Search results for: A A Goncharov

Items from 1 to 20 out of 34 results

article

Comparative Analysis of the Effect of RF and DC Magnetron Sputtering Parameters on the Structure Formation of Tantalum-Diboride Thin Films

A. A. Goncharov, A. N. Yunda, A. I. Bazhin, I. V. Shelest, more

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques > 2018 > 12 > 3 > 544-548

A comparative analysis of the effect of magnetron-sputtering parameters on the formation of the structure of thin tantalum-diboride films deposited using a radio-frequency magnetron sputtering system and a sputtering system with an unbalanced direct-current magnetron is carried out. The sign and magnitude of the bias voltage is shown to significantly affect the structure of tantalum-diboride films.

chapter

Modes of plasma-dynamical system with closed electron drift and open walls

A. A. Goncharov, A. N. Dobrovolskiy, I. V. Naiko, L. V. Naiko, more

2017 IEEE International Young Scientists Forum on Applied Physics and Engineering (YSF) > 267 - 270

2017 IEEE International Young Scientists Forum on Applied Physics and Engineering (YSF)

The research results of a plasma accelerator which includes a cross electromagnetic field and open walls were considered. For this system, theoretical calculations for the dynamics of ions and electrons were conducted. It was established that a one-dimensional hydrodynamic model, according to the principles of equipotentialization of field lines, well describes experimental data. It was shown that...

chapter

Effect of DC magnetron sputtering parameters on the structure, composition and tribological properties of tantalum diboride films

A. D. Pogrebnjak, A. A. Goncharov, A. N. Yunda, I. V. Shelest, more

2017 IEEE 7th International Conference Nanomaterials: Application & Properties (NAP) > 1PCSI36-1 - 1PCSI36-4

2017 IEEE 7th International Conference Nanomaterials: Application & Properties (NAP)

Tantalum diboride films were deposited on stainless steel substrates using a direct current magnetron sputtering system under various sputtering conditions. X-ray diffraction analysis of the samples was carried out. Study of the coatings composition in depth was carried out using Rutherford backscattering and secondary ion mass spectrometry methods. The friction coefficient and wear of the coatings...

chapter

Structural identification of soft-sensor of MTBE unit

S. A. Samotylova, A. Yu. Torgashov, A. A. Goncharov

2017 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) > 1 - 5

2017 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM)

The paper deals with the task of estimating methanol concentration in the process of methyl-tert-butyl ether production by soft-sensor. A comparative analysis of the methods for determining of the main informative input sets for the soft-sensor model is presented. The dynamic soft sensor modeling based on the use of convolution sums in order to take into account the time of measurement delay is used...

chapter

Modelling of thermal processes in the cutting insert with a protective coating

A. A. Goncharov, A. N. Yunda, R. Yu. Bondarenko, S. A. Goncharova, more

2016 International Conference on Nanomaterials: Application & Properties (NAP) > 2NEA6-1 - 2NEA6-4

2016 International Conference on Nanomaterials: Application & Properties (NAP)

A mathematical model of the temperature distribution in the cutting insert at cutting was developed. The thermal field in the cutting insert coated by protective film was modeled using numerical methods for various boundary conditions. The numerical solution of the heat equation with the given boundary conditions and conjugation conditions at the interface between the protective film (HfB₂) and hardalloyed...

chapter

Space charge plasma optic devices: New applications in vacuum arc technology

E. M. Oks, V. I. Gushenets, A. S. Bugaev, A. A. Goncharov, more

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) > 2 > 1 - 4

2016 27th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

This is a brief review of last results of ongoing research of the new generation plasma optic devices on base of wide aperture cylindrical electrostatic plasma lens, that open up novel possibility for effective practical applications in modern high-tech. The most attractive new applications are removing microparticles from vacuum arc plasma stream as well as focusing large-area intensive electron...

chapter

Effect of magnetron sputtering (RF and DC) parameters on the TaB₂ films structure

A. A. Goncharov, A. V. Zykov, I. V. Shelest, A. N. Yunda, more

2016 International Conference on Nanomaterials: Application & Properties (NAP) > 1PCSI8-1 - 1PCSI8-4

2016 International Conference on Nanomaterials: Application & Properties (NAP)

Effect of bias potential applied to substrate on the structure of tantalum diboride films deposited by nonreactive RF-magnetron and unbalanced magnetron at direct current (DC) sputtering of TaB₂ target in argon was investigated. It was shown that for both processes the value of the bias potential applied to the substrate is crucial to the films structure formation, which determines respectively their...

