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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 369 Documents
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PEMODELAN ZONA SESAR OPAK DI DAERAH PLERET BANTUL YOGYAKARTA DENGAN METODE GRAVITASI Nurwidyanto, M. Irham; Dwi Indriana, Rina; Thaha Darwis, Zukhrufuddin
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A gravity research was done in Pleret, Bantul, Yogyakart.It’s covering 55 measurements points. This research aims to estimated subsurface structure  fault zone of the area, correctly along Opak River’s. Type of Gravitymeter La Coste & Romberg G-1118 using electronics feedback system with accuracy 0.005 miligal was used to measure gravitational field. Interpretation result from kualitative and kuantitative  are  estimated the structure in the research area consist of tree layer that arre  limestone, breccia, and alluvial sediment and Opak sediment’s
DISTRIBUSI DOSIS PHOTON MENGGUNAKAN TEKNIK 3DCRT DAN IMRT PADA RADIASI WHOLE PELVIC KARSINOMA SERVIKS Suhartono, Bambang Haris; Setia Budi, Wahyu; Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Cancer therapy in carcinoma of the cervix performed with external radiotherapy modalities box beam photon field and 3-Dimension Conformal Radiotherapy (3DCRT) and Intensity Modulation Radiation Therapy (IMRT). IMRT compared with 3DCRT technique on whole-pelvic radiation cervical carcinoma by analyzing the distribution of dose or planning the target volume (PTV) coverage through homogeneity index (HI) and Conformity Index (CI) as well as the organ risk (OAR).This study uses 44 patient data in Installation Radiotherapy Hospital Dr. Soetomo with radiation planning 25x2 Gy of whole pelvic radiation with two planning techniques using the box 3DCRT and IMRT techniques on the angle of rotation 0, 180, 270, and 90 degrees, and then compare the Dose Volume Histograms (DVH) coverage on PTV, rectum and bladder. CI values ​​for the 3DCRT technique (0.812 ± 0.067) and the IMRT technique was (0.799 ± 0.088) values ​​obtained by t test (p = 0.405), whereas for the HI value for 3DCRT technique (1.075 ± 0.079) and the IMRT technique for (1.075 ± 0.079) with values ​​(p = 0.219). Both CI and HI values ​​are not significant. Comparison of percentage of dose on the risk of organ rectum with 3DCRT and IMRT techniques consecutive (80.56 ± 11.21) and (68.14 ± 8.01) with the value (p = 0.00), whereas for bladder organ 3DCRT techniques and consecutive IMRT (80.52 ± 9.22) and (71.94 ± 7.65) with the value (p = 0.00). There is significant value in the percentage of the dose in the rectum and bladder Keywords: Whole pelvic, IMRT, 3DCRT, HI, CI
STUDY PENDAHULUAN SESAR OPAK DENGAN METODE GRAVITY (STUDY KASUS DAERAH SEKITAR KECAMATAN PLERET BANTUL) Nurwidyanto, M Irham; Brotopuspito, Kirbani Sri; Waluyo, Waluyo; Sismanto, Sismanto
BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The reconnaissance research to predict the position and the type of Opak Fault in surrounding subdistrict Pleret area was carryout by gravity method. It done by measured the intensity of gravity field. The measurement was done in five lines  cross the Opak Fault which indicated in the geological map. The intensity of gravity field  in the surround of subdistrict Pleret area are measured by la-coste Romberg  Gravitymeter,  the latitude are measured by GPS Trimble, and the position are measured by GPS Garmin III Plus. The measurement was done in five lines which separated abaut 2,5 km and about 20 km in length. The distance of observations are about 0,5 km to 1 km. The data which be collected are reduction by drift and tidal correction, free air correction, bouger correction and terrain correction. The corrected data are made bouger anomaly contour. The result of this research by kwalitative interpretation are estimated that  the location of Opak Fault in the eastern part of the position of Opak Fault which indicated in the geological map. The type of opak fault are normal fault, because can be detected by gravity method. Key words : Opak Fault, Pleret, gravity method. 
SINTESIS LAPISAN TIPIS SENG OKSIDA DIDOPING PERAK (ZnO:Ag) DAN APLIKASINYA UNTUK PENDEGRADASI POLUTAN ORGANIK AIR Sutanto, Heri; Nurhasanah, Iis; Hidayanto, Eko
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

