Search results for: A. N. Smirnov

Items from 1 to 20 out of 132 results

article

Boson Peak Related to Ga Nanoclusters in AlGaN Layers Grown by Plasma-Assisted Molecular Beam Epitaxy at Ga-Rich Conditions

V. Yu. Davydov, V. N. Jmerik, E. M. Roginskii, Yu. E. Kitaev, more

Semiconductors > 2019 > 53 > 11 > 1479-1488

We report the results of systematic Raman spectroscopy studies of Al_xGa_{1 –}_xN (x ~ 0.75) layers grown using plasma-assisted molecular beam epitaxy at various stoichiometric conditions and growth fluxes. The high-intensity asymmetric low-frequency peak obeying Bose statistics is discovered in Raman spectra of the layers grown by temperature-modulated epitaxy at strongly Ga-enriched conditions. Theoretical...

article

Influence of the Reduction in the First Matched Groove Pair of a Three-High Stand on Billet Damage

E. N. Smirnov, A. N. Smirnov, V. A. Sklyar, V. V. Mikheev, more

Steel in Translation > 2019 > 49 > 5 > 332-338

The influence of the one-time reduction in the first pair of matched grooves in a three-high stand on the cracking at the end of the billet is simulated. The traditional six-pass procedure in the three-high stand is compared with the new six-pass procedure and the eight-pass procedure proposed in the present work. The comparison shows that, by milder reduction in the first pair of matched grooves,...

article

Improved Coal Flotation with Sinterol Modifier

V. N. Petukhov, A. N. Smirnov, T. G. Voloshchuk, N. Y. Svechnikova, more

Coke and Chemistry > 2019 > 62 > 4 > 121-127

The flotation of coal with different ash content when using Sinterol modifier is studied. If the modifier consumption is 1.0–3.0 g/t of coal fines, the extraction of the coal’s combustible mass in the concentrate is increased; the selectivity of the process is increased; and the loss of the coal’s organic mass with the flotation wastes is decreased. The improved flotation may be explained as follows...

article

Molecular-Beam Epitaxy of Two-Dimensional GaSe Layers on GaAs(001) and GaAs(112) Substrates: Structural and Optical Properties

S. V. Sorokin, P. S. Avdienko, I. V. Sedova, D. A. Kirilenko, more

Semiconductors > 2019 > 53 > 8 > 1131-1137

The results of studies of the structural and optical properties of two-dimensional GaSe layers grown by molecular-beam epitaxy on GaAs(001) and GaAs(112) substrates using a valve cracking cell for the Se source are reported. The influence of the MBE growth parameters (the substrate temperature, Ga flux intensity, Se/Ga incident flux ratio) on the surface morphology of the layers is studied. By means...

article

Template Synthesis of Monodisperse Submicrometer Spherical Nanoporous Silicon Particles

D. A. Kurdyukov, N. A. Feoktistov, D. A. Kirilenko, A. N. Smirnov, more

Semiconductors > 2019 > 53 > 8 > 1048-1053

Monodisperse spherical nanoporous silicon (np-Si) particles of submicrometer size are fabricated with mesoporous silica particles as a template. Silicon is synthesized within the mesopores of monodisperse silica particles by the thermal decomposition of monosilane. Then, the template material (a-SiO₂) is removed by wet etching. The particles obtained have a small root-mean-square size scatter (no...

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

Diversity of Harpin-Like Defense Peptides from Barnyard Grass (Echinochloa crusgalli L.) Seeds

D. Yu. Ryazantsev, E. A. Rogozhin, V. O. Tsvetkov, L. G. Yarullina, more

Doklady Biochemistry and Biophysics > 2019 > 484 > 1 > 6-8

The results of the study of the structure and function of harpin-like peptides (alpha-harpinins) of the EcAMP group from the barnyard grass (E. crusgalli) seeds and the possibility of their involvement in the innate immunity to biotic stresses are presented.

article

Formation of Highly Conducting Optically Transparent Films with Multigraphene Structure via Carbonization of Polyimide Langmuir–Blodgett Films

S. I. Goloudina, V. V. Luchinin, V. M. Pasyuta, A. N. Smirnov, more

Technical Physics Letters > 2019 > 45 > 5 > 471-474

Multigraphene films have been for the first time obtained on the surface of quartz glass via carbonization of polyimide Langmuir–Blodgett films. The Raman spectra of the films show bands G and D and a broad band at 2300–3200 cm^–1, which are characteristic of graphite-like films. The transmission electron microscopy demonstrated that the films are constituted by “stacks” of layers spaced by 0.36 nm...

article

Effect of Heat Treatment in a СF₄ Atmosphere on the Ion-Conductive Properties of Hot-Pressed 95 mol % CeF₃ × 5 mol % SrF₂ Ceramics

