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Wyszukujesz frazę "Tkach, M." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    ZnO films: propeties determined by electronic microscopy and ellipsometry
    Autorzy:
    Rakov, M.
    Poperenko, L.
    Tkach, V.
    Yurgelevich, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/385183.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    reactive magnetron sputtering
    Beattie’s method
    semi-infinite medium
    AFM
    SEM
    nanostructures
    Opis:
    Zinc oxide is a good material for application in nanoand optoelectronics due to its notable features, for example, large band gap. In this work ZnO films deposited by reactive magnetron sputtering at various pressure of residual gases and different temperatures of the substrate are investigated. The spectral dependences of ellipsometric parameters and of the films are determined by ellipsometry. The effective values of optical constants and are calculated. The roughness and the texture of the surfaces are obtained by Atomic-Force Microscopy (AFM) and Scanning Electronic Microscopy (SEM). One indicates that the refractive index decreases when reducing the pressure of residual gases, and the roughness decreases when elevating the temperature of the substrate. Thus, the behavior of some properties of the films at various conditions of deposition is determined.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 112-114
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission Canals for the Photon-Assisted Transport of Electron through the Double-Barrier Resonant Tunneling Structure
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399516.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.-d
    73.63.Hs
    68.65.Fg
    Opis:
    The resonance and non-resonance transmission canals of double-barrier resonant tunneling structure are established for the electron-photon system using the exact solution of one-dimensional non-stationary Schrödinger equation expanded into the Fourier range. It is shown that besides the main and satellite, the mixed quasi-stationary states which cause the appearance of specific transmission canals with the properties strongly dependent on the intensity and frequency of electromagnetic field, exist in the nanostructure.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 94-101
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The experimental study of glass multilayer columns using digital image correlation
    Autorzy:
    Demchyna, B.
    Surmai, M.
    Tkach, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/378961.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    laminated glass column/glass multilayer column
    digital image correlation
    triplex
    layer glass
    glass column
    korelacja obrazu cyfrowego
    szkło warstwowe
    kolumna szklana
    Opis:
    Purpose: The purpose of the research is to study the deformability of glass multilayer columns at the central compression using digital image correlation. It becomes possible to use the method of digital image correlation for the experimental study of load bearing building structures of glass. Design/methodology/approach: The approach which has been used to solve the above problems is to conduct an experimental study of glass columns on central compression, in which deformations were measured using digital image correlation. Findings: The possibility of using load bearing building structures of glass triplex has been discovered. A program of experimental studies was developed. It included the testing of prototype samples on central compression with rigid fastening. On the basis of the obtained results, a graph of dependence of relative deformations on normal tension, graphs of the dependence of the bending of columns on load in different planes, and a modulus of elasticity of triplex glass have been determined. Research limitations/implications: The lack of a calculation methodology and regulatory documents for designing load bearing building structures of triplex glass increases their cost, since each project is individual and requires the experimental research. Practical implications: Using the approaches developed in the paper, the method of digital image correlation, which is to measure deformations when testing glass structures on central compression can be applied. Originality/value: The experimental study is probably the first one in which deformations of glass columns are determined using the method of digital image correlation, so it is new and original. The lack of a calculation methodology and regulatory documents for designing load bearing building structures of triplex glass, increases their cost, since each project is individual and requires the experimental research.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 96, 1; 32-41
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity in U-T Alloys (T = Mo, Pt, Nb, Zr) Stabilized in the Cubic γ-U Structure
    Autorzy:
    Sowa, S.
    Kim-Ngan, N.
    Krupska, M.
    Paukov, M.
    Tkach, I.
    Havela, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398594.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    74.70.Ad
    72.15.Cz
    Opis:
    Using ultrafast cooling (with the cooling rate up to 10⁶ K/s) helps to minimize the T-alloying concentration (T = Mo, Pt, Pd, Nb, Zr) necessary to retain the γ-U phase down to low temperatures. All investigated splat-cooled U-T alloys become superconducting with $T_{c}$ in the range of 0.61-2.11 K. The bulk character of superconductivity can be concluded for some of the splats when comparing the specific-heat anomaly at $T_{c}$ with the BCS theory prediction.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 521-526
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines
    Autorzy:
    Prikhna, T.
