Plasma source for beryllium spectral line studies in the presence of beryllium dust particles was realised. The guideline during construction was to prevent exposure to formed dust, considering the toxicity of beryllium. Plasma source characterization through determination of optimal working conditions is described. The necessary conditions for Be spectral line appearance and optimal conditions for line shape measurements are found. It is proven experimentally that under these conditions dust appears coincidently with the second current maximum. The electron density measured after discharge current maximum is determined from the peak separation of the hydrogen Balmer beta spectral line, and the electron temperature is determined from the ratios of the relative intensities of Be spectral lines emitted from successive ionized stages of atoms. Maximum values of electron density and temperature are measured to be 9.3 × 10 m and 16 800 K, respectively. Construction details and testing of the BeO discharge tube in comparison with SiO and AlO discharge tubes are also presented in this paper.
Scientific literature abounds in empirical studies in which, using various econometric methods, the determinants of foreign direct investments (FDI) are researched. On the other hand, there are a modest number of studies dealing with pillars of competitiveness or other elements of competitiveness as key determinants of FDI inflows in host countries. The aim of the paper is to point out to the importance of research of these issues by the review of mentioned studies, as well as highlight the advantages of econometric methodology in the field of panel data regression models which are used in these researches, and to come to a conclusion which pillars of competitiveness most often appear as determinants of FDI inflows. Through a detailed overview of selected research studies that, using the same methodology, deal with the researched problem, the authors wanted to set a safe basis for future researches in that area and thereby contribute to the enrichment of scientific literature.
Rezime: Delhaize grupa predstavlja jednog od vodećih inostranih investitora u Srbiji gledano prema iznosu uloženih sredstava, a sudeći po prihodu koji ostvaruje na srpskom tržištu zauzima
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