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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
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Identifikasi geological strike dan dimensionalitas berdasarkan analisis phase tensor untuk pemodelan 2D magnetotelurik di lapangan panas bumi “GYF” Ganap Y. Febrika; Agus Setyawan; Muhammad Irham Nurwidiyanto; Imam B. Raharjo
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

Magnetotellurics method is frequently used in exploration of geothermal resources for determining the subsurface resistivity distribution of the Earth. An accurate representation of the Earth’s resistivity structure can be obtained by knowing the direction of geoelectrical strike and dimensionality structure prior to modelling. Besides those both cases, distortion in the data magnetotelluric can lead to errors of interpretation. Therefore, this study was conducted to identify the geoelectrical strike direction and dimensionality structure in the “GYF” geothermal field using phase tensor analysis prior to 2D modelling. Three invariant parameters of phase tensor i.e ellipticity, phase tensor skew angle (β) and Azimuth of phase tensor maximum (α-β) are used to get the information about the dimensionality and geoelectrical strike direction on 65 magnetotelluric data in “GYF” geothermal field. Results of the phase tensor analysis show that the direction of geoelectrical strike is N60°W or 300° at frequency (10-0,2 Hz) and dimensionality of subsurface structure consists of a structure 1D, 2D and 3D. Structure of 1D and 2D is in the frequency range 320 to 0,2 Hz, while the 3D structure is at a low frequency, ie f < 0,2 Hz. Identification of geoelectrical strike and dimensionality in 2D magnetotelluric modelling can minimize misinterpretation.Keywords: Dimensionality, geoelectrical strike, distortion, phase tensor
RANCANG BANGUN SISTEM AKUSISI DATA SENSOR MAGNETIK EFEK HALL UGN3503 MENGGUNAKAN KOMPUTER Hernita Kusuma Wardani; 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

This research is conducted a construction of data acqusition system of magnetic Hall effect sensors UGN3503 using computer. The system made consists of magnetic Hall effect sensors UGN3503, deferential amplifier, and mikrokontroler ATmega8535 minimum system. Magnetic Hall effect sensors UGN3503 is a magnetic field detecting sensors. The output voltage when there is no magnetic field is half of VCC. Therefore, the diferential amplifier is needed. Then, the coercing result is in the from of analogue signal. This analougue signal will be converted by ADC  internal ATmega8535 into digital data in 10 bit format. Data is transmitted by the USART that is series communication mode on ATmega8535 through RS-232 interface. The result of the data can be in the form of chart that can be shown on computer using Borland Delphi 7.0 and can be saved into Microsoft Excel. This system has been realized and can perform the final result in form chart and also can be saved. The result of the tool and sensor characteristic test with linear correlation coefficient value R = 0.995 to standard tool. Keyword: magnetic Hall effect sensors UGN3503, deferential amplifier, mikrokontroler ATmega8535 minimum system, ADC, USART
PENENTUAN FAKTOR TRANSFER DAN GROWTH VALUE 134Cs DAN 60Co PADA TANAMAN BUNGA MATAHARI (Helianthus anuus L.) DENGAN CARA HIDROPONIK UNTUK KAJIAN AWAL FITOREMEDIASI Mohammad Afif Rachmatulloh; Evi Setiawati; Poppy Intan Thahaja
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

Research of determining transfer factor and growth value of 134Cs and 60Co on sunflower plants (Helianthus anuus L.) by means of hydroponics has been carried out, to obtain value of the transfer factor on sunflower plant against 134Cs and 60Co in hydroponic media. This research was conducted by growing sunflower plants on soil media until the age of 50 days and then transferred into a plastic gutter containing 134Cs and 60Co for 30 days. Number of 134Cs and 60Co absorbed and accumulated by the plant parts, namely the roots, stems, and leaves were observed by measuring the activity of 134Cs and 60Co in parts of the plant using a gamma spectrometer. The value of the transfer factor is determined by comparing the concentration of 134Cs and 60Co which accumulated by the plants against concentration in hydroponic media. From this research, the highest growth value is 2,49 for active plant on the 30thday and 4.33 for the control plants on the 25th day. The highest transfer factor value is 261.39 ml / g for 134Cs on the 25th day and 5.94 ml / g for 60Co on the 25th day. The value of the transfer factor which is more than 1 ml / g indicates that the sunflower plant is a plant that has the ability to accumulate radionuclides 134Cs and 60Co.  Keywods: Sunflower Plant, Transfer Factor, 134Cs, 60Co, Phytoremediation, Growth Value
Rancang bangun sistem pengontrol temperatur menggunakan mikrokontroller ATSAM3X8E pada peralatan ultrasonic assisted extraction (UEA) Siti Hastin Nur Indarwati; Isnain Gunadi; Suryono Suryono
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