    Gawalek, W.
    Savchuk, Ya.
    Sergienko, N.
    Moshchil, V.
    Sokolovsky, V.
    Vajda, J.
    Tkach, V.
    Karau, F.
    Weber, H.
    Eisterer, M.
    Joulain, A.
    Rabier, J.
    Chaud, X.
    Wendt, M.
    Dellith, J.
    Danilenko, N.
    Habisreuther, T.
    Dub, S.
    Meerovich, V.
    Litzkendorf, D.
    Nagorny, P.
    Kovalev, L.
    Schmidt, Ch.
    Melnikov, V.
    Shapovalov, A.
    Kozyrev, A.
    Sverdun, V.
    Kosa, J.
    Vlasenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549637.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Sv
    74.81.Bd
    74.70.Ad
    74.78.Na
    74.62.Fj
    74.25.Ld
    74.62.Dh
    74.25.Ha
    Opis:
    Materials of the Y-Ba-Cu-O (melt-textured $YBa_{2}Cu_{3}O_{7-δ}$-based materials or MT-YBCO) and Mg-B-O ($MgB_{2}$-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800°C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of $MgB_{2}$-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 $μm^{-1}$), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of $MgB_{2}$-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-$MgB_{12}$ stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high $T_{c}$ (37 K) and critical current densities in materials with $MgB_{12}$ matrix (with 95% of shielding fraction as calculated from the resistant curve).
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 7-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser synthes and optimization of parameters of thin films and epitaxial layers of In4Se3, In4Te3
    Autorzy:
    Vorobets, G. I.
    Strebezhev, V. V.
    Tkach, V. M.
    Vorobets, O. I.
    Strebezhev, V. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/134893.pdf
    Data publikacji:
    2015
    Wydawca:
    Tomasz Mariusz Majka
    Tematy:
    semiconductor thin film
    epitaxial layer
    laser treatment
    indium selenide
    indium telluride
    Opis:
    The influence of the modes of laser treatment on the structural-phase state and electrical properties of thin films and epitaxial layers In4Se3, In4Te3, as well as on the thin-film structures with Schottky barrier of type Au - In4Te3 (In4Se3) are investigated. Thin films In4Se3, In4Te3 received by pulsed laser deposition of stoichiometric homogeneous crystalline materials on a dielectric substrate. The epitaxial layers of In4Se3, In4Te3 were obtained by liquid phase epitaxy. Metal contacts are created by thermal spraying of the respective metals in a vacuum p 10-6 ÷ 10-7 Torr. For the correction of electrophysical characteristics of the studied structures the pulse laser irradiation (PLI) with 1,06 m, 1 ÷ 4 ms was used. The surface morphology of the films on various stages of formation of the structures was investigated by SEM and electron diffraction, and the phase composition was monitored by method X - ray spectral electron probe microanalysis. Study of IV characteristics of film contacts Me - In4Te3 (In4Se3) allowed further identify the phase transformation and the basic mechanisms of charge transport in barrier structures after PLI. Investigation of the spectral photosensitivity of film structures showed that under optimum conditions the laser correction can be obtained the shift of the spectral characteristics from 1,7÷1,8 microns to longer wavelengths. The investigated barrier structures may be promising for use as a photodetector for fiber optic communication lines.
    Źródło:
    Journal of Education and Technical Sciences; 2015, 2, 1; 5-8
    2300-7419
    2392-036X
    Pojawia się w:
    Journal of Education and Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Conductivity in Open Cylindrical Two-Barrier Symmetric Resonance Tunnel Structure
    Autorzy:
    Tkach, M.
    Makhanets, O.
    Seti, Ju.
