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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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INTERPRETASI LAPISAN BAWAH PERMUKAAN DENGAN TRANSFORMASI PSEUDOGRAVITASI BERDASARKAN DATA GEOMAGNETIK PADA MANIFESTASI MATA AIR PANAS KENDALISODO KABUPATEN SEMARANG Nanang Didik Susilo; Muhammad Irham Nurwidiyanto; 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

Kendalisodo’s area has geological structures which formed by volcanic Ungaran there are hot springs manifestations has been do secondary geomagnetic data processing obtained in the measurement in Kendalisodo Semarang District. The study aims to interpret the subsurface conditions around the hot springs area Kendalisodo caused the emergence of the hot springs in the area. A total of 63 data points that have been corrected International Geomagnetic Reference Field (IGRF) and daily variation correction is used to make the contours of the total magnetic field anomalies. Contour anomaly magnetic field is then processed using a upward continuation filter, reduction to the pole filter, pseudogravity transformation filter, horizontal and second vertical gradient derivative filter. The results of data processing in the form of total magnetic field anomalies that indicate closure pair of positive and negative closure indicating the fault zone below the surface. This interpretation is supported by the contour anomalyand pseudogravity contour, horizontal gradient which shows that there is a fairly strong density contrast and vertical gradient analysis of the order of two indicates that the fault is a reverse fault type. The interpretation is reinforced also by modeling results that indicate a fault that appears on the rock Gajahmungkur and kaligetas formations in the area Kendalisodo trending northwest-southeast. This fault zone is a media outlet fluid to the surface that appears as the source of the hot springs
INTERPRETASI STRUKTUR BAWAH PERMUKAAN DAERAH MANIFESTASI MINERAL EMAS SISTEM EPITHERMAL DENGAN METODE POLARISASI TERIMBAS (INDUCED POLARIZATION) DI DAERAH “X” KABUPATEN GARUT JAWA BARAT Alifa Rusyda; Tony Yulianto
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 geophysical investigation has been done using Induced Polarization Method at area “X”, Garut, West Java. The purpose of this investigation is to identify the sub-surface stucture of a minerals gold epithermal system manifestation area.The research area is a gold prospect area which is a mining concession area ofAneka Tambang, Tbk. Stratigraphy lithology constituent part of the study area Jampang Formation which consists of andesite lava, andesite breccia, hornblende, and fine tuffaceous rocks. Induced Polarization method is usingelectrical properties of rocks by detecting the electrical polarization on the surface of metallic minerals beneath the earth's surfaceThe processed data is measured with Dipole-dipole configuration, with electrodes spaced 25 meters. Path length  200 meters, so the expected penetration depth reaches 600 meters. Data processing use software AGI EarthImager2D and Geosoft , is obtain imaging the model 2D and 3D  subsurface. The processing results is present in 2D and 3D, From the modeling results indicate that the tuff and Crystallin Tuff    rock and minerals sulphide (si-ka-il, ka-il) with resistivity values ranging from 150 to more than 1000 ohm.m ohm.m and chargeabilitas values ranged from 100 ms to more than 300 ms, distribution pattern is decreased from north to south and then to east in penetration depth reaches 600 meters of subsurface.Volume for estimated potential of minerals gold epithermal system manifestation is 161.302.421,7 m3Keywords: Gold, Epithermal System, Induced Polarization, AGI EarthImager2D, Geosoft
PENGUKURAN PERUBAHAN POLARISASI PADA AIR BERAS MENGGUNAKAN HAMBURAN MIE Wahyuni Wahyuni; Ketut Sofjan Firdausi
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

