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INDONESIA
Atom Indonesia Journal
Published by Badan Tenaga Nuklir Nasional
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology
Exist for publishing the results of research and development in nuclear science and technology Starting for 2010 Atom Indonesia published three times a year in April, August, and December The scope of this journal covers experimental and analytical research in all areas of nuclear science and technology. including nuclear physics, reactor physics, radioactive waste treatment, fuel element development, radioisotopes and radio pharmaceutical engineering, nuclear and radiation safety, neutron scattering, material science and technology, as well as utilization of isotopes and radiation in agriculture, industry, health and environment.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 32, No 2 (2006): July 2006" : 5 Documents clear
Study of Graft Copolymerization of Acrylic Acid Onto Nata De Coco and its Application as Microfiltration Membrane T Puspitasari; CL Radiman
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (163.99 KB) | DOI: 10.17146/aij.2006.122

Abstract

Chemical and physical modifications of membrane can be carried out by radiation induced graft copolymerization. The aim of this research is to prepare graft copolymers of acrylic acid onto nata de coco (NDC-g-AAc) by radiation and to study the performance of grafted copolymer as microfiltration membrane. Using a total dose of 30 kGy, the highest degree of grafting obtained were 209% and 142% for r (weight ratio of monomers to nata de coco) equal to 61.3 and 35.7 respectively. The increasing degree of grafting resulted in decreasing flux due to high hydrogen bonding between grafted acrylic groups and water. It was found that the degree of swelling of NDC-g-AAc membrane with r = 35.7 was higher than that of r = 63.1. The changes of chemical structure of membrane were characterized by FTIR spectroscopy which showed a new band at 1720 cm-1 attributed to the carbonyl group of acrylic acid
The Influence of Platinum Dopant on the Characteristics of SnO2Thin Film for Gas Sensor Application T. Sujitno; Sudjatmoko Sudjatmoko
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.118

Abstract

Doping of platinum on tin dioxide (SnO2) thin film for gas sensor application has been carried out using ion implantation techniques. The SnO2 thin film has been deposited using dc sputtering method at the conditions; operating pressure 5x10-2 torr, anode-cathode voltage 2.0 kV, substrate temperature 2000C and deposition time one hour. While the Pt ion implantation process were carried out at energy 60 keV and ion doses were varied.  From scanning electron microscope (SEM) observation, it was found that   SnO2:Pt thin film which was deposited by those parameters has a fine morphology with the grain size of thin film was in order of 0.7 – 1.0 μm and thickness 4.16 μm.  From crystal structure analysis using XRD it was observed that the crystal planes of SnO2:Pt were  (110), (101), (200), (211), (300), and (112) . From energy dispersive X-rays analysis (EDX) coupled with SEM, it was found that the chemical composition of SnO2:Pt  thin film were 66.12%-at O, 1.23 %-at Si, 0.12 %-at Pt and 32.53 %-at Sn.  It was also found that the influence of platinum dopant on SnO2 thin film can reduce significantly the resistance of thin film and from response time and sensitivities measurement showed that for every dose variation for different tested gas has a different respons time and sensitivities (no a specific pattern)
Digital Correlation of First Order Space Time in a Fluctuating Medium B. Santoso
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.119

Abstract

The study of fluctuating medium has been of great interest through the use of the correlation techniques A laser beam is known to form a coherent beam which  can be made to propagate within the fluctuating medium. This will allow the  study of the outgoing beam using digital correlation technique. Based on  the power spectrum, the integral transformation of the correlation function,  one can obtain for instance the radius and mass of the particles executing Brownian motion in the dispersed solution. To correlate the laser beam directly may not allow the detection of  signals by electronic means. A method of digitizing the light signals  by means of light beat heterodyne technique is  therefore adopted. The temporal and special correlation functions can be measured
Production of Natural Rubber Grafted Styrene Copolymer Latex as Water Base Coatings M Utama; K Widjaja
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.120

Abstract

Twelve kinds formulation of natural rubber grafted copolymer styrene (NR-g-S) prepared by gamma radiation co-polymerization technique has been carried out. The characteristic of NR-g-S and its water base coating such as molecular structure, particle size, and the properties of latex and its film were evaluated. The results showed that the NR-g-S latex as a water base coating has low viscosity, height strength,  good grease resistance, good flexibility, good aging and corrosion resistance on concrete cement and metal. The average particle size is between 270-300 nm, and the bonding between  poly-isoprene of NRL and styrene molecules were grafted copolymer
Gene Mutation as Biomarker of Radiation Induced Cell Injury and Genomic Instability M Syaifudin
Atom Indonesia Vol 32, No 2 (2006): July 2006
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2006.121

Abstract

Gene expression profiling and its mutation has become one of the most widely used approaches to identify genes and their functions in the context of identify and categorize genes to be used as radiation effect markers including cell and tissue sensitivities. Ionizing radiation produces genetic damage and changes in gene expression that may lead to cancer due to specific protein that controlling cell proliferation altered the function, its expression or both. P53 protein encoded by p53 gene plays an important role in protecting cell by inducing growth arrest and or cell suicide (apoptosis) after deoxyribonucleic acid (DNA) damage induced by mutagen such as ionizing radiation. The mutant and thereby dysfunctional of this gene was found in more than 50% of various human cancers, but it is as yet unclear how p53 mutations lead to neoplastic development. Wild-type p53 has been postulated to play a role in DNA repair, suggesting that expression of mutant forms of p53 might alter cellular resistance to the DNA damage caused by radiation. Moreover, p53 is thought to function as a cell cycle checkpoint after irradiation, also suggesting that mutant p53 might change the cellular proliferative response to radiation. p53 mutations affect the cellular response to DNA damage, either by increasing DNA repair processes or, possibly, by increasing cellular tolerance to DNA damage. The association of p53 mutations with increased radioresistance suggests that alterations in the p53 gene might lead to oncogenic transformation. Current attractive model of carcinogenesis also showed that p53 gene is the major target of radiation. The majority of p53 mutations found so far is single base pairchanges (point mutations), which result in amino acid substitutionsor truncated forms of the P53 protein, and are widely distributedthroughout the evolutionarily conserved regions of the gene. Examination of p53 mutations in human cancer also shows an association between particular carcinogens and characteristicpatterns of these mutations. Even amongcancers of the same organ, the mutational spectrum of the p53gene could present different patterns by histologic subtypeor risk factors and mutagen involved

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