Yugra State University
Yugra State University
Kul'kov M.G.,Yugra State University |
Vorob'ev D.S.,Tomsk State University
Journal of Analytical Chemistry | Year: 2017
The possibility of identifying industry-related traces of oil contamination in biogenic sediments is investigated on an example of model oil-contaminated peat samples. It is shown that oil pollution of <1 wt % in biogenic samples cannot be identified using a conventional IR spectrometric procedure. An additional study of organic extracts, isolated in sample preparation, by solid-phase extraction and thin layer chromatography can detect specific oil aromatic hydrocarbons in contaminated samples uncharacteristic for background samples of the same type. © 2017, Pleiades Publishing, Ltd.
Korzhov Y.V.,Yugra State University |
Orlov S.A.,Yugra Nanotechnology Center
Bulletin of the Tomsk Polytechnic University, Geo Assets Engineering | Year: 2016
The relevance of the discussed issue is caused by the practical significance of studying aggregation of asphaltenes in oil film and deter( mining the dimensional parameters of micro( and nanostructures of the deposited components. The previously conducted researches on deposition of asphaltenes from solutions of oil in n(hexane were not associated with the study of such objects as film oil-n-hexane vapors. For this reason, the studies on development of methods for imaging coagulation and deposition of asphaltenes in oil films are of special scientific interest. The main aim of the study is to get the experimental data on aggregation of asphaltenes of film oil on the surface of a solid body in terms of destabilizing effects of n(hexane vapors; to study the morphology and determine the dimensional parameters of the precipitated asphaltenes. The methods used in the study. The authors have applied microvideo for detecting fast processes on the surface of oil films in n-Alkanes vapors. Coagulation and deposition of asphaltenes in oil films were visualized using digital optical microscopy. The morphology and structural parameters of the precipitated asphaltenes were determined by atomic force microscopy (AFM). The results. It was ascertained that in the system oil film-n-hexane vapor, the aggregation of asphaltenes is preceded by local deformation of the film surface in areas of adsorption and penetration of saturated vapor of nhexane into the oil phase. Typical movement of microparticles of asphaltenes in oil film recorded by the digital optical microscopy can be explained by disperse medium circulation. Using the atomic force microscopy method the authors determined the dimensional parameters of the precipitated asphaltene structure. The paper demonstrates the possibility of applying the atomic force microscopy for imaging resins and oils in adsorbed state. The results show that oil asphaltenes deposition on a solid body surface is in nonequilibrium conditions. The research can be used to develop the integrated methodology to study aggregation and coagulation of asphaltenes in oil films using digital optical microscopy and microvideo, and to study the morphology of precipitated asphaltene nanostructures by the atomic force microscopy.
Agency: European Commission | Branch: FP7 | Program: CP-CSA-Infra | Phase: INFRA-2010-1.1.19 | Award Amount: 9.36M | Year: 2011
Environmental change and particularly amplified global climate change are accelerating in the Arctic. These changes already affect local residents and feedback from the Arctics land surface to the climate system, will have global implications. However, climate change and its impacts are variable throughout the wide environmental and land use envelopes of the Arctic. Unfortunately, the Arctic is generally remote, sparsely populated and research and monitoring activities are more restricted in time and space than elsewhere. This limitation comes when there is a rapidly expanding need for knowledge as well as increasing technological opportunities to make data collection in the field and accessibility more efficient. INTERACT is a network under the auspices of SCANNET, a circumarctic network of terrestrial field bases. INTERACT specifically seeks to build capacity for research and monitoring in the European Arctic and beyond. Partnerships will be established between Station Managers and researchers within Joint Research Activities that will develop more efficient networks of sensors to measure changing environmental conditions and make data storage and accessibility more efficient through a single portal. New communities of researchers will be offered access to Arctic terrestrial infrastructures while local stakeholders as well as major international organisations will be involved in interactions with the infrastructures. This will lead to increased public awareness of environmental change and methods to adapt to them, increased access to information for education at all levels, and input to major international research and assessment programmes.The whole consortium will form a coherent and integrated unit working within a concept of a wide environmental and land use envelopes in which local conditions determine the directions and magnitudes of environmental change whereas the balance and synergies of processes integrated across the whole region have global impacts.
Pyatkov S.G.,Yugra State University |
Goncharenko O.V.,Yugra State University
Bulletin of the South Ural State University, Series: Mathematical Modelling, Programming and Computer Software | Year: 2017
The article is devoted to the study of some mathematical models describing heat transfer processes. We examine an inverse problem of recovering a control parameter providing a prescribed temperature distribution at a given point of the spatial domain. The parameter is a lower order coeffficient depending on time in a parabolic equation. This nonlinear problem is reduced to an operator equation whose solvability is established with the help of a priori estimates and the fixed point theorem. Existence and uniqueness theorems of solutions to this problem are stated and proved. Stability estimates are exposed. The main result is the global (in time) existence of solutions under some natural conditions of the data. The proofs rely on the maximum principle. The main functional spaces used are the Sobolev spaces.
