Computational results for an 18%-scale, semi-span Gulfstream aircraft model are presented. Exa Corporation’s lattice Boltzmann PowerFLOW® solver was used to perform time-dependent simulations of the flow field associated with this high-fidelity aircraft model. The simulations were obtained for free-air at a Mach number of 0.2 with the flap deflected at 39o (landing configuration). We focused on...

In this paper we propose a new technique for image segmentation based on contour detection using image analogies principle. A set of artificial patterns are used to locate contours of any query image. Each pattern allow the location of contours corresponding to specific intensity variation. Boundaries are extracted based on the properties of located contours. In addition, elementary regions der...

What are the features that impersonators select to elicit a speaker's identity? We built a voice database of public figures (targets) and imitations produced by professional impersonators. They produced one imitation based on their memory of the target (caricature) and another one after listening to the target audio (replica). A set of naive participants then judged identity and similarity of p...

In spirit of the well-known analogy between inviscid fluids and pseudo-Riemannian manifolds we study spherical singular hypersurfaces in the static superfluid. Such hypersurfaces turn to be the interfaces dividing the superfluid into the pairs of spherical domains, for instance, phases “ superfluid A superfluid B” or “impurity superfluid”. It is shown that these shells form the acoustic lenses ...

Analogy is a special kind of similarity (see Goldstone & Son, Chap. 2). Two situations are analogous if they share a common pattern of relationships among their constituent elements even though the elements themselves differ across the two situations. Typically, one analog, termed the source or base, is more familiar or better understood than the second analog, termed the target. This asymmetry...

Using the enterprise’s valve as the research object, the research shows the characteristics of the flow field and noise of the valve. The theory of LES and Lighthill acoustic analogy is applied to study the flow noise characteristics of 100% opening and 70% opening of valve in the same flow. The result shows that the region of variation about pressure and velocity is concentrated in the valve s...

In Space, minor forces exerted over long periods can produce major results. Force fields of various kinds can be used to build large structures, superseding the human-intensive construction techniques of today. In this paper we consider how several techniques now used in other fields can be generalized and applied to Space-based construction. Radiation pressure exerted by coherent beams on scat...