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Climate change is one of the biggest challenges of the 21st century and can largely be attributed to human activities, such as burning fossil fuels, according to the 4th Global Evaluation Report of the IPCC (Intergovernmental Panel on Climate Change). International agreements have been made in order to reduce the emission of greenhouse gasses. In Romania, there is a national objective of using energy obtained from renewable sources in a minimum quantum of 10%, by 2020. In order to reach this goal, fuel providers h...

This article is devoted to transport problem, which is one of the main problem of any logging company activity. On fifth all the world?s volume of woods belongs to the Russian Federation. Due to the fact that cutting fund is distributed an unevenly and a part of it is in hard-to-rich places it is use is not effective enough. Approximately 40-70 cubic meter of potential raw material per hectare remains at cutting area. Cutting waste and felling residues great removal is considered to lead to transport costs in Russ...

In Romania, most agricultural farms are subsistence farms and have to face two major problems: lack of capital and impossibility to sell their own production on the market. In the farm production costs, a significant share is represented by the fuel costs (Diesel oil); that is why the authors of this paper evaluated the possibility to lower the costs on the agricultural farms by producing biofuels for the farm own needs. The research work took place at the Banat University of Agricultural Sciences and Veterinary M...

The relationships between vessels and water environment in which they do exploitation tasks are presented in this paper. In conjunction with that fact that vessels are the biggest means of transport, they also have the biggest propulsion units having substantial influence on polluting the natural environment. Therefore an attempt of analysis whether replacing liquid hydrocarbon fuel with alternative fuels reduces degradation of the environment was made. For this purpose an analysis of alternative fuels, mainly bio...

This paper presents a solution for the replacement of conventional fuels with biofuels in order to protect the environment. The proposed biofuel is formed of diesel and a certain amount of animal fats. Biodiesel is similar to diesel fuel but with small differences. The animal fat is the result of the skin processes in the leather industry. In this industry it represents a waste and it is not used. We can consider that the animal fats are a renewable biofuel source. The proposed fuel has the properties of a renewab...

In this paper relationships of vessels and the environment, in which exploitation tasks are carried out, were presented. It was shown how important is rational choice of propulsion unit to construct a vessel which should be provided with proper energy to do the tasks given. Vessels are the biggest means of transport, then they also have a profound influence on natural environment. That is why an attempt of analysis was made whether it is possible to replace hydrocarbon liquid fuels with alternative ones. For this ...

Abstract. The possibility of obtaining biofuel and producing electricity in microbial fuel cells is shown when using the industrial cellulose-destroying Clostridium acetobutylicum strain VKPM-4786 as a bioagent. Substrates for microorganisms in MFC were cellulose, glucose, birch sawdust, starch, sludge-lignin, substandard potatoes, peptone. Calculation of the power of the MFCs under investigation (for 2 days of work) showed that the most effective among them was MFC based on a liquid nutrient medium with the addit...