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Gas flow through porous media is a physical phenomenon commonly occurring in natural environment and in many industrial applications. This phenomenon is most often connect with filtration process and migration of gases through different porous structures, mainly rock media. In these medium there occur free spaces of different shapes, in which flow of gas is possible. These spaces create pores (for which longitudinal dimension and transverse dimensions are similar) and gaps (for which transverse dimension is consid...

One of the main factors determining economic and social development of particular countries is availability of cheap energy source. In a case of European countries, this availability has also important influence on the integration process. Amount of produced energy in given country tells about the level of its civilizing development. Also so-called energy independence that most countries are aimed and which guarantees political independence is strictly related to this problem. It can be assumed, that energy is one...

The production of electricity and heat is inextricably linked to the emission of gases, dust and other substances harmful to the environment. The size of this issue depends on many factors. The most important ones are: the type of fuel used in the production of energy, the type and age of generating installations, the technology used and the type and effectiveness of purification systems. The basic problem of power industry is the need to generate the right amount of energy needed for economic development, while a...