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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 367 Documents
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Analisis Distribusi Suhu Aksial Teras Dan Penentuan keff PLTN Pebble Bed Modular Reactor (PMBR) 10 MWE Menggunakan Metode MCNP 5 Setiyo, Agung; Munir, Mohamad
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The axial temperature distribution and effective multiplication factor (Keff) for PBMR 10 MWe which used uranium dioxside (UO2) as fuel, graphite as moderator, and helium (He) gas as cooler with heterogenous reactor design which used geometry of reactor core finite cylinder has been investigated. The axial temperature distribution of reactor core analysized by splitting core reactor become 57 layers axially and every layer has height 14,9 cm. Keff of reactor  calculated by MCNP 5 with fuel enrichment variation from 7 to 10% and variation range 0,5%. The result shows that reactor in critical condition with fuel enrichment 8,6% and average temperature of reactor core is 893,635 K.   Keywords: PBMR, MCNP, Temperature distribution, Keff
Penentuan Kedalaman dan Ketebalan Akuifer Menggunakan Metode Seismik Bias (Studi Kasus Endapan Alluvial Daerah Sioux Park, Rapid Creek, South Dakota, United State of America) Listiyani, Fenti; Nurwidyanto, M. Irham; Yulianto, Gatot
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
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Abstract

Data processing of refraction Seismic has been done by using the secondary data in area of Sioux Park, Rapid Creek, South Dakota, United State of America with the trajectory of seismic SP#1 which  has geology structure of alluvial sediment. The sediment Alluvial has a form of water carrier rock precipitated by Rapid Creek Tthe data processing of refraction Seismic usedin this experiment is  Reciprocal Hawkins methode that  represent a method that develop concept of time depth recognition. The time Depth from the refractor is  equal for the travel of critical time from the aspect of between refractor and surface less than time required for the ray path of projection of area refractor at a speed of refractor. Results   of  the seismic refracted obtained: first layer consist of clay  functioning as covering laye, the second layer lapped over from clay, sand, and gravel functioning as carrier coat irrigate or coat acquife and the   third layer lapped over from stone napal, functioning as waterproof coat ( impermeable). Deepness of layer acquifer vary from 0.93 ft - 12.01 ft ( 0.28 m – 3.66 m), and their thickness vary from 0.86 ft – 14.43 ft ( 0.26 m – 4.40 m). The geometry of these  acquiferare in the form of free acquifer  or unconfined aquifer. Keywords: seismic refraction, ground water
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
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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.
Ozone Generator by Using Dielectric Barrier Discharge Plasma Technology With Spiral-Cylinder Configuration: Comparison Between Oxygen and Air As Sources Nur, Muhammad; Supriati, Aris; Hari Setyaningrum, Dyah; Gunawan, Gunawan; Munir, Mohammad; Sumariyah, Sumariyah
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
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Abstract

The ozone generator with Dielectric Barrier Discharge Plasma Technology (DBDPT) with Spiral-cylinder configuration has been developed. DBDP Reactor was constructed with spiral wire and cylinder. Plasma condition has been generated by using AC high voltage Ozone has been produced by this technology with oxygen and dry air as sources for ozone generating. In this research we found that the concentration of ozone produced increases with increasing voltage with a time constant. This concentration also increases with increasing time in certain applied voltage. Ozone concentration was higher than the concentration of dissolved ozone in water. Dissolved ozone in water was only 10 % of ozone produced and only 7 % for dry air as source. Oxygen as source of ozone was better than dry air; both for ozone produced and dissolved ozone in water.   Keyword : Ozone, Spiral-cylinder, DBDP, Oxygen, Dry air
STRUKTUR NANOKRISTAL CeO YANG DISINTESIS MENGGUNAKAN METODE PRESIPITASI DENGAN VARIASI LAMA WAKTU KALSINASI 2 Nursanti, Ida; Muhlisin, Zaenul; Sutanto, Heri; Nurhasanah, Iis
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
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Abstract

