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13 results on '"Balac, I."'

5. Sintering of mechanically activated magnesium-titanate and barium-zinc-titanate ceramics

Author

Obradović, N., Filipović, Suzana, Pavlović, Vladimir, Maricić, A., Mitrović, N., Balac, I., Ristić, M.M., and Ristić, Momčilo M.

Subjects
Ceramics, Mechanochemical processing, Materials science, Scanning electron microscope, chemistry.chemical_element, Sintering, 02 engineering and technology, Crystal structure, ceramics, mechanochemical processing, lcsh:Chemical technology, 01 natural sciences, chemistry.chemical_compound, 0103 physical sciences, Materials Chemistry, lcsh:TP1-1185, Ceramic, Ball mill, 010302 applied physics, sintering, Metallurgy, technology, industry, and agriculture, Metals and Alloys, Barium, equipment and supplies, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, chemistry, Chemical engineering, visual_art, SEM, Ceramics and Composites, visual_art.visual_art_medium, mechanochemistry, 0210 nano-technology, Zinc titanate, scanning electron microscopy
Abstract

In this article the influence of mechanical activation on sintering process of magnesium-titanate and barium-zinc-titanate ceramics has been investigated. Both nonactivated and mixtures treated in planetary ball mill for 80 minutes were sintered at 1100?C and 1300?C. The influence of mechanical activation on phase composition and crystal structure has been analyzed by XRD, while the effect of activation and sintering process on microstructure was investigated by scanning electron microscopy. It has been established that temperature of 1100?C was to low to induce final sintering stage for both systems. Moreover, we concluded that barium-zinc-titanate ceramics exhibited better sinterability than magnesium-titanate ceramics.

Published
2011

6. Influence of mechanical activation on electrical properties of barium-zinc-titanate ceramics sintered at 1100A degrees C

Author

Obradović, N., Obradović, N., Filipović, Suzana, Mitrić, M., Pavlović, Vladimir, Paunović, V., Kosanović, Darko, Balac, I., Ristić, M.M., Obradović, N., Obradović, N., Filipović, Suzana, Mitrić, M., Pavlović, Vladimir, Paunović, V., Kosanović, Darko, Balac, I., and Ristić, M.M.

Abstract

Starting mixtures of BaCO3, ZnO, and TiO2 powders are mechanically activated in a planetary ball mill for various periods of time. The powders obtained are sintered isothermally at 1100A degrees C for 120 min. Non-isothermal sintering process is followed by measurements with a sensitive dilatometer, as well. Results of microstructure characterization using SEM analyses along with DTA analyses are provided. These results are correlated with the values of electric resistivity, capacitance, and loss tangent of the samples, and it is found that with increasing milling time, the increase in values of electrical properties is noticed.

Published
2012

7. Influence of mechanical activation on electrical properties of barium-zinc-titanate ceramics sintered at 1100A degrees C

Author

Obradović, Nina, Filipović, Suzana, Mitrić, Miodrag, Pavlović, Vladimir B., Paunović, Verica G., Kosanović, Darko, Balac, I., Ristic, M. M., Obradović, Nina, Filipović, Suzana, Mitrić, Miodrag, Pavlović, Vladimir B., Paunović, Verica G., Kosanović, Darko, Balac, I., and Ristic, M. M.

Abstract

Starting mixtures of BaCO3, ZnO, and TiO2 powders are mechanically activated in a planetary ball mill for various periods of time. The powders obtained are sintered isothermally at 1100A degrees C for 120 min. Non-isothermal sintering process is followed by measurements with a sensitive dilatometer, as well. Results of microstructure characterization using SEM analyses along with DTA analyses are provided. These results are correlated with the values of electric resistivity, capacitance, and loss tangent of the samples, and it is found that with increasing milling time, the increase in values of electrical properties is noticed.

Published
2012

12. The CD34-microvascular density in colorectal cancer patients

Author

Balac, I., Jurisic, V., Laban, A., Randelovic, T., Knezevic, P., Igor Pantic, and Dzodic, R.

Subjects
Male, Microvessels, Humans, Antigens, CD34, Female, Middle Aged, Colorectal Neoplasms, Prognosis, Aged, Retrospective Studies
Abstract

To investigate the influence of the angiogenesis parameter CD34 microvascular density (MVD) on overall survival of colorectal cancer (CRC) patients.Thirty-one CRC patients were followed-up for 72 months after curative colorectal operation. Blood vessels measurement was done using the CD34-MVD immunochemistry method, and light microscopy.MVD was inversely correlated with patients' survival. MVD value35 proved as independent good prognostic factor, and patients with this value lived during the 72-month follow up after surgery, while a MVD value65 was an independent poor prognostic factor and such patients died within 11 months after radical surgery for CRC (p0.01).According to these results, the CD34-MVD seems to be a significant prognosticator of overall survival in CRC patients.

13. The CD34-microvascular density in colorectal cancer patients.

Author

Balac I, Jurisic V, Laban A, Randelovic T, Knezevic P, Pantic I, and Dzodic R

Subjects
Aged, Colorectal Neoplasms mortality, Female, Humans, Male, Middle Aged, Prognosis, Retrospective Studies, Antigens, CD34 analysis, Colorectal Neoplasms blood supply, Microvessels chemistry
Abstract

Purpose: To investigate the influence of the angiogenesis parameter CD34 microvascular density (MVD) on overall survival of colorectal cancer (CRC) patients., Methods: Thirty-one CRC patients were followed-up for 72 months after curative colorectal operation. Blood vessels measurement was done using the CD34-MVD immunochemistry method, and light microscopy., Results: MVD was inversely correlated with patients' survival. MVD value < 35 proved as independent good prognostic factor, and patients with this value lived during the 72-month follow up after surgery, while a MVD value > 65 was an independent poor prognostic factor and such patients died within 11 months after radical surgery for CRC (p<0.01)., Conclusion: According to these results, the CD34-MVD seems to be a significant prognosticator of overall survival in CRC patients.

Published
2012

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