Acoustic emission generated in systems: coal - carbon dioxide and coal - methane

Authors: Z. Majewska, J. Ziętek

The relation between swelling of coal and the sorption of fluids flowing through it

Author: M. Sławomirski

Some aspects of extreme control in coal concentrates production

Authors: S. Cierpisz, J. Pielot

The influence of environmental salinity on the cement plug mechanical strength in a function of time

Author: J. Wilk

Computer simulation of ventilation start and stoppage

Author: J. Krawczyk

Energy - security of countries

Authors: Z. Kolenda, J. Siemek