Projective geometry provides the preferred framework for most implementations of Euclidean space in graphics applications. Translations and rotations are both linear transformations in projective geometry, which helps when it comes to programming complicated geometrical operations. But there is a fundamental weakness in this approach — the Euclidean distance between points is not handled in a s...

The viscoelastic deformation of tire rubber by road surface asperities was modeled by the rolling contact between a Kelvin solid and a surface motif, which is the part of surface profiles between two peaks. Stress and strain calculations showed that contact losses might occur locally, depending on the rolling speed, the viscoelastic properties of the Kelvin solid and the geometry of the motif. ...

The logistics resources (in the form of spare parts) for future exploration missions to the Moon and Mars can have significant mass and volume requirements. In this study it is shown that reconfigurable or common parts, that allow use of the same component in different mission elements, can be a means of reducing the required number of spares. A model for determining the system availability as ...

This paper presents a 3D echocardiographic image segmen-tation procedure based on deformable surfaces. We rst propose to adapt ltering techniques to the cylindrical geometry of several 3D ultrasound image devices. Then we compare the eeect of diierent external forces on a surface template deformation inside volumetric echocardiographic images. An original method involving region grey-level anal...

Surface mount technology holds many benefits but there is no room for sloppy practices; SMT assemblies need the control that semiconductor processing uses. Extreme care must be taken at the start of a design to identify all stress zones and orient components to minimize damage. TECHNICAL INFORMATION

Whole brain segmentation and cortical surface parcellation are essential in understanding the brain’s anatomicalfunctional relationships. Multi-atlas segmentation has been regarded as one of the leading segmentation methods for the whole brain segmentation. In our recent work, the multi-atlas technique has been adapted to surface reconstruction using a method called Multi-atlas CRUISE (MaCRUISE...

The current work considers the multi-scale nature of surface roughness in a new model that predicts the real area of contact and surface separation as functions of load. This work is based upon a previous rough surfacemulti-scale contactmodelwhichused stackedelastic–plastic spheres tomodel themultiple scales of roughness. Instead, this work uses stacked 3D sinusoids to represent the asperities ...

That is the daily challenge for the operators of the giant dump trucks used in surface mines. As a result, each year, an average of 20 accidents and three fatalities occur involving collisions between a piece of surface mining haulage equipment and either a smaller vehicle, a worker, or some other object. Another 21 accidents occur and three mining equipment operators are killed each year when ...

This project is a part of collaboration between APL and NRL, which involves both theoretical study of volume-roughness interactions and water tank measurements of scattering from various fabricated physical models, such as plates with rough surface and various inclusions in their volume, to imitate scattering from the littoral ocean bottom (e.g., rough sandy sediments with inclusions of shells,...