In this paper, we present a new algorithm for computing in a very efficient way the real intersection of three quadric surfaces. Our approach is based on the cylindrical decomposition ([4]) and the TOP algorithm ([10]) for analyzing the topology of a planar curve. We preform a symbolic pre-processing that allows us later to execute all numerical computations in a very accurate way.

Composites were fabricated by infiltration of molten Al–13Si–9Mg into porous SiC derived from wood. The composite microstructure retains the heterogeneous orthorhombic symmetry of the initial wood material. As compared to the uninfiltrated SiC preform, the composite shows much improved transverse compressive strength and stiffness, resulting in reduced anisotropy. 2006 Acta Materialia Inc. Publ...

A novel Regularising Ensemble Kalman filter Algorithm based on the Bayesian paradigm was applied to RTM processes estimate local porosity and permeability of fibrous reinforcements using measured values resin pressure flow front positions during injection. The algorithm allows detect locations defects in preform. It tested virtual experiments with two geometries, a two-dimensional rectangular p...

The application of Fibre-Reinforced Plastics is important in many engineering areas, but vital for the aerospace industry. This work shows how inline metrology can contribute to a feasible production of composite parts. An inspection system based on a Machine Vision System will be presented as a key-component for the automatic construction of complex Preform structures.

We report on the optical spectroscopy of monolithic fiber preform prepared from nanoporous bismuth-doped silica glass. The experiments reveal the existence of at least two different types of active centers and clearly demonstrate that the presence in the glass matrix of other dopant is not necessary to obtain the near-IR photoluminescence connected to Bismuth.