Browsing by Author "Yilmaz, R."

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Analysis of Structural, Optical, Mechanical Properties and Evaluation of Radiation Shielding Effectiveness of Strontium Borate Glasses Doped With Zno Nanoparticles
(Elsevier Sci Ltd, 2024) Kavgaci, M.; Yaykali, H.; Eskalen, H.; Perisanoglu, U.; Yilmaz, R.; Tune, H.; Perisanoglu, E. Kavaz
This research meticulously explores the synthesis, structural, thermal and optical characterization of zinc oxide nanoparticles (NPs) infused strontium borate glasses (termed SZ glasses) and their applicability as radiation shielding. The glasses have been produced using the melt quenching process in the composition series of (60-x) B2O3: xZnO: 10SrO: 10Na2O: 10CaO: 10BaO, where x varied from 0 to 20 % mol. In order to dope ZnO into glasses, its structural and morphological characteristics were investigated after it was synthesized by solution combustion method. It was found that the inclusion of ZnO significantly impacted the glasses' density, molar volume, hardness, yield stress, and thermal stability. The optical properties of the produced glasses, such as transmittance, reflection, transparency, opacity and band gap energies, were examined and the effect of ZnO on the optical properties of the glasses was investigated. Crucially, the SZ glasses exhibited notable efficiency in shielding against gamma photons and fast neutrons. This is evidenced by the favourable change in the mass attenuation coefficients with increasing ZnO concentration. Parameters like the half-value layer, effective atomic number, and energy absorption buildup factors were calculated to gauge the radiation attenuation proficiency of the SZ glasses, demonstrating their potential utility in radiation protection. In conclusion, the developed SZ glasses display advantageous structural, thermal, and optical qualities, along with robust shielding capabilities against gamma photons and fast neutrons. This study contributes significant knowledge to the field of novel glass materials, paving the way for their application in various industrial and medical contexts requiring radiation shielding.
Calculation of Coster-Kronig Enhancement Factors and L Subshell X-Ray Fluorescence Cross-Sections for 55cs
(Asian Journal of Chemistry, 2010) Yilmaz, R.; Arici, K.
X-Ray fluorescence cross-sections (sigma(Li), i = alpha, beta, l, gamma) of the Cs-55 element were calculated theoretically at excitation energies for each L, (i = 1, 2 and 3) subshell, respectively. Coster-Kronig transitions (f(12), f(23) and f(13)) are non-radiative transitions in which an inner shell vacancy is transferred from one subshell of an atom to another. The increase in L X-ray intensity due to the effect the Coster-Kronig transitions on L X-ray fluorescence cross sections were calculated theoretically. These calculated values were compared with other experimental and theoretical values. Calculations showed that the alteration in absolute intensities of L-upsilon and L-rho lines arising from Coster-Kronig transitions are greater than that of L-beta.
Calculation of Coster-Kronig Enhancement Factors for 60nd and 61pm at Different Excitation Energies
(Asian Journal of Chemistry, 2011) Yilmaz, R.; Tas, R.; Babayigit, R.; Arici, K.
Coster-Kronig processes are radiationless in which an inner-shell vacancy is transferred from one subshell of an atom to another, both belonging to the same principal shell. Because of the effect of Coster-Kronig transition on L X-ray fluorescence cross sections, an increase in L X-ray intensity were calculated theoretically at different exciation energies for L-1, L-2 and L-3 subshells. These are called as Coster-Kronig enhancement factors and were represented as K-i(i = alpha, beta, l). These calculated values were compared with other experimental and theoretical values. Calculations showed that when the excitation energies were increased with respect to absorbtion edge energy, L X-ray fluorescence cross sections decrease while Coster-Kronig enhancement factors increase.
Calculation of Coster-Kronig Enhancement Factors of the Some Elements in the Atomic Number Range 50 ≤ Z ≤ 59
(Polish Acad Sciences inst Physics, 2016) Yilmaz, R.
