Formation of stray grain defects particularly around re-entrant features of the turbine blade airfoils is one of the major problems in directional and single crystal solidification processes. In this work, directional solidification tests of the GTD-111 Ni-based superalloy were conducted at different withdrawal velocities of 3, 6 and 9 mm.min-1 using various stepped cylindrical and cubic design...

A majority of neurons in the monkey primary visual cortex (V1) are tuned to stimulus orientations. Preferred orientations and tuning strengths vary among V1 neurons. The preferred orientation of neurons gradually changes across the cortex with occasional failures of this organization. How V1 neurons are arranged by the strength of orientation tuning and whether neuronal arrangement for tuning s...

The preferred orientations around the internucleotide P-0(3’)(0’) and P-O(5)(w) bonds of the phosphodiester which link the successive nucleotide residues are crucial in discerning the helical as well as nonhelical bend conformations of nucleic acids and polynucleotides. Experimental investigations other than the single-crystal x-ray diffraction methods are unable to provide directly information...

Abstract Anisotropy plays a significant role in engineering, especially the field of sheet metal forming. This particular characteristic stems mainly from crystallographic structure metals and influence rolling process, inducing preferred orientations grains. In this context, crystal plasticity theory an important as it accounts for anisotropic nature elastic tensor orientation dependencies def...

Different polytypes (α-SiC and β-SiC) and crystallographic orientations ((0001) and (11-20) of 6H-SiC) have been used in order to elaborate Silicon Carbide (SiC) nanopillars using inductively coupled plasma etching method. The cross section of the SiC pillars shows a rhombus, pentagon, or hexagonal morphology depending on polytypes and crystallographic orientations. The favored morphologies of ...

A nickel-based single-crystal superalloy was employed to investigate the preferred growth orientation behavior of the (γ + γ') eutectic and the effect of these orientations on the segregation behavior. A novel solidification model for the eutectic island was proposed. At the beginning of the eutectic island's crystallization, the core directly formed from the liquid by the eutectic reaction, an...