Zinc Oxide (ZnO) is a semiconductor material that is used for photo-catalyst to degrade organic pollutants. The addition of doping silver (Ag) in ZnO can increase the photo-catalytic activity in the degradation process. In this study, the addition of doping Ag in ZnO thin film on a glass substrate deposition using thermal spray coating method has influence on the micro-structure and photo-degradation in presence of bacteria Escherichia coli (E. coli) as an organic pollutants has been investigated. Micro-structure of ZnO : Ag layer were characterized by Scanning Electron Microscopy (SEM) and photo-degradation activities of bacteria were tested with Total Plate Counter (TPC). The results show that doping Ag in ZnO give affect the topography of the surface that can increase in amount of grains and grain size in order to increase the photo-catalytic activity. It indicated by decrease in amount of E. coli bacteria from the initial sample with percentage of degradation is 99,99951% Keywords: Semiconductor, photo-catalyst, ZnO, doping Ag, micro-structure, photo-degradation
Interpretasi Bawah Permukaan Daerah Manifestasi Panas Bumi Parang Tritis Kabupaten Bantul DIY Dengan Metode Magnetik Indratmoko, Putut; Nurwidyanto, M. Irham; Yulianto, Tony
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Abstract                 Acquisition of geomagnetic field has been done at Kretek, Sanden, Pundong, Bantul and Panggang, Gunung Kidul, Yogjakarta Province on 14 s/d 17 October and  7,8,9,12 November 2009 in orde to interpreted the subsurface structure. Data has been collected by Proton Precession Magnetometer (PPM) to measured  the total  intensity of magnetic field, Global Positioning System (GPS) to determine the position and geology compass to the direction of north pole.                 The raw data has been processed and performed using IGRF (International Geomagnetics Reference Field) correction to obtain total field magnetic anomaly. Upward continuation was performed at 300 meters heigh by Magpick. Qualitative interpretation was done by analyzing regional and local anomaly maps. Quantitative interpretation was done 2 ½ D modelling cross-sectionanomaly maps using Mag2DC for Windows Software.     The result of 2-D modeling produces anomaly objects was susceptibility value (0,0405) in cgs unit  for the first object, susceptibility value (0,0425) in cgs unit  for the second object, susceptibility value (-0,0085) in cgs unit for the third object. The anomaly objects had depth in +580 meters from the surface and was considered the rock which had been experience demagnetitation proses.    Key word: magnetic anomaly, Parangtritis, susceptibilities.
Sintesis Nanopartikel Cerium Oxide Menggunakan Metode Presipitasi dan Sifat Optiknya Nurhasanah, Iis; Sutanto, Heri; Muhlisin, Zaenul; Nurdianik, Sulistia; Nursanti, Ida
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cerium oxide nanoparticles have been synthesized using precipitation method in mixed-solvent system of aquades DM and isopropanol with volume rasio of 1:6.  Presipitation wascarried out by dropping amonium hidroxide to cerium nitrate hexahydrate solution until pH of 9. Precipitated was dried at temperature of 60oC for 2 hours and then calcined  for 2 hours attemperatur of 200oC, 300o and 400oC. Optical properties of cerium oxide nanoparticles werecharacterized using UV-Vis spectrophotometer. Cerium oxide nanoparticles exhibit goodtransparency in visible region and strong UV absorbance. These reults suggesting that ceriumoxide nanoparticles are potential as bionanomaterial for application in UV-blocker.Keywords: cerium oxide, nanoparticles, precipitation, UV filter, band gap energy, UV-Visspectrophotometer
Studi Awal Pemodelan Perlakuan Virotherapy Yang Menggunakan Virus Campak Pada Tumor Paru-Paru Tikus Kartono, Agus; Sunjono, Sunjono; Arif, Ardian
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

The interaction model dynamics between tumor and viruses based on the interaction phenomenon between the three populations, namely: population of uninfected tumor cells, tumor cell population infected with the virus and the virus population. This study aimed to see the interaction between non-infected tumor cells, tumor cells infected with viruses and viruses, so it can be modeled using virotherapy treatment of measles virus in mouse lung tumors. Model parameters obtained from experimental data. Numerical Solution of the models suggest that the dose of the virus play an important role in determining the outcome of tumor therapy. Tumor growth can be slowed by using this virotherapy, but the tumor can not be killed as a whole. Keywords: model dynamics, virotherapy, measles virus, mouse lung tumors
PEMANFAATAN SIFAT OPTIS AKTIF ALAMI UNTUK KENDALI MUTU MINYAK GORENG MENGGUNAKAN LAMPU PIJAR Asy Syifa, A Y; Nisa, Fathia; Prasanti, Irvani D; Murni, Sri; Firdausi, K Sofjan
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

In this study the properties of natural optical activity of the various vegetable cookingoils was used as a new method for a quality control and was proposed as a new prospect forpreliminary test of oil quality. The samples used were various packaging cooking oil obtained inthe shops and were considered already fulfilled by SNI. The source of light to illuminate was a75W light-bulb. The change of the polarization angle of light was measured using polarizer basedon Malus’ law, and it was used to indicate the levels of oil quality degradation. The experimentalresult shows that highest change of polarization angle indicates relative lowest quality of oils. Anolive oil shows the best oils relative from other types of vegetable oils. The natural polarization inthis case is able to differentiate between various types of oil, and to distinguish fresh oil andexpired oil. It seems that natural polarization accommodates some contributed components oflevel of degradation of oil quality, i.e. free fatty acid and saturated fat. This method provides someadvantages, such as, simple equipments, a fast test, without preliminary treatment, and accurateresults. For the future, it shows a reliable test to conduct as a previous quality control for cookingoil and replaces the role of conventional, expensive standard methods. This method offers also achallenge to evaluate the level of authentication or halal of oils and fats.Keywords: oil quality, polarization angle, optical activity.
Penentuan Tebal Bahan Transparan (ZnO) Menggunakan Interferometer Michelson Edy Nugroho, Sulung; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Thickness’ determination of ZnO material on a substrate (microscope slide) by using Michelson Interferometer has been carried out. The material used in the research was ZnO transparent material deposited on a 1 mm-thickness of a microscope slide.  Refractive index of the microscope slide and the thickness of ZnO were measured by counting the fringes transitions as the materials rotated large as , on the other words, fringes transitions   as function of sinus incident angles  of laser ray, .  Incident angles of laser ray, which are used in the measurement of  ZnO transparent material thickness on microscope slide, are 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, and 10°.  Laser ray used in this research was He-Ne laser, which has 633 nm and its output power was < 1 mW. The results of this research show that there were  fringes transitions as research-materials rotated large as .  The measured fringes transitions still have remarkable agreement with the theoretical fringes transitions.  As the incident angles increases, the fringes transitions  will increase as well as.  The thickness of the ZnO thin film, which is resulted from the research, is equal to (6.0 ± 1.8) × 10-5 m.
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

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