Nanocrystalline CeO have been synthesized by using a precipitation method. in a mixedsolvent system of aqua DM and isopropanol. Precipited was calcined at temperature of 300 C forvarious calcination time.  X-ray difractometer was used to investigate resulting presipitedmicrostructure.  X-ray diffraction patterns were analyzed to study effect of calcination time tostructure and crystallite size. Refinement process of x-ray diffraction pattern was carried out byusing Rietveld method.  The results show that all of precipited were CeO  nanocrystalline withsingle phase of cubic fluorite.  The difference in lattice parameter was correlated to oxygenvacancy.  Crystallite size was found in the range 9 – 11 nm, its incresed as calcination timeincreased.   The increasing of calcination time did not significant influence to  crystallite size. These result indicated that CeO  nanocrystalline  exhibited weak-agglomeration.Keywords: CeO222, nanocrystalline, microstructure, x-ray diffraction, precipitation 2o
KRISTALINITAS DAN UKURAN NANOPARTIKEL ZnO YANG DIKALSINASI PADA TEMPERATUR 100oC dan 200oC Hernowo, Alfian; Nurhasanah, Iis
BERKALA FISIKA Vol 22, No 4 (2019): Berkala Fisika Vol. 22 No. 4 Tahun 2019
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Abstract

The purpose of this researh is to analyze a crystalinity and size of zinc oxide (ZnO) nanoparticles. ZnO nanoparticles were synthesized using precipitation method followed by ultrasonic radiation. Precipitation products were calcined at temperature of 100oC and 200oC. ZnO nanoparticles were characterized using X-Ray Diffractometer (XRD) and Scanning Electron Microscope (SEM). The XRD pattern showed formation of ZnO nanoparticles with wurtzite hexagonal structure. ZnO nanoparticles with crystalinity higher than 50% was obtained at calcination temperature of 200oC. ZnO nanoparticles composed by a collection of crystallites that form spherical particle with size in the range 150–250 nm.Keywords: zinc oxide, nanoparticles, precipitation, crystal structure, crystallinity
Variasi Nilai Eksposi Aturan 15 Persen pada Radiografi Menggunakan Imaging Plate untuk Mendapatkan Kontras Tertinggi Sartinah, Sartinah; Sumariyah, Sumariyah; Ketut Umiati, N. Ayu
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
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Abstract

The study about implementation of 15 % rule for getting the highest contrast of radiograph from Computed Radiography has been done.Computed Radiography that has been used in this research was Diagnost 65 Equipment with Step wedge as object, Imaging Plate as the storage system of digital data that will be treated to become image. Diagnost 65 Computed Radiography was operated with exposure factors such as;  50 kV/80 mAs, 60 kV/40mAs, 80 kV/10 mAs, 100 kV/2.5 mAs and 110 kV/1.25 mAs with plus and minus variation of  15 % voltage. Print out Radiograph by using Laser Printer was measured its densities by using densitometer. Value of densities and contras of exposure standard were compared with value of densities and contras of exposure with plus and minus variation of 15 % rule. By using contras obtained, the highest contrast was identified.The Results research show trend of densities value; its increase thick step wedge hence the density is smaller and increase thin step wedge hence the ever greater density. Highest radiograph contrast value got at various value exposure with voltage drop of tube 15% with twice of the current was multiplied the time. From this research yielded spread implementation of 15 % rule for computed radiography at various the exposure factors 60 kV-110kV. Keywords: 15%-rule, radiograph contrast
PENGARUH TANGGAPAN DETEKTOR KAMERA GAMMA SPECT PADA PEMERIKSAAN GINJAL Arifin, Zaenal; Soejoko, Djarwani S
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
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Abstract

