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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 "2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015" : 6 Documents clear
GENERATOR PEMBANGKIT PLASMA DENGAN KONFIGURASI ELEKTRODA BATANG TIPIS DAN JARUM Wardaya, Asep Yoyo; Nur, Muhammad
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

The application of plasma generator has been developed for everyday live because it can generate high electric field and induced current, even by only 12 volt of potential difference. The advantages of the plasma generator are mainly caused by configuration form of its electrodes which is usually very sharp and asymmetric form. In this paper, plasma generator has been discussed using electrodes configuration of the thin rod and needle in two dimensional planes. The result shows that the plasma generator can produce various high electric fields, which highest field at the tip of needle electrode. In case of configuration of needle electrode, it will be produced saturated current due to their asymmetric electrodes, while in case of thin rod electrode; it will be no saturated current due to symmetric electrode. Keywords: plasma generator, thin rod and needle configuration electrodes, electric field, saturated current.
OPTIMASI PEMBANGKIT LISTRIK TENAGA ARUS LAUT MENGGUNAKAN SISTEM TURBIN SAVONIUS TERMODIFIKASI Rahmi L, Halida; Dharmala S, Budi; Gediana, Almas; Yusup, Agus; Septria, Wenty
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Difficulty of access to service and installation of the electrical network in the area around a coast becomes a factor causing uneven distribution of power network. Therefore, a new prototype of Sea Flow Power Plant was prepared using a modified Savonius turbine. The modified Savonius turbine is a vertical wind turbine, which is modified into a horizontal turbine and made two pairs of turbines in different directions. Advantage of this turbine can optimally capture the come and back flows. Preparing prototype of the turbine is conducted after collecting data of the sea flow velocity surrounding Teluk Penyu - Cilacap, that is followed by manufacturing a modified Savonius turbine and prototype of PLTAL. Performance test reveals that the prototype can generate P =0,3 Watt, the velocity of turbine rotation ω = 44.42 rad/s, the turbine torque M = 0,0064 Nm and the diameter of turbine d = 0,32 m.  The sea flow velocity is often naturally changed leading to the turbine rotation change. It is found that the power and the turbine rotation increase with increasing the sea flow velocity.  At the sea flow velocity of  1,5 m/s, the prototype of PLTAL has good performance and very potential as a source of alternative electrical energy in the future. Keywords: Savonius turbine,  sea flow, electrical energy, power plant.
STUDI APLIKASI EFEK FOTOKATALIS ZnO:Ag DIKOMBINASI OZON PADA PROSES PENCUCIAN CABAI Sutanto, Heri; Arifin, Zaenal; Wibowo, Singgih; Hidayanto, Eko
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

In this study, we have done evaluation of photocatalyst and ozone effect on chilies. The photocatalyst thin film was made by Ag doped zinc oxide (ZnO). The film was evaluated by X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM) and UV-Vis for crystall stucture, morphology and optical band gap analysis. XRD result showed that the film has hexagonal wurtzite structure with crystallite size about 19.93 nm. From SEM result, morphology of film was not homogen and there were a lot of pores. From UV-Vis measurement, we could calculate the optical band gap of film about 3.081 eV.  The chilies that used is hot peppers. They were washed by water from ZnO:Ag photocatalyst and ozone treatment. Time for water treatment was adjusted for 0, 15, 30 and 45 min. We have done monitoring on loss of mass of the chilies. The result showed that  15 min sample showed better result than other sample. In this sample, the chilies had smallest change of loss mass in 13 day observation. Keywords : Photocatalyst, ozone, chilies.
INTERPRETASI MODEL ANOMALI MAGNETIK BAWAH PERMUKAAN DI AREA PERTAMBANGAN EMAS RAKYAT DESA CIHONJE, KECAMATAN GUMELAR, KABUPATEN BANYUMAS Sehah, Sehah; Raharjo, Sukmaji Anom; Prasetyo, Chandra Adi
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Measurement of magnetic data has been done in the area of ​​the gold mining in the village of Cihonje, the district of Gumelar, the regent of Banyumas in May to June 2013. Based on the modeling that has been conducted on the local magnetic anomalies along cross section of AB obtained six models of subsurface rock, while for along cross section of AB obtained five models. Based on the modeling results, rock formations that developed in the research area are Tapak formation, Halang formation, andesite-basaltic, and the alternating formation of the sandstones with some other rocks. The magnetic susceptibility of subsurface rock in the research area are interpreted ranged from 0.0039 to 0.0174 cgs units with the average magnetic susceptibility of rocks is estimated equal to 0.0099 cgs units that interpreted as the alternating formation of sandstone and claystone from Halang formation. The mineralization of gold ore is estimated to occur in almost of all subsurface rocks, but the most dominant mineralization is estimated to occur in the Halang formation especially on the alternating formation of sandstone and claystone. The gold ore mineralization occurs in the form of veins of pyrite, chalcopyrite, galena, and the others, that fill the cracks and the pores of the rocks. Keywords: magnetic anomaly, gold mining, Village of Cihonje
Redaksional April 2015 Berkala Fisika, Tim Redaksi
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Redaksional April 2015
PENGARUH GAIN TERHADAP FWHM DAN FWTM PADA CITRA B-MODE ULTRASONOGRAM (USG) Amitasari, Ria; Suryono, Suryono; Adi, Kusworo
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

The effect of gain to The Width at Half Maximum (FWHM) and Full Width at Tenth Maximum (FWTM) on B-mode image ultrasonogram (USG) has been investigated. The aim of this research is to determine the effect of gain on the spatial resolution according the measurements of FWHM and FWTM. The evaluated resolution type is axial and lateral. This research used phantom multipurpose multi tissue with gain (30 dB, 35 dB, 40 dB, 45 dB, 50 dB, 55 dB and 60 dB) on frequency variation source 6,2 Mhz, 8 MHz dan 10MHz. The axial and lateral resolution images were obtained by using USG which uses B-Mode imaging. The measurement was made by using digital image and calculated objectively with MATLAB. The measurement of FWHM and FWTM was obtained from IP-PSF analysis (In Plane-Point Spread Function) using approximation for the Gaussian function. The result shows that there is influence from gain on FWHM and FWTM. The decreasing gain resulted in decreasing of FWHM and FWTM. The decreasing of FWHM and FWTM represents better spatial resolution, and vice versa. Keywords: FWHM, Gain, Point Spread Function, Spatial resolution, USG,

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