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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
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Search results for , issue "2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014" : 7 Documents clear
KAJIAN LAHAN GAMBUT SEBAGAI CALON LOKASI/TAPAK PLTN Khusyairi, Akhmad
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

The utilization of nuclear technology for energy will increase significantly which will supply electricity demand in the future. Geologically, Indonesia has varied condition which imply to design, operation and emergency plan. Peat lands have specific physical and chemical natures, therefore the owner should pay attention for this site to be assessed. The general potential hazard is peat lands fire during summer season which is effected by deforestation and low level of water surface, which will influence to the plants structure integrity. The assessment method which was used is literature study. Keywords: Peat lands, NPP, nuclear, electricity
STUDI KOROSIVITAS DAN MORFOLOGI PERMUKAAN BAJA KARBON API 5L GR-B YANG DILAPISI POLIMER HIBRID PADA LINGKUNGAN AIR LAUT DAN GAS H2S PADA KONDISI JENUH CO2 Setiawidiani, Dinar; Susilawati, Tuti; Suryaningsih, Sri; Harjo, Hardoyo
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

It has been tested with the corrosion protection of carbon steel using hybrid inorganic - organic polymer. Hybrid polymer precursor materials is synthesized from monomers poly (TMSPMA) using sol- gel technique. The hybrid polymer precursors coated on the surface of carbon steel API 5L GR - B, and then thermally polymerized. Corrosion test conducted in a seawater environment, H2S, CO2 saturation using potentiodynamic polarization method and morphological examination using a Scanning Electron Microscope. The obtained results shows the corrosion rate of carbon steel without coating in critical condition was 1.643 mm/year. Once the hybrid polymer coated carbon steel with a corrosion rate becomes 0.903 mm/year. The corrosion rate was reduced to 0.74 mm/year. Corrosion rate is related to the protection efficiency of 45.05%. These results are supported by data that shows the surface morphology uneven corrosion on carbon steel surface after coated with polymer hybrid. Keywords : corrosion , carbon steel , polymer hybrid , potentiodynamic polarization
Cover, Redaksional dan Petunjuk Penulisan Berkala Fisika Vol. 17 No.2 April 2014 Berkala Fisika, Tim Redaksi
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Cover, Redaksional dan Petunjuk Penulisan Berkala Fisika Vol. 17 No.2 April 2014 oleh Tim Redaksi
ANALISIS DISTRIBUSI TEMPERATUR PERMUKAAN TANAH WILAYAH POTENSI PANAS BUMI MENGGUNAKAN TEKNIK PENGINDERAAN JAUH DI GUNUNG LAMONGAN, TIRIS-PROBOLINGGO, JAWA TIMUR Nur Faridah, Sri Ana; Krisbiantoro, Agus
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Geothermal is a good alternative energy for this country. Are on track the ring of fire that able to make Indonesia has big and plenitude geothermal reserve. There are 11 regions in East Java that predict as geothermal prospect’s regions. Mount Lamongan’s region, Tiris- Probolinggo, East Java is the object of this research. The existence of geothermal in a region can identify with the surface manifestation, such as hot spring, fumaroles, geyser, hot mud, etc. Remote sensing technique can be use for identifying the indication of geothermal potency from the land surface temperature in the research region. Data analysis from Landsat 7 ETM+ path/row 118/65 (in 6 band thermal) in 2010-2013, it will describe of land surface temperature of geothermal prospect in study area. The result of land surface temperature showed that there is a heat distribution in the study area where the temperature ranges from 37oC up to 67oC, and it is alleged indication of geothermal. Therefore, it is interesting to study as the first step to explore geothermal safe and easy. Keywords: geothermal potency, land surface temperature, remote sensing, Landsat 7 ETM+ imagery, mount Lamongan.
PENENTUAN QUALITY CONTROL (QC) RESOLUSI SPASIAL PADA CITRA CT SCAN DENGAN METODE LINE SPREAD FUNCTION (LSF) DAN POINT SPREAD FUNCTION (PSF) MENGGUNAKAN PHANTOM AAPM CT PERFORMANCE Yusanti, Weirna; Budi, Wahyu Setia; Adi, Kusworo
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Computed Tomography (CT scan) is one of the X-ray modalities used in radiodiagnostic, as result it needs to do Quality Control (QC). This study focused on the image quality test of CT Scan by considering the spatial resolution parameters and using calculation method of the digital image. The effect of exposure factors (voltage and electric current) was also on image quality. This study using multislice CT (MSCT) 128 slice and AAPM CT Performance Phantom. Phantom scanned with the variation of exposure factors (80, 100, 120 kV and 50, 100, 150, 200, 250, 300, 350, 400, 450, 500 mA). The determination of spatial resolution value derived from the value of Full Width at Half Maximum (FWHM) of the Line Spread Function (LSF) and Point Spread Function (PSF) graphics. Results shown that the higher voltage applied, the smaller value of FWHM which show better image quality. This method is able to detect spatial resolution up to the 5th level (hole diameter 0.75 mm), whereas it is only up to 3rd level (1.25 mm) visually. The image quality in this study has been compared with the rules of West Austr Compliance Testing Protocol 2006, and it is proved that the  image quality is still good, thus the CT Scanner is still feasible to  use. Key words: CT Scan, Spatial Resolution, Line Spread Function, Point Spread Function
PREDIKSI PENURUNAN KUALITAS UAP PEMBANGKIT LISTRIK TENAGA GEOTERMAL DIHUBUNGKAN DENGAN STRATEGI PEMELIHARAAN DIMASA YANG AKAN DATANG Mulyana, Cukup; Nurhilal, Otong; H Saad, Aswad; Taufik, Ahmad
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

