Matej Bel University

About: Matej Bel University is a education organization based out in Banská Bystrica, Slovakia. It is known for research contribution in the topics: Tourism & Fuzzy set. The organization has 721 authors who have published 1497 publications receiving 11573 citations. The organization is also known as: Matej Bel & Univerzita Mateja Bela.

Lifting Graph Automorphisms by Voltage Assignments

Abstract: The problem of lifting graph automorphisms along covering projections and the analysis of lifted groups is considered in a purely combinatorial setting. The main tools employed are: (1) a systematic use of the fundamental groupoid; (2) unification of ordinary, relative and permutation voltage constructions into the concept of a voltage space; (3) various kinds of invariance of voltage spaces relative to automorphism groups; and (4) investigation of geometry of the lifted actions by means of transversals over a localization set. Some applications of these results to regular maps on surfaces are given. Because of certain natural applications and greater generality, graphs are allowed to have semiedges. This requires careful re-examination of the whole subject and at the same time leads to simplification and generalization of several known results.

A Global Snapshot of Computer Science Education in K-12 Schools

Abstract: In two special issues of the ACM journal "Transactions on Computing Education" (TOCE), 14 extensive case studies about the various situations of Computer Science Education (CSE) in K-12 schools in 12 countries (respectively states) were collected. During the work at the ITiCSE 2015, we have performed a deductive qualitative text analysis on these case studies in order to extract the most useful information. As a category system, we applied some selected categories of the Darmstadt Model that was developed by the working group "Computer Science/Informatics in Secondary Schools" at the ITiCSE 2011. Based on the coding results, we summarized information about the different fields of Computing Education at schools, the intended goals and competencies, the taught content, the applied programming languages and tools and the different forms of assessment and teacher education. Despite the limitations of the analyzed articles, representing just snapshots of complex situations from the specific viewpoint of the respective authors, we were able to collect some interesting results.

The DIRAC code for relativistic molecular calculations

Abstract: DIRAC is a freely distributed general-purpose program system for one-, two-, and four-component relativistic molecular calculations at the level of Hartree–Fock, Kohn–Sham (including range-separated theory), multiconfigurational self-consistent-field, multireference configuration interaction, electron propagator, and various flavors of coupled cluster theory. At the self-consistent-field level, a highly original scheme, based on quaternion algebra, is implemented for the treatment of both spatial and time reversal symmetry. DIRAC features a very general module for the calculation of molecular properties that to a large extent may be defined by the user and further analyzed through a powerful visualization module. It allows for the inclusion of environmental effects through three different classes of increasingly sophisticated embedding approaches: the implicit solvation polarizable continuum model, the explicit polarizable embedding model, and the frozen density embedding model.

Miscanthus as a Productive Biofuel Crop for Phytoremediation

Abstract: There are many locations where soil quality improvements would be beneficial because of contamination, erosion, flooding, or past human activities. Miscanthus, a C-4 grass related to sugarcane, grows well in mildly contaminated soil and on sites where soil quality is poor, particularly with respect to nitrogen. Because of its high biomass yield, it is of interest as an energy crop, and as a plant to use for simultaneous crop production and phytoremediation. Here we review recent literature on using miscanthus for combined biomass production and phytoremediation of contaminated and marginal lands. We analyze both advantages and disadvantages for production of this crop along with phytoremediation of sites contaminated with metals and petroleum hydrocarbon. Reports of laboratory and field investigations, which use Miscanthus spp. for stabilizing and removing metals are considered. The potential for growing miscanthus commercially at contaminated and marginal sites in the regions of Central and Eastern Europ...