Have been done scattering studies of rice water using polarization method with the light sources is a green laser with a wavelength of 532 nm and variations of the density of rice water. The test samples consist of three kinds of rice water obtained from different rice tipes.Change of scattering polarization direction is perpendicular to the incident light. Then observed the changes of scattering polarization angle seen in analyzer. The result showed that the scatttering polarization angle changes produced by the green laser in the rice water is increased to the amount of rice water particles. Then changes of scattering polarization angle in qualitative influenced by the size of rice water particles.
INTERPRETASI POLA ALIRAN FLUIDA PANASBUMI MENGGUNAKAN METODE SPONTANEOUS-POTENTIAL (SP) DAN SUHU PERMUKAAN DANGKAL PADA SISTEM PANASBUMI PAGUYANGAN KABUPATEN BREBES Yayan Yuliananto; Agus Setyawan
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Fluid flow and temperature researchs has been done in Paguyangan geothermal manifestation based on spontaneous-potential and shallow surface temperature methods. An aims of research is to determine the pattern of fluid flow and shallow surface temperature distribution in the Paguyangan area, Brebes.Data acquisition for spontaneous potential measurement used fixed electrode configuration with 15 meters interval distance divided into 3 lines. Shallow surface temperature measurement which taken in 75 cm depth in around of Paguyangan manifestation area. Spontaneous potential anomaly and shallow surface temperature anomaly analyzed by correlated spontaneous potential, shallow surface temperature and rocks lithology in Paguyangan manifestation.  The Result shows that spontaneous potential values obtained has range between -11 to 11 mV and temperature range between 24° to 70° C. Fluid flow has a depth range between 13,42 to 28,75 meters and range between 8,21 to 30,33 meters with a tilt range between 46,06° to 12,60°. The pattern of fluid flow leads to the northwest.Keywords: Spontaneous-Potential, shallow surface temperature, Pattern of fluid flow, Paguyangan
Karakteristik plasma lucutan berpenghalang dielektrik isian gas Nitrogen Febry Fitriani; Muhammad Nur; Fajar Arianto
Youngster Physics Journal Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research on the characteristics of the dielectric barrier discharge filled with Nitrogen gas fields has been done. The plasma reactor that used in this study formed by a spiral-shaped cylindrical electrode component. Spiral electrode is made of copper wire with 72 windings and 25.05 mm of diameter, while the cylindrical electrode from copper sheets are glued on the walls of the outer tube diameter of 0,27 mm with a length of 25 cm. The dielectrics that used is pyrex with a length of 30 cm, a diameter of 3 cm, and a thickness of 2,45 mm. Characterization of dielectric barrier discharge plasma is used to determine the working area of the reactor and knowing the initial voltage to the emergence of the current as a sign of discharge. This characterization was done with Nitrogen gas field, which is a variation of voltage used is from 0,4 to 1.2 kV with a rise of 0.2 kV interval and Nitrogen flow rate of 2-8 L /min with intervals increase of 1 L/min. Result in the discharge flow 7 L/min with the lowest mobility value of 58.300 m2/V.s and the discharge flow 4 L/min with the highest mobility value of 91.600 m2/V.s. Therefore, it can be concluded that the greater the saturation current value, the greater the value of the ion mobility (μ).Keywords: Dielectric barrier discharge plasma, Characteristics of dielectric barrier discharge plasma, Mobility of charge carriers.
SINTESIS LAPISAN TIPIS NANOKOMPOSIT TiO2/CNT MENGGUNAKAN METODE SOL-GEL DAN APLIKASINYA UNTUK FOTODEGRADASI ZAT WARNA AZO ORANGE 3R Rizky Bimanda Sakti; Agus Subagio; Heri Sutanto
Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Nanocomposite thin film of TiO2/CNT as a photocatalyst material was  synthesized using the sol-gel method with the dispersion of commercial TiO2 Merck in CNT. The crystal structure and nanocomposite thin film morfology of TiO2/CNT were characterized using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Sol TiO2 0.3 M was mixed into the sol CNT with mass ratio of CNT:TiO2 was 1:5. Sol TiO2/CNT was sprayed on a glass substrate that was  heated at a temperature of 250 oC, then it was heated at the temperature of 450 °C for 60 minutes. Photodegradation was done by dipping the nanocomposite thin film of TiO2/CNT into 100 mL Azo Orange 3R dye sol 10 ppm, then was irradiated using UV light with a wavelength 380 nm. XRD pattern analysis showed that TiO2 has anatase structure with crystallite size at the range from 72-92 nm by using Scherrer equation. SEM image analysis showed that the grains of TiO2 sfreris pattern and was dispersed on CNT. Refluks TiO2/CNT nanocomposite thin film had been able to degrade Azo Orange 3R dye sol for 12 hours until percentage of 98,2% which was much better than the non reflux TiO2/CNT nanocomposite thin film as 97,2% and the TiO2 thin film as 90,9%. Keywords : TiO2, carbon nanotubes, thin film, nanocomposite, photodegradation, Azo Orange 3R dye.
Analisis mobilitas pembawa muatan pada lucutan plasma korona positif konfigurasi kawat silinder menggunakan gas nitrogen Victor Prima Saputra; Muhammad Nur
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research on mobility of charge carries in positive corona plasma have been done by using a cylindrical wire configuration and nitrogen gas field. Plasma reactor that used in this research is a stainless tube with a length of 24 cm and a diameter of 3.5 cm. The characterization of current and voltage is used to determine the value of charge carrier mobility. This characterization was performed using nitrogen gas field. The voltage variation used was 0-11 kV with an increase interval of 0.3 kV and the flow of Nitrogen flow of 2-6 L / min with an increase interval of 1 L / min. From the research for positive corona obtained the highest charge carrier mobility at flow rate 2 L/minute equal to 0.115 ( m^2)⁄Vs and lowest charge carrier mobility at flow rate 3 L/minute equal to 0.0413 ( m^2)⁄Vs. At flow rate 2 L/minute the mobility between positive and negative corona have significant difference of 0.115 ( m^2)⁄Vs and 0.459 ( m^2)⁄Vs then decreased until finally at the gas flow rate 6 L/minute of positive coronas and negative corona have equal charge carrier mobility of 0.093 ( m^2)⁄Vs.Keywords: Plasma corona, characteristic current-voltage, the mobility of the charge-carriers, voltage, current
PEMBUATAN PROGRAM REKONSTRUKSI KONTUR CITRA 3D PADA ORGAN MENGGUNAKAN MATLAB 2008a Siti A'isyah; Kusworo Adi; 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

