The establishment of landscape parks is an ever more frequently applied form of protection of natural resources. It is important for this form of protection not only to enable preservation and improvement of the state of natural environment but also to teach co-operation between man and nature in everyday life. The author identifies conflicts resulting from the establishment of a landscape park, while pointing to the possibilities of resolving such conflicts, or at least remedying their negative effects. She considers various types of conflicts: environmental/economic, social/environmental, and social/economic.
This paper presents a mathematical model of piston-rings-cylinder sealing (TPC) of a combustion engine. The developed model is an itegrated model of gas flow through gaps in TPC unit , displacements and twisting motions of piston rings in ring grooves as well as generation of oil film between ring face surfaces and cylinder liner. Thermal deformations and wear of TPC unit elements as well as heat exchange between flowing gas and surrounding walls , were taken into account in the model. The paper contains descriptions of: assumptions used for developing the model , the model itself, its numerical solution as well as its computer application for carrying out simulation tests