scholarly journals Boundary segmentation of naturalistic textures: Roles of sparseness and local phase structure

2010 ◽  
Vol 9 (8) ◽  
pp. 1042-1042
Author(s):  
E. Arsenault ◽  
A. Yoonessi ◽  
C. Baker
Keyword(s):  
Phase Structure ◽  
Local Phase

The motion and structure of dislocations in wavefronts

1981 ◽  
Vol 378 (1773) ◽  
pp. 219-239 ◽  
Keyword(s):  
Plane Wave ◽  
Phase Structure ◽  
General Type ◽  
Dislocation Line ◽  
Theoretical Framework ◽  
Time Of Arrival ◽  
Scalar Wave ◽  
Local Phase ◽  
Radial Line ◽  
Line Singularities

Scattered scalar wavefields contain line singularities where the phase of the wave is indeterminate and the amplitude is zero. Unless the wave is monochromatic, these dislocation lines, which are analogous to crystal dislocations, move along trajectory surfaces, changing their positions relative to the wave by glide and climb. The edge–screw character of a given dislocation varies along its length and as it moves. When it has no close neighbours its glide and screwness, and the way they change, are completely determined by the distribution over the trajectory surface of two scalar quantities: the phase of the dislocation and its time of arrival. It is shown how even the most general type of dislocation may be con­sidered to be carried, locally, by a plane wave, whose orientation relative to the trajectory determines the climb of the dislocation. Around a general isolated dislocation the equiphase surfaces form a helicoid; they are equally spaced along any radial line, but with a discontinuity of π across the dislocation line itself. The paper provides a theoretical framework for understanding the local phase structure and the motion of any dislocation in a scalar wave.

Effect of cluster-gradient architecture of nanostructured topocomposites on features of tribointeraction with heterophased material

2020 ◽  
pp. 130-135
Author(s):  
D.N. Korotaev ◽  
K.N. Poleshchenko ◽  
E.N. Eremin ◽  
E.E. Tarasov
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Energy Dissipation ◽  
Phase Structure ◽  
Diffusion Processes ◽  
Structural Phase ◽  
High Wear Resistance ◽  
Wear Characteristics ◽  
And Diffusion

The wear resistance and wear characteristics of cluster-gradient architecture (CGA) nanostructured topocomposites are studied. The specifics of tribocontact interaction under microcutting conditions is considered. The reasons for retention of high wear resistance of this class of nanostructured topocomposites are studied. The mechanisms of energy dissipation from the tribocontact zone, due to the nanogeometry and the structural-phase structure of CGA topocomposites are analyzed. The role of triboactivated deformation and diffusion processes in providing increased wear resistance of carbide-based topocomposites is shown. They are tested under the conditions of blade processing of heat-resistant titanium alloy.

Microheterogeneous Polyetherhydroxylurethane Elastomers with Controlled Phase Structure for Structural Adhesives

2019 ◽  
Vol 92 (10) ◽  
pp. 1342-1350 ◽  
Author(s):  
V. N. Strel’nikov ◽  
V. Yu. Senichev ◽  
A. I. Slobodinyuk ◽  
A. V. Savchuk ◽  
E. V. Pogorel’tsev
Keyword(s):  
Phase Structure ◽  
Structural Adhesives

Miscibility and Crosslinking of Polybutadiene-Based Polyurethanes

2000 ◽  
Vol 65 (11) ◽  
pp. 1820-1832
Author(s):  
Miloslav Pekař ◽  
Pavel Kopecký
Keyword(s):  
Phase Structure ◽  
Initial Mixture ◽  
Cooperative Effect ◽  
Final Phase ◽  
Elastic Part ◽  
Hard Segments

Rheokinetics of polybutadiene-based polyurethanes was studied. Sixteen mixtures differing in the miscibility of reactive components and hard segments contents were prepared. Regardless of the miscibility of the components, the rheokinetics behaviour is qualitatively very similar. The viscous response part is formed and finished much earlier than the elastic part. The quantitative dissimilarities, caused by cooperative effect of miscibility and differences in reactivity, are described. Using a well miscible initial mixture need not give the best results as a reactive crosslinker can easily react with isocyanate and separate from the rest of the reaction mixture thus impairing the final phase structure.

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