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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 1 (2007): Berkala Fisika" : 8 Documents clear
Estimasi Arah Strike menggunakan Metode Resistivitas Konfigurasi Persegi Cahyono, Agung; Yulianto, Gatot
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The sounding square array resistivity method had been used to estimate strike orientation in a sub surface anomaly model. The advantage of square array are more sensitif in an anisotropic medium such as strike than inline array. Strike is an important factor to placed an array configuration in resistivity method. The array commonly lay down paralel or perpendicular with a strike depend on anomaly structure. The mapping square array was used to detect the model anomaly.The sounding square array were measured by rotating array with azimuth ,,, and . The sounding square array had an electrode spacing 1 m, 1,4 m, 2 m and 2,8 m. Azimuthal apparent resistivity was  obtained by calculation and then was plotted into Rossete diagram. The estimation of strike orientation was determined perpendicularly from maximum azimuthal apparent resistivity. The mapping square array used 10 m array spacing with 1 m electrode spacing. The Wenner array used 5 m with 0,5 m electrode spacing.Strike orientation was estimated on N 90 E. This estimation was based on result each electrode spacing on the sounding square array. The existing model anomaly were detected on 5 m until 7 m on mapping square array. The result of Wenner array modeling showed that anomaly model was detected on 2,5 m until 3,5 m on N 40 W. This result showed that the sounding square array can be applied to determine strike orientation which usually exist on geological structure Keywords: square array resistivity, strike,azimuth
Analisis Fenomena Elektrohidrodinamik pada Permukaan Minyak Silikon Menggunakan Plasma Lucutan Pijar Korona Positif Rahayu, Sri; Azam, M.; Triadyaksa, Pandji; Nur, Muhammad
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The aim of this research is analysis electrohydrodynamic phenomenon deformation of oil silicon surface by technology of positive corona glow discharge plasma which generated by plasma generator system with point-to-plane electrodes geometry configuration. Variation of voltage and distance between electrodes had been treated to surface of silicon oil. Electrohydrodynamic phenomenon deformation in this research is caused by polarization and ion wind. Ionic wind would be happened if applied voltage over the corona threshold that was 2.6 kV. Graph current of saturation corona unipolar for variation voltage, being formed semi-parabolic equation while the variation of distance between electrodes, being formed linear equation. The hole diameter at variation voltage was influenced by electrics field intensity and momen dipole strength. The hole diameter at variation of distance between electrode was influenced by parabolic angle of electrics line field. The oil velocity for back to initial position is different. Velocity would be go down if the voltage progressively go up and velocity would be go up if the distance between electrode progressively go up.
Kajian Fisis Radiasi Plasma Terhadap Organ Daun pada Pertumbuhan Awal Tanaman Anggrek Phalaenopsis amabilis [Physics Observation of Plasma Radiation for Leaves to Initial Growth of Phalaenopsis amabilis] Nur, Muhammad; Setiari, Nintya; Azam, Much.; Selawanti, Ika Indah
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The Phalaenopsis amabilis (”anggrek”) has been irradiated by nitrogen ions for growth  accelereting.Irradiation technique used corona plasma technology that its electrodes configuration was point-to-plan geometry to generate nitrogen ions in air. Corona glow discharge Plasma has been generated by DC Voltage of 3.50 kV and current was 0,23 mA.  Nitrogem ions that were irradiated to Phalaenopsis amabilis (”anggrek”) have been bombarded to  leaf organ during 1 to  7 minutes. We used two types Phalaenopsis amabilis control:  control with fertilizer and control without fertilizer. Growing of Phalaenopsis amabilis  can be accellereted about 90 % compare with control without  fertilizer and 30 % compare with control with fertilzer. The maximum growing of Phalaenopsis amabilis by using plasma technology for time irradiation of 1 or 2 minutes.   Key words  : corona glow discharge plasma, Phalaenopsis amabilis (anggrek), nitrogen, ion electrons,  free radicals.
