National Research Tomsk Polytechnic University
Author list of organization
List of articles written by the authors of the organization
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06.00.00 Agricultural sciences
Description
The increasing consumption of forest resources causes a greater anthropogenic impact on forest ecosystems and leads to a negative impact on both biodiversity and the environment as a whole. In this article, the sustainability of forest phytocenosises of southeast of Western Siberia is assessed using the example of Tomsk region. The analysis of the status and dynamics of the forests of Tomsk region has been assessed. The main factors negatively affecting the biodiversity of forests of Tomsk region were analyzed. The forests cover extensive areas; therefore, the studies were carried out based on the data from the State Forestry Register of the Russian Federation for the period from 2008 to 2015. According to the results of the study, the sustainability of forest phytocenosises has increased significantly in recent years, which can be explained by its strengthened ability to maintain the current state under the influence of external factors. This work considers such causes of damage and death of forest plantations as pests, forest diseases, unfavorable soil and climate impacts, forest fires, as these are the main and most massive phenomena that cause the greatest damage to forest. It is possible to see the dynamics of damage and death of forest plantations on the figures presented in the article
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MAGNETIC PARTICLES` FORMATION IN CONDITIONS OF THE LOW-TEMPERATURE PLASMA AND MAGNETIC FIELD
01.00.00 Physical-mathematical sciences
Description
Chemical processes are often connected with use or formation of condensed dispersed phase (CDP). Dispersed particles can change mobility of charges, as well as other parameters of the low-temperature plasma. The aim of this work is to study the effect of magnetic field on the processes of dispersed particles formation in argon-oxygen plasma containing iron and carbon atoms at atmospheric pressure. The equilibrium composition of iron and carbon atoms containing mixture simulated at temperatures of 1000-5000K for optimization of the plasma-forming gas composition. It is shown that in case of oxygen excess, the CDP particles contain only iron oxides. The literature data about the phase transition processes in a low-temperature plasma, as well as the data about the processes with participation of ferromagnetic particles in a constant magnetic field analyzed. The results of investigations of the dispersed particles forming in argon-oxygen plasma of arc discharge in the presence and in the absence of the magnetic field are shown. The formed disperse phase was deposited on the substrates and studied by the electron microscopy and X-ray methods. It was found that with the lack of oxygen the size of the iron-oxide particles created in the arc discharge containing iron and carbon is affected by magnetic field: in a magnetic field of 10 mT the particles are larger than in its absence
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