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A Methodology to Determine the Friction Coefficient in Flexforming (Fluidcell Forming) Process
H.Ali Hatipo?lu,Naki Polat,Arif Koksal 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In this study, it is aimed to determine the friction coefficient between die surface and blank in flexforming (fluidcell forming) process in which a pressurized rubber diaphragm is used to form the sheet. An aluminum square pan is chosen for the workpiece and it is drawn at various pressures and friction conditions (with lubricant, without lubricant, etc.). Numerical models of the process are established with different friction coefficients and results are then compared with the experiments in order to determine the corresponding coefficients of the friction conditions. The displacement of the flange edge is used for comparison.
Evaluation of Mixtures of Certain Market Wastes as Silage
Ozkul, H.,Kilic, A.,Polat, M. Asian Australasian Association of Animal Productio 2011 Animal Bioscience Vol.24 No.9
The aim of this study was to determine the usefulness of vegetable wastes as silage for ruminants. Varying amounts of wheat straw (WS), wheat bran (WB) and salt (S) were combined with minced vegetable wastes (VW) during ensilage. Seven different ingredient combinations were investigated viz: 100% VW (Group I, control), 90% VW+9% WS+1% S (Group II), 80% VW+15% WS+4% WB+1% S (Group III), 70% VW+20% WS+9% WB+1% S (Group IV), 90% VW+9% WB+1% S (Group V), 80% VW+15% WB+4% WS+1% S (Group VI) and 70% VW+20% WB+9% WS+1% S (Group VII). The inclusion of straw and bran increased (p<0.01) the DM content of silage. The highest contents of the pure silage were CP (p<0.001), EE (p<0.01) and NFE (p<0.05). NDF contents of VW silage and group V were significantly lower and especially the VW silage was found to have the lowest ADL content (p<0.01). The in vitro ME values of VW silage and bran added silage were higher than other groups (p<0.01). pH, lactic acid and acetic acid values of silage groups were changed between 4.09-4.20, 2.43-3.46% and 0.60-0.86%, respectively. In conclusion, different mixtures of VW have a high ensilage capacity and can serve as an alternative roughage source for ruminants. The addition of 9% bran significantly improved the silage in view of both dry matter content and nutritive value.
Ferdi. Akman,H. Ogul,I. Ozkan,M.R. Kaçal,O. Agar,H. Polat,K. Dilsiz 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
Advanced radiation applications have been widely used and extended to many fields. As a result of thisfact, choosing an appropriate shielding material based on the radiation application has become vital. Inthis regard, the integration of elements into polymer composites has been investigated and contributedto the quantity and quality of radiation shielding materials. This study reports photon attenuation parametersand electromagnetic shielding effectiveness of a novel polymer composite prepared with amatrix reinforced with three different proportions (5, 10, and 15 wt%) of niobium content. Addition of Nbdopant improves both photon attenuation and electromagnetic shielding effectiveness for the investigatedcomposites. Therefore, Nb(15%) polymer composite with highest concentration has been found tobe the best absorber for ionizing and non-ionizing radiations. Consequently, the performed analyzesprovide evidences that the prepared Nb-reinforced polymer composite could be effectively used asphoton radiation attenuator and electromagnetic shielding material