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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 12 Documents
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Search results for , issue "Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015" : 12 Documents clear
DETEKSI THORIUM PADA KAOS LAMPU PETROMAKS MENGGUNAKAN SPEKTROMETER BETA DENGAN DETEKTOR SINTILASI DARI BAHAN ORGANIK NAFTALEN Nina GInanto Putri; Evi Setiawati
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

The radioactivity of Thorium contained in gas mantles has been successfully detected. Thorium is the source of radiation that it emits the types of alpha (α) and beta (β) radiation, so it can be said to have radiation with little activity. In this study, the detection of radioactivity of Thorium using a scintillation detector with an organic material of Naphthalene scintillator which has a efficiency value of 53.42%. In addition, the composition of the materials was characterized by Energy Dispersive X-ray spectroscopy (EDX). Gas mantles mounted on petromaks lights and it turned on. The result of combustion of powders was pressurized, so that it became a solid sample. The variations of  sample were A and B, while there were 9 variations of Naphthalene scintillator thickness of 0.5 mm intervals in the range 1-5 mm. The A sample result of EDX characterization show that the composition of the constituent material C, Mg, Cu, and Th. The composition of the material making up the B sample  was  B, O, Y, Pt, Pb, and Th. Thorium activity was determined by counting the samples for 10 seconds each variation of the thickness of the scintillator. The radiation activities of Thorium were found in A and B samples respectively, 8.419 and 8.692 nCi.Keywords: Plasma jet, characterization of  plasma jet,  flow rate of Argon gas, voltage, current
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.
KARAKTERISASI PLASMA JET ARGON MENGGUNAKAN KOLOM DIELECTRIC BARRIER DISCHARGE (DBD) PADA TEKANAN ATMOSFER Andi Wibowo Kinandana; Muhammad Nur; Zaenul Muhlisin
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

An atmospheric of Argon plasma jet is generated with column dielectric barrier discharge high voltage alternating current. Characterization of Argon plasma jet is used to observe the effect of variations in the voltage (V) to the length of the plasma jet. Voltage (V) and current (I) were analyzed to identify its effect to the length of the plasma jet. In this study, Argon gas is passed through the capillary column by regulating the flow rate of gas. Then the voltageis being increased until the plasma jet can be seen. Voltage is used consecutively in the range 0 to 10,5 kV at flow rate of Argon gas is 3 L / min. The result shows that electrical current increase and then reach saturation condition by the increase of voltage. The increase of the length of the plasma jet were given by the increase of the applied voltage. This research indicates that the length of the plasma jet characteristics tends to increase. The value of the voltage is affects to the value length of the plasma jet.
REDUKSI LONG PERIOD MULTIPLE DENGAN MENGGUNAKAN METODE HIGH-RESOLUTION RADON DEMULTIPLE (RAMUR) PADA DATA SEISMIK DARAT 2D Faradina A. P.; Udi Harmoko; Fazrin Oktafian
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

Multiples often occur in marine seismic data, but actually, they also occur in the far offset section of land seismic in that multiple reduction in land seismic data using CDP gather resulted from conventional method can be applied to acquire omitted multiple model. There are many methods to reduce the appearance of long period multiples, yet to remove multiples from primary signals is challenging. Compared to other methods, high-resolution Radon demultiple (RAMUR) is a method which uses Radon transform to predict multiples using domain tau-p to model multiples. RAMUR processing has more advantages in identifying reflection events, both in primary signals and multiples, to produce good stack sections. In this research, CDP gather resulted from conventional method was used as input in multiple modeling. Besides, adaptive subtraction process also apply CDP gather as input data to be subtracted with multiple model to preserve the data. The result shows that high-resolution Radon demultiple (RAMUR) method is able to reduce long period multiples in far offset section using DTCUT 120 parameter in land seismic effectively.
APLIKASI METODE TRANSFORMASI RADON UNTUK ATENUASI MULTIPEL PADA PENGOLAHAN DATA SEISMIK 2D LAUT DI PERARIRAN “X” Nona Dili Maricci; Agus Setyawan
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

Multipel in marine seismic data is the noise formed due to the high impedance contrast at he boundary between layer. Multipel interfers the data processing that will also affect the interpretation of subsurface image. Radon transformation is one of the methods to attenuate the multipel. Radon transformation method is to transform the data of the domain time-offset (t-x) into a domain intercept time- ray parameter (τ-p). Primary wave and multipel will be separated with muting desain in domain (τ-p). At the end of this study to compare the result stacking preprocessing and stacking Radon. The result of the research shows that multipel in time 190-200 ms are attenuated.
OTOMASI SISTEM DESTILASI MENGGUNAKAN PLC OMRON CP1H DAN KONTROL SUHU DENGAN KENDALI AUTO TUNING PID DALAM PENAMPIL SCADA Tito Rano Pradibto; Kusworo Adi
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

