Перегляд за автором "Tkachenko, V.I."

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Accumulation and confinement of electrons in a penning trap with a central electrode

Man’kovsky, S.N.; Sytnykov, D.A.; Tarasov, I.K.; Tkachenko, I.V.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2006)

In this work results of experimental and theoretical research of electron accumulation at the injection of a tubular electron beam with strong spread over velocities in a Penning trap with a central electrode are presented.
A dispersion equation of the cylindrical ideal wall vacuum cavity sinusoidally corrugated in azimuthal direction. Part I. A physically based method obtaining of the dispersion equation

Maksimenko, A.V.; Tkachenko, V.I.; Tkachenko, I.V. (Вопросы атомной науки и техники, 2017)

Dispersive characteristics of a cylindrical cavity with an ideally conducting outer wall has been investigated, whose radius is described by a sinusoidal-periodic dependence on the azimuth angle. From the convergence of ...
A dispersion equation of the cylindrical ideal wall vacuum cavity sinusoidally corrugated in azimuthal direction. Part II. Investigation of the dispersion equation

Maksimenko, A.V.; Tkachenko, V.I.; Tkachenko, I.V. (Вопросы атомной науки и техники, 2018)

Dispersion equation of a cylindrical cavity with an ideally conducting outer wall has been investigated, whose radius is described by a sinusoidal-periodic dependence on the azimuth angle. Numerically and analytically it ...
A fractal accelerator on the basis of a corrugated plasma waveguide with superconducting walls

Tkachenko, I.V.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2019)

The use of a two-stage mechanism for the acceleration of charged particles is proposed. The principle of acceleration is based on the use of the fractal properties of the wave spectrum of a corrugated plasma waveguide with ...
A similarity criterion for spherical fuel elements free fall velocity in cylindrical channels with viscous liquid

Andrieieva, O.L.; Bulavin, L.A.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2021)

The introduction of nuclear high-temperature gas-cooled reactors (HTGR) with an active zone based on spherical fuel elements (SFE) poses the task of determining the velocity of their free fall in cylindrical channels with ...
Cavity with distributed dielectric coating for subterahertz second-harmonic gyrotron

Shcherbinin, V.I.; Zaginaylov, G.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2016)

Metallic cavity with distributed dielectric coating for the 0.4 THz second harmonic gyrotron is proposed and studied using the generalized scattering matrix approach. It is shown that such coating provides several-fold ...
Deuteron-deuteron nucleosynthesis considered with accounting of centrifugal and coulomb barriers

Tkachenko, I.V.; Trubnikov, S.V.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2017)

The basic analysis of nuclear reactions in the deuteron-deuteron (dd) system at low energies is carried out. For the case of nuclear dd-fusion special attention is paid to the difference in the height of the Coulomb barriers, ...
Direct martensitic transformations of low-carbon steels

Belykh, D.G.; Skoromna, S.F.; Tkachenko, V.I. (Problems of Atomic Science and Technology, 2023)

The proposed model is based on the use of the principle of detailed equilibrium, which occurs during phase transitions of the crystal lattice. This theory complements the theory of Landau phase transitions in crystalline ...
Dispersion properties of arbitrary cross-section plasma-filled waveguide in a finite magnetic field

Shcherbinin, V.I.; Zaginaylov, G.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2013)

The study presents a universal approach to solving a boundary value problem for waveguide of arbitrary crosssection with longitudinally magnetized plasma filling. The approach utilizes representation of longitudinal fields ...
Efficient approach to analysis of TM modes in coaxial gyrotron cavity with corrugated insert

Tkachova, T.I.; Shcherbinin, V.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2018)

Electromagnetic characteristics of TM modes of a coaxial gyrotron cavity with a corrugated inner conductor are investigated. Coupled-mode method based on re-expansion of the cavity fields in terms of the Gegenbauer ...
Eigenvalues and eigenfields of a corrugated gyrotron cavity with conducting walls

Tkachova, T.I.; Shcherbinin, V.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2018)

