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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 369 Documents
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Pemodelan Struktur Pori Dari Batuan Geologi Dengan Fractal Ferani, S
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Has done modeling with fractal pore structure and fracture of geology rock. Sun and Koch (1998)[2] states that the geological formations of porous rock has a fractal nature ..Modeling the generated fractal porous media have been carried out, which generated fractal modeling has the potential high enough to be able to model the porous media, although the modeling parameters require optimization in order to generate fractal porous media a valid model with actual data. The studied rock samples taken from surface rock formations Parigi Cirebon, West Java. Fractal model is then validated by optimizing the parameters that appear in the modeling for valid with the data of rock that can be estimated by image analysis.   Key words: fractal, models, rock geology
Analisis Atribut Seismik untuk Identifikasi Potensi Hidrokarbon Maulana Hadi, Johan; Nurwidyanto, M. Irham; Yulianto, Gatot
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
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Rms amplitude and spectral decomposition attribute have been extracted for hydrocarbon potential identification in Amandah area, Talangakar Formation, North West Java Basin. Purpose of rms amplitude extractions is to see the change of lithology which is extreme. Example is like reservoir existence. Spectral decomposition has been used to see reservoir at thin thickness. The seismic attributes has been extracted from seismic data 3D Pre Stack Time Migration (PSTM). Log data has been taken from a well (AMD-01) to interpret and determine reservoir thickness in interest zone. Seismic attribute analysis has been used to see existence and shape of channel’s geometry spreading. The result of rms amplitude attribute extraction is reservoir which can be detected clearly at 10 ms, 20 ms, 30 ms and 40 ms window analysis. Whereas the result of spectral decomposition attribute extraction is reservoir which can be detected at 15 Hz – 25 Hz frequency with 30 ms and 40 ms window analysis. The result of rms amplitude and spectral decomposition attribute analysis shows hydrocarbon in Amandah area, Talangakar Formation is potential in channel depositional facies with depositional direction at north-south (N-S) and north nort east – south south west (NNE-SSW) and  thickness high of channel is concern at 36-60 m.   Key words: Seismic attribute, rms amplitude, spectral decomposition, reservoir,
Cover April 2009 April 2009, Cover
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
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Abstract

