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  • 1
    Language: English
    In: Chemical reviews, 11 December 2013, Vol.113(12), pp.9016-42
    Description: This comprehensive review summarizes our current understanding of the evolution of gas, solids and molecular ices in protoplanetary disks. Key findings related to disk physics and chemistry, both observationally and theoretically, are highlighted. We discuss which molecular probes are used to derive gas temperature, density, ionization state, kinematics, deuterium fractionation, and study organic matter in protoplanetary disks.
    Keywords: Chemistry;
    ISSN: 00092665
    E-ISSN: 1520-6890
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  • 2
    Language: English
    In: The Journal of Chemical Physics, 28 June 2018, Vol.148(24)
    Description: We developed the mixed quantum/classical theory (MQCT) for rotationally and vibrationally inelastic scattering of a diatomic molecule in a 2S+1 Σ electronic state with a closed-shell atom. In this approach, the rotational (and vibrational) fine-structure states of the molecule are treated quantum-mechanically, whereas the relative motion of collisional partners is treated classically. This theory is benchmarked against full quantum (close-coupling) calculations for the NH(X 3 Σ − ) + He system. Good agreement is found in all cases, and MQCT reproduces all main features of energy dependence of the cross section, except narrow scattering resonances at very low energies. Our method recovers propensity rules that govern values of close-coupling cross sections. Particularly, MQCT correctly predicts that the magnitudes of F -conserving transitions are significantly larger than those of F -changing ones. This new development makes MQCT a viable candidate for obtaining fine-structure resolved rotational rate coefficients at higher temperatures and for complex polyatomic systems where the standard full quantum treatment is computationally infeasible.
    Keywords: Articles
    ISSN: 0021-9606
    E-ISSN: 1089-7690
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  • 3
    Language: English
    In: The Journal of Chemical Physics, 28 July 2015, Vol.143(4)
    Description: We propose a new spin-glass model with no positional quenched disorder which is regarded as a coarse-grained model of a structural glass-former. The model is analyzed in the 1D case when the number N of states of a primary cell is large. For N → ∞, the model exhibits a sharp freezing transition of the thermodynamic origin. It is shown both analytically and numerically that the glass transition is accompanied by a significant growth of a static length scale ξ pointing to the structural (equilibrium) nature of dynamical slowdown effects in supercooled liquids.
    Keywords: Articles
    ISSN: 0021-9606
    E-ISSN: 1089-7690
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  • 4
    In: PLoS ONE, 2014, Vol.9(12)
    Description: In this paper, we propose an approach for modeling and analysis of a number of phenomena of collective behavior. By collectives we mean multi-agent systems that transition from one state to another at discrete moments of time. The behavior of a member of a collective (agent) is called conforming if the opinion of this agent at current time moment conforms to the opinion of some other agents at the previous time moment. We presume that at each moment of time every agent makes a decision by choosing from the set (where 1-decision corresponds to action and 0-decision corresponds to inaction). In our approach we model collective behavior with synchronous Boolean networks. We presume that in a network there can be agents that act at every moment of time. Such agents are called instigators. Also there can be agents that never act. Such agents are called loyalists. Agents that are neither instigators nor loyalists are called simple agents. We study two combinatorial problems. The first problem is to find a disposition of instigators that in several time moments transforms a network from a state where the majority of simple agents are inactive to a state with the majority of active agents. The second problem is to find a disposition of loyalists that returns the network to a state with the majority of inactive agents. Similar problems are studied for networks in which simple agents demonstrate the contrary to conforming behavior that we call anticonforming. We obtained several theoretical results regarding the behavior of collectives of agents with conforming or anticonforming behavior. In computational experiments we solved the described problems for randomly generated networks with several hundred vertices. We reduced corresponding combinatorial problems to the Boolean satisfiability problem (SAT) and used modern SAT solvers to solve the instances obtained.
