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Sensoric properties of aromatic and heterocyclic compounds with conjugated bonds

Salyk O., Bednář P., Vala M., Vyňuchal J.

Materials Science Poland

2009

Vol. 27, No. 3

649--658

Dipyridyldiketopyrrolopyrrole and phenylpyridyldiketopyrrolopyrrole were investigated in terms of the effect of acid vapour on their properties, in comparison with diphenyldiketopyrrolopyrrole. Materials were deposited by vacuum evaporation in the form of thin films ca. 100 nm thick. Reversible changes of UV-VIS absorption spectra as well as those of IR absorption spectra when treated with acid vapour were tested. The explanation for the protonation of the ternary nitrogen atom in the pyridyl ring was found. The conductivity measured in a gap electrode arrangement increased by 5 to 6 orders of magnitude. All changes remained stable, unless the sample was regenerated by annealing at 170 °C and the entire process was fully reversible. The compounds exhibit good thermal and chemical stability and are suitable as detector materials in sensors of acids, vapours, and hydrogen.

Safety development analysis in road traffic using a risk-based evaluation.

Vintr Z., Holub R., Vala M.

Zagadnienia Eksploatacji Maszyn

2003

Vol. 38, nr 4

197-204

The paper presents a method using a risk-based evaluation of development of traffic safety, which takes into account not only the causes of accidents but also the effects of accidents simultaneously. It means that the method investigates the risks associated with the accidents. The paper shows that a risk-based evaluation of the road safety can be used as a very useful tool of analysis the trends of the development of safety in road traffic.

Artykuł przedstawia metodę, w której zastosowano ocenę postępu w bezpieczeństwie ruchu, biorącą pod uwagę nie tylko przyczyny wypadków, ale jednocześnie także skutki wypadków. Oznacza to, że metoda bada ryzyko związane z wypadkami. Artykuł pokazuje, że ocena oparta na ryzyku może być bardzo użytecznym narzędziem analizy trendu w postępie bezpieczeństwa w ruchu drogowym.