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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 367 Documents
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Analisis Sudut Kemiringan Lempeng Subduksi di Selatan Jawa Tengah dan Jawa Timur Berdasarkan Anomali Gravitasi dan Implikasi Tektonik Vulkanik Dwi Indriana, Rina
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Gravitation anomaly research had been done to predict the subduction dip and model. The gravitation research covered East and Central Java, Indonesia. Upward continuation used for regional anomaly mapping. Two dimension modeling from each cross-sectional used grav2poly or grav2dc. From 2D model subduction dip was calculated. The research result were subduction dip various between 3,40 to 8,20. There is a suggestion that low magnitude of dip correlated with volcano activity and high magnitude of dip correlated with some depresstion zone. Key word: subduction zone, subduction dip, gravitation modeling
Membangun Filter Berdasarkan Model Amblesan dan Dinamika Muka Air Tanah Untuk Memisahkan Sumber Anomali Gaya Berat Mikro Antar Waktu Supriyadi, Supriyadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Filter has been fabricated based on the model of microgravity two sources of anomalies over time, ie subsidence and groundwater level dynamics. Model adjusted for field conditions with several assumptions, one of which is the porosity of the aquifer consists of homogeneous sand and clay sand is 30% filled with water.  Gravity response due to subsidence, soil water dynamics and combined the two done 2D FFT. FFT process is changing the data from the spatial region to region frekuensi. Furthermore, the filter is built by performing mathematical operations division, which is output divided by input. The output data of the gravity response due to subsidence or ground water dynamics, and input is combined response and the dynamics of gravity due to subsidence of ground water. Experimental results show that in order to create a filter that gives a small error when using filters subsidence dimensional (XY) of the same or greater dimension of subsidence are filtered. Differences dimensional subsidence subsidence filter with a filter at X = 100 m and Y = 100 m gives 1.744% error. Giving a small error when using filters subsidence dimension (Z) the same or smaller dimensions are filtered subsidence. Differences dimensional subsidence subsidence filter with a filter of 1 cm gives 7.322% error. For the case of subsidence of more than one location indicates that the smallest error occurs if you use the filters subsidence dimension equal to - average dimensions of subsidence to be filtered.   Keywords: filter, subsidence, groundwater
SISTEM AKUISIS DATA KOMPUTER PADA SENSOR ULTRASONIC RANGER UNTUK PENGUKURAN LEVEL MUKA AIR Suryono, Suryono; Surarso, Bayu; Saputra, Ragil
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Abstract

This paper describes the method of ultrasound ranger development, data acquisition system and its characteristic than applied for automation water level distance measurement system using personal computer. This system is very important for recorded of water level data acquisition inlong time so data communication at measurement system.The system consist of ultrasonic distance sensor, microcontroller for time-of-flight counter and   serial interface,  and computer system fordata acquisition system. The microcontroller drive of sensor for generate of burst pulse. The 16-bitof counter of  microcontroller  was used for time-of-flight counter. Data was transmitted tocomputer twice at 8-bit of counter register. The microcontroller transmitted data at 9600 BPSusing UART protocols and slave-master for serial communication system. The communicationsystem was connected at voltage level communication RS232. The computer application of dataacquisition system was connected at COM port using Cport pellete in Borland Delphi. Thecollected data calibrated using standard.  The result of system characterization  have highmeasurement stability system at 99,61%, range of measurement distance at 10 cm to 280 cm,linear correlation with standard measurement at R = 0,9999, so it good for more application.Keywords : distance, pulse, counter, serial communication
Investigasi Bidang Gelincir Tanah Longsor Menggunakan Metode Geolistrik Tahanan Jenis di Desa Kebarongan Kec. Kemranjen Kab. Banyumas Sugito, Sugito; Irayani, Zaroh; Permana Jati, Indra
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

