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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
 1 
Search results for , issue "Vol 12, No 4 (2009): Berkala Fisika" : 7 Documents clear
Pembangkitan dan Pemulihan Citra Biner Markov Random Field (MRF) secara Stokastik Dengan Algoritma Markov Chain Monte Carlo (MCMC) Adi, Kusworo; Bayu Suksmono, Andrian
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Ising model or the Spin Glass is a model used to solve the magnetic properties of materials and the occurrence of phase transitions from paramagnetic to ferromagnetic properties. Magnetization of the material comes from the vortex that has two kinds of electron spin, ie {-1 / 2, +1 / 2}. Both spin gives the direction of magnetization (North-South) that opposite. Two-dimensional Ising model (2D), often called a Markov Random Field (MRF). This model is a stochastic model that can represent the image texture. Result binary image generation MRF much affected by changes in temperature, the spin direction will be random if the environment inside a high enough temperature, ie above the critical tempertaur (or Currie temperature) Tc, at this kedaan paramagnetic material. Conversely, if the environmental temperature below Tc, then the material would be ferromagnetic. As for binary image restoration MRF is affected by noise levels and the number of iterations, the best results the image restoration process at the level of noise from 0 to 0.5.   Keywords:  image restoration, markov random field, stochastic
PEMBUATAN SOFTWARE PENCATAT PENGUNJUNG PERPUSTAKAAN MENGGUNAKAN BARCODE DAN MYSQL BERBASIS BORLAND DELPHI 7.0 Apriana, Apriana; Danusaputro, Hernowo
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The library visitors counter system using barcode and MySQL based with Borland Delphi 7.0 has been done for ease in counting the visitors in a library and data to be displayed more accurate and comprehensive. Bar code which printed on visitors card is aimed at barcode scanner to read the code of the identity of visitors who will enter the library. At Borland Delphi 7.0 uses the pascal programming language that is integrated with the input of barcode and database MySQL able to display the time visitors enter the library. From this research it was found that Borland Delphi 7.0 software can read the records in the MySQL database and display properly on a monitor in accordance with the data stored on the visitors database.   Keywords : library, barcode scanner, Borland Delphi 7.0, code barcode, MySQL
Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY Dengan Metode Magnetik Indratmoko, Putut; Nurwidyanto, M. Irham; Yulianto, Tony
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
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Abstract

Abstract                 Acquisition of geomagnetic field has been done at Kretek, Sanden, Pundong, Bantul and Panggang, Gunung Kidul, Yogjakarta Province on 14 s/d 17 October and  7,8,9,12 November 2009 in orde to interpreted the subsurface structure. Data has been collected by Proton Precession Magnetometer (PPM) to measured  the total  intensity of magnetic field, Global Positioning System (GPS) to determine the position and geology compass to the direction of north pole.                 The raw data has been processed and performed using IGRF (International Geomagnetics Reference Field) correction to obtain total field magnetic anomaly. Upward continuation was performed at 300 meters heigh by Magpick. Qualitative interpretation was done by analyzing regional and local anomaly maps. Quantitative interpretation was done 2 ½ D modelling cross-sectionanomaly maps using Mag2DC for Windows Software.     The result of 2-D modeling produces anomaly objects was susceptibility value (0,0405) in cgs unit  for the first object, susceptibility value (0,0425) in cgs unit  for the second object, susceptibility value (-0,0085) in cgs unit for the third object. The anomaly objects had depth in +580 meters from the surface and was considered the rock which had been experience demagnetitation proses.    Key word: magnetic anomaly, Parangtritis, susceptibilities.
