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Monte Carlo Simulations of Resistive Plate Chamber for 0.511 MeV Photon with FLUKA

100%
Demir N., Aydın A.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 1
466-468
EN
We report the simulation results of resistive plate chamber for 0.511 MeV photons using FLUKA code. The efficiency of resistive plate chamber is directly related to the number of electrons produced in the gas gap. Therefore, the type of converter materials and thickness are important parameters for resistive plate chamber detection performance. In this work, the FLUKA based simulations for parallel and isotropic photons were operated for detection efficiency by choosing different converter materials and thicknesses.
2
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Improvement of Cycling Stability of LiMn_2O_4 Cathode by Al_2O_3 Surface Coating for Li-Ion Batteries

61%
Şahan H., Göktepe H., Kılıç Dokan F., Aydın A., Veziroğlu S., Patat Ş.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 2
368-370
EN
The effect of the Al_2O_3 coating on the charge-discharge cycling performance of spinel powder (LiMn_2O_4) was investigated in the range of 3.5-4.5 V at 1C. The Al_2O_3 coating on the surface of the spinel powder was carried out using the solution method, followed by 500C for 6 h in air. Powder X-ray diffraction pattern of the Al_2O_3-coated spinel LiMn_2O_4 showed that the Al_2O_3 coating medium was not incorporated in the spinel bulk structure. Scanning electron microscopy results showed that the Al_2O_3 coating particles were homogeneously distributed on the surface of LiMn_2O_4 powder particles. The Al_2O_3-coated LiMn_2O_4 retained 92.3% of its original capacity after 30 cycles, showing much better cycle ability than the bare lithium manganese oxide. The improvement of electrochemical performance is attributed to suppression of Mn^{2+} dissolution into electrolyte via Al_2O_3 layer.
3
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The Effect of Multiple Cation (Al, Si, Ti, Co) Doping on Electrochemical Performance οf LiMn_2O_4 Cathode Active Material

61%
Kılıç Dokan F., Şahan H., Veziroğlu S., Akkuş Taş N., Aydın A., Patat Ş.
Acta Physica Polonica A
|
2013
|
vol. 123
|
issue 2
365-367
EN
In order to improve the cycling performance of LiMn_2O_4, the spinel phases base and multiple cation doped LiMn_{1.95}Al_{0.0125}Si_{0.0125}Ti_{0.0125}Co_{0.0125}O_4, LiMn_{1.9}Al_{0.025}Si_{0.025}Ti_{0.025}Co_{0.025}O_4 spinels were synthesized by the glycine-nitrate combustion process. The structures of the products were investigated by X-ray diffraction, scanning electron microscopy and electrochemical tests.
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