Poddano analizie kształtowanie się kosztów średnich budowy autostrad w Europie, z odcinkami tras prowadzonych w terenach górzystych i w tunelach. Korzystając z zaproponowanego sposobu przeliczeń porównano koszty budowy dróg w tunelach, w Słowenii i w Polsce. Z cenami opracowanego kosztorysu autorskiego dla odcinka drogi ekspresowej S7 Naprawa – Skomielna Biała wraz z tunelem, skonfrontowano wartości poszczególnych robót zaoferowane przez 6 zaproszonych do przetargu ograniczonego wykonawców. Wnioski ukierunkowano na ocenę poziomu kosztów realizacji dróg w Polsce w kontekście nakładów występujących w krajach Unii Europejskiej.
EN
We analyse the variability of the costs of the construction of motorways in Europe. Attention is paid to the formation of the cost of motorway sections run in mountainous areas and in tunnels. A method for calculations is proposed and the costs of building roads with tunnels in Slovenia and in Poland are compared. The paper presents the developed authorial cost estimate for the excavation of the tunnel in the stretch of the expressway S7 Naprawa - Skomielna Biała and examines the value of individual works presented by the 6 bidders who participated in a restricted tender. Conclusions are focused on the assessment of the cost level of road construction in Poland in the context of the expenditures incurred in the European countries.
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Microwave saturation of multi-component EPR spectra of oxidized lignite Mequinenza (Spain) with a carbon content of 65.1 wt % and with a high sulphur content of 10.3 wt % was studied. The coal was oxidized with nitric acid (NHO3), peroxyacetic acid (PAA), and in O2/Na2CO3 system. Three different groups of paramagnetic centres exist in the coal samples analyzed. The EPR spectrum of the demineralised coal was a superposition of broad Gauss (ΔB pp = 0.75 mT), broad Lorentz 1 (ΔB pp = 0.42 mT) and narrow Lorentz 3 lines (ΔB pp = 0.08 mT). The three EPR components with linewidths: 0.58–0.77 mT (Gauss line), 0.30–0.39 mT (Lorentz 1 line) and 0.05–0.06 mT (Lorentz 3 line) were recorded for the oxidized coal. The g-values were obtained for the samples studied in the ranges 2.0043–2.0046 (Gauss lines), 2.0035–2.0038 (Lorentz 1 lines) and 2.0032–2.0034 (Lorentz 3 lines). The broad Gauss and Lorentz 1 lines saturate at low microwave powers. The narrow Lorentz 3 lines of demineralised coal were not saturated at microwave power from the range considered. After the coal oxidation with HNO3, PAA and in O2/Na2CO3 system, the microwave saturation of the narrow Lorentz 3 lines was also observed, which indicated a degradation of the multi-ring aromatic structures upon oxidation. [...]
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