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700 results on '"Alexandrov, V. A."'

4. Development of an Improved Hydraulic Drive of Agricultural Machines for the Conditions of the Urals and Siberia

Author

Kolga, A. D., Alexandrov, V. A., Galiakhmetov, R. T., Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Radionov, Andrey A., editor, and Gasiyarov, Vadim R., editor

Published
2023
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14. Similarity parameters in the longitudinal cylindrical Couette problem: From the continuous to free molecular.

Author

Abramov, A. A., Alexandrov, V. Yu., and Butkovskii, A. V.

Subjects
*KNUDSEN flow, *RELATIVE velocity, *INTERIM governments, *SURFACE temperature
Abstract

We investigate the Reynolds analogy for the longitudinal cylindrical Couette problem across different velocities and temperatures in various regimes. Our analysis reveals that for the continuum and free molecular regimes, the Reynolds analogy is independent of the ratio of the boundary surface radii and only depends on the Eckert number. However, in the transitional regime, we utilize the direct simulation Monte Carlo (DSMC) method to show that the Reynolds analogy does depend on the radii ratio, in contrast to the previous regimes. Additionally, we observe that for a monatomic gas, the Reynolds analogy depends on the relative velocity and surfaces temperatures primarily through the Eckert number, given fixed values of the Knudsen number and ratio of the radii. We propose a modified Reynolds analogy that depends almost exclusively on the Knudsen number and radii ratio across all Eckert numbers considered. Furthermore, we utilize the properties of the Reynolds analogy to demonstrate that when two different flows have the same modulus but opposite Eckert numbers, the product of the ratios of the total energy fluxes transferred to the boundary surfaces is approximately or sometimes precisely equal to unity. [ABSTRACT FROM AUTHOR]

Published
2024
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20. First-principles computational study of defect clustering in solid solutions of ThO2 with trivalent oxides

Author

Alexandrov, V, Grønbech-Jensen, N, Navrotsky, A, and Asta, M

Subjects
cond-mat.mtrl-sci, Fluids & Plasmas, Physical Sciences, Chemical Sciences, Engineering
Abstract

The energetics of mixing and defect ordering in solid solutions of fluorite-structured ThO2 with oxides of trivalent cations (Sc, In, Y, Nd, and La) are investigated by electronic density-functional theory (DFT). Through DFT calculations of structures enumerated by lattice-algebra techniques, we identify the lowest energy patterns for defect clustering for four separate dopant concentrations. The most stable structures are characterized by a repulsive interaction between nearest-neighbor vacancies on the oxygen sublattice. The enthalpies of formation with respect to constituent oxides are positive for all dopants considered, and show a tendency to decrease in magnitude as the size and electronegativity of the trivalent dopant decrease. Due to the small positive formation enthalpies and low oxygen-vacancy binding energy with La dopants, La2 O3 -ThO2 solid solutions are predicted to have relatively high ionic conductivities relative to those for the other aliovalent dopants considered. Our results are compared with those for the more widely studied ZrO2 and CeO2 fluorite-structured solid solutions with trivalent cations. © 2010 The American Physical Society.

Published
2010

22. On the Existence of Two Affine-Equivalent Frameworks with Prescribed Edge Lengths in Euclidean -Space.

Author

Alexandrov, V. A.

Subjects
GEOMETRIC rigidity, PROBLEM solving
Abstract

We study the existence of the two affine-equivalent bar-and-joint frameworks in Euclidean -space which have some prescribed combinatorial structure and edge lengths. We show that the existence problem is always solvable theoretically and explain why to propose a practical algorithm for solving the problem is impossible. [ABSTRACT FROM AUTHOR]

Published
2023
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23. Selection of the best photodiode based on analysis of fluctuations/noise characteristics in the frame of the CAPoNeF method.

Author

Nigmatullin, R. R., Sagdiev, R. K., and Alexandrov, V. S.

Subjects
PHOTODIODES, ELECTRONIC data processing, COMPARATIVE method
Abstract

In this paper, the data processing method based on a comparative analysis of positive and negative fluctuations (CAPoNeF), is applied. The output signals registered from available set of photodiodes were used as original data in the absence of possible interference inductions served as external influence. The initial measurement results do not allow us to select the best photodiode. However, based on the CAPoNeF method the problem can be solved; it allows to select the best photodiode based on its fluctuation/noise characteristics. The analysis of the reduced matrix N (number of local minima) × M (number of significant parameters) allowed us to distribute the "prizes" and choose the best photodiode from the proposed ones. [ABSTRACT FROM AUTHOR]

Published
2023
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24. On the Preconditioned Quasi-Monte Carlo Algorithm for Matrix Computations

Author

Alexandrov, V., Esquivel-Flores, O., Ivanovska, S., Karaivanova, A., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Lirkov, Ivan, editor, Margenov, Svetozar D., editor, and Waśniewski, Jerzy, editor

Published
2015
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42. Parallel Hybrid Monte Carlo Algorithms for Matrix Computations

Author

Alexandrov, V., Atanassov, E., Dimov, I., Branford, S., Thandavan, A., Weihrauch, C., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sunderam, Vaidy S., editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2005
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44. Using Parallel Monte Carlo Methods in Large-Scale Air Pollution Modelling

Author

Alexandrov, V. N., Zlatev, Z., Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bubak, Marian, editor, van Albada, Geert Dick, editor, Sloot, Peter M. A., editor, and Dongarra, Jack, editor

Published
2004
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48. Introduction

Author

Alexandrov, V. V., Gorsky, N. D., Hazewinkel, M., editor, Alexandrov, V. V., and Gorsky, N. D.

Published
1993
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