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  • English  (1,914)
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  • 1
    Language: English
    In: Journal of Engineering Physics and Thermophysics, 2012, Vol.85(2), pp.423-431
    Description: With the aim of developing a new methodology of thermal investigations of heat-insulating structures and materials, the features of quasi-stationary heat conduction in a flat wall under varying ambient conditions have been considered. The quasi-stationary approximation errors and the applicability criteria of stationary relations between the thermal parameters of the medium imposing restrictions on the rate of change in boundary temperatures have been determined. The possibility of using nonstationary states and stable conditions in thermal diagnostics of exterior walls has been shown.
    Keywords: heat conduction in a flat wall ; variable boundary conditions ; stationary relations ; thermal parameters ; thermal diagnostics
    ISSN: 1062-0125
    E-ISSN: 1573-871X
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  • 2
    Language: English
    In: Physical Review B, 7/2012, Vol.86(1)
    Description: The quantum antiferromagnetic spin-1/2 Ising model on a triangular lattice and analogous fully frustrated Ising model on a square lattice with quantum fluctuations induced by the application of the transverse magnetic field are studied at finite temperatures by constructing an exact mapping onto a purely classical model with a more complex interaction. It is shown that in weak fields the temperatures of the phase transitions separating the critical phase from the ordered and disordered phases in both models are proportional to the magnitude of the field. Comment: 5 pages, RevTex4
    Keywords: Condensed Matter - Strongly Correlated Electrons;
    ISSN: 1098-0121
    E-ISSN: 1550-235X
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  • 3
    Language: English
    In: Physical Review B, 4/2012, Vol.85(13)
    Description: The phase diagram of the fully frustrated XY model on a honeycomb lattice is shown to incorporate three different ordered phases. In the most unusual of them, a long-range order is related not to the dominance of a particular periodic vortex pattern but to the orientation of zero-energy domain walls separating domains with different orientations of vortex stripes. The phase transition leading to the destruction of this phase can be associated with the appearance of free fractional vortices and is of the first order. The stabilization of the two other ordered phases (existing at lower temperatures) relies a positive contribution to domain-wall free energy induced by the presence of spin waves. This effect has a substantial numerical smallness, in accordance with which these two phases can be observed only in the systems of really macroscopic sizes. In physical systems (like magnetically frustrated Josephson junction arrays and superconducting wire networks), the presence of additional interactions must lead to a better stabilization of the phase with the long-range order in terms of vortex pattern and improve the possibilities of its observation. Comment: 20 pages, 11 figures
    Keywords: Condensed Matter - Statistical Mechanics ; Condensed Matter - Superconductivity;
    ISSN: 1098-0121
    E-ISSN: 1550-235X
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  • 4
    Language: English
    In: Physical Review B, 8/2015, Vol.92(6)
    Description: We show that a physical realization of the phase diagram proposed by Minnhagen et al. [Phys. Rev. B 78, 184432 (2008) (http://dx.doi.org/10.1103/PhysRevB.78.184432)] for the socalled generalized fully frustrated XY model on a square lattice can be achieved in arrays of superconductor-ferromagnet-superconductor junctions near the transition of the junctions to the [pi] state. Moreover, the phase diagram with such a topology has to be reproduced twice, on both sides of the 0-[pi] transition.
    Keywords: Phase Diagrams ; Topology ; Condensed Matter ; Lattices ; Arrays ; Condensed Matter Physics (General) (So) ; Physics of Metals (MD) ; Atomic Properties (Ep) ; Atomic Properties (Ed) ; Atomic Properties (EC) ; Solid-State Physics (Ah);
    ISSN: 1098-0121
    E-ISSN: 1550-235X
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  • 5
    In: Molecular Microbiology, March 2010, Vol.75(6), pp.1389-1401
    Description: Mechanisms of hydrogen peroxide generation in were investigated using a strain lacking scavenging enzymes. Surprisingly, the deletion of many abundant flavoenzymes that are known to autoxidize did not substantially lessen overall HO formation. However, HO production diminished by 25–30% when NadB turnover was eliminated. The flavin‐dependent desaturating dehydrogenase, NadB uses fumarate as an electron acceptor in anaerobic cells. Experiments showed that aerobic NadB turnover depends upon its oxidation by molecular oxygen, with HO as a product. This reaction appears to be mechanistically adventitious. In contrast, most desaturating dehydrogenases are associated with the respiratory chain and deliver electrons to fumarate anaerobically or oxygen aerobically without the formation of toxic by‐products. Presumably, NadB can persist as an HO‐generating enzyme because its flux is limited. The anaerobic respiratory enzyme fumarate reductase uses a flavoprotein subunit that is homologous to NadB and accordingly forms substantial HO upon aeration. This tendency is substantially suppressed by cytochrome oxidase. Thus cytochrome oxidase, which is prevalent among anaerobes, may diminish intracellular HO formation by the anaerobic respiratory chain, whenever these organisms encounter oxygen. These two examples reveal biochemical and physiological arrangements through which evolution has minimized the rate of intracellular oxidant formation.
