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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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ANALISIS INTRUSI AIR LAUT MEGGUNAKAN DATA RESISTIVITAS DAN GEOKIMIA AIRTANAH DI DATARAN ALUVIAL KOTA SEMARANG Tabitha Abid Ardaneswari; Tony Yulianto; Thomas Triadi Putranto
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

emarang lowland-alluvial area is in the state of salt water intrusion, that has a direct impact to the groundwater quality. Groundwater quality is not only triggered by water level decreasing factors due to the groundwater exploitation,but also by the factor of lithology and aquifer condition. The purpose of this research is to know the resistivity rocks value, the value of groundwater quality, and to analyze the distribution of the estimated area that has been instuited by salt water. The result of processed data with Progress 3.0 is in the form of resistivity value which is correlated with groundwater quality testing value with salinity, electrical conductivity, dissolved oxygen, andpH parameters. Based on the geo-resistivity and groundwater geochemical data shows that there is intrusion salt water distribution area which occur in Trimulyo area with the resistivity value of 0,27 Ωm as the indicator of salinity and groundwater quality value parameters which show the salinity value of 3.600 mg/L, electrical conductivity of 6.370 μS/cm, dissolved oxygen of 0,8 ppm, and pH 7,7.
ANALISIS PERBANDINGAN PARAMETER DAN PROFIL DOSIS MENGGUNAKAN PHANTOM STANDAR DAN TIDAK STANDAR Nora Fajria; Wahyu Setia Budi; Zaenal Arifin
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

A study has been conducted to analyze the dose parameters are CTDI100, CTDIw, CTDIvol, DLP and dose profiles by using standard phantom (150 mm) and non-standard phantom (300 mm). This research utilized an abdomen phantom, CT Dose Profiler and software Ocean. Exposure factors in this study in accordance with the conditions of the abdomen routinely performed at the Hospital of the tube voltage 120 kV, current 350 mA, collimation 40 mm, and pitch 1.375. The detector is placed in the center of the phantom and scanning with variation of scan-length 150 mm and 200 mm in the standard phantom (150 mm) and the variation of the scan-length 150 mm, 200 mm, 300 mm in non-standard phantom (300 mm). The result obtained is the parameter dose values in the non-standard phantom (300 mm) are higher than standard phantom (150 mm). At a scan length of 150 mm, the difference in value is 4.825% CTDI100, CTDIw 4.858%, 4.823% CTDIvol, and DLP 4.820%. Meanwhile, the difference in the value of the parameter dose at the scan length of 200 mm is CTDI100 3.477%, 3.494% CTDIw, CTDIvol 3.510%, and DLP 3.512%. The resulting dose profile has similar peak-dose value but have a different width so that the dose profile in non- standard phantom (300 mm) is wider and having higher FWHM value than the standard phantom (150 mm) because non-standard phantom has longer scan length that lead to excessively scattered radiation.Keywords: CT Dose Profiler, dose profiles, scan length, standard phantom, non- standard phantom, CTDI100, CTDIw, CTDIvol, DLP, FWHM.
Pemodelan inversi gayaberat dengan panduan Euler deconvolution untuk struktur bawah permukaan di Lapangan Panas Bumi ”B24” Brandan Tito Ramadhan; Agus Setyawan; Dwi P. Sasongko; Imam Baru Raharjo; R. M. Tofan Sastranegara
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

Gravity data inversion requires a good initial mesh model to generate a good subsurface model. Ambiguities in gravity data can be reduced by Euler deconvolution’s point cluster result that show its position and depth. These point cluster can give an additional information to shape the initial mesh model for inversion. The purpose of the study was to determine the influence of Euler deconvolution to the inversion. Inversion was done by the steepest descent algorithm. Euler deconvolution method and inversion algorithm were tested on synthetic models and showed good results that Euler deconvolution able to construct actual density distribution. These methods were applied to the gravity data on the "B24” geothermal field. Residual anomaly map has a value of -12 to 24 mGal. The geothermal field is estimated that it has a major fault which mainly striking in northwest-southeast direction. These estimates are supported by the results of Euler deconvolution which indicate the presence of fault and graben structure. Euler deconvolution and inversion method were applied perpendicularly to the main structure at the southwest-northeast direction. The results of this study are the Euler deconvolution method is able to provide information for a mesh geometry for inversion. From the inversion result, “B24” geothermal field is estimated has a high-low-high density distribution dominated by andesite and tuff. To improve the results of the research, it needs a measurement point addition, additional modeling area, geological and geochemical data to strengthen the interpretation.Keywords: density, Euler deconvolution, gravity inversion, geothermal
Rancang Bangun Sistem Pencitraan Menggunakan Gelombang Ultrasonik Dengan Metode Time of Flight Agung Chandra Prasetya; Suryono Suryono
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

