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Öğe CANONICAL CORRELATION ANALYSIS FOR ESTIMATION OF RELATIONSHIPS BETWEEN SOME TRAITS MEASURED AT WEANING TIME AND SIX-MONTH AGE IN MERINO LAMBS(SCIENTIFIC ISSUES NATL CENTRE AGRARIAN SCIENCES, 2011) Sahin, M.; Cankaya, S.; Ceyhan, A.In this study, canonical correlation analysis was applied to estimate the relationship between six different morphologic traits (X set - at weaning; height at withers (HW), chest depth (CD), chest width (CW), chest girth (CG) and rump width (CD)) measured at weaning and morphological traits of the six-month age (Y set - at six-month age; height at withers (HW_6), chest depth (CD_6), chest width (CW_6), chest girth (CG_6) and rump width (RW_6)) measured from 72 lambs of merino, at Marmara Animal Breeding Research Institute. First two of estimated six different canonical correlation coefficients (CCC) between the pairs of canonical variables were found significant (0.717, 0.587, P<0.05). The results obtained from canonical correlation analysis indicated that chest girth and live weight had largest contribution for the explanatory capacity of canonical variables estimated from the morphologic traits of the lambs at the weaning when compared with other body measurements, while height weight and live weight had largest contribution for the explanatory capacity of canonical variables estimated from the morphological traits of the six-month age when compared with other body measurements. The results of this study showed that chest girth and live weight measured at weaning can be used as early selection criteria for genetic improvement in merino lambs.Öğe Canonical correlation analysis for estimation of relationships between some traits measured at weaning time and six-month age in merino lambs(2011) Sahin, M.; Cankaya, S.; Ceyhan, A.In this study, canonical correlation analysis was applied to estimate the relationship between six different morphologic traits (X set - at weaning; height at withers (HW), chest depth (CD), chest width (CW), chest girth (CG) and rump width (CD)) measured at weaning and morphological traits of the six-month age (Y set - at sixmonth age; height at withers (HW_6), chest depth (CD_6), chest width (CW_6), chest girth (CG_6) and rump width (RW_6)) measured from 72 lambs of merino, at Marmara Animal Breeding Research Institute. First two of estimated six different canonical correlation coefficients (CCC) between the pairs of canonical variables were found significant (0.717, 0.587, P<0.05). The results obtained from canonical correlation analysis indicated that chest girth and live weight had largest contribution for the explanatory capacity of canonical variables estimated from the morphologic traits of the lambs at the weaning when compared with other body measurements, while height weight and live weight had largest contribution for the explanatory capacity of canonical variables estimated from the morphological traits of the six-month age when compared with other body measurements. The results of this study showed that chest girth and live weight measured at weaning can be used as early selection criteria for genetic improvement in merino lambs.Öğe Characterization of a Directionally Solidified Sn-Pb-Sb Ternary Eutectic Alloy(SPRINGER, 2015) Cadirli, E.; Sahin, M.; Turgut, Y.A Sn-40.5wt%Pb-2.6wt%Sb ternary eutectic alloy was prepared using a vacuum melting furnace and a casting furnace. The samples were directionally solidified at a constant growth rate (V = 16.5 mu m/s) under different temperature gradients (G = 1.05-3.88 K/mm) and at a constant temperature gradient (G = 3.88 K/mm) under different growth rates (V = 8.3-498 mu m/s). The effects of G and V on lamellar spacing (lambda), microhardness (HV), and ultimate tensile strength (sigma) were determined. The lamellar spacing and microhardness were measured from both longitudinal and transverse sections of the sample. The relationships between solidification parameters (G, V), microstructure parameters (lambda(L), lambda(T)), and mechanical properties (HV, sigma) were determined from linear regression analysis. It was found that the microhardness and tensile strength increase with increasing G and V as well as with decreasing lambda.Öğe Dependence of electrical and thermal conductivity on temperature in directionally solidified Sn-3.5 wt% Ag eutectic alloy(SPRINGER, 2011) Cadirli, E.; Sahin, M.; Kayali, R.; Ari, M.; Durmus, S.Sn-3.5 wt% Ag alloy was directionally solidified upward with a constant growth rate (V = 16.5 mu m/s) and a temperature gradient (G = 3.3 K/mm) in a Bridgman-type growth apparatus. The variations of electrical resistivity (rho) with temperature in the range of 293-476 K for the directionally solidified Sn-3.5 wt% Ag eutectic alloy was measured. The measurements indicate that the electrical resistivity of the directionally solidified Sn-Ag eutectic solder increases with increasing temperature. The variations of thermal conductivity of solid phases versus temperature for the same alloy was determined from the Wiedemann-Franz and Smith-Palmer equations by using the measured values of electrical conductivity. From the graphs of electrical resistivity and thermal conductivity versus temperature, the temperature coefficient of electrical resistivity (alpha (TCR) ) and the temperature coefficient of thermal conductivity (alpha (TCT) ) for the same alloy were obtained. According to experimental results, the electrical and thermal conductivity of Sn-Ag eutectic solder linearly decrease with increasing the temperature. The enthalpy of fusion (Delta H) and the change of specific heat (Delta C (P) ) during the transformation at the studied alloy were determined from heating curve during the transformation from eutectic solid to eutectic liquid by means of differential scanning calorimeter (DSC).