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Aleksey L. Izhutov,Valeriy V. Iakovlev,Andrey E. Novoselov,Vladimir A. Starkov,Aleksey A. Sheldyakov,Valeriy Yu Shiishin,Vladimir M. Kosenkov,Aleksandr V. Vatulin,Irina V. Dobrikova,Vladimir B. Suprun 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.7
The paper summarizes the irradiation test and post-irradiation examination (PIE) data for the U-Mo low-enriched fuel thatwas irradiated in the MIR reactor under the RERTR Program. The PIE data were analyzed for both full-size fuel rods andmini-rods with atomized powder dispersed in Al matrix as well as with additions of 2%, 5% and 13% of silicon in the matrixand ZrN protective coating on the fuel particles. The full-size fuel rods were irradiated up to an average burnup of ~ 60%235U; the mini-rods were irradiated to an averageburnup of ~ 85%235U. The presented data show a significant increase of the void fraction in the U-Mo alloy as the U-235burnup rises from ~ 40% up to ~ 85%. The effect of irradiation test conditions and U-235 burnup were analyzed with regard tothe formation of an interaction layer between the matrix and fuel particles as well as generation of porosity in the U-Mo alloy. Shown here are changes in distribution of U fission products as the U-235 burnup increases from ~ 40% up to ~ 85%.
Izhutov, Aleksey.L.,Iakovlev, Valeriy.V.,Novoselov, Andrey.E.,Starkov, Vladimir.A.,Sheldyakov, Aleksey.A.,Shishin, Valeriy.Yu.,Kosenkov, Vladimir.M.,Vatulin, Aleksandr.V.,Dobrikova, Irina.V.,Suprun, V Korean Nuclear Society 2013 Nuclear Engineering and Technology Vol.45 No.7
The paper summarizes the irradiation test and post-irradiation examination (PIE) data for the U-Mo low-enriched fuel that was irradiated in the MIR reactor under the RERTR Program. The PIE data were analyzed for both full-size fuel rods and mini-rods with atomized powder dispersed in Al matrix as well as with additions of 2%, 5% and 13% of silicon in the matrix and ZrN protective coating on the fuel particles. The full-size fuel rods were irradiated up to an average burnup of ${\sim}60%^{235}U$; the mini-rods were irradiated to an average burnup of ${\sim}85%^{235}U$. The presented data show a significant increase of the void fraction in the U-Mo alloy as the U-235 burnup rises from ~ 40% up to ~ 85%. The effect of irradiation test conditions and U-235 burnup were analyzed with regard to the formation of an interaction layer between the matrix and fuel particles as well as generation of porosity in the U-Mo alloy. Shown here are changes in distribution of U fission products as the U-235 burnup increases from ~ 40% up to ~ 85%.
Aleksey Ni,Taqi Ahmad Cheema,박철우 한국유변학회 2015 Korea-Australia rheology journal Vol.27 No.2
Alcohol significantly affects blood rheology and influences the mechanical behavior of red blood cells (RBCs). Previous studies indicate that plasma-RBC and multiple RBC interaction are important indicators for atherosclerosis progression. Therefore, multiphysics interactions under highly viscous conditions of alcohol consumption and stenosis structure must be investigated. A 2D microcapillary model, wherein multiple RBCs float through a stenotic structure, was established to investigate the effect of alcohol on cell motion and deformability under various flow conditions. Results show that the deformed cells inside the stenosis increase flow resistance and increase plasma velocity gradient in the pre and post stenotic regions Moreover, the effect of the initial RBC position is important describing the RBC deformation pattern. The structural properties of RBCs may be significantly affected when the stenosis path is filled by cells that increase flow resistance
Feedback Linearization of Nonlinear Singularly Perturbed Systems with State-dependent Coefficients
Aleksey A. Kabanov 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.7
The article examines a feedback linearization (FL) problem for a nonlinear singular perturbed (SP) system in a state-dependent coefficients form (SDC-form). The combination of the composite control technique of singular perturbation theory and a canonical similarity transformation approach for systems in a SDC-form are explored in this research. As a result, two FL problems for a fast state variables subsystem and a slow state variables subsystem are solved separately. The transformation matrix and feedback linearizing control for the entire nonlinear SP system are designed as a composition of solutions of these two FL problems. The composite stabilizing controller, based on feedback linearization and a pole placement method, is proposed for a nonlinear SP system in a SDC-form. Practical implementation of the proposed feedback linearizing composite stabilizing control is shown through an example (an inverted pendulum, controlled by a direct current motor).
Aleksey Ni,Taqi Ahmad Cheema,곽문규,박철우 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.3
A two-dimensional computational model of a single red blood cell (RBC) floating in a plasma-alcoholsolution through a microchannel with stenosis was created using the Arbitrary Lagrangian-Eulerian(ALE) method with moving mesh for a fluid structure interaction problem. Cell deformability and stabilitywere studied in a plasma-alcohol solution at different fluid flow conditions during movementthrough the channel with stenosis. Different results were obtained for different input parameters. Motionthrough 45% and 70% stenoses with the high and law velocities of the RBC and different viscosities wasanalyzed and successfully simulated. Results show that changes in RBC deformability were due to theeffects of alcohol. Changes in behavior during motion were also observed. At low shear rate and highsurrounding fluid viscosity the RBC showed a tendency to rotate during movement. The proposed modelwith its coupling of structural and fluid analysis techniques could be useful to understand the effect ofalcohol on the RBC passing through stenosis.
Modeling of the Formation of Long Grooves in the Seabed by Grounded Ice Keels
Marchenko, Aleksey The Society of Naval Architects of Korea 2003 Journal of ship and ocean technology Vol.7 No.4
The motion of passively floating body, whose keel can have a contact with seabed soil, is under the consideration. The body simulates ice ridge floating in shallow water. The force of seabed soil reaction applied to the grounded keel is estimated taking into account soil embankment near the grounded keel. Two-dimensional trajectories of body motion, the shape of the grooves in seabed and the height of soil embankment are calculated when the motion of the body is caused by semidiurnal $M_2$ tide. The influence of wave amplitude and bottom slope on the shapes of body trajectory and the grooves are analyzed.