In Geothermal power plant steam quality plays a very important role because it is associated with enthalpy and affects the reliability of the turbine. Studies have been carried out on the trend of a decrease in pressure, temperature and flow that comes out of a wellhead for 25 years. In addition the study also conducted in steam pressure drop duriing transmission process in the pipeline from the wellhead to the turbine due to friction factor , elevation , and junctions. Existing wellhead temperature is 202OC – 243OC, pressure of 8.2 kg/cm2 – 12.7kg/cm2. Operating parameters of the turbine are minimum pressure of 6.5 kg/cm2 and superheat temperature of 169oC. By looking at the trend of decrease in pressure and temperature, in the next few years is concerned to be achieved under the limit pressure. Concerning the decrease of enthalpy, give impact to decreasing of KWh. Therefore it should be anticipated from the beginning so it is not threat the continuity of the operation of geothermal power. From the study enthalpy did not decrease significantly in other hand the pressure drop significantly at the wellhead. The steam quality is still in good because the steam is superheated condition. The problem that needs to be addressed is the pressure drop from the wellhead to the turbine at 16.1 %. It is recommended to replace the T junction into a Y junction in order to minimize the pressure drop in the pipeline transmission. Keywords : steam quality, pressure, temperature, wellhead
PENDUGAAN LAPISAN RESERVOIR PANAS BUMI DI KAWASAN GUNUNGAPI SLAMET DENGAN MEMANFAATKAN DATA ANOMALI MEDAN GRAVITASI CITRA SATELIT Reswara P.A., Ardhana; Sehah, Sehah
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Estimation of the subsurface geological structures of Slamet Volcano area, Central Java, has been done by utilizing gravity field anomaly data of image of Geodetic Satellite (Geosat ) and European Remote Sensing-1 (ERS-1) satellite which has been corrected up to free air correction. This research aims to model the 2D profile of the subsurface geological structure which includes some layers of bedrocks, geothermal reservoir, magma chamber, and other geological structures. The procedure of data processing begins with bougeur and topographic corrections. The data obtained, then transformed to horizontal surface, filtered from the local anomalies effects, and corrected from the regional anomaly effect. The results obtained are in the form of residual gravity anomaly data. Modeling is done on the residual gravity anomaly data using 2 ½-D Talwani method packaged in Grav2DC for Window software. The modeling results show the subsurface geological structure of Slamet Volcano region consists of andesite magma with density value of 2.45 gram/cm3, old lava rock with density value of 2.9 gram/cm3, andesite rock with density of 2.54 gram/cm3, and andesitic – basaltic rock with density of 2.67 gram/cm3. Based on the research area geological information, strongly estimated that the geothermal reservoirs layers are in the andesite rock by filling in it pores or it fissures in the rock. Keywords: gravity field anomaly, modeling, geothermal reservoirs, Slamet Volcano.

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