Investigation of landslide slip surface using geoelectrical resistivity method has been conducted at Kebarongan Village, Kemranjen District, Banyumas Regency. Data acquisition by means Schlumberger and Wenner configuration.  Data processing and interpretation were using Progress version 3.0 and Res2Dinv version 3.54 softwares.  The output of Progress software were depth, number of layers, and values of rock resistivity.  Mean while the output of Res2Dinv were resistivity section, RMS, and depth of rock layers.  The interpretation result showed that at Kebarongan village lithology consist of four layers i.e. top soil, sandy clay, wet clay and sandy clay.  Slip surface is wet clay with depth of 10.31 until 14.21 m.  The slip surface orientation is same of slope area that is to south and the type of landslide is translational.      Keywords: geoelectrical resistivity, landslide, slip surface, Kebarongan
Analisis Fenomena Elektrohidrodinamik pada Permukaan Minyak Silikon Menggunakan Plasma Lucutan Pijar Korona Positif Rahayu, Sri; Azam, M.; Triadyaksa, Pandji; Nur, Muhammad
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
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Abstract

The aim of this research is analysis electrohydrodynamic phenomenon deformation of oil silicon surface by technology of positive corona glow discharge plasma which generated by plasma generator system with point-to-plane electrodes geometry configuration. Variation of voltage and distance between electrodes had been treated to surface of silicon oil. Electrohydrodynamic phenomenon deformation in this research is caused by polarization and ion wind. Ionic wind would be happened if applied voltage over the corona threshold that was 2.6 kV. Graph current of saturation corona unipolar for variation voltage, being formed semi-parabolic equation while the variation of distance between electrodes, being formed linear equation. The hole diameter at variation voltage was influenced by electrics field intensity and momen dipole strength. The hole diameter at variation of distance between electrode was influenced by parabolic angle of electrics line field. The oil velocity for back to initial position is different. Velocity would be go down if the voltage progressively go up and velocity would be go up if the distance between electrode progressively go up.
PENGARUH ADITIF BaCO3 PADA KRISTALINITAS DAN SUSEPTIBILITAS BARIUM FERIT DENGAN METODA METALURGI SERBUK ISOTROPIK Nugraha, Priska R.; Widanarto, Wahyu; Cahyanto, Wahyu Tri; Kuncoro, Handoko S.
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015
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Abstract

Influences of concentration of BaCO3 on crystallinities and susceptibilities of barium ferrites using isotropic powder metallurgy method of fabrication is studied based on the characterization of X-Ray Diffraction (XRD), crystallite size distributions and hysteresis curve of Vibrating Sample Magnetometer (VSM).  In this study, Fe2O3 of Cilacap iron sands are doped with BaCO3 with various concentrations of 15%, 30% and 45% at 1100 °C of sintering temperature.  The results show that the addition of BaCO3 affects the formation of the multi-phase barium ferrite crystals and widen the crystallite size distribution, as well as lowering the saturations and the magnetic remanences. The optimum composition for barium ferrite magnets is obtained for 15% of BaCO3, with the highest mass susceptibility of 2.4 × 10-6 M3/Kg. Keywords: Barium hexaferrites, isotropic powder metallurgy, crystal characterizations, permanent magnets
Penghitungan Rasio Intensitas Ca (II) 396,8 nm dan Ca (I) 422,6 nm pada Sampel Tasbih Asli dan Imitasi menggunakan Metode Laser Induced Shock wave plasma (LISPS) Khumaeni, Ali; Setia Budi, Wahyu; Firdausi, K. Sofjan
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
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Abstract

