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BERKALA FISIKA
Published by Universitas Diponegoro
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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.
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Articles 298 Documents
Analisis Sudut Kemiringan Lempeng Subduksi di Selatan Jawa Tengah dan Jawa Timur Berdasarkan Anomali Gravitasi dan Implikasi Tektonik Vulkanik Dwi Indriana, Rina
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Abstract

Gravitation anomaly research had been done to predict the subduction dip and model. The gravitation research covered East and Central Java, Indonesia. Upward continuation used for regional anomaly mapping. Two dimension modeling from each cross-sectional used grav2poly or grav2dc. From 2D model subduction dip was calculated. The research result were subduction dip various between 3,40 to 8,20. There is a suggestion that low magnitude of dip correlated with volcano activity and high magnitude of dip correlated with some depresstion zone. Key word: subduction zone, subduction dip, gravitation modeling
Evaluasi Kinerja Metoda Analisis Pengukuran Neutron (APN) Arifin, Zaenal; Sasongko, Dwi P; Munir, M
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

Evaluation of Neutron Activation Analysis (NAA) methods performance has been done. The objective is to validate the data form these analysis on the determination of the trace element concentration in the waters and sediments. This evaluation covering test of devices stability, background counting, Figure of Merit (FOM), Critical Level (Lc), Detection Limit (LD), Determination Limit (LQ) and test of quality result. Result show that device in stabil condition  have background counting about 0.0037 to 0.1806 cps, Figure of Merit (FOM) about to 0.0045 to 0.1732 secon. The data result analysis above Critical Level (LC), in LC about 0.07 to 16.42 ppb. Detection Limit (LD) about 0.14 to 32.93 ppb in significant 95% expect Hg obtained LD 1.26 ppb. Determination Limit (LQ) about 0.44 to 100.10 ppb. Test of quality result show that of standardized difference about 15.17% to above 50% and Precision result analysis about 0.01% to 99.00%.   Keywords : NAA Methods, Trace element, devices stability, background counting, Figure of Merit (FOM), Critical Level (Lc), Detection Limit (LD), Determination Limit (LQ) and test of quality result.
Optimasi Tungku Sekam Skala Industri Kecil Dengan Sistem Boiler Nawafi, F; Puspita, D; Desna, Desna; Irzaman, Irzaman
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
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Abstract

Rice husk furnace  is a technology based on local wisdom to anticipate threats crisis energy. At first investigated husk stoves for cooking only in the scale of the household, but today rice husk furnace developed for industrial scale because of the importance of commercial aspects of a very promising from this rice husk furnace. In rice husk furnace also developed an industrial scale boiler system, boiler systems where it can enlarge its efficiency, in the midst of a boiler chimney pots have used, because basically rice husk furnace process is influenced by air flow. Husk furnace efficiency greatly affect the number of furnace ash which is required in the cooking process.   Keywords: rice husk, rice husk furnaces, air flow, efficiency, boilers.
Studi Sifat Termal Prekursor In(TMHD)3 Untuk Menumbuhkan Lapisan Tipis In2O3 dengan Teknik MOCVD Saragih, Horasdia; Hasniah, Hasniah; Sustini, Euis; Sukirno, Sukirno
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

The In2O3 thin films have been deposited on quartz substrate by MOCVD technique using In(TMHD)3 as a metal organic precurcor. Thermal properties of In(TMHD)3 material have been investigated by analyses of TG-DTA curve and FTIR spectrum to determine the value of In2O3 deposition parameters. Based on TG-DTA curve and FTIR spectrum analyses, we find that: (1) melting point of In(TMHD)3 powder is 175oC; (2) In(TMHD)3 powder starts to evaporate at 184oC; (3) partial oxidation of In(TMHD)3 in Ar/atmosfer accur at 260oC; and (4) dissosiation of TMHD ligand from indium metal element happened in the temperature range 300oC – 400oC. According to these results, we maintaned growth condition for deposition of In2O3: the temperature of In(TMHD)3 bubbler (Tb) = 200oC; the pressure of In(TMHD)3 bubbler (Pb) = 260 Torr; the rate of argon gas flow to carried out the vapor of In(TMHD)3 = 50 sccm; the rate of oxygen gas = 50 sccm; and temperature of substrate = 300oC. In 120 minutes, the thickness of deposited In2O3 thin films, the rate of deposition, and the roughness of film surface are about 0.2 µm, 1.6x10-3 µm/menit and 70 nm, respectively.   Keywords: In(TMHD)3 precursor, In­2O3, thin films, thermal properties, MOCVD.
Analisis Velocity Model Building Pada Pre Stack Depth Migration Untuk Penggambaran Struktur Bawah Permukaan Daerah ”x” Triarto, Yose Rizal; Danusaputro, Hernowo; Harmoko, Udi
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line KPH-11807 at “X” area. This method was chosen for reconstruction geology features and imaging the subsurface structure. Based on previous investigation which done October, 2004-January, 2005, Line KPH-11807 at “X” area was a potential development as hydrocarbon prospect area which complex geology structure and strong lateral velocity variations. In the same area has been done previously with Pre Stack Time Migration by Elnusa Geosains, PT. Therefore the result of the PSDM can be compared to PSTM method. Seismic section with complex geology structure and/or strong lateral velocity variations area, which often there are at seismic data migrated stack can be overcome using an accurate velocity model. Velocity model building with the IVMB (interval velocity model building) concept consist of the coherency inversion and global tomography yield the right subsurface geological model. Hereinafter the velocity model will be used for the PSDM (pre stack depth migration) process. Result of PSDM shows a significant image enhancement, able to assure the reflection pattern at the horizons with strong lateral velocity variations and give the more coherence resolution compared with Pre Stack Time Migration seismic data. This study is very valuable in building exploration concept and development of the area, especially in a complex structure with strong lateral velocity variations.   Keywords: PSDM, velocity model building.
Studi Konduktivitas Listrik Film Tipis Ba0.25Sr0.75TiO3 Yang Didadah Ferium Oksida (BFST) Menggunakan Metode Chemical Solution Deposition Irzaman, Irzaman; Erviansyah, R; Syafutra, H; Maddu, A; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

