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    Wyświetlanie 1-8 z 8
    Tytuł:
    Estimation of temporary decommissioning impact on reliability and durability of oil pipelines
    Autorzy:
    Poberezhny, L.
    Martyniuk, R.
    Stanetsky, A.
    Poberezhna, L.
    Tkach, O.
    Hrytsanchuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/367993.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    oil pipeline
    conservation
    temporary decommissioning
    probability of non-destruction
    pipeline steel 13G1S-U
    rurociąg naftowy
    konserwacja
    wycofanie tymczasowe z eksploatacji
    prawdopodobieństwo nieniszczenia
    stal rurociągowa
    Opis:
    Purpose: Due to changes in the volume of oil transportation, part of the pipelines must be temporarily decommissioned. The purpose of the work is theoretical and experimental study of pressure fluctuations during operation of oil pipelines and their impact on the durability of the pipeline material in work state and after temporary decommissioning (conservation). Design/methodology/approach: The results of oil pressure fluctuation research have given a chance to choose the terms of experimental research providing of the pipe metal mechanical features changes research during oil pipeline exploitation. Findings: Fatigue test modes are selected based on the calculations of the mathematical model developed. Experimental studies of the dependence of the fatigue strength of the pipe material on the conditions of operation have been carried out, which made it possible to determine the parameters of the fatigue curve of the samples. Has been defined that fatigue strength for the new metal pipe samples is more for 20-25% than for the metal samples which had the contacts with lime milk and for 30-40% more than for metal samples which were under exploitation. Research limitations/implications: In the future, more combination of "pipe material - preservation medium" should be explored to establish pain of general regularities. Practical implications: The probabilistic curves of the pipeline non-destruction are constructed, which will be used for practical calculations of the reliability and durability of the 13G1S-U steel pipelines. Originality/value: Mathematical model is made that describes non-stationary oil moves in oil pipeline, that has been caused by jump like changes of oil supply in oil pipeline, on this basis was defined, that oil pressure in oil pipeline provides within non stationary process in a range of 0.4-0.6 Hz frequency and amplitude fluctuation of pressure is 0.1-0.5 MPa.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 94, 1-2; 22-31
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    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:
    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:
    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:
    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
    Tytuł:
    X-Ray Photoelectron Spectroscopy Study of Nitrogen and Aluminum-Nitrogen Doped ZnO Films
    Autorzy:
    Ievtushenko, A.
    Khyzhun, O.
    Shtepliuk, I.
    Tkach, V.
    Lazorenko, V.
    Lashkarev, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399119.pdf
    Data publikacji:
    2013-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    77.55.hf
    68.55.Ln
    Opis:
    Undoped, nitrogen-doped and aluminum-nitrogen co-doped ZnO films were deposited on Si substrates by magnetron sputtering using layer-by-layer method of growth. X-ray photoelectron spectroscopy was employed to characterize electronic properties of undoped and nitrogen doped ZnO films. The effects of N and N-Al incorporation into the ZnO matrix on the X-ray photoelectron spectroscopy core-level and valence-band spectra of the films were studied and discussed.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 5; 858-861
    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
      Wyświetlanie 1-8 z 8

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