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The vibration phenomenon represents the cause of many problems in metal cutting processes. It has a big influence on the quality of the machining operation, tool life and machine precision. Drilling operation is a common metal cutting process where quality of the hole form is often a critical issue. Therefore, it was necessary to predict these vibrations.(More)
Chitosan biofilms, prepared by casting method at various percentage of plasticizer (PEG and glycerol), were evaluated for their biological, structural and thermal properties. The addition of PEG at 30% (w/w) and glycerol at 10% (w/w) to chitosan has increased the antioxidant activity of biofilm with the percentages of 22 and 26%, respectively. The increase(More)
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