L X-ray fluorescence cross-sections of some elements in the atomic number range 50 <= Z <= 59 have been calculated theoretically according to subshell excitation energies of elements. The Coster-Kronig transitions (f(12); f(23), and f(13)) are non-radiative transitions. The Coster-Kronig enhancement factors due to the effect of the Coster-Kronig transitions on L X-ray fluorescence cross-sections have been calculated theoretically. The calculated values have been compared with other earlier experimental and theoretical values.
An Experimental Analysis of the Effects of Sro on the Mechanical, Structural, Optical, and Nuclear Radiation Shielding Properties of Barium Borate Glasses
(Elsevier, 2024) Kavgaci, M.; Yaykasli, H.; Eskalen, H.; Perisanog, E. Kavaz; Kalecik, S.; Yilmaz, R.; Tunc, H.
The objective of this work is to offer a better understanding of the unique structural, mechanical, optical and nuclear radiation attenuation properties exhibited by newly produced (B2O3)(70-x)(SrO)x(Na2O)10)(BaO)10(- CaO)10 glasses, where x = 0, 5, 10, 15, 20 %. For this purpose, after The XRD measurements confirmed the noncrystalline nature of the glass structures, it was noted that the substitution of B2O3 with SrO increased the density of SrO glasses in the range of 2.915 g/cm3- 3.304 g/cm3. It was also found that the addition of SrO to barium borate glasses improved their mechanical properties such as Vickers microhardness and yield stress, and the elastic modulus of the glasses decreased. The DSC curves obtained showed that the glass transition temperature increased with the addition of SrO. The direct and indirect band energies of SrO glasses, whose bond structures were evaluated by FTIR and optical properties by UV measurements, were found to decrease in the range of 3.42 eV-3.02 eV and 3.32eV-2.62eV. The nuclear radiation shielding capacities of Sr glasses were then investigated by gamma ray and fast neutron transmission experiments. For gamma-ray transmission experiments, a 133Ba radioisotope was used in combination with an HPGe detector, while a 241Am/Be source and a gas proportional detector were used for neutron absorption experiments. With the addition of SrO, the MAC values of Sr0-Sr4 glasses have shown an increase in the range 0.5116-0.0999 cm2/g and 0.7386-0.1008 cm2/g. Sr glasses has been found to be effective in the attenuation of fast neutrons, and it is even superior to conventional neutron absorbers.
Infrared Spectra, Density Functional Theory and Hartree-Fock Theoretical Calculations of 2-Methyl
(Asian Journal of Chemistry, 2013) Arici, K.; Yilmaz, R.
The Fourier transform infrared and Raman spectra of 2-methyl-8-quinolinol have been recorded at solid phase and in the region 4000-400 cm(-1). The molecular geometry, vibrational frequency, infrared intensities bands of 2-methyl-8-quinolinol in ground state have been calculated by Hartree-Fock and density functional theory with the B3LYP, BLYP and B3PW91 functional and 6-311G(dp) basis set, respectively. The calculated frequencies has been scaled which compared with experimental infrared and Raman spectra. The geometry and normal modes of vibration obtained from the Hartree-Fock and density functional theory methods are in good agreement with the experimental data.
Kβ/Kα X-Ray Intensity Ratios for Cr, Mn, Fe, and Co Excited by 8.735 Kev Energy
(Polish Acad Sciences inst Physics, 2018) Yilmaz, R.
In this study, the K shell intensity ratios K-beta/K-alpha have been experimentally determined for the elements Cr, Mn, Fe, and Co. Measurements have been carried out at 8.735 keV excitation energy by using secondary excitation method. K X-rays emitted by samples have been counted by a Si (Li) detector with 160 eV resolutions at 5.9 keV. The measured values were compared with the calculated theoretical values. The obtained values are in good agreement with the calculated values.
Kβ/Kα X-Ray Intensity Ratios for Some Elements in the Atomic Number Range 28≤z≤39 at 16.896 Kev
(Taylor & Francis Ltd, 2017) Yilmaz, R.
The K shell intensity ratios (K-beta/K-alpha) have been experimentally determined for some elements in the atomic number range 28 <= Z <= 39 by using secondary excitation method. K X-rays emitted by samples have been counted by a Si (Li) detector with 160 eV resolutions at 5.9 keV. The measured values were compared with the theoretical and experimental values. In general, the values obtained are in good agreement with the calculated values. (C) 2017 The Egyptian Society of Radiation Sciences and Applications. Production and hosting by Elsevier B.V.