In this research, design of temperature control system has been made for Ultrasonic Assisted Extraction (UAE) equipment. The system consisted of elemen pemanas, temperature, sensor such as Resistance Temperature Detector (RTD) sensor, relay, microcontroller and computer interface. Microcontroller that used in this system is ATSAM3X8E microcontroller that connected with computer interface as the temperature data viewer that is using Borland Delphi 7. Temperature controller could be built by RTD sensor through computer interface so it could save and show the data in MySQL database. This system ca be applied as temperature controller system for extraction equipment. From this research’s result showed system that has been built can measure and control temperature using RTD sensor with the error’s value in measurement is 0,04oC. From the controlling system testing’s result with given set point is 35oC can be known that tis controlling system has delay until it started which is for 6 minutes with the control stability’s condition 97,09% and error value 2,91%.Keywords: temperature, controller, RTD sensors, database, MySQL
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.
DISTRIBUSI FLUKS NEUTRON SEBAGAI FUNGSI BURN-UP BAHAN BAKAR PADA REAKTOR KARTINI Fatkhiyatul Athiqoh; Wahyu Setia Budi; Choirul Anam; Tri Wulan Tjiptono
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 effective multiplication factor (keff) and the flux distribution in the Kartini reactor which used Uranium Zirconium Hydride (UZrH) as fuel, pure water (H2O) as moderators and cooland has been analyzed using Monte Carlo simulation. The flux distribution analyzed by splitting core reactor become 5 rings (B, C, D, E and F). The effective multiplication factor (keff) and flux distribution calculated by MCNP 4C with burn-up variation 0%, 2,5%, 5%, 7,5%, 10%, 12,5%, 15%. The result shows that the critical condition obtained from burn-up rate 0% up to 5%. The highest value of flux distribution in the middle, at ring B and the value gets smaller towards to edge of reactor core.Keywords : flux distribution, keff, MCNP, Kartini reactor
PEMODELAN STRUKTUR PADA LAPANGAN WAHRE, CEKUNGAN MADURA, JAWA TIMUR UNTUK PERHITUNGAN CADANGAN AWAL GAS (GAS INITIAL IN PLACE) Restuwaty Indra Wahyuni; Muhammad Irham Nurwidiyanto
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