Industrial world today can't be separated with the problem of automation for various production facilities, one of them is the process of distillation in industry or the oil refining industry. Distillation is the process of separating substance by boiling point, where the temperature becomes the focal point of the phase that change process so it to control of substances that aims to keep the temperature value in the range of desired values. In this study using a multilevel distillation system, so it has two set of controling temperature points. Operation of distillation system automatically works with the help of controls Service such as PLC OMRON CP1H and temperature control with auto tuning PID (Proportional Integral Derivative). The system is equipped with SCADA (Supervisory Control and Data Acquisition) and data logger so as to facilitate the operation of automation and configuration PID parameters such as proportional coefficient (Kp), the integral time (Ti), the time derivative (Td). Modeling materials processed using methanol with 64 oC boiling point and ethanol with a boiling point of 78 °C. Results of the research showed us that the temperature control system can use the auto tuning PID controled by a PLC can be done, a good temperature control is obtained with a small error rate. auto tuning method is still having oscillations, but a PID value will be automatically calculated quickly so that a constant parameter values obtained to get the stability of temperature. The value of maximum overshoot (Mp) of auto tuning of 9,09% and error steady state (ESS) of 1.53%. Results of calculation from the value of parameter auto tuning PID used as next tuning parameters and steady state response is obtained more quickly, with Mp of 4,61% and 0% of ESS.
INTERPRETASI STRUKTUR BAWAH PERMUKAAN BERDASARKAN DATA GEOMAGNETIK PADA DAERAH MATA AIR PANAS JATIKURUNG KABUPATEN SEMARANG Laela Fitria; Tony Yulianto; Udi Harmoko
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

The interpretation of subsurface structure and the identification of caused of the hot springs Jatikurung by using magnetic method have been successfully carried out. In this study, magnetic data acquisition was carried out in 71 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T models to get the values of the total magnetic field. Data processing began with IGRF (International Geomagnetic Reference Field) correction and diurnal correction to get the total magnetic anomaly. 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. The closure pair of positive and negative close to the manifestation was made an incision to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result show that there was a fault zone about 1200 meters depth. At a depth of 326 to 1200 meters was interpreted as a cap rock with a value 0.2926 (SI). The exhibition of the hot springs Jatikurung was interpreted by the finding of adjacent fault with igneous intrusion which was estimated to save the residual of magma that can be used as a heat source.
APLIKASI METODE GEOLISTRIK UNTUK MENYELIDIKI INTRUSI AIR LAUT DI KAWASAN PANTAI KOTA SEMARANG (KALIGAWE) Dhana Hastuti; Fitra Ramdhani; Fajar Waskito; Galang Virgiawan; Ganap Yuliana Febrika; Agus Setyawan
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

Kaligawe is a village in East Semarang, Central Java, Indonesia. Rising population lead to increased ground water extraction and land use. Excessive groundwater abstraction resulting height difference surface ground water to the surface of the sea water, causing sea water intrusion. To determine the value of the depth of seawater intrusion areas of research conducted using resistivity method. Data is collected as much as 3 lines. The field data in the form of current, potential difference, and apparent resistivity processed. Then made modeling 2D with Res2Dinvx32 software to produce the actual resistivity and depth of each layer of the earth's subsurface. The results showed seawater intrusion occurs in the northwest, east and south of the study area is shown with a small resistivity of 2.07-13.2 Ωm at a depth of 0-35 m below the earth's surface.
RANCANG BANGUN SISTEM TELEMETRI MULTI-CHANNEL UNTUK MONITORING SUHU DAN pH AIR MENGGUNAKAN JARINGAN WIFI Ave Gierdo Alfaseno; Suryono Suryono
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

Water quality monitoring is very important to know condition of the water in a sector location. The water quality monitoring can anticipate a decrease of water quality by knowing water condition in real-time, in that way can be determined what factors that causes a decrease of water quality. The method used for water quality monitoring system in this paper is telemetry system (remote measurement) with the wifi network. Telemetry system choosed because its more efisien than the other, measurement can be remotely and in real-time. The test of water quality is bad or good can be known from the elements of test parameters. Parameters sample tested of this research are temperature and pH of the water. To respon physical symptom of changes in amount of water temperature used temperature sensor RTD (resistance temperature detector), and a pH sensor to respon condition of pH of the water. Both of the sensor's reading are converted from analog to digital (ADC) using microcontroller ATmega8535. Microcontroller ATmega8535 has USART feature (Universal Synchronous and Asynchronous Serial Receiver and Transmitter) as a serial communication mode. Serial communication technique in a multi-channel is done by using the RS-485 protocol as a communication link beetwen one unit to another until can connect 32 and using the RS-232 protocol to connect serial communication data to personal computer (PC). The data that has been obtained is sent to the monitoring station by a telemetry technique using the wifi network. Results of the data acquisition system RTD temperature sensor against a standard thermometer has a linear correlation coefficient R = 0.998. And the results of the data acquisition pH sensor against a standard pH meter has a linear correlation coefficient of R = 0.994. Results of the comparison between the data sent and received data has errors = 0 so that it can be ascertained no data is lost or gained.
APLIKASI METODE COMMON REFLECTION SURFACE (CRS) UNTUK MENINGKATKAN HASIL STACK DATA SEISMIK LAUT 2D WILAYAH PERAIRAN “Y” Hirafiany Daruartati; Agus Setyawan; 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

Stacking is an important phase in the seismic data processing, it’s a tool or quick look before subsurface section resulted. Common Reflection Surface is the developing of the conventional processing that has been generally done. CRS method has more benefits than conventional stack method, specially on the complex structure and do not rely on from velocity model that’s really useful for seismic data processing. The main difference between CRS and conventional stacking mode is on stack parameter decision or the attribute connected to subsurface reflector. CRS application has been applied in the area “Y” using software ProMAX 2D. In this research by using marine seismic data has done five times using different apperture values, they are 150 m, 100 m, 67 m, 33 m, and 20 m for getting the best stack result. Based on the research can be concluded that CRS method has applicated successly on the 2D marine seismic data having a better result than by using conventional method, proved by CRS method stack result can show the better reflector continuity and it increases the signal to noise ratio qualitative.

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