    Keywords: Hydrogen Peroxide -- Physiological Aspects ; Escherichia Coli -- Physiological Aspects ; Cytochrome Oxidase -- Physiological Aspects;
    ISSN: 0950-382X
    E-ISSN: 1365-2958
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  • 6
    Language: English
    In: Journal of Alloys and Compounds, Oct 5, 2015, Vol.645, pp.S140-S143
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jallcom.2015.01.131 Byline: K.V. Korshunov, M.V. Tsarev, V.V. Mokrushin, A.M. Shapovalov, E.V. Zabavin Abstract: * The method of impedance measurement of powder materials is developed. * Impedance spectroscopy was used to study titanium hydride powders oxidized by air oxygen at different modes. * Impedance spectroscopy seems suitable for studying of properties of shielding coatings at the particles.
    Keywords: Spectroscopy ; Powders (Particulate Matter)
    ISSN: 0925-8388
    Source: Cengage Learning, Inc.
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  • 7
    Language: English
    In: Queueing Systems, 2011, Vol.68(3), pp.261-266
    Description: We discuss the problem of establishing an upper bound for the distribution tail of the stationary waiting time D in the GI / GI /1 FCFS queue.
    Keywords: FCFS single server queue ; Stationary waiting time ; Heavy tails ; Large deviations ; Long tailed distribution ; Subexponential distribution ; Integrated tail distribution ; Accuracy of approximation ; Lower and upper bounds
    ISSN: 0257-0130
    E-ISSN: 1572-9443
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  • 8
    Language: English
    In: Physical review letters, 13 May 2016, Vol.116(19), pp.197201
    Description: Using a specially designed Monte Carlo algorithm with directed loops, we investigate the triangular lattice Ising antiferromagnet with coupling beyond the nearest neighbors. We show that the first-order transition from the stripe state to the paramagnet can be split, giving rise to an intermediate nematic phase in which algebraic correlations coexist with a broken symmetry. Furthermore, we demonstrate the emergence of several properties of a more topological nature such as fractional edge excitations in the stripe state, the proliferation of double domain walls in the nematic phase, and the Kasteleyn transition between them. Experimental implications are briefly discussed.
    Keywords: Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Statistical Mechanics;
    ISSN: 00319007
    E-ISSN: 1079-7114
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  • 9
    Language: English
    In: Physical Review B, 6/2011, Vol.83(23)
    Description: We propose a new quantum model interpolating between the fully frustrated spin-1/2 Ising model in a transverse field and a dimer model. This model contains a resonating-valence-bond phase, including a line with an exactly solvable ground state of the Rokhsar-Kivelson type. We discuss the phase diagrams of this model on the square and triangular (in terms of the dimer representation) lattices. Comment: 9 pages, 7 figures
    Keywords: Condensed Matter - Strongly Correlated Electrons;
    ISSN: 1098-0121
    E-ISSN: 1550-235X
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  • 10
    In: Circulation, 2012, Vol.126(20), pp.2418-2427
    Description: BACKGROUND—: Carotid intima-media thickening is associated with increased cardiovascular risk in humans. We discovered that intima formation and cell proliferation in response to carotid injury is greater in SJL/J (SJL) in comparison with C3HeB/FeJ (C3H/F) mice. The purpose of this study was to identify candidate genes contributing to intima formation. METHODS AND RESULTS—: We performed microarray and bioinformatic analyses of carotid arteries from C3H/F and SJL mice. Kyoto Encyclopedia of Genes and Genomes analysis showed that the ribosome pathway was significantly up-regulated in C3H/F in comparison with SJL mice. Expression of a ribosomal protein, RpL17, was 〉40-fold higher in C3H/F carotids in comparison with SJL. Aortic vascular smooth muscle cells from C3H/F grew slower in comparison to SJL. To determine the role of RpL17 in vascular smooth muscle cell growth regulation, we analyzed the relationship between RpL17 expression and cell cycle progression. Cultured vascular smooth muscle cells from mice, rats, and humans showed that RpL17 expression inversely correlated with growth as shown by decreased cells in S phase and increased cells in G0/G1. To prove that RpL17 acted as a growth inhibitor in vivo, we used pluronic gel delivery of RpL17 small interfering RNA to C3H/F carotid arteries. This resulted in an 8-fold increase in the number of proliferating cells. Furthermore, following partial carotid ligation in SJL mice, RpL17 expression in the intima and media decreased, but the number of proliferating cells increased. CONCLUSIONS—: RpL17 acts as a vascular smooth muscle cell growth inhibitor (akin to a tumor suppressor) and represents a potential therapeutic target to limit carotid intima-media thickening.
    Keywords: Medicine ; Anatomy & Physiology;
    ISSN: 0009-7322
    E-ISSN: 15244539
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