Introduction There are many heterogeneities among preexisting informations sources, such as DataBases (DBs), particularly semantic heterogeneities (see our chapter “Semantic Heterogeneity” in [1]). Any secure Federated Information Systems (FIS) must solve them, and deal with a): how schema levels are related to security, and b): operations on schemas to convert from level to level. We present t...

We study the ground-state spatial heterogeneities of the Edwards-Anderson spin-glass model with both bimodal and Gaussian bond distributions. We characterize these heterogeneities by using a general definition of bond rigidity, which allows us to classify the bonds of the system into two sets, the backbone and its complement, with very different properties. This generalizes to continuous distri...

The increasing amount of information available for biomedical research has led to issues related to knowledge discovery in large collections of data. Moreover, Information Retrieval techniques must consider heterogeneities present in databases, initially belonging to different domains-e.g. clinical and genetic data. One of the goals, among others, of the ACGT European is to provide seamless and...

As the geographic information system (GIS) community grows, more and more people needs to share geographic information. As modern GIS data is stored in geographic databases their conceptual schemas have to be, at least, interoperable. Due to the fact that the databases are designed by many different people from different countries, using different languages and maybe with different definitions ...

Electrostatics play a key role in biomolecular assembly. Oppositely charged biomolecules, for instance, can be coassembled into functional units, such as DNA and histone proteins into nucleosomes and actin-binding protein complexes into cytoskeleton components, at appropriate ionic conditions. These cationic-anionic coassemblies often have surface charge heterogeneities that result from the del...

Model transformations play a key role in the vision of ModelDriven Engineering. Nevertheless, mechanisms like abstraction, variation and composition for specifying and applying reusable model transformations – like urgently needed for resolving recurring structural heterogeneities – are insufficiently supported so far. Therefore, we propose to specify model transformations by a set of pre-defin...

To model the effects of volume heterogeneities in 1) scattering from sand sediments and 2) in sound propagation within those sediments. A better understanding of the role of heterogeneities in both scattering and propagation could lead to improvements in sediment characterization using remote sensing techniques as well as in high-frequency detection of mine and mine-like targets resting on or b...

The real-space dynamics in a model system of colloidal hard spheres was studied by means of time-resolved fluorescence confocal scanning microscopy. Direct experimental evidence for the presence of dynamical heterogeneities in a dense liquid was obtained from an analysis of particle trajectories in two-dimensional slices of the bulk sample. These heterogeneities manifest themselves as a non-Gau...