We are investigating a graph matching approach for indexing into pictorial databases using shock graphs, a symmetry-based representation of shape. Each shape (or a collection of edge elements) is represented by a shock graph. Indexing of a query into a pictorial database is accomplished by comparing the corresponding shock graph to the graphs representing database elements and selecting the bes...

Location and shape of the terrestrial bow shock are analyzed using MAGION 4 (sub satellite of INTERBALL 1) crossings of this boundary and upstream solar wind parameters measured by the WIND spacecraft. Different crossing points were mapped to the Sun Earth line and to the terminator plane using an analytical model of the planetary bow shock previously developed for the Martian bow shock investi...

We have previously predicted that coherent electromagnetic radiation in the 1–100 THz frequency range can be generated in crystalline polarizable materials when subject to a shock wave or solitonlike propagating excitation E. J. Reed et al., Phys. Rev. Lett. 96, 013904 2006 . In this work, we present analysis and molecular dynamics simulations of shock waves in crystalline NaCl which expand upo...

The macro characteristics and configurations of induced shock waves of the supersonic sprays are investigated by experimental methods. Visualization study of spray shape is carried out with the high-speed camera. The macro characteristics including spray tip penetration, velocity of spray tip and spray angle are analyzed. The configurations of shock waves are investigated by Schlieren technique...

The effect of high temperatures (above 25°C) on starch concentration and the morphology of starch granules in the grains of wheat (Triticum aestivum L.) were studied. Wheat plants of cultivars Yangmai 9 (weak-gluten) and Yangmai 12 (medium-gluten) were treated with high temperatures for 3 days at different times after anthesis. The results showed that the starch concentration of grains given a ...

We propose a new methodology to partition a natural image into regions based on the shock graph of its contour fragments. We show that these regions, or shock patch fragments, are often object fragments, thus effecting a partial segmentation of the image. We utilize shock patch fragments to recognize objects with dominant shape cues eliminating the need to segment out the entire object from the...

The analytic properties of adjoint solutions are examined for the quasi-onedimensional Euler equations. For shocked flow, the derivation of the adjoint problem reveals that the adjoint variables are continuous with zero gradient at the shock, and that an internal adjoint boundary condition is required at the shock. A Green’s function approach is used to derive the analytic adjoint solutions cor...

In this paper we investigate how to construct a shape space for sets of shock trees. To do this we construct a super-tree to span the union of the set of shock trees. This super-tree is constructed so that it both minimizes the total tree edit distance and preserves edge consistency constraints. Each node of the super-tree corresponds to a dimension of the pattern space. Individual such trees a...

Molecular dynamics simulations of fused silica at shock pressures reproduce the experimental equation of state of this material and explain its characteristic shape. We demonstrate that shock waves modify the medium-range order of this amorphous system, producing changes that are only clearly revealed by its ring size distribution. The ring size distribution remains practically unchanged during...