Kajian Teoritis Penentuan Tetapan Planck Menggunakan Model Elektrodinamika Maxwell Zaada Faidullah, Ilmy; Sasongko, Dwi P.; Priyono, Priyono
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Theory of Electromagnetism and Planck constant have important role in the development of light theory. Electromagnetism theory explains the velocity of light is constant and finite because light is phenomenon of propagation of Electromagnetism Wave. Distribution of Planck Radiation that introduces Planck constant also based on the theory of Electromagnetism, however, now light treated like as a particle. Planck constant not only radically changes concept of light but also has be main source of the birth of Modern Physics. An interesting thing to investigate connection between Maxwell equation that well known with concept of classically Physics and Planck constant, a constant that often used in Quantum Mechanics. Deriving Planck constant from Maxwell Equation can be done by understanding study of Radiation Quantization that based on the assumption. First, Electromagnetism wave is on the vacuum space so there is no charge and current. Second, Hamiltonian of Radiation stated by Hamiltonian of Harmonic Oscillation. Third, mass of Photon regarded does not affect Hamiltonian of Radiation because it is difficult to determine rest mass of Photon. Fourth, Dirac postulate used as non commutable multiplication rule of position and momentum coordinate. In this research has obtained an elaborate explanation deriving Planck constant from Maxwell equation that can be shorted as follow. From Maxwell equation will be derived Maxwell wave equation that consist of Vector Potential Fields. Its form similar with Harmonic Oscillation function so Hamiltonian Radiation can be stated as Hamiltonian of Harmonic Oscillation. By Using Dirac postulate, Oscillation Harmonics can be studied in Quantum Mechanic so will be obtained  Planck constant that contained on the Fourier Coefficient Operator.   Keywords : Maxwell Equation, Planck Constant, Fourier Coefficient Operator.
Cover Oktober 2009 Oktober 2009, Cover
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cover Berkala Fisika Oktober 2009
Aplikasi Transduser Ultrasonik Jenis Immersion Transducer Untuk Karakteristik Media Cair Dan Pengukuran Tingkat Kekasaran Permukaan Beton Sugito, Heri; Suryono, Suryono; Layla, Diana
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Research of the application of ultrasonics for liquid medium characteristic and measurement of level of surface roughness of concrete have been done using immersion transducer. This purpose of research is to know characteristic some dilutions based on the atanuasi coefficients and measure surface roughness of concretes based on time of flight. In this research applied by ultrasonic transducer with frequency of 1 MHz.  At attenuation method, awakened ultrasonic signal through pulse generator and connected at transmitter transducer. Ultrasonic wave which transmitted through liquid medium will experience received finite attenuation of receiver. Media liquid which applied is oil and cooking oil. At method time-of-flight, measurement done with object scan which turned around counted 200 rotation apply motor stepper. Object which applied as component of test that is concrete. Reason of selec,choose it this specimen is to minimize attenuation so that will enlarge the bound. Transducer will transmit modulation to object through modulation transmiter and receiver. Result from scanner is presented at CRO ( Cathode Ray Oscilosco). Research result to liquid medium sample showing existence of tendency of increase of attenuation value for ex-oil- and ex-cooking oil if each compared with oil was new and new cooking oil. From measurement of level of surface roughness, obtained by is surface roughness average yield of  concrete A ( Radium of a minimum of 10%, and Ra maximum 16%), and concrete B ( Radium of a minimum of 8%, and Ra maximum 17%). This research result give hope that this method can be developed for inspection innoxious at solid and liquid medium.   keyword : Ultrasonic, attenuation coefficient, level of crudity, Time of Flight
Koreksi Tekanan Gas Ideal untuk Plasma sebagai Materi Fase ke empat dan Penerapannya pada plasma Argon Nur, Muhammad
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Pehitungan secara analitik telah dilakukan untuk memperoleh perumusan tekanan pada plasma. Perhitungan dengan pendekatan non kuantum ini megunakan fungsi-fungsi termodinamika dalam gas seperti entropi, entalpi, energi bebas  Helmholtz, energi bebas Gibs dan fungsi-fungsi partisi partikel dalam Plasma. Perumusan yang diperoleh digunakan untuk menentukan tekanan pada plasma korona Argon densitas tinggi dan plasma Argon gelombang  mikro pada tekanan gas awal 1 atmosfer. Hasil pehitungan tekanan diperoleh perbedaan dantara tekanan gas panas dengan tekanan kondisi plasma sebesar ΔPplasma1/24π Pgas dimana tekanan pada kondisi plasma lebih kecil dari tekanan gas panas. Penerapan terhadap plasma korona argon densitas tinggi, ditemukan bahwa tekanan plasma berubah secara parabolik terhadap perubahan densitas dan tekanan plasma berubah secara linear terhadap temperatur.   Key words:Plasma. gas panas, tekanan, termodinamika, energi bebas, argon, densitas, temperatur

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