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KOVALEV, ALEXEI,LEE, NAM-HOON Cambridge University Press 2011 Mathematical proceedings of the Cambridge Philosop Vol.151 No.2
<B>Abstract</B><P>We consider the connected-sum method of constructing compact Riemannian 7-manifolds with holonomy <I>G</I>2 developed by the first named author. The method requires pairs of projective complex threefolds endowed with anticanonical <I>K</I>3 divisors and the latter <I>K</I>3 surfaces should satisfy a certain ‘matching condition’ intertwining on their periods and Kähler classes. Suitable examples of threefolds were previously obtained by blowing up curves in Fano threefolds.</P><P>In this paper, we give a large new class of suitable algebraic threefolds using theory of <I>K</I>3 surfaces with non-symplectic involution due to Nikulin. These threefolds are <I>not</I> obtainable from Fano threefolds as above, and admit matching pairs leading to topologically new examples of compact irreducible <I>G</I>2-manifolds. ‘Geography’ of the values of Betti numbers <I>b</I><SUP>2</SUP>, <I>b</I><SUP>3</SUP> for the new (and previously known) examples of irreducible <I>G</I>2 manifolds is also discussed.</P>
Kovalev, Valeri V,Khotimchenko, Maxim Y,Khotimchenko, Yuri S Kyung Hee Oriental Medicine Research Center 2007 Oriental pharmacy and experimental medicine Vol.7 No.2
Metal binding activity of the pectin samples with different physicochemical properties was studied. It was found that in vitro copper binding capacity of pectins is depending on the following factors: degree of esterification, content of non-methylated anhydrogalacturonic acid, and pH of solution. There was found that the maximum copper uptake capacity increases correspondingly to reduction of the degree of esterification of pectin, rise of the non-methylated anhydrogalacturnic acid content and the solution pH. It is proposed to use for standardization of pectin samples such parameters as the degree of esterification, content of anhydrogalacturonic acid, and intrinsic viscosity.
A.I. Kovalev,A.Yu Rashkovskiy,D.L. Wainstein,R. Gago,F. Soldera,J.L. Endrino 한국물리학회 2016 Current Applied Physics Vol.16 No.4
TiAlN/Ag multilayer coatings with different number of bilayers and thicknesses of individual layer were fabricated by DC magnetron sputtering. Thermal conductivity and electronic structure features were measured on a set of samples with different number of bilayers and individual layer thickness from a 5 e150 nm for total coating thickness of ~0.5 or 1 mm. It was found that thermal conductivity of the multilayer insulator/metal structure becomes lower than for monolithic TiAlN coatings with the same thickness when Ag layers are thinner than 25 nm. The physical nature of thermal barrier properties of the nanolaminate TiAlN/Ag films is studied using X-ray photoelectrons (XPS) and high-resolution electron- energy loss (HREELS) spectroscopies. Based on these results, a physical model for the anomalous decrease in heat conductivity for nanoscale multilayers was developed on base of analysis of plasmon and lattice vibrations inside the layers and at the interfaces. Anomalously low heat transfer is attributed to attenuation of longitudinal acoustic phonons vibrations, decreasing of plasmon-polariton penetration on interfaces, and plasmon states splitting in Ag nanolayers due to confinement effects at multilayer coatings nanostructuring.
Hybrid genetic-paired-permutation algorithm for improved VLSI placement
Ignatyev, Vladimir V.,Kovalev, Andrey V.,Spiridonov, Oleg B.,Kureychik, Viktor M.,Ignatyeva, Alexandra S.,Safronenkova, Irina B. Electronics and Telecommunications Research Instit 2021 ETRI Journal Vol.43 No.2
This paper addresses Very large-scale integration (VLSI) placement optimization, which is important because of the rapid development of VLSI design technologies. The goal of this study is to develop a hybrid algorithm for VLSI placement. The proposed algorithm includes a sequential combination of a genetic algorithm and an evolutionary algorithm. It is commonly known that local search algorithms, such as random forest, hill climbing, and variable neighborhoods, can be effectively applied to NP-hard problem-solving. They provide improved solutions, which are obtained after a global search. The scientific novelty of this research is based on the development of systems, principles, and methods for creating a hybrid (combined) placement algorithm. The principal difference in the proposed algorithm is that it obtains a set of alternative solutions in parallel and then selects the best one. Nonstandard genetic operators, based on problem knowledge, are used in the proposed algorithm. An investigational study shows an objective-function improvement of 13%. The time complexity of the hybrid placement algorithm is O(N2).
Magnetoplasmon Fano resonance in Bose-Fermi mixtures
Boev, M. V.,Kovalev, V. M.,Savenko, I. G. American Physical Society 2016 Physical Review B Vol.94 No.24
<P>We investigate theoretically the magnetoplasmon (cyclotron) resonance in a hybrid system consisting of spatially separated two-dimensional layers of electron and dipolar exciton gases coupled via Coulomb forces. We study the dynamics of this system under the action of a weak alternating external electromagnetic field in the presence of a uniform magnetic field, perpendicular to the layers. We reveal that the electromagnetic power absorption exhibits a double-resonance spectrum. We show that the first resonance is associated with the conventional well-studied magnetoplasmon excitations of the electron gas and it has a standard Lorentzian shape, whereas the second resonance is a peculiarity attributed to the Bose-condensed exciton gas. Further, we explicitly demonstrate that the spectrum of the system exhibits an asymmetric Fano-type profile, where the excitonic peak is extremely narrow in comparison with the magnetoplasmon one. We show that the shape of the resonance and the position of the peaks depend on the magnitude of the applied magnetic field, exciton-condensate density, and exciton-impurity scattering time. In particular, the Fano profile turns into a Lorentzian shape with decreasing exciton-impurity scattering time and the position of the plasmon-associated resonance is mainly sensitive and determined by the magnetic field strength, whereas the exciton-condensate peak position is determined by the exciton-condensate density. It opens the experimental possibility to determine the latter quantity in cyclotron resonance experiments.</P>