N. I. Sorokin, D. N. Karimov, A. N. Smirnov, B. P. Sobolev

Crystallography Reports > 2019 > 64 > 1 > 105-109

X-ray and electrophysical investigations of ceramics with a charge composition 95 mol % CeF₃ × 5 mol % SrF₂ synthesized by hot pressing of CeF₃ and SrF₂ powders (300 MPa, 900°С, 20 min) in vacuum and the same ceramics annealed in a fluorinating atmosphere (CF₄, 1000°С, 180 min) have been carried out. The initial two-phase ceramics consists of the tysonite phase (a = 7.130(1) Å, c = 7.295(1) Å) and...

article

Study of CsPbBr₃ Nanocrystals and Their Agglomerates by Combined Scanning Probe Microscopy and Optical Spectrometry

P. A. Dement’ev, M. S. Dunaevskii, L. B. Matyushkin, A. V. Nezhdanov, more

Optics and Spectroscopy > 2018 > 125 > 6 > 858-863

The electric, piezoelectric, and optical properties of colloidally synthesized CsPbBr₃ nanocrystals (NCs) are studied by combined scanning probe microscopy and optical spectrometry. It is found that the CsPbBr₃ NCs have a cubic shape with an edge length of 10 nm. When deposited on a substrate, these NCs gather into faceted agglomerates up to several hundred nanometers in size. It is shown that the...

article

High Quality Graphene Grown by Sublimation on 4H-SiC (0001)

A. A. Lebedev, V. Yu. Davydov, D. Yu. Usachov, S. P. Lebedev, more

Semiconductors > 2018 > 52 > 14 > 1882-1885

The structural and electronic characteristics of epitaxial graphene films grown by thermal decomposition of the Si face of a semi-insulating 4H-SiC substrate in an argon environment have been studied by a large set of analytical techniques. It is shown that the results of a complex study make it possible to optimize the growth parameters and develop a reliable technology for the growth of high-quality...

article

Rotary Furnace for Comparative Evaluation of Heating Unit Refractory Object Erosion Resistance

A. N. Smirnov, G. G. Nemsadze, K. N. Sharandin, A. F. Tonkushin, more

Refractories and Industrial Ceramics > 2018 > 59 > 2 > 227-230

Results are presented for comparative tests of refractory concretes in a rotary type laboratory furnace by means of which it is possible to model conditions actually existing during heating unit operation. This in turn makes it possible to provide an objective prediction of the efficiency of using different refractories as lining material for one or another heating unit. In addition it is possible...

article

Effects of Decreasing the Initial Rolling Temperature in Three-High Roughing Stands

E. N. Smirnov, A. N. Smirnov, V. A. Sklyar, V. A. Belevitin, more

Steel in Translation > 2018 > 48 > 6 > 381-387

Research on expanding the product range and minimizing the energy costs at a linear medium-bar mill with three-high roughing stands is discussed. The possibility of controlling the mechanical properties of the product by decreasing the initial rolling temperature is considered. Despite the improvement in mechanical properties, decrease in the initial rolling temperature in the range 900–950°C is accompanied...

article

System for Continuous Analytical Control of Burden Materials for the Production of High-Quality Sinter

A. V. Masalimov, A. N. Smirnov, A. I. Volkov

Metallurgist > 2018 > 62 > 5-6 > 412-417

The capabilities of analytical control systems and their applicability in sinter production are considered. Industrial experiments showed that continuous control of the chemical composition of the components of sinter burden can improve the quality of sinter and save up to 8 kg of limestone and 1 kg of coke per ton of sinter produced.

article

Template Synthesis of Monodisperse Spherical Nanocomposite SiO₂/GaN:Eu³⁺ Particles

E. Yu. Stovpiaga, D. A. Eurov, D. A. Kurdyukov, A. N. Smirnov, more

Semiconductors > 2018 > 52 > 9 > 1123-1128

A nanocomposite in the form of monodisperse spherical mesoporous silica particles (mSiO₂) filled with GaN:Eu³⁺ is synthesized by the template method. The method is based on the capillary impregnation of pores of mSiO₂ particles with a melt of crystal hydrates of gallium and europium (0.22 wt %) nitrates, followed by thermal decomposition and ammonia treatment. It is shown that nanocomposite particles...

article

Producing Structural-Steel Bar from Continuous-Cast Billet

A. N. Smirnov, E. N. Smirnov, V. A. Sklyar, V. A. Belevitin, more

Steel in Translation > 2018 > 48 > 4 > 233-239

The expanded use of continuous-cast billet in the production of structural-steel bar is considered. The quality of 135 × 135 mm continuous-cast billet produced on a standard continuous-casting machine and the bar derived from it is evaluated. At more recently built plants, the production of quality bar from continuous- cast billet requires total extension of the order of 6–7. On the basis of the analysis...

