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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 8 Documents
 1 
Search results for , issue "Vol 10, No 3 (2007): Berkala Fisika" : 8 Documents clear
Simulasi Numerik Osilator Harmonis Edi Widodo, Catur
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A program for explain movement the harmonis oscillator have been done with Python programming language version 4.2. Program was simulated simple harmonic oscillator and damped harmonis oscillator.Program was constuct by mean finite difference equation in object oriented programming Python. First, object simulation is simple harmonic motion consist spring and mass slides on a frictionless horizontal surface. Second, object simulation is damped harmonic motion consist spring, mass and piston. The result of simulation indicated that the frequency osilation depend with force constant of the spring and mass, and damped depend damping ratio and mass.  
Pembuatan Hologram Refleksi Arifah, Arifah; Firdausi, K. Sofjan; Azam, M.
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
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Abstract

A Reflection hologram of a white ceramic object has been made on 5000 lines/mm PFG-03M holographic plate. A He-Ne Laser is used to record the holograms. And to reconstruct, it is used white, blue, and yellow light. The holographic plate for making of reflection hologram is PFG-03M. The optimal exposure time lies between 8 and 10 seconds. By reconstruction image white LED, it shows that the image is formed clearer than using blue and yellow light.   Keywords:  holography, reflection hologram, reconstruction, exposure time.  
Penentuan Tebal Bahan Transparan (ZnO) Menggunakan Interferometer Michelson Edy Nugroho, Sulung; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
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Abstract

