In this paper, it was determined that all of the three-dimensional principal stresses increase with depth and that both the maximum and the minimum stresses tend to be aligned in the horizontal orientation. The numerical simulation model was built using the software FLAC<Superscript>3D</Superscript> to simulate two times,...</superscript>

Gas drainage not only ensures safety in coal mine but also produces clean energy and reduces emission of greenhouse gases. However, a good method to evaluate the efficiency of gas drainage is still absent. In this study, we firstly propose a definition of gas drainage efficiency which is defined...

For the hypothetical deposit with parameters similar to KWB “Konin” S.A. conditions; lignite prices and proposed divisions are calculated and results were discussed under the angle of the fairness (equity) of the division and the possibility of their approval by both sides. A sensitivity...

Different structures of lignite mines and power stations, which have appeared on the Polish market as a result of its transformation and the privatisation, were discussed. The attention is focused on the fact that the practice is overtaking the theory because there is lack of models of...

For methods of the profit division in the bilateral monopoly of the mine and the power station sug-gested in the first part of this paper the formulae for lignite price and shares in the joint profit of the mine and the power station are calculated. The proposed profit division contain: the...

The control over producing of goods and supplying of services is a difficult task even in the stable economical situation. The information about intrinsic conditions of a system, her environment and directed tasks realization is necessary for assessment of the situation and for making a correct...

This paper reviews theoretical issues surrounding transport safety modeling and the implications for road safety policy. The behavioral mechanisms that affect transport safety are typically not considered in safety modeling. These issues are discussed in the context of trade-offs between...

Logistics is not only a fundamental component of firms? strategies and a vehicle for globalization, it is also becoming an issue for regional development and planning. Logistics represents a whole system of spatial and temporal interactions. Its territorial implications are significant. The...

The main objective of this paper is to study existing methodological frameworks on group modelling projects using system dynamics. Such projects are more and more applied in organizations in order to support their strategic decisions. In this research, key frameworks were first identified and...

This study proposes a Continuous Auditing Assistance System (CAAS), which can assist auditors to assess potential weaknesses in the information systems. Auditors can perform auditing tasks independently, give feedback immediately on the extraordinariness and reach the objectives of continuous...