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School prevention and high-risk behaviour of children in cyberspace
Gal, Alena ; Valenta, Josef (advisor) ; Koťa, Jaroslav (referee)
(in English): The virtual world is becoming more a part of our reality nowadays. Even children are coming into it and they are losing the ability to distinguish between the real and the virtual world. The virtual world is then an absolutely natural thing for them, including the advantages and risks that it brings. The aim of this master thesis was to collect present opinions and views on the conception of specific primary prevention in the area of cyberspace, and to analyze the currently offered programs from certified organizations for schools in Prague. The basic question of research is: What kind of topics do these preventive programs deal with? The method of this research was based on data collection through document analysis, semi- structured interviews and observation. The results show, that the most developed and complex topics in current practice are cyberbullying and netolism, leading to prevention of potential risky use of social networks and safer use of internet. When the goals of preventive programs are expressed enough specifically and sufficiently and with respect to the child, then it mostly focuses on cognitive aspects of the personality. Based on the research at the end of the thesis, there are formulated recommendations for the implementation of other primary prevention topics in...
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Multi-(K)over-bar (hyper)Nuclei and Kaon Condensation
Gazda, Daniel ; Mareš, Jiří ; Friedman, E. ; Gal, A.
We report on recent relativistic mean-field calculations of multi-(K) over bar nuclei(1,2) which were performed fully and self-consistently across the periodic table. The (K) over bar separation energy B-(K) over bar as well as the nuclear and (K) over bar -meson densities were found to saturate with the number of antikaons in the nuclear medium. Saturation appears robust against a wide range of variations, including the nuclear model used and the type of boson fields mediating the strong interactions. In addition, we have explored properties of kaonic hypernuclei strange systems made of nucleons, hyperons and K- mesons. We observed saturation also in these objects. Since the (K) over bar separation energy B-(K) over bar does not exceed 200 MeV, multi-(K) over bar nuclei lie energetically well above multi-hyperonic nuclei and it is unlikely that kaon condensation could occur in strong-interaction self-bound hadronic matter.
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