Abstract Research about imaging using ultrasonic wave with Time of Flight method has been carried out. This research purposed in defining image of underwater object surface. This system really worths to defining surface contour and also surface, leak and crack of pipe. This system consists of ultrasonic pulse generator, stepper motor driver, and underwater imaging system application. Microcontroller used as pulse trigger on IC 74HC221. Obtained pulse then stabilizes by IC 74HC00. Afterward, pulse gets amplified by pulse amplifier, transistor 2N3906 and MOSFET IRF 840, as results, sensor could vibrate and produces ultrasonic wave. Time of flight could be determined by counting delay time while pulse emitted and received back. Received echo signal transducer amplified by Op-Amp LF356. It also compared by comparator LM339. Echo signal transfer by microcontroller to computer through serial communication RS-232. Microcontroller output signals were amplified by transistor BD139 and TIP31 then stepper motor could be work. Data acquisition for depth carried out at 150 points at x-axis and 15 points at y-axis. This system has been realized and could shows and save the results in 3D graphics format. Testing results of system showed imaging system has linear correlation value R=0,999 and SD=0,051.   Keywords : ultrasound wave, imaging and Time of Flight
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
Produksi gas hydrogen menggunakan metode elektrolisis dari elektrolit air dan air laut dengan penambahan katalis NaOH Yoyon Wahyono; Heri Sutanto; Eko Hidayanto
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This study deals with the production of hydrogen gas (H2) using electrolysis method. H2 gas is a source of Renewable Energy (EBT).This research was conducted to determine the amount of concentration (ppm) and purity (% vol) of H2 gasses produced by electrolysis method. The purify and concentration of H2 gasses was determined using gas analyzer and MQ sensor 8 respectively. The results showed that the production of H2 gas with the highest concentration was obtained in aqueous electrolysis DM + NaCl + NaOH with a 12 volt voltage 4500 ppm. Production of H2 gas in aqua DM electrolysis, aqua DM + NaCl, and aqua DM + NaOH no detectable pollutant gas such as CO, CO2, HC, NO.Keywords: Electrolysis, Energy, Hydrogen gas, Catalyst.
ANALISIS PENGOLAHAN DATA SEISMIK LAPANGAN “R” DENGAN METODE CRS (COMMON REFLECTION SURFACE) STACK PADA DATA CROSS SECTION MARINE 2D Rezyta Handani; Udi Harmoko; Istiqomah Ari Kusuma
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