Has done growth Ba0,25Sr0, 75TiO3 (BST) thin film and BST are pure Ferium Oxide Fe2O3 dopant (BFST) with dopant variations 5%, 10% and 15% above the substrate Si (100) type-p using Chemical Solution Deposition Method (CSD) with the spin coating technique at a speed of around 3000 rpm for 30 seconds. BST thin films made with 1 M concentration and annealing at a temperature of 850°C for Si Substrate. Thin film on silicon substrate type-p thickness characterization performed using the volumetric method and the characterization of electrical conductivity by using LCR meter. From the characterization results showed the thickness increases with the addition of ferium oxide dopant given. Electrical conductivity value of BST and BFST thin films are in the range semiconductor materials and electrical conductivity values obtained increased when the higher intensity light is used whereas resistance value could decrease if the light intensity is increased. The addition of ferium oxide dopant will increases electrical conductivity value of BST and BFST thin films.   Keywords : BFST, thin film, CSD, spin coating, electrical conductivity
Mekanisme Hamburan Defek Statis Dan Vibrasi Termal Terhadap Mobilitas Elektron Pada Film Tipis GaN Rusdiana, Dadi; Hasanah, Lilik; Suhendi, Endi
BERKALA FISIKA Vol 13, No 1 (2010): Berkala Fisika
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Abstract

Electrons Mobility in GaN thin films has been determined for temperature variation using approach method to the relaxation time due to the influence of static defect scattering and thermal vibrations. The simulation results show that electron mobility is strongly influenced by environmental temperature, except for the scattering of neutral impuritas type that does not affect the value of the charge carrier mobility even though the external temperature was varied.   Keywords: Electrons Mobility, defect static, thermal vibration
Kajian Proses Sterilisasi Media Jamur Tiram Putih Terhadap Mutu Bibit Yang Dihasilkan Desna, Desna; Puspita, R. D.; Darmasetiawan, H.; Irzaman, Irzaman; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

Sterilization media were done in drum. Fuels LPG.is used for the fuel Efficiencies of the fuel gained in the media sterilization oyster mushrooms for 6 hours is 40.74%, meanwhile efficiencies of the fuel for 8 and 10 hours is 59.57% and 53.14%. The physical and economical research of the white oyster mushrooms sterilization process for 8 hours produces the highest efficiency.   Keywords: Medium, oyster mushrooms, LPG, sterilization 
Investigasi Bidang Gelincir Tanah Longsor Menggunakan Metode Geolistrik Tahanan Jenis di Desa Kebarongan Kec. Kemranjen Kab. Banyumas Sugito, Sugito; Irayani, Zaroh; Permana Jati, Indra
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

Investigation of landslide slip surface using geoelectrical resistivity method has been conducted at Kebarongan Village, Kemranjen District, Banyumas Regency. Data acquisition by means Schlumberger and Wenner configuration.  Data processing and interpretation were using Progress version 3.0 and Res2Dinv version 3.54 softwares.  The output of Progress software were depth, number of layers, and values of rock resistivity.  Mean while the output of Res2Dinv were resistivity section, RMS, and depth of rock layers.  The interpretation result showed that at Kebarongan village lithology consist of four layers i.e. top soil, sandy clay, wet clay and sandy clay.  Slip surface is wet clay with depth of 10.31 until 14.21 m.  The slip surface orientation is same of slope area that is to south and the type of landslide is translational.      Keywords: geoelectrical resistivity, landslide, slip surface, Kebarongan
Mikrostruktur Semikonduktor GaN di Atas Substrat Silikon Dengan Metode Sol-Gel Sutanto, Heri; Nurhasanah, Iis; Istadi, Istadi; Maryanto, Maryanto; Ambikawati, Wahyu; Marlini, Nofi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

Gallium nitride (GaN) semiconductor thin films have been successfully deposited on Si substrate (004) by sol-gel method. Gel prepared from the crystal gallium-citrate-amines. These crystals formed from a solution containing the ions Ga+3 and citric acid (CA). Gel in place on the substrate and then rotated with a speed of 1100 rpm. The gel layers are obtained and then placed on the programmable furnace. Deposition temperature varied of 800, 900 and 1000oC in a nitrogen gas environment during 2 hour. The crystal quality of GaN thin films have characterized by XRD measurement. The surface morphology and cross section of the films observed by SEM. The film compositions determined by EDX characterization. The results showed that all the GaN thin films on silicon substrate have oriented polycrystalline structure. The crystal quality of GaN film is formed is influenced by the deposition temperature. In a deposition temperature range is used, increasing the deposition temperature can improve the crystal quality of GaN films.   Keywords: GaN Thin Films; Spin-Coating Technique; Silicon Substrate

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