Search results for: A. Lebedev

Items from 1 to 20 out of 1,004 results

article

Time resolved study of ignition of microwave discharge in liquid hydrocarbons

Yuri A. Lebedev, Galina V. Krashevskaya, Timur S. Batukaev, Andrey V. Mikhaylyuk

Plasma Processes and Polymers > 19 > 5 > n/a - n/a

Results of the study of acoustic phenomena and changes in the structure of the microwave (2.45 GHz) discharge in liquid hydrocarbons in time are presented. Discharge was ignited at the tip of microwave antennas with conical or rounded ends. Petroleum solvent Nefras was chosen as representative of liquid hydrocarbons. Electret microphone and high‐speed video cameras were used to study the discharge...

article

Influence of Composition on Energetic Properties of Copper Oxide – Aluminum Powder Nanothermite Materials Formed by Electrophoretic Deposition

Egor A. Lebedev, Larisa I. Sorokina, Alexey Y. Trifonov, Roman M. Ryazanov, more

Propellants, Explosives, Pyrotechnics > 47 > 2 > n/a - n/a

We investigated the reactions in composite thermite layers consisting of Al, CuO, and Cu₂O nanoparticles formed by electrophoretic deposition on a titanium substrate. The composition determined the reaction propagation rates and heat effects in oxygen and oxygen‐free atmospheres. It was found that a stable self‐propagating exothermic reaction in the aluminum‐copper oxide layer takes place in the range...

article

Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

Ahmed E. Amer, Mohamed M. Elsakka, Vladimir A. Lebedev

International Journal of Energy Research > 45 > 13 > 19089 - 19102

Melting rate enhancement inside an accumulator unit for a phase change material (PCM) has been numerically investigated in a shell‐and‐tube (S‐T) arrangement that incorporates the circular type of fins, considering a fixed total volume of fins. The number of fins was chosen as the design parameter. The heat transfer fluid (HTF) was chosen as water that flows through the selected accumulator unit during...

article

Light emission from microwave discharges in liquid hydrocarbons at the initial stages of their development

Yuri A. Lebedev, Galina V. Krashevskaya, Timur S. Batukaev, Irene L. Epstein

Plasma Processes and Polymers > 18 > 10 > n/a - n/a

Time‐resolved optical techniques (spectrograph, high‐speed camera, photodiode) were used for scrutinizing the initial stages of the microwave discharge (2.45 GHz, 200–500 W) achieved in liquid alkanes (C_nH_2n + 2). Petroleum solvent Nefras S2 80/120 (a mixture of light hydrocarbons with boiling temperatures ranging between 33°C and 205°C) was considered to be representative of alkanes. The discharge...

article

Raman spectroscopy of human skin for kidney failure detection

Lyudmila A. Bratchenko, Ivan A. Bratchenko, Yulia A. Khristoforova, Dmitry N. Artemyev, more

Journal of Biophotonics > 14 > 2 > n/a - n/a

The object of this paper is in vivo study of skin spectral‐characteristics in patients with kidney failure by conventional Raman spectroscopy in near infrared region. The experimental dataset was subjected to discriminant analysis with the projection on latent structures (PLS‐DA). Application of Raman spectroscopy to investigate the forearm skin in 85 adult patients with kidney failure (90 spectra)...

article

Optical emission spectra of microwave discharge in different liquid hydrocarbons

Yuri A. Lebedev, Viatcheslav A. Shakhatov

Plasma Processes and Polymers > 17 > 8 > n/a - n/a

Emission spectra of microwave discharge in liquid hydrocarbons (hexane (C₆H₁₄), n‐heptane (С₇Н₁₆), decane (С₁₀Н₂₂), pentadecane (C₁₅H₃₂), cyclohexane (С₆Н₁₂), toluene (С₆Н₅–СН₃), ortho‐xylene (С₆Н₅–(СН₃)₂), and petroleum solvent nefras S2 80/120 [mixture of light hydrocarbons with boiling temperature ranging between 33°C and 205°C]) were studied in the range of wavelength 200–700 nm. The pressure...

article

Chondrichthyan spines from the Famennian (Upper Devonian) of Russia

Oleg A. Lebedev, Alexander O. Ivanov, Valeriy V. Linkevich

Acta Geologica Polonica > 2020 > Vol. 70, no. 3 > 339--362

Very rare chondrichthyan spines from the Famennian (Upper Devonian) of European Russia are referred here to ctenacanthiforms, euselachians and a chondrichthyan group of uncertain systematic position. Ctenacanthus Agassiz, 1837 is recorded from the lower and middle Famennian of the central and north-western parts of the area. Sculptospina makhlaevi Lebedev gen. et sp. nov. originates from the lower...

article

Porous Anodic Alumina Films Grown on Al(111) Single Crystals

I. V. Roslyakov, D. S. Koshkodaev, V. A. Lebedev, K. S. Napolskii

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques > 2019 > 13 > 5 > 955-961

