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Search Results: 1 - 10 of 258413 matches for " Konovalov F. V. "
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RESEARCH OF STEADY FORCED OSCILLATIONS IN A DIRECT CURRENT ELECTRIC DRIVE WITH A THYRISTOR CONVERTER IN THE CONTINIOUS CURRENTS MODE Исследование установившихся вынужденных колебаний в электроприводе постоянного тока с тиристорным преобразователем в режиме непрерывных токов
Dobrobaba Y. P.,Shevchenko Z. I.,Konovalov F. V.,Khortsev A. L.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: In this article, the software that allows to determine the ranges of deviations of a motor anchor chain current and angular velocity deviations of a DC elec-tric drive with a thyristor converter in the continuous currents mode has been presented
Disk Bimorph-Type Piezoelectric Energy Harvester  [PDF]
V. Tsaplev, R. Konovalov, K. Abbakumov
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34010
Abstract:

The study of the experimental investigation of a disk-type piezoelectric energy harvester presented. The harvester contains disk bimorph piezoceramic element of the umbrella form and contains two disk PZT plates. The element is excited at the base point at its center. The element is supplied by a loading ring mass to decrease its resonance frequency. The dependences of the vibration displacement along the radii of the bimorph and the ring mass from the frequency of excitation are presented and the output voltage frequency response is also presented as well. The idle mode and the load duty are investigated. The value of the internal resistance of the harvester is obtained using the load characteristic. The piezoelectric specific power is estimated experimentally.

Ice shelf flexures modeled with a 2-D elastic flow line model
Y. V. Konovalov
The Cryosphere Discussions , 2011, DOI: 10.5194/tcd-5-2841-2011
Abstract: Ice shelf flexures modeling was performed using a 2-D finite-difference elastic model, which takes into account sub-ice-shelf sea water flow. The sub-ice water flow was described by the wave equation for the sub-ice-shelf pressure perturbations (Holdsworth and Glynn, 1978). In the model ice shelf flexures result from variations in ocean pressure due to changes in prescribed sea levels. The numerical experiments were performed for a flow line down one of the fast flowing ice streams of the Academy of Sciences Ice Cap. The profile includes a part of the adjacent ice shelf. The numerical experiments were carried out for harmonic incoming pressure perturbations P' and the ice shelf flexures were obtained for a wide spectrum of the pressure perturbations frequencies, ranging from tidal periods down to periods of a few seconds (0.004..0.02 Hz). The amplitudes of the ice shelf deflections obtained by the model achieve a maxima at about T ≈ 165 s in concordance with previous investigations of the impact of waves on Antarctic ice shelves (Bromirski et al., 2010). The explanation of the effect is found in the solution of the corresponding eigenvalue problem revealing the existence of a resonance at these high frequencies.
Methodical Aspects of Realisation of the Mechanism of the State-private Partnership Методические аспекты реализации механизма государственно-частного партнерства
Konovalovа Anna V.
Business Inform , 2013,
Abstract: The article speaks about additional possibilities of regional development by means of use of schemes of the state-private partnership in financing investment projects and development of regional mechanisms of stimulation of concession schemes, especially in the projects of social infrastructure. The article considers instruments of realisation of projects of the state-private partnership, identifies goals and significance of these projects for each participant. It analyses different schemes of project financing with an accent on financing by means of the funds of the Investment fund and Foreign Trade Bank. It identifies factors that have positive and negative impact on realisation of the projects of the state-private partnership. В статье идет речь о дополнительных возможностях регионального развития за счет использования схем государственно-частного партнерства финансирования инвестиционных проектов и развития региональных механизмов стимулирования концессионных схем, особенно в проектах социальной инфраструктуры. Рассмотрен инструментарий реализации проектов государственно-частного партнерства, определены цели и значение данных проектов для каждого участника. Проанализированы различные схемы финансирования проектов, с акцентом на финансирование за счет средств Инвестиционного фонда и Внешэкономбанка. Определены факторы, положительно и негативно влияющие на реализацию проектов государственно-частного партнерства.
Cell Differentiation of Pluripotent Tissue Sheets Immobilized on Supported Membranes Displaying Cadherin-11
Alexander K?rner, Christina Deichmann, Fernanda F. Rossetti, Almut K?hler, Oleg V. Konovalov, Doris Wedlich, Motomu Tanaka
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0054749
Abstract: Investigating cohesive tissue sheets in controlled cultures still poses a challenge since the complex intercellular interactions are difficult to mimic in in vitro models. We used supported lipid membranes functionalized by the adhesive part of the extracellular domain of the cell adhesion molecule cadherin-11 for the immobilization of pluripotent tissue sheets, the animal cap isolated from Xenopus laevis blastula stage embryos. Cadherin-11 was bound via histidine tag to lipid membranes with chelator head groups. In the first step, quantitative functionalization of the membranes with cadherin-11 was confirmed by quartz crystal microbalance and high energy specular X-ray reflectivity. In the next step, animal cap tissue sheets induced to neural crest cell fate were cultured on the membranes functionalized with cadherin-11. The adhesion of cells within the cohesive tissue was significantly dependent on changes in lateral densities of cadherin-11. The formation of filopodia and lamellipodia in the cohesive tissue verified the viability and sustainability of the culture over several hours. The expression of the transcription factor slug in externally induced tissue demonstrated the applicability of lipid membranes displaying adhesive molecules for controlled differentiation of cohesive pluripotent tissue sheets.
Study of the Stress-Strain State in the Mined Potassium Massif with Inclined Bedding  [PDF]
M. A. Zhuravkov, A. V. Krupoderov, O. L. Konovalov
Geomaterials (GM) , 2014, DOI: 10.4236/gm.2014.41001
Abstract:

