sulphosalts in the system agsbs2-agass2 have been experimentally investigated using dry methods. the solid solutions which form between ?-miargyrite and smithite have different structures. the epma data for the solid solution series show that there is an inverse relation between sb and as. the cell parameters of the solid solution between ?-miargyrite and smithite increase up to about 50% of...

sulphosalts in the system agsbs2-agass2 have been experimentally investigated using dry methods. the solid solutions which form between ?-miargyrite and smithite have different structures. the epma data for the solid solution series show that there is an inverse relation between sb and as. the cell parameters of the solid solution between ?-miargyrite and smithite increase up to about 50% of ag...

The popularity of medial axis in shape modeling and analysis comes from several of its well known fundamental properties. For example, medial axis captures the connectivity of the domain, has a lower dimension than the space itself, and is closely related to the distance function constructed over the same domain. We propose the new concept of a medial zone of an n-dimensional semi-analytic doma...

We have numerically investigated a three-body problem consisting of the Sun, an asteroid, and an infinitesimal particle initially placed about the asteroid. We assume that the asteroid has the following properties: a circular heliocentric orbit at R -2.55 AU, an asteroid/Sun mass ratio of/~ -5 x 10-12, and a spherical shape with radius R A -100 km; these values are close to those of the minor p...

All numerical simulations of compressible convection reveal the presence of strong downwards directed flows. Thanks to helioseismology, such plumes have now been detected also at the top of the solar convection zone, on supergranular scales. Their properties may be crudely described by adopting Taylor’s turbulent entrainment hypothesis, whose validity is well established under various condition...

We present a state of the art of techniques that can be implemented to automatically generate virtual cities (non existing ones). An urban zone constitutes a too vast volume of data to be directly understood, modeled or visualized. The multiresolution approach based on imbricated logical structures allows us to divide this volume of data into successive levels of detail.