The microstructure and crystallographic orientation of aluminum have a significant effect on the morphology of porous alumina films grown on the surface of Al by anodizing. Most existing works regarding the regularities of aluminum anodizing consider metal foils as isotropic media. The novelty of this study lies in the characterization of porous alumina coatings formed on aluminum single crystals...

article

Semantic Search Tools Based on Ontological Representations of Documentary Information

N. V. Maksimov, O. L. Golitsina, K. V. Monankov, A. A. Lebedev, more

Automatic Documentation and Mathematical Linguistics > 2019 > 53 > 4 > 167-178

Ontological means of identification and representation of text documents semantics in relation to the problems of interactive information retrieval are considered. The implementations of ontologies operations are presented, which allow forming images of new meanings in the subject area. Taxonomies of relations (paradigmatic and syntagmatic) and entities (polythematic thesaurus of concepts) are used...

article

Electron Diffraction Study of Epitaxial Graphene Structure Grown upon SiC (0001) Thermal Destruction in Ar Atmosphere and in High Vacuum

I. S. Kotousova, S. P. Lebedev, A. A. Lebedev, P. V. Bulat

Physics of the Solid State > 2019 > 61 > 10 > 1940-1946

We have studied the structure of epitaxial graphene obtained as a result of thermal desorption of the silicon carbide surface under conditions of vacuum synthesis and in Ar medium by reflection electron diffraction. As a result of the study, a significantly more uniform buffer layer coating of the SiC surface by epitaxial graphene has been found when forming in inert medium on the surface of 4H- and...

article

Coulomb Electron Interaction between an Adsorbate and Substrate: a Model of a Surface Dimer

S. Yu. Davydov, A. V. Zubov, A. A. Lebedev

Technical Physics Letters > 2019 > 45 > 9 > 924-926

The Coulomb interaction in the adsorption (adsorbate—substrate) system is reduced to a short-range repulsion between electrons of the adsorbed particle and atom of the substrate, which form a surface dimer. It is shown that allowance for this interaction leads to increased charge transfer between components of the dimer and decreased charge transfer between the dimer and metal substrate, which is...

article

Impact of High-Energy Electron Irradiation on Surge Currents in 4H-SiC JBS Schottky Diodes

A. A. Lebedev, V. V. Kozlovski, P. A. Ivanov, M. E. Levinshtein, more

Semiconductors > 2019 > 53 > 10 > 1409-1413

The effect of irradiation with high-energy (0.9 MeV) electrons on surge currents in high-voltage (operating voltage 1700 V) 4H -SiC Schottky p-n diodes is studied in the microsecond range of the forward-current pulse duration. With increasing irradiation dose Φ, the hole injection threshold steadily grows, and the base-modulation level by minority carriers (holes) becomes lower. At Φ = 1.5 × 10¹⁶...

article

On the Mechanism of the Population of the $${{{\text{H}}}_{2}}\left( {{{d}^{3}}{{\Pi }_{u}}} \right)$$ State in Nonequilibrium Hydrogen Plasma

Yu. A. Lebedev, V. A. Shakhatov

High Temperature > 2019 > 57 > 4 > 458-461

The stationary concentration method is used to study the mechanism of population of the hydrogen $${{{\text{H}}}_{2}}\left( {{{d}^{3}}{{\Pi }_{u}}} \right)$$ state in a low-pressure nonequilibrium plasma in a DC glow discharge and a microwave discharge. This state is used in plasma diagnostics based on the emission of Fulcher system bands. The limits of the applicability of the coronal model for...

article

Volumetric Reduction of the FeCl₂–CaCl₂ Melt by Calcium Dissolved in Calcium Chloride

V. V. Polyakov, A. V. Babin, V. A. Lebedev

Russian Journal of Non-Ferrous Metals > 2019 > 60 > 4 > 408-412

The purpose of this study is to fabricate highly dispersed powder suitable for spheroidization with further application in additive technologies. The volumetric reduction of the FeCl₂–CaCl₂ melt by calcium dissolved in CaCl₂ produced a fine iron powder. The process included three states, notably, the preparation of melts containing FeCl₂ and Ca, their mixing, and high-temperature aging at 800°C for...

article

Gas temperature in the microwave discharge in liquid n-heptane with argon bubbling

Yuri A. Lebedev, Viatcheslav A. Shakhatov

The European Physical Journal D > 2019 > 73 > 8 > 1-6

Measurement and simulation of the Swan bands’ emission of the atmospheric pressure microwave discharge in liquid n-heptane with and without argon bubbling were carried out. Rotational and vibrational temperature of C₂(d³Π_g) state are determined. It is shown that the bubbling of argon does not change the rotational temperature. The reasons for the unchanged temperature and the possibility of using...

article

Main Gaseous Products of Microwave Discharge in Various Liquid Hydrocarbons

K. A. Averin, Yu. A. Lebedev, A. V. Tatarinov

High Energy Chemistry > 2019 > 53 > 4 > 331-335

Main gaseous products (H₂, C₂H₂, C₂H₄, CH₄) formed by microwave discharge in a number of liquid alkanes, cycloalkanes, and aromatic hydrocarbons have been studied using gas chromatography. It has been shown that the products of the discharge in these cycloalkanes and aromatic compounds bearing no side groups almost do not contain methane or ethylene, unlike the case of alkanes.

