Osmaniye Korkut Ata University

About: Osmaniye Korkut Ata University is a education organization based out in Osmaniye, Turkey. It is known for research contribution in the topics: Catalysis & Neutron. The organization has 341 authors who have published 869 publications receiving 8259 citations.

A method for drawing vertical curve in longitudinal profile in road project

Abstract: In road projects, there is a difficulty in drawing tangent points of the calculated vertical curve, turning point and intermediate points due to horizontal and vertical scale differences. This prob...

Pincer Type Ditertiary Aminomethylphosphine–Pd(II) Complexes Supported on Multi-Walled Carbon Nanotube: Catalytic Properties in Heck C–C Coupling Reactions

Abstract: Pincer type aminomethylphosphine–Pd(II) complexes supported on multi-walled carbon nanotube (MWCNT) have been synthesized and characterized using X-Ray diffraction spectrometry, scanning electron microscopy, thermal analysis, energy dispersive X-Ray, Fourier transform infrared spectrometry, transmission electron microscopy (TEM) and ultraviolet–visible spectrometry techniques. The novel complexes were tried as catalysts in Heck C–C coupling reactions. The crystallite size and lattice strain of the MWCNT based compounds were calculated by the Scherrer’s equation. The optical parameters of the MWCNT based structures were analyzed and the band gap enhanced from 4.42 to 4.98 eV. Different solvents (toluene, 1,4-diooxane, DMF and NMP) and bases (Et3N, Na2CO3, NaOAc and K2CO3) were tried at different temperatures (80, 100 and 110 °C) in the cross-coupling of bromobenzene with styrene. The optimum yield was found in the presence of K2CO3, 110 °C in 1,4-dioxane solvent system.

Site Identity and Importance in Cosubstituted Bixbyite In2O3

Abstract: The bixbyite structure of In2O3 has two nonequivalent, 6-coordinate cation sites and, when Sn is doped into In2O3, the Sn prefers the “b-site” and produces a highly conductive material. When divalent/tetravalent cation pairs are cosubstituted into In2O3, however, the conductivity increases to a lesser extent and the site occupancy is less understood. We examine the site occupancy in the MgxIn2−2xSnxO3 and ZnxIn2−2xSnxO3 systems with high resolution X-ray and neutron diffraction and density functional theory computations, respectively. In these sample cases and those that are previously reported in the MxIn2−2xSnxO3 (M = Cu, Ni, or Zn) systems, the solubility limit is greater than 25%, ensuring that the b-site cannot be the exclusively preferred site as it is in Sn:In2O3. Prior to this saturation point, we report that the M2+ cation always has at least a partial occupancy on the d-site and the Sn4+ cation has at least a partial occupancy on the b-site. The energies of formation for these configurations are highly favored, and prefer that the divalent and tetravalent substitutes are adjacent in the crystal lattice, which suggests short range ordering. Diffuse reflectance and 4-point probe measurements of MgxIn2−xSnxO3 demonstrate that it can maintain an optical band gap >2.8 eV while surpassing 1000 S/cm in conductivity. Understanding how multiple constituents occupy the two nonequivalent cation sites can provide information on how to optimize cosubstituted systems to increase Sn solubility while maintaining its dopant nature, achieving maximum conductivity.

Utilization of response surfaces in the optimization of roll-pass design in hot-rolling

Abstract: The hot-rolling process is a very intense energy-consuming process, and deformation energy is one of the major cost items. The deformation energy consumed in the hot-rolling process is highly relat...

Transfer Length of Fully Bonded and Partially Bonded Prestressing Strands by Finite Element Method

Abstract: The objective of this study is to determine the transfer length of fully bonded and partially bonded prestressing strands in pretensioned I-shaped concrete beams by using 3D nonlinear finite element method. Location, bonding condition and percentage of debonding of prestressing strands, dimensions of prestressed concrete beam and material properties were obtained from an experimental study performed at Texas Tech University, and 3D nonlinear FE model was created based on these parameters. SOLID65, SOLID45, LINK8 and CONTA174 finite elements in ANSYS software were used to model short-term and long-term transfer lengths of prestressed concrete beams. Results showed that 3D nonlinear FE model captured actual strain behavior obtained experimentally. Also, transfer lengths obtained by 3D nonlinear FE model were very close to transfer lengths obtained by experimental study compared to current codes and proposed equations.