Filippova N.V.,Yugra State University
Mikologiya I Fitopatologiya | Year: 2015
Twelve plants were chosen for direct observation of their fungal consorts. Monitoring was done during August-September in 2012 and the whole vegetation season in 2013 on two raised bogs near Khanty- Mansiysk. We revealed about 200 taxa, only part of them are identified at the species level at present. The richest fungal community was recorded on Chamaedaphne calyculata (35 species) and Andromeda polyfolia (39 species). On average about 30 species of fungi was inhabiting on ericoid dwarfshrubs. Two bog herbs revealed relatively large fungal consortia: 24 species were collected from leaves and stems of Eriophorum vaginatum and 20 species from leaves, stems and petioles of Rubus chamaemorus. Other plants have less than 20 fungal species, minimal number of microfungi was recorded on leaves of Menyanthes trifoliata (6 species) and on Drosera anglica (9 species). Fungal consorts of different plants overlap to a small extent, most of microfungi were registered from one substrate. In the paper we describe fungal communities of plants and provide information on taxonomic position, substrate of collection, abundance and nutritional mode in the table.
Kuznetsova S.B.,Yugra State University
Contemporary Problems of Ecology | Year: 2015
The shoot systems and ontomorphogenesis of Atragene sibirica L. have been studied. Morphological and dimensional polyvariance that may take place at the levels of all the functional types of shoots have been described. The high adaptive capacity of this shrubby liana to form shoot systems under different environmental conditions have been revealed. © 2015, Pleiades Publishing, Ltd.
Pankova N.L.,Yugra State University
Russian Journal of Biological Invasions | Year: 2013
Wild boar (Sus scrofa) is a native inhabitant of the southeastern Meshchera lowland. However, as a result of human activity, biotic communities evolved for a long time in the absence this species. When, after a long absence, wild boars reappeared in the Oksky reserve nearly 50 years ago and began to restore its population quickly, the activity of these animals became a new factor of disturbances. Rooting by wild boar can strongly affect wetland and aquatic vegetation, although the effect of wild boar on freshwater ecosystems has seldom been studied. We characterized the use of different types of water bodies by wild boars and assessed long-term and short-term changes in vegetation of water reservoirs under the influence of a wild boar by the example of the Oksky Reserve. Sagittaria sagittifolia was a species that was most attractive for wild boars of any water and wetland vegetation. Vegetation is most intensely disturbed by the animal at floodplain water bodies without significant muddy sediments and at the Pra and Oka rivers. However, the vegetation dynamics begins to be influenced by wild boar activity only in the waters of the high floodplain that are not regularly flooded by spring waters. This influence is expressed as a reduction and thinning of Sagittaria sagittifolia patches, an increase in heterogeneity and patchiness of vegetation on disturbed plots, and formation of naked sites lacking vegetation (in wallows made by the animals). Comparison of our data with initial descriptions of vegetation in ten oxbows of the Pra that were made before wild boar introduction showed an increase in the occurrence of Sagittaria sagittifolia at the level of plant associations and water bodies. This is probably due to the fact that a disturbance of dense thickets of dominant plants of the coastal zone by boars provides favorable conditions for the invasion of species such as Sagittaria sagittifolia. © 2013 Pleiades Publishing, Ltd.
Islamutdinov V.F.,Yugra State University
Life Science Journal | Year: 2014
The paper considers the existing approaches to forecasting development of institutions. It shows drawbacks of the existing approaches and proposes an approach to forecasting the evolution of institutions based on assessment of their impact on the level of transaction costs of economic agents. The possibilities of the proposed approach to explain the phenomena and issues of the domestic innovative environment development and to develop an adequate model of the institution dissemination among economic agents are shown.
Novikov V.P.,Yugra State University
Russian Journal of Ecology | Year: 2015
The position of the southern boundary of reindeer range has been analyzed based on available publications and data of winter censuses over the period from the late 19th century through the early 21st century. Periodic shifts of the boundary to the south and back to the north have been revealed and brought in correlation with the dynamics of reindeer abundance. © 2015, Pleiades Publishing, Ltd.
Filippova N.V.,Yugra State University
Mikologiya I Fitopatologiya | Year: 2014
The paper deals with the communities of bog macromycetes studied by mycocoenological method and random collection method. In total, 20 plots were established in two types of bog phytocoenoses (treed bogs, and sphagnum lawns). Each plot included 30-60 subplots 5 m2 (totally about 4600 m2 was monitored). Analysis of sample-based abundance and incidence data was done by standard mycocoenological procedures. Additional routs and opportunistic collection in the same phytocoenoses in 2012 and 2013 revealed more species and observations. Species list of bog macromycetes contains 15 species recorded in sphagnum lawns and 50 species in treed bogs. Species abundance curves constructed from all sub-plots of each type approach asymptote in lawns and less so in treed bogs. Species density estimated on the basis of abundance curves shows 8 species in lawns and 35 species in treed bogs at 1000 m2. Species with high fidelity to lawns were: Ascocoryne turficola, Arrhenia onisca, Galerina sphagnicola, Hypholoma udum, Psilocybe turficola; high fidelity to treed bogs demonstrated Arrhenia sphagnicola, Cortinarius cf. albovariegatus, C. cf. flexipes, C. cf. flos-paludis, C. huronensis, C. cf. obtusus, C. stillatitius, Galerina allospora, G. sphagnorum, Gymnopus dryophilus, Hebeloma incarnatulum, Mycena concolor, Omphaliaster borealis, Sphagnomphalia brevibasidiata. Most species inhabiting lawns are saprotrophs of sphagnum and plant litter. Half of species from treed bogs form mycorrhiza with Pinus sylvestris, P. sibirica and Betula nana, other are saprotrophs.