Yazar "Yilmaz, Onur" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Effects of ultrasonication and conventional mechanical homogenization processes on the structures and dielectric properties of BaTiO3 ceramics
    (Elsevier Science Bv, 2017) Akbas, Hatice Zehra; Aydin, Zeki; Yilmaz, Onur; Turgut, Selvin
    The effects of the homogenization process on the structures and dielectric properties of pure and Nb-doped BaTiO3 ceramics have been investigated using an ultrasonic homogenization and conventional mechanical methods. The reagents were homogenized using an ultrasonic processor with high-intensity ultrasonic waves and using a compact mixer-shaker. The components and crystal types of the powders were determined by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analyses. The complex permittivity (epsilon', epsilon'') and AC conductivity (sigma') of the samples were analyzed in a wide frequency range of 20 Hz to 2 MHz at room temperature. The structures and dielectric properties of pure and Nb-doped BaTiO3 ceramics strongly depend on the homogenization process in a solid-state reaction method. Using an ultrasonic processor with high-intensity ultrasonic waves based on acoustic cavitation phenomena can make a significant improvement in producing high-purity BaTiO3 ceramics without carbonate impurities with a small dielectric loss. (C) 2016 Elsevier B.V. All rights reserved.
  • Küçük Resim
    Öğe
    The genetic structure of the goat breeds belonging to Northwest part of Fertile Crescent
    (Elsevier, 2020) Gul, Sabri; Yilmaz, Onur; Gunduz, Zuhal; Keskin, Mahmut; Cemal, Ibrahim; Ata, Nezih; Onel, Suleyman Ercument
    The present study was performed to reveal genetic diversity and population structure of four native Turkish goat breeds (Hatay, Kilis, Shami and Hair), raised in Hatay and Kilis provinces located in northwest part of Fertile Crescent, using twenty-two microsatellite markers. Animal material for the study was consisted of 246 goats from Hair (60), Shami (62), Kilis (64) and Hatay (60) breeds. A total of 458 alleles were detected from twenty two markers studied. Results obtained for the mean number of alleles (20.82), expected heterozygosity (0.89) and polymorphic information content (0.88) indicated that the total analyzed population is characterized by noticeable genetic variability. The value obtained for the global coefficient of gene differentiation showed that the majority of the total genetic variation is due to individual differences (97.50%). Clustering analysis divided native goat breeds raised in Fertile Crescent into two clusters. The first cluster was consisted by Kilis and Hatay goat breeds, the second cluster was formed by Shami and Hair goat breeds. Results indicated that Kilis goat and Hatay goats are genetically closer than the other studied breeds. The results obtained from the present study will be helpful for constructing suitable selection program for indigenous goat breeds studied. On the other hand, obtained information on genetic relationships between other goat breeds raised in the region and Hatay goat is very valuable to be registered as a national breed.