article

Cobalt Intercalation of Graphene on Silicon Carbide

G. S. Grebenyuk, E. Yu. Lobanova, D. A. Smirnov, I. A. Eliseev, more

Physics of the Solid State > 2019 > 61 > 7 > 1316-1326

In this paper, we studied cobalt intercalation of single-layer graphene grown on the 4H-SiC(0001) polytype. The experiments were carried out in situ under ultrahigh vacuum conditions by high energy resolution photoelectron spectroscopy using synchrotron radiation and low energy electron diffraction. The nominal thicknesses of the deposited cobalt layers varied in the range of 0.2–5 nm, while the sample...

article

A Study of the Influence Exerted by Structural Defects on Photoluminescence Spectra in n-3C-SiC

A. A. Lebedev, I. P. Nikitina, N. V. Seredova, N. K. Poletaev, more

Technical Physics Letters > 2019 > 45 > 6 > 557-559

Photoluminescence (PL) spectra have been studied in 3C-SiC/4H-SiC heterostructures and 3C‑SiC single crystals. It was shown that epitaxial 3C-SiC layers grown on 4H-SiC substrates have a markedly poorer crystal perfection than do 3C-SiC single crystals. It was found that doping with aluminum gives rise to a characteristic PL both in epitaxial layers and in 3C-SiC single crystals. At the same time,...

article

Low-Temperature Annealing of Lightly Doped n-4H-SiC Layers after Irradiation with Fast Electrons

O. M. Korolkov, V. V. Kozlovski, A. A. Lebedev, N. Sleptsuk, more

Semiconductors > 2019 > 53 > 7 > 975-978

The effect of low-temperature (up to 600°C) isothermal and isochronous annealing on the electrical characteristics of irradiated n-4H-SiC JBS Schottky diodes is studied. Irradiation is performed with 0.9-MeV electrons at a dose of 1 × 10¹⁶ cm^–2. It is shown that the forward current–voltage (I–V) and capacitance–voltage (C–V) characteristics of the irradiated diodes are mainly restored at annealing...

article

The Origin of Adakite-Like Magmas in the Modern Continental Collision Zone: Evidence from Pliocene Dacitic Volcanism of the Akhalkalaki Lava Plateau (Javakheti Highland, Lesser Caucasus)

V. A. Lebedev, G. T. Vashakidze, A. V. Parfenov, A. I. Yakushev

Petrology > 2019 > 27 > 3 > 307-327

The paper reports the isotope-geochronological and petrological-geochemical studies of the Pliocene moderately-acid volcanism of the Akhalkalaki Plateau in the central part of the Lesser Caucasus (Javakheti highland, Georgia). K-Ar dating showed that young dacitic lavas and pyroclastic rocks were formed in the mid-Pliocene (3.28 ± 0.10 Ma) in relation with the explosive–effusive eruptions of small...

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Search results for: A. Lebedev

Time resolved study of ignition of microwave discharge in liquid hydrocarbons

Influence of Composition on Energetic Properties of Copper Oxide – Aluminum Powder Nanothermite Materials Formed by Electrophoretic Deposition

Thermal performance of an accumulator unit using phase change material with a fixed volume of fins

Light emission from microwave discharges in liquid hydrocarbons at the initial stages of their development

Raman spectroscopy of human skin for kidney failure detection

Optical emission spectra of microwave discharge in different liquid hydrocarbons

Chondrichthyan spines from the Famennian (Upper Devonian) of Russia

Porous Anodic Alumina Films Grown on Al(111) Single Crystals

Semantic Search Tools Based on Ontological Representations of Documentary Information

Electron Diffraction Study of Epitaxial Graphene Structure Grown upon SiC (0001) Thermal Destruction in Ar Atmosphere and in High Vacuum

Coulomb Electron Interaction between an Adsorbate and Substrate: a Model of a Surface Dimer

Impact of High-Energy Electron Irradiation on Surge Currents in 4H-SiC JBS Schottky Diodes

On the Mechanism of the Population of the $${{{\text{H}}}_{2}}\left( {{{d}^{3}}{{\Pi }_{u}}} \right)$$ State in Nonequilibrium Hydrogen Plasma

Volumetric Reduction of the FeCl₂–CaCl₂ Melt by Calcium Dissolved in Calcium Chloride

Gas temperature in the microwave discharge in liquid n-heptane with argon bubbling

Main Gaseous Products of Microwave Discharge in Various Liquid Hydrocarbons

Cobalt Intercalation of Graphene on Silicon Carbide

A Study of the Influence Exerted by Structural Defects on Photoluminescence Spectra in n-3C-SiC

Low-Temperature Annealing of Lightly Doped n-4H-SiC Layers after Irradiation with Fast Electrons

The Origin of Adakite-Like Magmas in the Modern Continental Collision Zone: Evidence from Pliocene Dacitic Volcanism of the Akhalkalaki Lava Plateau (Javakheti Highland, Lesser Caucasus)

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