The present paper describes an unstructured hexahedral mesh generator for viscous flow simulations around complex 3D configurations. The first step of this method is the geometric adaptation of an initial non-body-fitted mesh by grid embedding. The resulting octree mesh is then fitted to the actual boundaries of the domain and its main features, such as sharp edges and corners, are captured. De...

Transitive closure operation is one of the most useful new operations in deductive database systems. When it is added to conventional relational database systems, most practical problems with recursion can be coped with. Therefore, efficient processing of transitive closure is an important task in deductive database systems. Transitive closure operation can be divided into total closure and que...

One challenge of autonomous flight is creating a system for planning routes and reacting to environments that is fast enough to take full advantage of the high speed of aircraft. This problem of obstacle avoidance is especially relevant when creating a program that lands robotic helicopters in urban environments. Since these areas are highly concentrated with static obstacles like buildings as ...

Many species of wildlife depend on riparian habitats for various life-history functions (e.g., breeding, foraging, overwintering). Although this unique habitat is critical for many species, delineations of riparian zones and buffers for various taxa are lacking. Typically when buffer zones are determined to mitigate edge effects, they are based on criteria that protect aquatic resources alone a...

Potential contamination (pollution) of surface waters with sediment, nutrients, and pesticides in agricultural runoff is an important water quality issue. Conservation tillage has been promoted and adopted by many row crop farmers because of its effectiveness in decreasing exposure to rainfall and reducing runoff and sediment loss. Vegetative filter strips (VFS), also known as buffer strips or ...

In this paper, a volume parametric model is computed from piecewise smooth skeleton. Generating stick figure S defined in 3D an intuitive process: given whose topology pseudo-graph and edges are embedded as Bézier curves R3, we propose method for creating thick “around” S. The generate based on semi-simploidal sets, which guarantees proper provides domain spaces. This continuous representation ...

Little is known about the distribution of prostaglandin E? (PGE?) and prostacyclin (PGLJ production in the canine kidney. To determine the basal and stimulated profiles of PGE^ and PGI2 production along the corticomedullary axis of the dog kidney, a slice (0.5 mm thick, 10-50 mg) was obtained from six equally spaced zones along the axis (zone 1, medullary crest; zones 2 and 3, inner medulla; zo...