Distribution of the siberian flying squirrel (Pteromys Volans L.) in taiga isthmuses between Baltic and White Sea regions [Voverės skraiduoles (Pteromys volans L.) paplitimas taigos sasmaukose tarp Baltijos ir Baltosios juru]
Kurhinen J.,Finnish Game And Fisheries Research Institute |
Kulebyakina E.,Lesnaja St. 5 8 |
Zadiraka E.,Karelian State Pedagogical University |
Mamontov V.,Russian Academy of Sciences |
And 2 more authors.
Acta Zoologica Lituanica | Year: 2011
We focused our attention on three narrow isthmuses between the White and the Baltic Seas, which form important connections for the elements of northern taiga ecosystems, such as the Siberian flying squirrel. The method that we employed is based on the search of flying squirrel's excrements on randomly selected 9 ha plots (more than 11700 plots studied in Russia and in Finland). Relative abundances of the flying squirrel in Russian Karelia and the Karelian Isthmus seem to be slightly higher than in Finland. The border of the flying squirrel's range in the North-West could be delineated from the national park Kalevalski, across the Segezha region to the southern part of the White Sea, and further to the east. We suppose that the connection between flying squirrel populations of Scandinavia and Russia is mainly implemented through a narrow 'middle-taiga corridor', i.e. the isthmus between Ladoga and Onega Lakes, and only partly by the isthmus between Lake Onega and the White Sea.
Andreev V.P.,Petrozavodsk State University |
Vapirov V.V.,Petrozavodsk State University |
Nizhnik Ya.P.,Petrozavodsk State University |
Tunina S.G.,Karelian State Pedagogical University |
Sobolev P.S.,Karelian State Pedagogical University
Russian Journal of Organic Chemistry | Year: 2010
Thermodynamic parameters of complexation of tetraphenylporphyrinatozinc(II) with pyridines in chloroform at 273-313 K are linearly related to the corresponding shifts of their absorption maxima in the electronic spectra, logarithms of the stability constants of the complexes, pK a values of the ligands in water, and Hammett substituent constants σ provided that steric factors are absent. Linear correlations also exist between thermodynamic and kinetic parameters of some nucleophilic substitution reactions and complex formation of tetraphenylporphyrinatozinc(II) with pyridines and pyridine N-oxides. © 2010 Pleiades Publishing, Ltd.
Yakovleva N.M.,Karelian State Pedagogical University |
Yakovlev A.N.,Petrozavodsk State University |
Gafiyatullin M.M.,Karelian State Pedagogical University |
Denisov A.I.,Karelian State Pedagogical University
Inorganic Materials | Year: 2010
A method based on the computer analysis of electron microscopic images of the surface of porous anodic aluminas is described for deriving quantitative information about the mutual arrangement of cells and pores (mesoscopic structure). The developed package of programs is used to calculate dimensional parameters of a cellular-porous structure, the size distribution of the image objects, and the morphological functions of the radial distribution of cells/pores, which are analogs of the function of the radial distribution of atoms characterizing the short-and medium-range orders of atoms in amorphous materials. A quantitative analysis is performed for the first time using the method of pair functions, which was used earlier for identification of the atomic structure in amorphous films. The developed package of Spot Calculator and MFRD programs for processing electron microscopic images of the surface can be used to study the mesoscopic structure of not only porous aluminas but also any materials if characteristic features can be distinguished on their surface. © 2010 Pleiades Publishing, Ltd.
Sasin A.V.,Karelian State Pedagogical University |
Wagner S.D.,Karelian State Pedagogical University |
Platonov A.A.,Karelian State Pedagogical University
Technical Physics | Year: 2010
A dc magnetron discharge in neon is studied at different polarities of the electrode system. It is found that the electron energy distribution function is composed of three groups of electrons: fast electrons accelerated by the strong field of a cathode sheath, slow electrons confined in a potential well due to the space-charge field, and intermediate-energy electrons. It is shown that the energy distribution of the confined electrons is a Maxwell-Boltzmann distribution function, whereas the energy distribution of the intermediate electrons is typical of electron diffusion at a constant total energy. The measured values of the cathode sheath thickness depend on the source polarity. © 2010 Pleiades Publishing, Ltd.