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2 Polish Journal of Applied Chemistry

2 2000

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Role of coal structure in gas-dynamic phenomena

Adashkevich S., Stelmakh V., Strigutsky V., Partyka J., Węgierek P.

Polish Journal of Applied Chemistry

2000

Vol. 44, nr 2-3

139-144

The processes of coal metamorphism and the role of its structure in dangerous gas-dynamic phenomena are considered. The coal structural transformation model in metamorphism processes has been suggested. It has been cleared, that a maximal dispersion of physicochemical properties is also characteristic for a substance critical state with the maximal probability of sudden ejection. A way to diagnose the sudden ejection probability has been suggested. The application of this diagnosing is illustrated on an average metamorphism coal using the electron paramagnetic resonance (EPR) method.

Oxygen influence on EPR spectra of carbon materials

Stelmakh V., Stryhutski L., Shpilevsky E., Żukowski P., Karwat C.

Polish Journal of Applied Chemistry

2000

Vol. 44, nr 4

227-234

A model of the effects of paramagnetic oxygen molecules as centres of short relaxation times on paramagnetic carbon centres has been developed. A "Relay-race mechanism" concept has been proposed within which changes are considered from the viewpoint of the character of an interaction between carbon centres induced by oxygen molecules. The model accounts for literature data concerning on anomalous decrease of recorded intensity during oxygen molecule input. A possibility of the formation of a superlorentz line form, characterised by shallower slope of the wings as compared to the lorentz line has been demonstrated. Quantitative parameters for the line form analysis have been introduced.