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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 7 Documents
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Search results for , issue "Vol 9, No 1 (2006): Berkala Fisika" : 7 Documents clear
PEMODELAN TOMOGRAFI CROSS-HOLE METODE GEOLISTRIK RESISTIVITAS (Bentuk Anomali Silindris) Prabowo, Riza Eka; Yulianto, Gatot; Nurwidyanto, M. Irham
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

            Cross-hole method using an amount of electrode were placed downhole is one of tomography method. Cross-hole tomography method delineate the geological conditions of the earth surface therefore it takes an important rule in the case of anomaly monitoring. The buis concrete planted in subsurface with deepness of about 1 m were used as the source of anomaly. Tomography cross-hole data with configuration such as pole-pole, pole-bipole, bipole-pole and bipole-bipole array were taken with the depth of the borehole is 1,2 m. The space variation of one electrode to another in the hole of drill is 0,2 m, 0,4 m, 0,6 m and 0,8 m for the configuration of pole-bipole, bipole-pole and bipole-bipole. Res2Dinv program obtained the images of bipole-bipole better than the images of other configuration. While the pole-pole configuration had the worst images compared to others. It is caused by two remote electrode of pole-pole array while bipole-bipole array do not have ones. Key words: cross-hole, tomography, borehole, remote electrode
PENGARUH POLARITAS MEDAN LISTRIK EKSTERNAL DAN SUDUT POLARISASI LASER DIODA UNTUK PENGAMATAN EFEK KERR Wibowo, Hari; Sugiyanto, Eko; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An identification of non linear optics of some material has been carried out. The samples used here are mineral water, salt solution, and sugar solution for various concentrations. A static applied external field E is adjusted to left and right direction. And also, the direction of electric field of laser is varied against E. The magnitude of E used in the experiment is produced by a DC high voltage (0-10 kV) applied on two identical parallel plates. A source of light to the samples is a diode laser of 645 nm and 5 mW. The change of polarization angle of laser b after through the samples is the optical property to be identified. Both of mineral water and salt solution, the effect of polarity of E shows identical results of b vs. E. In case of sugar solution, we obtain a positive gradient for right polarity and negative gradient for left polarity of E. Key words: non linear optics, polarization, polarization angle, Kerr Effect
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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Abstract

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 Alat Ukur Konduktivitas Panas Bahan Dengan Metode Needle Probe Berbasis Mikrokontroler AT89S52 Syaefullah, Rakhmat; Yulianto, Gatot; Suryono, Suryono
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A device for measuring thermal conductivity of  homogen materials using a Needle Probe method has been designed. This method uses a metal rod which emited a heat stream and a temperature sensor placed in the middle of interior heater at probe to measure changes in temperature inside the probe.            This measuring instrument represent development digitally from measuring instrument which have been made with analog system. With AT89S52 microcontroller application as data processor bases, temperature detected can be presented by sevent segment which have been controlled by BCD converter. Basically thermal conductivity measuring instrument with this Needle Probe method represent a digitally thermal detecting system which attached at Needle Probe. Every increase 1 0C, the temperature censor give output equal to 0.01 V with correctness of  displayed equal to 1 0C and error point level equal to 0.01 %. Key word: Needle Probe method, ADC, AT89S52 microcontroller, seven segment.
Rekayasa Bahan untuk Meningkatkan Daya Serap Terhadap Gelombang Elektromagnetik dengan Matode Deposisi Menggunakan Lucutan Korona Gunawan S.K., Vincensius
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The aim of this research is to engineer soft steel  which have low value absorbance of electromagnetic waves become  a material which have higher value absorbance.  The method used is deposition by corona discharge. Corona discharge generated in free space will ionisize air producing nitrogen ion that can be deposite in basic material.  This process will increase the density in the surface of basic materials and then will make the value of linear absorbance constant of basic material become higher.  The optimal result in this research is the raise of  the value of linear absorbance constant by 54,3 % with the time of deposition in 30 minutes, the voltage of electrode 5 kV and  distance between electrodes 6 mm.
Disain Peredam Suara Berbahan Dasar Sabut Kelapa dan Pengukuran Koefisien Penyerapan Bunyinya Khuriati, Ainie; Komaruddin, Eko; Nur, Muhammad
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

research aims to determine sound absorption of absorber materials making from coconut coir composites. Absorber material have been made with different composition from coconut coir composites.             Twelve samples have been made. One of samples is natural coconut coir and the other are made from coco fiber and coco peat with certain compositions. From 12 samples, 10 samples have been tested. Absorption coefficients was measured by impedance tube method with ASTM E-1050:1990 standardization.              The experiment results show that coconut coir is up to standard for absorber material according to ISO 11654 , that is with weigthed absorption (aw) over 0,15.  Weigthed absorption of samples are, A:0,30; B:0,44;C:0,27;D:0,44; E:0,51; F:0,44; G :0,47; H:0,49; I:0,31;J:0,41.  So samples A,B,D,E,F,G,H,I and J can be classified in class-D while sample C in class-E.   Absorber materials that have been made are also compatible with marketed products.  The best composition for absorber was mixture of coco dust and coco fiber.  Improving amount of coco fiber improve maximum absorption.  Adding air cavity between samples and wall improve absorption.  Improving mass density of sample making with similar total mass of composition and similar glue improve absorption in low frequency.   Keyword: coconut coir, coco fiber, coco peat, sound absorber, impedance tube, absorption coefficient, pore.
Penentuan Dosis Gamma Pada Fasilitas Iradiasi Reaktor Kartini Setelah Shut Down Prasetyowati, Risprapti; Azam, Much.; Firdausi, K. Sofjan; B. S., Edi Trijono
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of gamma dose after reactor shut-down around the kartini reactor core have beeb done. The measurement was done at the Lazy Susan (Rotary Rack) and outside the reflector wall which could be used as irradiation facility. Determination of gamma dose was carried out using wide range dosimeter consisting of a Geiger muller detector end a surveymeter. Detector was directed to outside wall reflector and lazy susan through the dry irradiation facility. Measurement was done after shut down for 3 hours with power of 100 kW and interval of ± 5 minutes. The resulting dose rate in reflector wall without neutron source was 1,2 to 0,2 kR/hour and cumulative dose in a 205  minute period was 2,21 kRad. In reflector wall with neutron source was 6  to 0,2 kR/hour and cumulative dose in a 202  minute period was 2,25 kRad.  While in lazy Susan dose rate of 60 to 2 kR/hour and cumulative dose was 42,70 kRad in 203 minutes decay. Gamma decay constant in reflector wall without  neutron source was 0,008 per minute, with neutron source 0,013 per minute. While in lazy Susan gamma decay constant was 0,014 per minute. Keywords : dose, gamm, core and  reflector, reactor

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