Thickness’ determination of ZnO material on a substrate (microscope slide) by using Michelson Interferometer has been carried out. The material used in the research was ZnO transparent material deposited on a 1 mm-thickness of a microscope slide.  Refractive index of the microscope slide and the thickness of ZnO were measured by counting the fringes transitions as the materials rotated large as , on the other words, fringes transitions   as function of sinus incident angles  of laser ray, .  Incident angles of laser ray, which are used in the measurement of  ZnO transparent material thickness on microscope slide, are 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, and 10°.  Laser ray used in this research was He-Ne laser, which has 633 nm and its output power was < 1 mW. The results of this research show that there were  fringes transitions as research-materials rotated large as .  The measured fringes transitions still have remarkable agreement with the theoretical fringes transitions.  As the incident angles increases, the fringes transitions  will increase as well as.  The thickness of the ZnO thin film, which is resulted from the research, is equal to (6.0 ± 1.8) × 10-5 m.
Rancang Bangun dan Pengujian Sistem Reaktor Plasma Lucutan Pijar Korona guna Mempercepat Pertumbuhan Tanaman Mangrove Triadyaksa, Pandji; Nur, Muhammad; Nasrudin, Nasrudin; Wasiq, J.
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Plasma glow discharge corona reactor system has been made and tested to stimulate mangrove growth. Plasma glow discharge corona reactor consists of DC high voltage system and point to plate electode system. Reactor performance test has done on Rhizophora apiculata mangrove species. High voltage system mainly develop using TV fly back that been triggered by pulsed frequency using oscillator circuit. Point to plane electrode system was designed to maintain two electrode range remains 3 cm with number of point electrode plugged parallel with plane electrode are 63 pieces. Plasma glow discharge corona reactor tested  was done on radiation process of mangrove seed by divided sample groups into 6 sample which have different time radiation and 1 sample that not been radiated as a control data. Mangrove growth was analyzed by measure the growth of mangrove plumulae after 17 days of cultivation. Research results shows that in developing plasma glow discharge corona to radiate mangrove, plasma reactor system works in 8 kV DC plasma voltage development. Mangrove growth after 6 time variation of plasma radiation shows a good effect of growth stimulation along with longer radiation time duration.  The increase of mangrove growth was hypothetically caused by an increase of nitrogen concentration in mangrove seeds because of ion nitrogen fixation in the seeds during plasma radiation process
Efek Magnetooptis Pada Lapisan AgBr Terekspos Sulistyo, Respita; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The non linear optic characteristic from several transparent medium (film plate and glass) under influence of external magnetic field and variation of wavelengths, have been identified. In this experiment, the developed AgBr film is deposited on a hologram. The magnetic field has been produced by coils which connected to slide regulator (0-240V). The maximum value of magnetic field is about 182,0 mT. Light sources used are He-Ne Laser with a wavelength of 633 nm and 1 mW in power, and green laser pointer with a wavelength of 532 nm and power less than 5 mW. The optical characteristic measured in this experiment is the rotation of electric field, of the transmitted laser beam due to applied external magnetic field to the medium. The experiment result shows that  is dependent linearly on magnetic fields. The Verdet constant is proportional with wavelength of the light. Measured values for Verdet constant (V) at 632,8 nm is (0,487300,00070) min/G-cm and at 532 nm is (0,261700,00056) min/G-cm for glasses material and the values for Verdet constant at 632,8 nm is (0,328500,00060) min/G-cm  and at 532 nm is (0,156900,00039) min/G-cm for film plate.   Key words:Magnetooptical effect, non linear optic, Verdet constant
Rancang Bangun Sistem Pengukur Konsentrasi Larutan Tembaga Sulfat (CuSO4) Menggunakan Komputer Sumariyah, Sumariyah; Endro Suseno, Jatmiko; L, Fitria
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A system  of    Sulphate Copper (CuSO4) liquid consentration measurement by using compute has been made. The display of it through monitor in the computer with the limitation of measurement  0.1 M to 1M. The main components of the measure system of   Sulphate Copper (CuSO4) liquid consentration are : tungsten filamen light which include in the sample and photodioda light sensor also IC 741 as a Operational Amplyfier to strengthen the tension of sensor output. As the chage of the output analog signal power tobe digital signal ADC 0809 is used. And also as an interfce which is the pheripheral instrument of communication equipment with computer is used PPI 8255. The software on  this measure system uses Turbo Pascal version 7.0. This system had been realized and can measure the Sulphate Copper (CuSO4) liquid consentration wich the linier regresion equal is , with X hole is the sample consentration (M) and Y hole is the measure result of the concentration (M) and the deviation is 0.0326.
Sifat Optis Aktif Air dalam Medan Magnet pada Frekuensi Resonansi 50Hz-60Hz Firdausi, K. Sofjan; Lego, Dro Dwi; Sugito, Heri
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The interaction between external magnetic field modulated at 50-60 Hz and the dipoles of the sample induced by laser light modulated at 50-100 Hz has been studied. The magnetic field has the maximum value of 170 mT produced by a coil of 810 in turns. The source of light of 632,8 nm and 532 nm is modulated at the resonance value between 30 Hz and 100 Hz. The optical characteristic behavior studied in this research is the change of polarization E-direction of laser light in the aquades samples against the influence of external magnetic field. The result of experiment indicates that the change of laser polarization angle is linearly proportional with the increaseasing of modulated frequency and external magnetic field in sample materials. It is shown that the change of glycerine concentration changes also linearly direction of polarization. The verdet constants measured in the experiment for 632 nm and for 532 nm equal to (0,026 ± 0,005) V (min/g-cm) and (0,025 ± 0,003) V (min/g-cm), respectively. Key words: change of polarization, external magnetic fields, resonance frequency
Interpretasi Bawah Permukaan Dengan Metode Self Potential Daerah Bledug Kuwu Kradenan Grobogan Dwi Indriana, Rina; Nurwidyanto, M. Irham; W. Haryono, Kurnia
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The geophysics research to observe the subsurface anomaly in Bledug Kuwu had been done. It was used to analyze and interpret the potential data. The purpose of this research was to interpret the object of subsurface anomaly. The research was used self potential method with base point electrode configuration. Data processed used Surfer 8 software, which result was an isopotential contour map. The modeling processed used curve matching for a spherical model. By using Bhattacharya theory, the depth and polarization angle was founded as the parameter of a spherical model. The research’s result of the depth of anomaly origin is 19,5 m, 23,68m, and 40,8 m. The polarization angle is 70o, 70,38o and 100o.   Keywords: Bledug Kuwu, self potential, spherical model  

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