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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.
Arjuna Subject : -
Articles 367 Documents
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Pereduksian COX, NOX, SOX, HC dari Kendaraan Bermotor dengan Menggunakan Plasma Non-Termik Nur, Muhammad; Wirawan, Bukit Yuta; Adi Wijaya, Wahyu; Suseno, Ahmad; Sumariyah, Sumariyah
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Reduction NOX gas from motor vehicle 1486 cc emission have been done by using corona glow discharge plasma which awakened with power source from modified system ignition of car.NOX Gas is result emission of motor vehicle 1486 cc at 2000 rpm. Flow NOX source are joined with reactor. Corona glow discharge plasma awakened in the reactor with knife to plane electrode geometry configuration with power source from modified system ignition of car. Corona that happened in reactor which containing of motor vehicle gas emission 1496 cc will yield ion, electron, and energetic radical. NOX will turn into compounds which do not dangerous and it’s indicate that pollutants in reactor was reduced.  To get the decomposition efficiency of NOX it’s require to be done the measurement of concentration of NOX before and after reduced. The biggest decomposition efficiency of NOX which obtained in this research is 81.38 % at distributor rotation equal to 1500 rpm with current equal to 80µA. Anion and cation analysis show there are cation NH4+ and anion CO32-, SO32-, and SO42-, that giving hypothesize that one of compiler compound of crust result of system prototype to reduce NOX are ammonium carbonate ((NH4)2CO3), ammonium sulfide ((NH4)2SO3), and ammonium sulphate ((NH4)2SO4).
UJI KESESUAIAN STANDAR NILAI HVL FILTER ALUMINIUM PADA PESAWAT SINAR-X MAMMOGRAFI: STUDI KASUS DI RUANG INSTALASI RADIOLOGI RS. SILOAM MAKASSAR Mutmainna, Azri; Astuty, Sri Dewi; Dewang, Syamsir; Mulyadin, Mulyadin
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The quality control of X-ray radiation in a radiology device plays an important role in determining the clinical use feasibility. The HVL value test of a filter is very important because it determines the effective of X-ray energy. HVL values indicate the thickness of the absorbent material to absorb X-ray intensity up to half of its original intensity. This research is devoted to testing the feasibility of Mammography equipment in the radiology installation room of Siloam Makassar hospital by comparing two methods of determinations the HVL value in the variation of voltage 23, 25, 27, 29, 31 and 33 kVp. The HVL value that determined from direct methods without filters is used as a base value that to be compared with the HVL value which determined by indirect methods through calculations after the addition of aluminum filter thicks to gradually. HVL values by indirect measurements ranged from 0.268−0.401 mmAl, while by direct measurements between 0.291−0.338 mmAl with a deviation between 1.39−7.90%. The results obtained indicate that the HVL value for all X-ray tube voltage variations from the two methods in use still on ranges the tolerance standard so that it can be reported that the X-ray mammography at the Siloam hospital was declared feasible.
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.
PENGEMBANGAN KARAKTERISTIK OPTIS PADA LARUTAN PERAK KOLOID MENGGUNAKAN METODE ELEKTRO-OPTIS Tiwiyaningsih, Tiwiyaningsih; Rahmawati, Aidah; Nurhasanah, Wahidatun Dewi; Richardina, Very; Khumaeni, Ali; Firdausi, Ketut Sofjan; Sugito, Heri; Soesanto, Qidir Maulana Binu; Azam, Much
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
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Abstract

In this paper we present a new development of optical properties on colloidal silver solutions using electro-optics effect. Samples of silver nanoparticles (NPP) were obtained by ablation method and then diluted in water to obtain various concentrations. To obtain optical characteristics of colloidal silver solutions through the electro-optical effect, the changes in the polarization of light was measured as the sample was applied by high external potential difference. The light source used was laser pointer with  = 650 nm. The results show that the colloidal silver solution shows non-linear active optical properties with increasing concentration and at a concentration of 4.6 ppm maximum natural polarization occurs. In the case of electro-optics, a voltage increase results in electro-optical contributions which correspond to the effects of non-linear polarization due to high electric fields. However, at 8 kV the maximum polarization appears also at a concentration of 4.6 ppm, which is the same as the natural polarization at that concentration. The study of colloidal silver solutions is very interesting to be further developed by electro-optical methods, because challenges and unanswered phenomena can contribute or alternative perspectives in understanding the interaction of light with matter, especially colloidal silver solutions, and the like.
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
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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.
TIPE MANUSKRIP PADA JURNAL BERKALA FISIKA Anam, Choirul
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
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Abstract

TIPE MANUSKRIP PADA JURNAL BERKALA FISIKA
RANCANG BANGUN SISTEM KEAMANAN PINTAR PADA PINTU KAMAR MENGGUNAKAN RFID, PASSWORD DAN ANDROID BERBASIS ARDUINO UNO Setyawan, Agus; Prabowo, Muhammad Nur; Suseno, Jatmiko Endro
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The security system is very important for someone who often leaves his/her home or private room that can be used by perpetrators of crimes such as thieves. In this case, a tool is needed to anticipate this crime. Security is needed to protect ourselves and our valuable assets. In this study, a tool was used to secure a room by replacing a conventional door lock with a solenoid which can only be opened if entering passwords, cards or commands from the smartphone is correct. If entering a password or card is incorrect, then the system will lock the door automatically and sound an alarm for the specified time limit. if it is correct to enter a password or card then the system will open the solenoid and the door will open automatically without having to push the door. In addition to providing good safety, it also provides a practicality that is quite good because the door can be opened and locked automatically since we often forget ourselves to lock the door.
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.
RANCANG BANGUN SISTEM KONTROL LAMPU, PAGAR, PINTU, DAN JENDELA (LPPJ) PADA MINIATUR RUMAH MENGGUNAKAN ARDUINO DAN TELEPON SELULE Aziz, Fariz Abdul; Sumariyah, Sumariyah
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The positive impact of technological advancements is to make it easier to use and to control electronic devices by a microcontroller. The aim of this research is to remotely control lights, fences, doors, and windows (LPPJ) on miniature homes using cellular phones connected to bluetooth using Arduino Mega 2560. This control system consisted of Arduino Mega 2560, LDR sensor, servo motor and motor servo2, DC motors, relays, and cellular phones. The workings of the LPPJ control system is when the LDR sensor detects sunlight, then it will give an order to the relay to turn on or off the light. In addition to using the LDR sensor to control the lights, the LPPJ system uses remote control by using cellular phones with communication via Bluetooth to turn on or off the light, to move the fence, door, and window by pressing the button on the cellphone. It is successfully designed and developed a control system of LPPJ on miniature homes using the cellular phones.
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

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