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INDONESIA
BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 23, No 2 (2020): Berkala Fisika" : 6 Documents clear
ANALISIS DIMENSIONALITAS DATA MAGNETOTELURIK LAPANGAN PANAS BUMI “SA” BERDASARKAN METODE TENSOR FASE Akbar, Shofya; Setyawan, Agus; Yulianto, Tony; Baroek, Marino Christiano; Ramadhan, Irvan
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Magnetotelluric (MT) method is one of a passive electromagnetic method in geophysics. Principally MT measures the temporal variation of the electromagnetic field that is induced to the surface of the earth to get the subsurface resistivity structure. Information about the geoelectric strike and dimensionality of the magnetotelluric data is important to modelling the subsurface structure. Information is used to determine the 1D, 2D or 3D approach that can be used to interpret MT data. Therefore, an aim of study is to identify the direction of the geoelectric strike and dimensionality structure in the "SA" geothermal field. The data were used is secondary data that has been corrected using shift correction. Phase tensor method was used to analysis the dimensionality of magnetotelluric data. Principally the phase tensor method is to determine the dimensionality by looking the difference between maximum and minimum phase that can be describe the main direction of structure in the field area. The results of geoelectric strike analysis and the dimensionality of the magnetotelluric field data for the "SA" geothermal field show the direction of geoelectric strike N345oE or N15oW with 1D, 2D and 3D dimensionality structures.
ESTIMASI UKURAN KRISTAL DAN PARAMETER ELASTISITAS NANOKRISTAL ZnO:Ce MENGGUNAKAN METODE SIZE-STRAIN PLOT Kinasih, Diah Ayu Suci; Nurhasanah, Iis
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The physical properties of nanocrystals depend on the crystallite size that correlates with the characteristics of the crystal structure. This research aims to estimate the crystal size and elasticity parameters of ZnO:Ce nanocrystals based on x-ray profile analysis using the sizestrain pot method. Nanocrystal of ZnO:Ce was synthesized using the precipitation method with a calcination temperature of 500 oC. X-ray diffraction measurements were used to analyze the crystal structure of ZnO:Ce. Identification of x-ray diffraction peaks revealed the formation of ZnO:Ce nanocrystals with hexagonal wurtzite structure and lattice parameter smaller than bulk ZnO. The crystal size of 112 nm and the correlation coefficient of 0.97 obtained from the sizestrain plot method is greater than the Scherrer formula. These results indicate that lattice strain contributes significantly to the broadening of the spectrum profile of x-ray diffraction peaks of ZnO:Ce nanocrystal.
KARAKTERISASI LUCUTAN PLASMA YANG DIBANGKITAN DENGAN ELEKTRODA AKTIF MENGGUNAKAN JARUM SUNTIK DAN ELEKTRODA PASIF BERUPA BIDANG LENGKUNG PADA KONDISI ATMOSFIR Ardhianto, Khamdi Bagas; Bawono, Ari; Muhlisin, Zaenul
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Research on characterization of plasma discharge generated by active electrodes using syringes and passive electrodes in the form of curved fields under atmospheric conditions has been carried out. The study was conducted to obtain the characteristics of the I-V relationship and visual picture of the formed discharge. The syringe used was 0.6 mm in diameter and was used as an active electrode. Plasma discharge was generated by connecting the syringe and curvature with a high-voltage DC (HV DC) generator. The syringe was connected with a positive pole, given a potential difference gradually to the maximum of HV DC and observed for the plasma discharge. After that, the syringe was connected to the negative pole, then given a potential difference gradually until the maximum of HV DC and observed plasma discharge. The distances between the point electrode and the curve electrode were 2 mm, 3 mm, 4 mm and 5 mm. The results showed that the relationship between current and voltage on the syringe as positive and negative electrodes followed the equation I ~ V2 until just before the spark discharge appeared and then arc discharge. The variation in the distance between the electrodes in each syringe treatment affected the amount of voltage needed to generate discharge. The greater the distance between the electrodes, the greater the voltage needed to reach the arc discharge.
SENI MEYIAPKAN GAMBAR UNTUK PUBLIKASI IMLIAH Anam, Choirul
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

SENI MEYIAPKAN GAMBAR UNTUK PUBLIKASI IMLIAH
PEMBUATAN PEMANAS INDUCTION UNTUK SISTENSIS MATERIAL DENGAN MOTODA HIDROTERMAL Nurkholis, Nurkholis; Bawono, Ari; Priyono, Priyono
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Induction heaters furnace could work faster and more efficiently compared to the conventional electric heaters, but a temperature regulation system should be quite good and stable with a fairly long operating time. This method is suitable for the synthesis of materials that require a long operation time, such as hydrothermal process. This study aims to design and evaluate the induction heater using K-type thermocouple sensor with proportional Integral Derivative (PID) control system. Thermocouple sensors calibration tested on a set point of 150 °C to 350 °C gives a good result at stable temperature values after tested less than 90 seconds and have low error rates at 0,02% - 0,16%.  Hydrothermal synthesis process on reactor with a heating temperature of 300 °C for 24 hours gives a good result.
ANALISIS NILAI COMPUTED TOMOGRAPHY DOSE INDEX (CTDI) PHANTOM KEPALA MENGGUNAKAN CT DOSE PROFILER DENGAN VARIASI PITCH Sari, Devi Artika; Setiawati, Evi; Arifin, Zaenal
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The purpose of this study was to measure the value of computed tomography dose index (CTDI) using the CT dose profiler, to compare the values of CTDI obtained in the five holes within the head of polymethil-methacrylate (PMMA) phantom, and to analyze the effect of pitch on CTDI values. The CTDI values were measured with the pitch variations of 0.562, 0.938, 1.375, and 1.750. The phantom was scanned with fixed parameters of 120 kVp, 200 mAs, 10 mm width collimation, 150 mm scan length, and 0.50 s tube rotation. Measurements were conducted at Kensaras hospital using the CT scannner of GE Optima CT580 16 slice. The results showed that if the pitch increases, the CTDI will decrease (< 25 mGy). The highest CTDI is 55,36 mGy and it is found on a pitch of 0,562 at upper hole of phantom (B position), and the lowest CTDI is 11,9 mGy and it is found a pitch of pitch 1,750 within a hole at three o’clock position (C position). If the pitch < 1, then the high CTDI is obtained (> 50 mGy) and it takes longer to scan.

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