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Search Results: 1 - 10 of 130560 matches for " Evelina V. Kuzmina "
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Using of case – means for realization of competence – based approach to the preparation of bachelor of applied computer science and business – informatics
Evelina V. Kuzmina,Vera S. Sidorenko
European Researcher , 2011,
Abstract: Comparative analysis of case – means for effective formation of professional competence of Bachelor of Applied Computer Science and Business – Informatics.
Influence of the Delay and Dispersion in Mechanics  [PDF]
Evelina V. Prozorova
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.516177
Abstract: The aim of this work is to clarify the new mathematical model describing the mechanics of continuous media and rarefied gas. The present study is associated with the formulation of conservation laws as conditions of equilibrium of angular momentums, while usually formulated in terms of balance of force. The equations for gas are found from the modified Boltzmann equation and the phenomenological theory. For a rigid body, the equations used the phenomenological theory, but changed their interpretation. We elucidate the contribution of cross-effects in the conservation laws of continuum mechanics, including the self-diffusion, thermal diffusion, etc., which indicated S. Wallander. The paradox of Hilbert in the solution of the Boltzmann equation by the Chapman-Enskog method was resolved. Refined model of the boundary conditions for rarefied gas flows and transient flow were near the moving surfaces. We establish conditions for the existence of the A. N. Kolmogorov inertial range on the basis of the proposed theory. Based on the theory, derivation of the Prandtl formula for boundary layer was received. Delay in mechanics plays an important role on commensurability of relaxation times and lateness. New accounting delay option is proposed to consider the difference between the time derivative as a limit and end values of the mean free path in a rarefied gas. The role of individual time delay for each particle velocity and the average time is debated. The Boltzmann equation is written with an additional term. This situation is typical for discrete medium. The transition from discrete to continuous environment is a key issue mechanics. Summary records of all effects lead to a cumbersome system of equations and therefore require the selection of main effects in a particular situation. The role of the time has similar problems in quantum mechanics. Some examples are suggested.
FEATURES OF FORMATION OF EMBRYONAL BUD FRUITING OF WINTERING EYES AT DIFFERENT ORIGIN VARIETIES OF GRAPE IN THE CONDITIONS OF TAMAN Особенности формирования эмбриональной плодоносности почек зимующих глазков у сортов винограда разного происхождения в условиях Тамани
Matuzok N. V.,Kuzmina T. I.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: This article surveys the results of studies of the process of differentiation of inflorescences of wintering buds of grapes of different varieties in the period of relative dormancy in the conditions of Taman
Condensation energy in Eliashberg theory -- from weak to strong coupling
Evelina Tsoncheva,Andrey V. Chubukov
Physics , 2005, DOI: 10.1103/PhysRevB.71.184513
Abstract: We consider two issues related to the condensation energy in superconductors described by the Eliashberg theory for various forms of the pairing interaction, associated either with phonon or electronic mechanisms of superconductivity. First, we derive a leading correction to the BCS formula for the condensation energy to first order in the coupling $\lambda$. Second, we show that at a given $\lambda$, the value of the condensation energy strongly depends on the functional form of the effective pairing interaction $\Gamma (\omega)$.
The Influence of Ceric Oxide on Phase Composition and Activity of Iron Oxide Catalysts  [PDF]
Aleksandr A. Lamberov, Ekaterina V. Dementyeva, Dmitriy I. Vavilov, Olga V. Kuzmina, Rinat R. Gilmullin, Ekaterina A. Pavlova
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.21004
Abstract: The process of dehydrogenation of methyl butenes to isoprene is conducted in the presence of iron oxide catalysts whose composition may include oxides of alkaline metals, alkaline earth metals, and transition metals. Catalysts of latest generation can also contain oxides of rare earth elements, particularly cerium oxide. However there is no any common opinion concerning its effect on catalytic properties of iron oxide catalysts. It is well known that ceric oxide has a positive effect on the quantity and stability of active centers and can play a critical role in a redox cycle of the dehydrogenation process. By means of differential thermal analysis, dispersion analysis and X-ray phase analysis, it was found in present study that introducing of ceric oxide promotes the decrease in hematite crystallite sizes. At the same time, it prevents potassium polyferrites formation, with the equilibrium of topochemical reaction between ferric oxide and po tassium carbonates moving predominantly to the formation of intermediate products–monoferrite systems, having greater catalytic activity. The increase in potassium monoferrite content results in dispersion of particles in the Fe2O3-K2CO3-СеО2 system that is accompanied by modification of texture characteristics. For this catalyst composition, the optimum concentration of ceric oxide (8.7 wt.%), leading to the formation of a certain ratio of mono- and polyferrite phases, was found. If more than 8.7 wt.% of СеО2 is introduced, the modification of texture characteristics of catalyst samples takes place, that negatively affects their selectivity.