Öğe Effects of Cooling Rate and Composition on Mechanical Properties of Directionally Solidified Pb100-x-Sn-x Solders(SPRINGER, 2011) Cadirli, E.; Kaya, H.; Sahin, M.Pb100-x-Sn-x solders (x = 5 wt.%, 10 wt.%, 20 wt.%, 35 wt.%, 50 wt.%, 60 wt.%, 61.9 wt.%, and 95 wt.%) were directionally solidified upward over a wide range of cooling rates (T) over dot (0.016 K s(-1) to 4.0 K s(-1)) by using a Bridgman-type directional solidification furnace. Microstructure parameters (primary dendrite arm spacing, lambda(1), and eutectic spacing, lambda(E)) and mechanical properties (microhardness, HV, and ultimate tensile strength, sigma) of the Pb100-x-Sn-x alloys were measured. The dependences of the microhardness and ultimate tensile strength on the cooling rate, microstructure parameters, and composition were determined. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples increase with increasing cooling rate and Sn content, but decrease with increasing microstructure parameters.Öğe Influence of temperature gradient and growth rate on the mechanical properties of directionally solidified Sn-3.5 wt% Ag eutectic solder(SPRINGER, 2012) Cadirli, E.; Sahin, M.The Sn-3.5 wt% Ag eutectic alloy was directionally solidified upward with a constant growth rate (V = 16.5 mu m/s) at different temperature gradients (G = 1.43-4.28 K/mm) and with a constant temperature gradient (G = 3.93 K/mm) at different growth rates (V = 8.3-500 mu m/s) in a Bridgman-type directional solidification furnace. The rod spacings (longitudinal section, lambda (L) and transverse section, lambda (T) ) and mechanical properties (microhardness, HV and ultimate tensile strength, sigma (UTS) ) of Sn-3.5 wt% Ag eutectic alloy were measured. The dependency of the microhardness, ultimate tensile strength on the temperature gradient, growth rate and rod spacings were determined. According to experimental results, the microhardness and ultimate tensile strength of the solidified samples increase with increasing G and V, but decrease with the increasing the rod spacing.Öğe INFLUENCE OF THE SOLIDIFICATION PARAMETERS ON DENDRITIC MICROSTRUCTURES IN UNSTEADY-STATE DIRECTIONALLY SOLIDIFIED OF LEAD-ANTIMONY ALLOY(WORLD SCIENTIFIC PUBL CO PTE LTD, 2010) Sahin, M.; Cadirli, E.; Kaya, H.Pb-9.3wt.%Sb alloy was directionally solidified upwards under argon atmosphere under the two conditions; with different temperature gradients, (G = 0.93-3.67K/mm) at a constant growth rate (V = 17.50 mu m/s) and with different growth rates (V = 8.30-497.00 mu m/s) at a constant (G = 3.67 K/mm) in a Bridgman furnace. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (lambda(1)), secondary dendrite arm spacing (lambda(2)) and dendrite tip radius (R) on the growth rate (V) and the temperature gradient (G) were determined by using a linear regression analysis. A detailed analysis of microstructure were also made and compared with the theoretical models and similar experimental works on dendritic solidification in the literature.Öğe Mechanical, electrical, and thermal properties of the directionally solidified Bi-Zn-Al ternary eutectic alloy(SPRINGER, 2014) Sahin, M.; Cadirli, E.A Bi-2.0Zn-0.2Al (wt%) ternary eutectic alloy was prepared using a vacuum melting furnace and a casting furnace. The samples were directionally solidified upwards at a constant growth rate (V = 18.4 mu m/s) under different temperature gradients (G = 1.15-3.44 K/mm) and at a constant temperature gradient (G = 2.66 K/mm) under different growth rates (V = 8.3-500 mu m/s) in a Bridgman-type directional solidification furnace. The dependence of microstructure parameter (lambda) on the solidification parameters (G and V) and that of the microhardness (Hv) on the microstructure and solidification parameters were investigated. The resistivity (rho) measurements of the studied alloy were performed using the standard four-point-probe method, and the temperature coefficient of resistivity (alpha) was calculated from the rho-T curve. The enthalpy (Delta H) and the specific heat (C (p) ) values were determined by differential scanning calorimetry analysis. In addition, the thermal conductivities of samples, obtained using the Wiedemann-Franz and Smith-Palmer equations, were compared with the experimental results. The results revealed that, the thermal conductivity values obtained using the Wiedemann-Franz and Smith-Palmer equations for the Bi-2.0Zn-0.2Al (wt%) alloy are in the range of 5.2-6.5 W/Km and 15.2-16.4 W/Km, respectively.Öğe Thermo-electrical properties in Pb-Sb hypereutectic alloy(KOREAN INST METALS MATERIALS, 2013) Sahin, M.; Cadirli, E.; Surme, Y.; Ozkir, D.Pb-17 wt% Sb hypereutectic alloy was directionally solidified upward with three different growth rates (8 mu m/s, 18 mu m/s, 42 mu m/s, 166 mu m/s and 497 mu m/s) at a constant temperature gradient (3.6 K/mm) in the Bridgman-type growth apparatus. The dependence of characteristic microstructure parameters such as primary dendrite arm spacing (lambda(1)) and secondary dendrite arm spacing (lambda(2)) on the growth rate (V) were determined by using a linear regression analysis. Variations of electrical resistivity (rho) for cast samples for temperatures in the range of 300-550 K were measured by using a standard dc four-point probe technique. The variations of thermal conductivity with temperature for the same alloys were determined from the WiedemannFranz and SmithPalmer equations by using the measured values of electrical resistivity. The enthalpy of fusion for the same alloys were determined by means of a differential scanning calorimeter from a heating trace during the transformation from solid to liquid. The corrosion resistance was analyzed by Tafel extrapolation and linear polarization resistance methods conducted in a 5% sodium chloride solution in contact with air maintained at room temperature. Effects of the growth rate on the electrical resistivity and corrosion resistance were also investigated.