Seismic interpretation has been done in Wahre field, Madura Basin, East Java with the main target of the research is Mundu Formation, which is the existence of gas. The research aim to modeling the depth structure to estimate the initial gas reserves. Modeling of the structure obtained from the results of time domain conversion (TWT) to the depth domain (Feet). Depth modeling was obtained from the results of linier regression of uncertainity graph two well log that have different depth. The depth structure shows the location of Mundu Formation are crossways from the west sea to the southeast as the background of the geological of Madura Basin. The linier regression uncertainity result represent the value of GRV (gross rock volume) which is divided into three case. The first value is high case, the high case is 65.505.181 m3. Mid case or medium case is 65.446.249 m3. And psimis case is 58.060.543 m. The three GRV value will be used to calculate the approximate initial gas in place (GIIP). GIIP results was 64.7 BCF to high case. The medium case was 64,6 BCF. And for the psimis case was 57,3 BCF.
PENGUKURAN DAN PENGHITUNGAN VOLUME PHANTOM DARI CITRA COMPUTED TOMOGRAPHY (CT) SCAN Riris Trima Derita Sari; Kusworo Adi; 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 research has been done to the measurement and calculation of phantom volume of computed tomography (CT) Scan image. The aim of the study is to calculate the phantom volume based on CT Scan image analysis and find out the relationship between phantom volume and the variation of phantom position towards central ray. The calculation was done by using trapezoid integration method. The study used 130 kV, 93 mAs tube current, and 8 mm slice thickness. The resulting image is converted from gray scale image into a binary image. Then the surface area of the phantom was calculated. After getting the phantom surface area so that the volume of the phantom can be calculated. The calculation result shows that the phantom volume based on CT Scan image with perpendicular phantom, 30 mm to-the-left movement, 50 mm to-the-right movement towards central ray is 11160708 mm3, 11148172 mm3, and 11149136 mm3. The phantom volume based on CT Scan image with the least error percentage when phantom position is perpendicular towards central ray is 3,63%. 30 mm to-the-left and 50 mm to-the-right movement of phantom shows greater error percentage compared with perpendicular phantom towards central ray. The error percentage is from 3,74 % and 3,73 %. Phantom volume calculation is more accurate if phantom is perpendicular towards central ray. Keywords: volume, phantom, image, calculation, central ray
Rancang bangun sistem sensor nirkabel untuk memantau kecepatan dan arah aliran Erryk Yustisianto Putro; Suryono Suryono
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

On research wirelees sensor system design for monitoring velocity and direction of water. Monitoring the flow of water is needed in the field of irrigation and industry, mitigation of floods and many other applications. The system is made comprises a remote terminal unit (RTU) and control terminal unit (CTU). On the RTU are ATSAM3X8E microcontroller and microprocessor that transmit data through WiFi and received by personal computers that are in the CTU. RTU transmit the bases data to the CTU. The water velocity outtakes using waterflow sensor, which changes the magnitude of the flow rate to a variable frequency. Sensor waterflow associated with Schmitt trigger so that the output signal of the sensor is more accurate when read by the microcontroller. The frequency is read by the microcontroller and sent to a RTU computer. Flow direction in the sensor using a potensio that changed the angle (direction) into the barriers and voltage. The data is read by the analog to digital converter (ADC) microcontroller and sent to a RTU computer. Data flow velocities is calibrated with a standard velocitiy and linear correlation coefficient of 0.9997. Results of testing the angle of the magnitude of standard (protractor) linear correlation coefficient  of 1. From these tests it can be concluded that the equipment is fit for use. Keywords : monitoring system, microcontroller, RTU ,CTU, waterflow sensor
ANALISA PENGARUH pH TERHADAP PERUBAHAN NILAI DENSITAS OPTIK (OPTICAL DENSITY) PADA FILM DENGAN VARIASI JENIS DEVELOPER Rahmawati Hidayah; Eko Hidayanto; Zaenal Arifin
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

The effect of pH on the change in optical density values on the film with the variation of the type of develope was analyzed. Expected results are able to provide good information in an effort to uphold the diagnosis .To determine the relationship between the pH of the change in optical density values on the film using X-rays and objects illuminated Stepwedge, eksposi factor X-ray tube current 5 mAs with X-ray tube voltage of 50 kVp, generating a developer for one minute, the temperature of 240C denagn A variation of the type of liquid developer A, liquid developer B, and the liquid developer C. The resulting film optical density value measured using a densitometer and compared the results of the relationship between pH and the optical density at three types of liquid developer.Obtained results in liquid developer A is the highest value when the pH 11.01 with an optical density value of 2.93 at Step 11 and the lowest value when the pH 10.70 with an optical density value of 0.27 at Step 1. Liquid Developer B is the higher of the current pH 10.70 with an optical density value of 2.88 at Step 11 and the lowest value when the pH value of 10.46 with an optical density of 0.25 at Step 1. Liquid Developer C is highest when the pH value of 10.49 with 2 optical density values, 87 in Step 11 and the lowest value when the pH 10.14 with an optical density value of 0.21 in Step 1. So the higher the pH , the greater the optical density values and vice versa . Keywords : pH,optical density, liquid developer, and X-ray.

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