Measurements of Coster-Kronig Enhancement Factors for Yb, Lu, Os and Pt Elements
(Pergamon-elsevier Science Ltd, 2009) Yilmaz, R.; Oz, E.; Tan, M.; Durak, R.; Demirel, A. I.; Sahin, Y.
In this work X-ray production cross-sections' measurements, L(l), L(alpha), L(beta) and L(gamma), of Yb, Lu, Os and Pt elements have been studied at energies in the range 9.572-14.384 keV and the effect of Coster-Kronig transitions on fluorescence cross-sections for L X-ray line has been obtained. From these studies absolute values of L X-ray cross-sections have been calculated with incorporation of the enhancement due to the Coster-Kronig effect. The experimental enhancement factors tend to be smaller than those predicted by theory. (C) 2009 Elsevier Ltd. All rights reserved.
Measurements of K-Shell X-Ray Production Cross-Sections and Fluorescence Yields for Cr, Mn, Fe and Co Elements
(Pergamon-elsevier Science Ltd, 2014) Yilmaz, R.
K-alpha and K-beta X-ray production cross-sections have been measured for the elements Cr, Mn, Fe and Co. Measurements have been carried out at 8.735 keV excitation energy by using secondary source. The values of K-shell fluorescence yields omega(K) have been measured for the same elements. The results obtained for K X-ray production cross-sections and fluorescence yields have been compared with theoretically calculated values and other available semi-empirical values. (C) 2013 Elsevier Ltd. All rights reserved.
Measurements of K-Shell X-Ray Production Cross-Sections and Fluorescence Yields for Some Elements in the Atomic Number Range 28 ≤ Z ≤ 40
(Pergamon-elsevier Science Ltd, 2015) Yilmaz, R.; Tunc, H.; Ozkartal, A.
K shell X-ray production cross-sections (sigma(K alpha) and sigma(K beta)) have been measured for some elements in the atomic number range 28 <= Z <= 40. Measurements have been carried out at 16.896 keV excitation energy using secondary source. K X-rays emitted by samples have been counted by a Si(Li) detector with 160 eV resolution at 5.9 keV. The values of K-shell fluorescence yields (omega(K)) have been evaluated for the same elements. The results obtained for K X-ray production cross-sections and fluorescence yields have been compared with the theoretically calculated values and other available semiempirical values. (C) 2015 Elsevier Ltd. All rights reserved.
A Survey of the Prevalence and Genotypes of Cryptosporidium Spp. and Giardia Duodenalis in Shelter Dogs in Batman, Turkey
(Trakia University, 2024) Aslan Çelik, B.; Yilmaz, R.; Çiftçi, T.; Çelik, Ö.Y.; Ayan, A.; Orunç Kilinç, Ö.; Oktay Ayan, Ö.
Cryptosporidium spp. and Giardia duodenalis are opportunistic zoonotic protozoan parasites related to diarrhea in humans and many mammals. This study aimed to determine the prevalence and genotypes of Cryptosporidium spp. and Giardia duodenalis in shelter dogs in Batman province. The animal material of the study consisted of 100 dogs of different breeds and sexes. Fresh fecal samples taken from the dogs were examined under the microscope by Kinyoun Acid Fast staining for Cryptosporidium spp. and by the native-Lugol method for Giardia. DNA extraction, nested PCR analysis, and sequence analysis were then performed. As a result of the analyses, all samples were negative for Cryptosporidium spp., while Giardia duodenalis was positive in 2% (2/100) of two female dogs less than one-year-old. Sequence analyses of PCR-positive samples showed that the samples overlapped with assemblage C and D samples. Although these results show that shelter dogs in Batman province do not carry a risk for humans in terms of Cryptosporidium spp. and Giardia duodenalis, it is recommended that repeated faecal examinations should be carried out as much as possible to determine the possible role of these parasites in human transmission. © 2024, Trakia University. All rights reserved.