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Twenty exuviae of Coenagrion puella were marked and observed for three weeks in 2005. The number of marked exuviae rapidly declined and after 23 days there were only 30% of exuviae left; these were so weather-worn that it was impossible to identify them. To collect 50% of the exuviae it would be necessary to visit a locality 10 days after emergence.
This article deals with total waste separation in the frame of a concrete region in Slovakia. The goal of the contribution is to use logistics, modelling, and simulation for the needs of total waste separation and liquidation to the way raw material and usable sources for new use in practice. Results of the simulation show that by total separation and waste recycling in the frame of the concrete analysed region it is possible to produce during the whole year approximately 390,000 m³ of biogas, and it is possible to obtain approximately €9.3 million per year, which can be used for developing complex recycling systems in the region.
This article deals with research on the impact of waste incineration processes on the environment within a particular region by means of computer simulation and logistics principles. The area of interest for this case study considers the aspects of the practical application of using the above methods and principles in order to reduce the environmental impacts of the waste incineration process in the Slovak Republic. At the initial stage of simulation model design, it is necessary to establish a formalized scheme, which is the basis for creating the actual simulation model. Then in the next stage the simulation model is created by combining building blocks within the given simulation software. The simulation results show that incineration during a one-year period produces about 15,266 tons of plastic and electrical components, and will release about 590,000 GJ of energy and about 199,000 tons of steam and 287 tons of other emissions with only 3 milligrams of dioxins. The computer simulation method is used to analyse, and subsequently adjust and improve the waste incineration process in order to achieve the desired parameter values – specifically the amount of heat produced, and the amount of generated steam and air pollutants.
Our paper deals with the solution of ecological flood-type accidents and the mitigation of their impacts during their occurrence. The main task is to defeat an accident on a watercourse as soon as possible, efficiently and economically, by arranging a floating boom. Closer specifications of the paper involve the technical use of floating booms and the calculation of the resistance force, which influences the application of a floating boom at a given current velocity. The calculations show that flow and size of a river flow has a direct effect on the size of the force that impinges on a barrage. The maximum river flows are in the time of January and February. The smallest river has flow of about 2.346 m³ s⁻¹ in this time, and the biggest river has a flow of 28.88 m³ s⁻¹ in defined time.
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