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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.
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Articles 346 Documents
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RANCANG BANGUN SISTEM KENDALI UNIT PENGOLAHAN AIR BERSIH BERBASIS ARDUINO UNO R3 DAN NEXTION Supriyadi, Achmad; Setyawan, Agus; Suseno, Jatmiko Endro
BERKALA FISIKA Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019
Publisher : BERKALA FISIKA

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Abstract

The control of the ordinary water treatment unit on refinery location is still operated manually(by operator), especially in the filtering unit (IRF unit). There are 9 manual block valves that must be operated every 8 hours, to keep the water quality meets its specification. Manual operation can increase the risk of errors or delays in the operation or movement of service cycles and regeneration sequences. Subsequently, it can decrease the water quality and unefficiency in production. The automation of the water treatment unit was made using the nextion HMI touch screen circuit, Arduino Uno microcontroller, IC shift register, electronic relay and other electronic components. By connection between the Nextion HMI as an interface and the Arduino Uno microcontroller as electronic relay controller, the design of the control unit was able to control the clean water treatment unit simulator in accordance with the principles of the processing unit.Keywords: Water treatment unit, nextion, arduino uno
Identifikasi Struktur Lapisan Bawah Permukaan Daerah Manifestasi Emas Dengan Menggunakan Metode Magnetik Di Papandayan Garut Jawa Barat Arifan Kahfi, Rian; Yulianto, Tony
BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
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Abstract

A geophysical investigation has been done using magnetics method at Papandayan, Garut, West Java. The aims of this research are to interpret the sub-surface geology structure at Papandayan based on 2D modelling and geological information. Raw data processing was performed using IGRF (International Geomagnetics Reference Field) and diurnal variation correction to obtain total field magnetic anomaly. Upward continuation was performed at 150 meters height above reference spheroide for total field anomaly. Reduction to pole was performed to simplify interpretation process. Data acquired using Proton Precession Magnetometer (PPM) and Global Positioning System (GPS) Garmin during 3 days, which cover an area of 600 meter x 1100 meter and measurement spacing was 5 meter. Qualitative interpretation were done by upward continuation total field magnetic anomaly maps. While quantitative interpretation was done by 2D modelling by slicing upward continuation total field magnetic anomaly maps using Geomodel. It is interpreted that Papandayan sub-surface geology structure was controlled by tuff rock with susceptibilities 1 x 10-5 in emu system, andesite rock with susceptibilities 0.0135 in emu system, porphyry rock 0.010 in emu system, intrusion rock with susceptibilities 0.013 in emu system, sedimentary rock with susceptibilities 7 x 10-5 in emu system, and sedimentary rock with susceptibilities 8 x 10-5 in emu system. Porphyry rock as gold prospect is interpreted as alteration zone of silisification. Keyword: magnetics, gold, Papandayan.
STUDI AWAL DAMPAK PERUBAHAN IKLIM BERBASIS ANALISIS VARIABILITAS CO2 DAN CURAH HUJAN (Studi Kasus; Semarang Jawa Tengah) Gernowo, Rahmat; Adi, Kusworo; Arifin, Zaenal
BERKALA FISIKA Vol 15, No 4 (2012): Berkala Fisika
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Abstract

