The paper presents selected isotropic and anisotropic mathematical models to calculate the distribution of solar radiation on the photovoltaic module plane with any spatial orientation. A comparison of solar radiation models for Poland is based on measured data and received from the Institute of...

The paper deals with practical aspects on how to point out in the economic units accounting the operations generated by exploitation, processing, storage and marketing of timber. In this approach, we have initially presented the legal provisions in force since 1 October 2008 in the exploitation...