Browsing by Author "Hancerliogullari A."

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Innovative fusion tokamak powerplant and the basic engineering for Mhd theory
(2014-06-01) Hancerliogullari A.
All around the world an endeavour to develop the fusion process as a major alternative energy has been going on for about a half century. Aries-St is the spherical tokamak (St) a innovative fusion reactor engineering. This toroidal reactor is a type of system that facilitates the occurrence of the nuclear fusion and fission events together (Tillack et al. in Fusion Energ Des 65:215-261, 2003; El-Guebaly in Fusion Energ Des 65:263-284, 2003). The Aries-St power core consist of the components directly surrounding the burning plasma and serves important functions. In fusion applications, liquid metals are traditionally considered to be the best working fluids. Sufficient tritium breed amount must be TBR >1.1 for Aries-St fusion tokamak power plant (Tillack et al. in Fusion Energ Des 65:215-261, 2003; El-Guebaly in Fusion Energ Des 65:263-284, 2003). The Aries-St power core has designed for correlation with an optimized St plasma that develop through the investigation of extensive range of plasma magnetohydrodynamic (Mhd) equations. In this study, the engineering design plasma parameters are described with respect to Mhd equilibrium and nuclear analysis, stability, radiation heat transfer conditions, current drive, and safety. In addition, turbulence model extended to an incompressible Mhd flows and monte carlo simulation are used for modeling of low-conductivity fluid. In this study the modeling of aries-st tokamak reactor produced by using aries design technology, has performed by using the monte carlo code and Endf/b-V-VI nuclear data. Monte carlo method is the general name for the solution of experimental and statistical problems with a random approach. © 2014 Springer Science+Business Media New York.
Innovative fusion tokamak powerplant and the basic engineering for Mhd theory
(2014-06-01) Hancerliogullari A.; Hancerliogullari, A
All around the world an endeavour to develop the fusion process as a major alternative energy has been going on for about a half century. Aries-St is the spherical tokamak (St) a innovative fusion reactor engineering. This toroidal reactor is a type of system that facilitates the occurrence of the nuclear fusion and fission events together (Tillack et al. in Fusion Energ Des 65:215-261, 2003; El-Guebaly in Fusion Energ Des 65:263-284, 2003). The Aries-St power core consist of the components directly surrounding the burning plasma and serves important functions. In fusion applications, liquid metals are traditionally considered to be the best working fluids. Sufficient tritium breed amount must be TBR >1.1 for Aries-St fusion tokamak power plant (Tillack et al. in Fusion Energ Des 65:215-261, 2003; El-Guebaly in Fusion Energ Des 65:263-284, 2003). The Aries-St power core has designed for correlation with an optimized St plasma that develop through the investigation of extensive range of plasma magnetohydrodynamic (Mhd) equations. In this study, the engineering design plasma parameters are described with respect to Mhd equilibrium and nuclear analysis, stability, radiation heat transfer conditions, current drive, and safety. In addition, turbulence model extended to an incompressible Mhd flows and monte carlo simulation are used for modeling of low-conductivity fluid. In this study the modeling of aries-st tokamak reactor produced by using aries design technology, has performed by using the monte carlo code and Endf/b-V-VI nuclear data. Monte carlo method is the general name for the solution of experimental and statistical problems with a random approach. © 2014 Springer Science+Business Media New York.
Natural radiation exposure and radon exhalation rate of building materials used in Turkey
(2018-06-01) Turhan S.; Temirci A.T.; Kurnaz A.; Altikulac A.; Goren E.; Karatasli M.; Kirisik R.; Hancerliogullari A.