In nuclear medicine, it is common to exam by using SPECT / SPECT-CT for planar ortomographic imaging. SPECT aircraft can be equipped with one or more detectors. The studyaims to determine the response to the two detectors in SPECT gamma cameras. Furthermore, eachdetector used for renal function. The study consisted of two phases, the first to determine theresponse of each detector using acrylic phantom and the source of Technetium-99m activity of1mCi to 25 mCi. The second stage, renal function tests with planar imaging in four patients usingdetector 1 and detector 2. Acrylic phantom measurement results show the detector response 1 wasrelatively higher. Although the detector 2 has a lower response but is still linear with respect to the activity. In the examination of the kidneys, the evaluation focused on image analysis, count rate, uptake, GFR and transit function of time. The fourth image shows the patient count rate ofdetector 1 is also relatively high. Left kidney uptake value detection results both detectors showedno significant differences, with a mean value (48.3 ± 3.9)% and (51.7 ± 2.2)% for detector 1 anddetector 2. Both detectors generate GFR values in all four patients were in the range of 58-96 ml /min of detector 1 and 75-98 ml / min of detector 2. The results of these two detection detectortransit time function shows the left kidney patients in all phases of the four showed no significantdifferences. It was concluded that the two detectors have relatively low response but is still linearwith respect to the activity. Therefore detector 2 can still provide diagnoses did not differsignificantly with detector 1.Keywords : SPECT, Technetium-99m, response of detector, Examination of Renal
Kajian Efektivitas Pembelajaran Fisika Dalam Meningkatkan Technological Literacy Dan Kreativitas Siswa Smp Melalui Implementasi Program Pendidikan Teknologi Dasar (PTD) T. Chandra, Didi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

This research is part of the development program of Technology Education Association (PTD) in junior high school, conducted to test the effectiveness of the PTD program in improving technological literacy and creativity of students. The study was conducted by comparing the learning of physics topics through dynamic power and non PTD PTD. The research method used was a quasi experimental research design with pretest-posttest matched control group design. The samples were students at two different schools but have the same academic homogeneity, with students in classroom learning physics experiments through PTD while controlling class of students in learning physics through non-PTD. The research instrument in the form of test device used to measure technological literacy, and creativity of students. The results showed convincingly that learning physics through PTD is more effective in improving technological literacy, and creativity of students as compared to learning physics through non-PTD. Keywords: PTD, Technological Literacy, Creativity.
Analisis Produksi Ozon dalam Reaktor Dielectric Barrier Discharge Plasma (DBDP) Terkait Panjang Reaktor dan Laju Alir Udara Serta Pemanfaatannya untuk Menjaga Kualitas Asam Amino Ikan Teke, Sosiawati; Nur, Muhammad; Winarni, Tri A
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
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Abstract

Characterization of the reactor Dielectric Barrier Discharge Plasma (DBDP) has performed as a generator of ozone (O3) and as sources of input air. Ozone was measured on a variation of the voltage (4-8 kV) with the speed of air flow of 0,5, 1, 1, 3, 4, 5, 6, 8 and 10 L/min. Plasma reactor was used as ozone generators with spiral-cylinder configuration. Spiral electrodes were made of copper wire diameter of 1,2 mm,  coil length 50  mm  and diameter cylindrical electrodes while 10,3 mm of cooper sheets with thickness 0,25 mm. Dielectric material used is pyrex with diameter 2 cm and 1,1  mm for its thickness. The AC voltage was used as plasma generators with frequency of 16 kHz. This Research used plasma reactor with three  length variations that are 5, 10 and 15 cm . Results showed voltage, the length reactor and air flow rate input  affects the ozone concentration.  Ozone concentration increased while increasing voltage,  the length of  reactor  and the flow rate used is small. Amino acids  quality  in short bodied mackerel (Rastrelliger sp.) fed ozone for  12 days of storage showed that ozone could maintain the quality of short bodied mackerel amino acids . Key Words: Spiral-cylinder Electrodes, Ozone Concentrations

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