Impacts of climate change marked by the increasing emissions of CO2 in the air and increased precipitation make various parties began to feel the need to measure the gas content on a regular basis.These gases gradually accumulating in Earth's atmospheric layers. However, the desire was constrainedby a number of issues which then affect the accuracy of the continuous mapping circulating gas in theatmosphere. Researchers speculate that the amount of CO2 and other gases is growing each day due tothe many additional human-produced carbon emissions from burning fossil fuels. The results obtained bythe pattern of variability in Semarang rising CO2 and rising precipitation trends show an indication ofclimate change has occurred. It was proven occurrence of climate anomalies and the previous year.Keywords: CO2 variability, Rainfall Semarang
Penentuan Gaya Tolak Menolak Magnet Antar Dua Magnet Permanet Menggunakan Metode Kesetimbangan Benda Asih Nugroho, Kuncoro
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Use of magnets vary in life. Use of magnets depending on needs. Magnets can be used from the side: the field is generated, attractive force and repel force between the two magnets. Special utilizing repel forces magnetic one used on the railways to reduce the friction between wheel and rail.One way to determine the amount of repel force magnet is to use the object equilibrium. Two similar magnetic poles will repel. Large repulsion force depends on magnetic field (B) accrued and distance (r) the two magnets. Two magnets with similar poles are placed in the shell will give rise to vertical distance between the magnets to each other.  There is a balance between the repulsive magnetic force with the gravity due to the mass of the magnet when the magnet above the rest. Magnetic repulsive force can be determined for certain r by changing the magnetic mass. Large magnetic gravity on each r can be computed from the gravity due to the magnetic mass.   Keywords: repel force, gravity
KORELASI NILAI TIME REPETITION (TR) DAN TIME ECHO (TE) TERHADAP SIGNAL TO NOISE RATIO (SNR) PADA CITRA MRI Aji Prastowo, Alan Tanjung; Setiabudi, Wahyu; Anam, Choirul
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Abstract

Effort to obtain a correlation of TR and TE to the value of Signal to Noise Ratio (SNR) in MRI machine has been carried out. In this research used MRI Hitachi Airis II which has a permanentmagnetic field of 0.3 Tesla. Research using a phantom object with Polyethylene Vessel containingNiCl2: 18 mmol/l. Phantom has a tube diameter 165 mm, cap diameter 120 cm and height 320 mm.Image acquisition is done with two TE value of 20 ms and 120 ms, and TR values varied from 100 msto 4000 ms, with the scale of 100 ms. Slice taken with a thickness 5 mm, and in the position 15 cm fromthe bottom of phantom. Region of interest (ROI) in the image is determined at the radius of 65 cm.SNR calculation is then performed for a variety of TE and TR. It was obtained that the SNR valueincreases exponentially for TR value of 100 ms to 700 ms and stabilized at the next TR to 4000 ms. Atthe same TR, SNR value at TE 20 ms greater than the TE 120 ms. At TE 20 ms, TR optimal value forT1WI is at 700 ms, with a SNR value of 57,6 ms, whereas for PD image on TR 3900 ms with a SNR of57,6. At TE 120 ms, TR optimal value for T2WI was at 2200 ms with SNR value of 19.Keywords: Magnetic Resonance Imaging (MRI), Time Repetition (TR), Time Echo (TE), Signal toNoise Ratio (SNR)
Studi Sifat Termal Prekursor In(TMHD)3 Untuk Menumbuhkan Lapisan Tipis In2O3 dengan Teknik MOCVD Saragih, Horasdia; Hasniah, Hasniah; Sustini, Euis; Sukirno, Sukirno
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

The In2O3 thin films have been deposited on quartz substrate by MOCVD technique using In(TMHD)3 as a metal organic precurcor. Thermal properties of In(TMHD)3 material have been investigated by analyses of TG-DTA curve and FTIR spectrum to determine the value of In2O3 deposition parameters. Based on TG-DTA curve and FTIR spectrum analyses, we find that: (1) melting point of In(TMHD)3 powder is 175oC; (2) In(TMHD)3 powder starts to evaporate at 184oC; (3) partial oxidation of In(TMHD)3 in Ar/atmosfer accur at 260oC; and (4) dissosiation of TMHD ligand from indium metal element happened in the temperature range 300oC – 400oC. According to these results, we maintaned growth condition for deposition of In2O3: the temperature of In(TMHD)3 bubbler (Tb) = 200oC; the pressure of In(TMHD)3 bubbler (Pb) = 260 Torr; the rate of argon gas flow to carried out the vapor of In(TMHD)3 = 50 sccm; the rate of oxygen gas = 50 sccm; and temperature of substrate = 300oC. In 120 minutes, the thickness of deposited In2O3 thin films, the rate of deposition, and the roughness of film surface are about 0.2 µm, 1.6x10-3 µm/menit and 70 nm, respectively.   Keywords: In(TMHD)3 precursor, In­2O3, thin films, thermal properties, MOCVD.
ANALISIS FENOMENA ELECTROHYDRODYNAMIC PADA PERMUKAAN MINYAK SILIKON (CAIRAN DIELEKTRIK) MENGGUNAKAN SISTEM PEMBANGKIT PLASMA LUCUTAN PIJAR KORONA NEGATIF DENGAN ELEKTRODA BERKONFIGURASI TITIK BIDANG Nur, Muhammad; Anam, Choirul; Arisa, Betri
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
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Abstract

