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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 6 Documents
 1 
Search results for , issue "Vol 9, No 2 (2006): Berkala Fisika" : 6 Documents clear
DETERMINATION ROCK DENSITIES OF ULUBELU GEOTHERMAL LAMPUNG BY USING GRAVITY METHOD COMBINED WITH BOREHOLE METHOD Suharno, Suharno; Danusaputro, Hernowo
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The Ulubelu geothermal system is located within Tanggamus volcanism. Rock densities were measured from wells Rendingan (Rd), Kukusan I (Kk1), Kukusan II (Kk2), Ulubelu II (UBL2) and Ulubelu III (UBL3). A terrain density estimate was made across line GG’ using the Nettleton method. The measured densities results, show values ranging between 2.60 x 103 kg m-3 and 2.70 x 103 kg m-3.  The density estimated profile is presented in Figure 2 shows the density of about 2.70 x 103 kg m-3. Combined with the results from the laboratory measurements of borehole samples and density estimated, those suggest as  the mean density of upper continental crust commonly used for the reduction of Bouguer anomalies (2.67 x 103 kg m-3).
Penghitungan Rasio Intensitas Ca (II) 396,8 nm dan Ca (I) 422,6 nm pada Sampel Tasbih Asli dan Imitasi menggunakan Metode Laser Induced Shock wave plasma (LISPS) Khumaeni, Ali; Setia Budi, Wahyu; Firdausi, K. Sofjan
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Spectral analysis of elemental bead samples has been done using Laser Induced Schock Wave Plasma (LISPS). This experiment is aim to distinguish between bead samples from fresh white coral and its artificial from hardwood through determination of spectral intensity of Ca(II) 396,8 nm and Ca(I) 422,6 nm. The samples are held by 10 torr and induced by NdYAG Laser 1064 nm in wavelength. Results show that the original and artificial samples can be distinguished from ratio of intensity at 1,68 : 0,80 both for white coral and its artificial from hardwood through determination of spectral intensity of Ca (II) 396,8 nm dan Ca (I) 422,6 nm respectively.
UJI HASIL KINERJA MESIN PENGOLAH FILM OTOMATIS MINI MEDICAL Raharjo, Oky Didik; Azam, Much.; Ketut Umiati, Ngurah Ayu
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Have been researched result test of Mini Medical automatic processing film machine. The research is conducted by reforming X-ray toward the film in the cassette which there is stepwedge on it, film catharsis is then performed using automatic processing film machine. After generating radiograph, its density is measured, and then we count speed index, fog index and contrast index. This activity is conducted every day for seven days in succession. Based on the index of fog and contrast film, the result of the research indicates that the work result of automatic processingn film machine on the first until fifth day is still in the allowed limits, but on the sixth and seventh day it exceeds the permitted limits. This is due to the ability of generator solution is getting lower (solution pH is getting smaller). Mean while, its speed index for seven days is still in the permitted limits.   Keywords : Result test, automatic processing film machine, stepwedge, fog,  contrast
PENENTUAN KONSENTRASI AKTIVITAS URANIUM DARI INDUSTRI FOSFAT MENGGUNAKAN DETEKTOR ZnS(Ag) Setiani, Indri; Munir, Mohammad; Firdausi, K. Sofjan; Bunawas, Bunawas
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The activity concentration measurement of uranium (U238) in yellowcake sample which is coming from  phosphate fertilizer industry P.T. PETRO KIMIA Gresik  by using ZnS(Ag) detector has been done. In order to do this measurement, it is needed to callibrate and calculate the minimum detectable level of the detector. From the five samples that contain different yellowcake concentration, 400 mg of each samples were placed on five 2-inches-diameter stainless steel planchettes. HNO3 solution were added and the samples were shaken in order to make the samples as homogeneous as possible. The samples were totally evaporated under an infrared lamp until dry. Then they were counted by ZnS(Ag) detector. The uranium activity concentration measurement result of this method shows that sample with highest concentration of yellowcake (100%) have concentration activity 2,37 Bq/mg. While the sample with lowest concentration of yellowcake (37,5%) have concentration activity 0,95 Bq/mg. Key words     : uranium, phosphate fertilizer industry, ZnS(Ag) detector, yellowcake
LINIERISASI KELUARAN PENCATU DAYA MENGGUNAKAN KOMPUTER Sumariyah, Sumariyah; Endro Suseno, Jatmiko; Arimono, Ibnu
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A power supply with linier output voltage that controlled by computer has been made. The range of output power supply is +2 until +16 volt.             For providing a voltage with a linier output by turning around the potentiometer in the power supply. The potentiometer is turned around by motor stepper that controlled by computer. The step angle of motor stepper is reduced by the gear combination with transmission ratio 59:26. Step angle reduction for mechanical rotate movement are 0.8° per step and with rising of the output power supply 0.1 volt per step.             This system had been realized and can work with voltage that we want and output voltage have a tolerance 0.06
STUDI SIFAT ELEKTROOPTIS PADA KACA AKUARIUM, KACA PREPARAT, DAN AKRILIK Nila Kusuma, Anis; Firdausi, K. Sofjan; Setia Budi, Wahyu
BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The properties of electrooptics of transparency media such as aquarium glass, micro slides, and acrylic have been studied. To obtained the change of refractive index (Dn) of materials against external static electric field (E), the samples are placed in two parallel plates applied by potential different of  0 – 104 V. The maximum external field reached by this experiment is in order 106 V/m. The change of refractive index as function of E is measured by Michelson interferometer equipment. First, our results show that the refractive index decreases as E increases for all samples. Second, Dn varies slightly square to E, which is still the dominant of linear electrooptic coefficient. The graphs both of acrylic and slides are rather smooth, which indicates that the crystal structures are more regular than aquarium glass. Key Words: electrooptics, refractive index, static electric field

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