Spectral analysis of elemental bead samples has been done using Laser Induced Schock Wave Plasma (LISPS). This experiment is aim to distinguish between bead samples from fresh white coral and its artificial from hardwood through determination of spectral intensity of Ca(II) 396,8 nm and Ca(I) 422,6 nm. The samples are held by 10 torr and induced by NdYAG Laser 1064 nm in wavelength. Results show that the original and artificial samples can be distinguished from ratio of intensity at 1,68 : 0,80 both for white coral and its artificial from hardwood through determination of spectral intensity of Ca (II) 396,8 nm dan Ca (I) 422,6 nm respectively.
KORELASI POLARISASI ELEKTRO-OPTIS DENGAN KOMPOSISI ASAM LEMAK PADA MINYAK ZAITUN SEBAGAI METODE UJI ALTERNATIF MUTU MINYAK GORENG Nurhasanah, W Dewi; Sugito, Heri; Richardina, Very; Azam, Much; Firdausi, Ketut Sofjan
BERKALA FISIKA Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019
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Abstract

In this study the quality of olive oil which has been degraded due to heating has been tested using the electro-optical transmission polarization method. The light source used was a laser pointer with λ = 650 nm. The degradation of the quality of olive oil was measured to be based on changes in the electro-optical polarization angle, while changes in the composition of fatty acids were tested using Gas Chromatography and Mass Spectroscopy (GCMS). The results showed that the polarization angle increases in second order polynomial on the increase in voltage and linearly on the heating duration in the sample which showed a decrease in the quality of homogeneous olive oil. Assuming that the polarization change is a linear combination of the main fatty acids from olive oil, it is obtained that C19:2 and C19:0 fatty acids are the most contributing to oil quality, that is, the reduction in oil quality is indicated by increasing polarization which is accompanied by an increase in C19:0 fatty acids and a reduction in C19:2 fatty acids. Whereas specifically for electro-optical polarization, in addition to C19:2 and C19:0 fatty acids, C19:1 also appears which slightly increases polarization by increasing the fatty acid. This method can be developed further for investigation into other vegetable oils, as well as evaluating halal oil due to contamination of lard.Keywords: Electro-optical polarization, olive oil, fatty acid composition, change inpolarization angle
Rancang Bangun Sensor Pergeseran Tanah Digital Suryono, Suryono
BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
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Abstract

The Research has been produced digital displacement field sensor system.  This system can be applied on displacement level monitoring of building, bridge, dike  and so forth. This developed system work serial digitally so that It can be connected to computer for many purpose. The field Displacement sensor use sliding potentiometer and  a 10 bit Analog to Digital Converter (ADC) at microcontroller. The value of field displacement is sent digitally as multi byte serial  data through UART serial communication protocol. The acquired data read to computer through COM1 with Borland Delphi 7.0 program. The research A system which can measure field displacement has been  acquired from this research. The system has 1 mm resolution specification with the range of measurement up to 57 meters. From the  sensor’s output  has been acquired the output of the system with has the equation  y = 0,990x + 0,154 with the linear correlation  0,998. Keyword : Displacement, digital, serial
PEMBUATAN KOMPOSIT SERAT SERABUT KELAPA DAN RESIN FENOL FORMADEHIDE SEBAGAI MATERIAL PEREDAM AKUSTIK Kartikaratri, Yohana Maya; Subagio, Agus; Widyandari, Hendri
BERKALA FISIKA Vol 15, No 3 (2012): Berkala Fisika
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Abstract

The sound pollution due to noise is a one clasical problem in Indonesia. Theloudness can be reduced using the accoustic absorber. The composites of coconut fiberhas potential application as an environmental friendly accoustic absorber which is usingan agriculture waste. We reported the preparation of composite of coconut fiber as amatrix material and fenol formaldehide served as binder (coconut fiber/FF composite).The  immersion of coconut fibers  in the NaOH solution of 2% for 4 hours were caried outpriorly for improving the strengthness.The absorption coefficient (α) of the preparedcoconut fiber/FF composite was observed using two microphone impedance tube method(ISO 10534 – 2 dan ASTM E1050 – 08.   The value of tested absorption coefficient (α) allof composites samples have fulfilled the requirement. Requirement of acoustic absorbervalue of α is more than 0,15; and all of composites samples fulfilled the requirement onfrequency 752 Hz - 6400Hz.  Keyword : absorption coefficient, acoustic absorber, composite, coconut fiber, fenolformaldehid.

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