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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 7 Documents
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Search results for , issue "Vol 12, No 3 (2009): Berkala Fisika" : 7 Documents clear
Cover Juli 2009 Juli 2009, Cover
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cover Berkala Fisika, Vol. 12, No. 3, Juli 2009
Respon Berbagai Bentuk, Ukuran dan Bahan Elektroda Pada Pengayaan Elektrolisis Tritium dalam Sampel Air Hidayanto, Eko; Tjahaja, Poppy Intan; Arif, Idam
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Experiments were carried out to investigate the effects of various forms, sizes and materials of electrodes in the electrolytic enrichment for the determination of tritium concentration in water sample. Electrodes were made in several forms: square plate, cylinder and spiral. The electrolytic enrichment was carried out by conducting electric current to the electrodes in electrolytic cell at 150C filled with water sample, until the water volume is reduced to 10% from the initial volume. The concentrated water were then mixed with scintillate solution, and then counted using Liquid Scintillation Counter (LSC). The results show that the appropriate electrodes is nickel square plate with the recovery fraction and the enrichment factor respectively are 73.73% and 7.373
Analisis Spektrum Atomik dalam Penentuan Temperatur Eksitasi, Temperatur Elektronik dan Densitas Elektron Plasma Argon Nur, Muhammad
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of excitation temperature, electron temperature and density of electron has been done through analysis of the atomic spectrum. Atomic spectrum emitted by the argon plasma with a pressure of 1 MPa. Plasma generated in a corona glow discharge reactor. Excitation temperature (Texc) was obtained by using the Boltzmann distribution and the plasma was assumed to occur in Local Thermodynamic Equilibrium (LTE). Electronic temperature (Te) was obtained by using Saha distribution and taking the ratio between the intensity of the observed spectrum (integrated in the frequency interval) with continuous intensity was observed (not integrated). From the two temperatures, and using the Saha distribution, the density of electron/ion (Ne = Ni) can be determined. Argon plasma which was in LTE condition with a pressure of 1 MPa, Texc = 2877.70 K, Te = 21266.54 K and Ne = Ni = 4.60 x 1021 cm-3 were  obtained   Keyword: Excitation temperature, electron temperature, density of electron, atomic spectrum, corona glow discharge, Boltzmann distribution, Saha distribution, Local Thermodynamic Equilibrium
Konduktivitas Listrik Pulp Kakao dengan Fermentasi dan Pengenceran Sugito, Heri; Mujasam, Mujasam
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Relation between hydrogen ion exponent (acidity) cacao pulp with energy pass electrics (conductivity) checked to know how ability of cacao pulp at various level of hydrogen ion exponents in sending electrics and also how relation between cacaoes pulps hydrogen ion exponents ably energies pass the electrics.Research done by two treatment that is prose process and fermentation of thinning of cacao pulp. Its way beforehand look for resistivity value (ρ) from cacao pulp. From the resistivity value obtained by conductivity value (σ) cacao pulp. If connected between cacaoes pulps hydrogen ion exponents with energies pass the electrics out of two the treatment, the result is progressively low degree of acidity of cacao pulp, energy pass the electrics is progressively decline.Relation between hydrogen ion exponent with electrics conductivity at cacao pulp at fermentation process yield equation = 2,84782 + 1,01789 e [-(x-2,5)/0,626)] and at thinning process yield equation σ = 3,13506 + 0,46513 e [-(x-2,5)/0,20194). On file energy at cacao pulp is known that longer ammeter galvanometer network is attached smaller the electric current so that the energy still be small.
Aplikasi Plasma Lucutan Berpenghalang Dielektrik pada Peningkatan Kualitas Air dengan Mengalirkan Air secara Langsung dalam Reaktor Berkonfigurasi Elektroda Spiral-Silinder Muhlisin, Zaenul; Oktiyana, Wulandary; Nur, Muhammad
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A dielectric barrier discharge plasma reactor has been realized and characterized with air source as a working gas. Ozone and dissolved ozone concentration were measured at various voltages (4 to 8 kV), treatment time ( 1 to 5 minutes), water flow rate 4.167 l/min and different air flow rates (1.5 and 2.5 l/min). And the other hand, for understand the ability of ozone to improve water quality, dissolved oxygen has been measured at various voltage (3.6 to 5.2 kV) and after treatment time (until 90 minutes). Spiral electrode is made by copper wire with circumference length 500 mm and diameters 1 mm, while cylindrical electrode is made from aluminum foil with 450 mm in length. Aluminum foil is stuck at inner wall of PVC tube with 500 mm in length and diameter 1.25 inch. Pyrex is used as dielectric material, with length 500 mm, inner diameter 10 mm and thickness 1 mm The result show ozone is produced have maximum concentration 15.613 ppm and dissolved ozone have maximum concentration 10.305 ppm. As a whole ozone concentration higher than dissolved ozone concentration. Both of ozone and dissolved ozone concentration increases by increase of the voltage applied, increases by increase treatment time and increases by decrease of the gas flow rate inside the reactor. Command dissolved oxygen increases with the increase of the high voltage applied and increases after dissociation ozone in water. Key Words : spiral cylindrical electrode, dielectric barrier discharge, the ozone concentration, the dissolved ozone concentration, dissolved oxygen
Pemanfaatan Teknik Lissajous untuk Mengetahui Korelasi antara Kandungan Air terhadap Sifat Dielektrik Tanah (Studi Kasus: Sampel Tanah Permukaan di Sekitar Kota Purwokerto) Sehah, Sehah; Nur Aziz, Abdullah; Irayani, Zaroh
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The equipment has been designed to measure the dielectric properties of soil samples with lissajous technique in Basic Physics Laboratory, Study Program of Physics, Faculty of Science and Engineering, University of Jenderal Sudirman, Purwokerto. The equipment has been used to measure the dielectric constant of 19 soil samples taken from several locations in area of Purwokerto city and its surrounding, at a frequency of 100 kHz. The measurement has been conducted on soil samples with the variation of soil mass water content. The results obtained indicate, the existence of a correlation between the dielectric constant of soil samples to the soil water mass content (h) which can be expressed with two equations; dielectric permittivity e = 0.3176 h-2.5555 with a correlation coefficient R2 = 0.9538, and dielectric loss equation e'= 0.00003 h -5.3336 with a correlation coefficient R2 = 0.9513.
Simulasi Pencitraan Ultrasonografi (USG) Menggunakan PdeTool Matlab Anam, Choirul
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Diagnostic imaging with ultrasound is based on the mechanical properties of an object. To evaluate how the ultrasound wave propagates in an object and imaging of the object, can be done with simulation techniques. Simulation of ultrasound wave propagation was performed using Matlab pdetool. The simulation was conducted to determine the image quality due to the influence from variation of the object, variations in the number of objects, various types of objects and variations in frequency of the signal. From the simulation showed that the ellipse and box objects can be distinguished. If the number of object is increased, will cause the image more complex. This happens because the waves are about an object, it would interfere with ultrasound waves that will be used to image the next object. If two objects have different c is high enough, then the imagery on the field boundary of two mediums was very clear. Conversely, if the difference is very small c, then the boundary of two mediums were not visible. If the frequency rises, causing axial resolution increase, but cause increased attenuation.   Keywords: USG, Simulation, pdetool Matlab

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