This research analyzed the degree of utilization of the agricultural biomass for energy purposes (combustion), in order to indicate the reasons that limit its use. The biomass potential was studied by means of the methodology of the biomass potential, whereas the factors suggesting a low degree of biomass utilization were identified by means of factor analysis. The research results reveal that there is an enormous potential of the unused agricultural biomass. This dissertation research significantly contributes to the establishment of a genuine mathematical model based on multiple linear regression. The solution obtained by this analysis, in both a mathematical and a scientific manner, conveys the primary reasons for an insufficient utilization of the biomass for energy purposes. Moreover, the paper suggests the measures to be applied for a more substantial use of this renewable source of energy and presents the expected benefits to be gained.

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Although the potential of solar energy in the Republic of Serbia is up to 30% higher than in the countries of the European Union that lead to the implementation of these technologies, the Republic of Serbia is ranked among the countries with the lowest production in the region with the production of 10 MV solar PV capacities. The aim of the paper was to present the current balanced capacities, related to solar PV energy, in the Republic of Serbia and countries in the region. In order to present better the material and conclude why the results in the Republic of Serbia are not better, in the paper are analyzes the possibilities for installing such capacities as well as the barriers that need to be eliminated.

Fuel consumption of heavy duty vehicles is caused by actual vehicle resistances acting during the vehicle motion. This paper deals with possibilities to reduce the vehicle aerodynamic resistance, air drag coefficient. This resistance effects the vehicle fuel consumption by higher vehicle velocities at most. There are evaluated actual values of vehicle air drag coefficient, possible devices reducing the air drag and the influence of chosen aerodynamic devices on the drag reduction and fuel consumption reduction.