    Dovganiuk, M.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537805.pdf
    Data publikacji:
    2010-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.21.Hb
    73.21.La
    73.40.Gk
    Opis:
    The theory of resonance energies and widths of electron quasi-stationary states and electronic conductivity in open cylindrical two-barrier symmetric resonance tunnel structure is developed. The complete Schrodinger equation is solved within the model of effective masses for rectangular potential wells and barriers. Interaction between electrons and electromagnetic field was taken into account using the approximation of the small signal. The calculations of spectral parameters are performed for $In_{0.53}Ga_{0.47}As$/$In_{0.52}Al_{0.48}As$ resonance tunnel structure. The dependences of conductivity on the energy of mono-energy electrons beam falling at the system and electromagnetic field energy absorbed or emitted by the system are obtained and analyzed. The relation between experimentally measured parameters of conductivity and resonance widths of electron quasi-stationary states in open resonance tunnel structure is established.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 6; 965-970
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron and Exciton Quasi-Stationary s-States in Open Spherical Quantum Dots
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419890.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Dx
    73.21.La
    73.22.Dj
    73.90.+f
    Opis:
    The theoretical calculation of spectral parameters of electron and exciton quasi-stationary s-states in open spherical quantum dot is performed within the effective mass approximation and rectangular potentials model. The conceptions of probability distribution functions (over quasi-momentum or energy) of electron location inside of quantum dot and their spectral characteristics: generalized resonance energies and widths are introduced. It is shown that the generalized resonance energies and widths, obtained within the distribution functions, satisfy the Heisenberg uncertainty principle for the barrier widths varying from zero to infinity. At the same time, the ordinary resonance energies and widths defined as complex poles of scattering S-matrix, do not satisfy it for the small barrier widths and, therefore, are correct only for the open quantum dots with rather wide potential barriers.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 207-211
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ehksperimentalnoe issledovanie osobennostejj raboty iskrovogo DVS s sistemojj termokhimicheskojj parovojj konversii bioehtanola
    Experimental research of work spark ice with bioethanol steam thermochemical conversion
    Autorzy:
    Timoshevsky, B.
    Tkach, M.
    Mitrofanov, A.
    Poznansky, A.
    Proskurin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/78226.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    bioethanol
    steam conversion
    spark ignition engine
    energy index
    reactor
    experimental research
    Opis:
    It is described a construction and an operating principle of the experimental plant for spark engine operation study with system of bioethanol steam thermochemical conversion. The main energy indicators of thermochemical reactor and the properties of the synthesis gas with a different composition, flow of the mixture and the reactor power are received.
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Conductivity of Electrons and Electron-Phonon Interaction in Open Three-Well Nanostructures
    Autorzy:
    Tkach, M.
    Seti, Ju.
    Grynyshyn, Y.
    Voitsekhivska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401886.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kd
    78.67.De
    72.10.Di
    Opis:
    The theoretical description of electronic tunneling transport through the three-well nanostructure $(In_{0.53}Ga_{0.47}As/In_{0.52}Al_{0.48}As)$, being an expanded active region of quantum cascade detector, is presented. Using the solution of the Schrödinger equation, the dynamic conductivity caused by quantum transitions due to the interaction of electrons with electromagnetic field and phonons is calculated. Within the Green functions approach, the electron spectrum, renormalized due to the interaction with confined optical and interface phonons is obtained at cryogenic and room temperatures. The role of different mechanisms of electron-phonon interaction in the formation of temperature shifts, decay rates of electron states and electromagnetic field absorption bands is investigated. It is shown that independently of the temperature, the contribution produced by interface phonons into renormalized electron spectrum is several times bigger than that of confined phonons. However, the experimentally observed long-wave shift and broadening of absorption band at higher temperatures is, mainly, caused by the decreasing heights of resonant tunneling structure potential barriers.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 343-352
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics and current situation of urban forests in Kharkiv region
    Autorzy:
    Musienko, S.
    Lyalin, O.
    Tkach, L.
    Babenko, V.
    Sulkowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/38393.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Badawczy Leśnictwa
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2018, 60, 3
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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