Penentuan Kandungan Unsur Aluminium, Mangan dan Silikon dalam Air Sungai Code Terhadap Waktu Sampling dengan Metode AANC Hanim, Alfia; Azam, Much.; Hidayanto, Eko; Nuraini, Elin
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An element determination which implied in river Code water below dr. Sardjito brigde with time variation was carried out using fast neutron analysis activation. Water river had been taken away from some dot later mixed, condensed by using an electrical stove from 500 ml to 7 ml. The sample then were iradiated by 14 MeV neutron from neutron generator and then were analyzed by gamma spectrometries.  The qualitative results shown that samples contents Al, Mn and Si. The quantitatively rate of element for aluminium is between 39,50-128,43 ppm, mangan between 71,54-182,80 and silicon between 19,12-84,53 ppm. Key words: FNAA, analysis element contents, Neutron Generator
Efek Magneto Optis pada Lapisan Tipis (ZnO) Adi, Muhamad; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The magneto optics phenomenon on a thin film has been observed using Michelson Interferometer. The transparent materials used in the experiment is a cover glass (thickness of 1 mm) coated by the thin film ZnO (Zincite) in 54 mm of thickness. An external magnetic field which is applied to the transparent materials is in the order of 184,95 mT  obtained by a coil inserted by a soft magnet and given by the alternating current. To obtain the change of refractive index, an Michelson Interferometer has been used using He-Ne laser with = 632,8 nm and output power of 1 mW. The change of phase or refractive index of ZnO is very clearly shown by the increasing of number of fringes as the magnetic fields increases. The order of the linear coefficient magneto optics is 10-10 m/V indicates that it is very reactive to a external applied field. Keywords: Michelson Interferometer, Non-linear Optics, Refraction Index and Linear Magneto-optic Coefficients
Analisis Geometri Akuifer Dangkal Mengunakan Metode Seismik Bias Reciprocal Hawkins (Studi Kasus Endapan Alluvial Daerah Sioux Park, Rapid Creek, South Dakota, United State of America) Listiyani, Fenti; Yulianto, Gatot
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Data processing of refraction Seismic with reciprocal Hawkins method have been done by using the secondary data in area of Sioux Park, Rapid Creek, South Dakota, United State of America which  has geology structure of alluvial sediment. The sediment Alluvial has the form of water carrier rock precipitated by Rapid Creek. The result of this research are: first layer with velocity vary from 268 m/s to 347 m/s consist of clay  functioning as covering layer, the second layer have velocities 939 m/s-1829 m/s, depth 0.28 m-3.43 m and thickness 0.26 m-4.40 m, lapped  over from clay, sand, and gravel functioning as carrier coat irrigate or coated acquifer and the third layer, have velocity 1874 m/s-2216 m/s lapped over from stone napal, acts as waterproof coat (impermeable). These acquifers are unconfined aquifer. Keywords: acquifer,  seismic refraction, ground water
Penentuan Kandungan Unsur Krom dalam Limbah Tekstil dengan Metode Analisis Pengaktifan Neutron Khaerani, Nina; Azam, Much.; Firdausi, K. Sofjan; Soeleman, Soeleman
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A determination of chromium which consisted in textile cesspool one of the company of textile residing in Ungaran using neutron activation analysis method.The sample has been threated in the form of sediment sample and liquid sample. The sample then an irradiated by Lazy Susan irradiation facility at Kartini reactor for six hours and then  the counting is done by HPGe detector for 300 seconds. The qualitative results shown that samples contents Cr-51. The quantitatively sediment sample chromium element rate equal to 491. 67 ppm and liquid sample chromium element rate equal  to 0.011  ppm Key words: Neutron Activation Analysis, irradiation.
Review Probabilitas Menemukan Elektron dengan Fungsi Gelombang Simetri dan Antisimetri pada Molekul Yusron, Moh.; Firdausi, K. Sofjan; Sumariyah, Sumariyah
BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The probability density of  and  for the symmetry and asymmetry wave function respectively, for  ion has been simulated. The  and  wave function have been obtained through the solutions of one dimensional time-independent Schrödinger equation.  The  and  are formed then by linear combination of individual solution of wave function of hydrogen atom. The probability density is calculated and simulated for several values of inter nuclear distance in Bohr radius, using Matlab 6.5. The interpretation of  shows that the probability in finding the electron in the space between inter nuclear distance of 0,2 is very small for asymmetry and very large for symmetry wave function. If the inter nuclear distance is made larger in several , the probability becomes smaller. The probability density is just equal to individual in finding electron in a hydrogen atom. Key words: The probability density, symmetry and asymmetry wave function, the  ion.

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