An analysis of Electrohydrodynamic (EHD) phenomenon deformation of oil silicon surface has been done.The negative corona glow discharge plasma in this research is generated by plasma generator system in point to plane electrodes configuration. The first step of experiment is to determine correlation of voltage and electric current, and correlation of distance between electrode and electric current. Then, the second is to determine correlation of voltage and hole radius of oil silicon surface, and corelation of distance between electrode and hole radius of oil silicon surface. Finally, it is to determine  the velocity hole for back to initial position of oil silicon surface after turn off electric field. The EHD phenomenon of oil silicon can be generated by impose of non homogeneous high electrics field. The voltage of corona at distance between electrodes 1 cm, 1,5 cm and  2 cm are 2,6 kV-4 kV,  3,4 kV-5,2 kV, and  3,8 kV-6,0 kV respectively. The increase of electrics field intensity influence dipole moment strength, it increases the radius of the hole of oil silicon surface. The increase of distance between electrode influence parabolic angle of electrics line field then cause the increase of hole radius. After this, if the electric field is zero with  increasing voltage, velocity hole of  oil silicon for back to initial position  slower then if the increasing of h, that makes the velocity hole for back to initial position faster.   Key words: Electrohydrodynamic, Silicon Oil, Dielectric polarization, Positive corona glow discharge plasma, ionic wind.
PERUBAHAN FUNGSI GELOMBANG ELEKTRON PADA MULTIPLE SCATTERING UNTUK SUDUT HAMBUR NOL Guswantoro, Taat; Nur, Muhammad; Gunawan, Vincencius
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014
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Abstract

Multiple scattering in the plasma present doe to movement of charged particle influenced by Coulomb interaction between charged particles in the plasma. Research on multiple scattering among influences of effective field on the multiple scattering, lost energy due to scattering processes, the aims of this study are to determine the scattered wave function, multiple scattering cross-sections and scattered electron energy. The understanding of the electron scattering in the plasma in this study using the optical approximation that is application of wave properties of electron. The calculation of  scattered wave function is using first Born approximation, by taking the scattering potential energy is the summary of potential energy of electron by interaction with each ions that present in the plasma sphere. Electron wave function after scattered is changes, though the direction is same with the direction of initial electron coming, presence a reduction in amplitude as a function of the distance the wave trajectory. Keywords: Multiple Scattering, Plasma, Born approximation.
Cover Juli 2009 Juli 2009, Cover
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Abstract

Cover Berkala Fisika, Vol. 12, No. 3, Juli 2009
Penentuan Karakterisasi Cerrobend Sebagai “Wedge Filter” Pada Pesawat Teleterapi 60Co Azam, Much.; Firdausi, K. Sofjan; Silvani, Sisca
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
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Abstract

Wedge filter usually used in cavum nasi ossa maxillaris tumor therapy. And usually it is made of timbal. However, cerrobend as the alternative material is possible and needed too. The material characterization is done through determining the linear absorption coeffisien of cerrobend and the proportion of the thickness of cerrobend to timbal,  and as well as comparing the total treatment dose rate of timbal wedge filter with cerrobend wedge filter. Based on the result of the research, it is found that the linear absorption coeffisien value of cerrobend wedge filter with energy of 1.33 MeV is 0.43% cm-1. The average ratio of the thickness of cerrobend to timbal is 1.485 ± 0.002, and the difference of the total treatment dose rate between those two wedge filter is only a little, that is 0.72 cGy/minutes.  Keywords : cerrobend, wedge filter and the linear absorption coeffisien

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