article

Consumption of aquatic subsidies by soil invertebrates in coastal ecosystems

D. I. Korobushkin, A. Y. Korotkevich, A. A. Kolesnikova, A. A. Goncharov, more

Contemporary Problems of Ecology > 2016 > 9 > 4 > 396-406

Routes of aquatic allochthonous inputs (aquatic subsidies) to detrital food webs are studied, as is the effect of aquatic subsidies on the functional and taxonomic structure of soil invertebrate communities in coastal ecosystems. The study took place in the coastal zone of an oxbow lake of the Pra River in the Oka Reserve. The results indicate a strong dependence of soil animals in the coastal habitats...

article

Superhardness effect in transition-metal diborides films

A. I. Bazhin, A. A. Goncharov, A. D. Pogrebnyak, V. A. Stupak, more

The Physics of Metals and Metallography > 2016 > 117 > 6 > 594-601

The structure, composition, and properties of transition-metal diboride films have been studied. It was shown that they are characterized by a wide range of structural states, namely from amorphous-like to nanocrystalline with crystallite sizes of 1–50 nm. The characteristic peculiarity of the structure of film transition-metal diborides with high physical and mechanical properties is the formation...

article

Self-braking of free-wheel mechanisms

A. A. Goncharov, An. A. Goncharov

Russian Engineering Research > 2016 > 36 > 5 > 339-344

Static self-braking of wedge-based free-wheel mechanisms is investigated by means of a nonconservative boundary-element model. The distribution of the contact characteristics in the kinematic pairs of the self-braking mechanisms is established. Their stress–strain state is determined.

article

Modelling of new generation plasma optical devices

I. V. Litovko, A. A. Goncharov, A. N. Dobrovolskiy, L. V. Naiko, more

Nukleonika > 2016 > Vol. 61, No. 2 > 207--212

The paper presents new generation plasma optical devices based on the electrostatic plasma lens configuration that opens a novel attractive possibility for effective high-tech practical applications. Original approaches to use of plasma accelerators with closed electron drift and open walls for the creation of a cost- -effective low-maintenance plasma lens with positive space charge and possible application...

article

Intra-body variation and ontogenetic changes in the isotopic composition (¹³C/¹²C and ¹⁵N/¹⁴N) of beetles (Coleoptera)

S. M. Tsurikov, A. A. Goncharov, A. V. Tiunov

Entomological Review > 2015 > 95 > 3 > 326-333

Stable isotope analysis, which is widely used for studying trophic relationships of invertebrates, requires a correct estimation of trophic fractionation factors as well as the proper choice of reference tissues. Different organs and body parts of large insects may vary in the isotopic composition of carbon (δ¹³C) and nitrogen (δ¹⁵N), though detailed information is available for a limited set of species...

article

Reproductively isolated ecotypes of killer whales Orcinus orca in the seas of the Russian Far East

O. A. Filatova, E. A. Borisova, O. V. Shpak, I. G. Meschersky, more

Biology Bulletin > 2015 > 42 > 7 > 674-681

Two ecotypes of killer whales—fish-eating and mammal-eating—have been found in the seas of the Russian Far East, but confirmation of their status required genetic studies of animals with known phenotype and foraging specialization. In this paper we combine the results of the analysis of nuclear genetic markers, isotopic composition of tissues and phenetic feature (shape of the saddle patch) of killer...

article

Structure, composition, and mechanical properties of thin films of transition metals diborides

A. A. Goncharov, S. N. Dub, A. V. Agulov, V. V. Petukhov

Journal of Superhard Materials > 2015 > 37 > 6 > 422-428

The effect of the deposition conditions on the structure, composition, and mechanical properties of thin films of diborides of transition metals that have been produced by high frequency magnetron sputtering. It has been shown that depending on the applied bias voltage and substrate temperature coatings of various structures are formed: from amorphous-like to nanocrystalline. Under the optimal energy...

chapter

Low energy electron beam transport with a space charge lens

V. I. Gushenets, A. A. Goncharov, A. N. Dobrovolskiy, I. V. Litovko, more

2014 International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) > 553 - 556

2014 International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

Pulsed electron beams with high (1÷100 J/cm2) energy density are used in various processes involved in structural and functional modification of surface properties of materials and products. One of the main problems of successful electron beam application is to develop reliable and efficient methods of transport and manipulation of electron beams with high energy density. The paper presents new experimental...