This paper presents results which concern regularities of propagation of discontinuous zones from mined-out space in rock massif with inclined bedding structure. The dependencies of maximal height of these zones from the inclination angle of productive beds were found. The mechanical model of rock massif was chosen as viscoelastic and transversely isotropic. Finite element method was used for calculation performing. Coulumb-Mohr and maximal elongation criteria were used for determination of discontinuous zones.

Liquid Argon Ionization Detector for Double Beta Decay Studies
V. D. Ashitkov,A. S. Barabash,S. G. Belogurov,G. Carugno,S. I. Konovalov,F. Massera,G. Puglierin,R. R. Saakyan,V. N. Stekhanov,V. I. Umatov
Physics , 2003,
Abstract: A multisection liquid argon ionization detector was developed by the DBA collaboration to study the double beta- decay of $^{100}$Mo. The experiment was carried out in the Gran Sasso underground laboratory in Italy. The detector design and main characteristics are described. The $\beta \beta (2\nu)$ decay of $^{100}$Mo was observed and its half-life measured: $T_{1/2}=[7.2 \pm 0.9(stat) \pm 1.8(syst)] \times 10^{18}$ yr. Limits on the 0$\nu $ and 0$\nu \chi ^{0}$ modes of the decay were obtained: $T_{1/2}> 8.4(4.9) \times 10^{21}$ yr and $T_{1/2}> 4.1(3.2)\times 10^{20}$ yr at 68% (90%) C.L., respectively. In addition the upper limits on the $^{42}$Ar content and $^{222}$Rn activity in liquid Ar were found to be $4.3 \times 10^{-21}$ g/g and $1.2 \times 10^{-3}$ Bq/kg, respectively.
The Gregoriev Ice Cap length changes derived by 2-D ice flow line model for harmonic climate histories
Y. V. Konovalov,O. V. Nagornov
Solid Earth Discussions , 2009, DOI: 10.5194/sed-1-55-2009
Abstract: Different ice thickness distributions along the flow line and the flow line length changes of the Gregoriev Ice Cap, Terskey Ala-Tau, Central Asia, were obtained for some surface mass balance histories which can be considered as possible surface mass balances in the future. The ice cap modeling was performed by solving of steady state hydrodynamic equations in the case of low Reynolds number in the form of the mechanical equilibrium equation in terms of stress deviator components coupled with the continuity equation for incompressible fluid. The numerical solution was obtained by the finite difference method. A compound approximation of the ice surface boundary condition based on the extending of the mechanical equilibrium equation to ice surface points was applied. The approximation is considered as a way to overcome the problem of diagnostic equations numerical solution stability in the full model. The basal sliding can arise in the glacier tongue at certain climatic conditions and was introduced both through linear and through non-linear friction laws. A possible glacier length history, that corresponds to the regional climate changes derived from the tree-rings data, was obtained by the model. The correlations between the glacier length changes and annual air temperature histories were investigated within the simplified equation introduced by J. Oerlemans in the form of linear dependence of annual air temperature versus glacier length and time derivative of the length. The parameters of the dependence were derived from modeled glacier length histories that correspond to harmonic climate histories. The parameters variations were investigated for different periodicities of harmonic climate histories and appropriate dependences are presented in the paper. The results of the modeling are in a good agreement with the J. Oerlemans climatic model.
The Gregoriev Ice Cap evolution according to the 2-D ice flowline model for various climatic scenarios in the future
Y. V. Konovalov,O. V. Nagornov
The Cryosphere Discussions , 2009,
Abstract: Different flowline thickness distributions and flowline length changes of the Gregoriev Ice Cap were obtained for some surface mass balance histories which can be considered as possible surface mass balances in the future. The ice cap modeling was performed by solving full Stokes equations in the form of one mechanical equilibrium equation in terms of stress deviator components in couple with continuity equation for incompressible substance. The numerical solution was obtained by the finite-difference method. The problem of diagnostic equations stability was overcome by a~compound approximation of the ice surface boundary condition based on the extending of the mechanical equilibrium equation to ice surface points. The problem of stability in the prognostic equation can arise at relatively small grid size in horizontal direction in the case of steep velocity decreasing closely to the ice front and was overcome by introducing the artificial viscosity into the prognostic equation. The basal sliding can arise in the glacier tongue at certain climatic conditions and was introduced through the linear friction law. The correlations between glacier length changes and annual air temperature histories were investigated within the simplified equation in the form of linear dependence of annual air temperature versus the glacier length and time derivation of the length.
Spatial Resolution Analysis for Few-Views Discrete Tomography Based on MART-AP Algorithm
Alexander B. Konovalov,Vitaly V. Vlasov
ISRN Signal Processing , 2013, DOI: 10.1155/2013/356291
Abstract:
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