potential field images obtained in potential field data measurements are suitable tools for mineral and hydrocarbons resources explorations. these images consist of different anomalies which in many cases are contaminated with noise. the horizontal location of the boundaries of potential field anomaly sources is of interest in potential field interpretation. however, the edge of potential field...

The answer to the main research question on how wildlife is officially classified in South Africa lies in the process of boundary making. Within this work I have dissected boundary making into three particular types of boundaries, namely material boundaries, policy boundaries and imagined boundaries. I noted that the three boundaries are closely related and sometimes overlapping. Stemming from ...

The relation between two elastic continuum approaches to grain boundary structure, the dislocation and disclination models, is discussed. It is shown that the disclination model has two advantages: a well-behaved expression for the elastic energy of disclination dipole walls, which describes the elastic energy over a wide interval of misorientations, and a continuous misorientation angle depend...

This paper deals with the mathematical modelling of the contact angle of a metal strip supported by periodically assembled rolls, as it is often the case in strip processing plants. The derivation of the governing differential equation is carried out by means of the calculus of variations for moving boundaries. An ideal-elastic-idealplastic material law of a periodic bending cycle is introduced...

The misorientation of 515 grain boundaries has been determined using electron backscatter diffraction data from an 18 μm thick copper foil with columnar structure and a preferential {110} surface orientation. energy the was dihedral angles in vicinity boundary thermal grooves. experimental vs. angle shows deep minima for low-angle small corresponding to Σ3 Σ9 boundaries. Only fraction coinciden...

the full annealing aa6061 aluminum alloy was subjected to severe plastic deformationvia the combination of equal channel angular pressing (ecap) and cold rolling (cr) in order torefine its microstructure and to improve its mechanical properties. according to the results of hotand cold tensile tests, the combination of ecap and cr significantly affected the final strengthand ductility of studied...

Based on electron backscattered diffraction analysis and transmission electron microscopy observation, the mechanism of inhomogeneous grain refinement in a NiTiFe shape memory alloy (SMA) subjected to single-pass equal-channel angular extrusion (ECAE) was investigated. The results show that refined grains are mainly nucleated near grain boundaries and a small fraction of them emerges in the gra...

Deformation of the semisolid mush during solidification is a common phenomenon in metal casting and can lead to defects such as hot tears, macrosegregation, and porosity. The morphology of the solidifying mush, including the shape of the dendrites and the distribution of grain boundaries, plays a key role in determining its mechanical behavior. In the current study, a polycrystalline phase-fiel...