article

Intercalation of Iron Atoms under Graphene Formed on Silicon Carbide

M. V. Gomoyunova, G. S. Grebenyuk, V. Yu. Davydov, I. A. Ermakov, more

Physics of the Solid State > 2018 > 60 > 7 > 1439-1446

The intercalation of iron under a graphene monolayer grown on 4H-SiC(0001) is studied. The experiments have been carried out in situ under conditions of ultrahigh vacuum by low-energy electron diffraction, high-energy-resolution photoelectron spectroscopy using synchrotron radiation, and near carbon K-edge X-ray absorption spectroscopy. The deposited iron film thicknesses have been varied within 0...

article

Local Anodic Oxidation of Graphene Layers on SiC

P. A. Alekseev, B. R. Borodin, M. S. Dunaevskii, A. N. Smirnov, more

Technical Physics Letters > 2018 > 44 > 5 > 381-383

A method of local anodic oxidation has been used to obtain graphene-oxide regions on SiC. The change of the surface properties was confirmed by atomic-force microscopy and Raman spectroscopy. Experimental data were obtained on the conductivity, potential, and topography of the oxidized regions. It was shown that the oxidation leads to a rise in the surface potential. A relationship was found between...

article

Luders Deformation in Weld Joints

V. I. Danilov, A. N. Smirnov, V. V. Gorbatenko, D. V. Orlova, more

Steel in Translation > 2018 > 48 > 2 > 87-92

The elastoplastic transition in welded low-carbon steel samples is considered. Two methods of manual arc welding of floating-electrode type are employed: a traditional steady arc; and pulsed welding with controlled heat consumption. In terms of the structural characteristics and mechanical properties of the welded metal, the methods are identical. In both cases, extended elastoplastic transition by...

article

Analysis of Intermolecular Complexes of Coal’s Organic Mass in the Search for Composite Flotation Reagents

V. N. Petukhov, A. N. Smirnov, T. G. Voloshchuk, D. A. Kubak

Coke and Chemistry > 2018 > 61 > 2 > 64-71

Cyclic oxygen-bearing compounds and products of petroleum processing are considered as potential composite reagents. In searching for highly effective composite reagents differing in structure and elementary composition, one possible criterion is the energy of the hydrogen bond in intermolecular complexes between the reagent and the coal’s organic mass. The hydrogen-bond energy in intermolecular complexes...

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Search results for: A. N. Smirnov

Boson Peak Related to Ga Nanoclusters in AlGaN Layers Grown by Plasma-Assisted Molecular Beam Epitaxy at Ga-Rich Conditions

Influence of the Reduction in the First Matched Groove Pair of a Three-High Stand on Billet Damage

Improved Coal Flotation with Sinterol Modifier

Molecular-Beam Epitaxy of Two-Dimensional GaSe Layers on GaAs(001) and GaAs(112) Substrates: Structural and Optical Properties

Template Synthesis of Monodisperse Submicrometer Spherical Nanoporous Silicon Particles

Cobalt Intercalation of Graphene on Silicon Carbide

Diversity of Harpin-Like Defense Peptides from Barnyard Grass (Echinochloa crusgalli L.) Seeds

Formation of Highly Conducting Optically Transparent Films with Multigraphene Structure via Carbonization of Polyimide Langmuir–Blodgett Films

Effect of Heat Treatment in a СF₄ Atmosphere on the Ion-Conductive Properties of Hot-Pressed 95 mol % CeF₃ × 5 mol % SrF₂ Ceramics

Study of CsPbBr₃ Nanocrystals and Their Agglomerates by Combined Scanning Probe Microscopy and Optical Spectrometry

High Quality Graphene Grown by Sublimation on 4H-SiC (0001)

Rotary Furnace for Comparative Evaluation of Heating Unit Refractory Object Erosion Resistance

Effects of Decreasing the Initial Rolling Temperature in Three-High Roughing Stands

System for Continuous Analytical Control of Burden Materials for the Production of High-Quality Sinter

Template Synthesis of Monodisperse Spherical Nanocomposite SiO₂/GaN:Eu³⁺ Particles

Producing Structural-Steel Bar from Continuous-Cast Billet

Intercalation of Iron Atoms under Graphene Formed on Silicon Carbide

Local Anodic Oxidation of Graphene Layers on SiC

Luders Deformation in Weld Joints

Analysis of Intermolecular Complexes of Coal’s Organic Mass in the Search for Composite Flotation Reagents

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