Cover Berkala Fisika, Vol. 12, No. 2, April 2009
KAJIAN AWAL SIFAT OPTIS TAKLINIER BAHAN TRANSPARAN DALAM MEDAN LISTRIK STATIS Prabowo, Krisno; Firdausi, K. Sofjan; Azam, Much.
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
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In this paper, we study non linear optical characteristics of some transparency media in a static external electric field, E. The samples used in this experiment are mineral water, salt solution, and sugar solution. The optical characteristic investigated here is the change of polarization angle,b, of laser He-Ne after pass through the sample, against E. The strength of electric field is produced by high voltage (0-2000 volt) applied on two parallel plates (size 28 × 28 cm2). It is assumed that E inside the plates is homogeneous and fulfilled by relation of E = V/d. Results of experiment show that three samples have the tendency of b µ E in this experimental condition assumed to be optimal. For weak (mineral water) and strong (salt solution) electrolyte solution, we obtain a significant difference of gradient, that shows how dominant the electric dipoles in salt more than in mineral water. Other wise, change of b vs. E in sugar solution has only significant initial value of b. The tendency of b µ E is just only due to the contribution of dipoles of water molecules in sugar solution, since the sugar molecules is non polar.
RANCANG BANGUN SISTEM PENGENDALI TEMPERATUR DENGAN PROPORSIONAL, INTEGRAL DAN DIFERENSIAL (PID) BERBASIS MIKROKONTROLER ARDUINO UNO Noviyani, Siti; Sumariyah, Sumariyah
BERKALA FISIKA Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019
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The aim of this research was to realize a design of a temperature control system with the proportional-integral-differential (PID) based on the Arduino Uno microcontroller, and toanalyz e the PID to the system. The PID control method was designed by identifying plants using the Ziegler-Nichols method to determine PID parameters consisting of proportional constant (Kp), integral constant (Ti), and differential determination constant (Td). Hardware design consisted of the Arduino Uno microcontroller which is open source with PID and pulse width modulation (PWM), and it can be control with feedback in the form of temperature sensors, AC lamp generators, and AC dimmer lamps. The system was implemented using C language with Arduino IDE software. The system can be done at the best stability point with a value of Kp = 0.015, Ti = 101.52, Td = 25.38. The three parameters have their respective functions, i.e. Kp is used to small error detector, Ti is to back-up system in order to work around the set-point, and Td is to speed up the system rate.Keywords: PID, temperature, Ziegler-Nichols method, Arduino Uno
Rancang Bangun Pengatur Cermin Sebagai Komponen Gerak Interferometer Pada Spektroskopi FTIR Adi Wibowo, Wahyu; Edi Widodo, Catur; Azam, M.; Firdausi, K. Sofjan
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Michelson's interferometer and mirror regulator system as components of its power have been designed. Interferometers stirred component is one of monotonic mirror on optic system. Interferometer is made accords Michelson's Interferometer attempt. Mirror M1 and mirror M2 is assembled mutually upright then one beam splitter placed before both of mirror. One laser light source is given before mirror M1 crosses beam splitter. There is a detector before mirror M2 crosses beam   splitter upright with laser light source. Mirror M1 is made flexible by assembled gear and stepper's motor to be able forward or backward motion then so called moveable mirror.  Stepper's motor is turned around by computer via parallel port. From interferometer engineering and mirror regulator system already been made, gotten interference pattern with ring amount that the less each mirror gets forward motion and ring amount that more and more each mirror moves to backward. Shift moveable mirror every step for forward or backward is 1,5 µm with distance sails through maximal be 6,0 mm. The in common result point out that interferometer and regulator system of moveable mirror show feature changed interference pattern along with mirror move. Key word: interferometer, moveable mirror, motor stepper, parallel port.
ANALYTICAL MODELING OF NON PLANAR MOSFET Endro Suseno, Jatmiko
BERKALA FISIKA Vol 15, No 4 (2012): Berkala Fisika
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The Non Planar MOSFET structure with curved-channel is one alternative MOSFET structure for enhance the electrical performance. The study was focused on the non planar deviceswhich has curved-channel including grooved-gate, recessed-channel, V-shaped and sidewallvertical MOSFET. The presence of corner region can effective in reducing the electric field at thedrain, thus improving reliability of short channel effects (SCEs). The corner effect can reducesurface potential. It can improve the characteristic of the device electrical performance, especiallythe reduction of short channel effect and hot carrier effects. Therefore, the curved-channelMOSFET has a very great application prospect in deep submicron device architecture.Keywords: MOSFET, Non Planar, curve channel, surface potential, short channel effects
Pengaruh Aliran Gas Nitrogen Pada Karakteristik Listrik Film Gan Yang Ditumbuhan Di Atas Substrat Silikon (111) Dengan Teknik Sol Gel Spincoating R. Tayubi, Yuyu; Rusdiana, Dadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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GaN thin films have been successfully grown on silicon substrate (111) by sol gel technique spincoating with nitrogen gas flow variation. GaN films were characterized using X-ray diffraction, SEM and electrical characteristics. The results showed that the film has a polycrystalline structure, while the electrical characterization of resistivity measurements on several samples of GaN films with the variation of N2 gas flow rate showed that the electrical resistivity of films decreased when the rate of N2 gas flow is increased.   Keywords: GaN, sol gel spincoating, resistivity.
PEMBUATAN LAPISAN FOTOKATALIS ZINC OXIDE (ZnO) DENGAN TEKNIK SPRAY COATING DAN APLIKASINYA PADA PENGERING JAGUNG Hidayanto, Eko; Sutanto, Heri; Firdausi, K Sofjan; Arifin, Zaenal
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Abstract

ZnO thin film has been deposited on the glass with a spray coating technique. Gel of ZnO 0.5 M was synthesized by dissolving 0.5 M zinc acetate dehydrate in isopropanol andmonoethanolamine solution at room temperature with the molar ratio of MEA and ZnAc is 1:1. The solution was stirred using a magnetic stirrer at 70°C for 30 minutes to get the clear and homogeneous ZnO gel. ZnO gel is placed on the spray hole and sprayed on a heated glasssubstrate till 40oC. Then, the spraying layer spraying was allowed to stand for 3 days tostrengthen the contact with glass layer. Deposition results of ZnO layer is transparent withtransmittance values of 71.4 % and decreases with a decrease in wavelength imposed on the layer.The energy dispersive X-ray (EDX) results show the composition of zinc (Zn) is less than theoxygen (O) with a ratio Zn : O = 38.44 % : 61.56 %. The scanning electron microscopy (SEM)results show ZnO thin film has a smooth and homogeneous surface with a grain size of 57 nm. Thetest results demonstrate ZnO layer has a band gap value of 3.01 eV. The drying corn shows thatdirectly drying using sunlight has a faster rate compared using ZnO glass. Surface morphology ofthe layer of dried corn using ZnO glass has brighter color and lice compared to directly drying onsunlight.Keywords: Photocatalyst, ZnO, Thin Film, Spray Coating, Corn, Drying
Mekanisme Hamburan Defek Statis Dan Vibrasi Termal Terhadap Mobilitas Elektron Pada Film Tipis GaN Rusdiana, Dadi; Hasanah, Lilik; Suhendi, Endi
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

Electrons Mobility in GaN thin films has been determined for temperature variation using approach method to the relaxation time due to the influence of static defect scattering and thermal vibrations. The simulation results show that electron mobility is strongly influenced by environmental temperature, except for the scattering of neutral impuritas type that does not affect the value of the charge carrier mobility even though the external temperature was varied.   Keywords: Electrons Mobility, defect static, thermal vibration

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