Electromagnetic analysis of a cylindrical gyrotron cavity with longitudinal wall corrugations is performed on the basis of the approximate surface impedance model (SIM) and the full-wave spatial harmonic method (SHM). ...
Electromagnetic wave model of hydrogen and helium distribution at the formation of the solar system

Andrieieva, O.L.; Tkachenko, V.I.; Tkachenko, G.A. (Problems of Atomic Science and Technology, 2023)

This paper considers the formation process of the protosolar hydrogen-helium cloud in chronological order. From the list of hypotheses about the solar system formation, the electromagnetic hypothesis of Alfvén was selected ...
Exponential dichotomy and existence of almost periodic solutions of impulsive differential equations

Tkachenko, V.I. (Нелінійні коливання, 2014)

We obtain conditions for existence of piecewise continuous almost periodic solutions of a system of impulsive differential equations with exponentially dichotomous linear part. The robustness of exponential dichotomy and ...
Formation of nanoclusters in the transition of carbon dioxide to the supercritical state

Borts, B.V.; Skoromnaya, S.F.; Tkachenko, I.V.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2022)

Supercritical fluid extraction (SFE) with CO₂ is widely used to extract biological materials, metal complexes and their isotopes. Supercritical CO₂ (SC-CO₂) is an environmentally friendly, efficient, and affordable solvent. ...
Formation of step density shock waves on vicinal NaCl(100) growth surfaces

Kulyk, O.P.; Podshyvalova, O.V.; Andrieieva, O.L.; Tkachenko, V.I.; Gnatyuk, V.A.; Aoki, T. (Вопросы атомной науки и техники, 2022)

The morphology of the growth surface near NaCl(100), formed during the pore motion in a crystal due to the temperature gradient, has been studied by the electron microscopic method of vacuum decoration. It is shown that ...
Fractal properties of dispersion characteristics of sinusoidally rippled plasma waveguide

Lapshyn, V.I.; Stoyanov, A.F.; Tkachenko, V.I.; Tkachenko, I.V. (Вопросы атомной науки и техники, 2005)

Features of the solution of Maxwell’s equations in sinusoidally rippled waveguide with the metal walls, filled with cold plasma, are considered. The dispersion equation which gives connection between longitudinal wave ...
Fractal properties of periodic plasma waveguides

Lapshyn, V.I.; Zaginaylov, G.I.; Tkachenko, V.I.; Tkachenko, I.V. (Вопросы атомной науки и техники, 2001)

Fractal properties of periodic plasma waveguides are investigated in this article. It's shown that the Hausdorff dimension of model dispersion law is dH=1/2 and for the Trivelpicec-Gould waves dH=1/3. These values indicete ...
HE- and EH-hybrid waves in a circular dielectric waveguide with an anisotropic impedance surface

Shcherbinin, V.I.; Zaginaylov, G.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2015)

The boundary-value problem for a circular dielectric waveguide with an anisotropic impedance boundary is reduced to two independent problems. Thus the hybrid waves of different types are shown to be uncoupled in such ...
High-temperature oxidation of nuclear graphite with account of movement of the surface layer of oxidator

Komir, A.I.; Odeychuk, N.P.; Tkachenko, V.I.; Ulybkin, A.L.; Nikolaenko, A.A. (Вопросы атомной науки и техники, 2018)

At high-temperature oxidation of nuclear graphite, the oxidant flow in the near-surface region is taken into account. Macro- and microscopic modeling of the oxidation of the near-surface layer was carried out. The calculation ...
Mode selection by ohmic losses in longitudinally corrugated cavities of sub-THz second-harmonic gyrotrons

Tkachova, T.I.; Shcherbinin, V.I.; Tkachenko, V.I. (Вопросы атомной науки и техники, 2019)

Ohmic wall losses are proposed as a means for improving the mode selection in a cylindrical gyrotron cavity with longitudinal wedge-shaped corrugations. Such losses depend on mode frequency and geometrical parameters of ...

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