The type of representation used in describing shape can have a significant impact on the effectiveness and efficiency of a recognition strategy. Shape has been represented by a point set, outline curve and the shock graph (or medial axis). The curve-based representation can be viewed as point-based representation with additional organization, namely, order along a contour; shock-based represent...

We study dynamic reshaping of lipid vesicles under osmotic shocks via molecular dynamics simulations. identified rich morphology transformations, and observed a separation time scales between the shock absorption shape relaxation.

We derive expressions for shock formation based on the local curvature of the flow characteristics during dynamic compression. Given a specific ramp adiabat, calculated for instance from the equation of state for a substance, the ideal nonlinear shape for an applied ramp loading history can be determined. We discuss the region affected by lateral release, which can be presented in compact form ...

1077-3142/$ see front matter 2011 Elsevier Inc. A doi:10.1016/j.cviu.2010.12.011 ⇑ Corresponding author. E-mail address: [email protected] (D. Macrini) The recognition of 3-D objects from their silhouettes demands a shape representation which is stable with respect to minor changes in viewpoint and articulation. This can be achieved by parsing a silhouette into parts and relationships that do...

Abstract We earlier introduced an approach to categorical shape description based on the singularities (shocks) of curve evolution equations. The approach relates to many techniques in computer vision, such as Blum's grass re transform, but since the motivation was abstract, it is not clear that it should also relate to human perception. We now report that this shock-based computational model c...

The Gamma-Ray burst (GRB) afterglow transition is one of the most interesting and least studied GRB phases. During this phase the relativistic ejecta begins interacting with the surrounding matter. A strong short lived reverse shock propagates into the ejecta (provided that it is Baryonic) while the forward shock begins to shape the surrounding matter into a Blandford-McKee profile. We suggest ...

The AED delivered wrongful shocks, probably because the tachyarrhythmia with QRS complexes of low amplitude was considered to be ventricular fibrillation. Evidence for this comes from the ECG strips from the first AED rhythm analysis, clearly showing QRS complexes of a similar shape and amplitude, but at a lower rate. Furthermore, these small QRS complexes were continuously found from the start...

In this paper, a problem of shape design for a duct with the flow governed by the one-dimensional Euler equations is analyzed. The flow is assumed to be transonic, in the sense that we have a shock embedded in the flow. The presence of the shock introduces analytical and numerical difficulties that are overcome by introducing the shock location as an explicit state variable. We justify the use ...

Abstract. A novel numerical technique for the solution of the compressible flow equations over unstructured grids in a cylindrical reference is presented. The proposed approach is based on a mixed finite volume / finite element method. Equivalence conditions relating the finite volume and the finite element metrics in cylindrical coordinates are derived. Numerical simulations of the explosion a...

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