    Keywords: Research Article ; Computer And Information Sciences ; Physical Sciences ; Research And Analysis Methods
    E-ISSN: 1932-6203
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  • 5
    Language: English
    In: Thin Solid Films, 31 August 2012, Vol.520(21), pp.6626-6630
    Description: The optical and photoluminescence (PL) properties of nanocrystalline 3C-SiC films and the effect of the boundary regions between the nanocrystals were studied for two sets of films: (a) films with 10–15 nm nanocrystal size obtained by direct ion deposition method and (b) similar films annealed in oxygen at 850–950 °C. It was shown that annealing of the nanocrystalline SiC films resulted in weaker absorption in a broad spectral range, and to the increase of the optical band gap from 1.8 to 2.2 eV. On the contrary, the edge PL bands in the UV range (2.2 to 2.4 eV) remained similar. In the IR range, three maxima absent in the as-grown films, appeared at 1.52 eV, 1.56 eV and 1.63 eV. Measurement of the intensity of PL maxima as a function of the excitation power showed a nonlinear dependence that was attributed to the onset of stimulated emission. ► We prepared the as-grown and annealed nanocrystalline (nc) SiC films. ► We studied the optical and photoluminescence (PL) properties of the nc-SiC films. ► The boundary regions between the nanocrystals affect the properties of films. ► Three PL maxima absent in the as-grown films appeared in the annealed films. ► The intensity of the PL maxima has a nonlinear dependence on excitation power.
    Keywords: Silicon Carbide Nanocrystalline Films ; High-Temperature Annealing ; Optical Properties ; Photoluminescence Properties ; Stimulated Emission ; Engineering ; Physics
    ISSN: 0040-6090
    E-ISSN: 1879-2731
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  • 6
    Language: English
    In: Physics of the Solid State, 2011, Vol.53(2), pp.386-389
    Description: A switching wave has been studied in the VO 2 film during the photoinduced semiconductor-metal phase transition. The dependences of the critical radiation intensities corresponding to the direct and reverse phase transitions on the ambient temperature have been obtained in the framework of the thermal model. The profile and velocity of the switching wave have been calculated. The calculated data are compared with the experimental data.
    Keywords: Vanadium;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 7
    Language: English
    In: The Physics of Metals and Metallography, 2011, Vol.111(5), pp.441-450
    Description: A calculation of the Néel domain wall in single-layer and two-layer magnetic films has been performed. It has been shown that the magnetization in a single-layer film changes not only in the film plane but also over the film thickness.
    Keywords: thin magnetic film ; Néel domain wall ; single-layer film
    ISSN: 0031-918X
    E-ISSN: 1555-6190
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  • 8
    Language: English
    In: Cybernetics and Systems Analysis, 2011, Vol.47(1), pp.95-105
    Description: A lower semicontinuous functional disturbed by a Minkowski functional of a closed bounded convex neighborhood of zero possessing the Kadets–Klee property is minimized on a closed subset X of a reflexive Banach space E. It is proved that the set of parameters for which the problem has a solution contains a G δ -subset dense in E \ X. It is shown that the reflexivity condition and the condition of the Kadets–Klee property of the neighborhood cannot be weakened. The application to optimization problems for linear systems with vector performance criteria is considered.
    Keywords: density ; Baire category ; solvability ; minimization ; semicontinuity ; Kadets–Klee property ; vector optimization
    ISSN: 1060-0396
    E-ISSN: 1573-8337
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  • 9
    Language: English
    In: Physics of the Solid State, 2011, Vol.53(11), pp.2339-2342
    Description: The equation of the photoinduced dynamics for atoms of the crystal lattice of Bi has been obtained. The time dependence of atomic shifts under the effect of an ultrashort laser pulse on the crystal has been calculated based on this equation. It has been shown that the frequency of the oscillating part of the shifts depends on the energy density of the laser pulse and time. The intensity of the Fourier spectrum of photoinduced coherent vibrations of the crystal lattice (coherent phonons) has been calculated. The obtained theoretical results have been compared with the experimental data.
    Keywords: Vibration (Physics);
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 10
    Language: English
    In: Journal of Mathematical Sciences, 2013, Vol.193(4), pp.591-600
    Description: Let R be a linearly ordered commutative ring with 1 / 2 and G n ( R ) be the subsemigroup of GL n ( R ) consisting of matrices with nonnegative elements. In this paper, we describe endomorphisms of this semigroup for n ≥ 3.
    Keywords: Mathematics ; Mathematics, General ; Mathematics;
    ISSN: 1072-3374
    E-ISSN: 1573-8795
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