Time filter

Source Type

Ilyasov R.A.,Russian Academy of Sciences | Kutuev I.A.,Russian Academy of Sciences | Petukhov A.V.,Perm State Pedagogical University | Poskryakov A.V.,Russian Academy of Sciences | Nikolenko A.G.,Russian Academy of Sciences
Journal of Apicultural Science | Year: 2011

A mitochondrial DNA region covering 5'-end of the gene of the second subunit NADH dehydrogenase (ND2), was PCR amplifi ed in Dark European Honeybees Apis mellifera mellifera from the Urals (Russia) region and in the presumed Apis mellifera macedonica from the Ukraine. Phylogenetic analysis of sequenced DNA samples with GenBank (http://www.ncbi.nlm.nih.gov) data showed the existence of four evolutionary branches where the Ural honeybees were grouped with European A. m. mellifera, and Ukrainian honeybees with European A. m. macedonica. These results suggest the genetic relationship of the Russian Urals and the European populations of A. m. mellifera. These data have allowed us to put forward the hypothesis that the subspecies A. m. mellifera, is a unique specimen of evolutionary branch M. Source

Karmanov V.N.,Russian Academy of Sciences | Zaretskaya N.E.,Russian Academy of Sciences | Lychagina E.L.,Perm State Pedagogical University
Radiocarbon | Year: 2012

By analyzing archaeological evidence and radiocarbon dates, we studied the Neolithization of Far Northeast Europe (Russian Perm' region, Komi Republic, and Nenets autonomous district). Our study shows that this process in the eastern European forest zone was rather ambiguous. Taking into account the periodicity of settling and short duration of residence here, the term "Neolithization" in its traditional sense cannot be applied to some territories in this region. For instance, the emergence of ceramics-the most important feature of Neolithization here-did not affect considerably the way of life of the ancient population, which continued the traditions of the Mesolithic hunter-gatherers well into the Early Neolithic. Such attributes as heat treatment of clay paste and siliceous rocks for changing physical features of natural materials, bifacial knapping, and construction of subterranean dwellings represent the archaeological evidence of Neolithization in the region. © 2012 by the Arizona Board of Regents on behalf of the University of Arizona. Source

Eremin E.A.,Perm State Pedagogical University
8th IEEE International Conference on Application of Information and Communication Technologies, AICT 2014 - Conference Proceedings | Year: 2014

Paper proposes new ideas about assessment of conceptual knowledge, obtained after digestion of a learning course. It offers original way to evaluate an educational success, which is based on the analysis of concepts' interrelations: students who mastered a material better, must demonstrate more linked structure of knowledge. Formal assessment procedure was developed; its experimental assay showed the existence of accordance between the proposed quantitative gauge and conventional teacher's marks. So considered method may be useful for final control to verify how student has digested a large complete portion of content during e-learning process. Source

Bratsun D.A.,Perm State Pedagogical University | De Wit A.,Free University of Colombia
Chemical Engineering Science | Year: 2011

Buoyancy-driven convection can be induced by concentration and temperature gradients near the interface between two immiscible fluids filling a vertical Hele-Shaw cell, each of them containing a reactant of an exothermic A+B → C reaction taking place in the bulk of the lower layer. A chemo-hydrodynamical pattern appears then due to the combined action of Rayleigh-Taylor, diffusive layer convection and Rayleigh-Bénard instabilities occurring either below or above the interface. The mathematical model we develop to describe such dynamics consists in a set of reaction-diffusion-advection equations ruling the evolution of concentrations and temperature coupled to Navier-Stokes equation, written in a Hele-Shaw approximation. We perform numerical simulations of the non-linear system and study the influence on pattern formation of changes in the Damköhler number of the problem and in the ratio of initial reactant concentrations. © 2011 Elsevier Ltd. Source

Kozlov N.,Perm State Pedagogical University | Salnikova A.,Perm State Pedagogical University | Subbotin S.,Perm State Pedagogical University
Proceedings of the International Astronautical Congress, IAC | Year: 2012

The wave processes on the surfaces of the tangential discontinuity of velocity are studied in the rotating systems. The discontinuity on the boundary of the Taylor-Proudman column is considered, the latter being formed by a light spherical body rotating with the velocity different from that of the medium. The body is free, and under the action of centrifugal force it is situated near the rotation axis of a liquid-filled cavity. In the basis of generation of the light body differential rotation is the vibrational mechanism. The body motion is excited as a result of its circular oscillations in the cavity frame of reference. The oscillations, in their turn, are induced either by the cavity vibrations in the direction perpendicular to the rotation axis, or by an external static force field. In the latter case, at the cavity rotation around the horizontal axis the gravity field is rotating in the cavity frame. Depending on the vibrational action frequency the excitation of both outstripping and lagging body rotation is possible. The development of the wave instability on the liquid column boundary (Taylor-Proudman column) is found at a certain intensity of the sphere differential rotation. It manifests itself in the azimuthal wave excitation, the crests of which are elongated parallel to the rotation axis. The study of the phase velocity, the wave number and the wave instability threshold is carried. The waves of the similar kind have been earlier found on the interface of two immiscible liquids of different density at rotation and simultaneous action of an external force. In the basis of differential rotation of the light liquid column is also the vibrational mechanism of the average shear stress generation on the media interface. The further study of this phenomenon is led. The comparative analysis is done of the results obtained in the experiments with the solid in liquid and the results obtained for the rotating two-liquid system. The focus is made upon the case of gravitational excitation. ©(2012) by the International Astronautieal Federation. Source

Discover hidden collaborations