Measuring the natural radioactivity levels and radon exhalation rates (surface and mass) in building materials is essential to evaluate the extent of radiation exposure (external and internal) for residents in dwellings. Gamma-ray spectrometry with a high purity germanium detector was used to measure the activity concentrations of226Ra,232Th, and40K in some building materials used in Turkey. Moreover, an active radon gas analyser with an accumulation container was used to measure their radon surface and mass exhalation rates. Results showed that the activity concentrations of226Ra,232Th, and40K varied from 5.2 ± 0.6 (satin plaster) to 187.0 ± 2.4 (granite) Bqkg–1, 2.6 ± 0.8 (gypsum) to 172.2 ± 7.6 (granite) Bqkg–1 and 12.3 ± ±.17.0 (sand) to 1958.0 ± 83.4 (brick) Bqkg–1, respectively. Radon surface and mass exhalation rates varied from 2.9 (marble) to 2734.6 mBqm–2h–1 (granite) and 0.033 (marble) to 53.866 mBqkg–1h–1 (granite), respectively. The activity concentration index, indoor absorbed gamma dose rate and corresponding annual effective dose were estimated and compared with the recommended limit values. The results indicated that the building materials sampled presented no significant radiological risk.
Radiometric properties of sepiolite minerals from quarries in central anatolia of Turkey
(2019-01-01) Hancerliogullari A.; Madee Y.G.A.; Kurnaz A.; Turhan S.
Sepiolite is a naturally occurring clay mineral of sedimentary origin and is a magnesium hydrosilicate. Sepiolite has been widely used as an additive raw material in ceramics and ce-ment industry, pharmaceutical, cleaning-detergent, paper, paint, cosmetic agriculture, fertilizer, etc. In this study, the natural radioactivity levels, radon emanation coefficients and radon exhalation rates of 30 sepiolite samples collected from open three sepiolite quarries (Beylikova, Polath and Sivrihisar) in Central Anatolia region of Turkey were determined by using a gamma-ray spectrometry with an HPGe detector. The average absorbed gamma dose rates directly measured in Beylikova, Polath and Sivrihisar open three sepiolite quarries lo-cated in Central Anatolia region of Turkey were found as 59, 65, and 64 nGyh–1, respectively. The average activity concentrations of 226 Ra, 232 Th, and40K in 30 sepiolite samples collected from those quarries were found as 38.6, 12.4, and 67.4 Bqkg–1, respectively. The average ema nation coefficient and exhalation rate of radon of sepiolite samples were determined as 22 % and 0.065 Bqkg–1h–1, respectively. Also, radiological parameters (outdoor absorbed gamma dose rate, annual effective dose rate, external and internal index) were estimated to evaluate the use of sepiolite samples as additive raw materials in the building sector.
The effect of Nd2O3 addition on superconducting and structural properties and activation energy calculation of Bi-2212 superconducting system
(2014-01-01) Ozturk O.; Asikuzun E.; Coskunyurek M.; Soylu N.; Hancerliogullari A.; Varilci A.; Terzioglu C.
The effect of Nd2O3 addition on the microstructural and the superconducting properties of Bi-2212 superconductor ceramics, prepared by solid state reaction method, was analyzed by performing X-ray diffraction (XRD), scanning electronic microscope (SEM), energy dispersive spectroscopy (EDS) and dc Resistivity (ρ-T) measurements. The magnetoresistivity of the samples was measured for different values of the applied magnetic field strengths (0-7 T). Also, the activation energies were calculated using the Arrhenius equation. According to these results, the Tcoffset value of the undoped sample was decreased from 79 to 42 K with the growth of magnetic field. In the same way, the activation energy (U o) values were significantly diminished by the increasing of magnetic field. A similar situation was observed in other doped samples. Activation energy for 0.05 % Nd2O3 doped sample under 7 T magnetic field was 550 J/mol the least. In addition, lattice parameter c, calculated by analysis of XRD data, was decreased with doping while lattice parameter a was increased. SEM analysis shows that particles were shrinking with the addition. When compared with other elements for EDS analyses, it was analyzed an important decrease in the percentage of Sr with the increasing of Nd contribution. © Springer Science+Business Media New York 2013.