The recent determination of the baryon-to-photon ratio from WMAP data by Spergel et al. (2003) allows one to fix with unprecedented precision the primordial abundances of the light elements D, He, He and Li in the framework of the standard model of big bang nucleosynthesis. We adopt these primordial abundances and discuss the implications for Galactic chemical evolution, stellar evolution and n...

This paper describes an algorithm to extract adaptive and quality 3D meshes directly from volumetric imaging data. The extracted tetrahedral and hexahedral meshes are extensively used in the Finite Element Method (FEM). A top-down octree subdivision coupled with the dual contouring method is used to rapidly extract adaptive 3D finite element meshes with correct topology from volumetric imaging ...

One of the most complex issues of the data integration is the case where there are multiple sources for the same data element. It is not easy to generate and maintain the integrated scheme. In this paper we describe a framework which encompasses the entire data integration process. The data source schemas as well as the integrated schema are expressed using an extension of an ontology definitio...

We consider the behavior of entropy of data elements as they are operated on by polar transforms. The data elements under consideration are pairs (X,Y ) where X is a binary random variable and Y is some side information about X . The entropy random variable for such a data element is defined as h(X|Y ) = − log pX|Y (X|Y ). The variance of entropy (varentropy) is defined as Var(h(X|Y )). A polar...