article

Study of the influence of geometric parameters of elements upon self-locking of free running wedge mechanisms

A. A. Goncharov, An. A. Goncharov

Journal of Machinery Manufacture and Reliability > 2014 > 43 > 1 > 14-21

The active loading of free running wedge mechanisms and the influence of geometric parameters of elements on self-locking are studied using the static nonconservative boundary element model. Relations are derived based on the resulting solutions of the contact problems to connect the geometric settings with the minimal values of sliding friction factors at which the mechanism self-locks.

article

Optical, structural, and photocatalytic properties of the nanosized titanium dioxide films deposited in magnetron discharge plasma

A. A. Goncharov, A. N. Dobrovol’skii, E. G. Kostin, I. S. Petrik, more

Technical Physics > 2014 > 59 > 6 > 884-891

The conditions of the optimum and controlled deposition of titanium dioxide nanolayers in the cylindrical gas discharge plasma of a magnetron having a unique design are found and described. The examination of the grown films by Raman spectroscopy is used to determine the conditions of deposition of the amorphous and polycrystalline phases of titanium dioxide. The films deposited on a cold substrate...

article

Thermal stability of the phase composition and structure of hafnium diboride films

A. V. Agulov, A. A. Goncharov, V. A. Stupak, V. V. Petukhov

Inorganic Materials > 2014 > 50 > 5 > 460-463

The thermal stability of the composition and crystal structure of hafnium diboride films grown by rf magnetron sputtering have been studied by X-ray diffraction and secondary ion mass spectrometry. We have assessed the effect of high-temperature annealing in air on the phase composition and structure of the hafnium diboride films. The results demonstrate that annealing produces a HfO₂ oxide layer...

article

Trophic chains in the soil

A. A. Goncharov, A. V. Tiunov

Biology Bulletin Reviews > 2014 > 4 > 5 > 393-403

The trophic links of soil animals are extensively diverse but also flexible. Moreover, the feeding activity of large soil saprotrophs often cascades into a range of ecosystem-level consequences via the ecological engineering. An improved knowledge of the main sources of energy utilized by soil animals is needed for understanding the functional structure of soil animal communities and their participation...

article

Spatial variations in the trophic structure of soil animal communities in boreal forests of Pechora-Ilych Nature Reserve

A. A. Goncharov, E. Yu. Khramova, A. V. Tiunov

Eurasian Soil Science > 2014 > 47 > 5 > 441-448

Soil animal communities and detrital food webs are spatially compartmentalized. In old-growth boreal forests the dynamics of dominating plant species forms a considerable heterogeneity of edaphic conditions in the soil layer. We demonstrate a strong difference in total and relative abundance of main trophic groups of soil macrofauna in four microsites, i.e. under tree crowns, in gaps, in mounds and...

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Search results for: A A Goncharov

Comparative Analysis of the Effect of RF and DC Magnetron Sputtering Parameters on the Structure Formation of Tantalum-Diboride Thin Films

Modes of plasma-dynamical system with closed electron drift and open walls

Effect of DC magnetron sputtering parameters on the structure, composition and tribological properties of tantalum diboride films

Structural identification of soft-sensor of MTBE unit

Modelling of thermal processes in the cutting insert with a protective coating

Space charge plasma optic devices: New applications in vacuum arc technology

Effect of magnetron sputtering (RF and DC) parameters on the TaB₂ films structure

Consumption of aquatic subsidies by soil invertebrates in coastal ecosystems

Superhardness effect in transition-metal diborides films

Self-braking of free-wheel mechanisms

Modelling of new generation plasma optical devices

Intra-body variation and ontogenetic changes in the isotopic composition (¹³C/¹²C and ¹⁵N/¹⁴N) of beetles (Coleoptera)

Reproductively isolated ecotypes of killer whales Orcinus orca in the seas of the Russian Far East

Structure, composition, and mechanical properties of thin films of transition metals diborides

Low energy electron beam transport with a space charge lens

Study of the influence of geometric parameters of elements upon self-locking of free running wedge mechanisms

Optical, structural, and photocatalytic properties of the nanosized titanium dioxide films deposited in magnetron discharge plasma

Thermal stability of the phase composition and structure of hafnium diboride films

Trophic chains in the soil

Spatial variations in the trophic structure of soil animal communities in boreal forests of Pechora-Ilych Nature Reserve

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