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Volkov, Andriy,Bazilo, Serhii,Tokar, Oleksandr,Horbachov, Kostiantyn,Lutsyshyn, Andrii,Zaitsev, Ihor,Iasechko, Maksym International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.11
The article considers the improved method and model of automated air situation assessment using a decision support system based on fuzzy networks of target installations. The advanced method of automated assessment of the air situation using the decision support system is based on the methodology of reflexive control of the first rank. With this approach, the process of assessing the air situation in the framework of the formulated task can be reduced to determining the purpose, probabilistic nature of actions and capabilities of the air target. The use of a homogeneous functional network for the formal presentation of air situation assessment processes will formally describe the process of determining classes of events during air situation assessment and the process of determining quantitative and qualitative characteristics of recognized air situation situations. To formalize the patterns of manifestation of the values of quantitative and symbolic information, it is proposed to use the mathematical apparatus of fuzzy sets.
Optically driven conductivity and magnetoresistance in a manganite-based tunnel structure
Volkov, N V,Lee, C G,Kim, P D,Eremin, E V,Patrin, G S Institute of Physics [etc.] 2009 Journal of physics. D, applied physics Vol.42 No.20
<P>In the multilayer structure, La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB>/depleted manganite layer/MnSi, the photovoltaic effect has been discovered. The depleted manganite layer in the structure is dielectric and serves as a potential barrier between the ferromagnetic conducting La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>MnO<SUB>3</SUB> and MnSi layers by the formation of a magnetic tunnel junction. The photoinduced changes in the transport properties of the magnetic tunnel structure have been observed in the current-in-plane geometry. The changes are reversible and saturate at radiation power densities over 30 mW cm<SUP>−2</SUP>. The photovoltaic effect has a threshold character: it reveals only at <I>h</I>ν > 1.17 eV. Most likely, the effect of optical radiation is related to the formation of electron–hole pairs due to interband absorption of light in the dielectric layer. A photocurrent through the tunnel junctions separating the conducting layers causes a redistribution of the current channels between the conducting layers, which influences the conductivity and the magnetoresistance of the structure.</P>
Volkov, N V,Eremin, E V,Tsikalov, V S,Patrin, G S,Kim, P D,Seong-Cho, Yu,Kim, Dong-Hyun,Chau, Nguyen Institute of Physics [etc.] 2009 Journal of Physics. D, Applied Physics Vol.42 No.6
<P>The transport and magnetotransport properties of a newly fabricated tunnel structure <I>manganite/depletion layer/manganese silicide</I> have been studied in the current-in-plane (CIP) geometry. A manganite depletion layer in the structure forms a potential barrier sandwiched between two conducting layers, one of manganite and the other of manganese silicide. The voltage–current characteristics of the structure are nonlinear due to switching conducting channels from an upper manganite film to a bottom, more conductive MnSi layer with an increase in the current applied to the structure. Bias current assists tunnelling of a carrier across the depletion layer; thus, a low-resistance contact between the current-carrying electrodes and the bottom layer is established. Below 30 K, both conducting layers are in the ferromagnetic state (magnetic tunnel junction), which allows control of the resistance of the tunnel junction and, consequently, switching of the conducting channels by the magnetic field. This provides a fundamentally new mechanism of magnetoresistance (MR) implementation in the magnetic layered structure with CIP geometry. MR of the structure under study depends on the bias current and can reach values greater than 400% in a magnetic field lower than 1 kOe. A positive MR value is related to peculiarities of the spin-polarized electronic structures of manganites and manganese silicides.</P>
Aleksandr E. Volkov,Fedor S. Belyaev,Natalia A. Volkova,Egor A. Vukolov 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.30 No.3
A two-layer beam consisting of an elastoplastic layer and a functional layer made of shape memory alloy (SMA) TiNi is considered. Constitutive relations for SMA are set by a microstructural model capable to calculate strain increment produced by arbitrary increments of stress and temperature. This model exploits the approximation of small strains. The equations to calculate the variations of the strain and the internal variables are based on the experimentally registered temperature kinetics of the martensitic transformations with an account of the crystallographic features of the transformation and the laws of equilibrium thermodynamics. Stress and phase distributions over the beam height are calculated by steps, by solving on each step the boundary-value problem for given increments of the bending moment (or curvature) and the tensile force (or relative elongation). Simplifying Bernoulli's hypotheses are applied. The temperature is considered homogeneous. The first stage of the numerical experiment is modeling of preliminary deformation of the beam by bending or stretching at a temperature corresponding to the martensitic state of the SMA layer. The second stage simulates heating and subsequent cooling across the temperature interval of the martensitic transformation. The curvature variation depends both on the total thickness of the beam and on the ratio of the layer's thicknesses.