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Öğe Determination of onset of yield due to material properties in a heat generating two-layered compound cylinder(2013) Ozturk A.; Gulgec M.In this theoretical study, based on Tresca's yield criterion and its associated flow rule, the elastic deformation of a centrally heated compound cylinder with fixed ends is investigated analytically by taking into consideration not only the geometrical but also the material parameters such as yield strength, modulus of elasticity, Poisson's ratio, thermal conductivity and coefficient of thermal expansion. These material parameters are assumed to be independent of the temperature. The compound cylinder is assumed to be very long such that axisymmetric condition exists. Both of the constituent materials of the two layers are supposed to be elastic-perfectly plastic materials. There is heat generation in the interior solid cylinder but no heat generation in the outer hollow cylinder. Both of the cylinders are assumed to be bounded perfectly at the interface. Elastic stress analysis is performed to prevent yield in the compound cylinder. © (2013) Trans Tech Publications, Switzerland.Öğe Effect of supplementation of ovine oviductal cells with LH and gestradiol-17? on embryo development(2008) Ciftci H.B.; Zulkadir U.; Boztepe S.; Ozturk A.; Dag B.; Yetisir R.The aim of this research was to study the effect of supplementing the oviductal cells with Luteinizing hormone (LH) and Oestradiol - 17? (E 2) on sheep embryo development in vitro. Addition of 5?g/ml LH, 5?g/ml E2 to embryo culture significantly increased the percentage of embryos over the control group. Addition of LH and E2 to the culture of zygotes containing oviductal cells, caused further significant increases in the percentages embryos at morulae, blastocyst and hatched stages over the control and LH-E2 added group by 28.75, 19.88 8.89% and 15.58, 11.91, 6.39% respectively.Öğe The use of stereophotogrammetry in oral surgery: Measurement of area changes after secondary epithelization and grafting vestibuloplasties(2012) Ozturk A.; Dolanmaz D.; Celik S.; Isik K.; Karabork H.; Yildiz F.; Yakar M.Objective: Stereophotogrammetry (SPT) is a method in which three-dimensional coordinates are calculated from multiple two-dimensional projections. The purpose of this study was to compare the surface area changes between the secondary healing and grafting vestibuloplasty techniques in the mandible by using a stereophotogrammetric technique (SPT). Patients and Methods: Thirteen patients were included in this study: six patients were managed by using full-thickness skin or palatal mucosa grafts (two full-thickness palatal mucosal grafts and four full-thickness skin grafts); the remaining seven patients, who did not accept a second surgery for graft harvesting, underwent secondary epithelization vestibuloplasties. Postoperative changes of surgical areas were measured by using SPT. Statistical Analyses: The Wilcoxon (intragroup comparisons) and Mann-Whitney U (intergroup comparisons) tests were used for analysis of data. Results: In the grafting vestibuloplasty group, the surface area gain was statistically significant (P < 0.05). In the secondary epithelization vestibuloplasty group, there was no significant difference (P > 0.05), with even decrease of surface area being noted in some cases. Conclusion: SPT is a valid method for measurement of intraoral soft tissue changes.