Influence of proton shell closure on production of new superheavy nuclei
Kuzmina A. N.,Adamian G. G.,Antonenko N. V.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123817004
Abstract: The shell structure of nuclei with Z > 104 is studied with modified two-center shell model. Using macroscopic-microscopic approach, the mass excesses and Qα-values are calculated and compared with available experimental data. Our calculations reveal quite strong shell effects at Z = 120-126 as well as at N = 184. If our predictions for the heaviest nuclei are correct then one can expect the production of evaporation residues with Z ~ 120 in the reactions 50Ti+249Cf and 54Cr+248Cm with the cross sections 23 and 10 fb, respectively. Nuclei with Z = 120 and N = 178 – 182 are expected to have Qα about 11 MeV and life-time of 0.17 ms – 0.16 s.
Full Descripion of ring varieties whose finite rings are uniquely determined by their zero-divisor graphs
Yu. N. Maltsev,E. V. Zhuravlev,A. S. Kuzmina
Mathematics , 2012,
Abstract: The zero-divisor graph $\Gamma(R)$ of an associative ring $R$ is the graph whose vertices are all nonzero zero-divisors (one-sided and two-sided) of $R$, and two distinct vertices $x$ and $y$ are joined by an edge iff either $xy=0$ or $yx=0$. In the present paper, we give a full description of ring varieties where every finite ring is uniquely determined by its zero-divisor graph.
Signatures of non-monotonic d-wave gap in electron-doped cuprates
Ilya Eremin,Evelina Tsoncheva,Andrey V. Chubukov
Physics , 2007, DOI: 10.1103/PhysRevB.77.024508
Abstract: We address the issue whether the data on optical conductivity and Raman scattering in electron-doped cuprates below $T_c$ support the idea that the $d-$wave gap in these materials is non-monotonic along the Fermi surface. We calculate the conductivity and Raman intensity for elastic scattering, and find that a non-monotonic gap gives rise to several specific features in optical and Raman response functions. We argue that all these features are present in the experimental data on Nd$_{2-x}$Ce$_{x}$CuO$_4$ and Pr$_{2-x}$Ce$_{x}$CuO$_4$ compounds.
Hierarchy of mesenchymal stem cells: Comparison of multipotentmesenchymal stromal cells with fibroblast colony forming units  [PDF]
Irina N. Shipounova, Natalia A. Petinati, Alexey E. Bigildeev, Natalia V. Sats, Nina J. Drize, Larisa A. Kuzmina, Elena N. Parovichnikova, Valery G. Savchenko
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.68A1007
Abstract: The organization of the compartment of mesenchymal stem cells is still obscure. Two types of human stromal precursor cells are known. Both of them are analyzed in in vitro system: mesenchymal multipotent stromal cells (MMSC) and fibroblast colony forming units (CFU-F). The aim of this study was to compare the main characteristics of MMSC and CFU-F derived from the bone marrow of 24 healthy donors. Growth and differentiation parameters, as well as relative expression levels of different genes were analyzed in MMSC and CFU-F. MMSC were cultivated for 5 passages. CFU-F concentration was determined for each bone marrow sample. The data obtained demonstrated the heterogeneity and hierarchical organization of both studied populations of stromal precursor cells-MMSC and CFU-F. These two types of stromal precursor cells turned to be different in most parameters studied. Altogether MMSC seemed to be more immature cells than CFU-F and took up the higher position in hierarchical tree of mesenchymal stem cells. The rate of differentiation and proliferative potential decreased with the donor’s age in both populations MMSC and CFU-F.
Use of the Tissue Doplerography in Assessment of a Chronic Cardiac Insufficiency Gravity in Patients with a Postmyocardial Infarction Cardiosclerosis
A.G. Kuzmin,V.V. Gorbunov,E.V. Goryainova,O.V. Kuzmina
Sovremennye Tehnologii v Medicine , 2010,
Abstract: Aim of investigation is a study of a systolic intra- and interventricular dissynchronism expression in patients with a chronic cardiac insufficiency of the functional class II, III depending on a type of a postmyocardial infarction resimulation of the left ventricle with a use of a tissue doplerography.Materials and methods. 150 patients with a chronic cardiac insufficiency of the functional class II and III because of the ischemic heart disease (IHD) in all the patients are examined. The echocardiographic investigation with calculation of the left ventricle resimulation indices, the values characterizing its systolic function, several values assessing the left ventricle preloading, was made. A method of tissue doplerography in the impulse and wave mode was used for investigation of the intra- and interventricular dissynchronism.Conclusion. The intra- and interventricular systolic dissynchronism is intensified with an increase of the chronic cardiac insufficiency clinical manifestation gravity.
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