I. I. Bogdanov

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Two-phase flow in fractured porous media is investigated by means of a direct and complete numerical solution of the generalized Darcy equations in a three-dimensional discrete fracture description. The numerical model applies to arbitrary fracture network geometry, and to arbitrary distributions of permeabilities in the porous matrix and in the fractures.(More)
A general three-dimensional numerical model for single phase, slightly compressible flow through fractured porous media is described. It is based on a discrete fracture representation. Three sets of applications are presented. In the first one, pressure drawdown well tests in closed oil reservoirs are simulated for complex model situations where the well(More)
The permeability of geological formations which contain fractures with a power-law size distribution is addressed numerically by solving the coupled Darcy equations in the fractures and in the surrounding porous medium. Two reduced parameters are introduced which allow for a unified description over a very wide range of the fracture characteristics,(More)
The isolation of viruses of tick-borne encephalitis, West Nile fever, and Omsk hemorrhagic fever from arthropods of nests of colonial birds (rook, sand martin, tree sparrow, Laridae) in different zones of West Siberia (from tundra to steppe) has been analyzed. The role of gamasid mites, hematophages and saprophages, characteristic inhabitants of nests of(More)
The authors have developed a typological classification of tick-borne rickettsiosis foci by the type of the main carrier by identifying 6 major types out of which the Dermacentor steppe and partially wooded steppe foci are most extensive and epidemiologically significant. They provide a spatial and functional characterization of the foci of this infection(More)
Forty-six chiropteran specimens from seven species have been captured on the territory of Southern Siberia. From them, 676 ectoparasites of 16 species (gamasid mites and insects) were collected. The bat fly Basilia mongolensis mongolensis Theodor, 1966 was found in Russia for the first time. The gamasid mites Spinturnix maedai Uchikawa et Wada, 1979 and(More)
A generalized analysis of data on a flea fauna, range of their hosts in various natural zones, and features of parasite-host relationships between fleas and small mammals obtained in the Omsk province during long term researches in 1963-1997 is given. 35 flea species are recorded. The most mass species both on animals and in their nest is Ctenophthalmus(More)
Faunistic study of horseflies was performed during 2007-2009 in forest zone of Omsk region; 6206 horsefly specimens from 27 species were collected. Taking into consideration the collections of Tabanidae made by Alifanov and Rastegaeva during the 1950s, 30 species of horseflies are present in the territory under consideration. The species of Tabanidae(More)
The organism of arthropods and warm-blooded vertebrates as a habitat of a virus determines the population genetic structure of tick-borne encephalitis (TBE) virus strains. The pattern of hybridization by variable zones of TBE genomes gradually changes in the course of intracerebral passages of the virus in newborn white mice. During intracelomal passages in(More)