ABSTRACTIn complex geological data processing, conventional method has not been able to produce good imaging. The result of conventional method processing can be supported by Common Reflection Surface Method (CRS) stacking. This method is believed to have better mathematical operation compared to conventional method, especially in Normal Move Out (NMO) correction. CRS stack method using correct operator stacking for recorded reflector in pre-stack data is proven better than conventional method. Operator CRS stacking consists of 3 kinematic wavefield attributes namely α, RNIP and RN. CRS stacking process to acquire good CRS section involved angle, aperture, and dip test. The selected parameter was then released as CRS supergather which then was used as the input of PSTM process. The best CRS operator was obtained using the parameters as follows:  apperture 500 – 2000m and angle 45˚. This result was able to increase the continuity and the reflector accuracy. Nevertheless, CRS stack also caused spectrum reduction in high frequency but it was able to be overcomed using Whitening. CRS supergather shows better result than conventional supergather using PSTM process. During the research, CRS analysis in the cross section of two tracks as the development of CRS application was also performed, where the sections resulted from CRS Stack did not influence the cross section of those two tracts.
INTERPRETASI POLA ALIRAN FLUIDA PANAS BUMI DENGAN METODE SPONTANEOUS-POTENTIAL (SP) DAN SUHU PERMUKAAN DANGKAL DI LERENG UTARA GUNUNG TELOMOYO KABUPATEN SEMARANG Maila Shofa; Udi Harmoko; Sugeng Widada
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The model heat flow at  Telomoyo Mountain Semarang District  has measured and identified  using spontaneous potensial and  shallow temperature surface methods.Field data has proceed using Microsoft Excel which the result entered to Surfer11 with the result map contour of SP and temperature distribution. The result showed that range anomaly SP about -40mV-70mV and distribution of temperature which has temperature range 23,5º-31ºC. The direction of heat flow direct from South to North-East.Key Words : Spontaneous-potential, shallow temperature surface, Sufer11, Model Heat Flow, Telomoyo Mountain
ANALISIS STRUKTUR BAWAH PERMUKAAN DAERAH HARJOSARI KABUPATEN SEMARANG MENGGUNAKAN METODE GEOMAGNET DENGAN PEMODELAN 2D DAN 3D Mars Widodo; Tony Yulianto; Udi Harmoko; Gatot Yulianto; Sugeng Widada; Yusuf Dewantoro
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

Research of analysis subsurface structure in Harjosari Semarang district using geomagnet methods with 2D and 3D modelling. In this study, magnetic data acquisition was carried out in 93 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T and 2 units geotron magnetometer G5 models to get the values of the total magnetic field. The result of measurement data is processed by the daily variation correction and IGRF correction (International Geomagnetic Reference Field). The corrected data has been used to create total magnetic anomaly contour. The total magnetic anomaly contour has been used to process reduction to plan surface. The result of reduction to plan surface has been used to create a contour 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. Result of research an incision on the closure pair of positive and negative to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result shows that was a fault zone below the surface about 210 to 1000 meters depth. The existence of the fault structure below the surface was estimated as a result of rock shifting from the northeastern area of research. Result of a 3-dimensional (3D) modelling using UBCMag3D software to determine subsurface structures more clearly by including error values, parameter values susceptibility and density models. On the results of the 3D display of subsurface structures found any difference in stark contrast to the susceptibility value at a depth of 225 meters to 1200 meters. The susceptibility value differences suspected presence of fault structures below the surface.
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN AREA MANIFESTASI PANAS BUMI AIR PANAS PAGUYANGAN BREBES MENGGUNAKAN METODE GEOLISTRIK DENGAN KONFIGURASI SCHLUMBERGER Agnis Triahadin; Agus Setyawan
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

Geothermal systems as the renewable energy can be indicated by the presence of surface manifestations, such as hot spring water in the Kedungoleng village, Paguyangan Brebes. The hot spring water temperature reaches 740 C is the outflow zone of Mount Slamet geothermal system. Resitivity method is one of the geophysical methods to study subsurface structures based on the electrical properties of rocks. The purpose of this study is to identify the subsurface geological structure in the area of geothermal manifestations Paguyangan based on resistivity method using Schlumberger configuration. Data acquisition process was performed by 5 sounding points with a length of 400 metre for each points. The field data consist of current, voltage and apparent resisitvity were processed using inversion method from IPI2Win software to determine the true resistivity values. Rock lithology and geological structure were analyzed by correlating resistivity and local geological information.The lithology of research area are topsoil with the resistivity is 9,91 to 114 ohm-metre then Sandstones with the resistivity is 0,756 to 6,91 ohm-metre. The next is Shale with the resistivity is 45,1 to 107 ohm-metre and Marl is 31 to 92,3 ohm-metre. The hot spring water is controlled by fault structure which a detected depht approximately 130 metre. Moreover, the Sandstone roles as permeable layer which contains the thermal fluid.Keywords: Fault, geothermal, lithology, Paguyangan, resistivity, and Schlumberger

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