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Pnącza na ekranach – ciekawostka czy konieczność?

Marczyński S.

Magazyn Autostrady

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2010

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Nr 8-9

70--77

PL

Przybywa tras szybkiego ruchu i autostrad. Poruszające się po nich z dużą prędkością pojazdy mechaniczne wytwarzają dużo hałasu i zanieczyszczają powietrze szkodliwymi, silnie rakotwórczymi związkami chemicznymi i pyłami. Drogi szybkiego ruchu przechodzą przez tereny silnie zaludnione, znacznie pogarszając warunki bytowania człowieka, wpływając negatywnie na psychikę ludzi, zmniejszając ich sprawność, utrudniając im koncentrację i wypoczynek oraz stwarzając zagrożenie dla zdrowia. By temu przeciwdziałać, wznoszone są ekrany akustyczne; w zależności od konstrukcji, wysokości i nachylenia mają one różne zdolności tłumienia hałasu, wiele z nich odbija fale dźwiękowe, przenosząc je na duże odległości.

EN

The number of motorways and expressways is growing and simultaneously the vehicles which move fast produce a lot of noise and pollution. The expressways go through the highly-urbanized areas by which the living conditions of a human being are worsened considerably – the have detrimental infl uence on human’s psyche, diminish concentration and rest thus being harmful to their health. To prevent it, acoustic barriers are installed, many of which reflect sound waves, carrying them away far away.

2

Magnetic ordering processes in manganese(II) di(hydrogen malonate) dihydrate complex studied by ESR spectroscopy

Marczyński S., Typek J., Grech E., Kołodziej B.

Materials Science Poland

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2006

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Vol. 24, No. 4

1139--1144

EN

A new manganese complex of malonic acid CH2(COOH) 2źMnCO3źH2O was synthesized. Temperature dependence of the electron spin resonance (ESR) spectrum of Mn(II) was investigated in the 4.2-295 K. temperature range. The obtained ESR spectra were successfully fitted by using a Lorentzian-shape function. The fitting revealed existence of about 2% of a spurious phase of the manganese(II) complex. Strong magnetic interactions have been observed in the investigated temperature range with expected magnetic phase transition at TN approximately equals 2.5 K. The integrated intensity, linewidth and resonance field of the ESR spectrum have shown that the spin dynamical fluctuations essentially influence the magnetic system. An anomalous behaviour of the ESR resonance field parameter has been observed below 100 K. and with decreasing temperature the resonance field shifted to higher magnetic fields.

3

Electron spin resonance study of copper(II) hydrogenmalonate dihydrate complex

Marczyński S., Typek J., Guskos N., Grech E., Kołodziej B.

Materials Science Poland

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2006

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Vol. 24, No. 4

1077--1085

EN

Copper(II) hydrogenmalonate dihydrate complex has been studied by using the electron spin resonance (ESR) method. Numerically deconvoluted ESR spectra of Cu(II) ions have been investigated at 4.2-295 K temperature range. The powder ESR spectrum has been described by three g-factors and additionally 1.5% of the existing spurious phases of a copper(II) complex has been revealed. The temperature dependence of the integrated ESR intensity has shown a Curic-Weiss type behaviour, consisting of two terms with different Curie-Weiss temperatures. The observed ferromagnetic interactions suggest the presence of two different paramagnetic species. It is proposed that the [Cu(H2O) 4][Cu(mal)2(H2O)2] copper(II) dimer complex is responsible for the low-temperature (T less than or equal 50 K) behaviour of the investigated sample.