[en] We explore aspects of the phase structure of SU(2) and SU(3) lattice gauge theories at strong coupling with many flavors N_f of Wilson fermions in the fundamental representation. The pseudoscalar meson mass as a function of hopping parameter is observed to deviate from the expected analytic dependence, at least for sufficiently large N_f. Implications of this effect are discussed, including the relevance to recent searches for an infrared fixed point.

[en] An advanced modeling technique, which allows us to compute realistic synthetic seismograms, is used to create a database of synthetic accelerograms in a set of selected sites located within Sofia urban area. The accelerograms can be used for the assessment of the local site response, represented in terms of Response Spectra Ratio (RSR). The result of this study, i.e. time histories, response spectra and other ground motion parameters, can be used for different earthquake engineering analyses. Finally, with the help of 3D finite elements modeling, the building structural performance is assessed

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