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Prodotti recenti

Degrees of Separation and Diameter in Large Graphs

The problem with computing the average distance and the diameter in the case of huge networks is the time and space complexity. For this reason, heuristics or approximation algorithms are often used.In this paper we first discuss the approximation methods for the distance distribut...

Playful learning for kids with special educational needs

It has been verified that today in the Italian schools there are about 15–20% of students presenting different kinds of “Special Educational Needs”. In order to respond to BES, the schools follow the Customized Learning Plan (PDP), a useful tool for designing operational models,&#x...

Improving the betweenness centrality of a node by adding links

Betweenness is a well-known centrality measure that ranks the nodes according to their participation in the shortest paths of a network. In several scenarios, having a high betweenness can have a positive impact on the node itself. Hence, in this article, we consider the probl...

Silver nanoparticles-based plasmonic assay for the determination of sugar content in food matrices

A simple colorimetric assay for sugars (monosaccharides, polyols and disaccharides) quantification based on silver nanoparticles (AgNPs) formation is proposed. Sugars are able to form AgNPs reducing Ag+ and stabilizing the suspension. Since the driving force is not only chemical reduction, the&#x...

A small heterobifunctional ligand provides stable and water dispersible core-shell CdSe/ZnS quantum dots (QDs)

We describe a simple method to prepare water dispersible core–shell CdSe/ZnS quantum dots (QDs) 1 by capping QDs with a new thiol-containing heterobifunctional dicarboxylic ligand 4 (DHLA-EDADA). This ligand, obtained on a gram scale through a few synthetic steps, provides a compact...

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