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Öğe Assessment of environmental radioactivity in soil samples from Bartin Province, Turkey(Springer, 2021) Ozdemir Oge, Tuba; Ozdemir, Firdevs Banu; Oge, MecitThe radioactivity levels in the soil samples from Bartin Province, Turkey were determined using a HPGe detector, and the hazard parameters were calculated. The mean concentration values were measured as 6 +/- 2; 7 +/- 3; 136 +/- 15; 2 +/- 1 and 8 +/- 3 Bq kg(-1), for U-238, Th-232, K-40, Cs-137 and Ra-226, respectively. The average radium equivalent, absorbed gamma dose rate, annual effective dose equivalent, external hazard index and excess lifetime cancer risk were calculated as 26.74 Bq kg(-1), 12 +/- 3 nGy h(-1), 15 +/- 3 mu Sv y(-1), 0.1 +/- 0.02 and 0.053 +/- 0.011, respectively. Amasra district exhibited the highest radiological hazard parameters which is attributed to the mining activities. All measured and calculated values were found to remain under the limit values.Öğe Investigation of tribological properties of polypropylene (PP)- Acrylonitrile butadiene styrene (ABS) blends reinforced with graphene nano-platelets (GNPs)(Elsevier Sci Ltd, 2023) Karteri, Ibrahim; Oge, Mecit; Kucuk, Yilmaz; Oge, Tuba Ozdemir; Ozdemir, Firdevs Banu; Karatasli, Muhammet; Culha, Mehmet AliThe tribological response of PP-ABS/GNPs nanocomposites fabricated via extrusion and injection molding with varying wt% GNPs fractions were examined under varying normal load and sliding speed wear test parameters. The specimens with 3% GNPs and 11% GNPs respectively exhibited the lowest and highest specific wear rates and COF under all test conditions. Increased load led to significantly reduced COF values, whereas increased sliding speed led to a slight reduction in COF by contributing to the formation of a continuous transfer layer. Addition of GNPs helped to retain the worn material on the contact surface and led to improved wear resistance up to the weight fraction of 3% after which non-homogeneous dispersion of GNPs occurred.