolysis did not occur when the electrodes were given a layer of insulator, and electrolysis occurred when not given a layer of insulator. While the phenomenon dielektroforesis not visible when given AC voltage up to 10 Volt and frequency 6 MHz.Keywords: Dielectrophoresis, cladocera, electrolisis, point-plate electrode
RANCANG BANGUN SISTEM PENGUKUR INTENSITAS CAHAYA MENGGUNAKAN MICROSOFT VISUAL STUDIO C# UNTUK MENENTUKAN SUDUT PUTAR JENIS LARUTAN GULA Wardono Istiyawan; K. Sofjan Firdausi; Heri Sugito
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

A system of measuring the light intensity to determine the specific rotary angle of  sugar has been carried out. Research is done using a computer with a Microsoft Visual Studio C#. In this research there are some stages as follow light sensors and the system of measuring polarization angle. LDR as light intensity sensor, the result has been processed in a series of conditioning at the output signal. The result of  this series can be input in interface application.  Measurement of polarization angle can be done by counting average value of the intensity before it gets into the materials and thereafter. This system has been realized and can show the results obtained in the form of graphs and can be stored. The value of the angular turn kinds of sugar unmeasured is (51,33±0,42) omL/dm gram. Results of testing equipment and the characteristics of the sensor with a linear regression coefficient R2 = 0,9906 and  SD = 0,82. Keyword : Microsoft Visual Studio C#, Specific rotary angle, Polarization angle,  LDR
ANALISIS PROFIL BERKAS RADIASI LINEAR ACCELERATOR 6MV PADA PENGGUNAAN VIRTUAL WEDGE DENGAN GAFCHROMIC FILM Arisa Dwi Sakti; Eko Hidayanto; Heri Sutanto; Sanggam Ramantisan
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

Analysis of the radiation beam profile linear accelerator 6mV on the use of virtual wedge with gafchromic film done as a virtual wedge calibration on the linear accelerator . Virtual wedge calibration was originally done using ionization chamber detector, but its use is not efficient because for one-time calibration with an area of 10 x 10 cm2 field takes 10 times the exposure with the results of 10 data transform one dose profile curve . It takes a dosimeter that can capture the entire virtual dose results wedge with one exposure is gafchromic films with an area that can be customized . This research was conducted with a virtual wedge on the Siemens PRIMUS linear accelerator , scanner Epson Stylus 10000 XL , Solid Water Phantom , Matlab Program and Excel Program. This research begin to find the corelation between radiation beam and pixel value on gafchromic film with field size 1x 1 cm2. This corelation in used to find profile dose of virtual wedge from gafchromic film with field size 1 x 11 cm2. Variation fof gafchromic film is in this angle on 150, 300, and 450, opening jaws in Y1and Y2and teh last variation of half beam position in (-10 until 0),(-5 until 5) and (0 until 10). This research find that in higher beam dose, make the darkness film but lowerpixel value.ther are 2 corection in jaws position Y2 half beam (-10 until 0)300 and jaws position Y2 half beam (0 until1 0) 450. No one of ymetrisity value higher than 3% appropriate with AAPM TG-47.Keyword: virtual wedge, profil dosis, gafchromicf film, half beam
APLIKASI METODE BIDIMENSIONAL EMPERICAL MODE DECOMPOSITION (BEMD) UNTUK DATA GAYABERAT GUNUNG UNGARAN, INDONESIA Fuad Tarmidzi; Agus Setyawan
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

Gravity method processing will obtained gravity anomaly which is combination between regional and local gravity anomalies that need to separate it for interpretation. Upward continuation method commonly used to separates regional and local gravity anomalies. Recently, the separation of these anomalies can be done with Bidimensional Empirical Mode Decomposition (BEMD) method which its calculation based on gravity anomaly profile. BEMD will separates gravity anomali profile based on its frequency that some sub-sinyal will obtained from it. On this research, BEMD method has been used to separate gravity anomaly of Ungaran Mountain dan the result of it compared with the result from Upward Continuation method. 5 Intrinsic Mode Function (IMF) and 1 residual were obtained from BEMD method, wherein IMF3 showed pattern of regional gravity anomali and IMF1 showed pattern of local gravity anomaly. With using these methods, obtained patterns were similar. Keywords: BEMD, Gravity anomalies, Ungaran, IMF
WIRELESS SENSOR SYSTEM UNTUK PEMANTAUAN KADAR GAS AMONIA (NH3) MENGGUNAKAN ALGORITMA BERBASIS ATURAN Arlien Siswanti; Suryono Suryono
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

Ammonia gas (NH3) is one of gas that causes air pollution. Ammonia gas (NH3) a colorless and has a very pungent is very dangerous if too much for by humans perhaps even cause of death. Wireless sensors system with the telemetry system can be solution measurements made from a distance. The study is done by making a wireless sensors system for monitoring levels ammonia gas (NH3) algorithm rule based as a limit exposure to the submission of the data use the network wifi. This system allows monitoring, recording levels of gas and early warning system ammonia gas from a distance. A system that created composed from sensors MQ-135 connected with mikrokontroler ATmega8535. The sensor reading is converted from analog to digital (ADC). Microrontroller ATmega8535 has USART feature (Universal Synchronous and Ansynchronous Serial Receiver dan Transmitter) as a serial communication mode. A communication system data using protocol RS232 to connect data serial communication to personal computer (PC). The results of the data acquisition sent to the station monitoring to technique telemetry use the network wifi that can be accessed in web browser on pc and to display in real-time presented in the form of table and saved to in a database. Testing system done by sending a number of data from field will be accepted by the monitoring stations. Several variables resulting from monitoring system that is date, time, temperature, moisture, levels of ammonia gas and health effects as a rule about the exposure ammonia gas. Result of the comparison between the data sent and received data has errors by 0% so that it can be ascertained no data is lost or gained. This suggests that the system going well.Keywords: Ammonia gas, MQ-135 sensor, Ruled base algorithm, Database, WiFi network. 
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER AREA PANAS BUMI KENDALISODO KECAMATAN BERGAS KABUPATEN SEMARANG Alchacindy Guenergar; Udi Harmoko; Sugeng Widada
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 research has been done by using geoelectric method schlumberger configuration at Kendalisodo geothermal manifestation . The purpose of researching is to know layer of subsurface structure which control Kendalisodo geothermal manifestation.Measurement has been conducted using schlumberger configuration. The data observation conducted at 4 points  around by Kendalisodo hot springs . Data processing conducted using software IP2WIN. Data measurement in the field are potential differences and currents which can be used to calculate apparent resistivity value. After apparent resistivity value is created then processed using IPI2WIN program to know resistivity value in each layer with geology information validation. The results of the study showed seven  geoelectric layer of rock that is composed of layers of topsoil, sandstone, breccia, tuffan sandstone, breccia, tuff, and  combined Sandstone and breccia with resistivity values and different thicknesses. Interpretation of manually indicate the presence of  down faults that are weak zone where the fluid surface discharge.Keywords : geoelectric, geothermal, and Kendalisodo

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