In the science of physics the interrelation of physical theory, model and experiment is hard to comprehend, therefore group learning becomes more important. This fact, combined with the opportunity to work on practical experiences over distance in a collaboratively way, has raised worldwide the interest of creating new learning environments based on 3D virtual worlds. This paper outlines an eva...

Internet has revolutionized many aspects of our everyday life. Education could not stay intact; Internet has introduced the great ability of distance learning, which allows the traditional educational process to overcome several limitations. Among the requirements that accrue naturally, is the assessment of the results for the new type of educational process. This requirement is denoted as dist...

This paper presents an initial analysis of the duration and effort data collected during the migration of WinEcon, a large-scale CAL package to WWW-based delivery. The paper reviews the data collected during the initial development of WinEcon before presenting the preliminary data collected during the recent migration. The data presented represents a snapshot of the data collection process towa...

We present results regarding row and column spaces of matrices whose entries are elements of residuated lattices. In particular, we define the notions of a row and column space for matrices over residuated lattices, provide connections to concept lattices and other structures associated to such matrices, and show several properties of the row and column spaces, including properties that relate ...

In this paper, we propose a new path-based multicast algorithm that is called Row/Column-First algorithm. The proposed algorithm constructs a set of multicast paths to deliver a multicast message to all multicast destination nodes. The set of multicast paths are all of row-first or column-first subcategories to maximize the multicast performance. The selection of row-first or column-first appro...

Magnetic and superconducting ground states can compete, cooperate and coexist. MnP provides a compelling and potentially generalizable example of a material where superconductivity and magnetism may be intertwined. Using a synchrotron-based non-resonant X-ray magnetic diffraction technique, we reveal a spiral spin order in MnP and trace its pressure evolution towards superconducting order via m...