Program of contour  Reconstruction of 3D imaging at organ has been done. To determine the tumor volume by creating a 3D contour Planning Target Volume (PTV) and organs at risk in head for each image slice. Determination of 3D PTV contour begins with contouring, featuring contour, contour editing and showing PTV and organs at risk in 3D. So that a more accurate determination of radiotherapy dose and the organ at risk dose does not exceed a given tolerance. 3D contour reconstruction algorithm can be displayed on each slice so organ at risk boundary and Planning Target Volume (PTV) that used to radiotherapy treatment can be seen.Keywords: radiotherapy, treatment planning system (TPS), Planning Target Volume (PTV).
PEMBUATAN GENERATOR MIKRO WINDBELT DENGAN OPTIMASI PARAMETER PITA DAWAI DAN MAGNET Muhammad Hidayat; Jatmiko Endro Suseno
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

ABSTRACTWind energy has the potential to be utilized as a power plant. One of the utilization of wind energy into electrical energy by making Windbelt generator. Then do research to find the value of the voltage on the generator Windbelt optimization by varying the parameters of the ribbon and the magnet, the magnetic variation on this Windbelt generator includes a magnet and a thick diameter magnet, variations among others 10,12,15,18,20 mm diameter while the thickness variation between another 1.5 and 2 mm. Then for the ribbon parameters include length of ribbon and tape width, variations in use for a long ribbon among others 60,80,100 cm whereas the variation for bandwidth among others 15,18,20,25,30 mm. In order to obtain the optimal voltage value then the coils and wind speeds need to be noticed and measured, variations 1000,1500,2000 winding coils used for measuring wind speed at 1,2,3,4 m / s. Having done research found value best optimization of parameter variations - variations of which have been taken to optimsi voltage on the generator Windbelt with a diameter of 18 mm, thick magnet 2 mm, band width 20 mm, length of ribbon 60 cm, the number of windings in 2000, the wind speed of 4 m / s. Generate a voltage value stream optimization for 5 Volt, 146 mA and Power 0.73 mWatt large voltage generated Windbelt generator capable of powering the LED.Keywords: Windbelt, voltage optimization, neodymium magnet, ribbon
ANALISIS DOSIS SERAP RELATIF BERKAS ELEKTRON DENGAN VARIASI KETEBALAN BLOK CERROBEND PADA PESAWAT LINEAR ACCELERATOR Lamtiyah Ikha Indriyana; Eko Hidayanto; Zaenal Arifin
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

During radiotherapy treatment, critical organs are shielded using cerrobend blocks. The objective of this study was to define the minimal thickness of cerrobend blocks so that the relative absorbed dose in target less than 5%. All measurements were performed using linac Siemens/Primus Mclass 5633. Phantom relative absorbed dose were measured for square field 10 x 10 cm2. The thickness of cerrobend blocks were 2, 4, 6, 8 and 10 mm. The measurements in water were performed using compact chamber fitted with acrylic build up caps.The minimal thickness of cerrobend blocks for 5, 10 and 14 MeV electron beams are 2, 4 and 6 mm, respectively. The relative absorbed dose for phantom’s surface, maximum depth and x-ray tail using those blocks are 0.12%, 0.16%, 0.21%, 2.18%, 1.56%, 1.16%, 2.92%, 2.47% dan 1.70%.The relative absorbed dose decreases with the increasing of cerrobend block  thickness and phantom depth. Therefore, if cerrobend blocks are used to protect critical organs, the thickness should be taken into account accurately.Keywords: cerrobend blocks, relative absorbed dose, electron beams

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