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Wyszukujesz frazę "Stepanov, S. V." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Revision of the Model of Formation of Radiolytic Products in Aqueous Solutions
    Autorzy:
    Stepanov, S. V.
    Byakov, V. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042192.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    36.10.Dr
    78.70.Bj
    Opis:
    Mathematical model of formation of radiolytic products (e$\text{}_{aq}^{-}$, H, OH, H$\text{}_{2}$, H$\text{}_{3}$O$\text{}^{+}$, OH$\text{}^{-}$, Ps) in water is developed. It takes into account (1) reactions between dissolved scavengers of thermalized and hydrated electrons as well as epithermal ones; (2) ambipolar diffusion expansion of the intratrack species; (3) additional channels of Ps and H$\text{}_{2}$ formation due to appearance of weakly trapped electrons. Good agreement is obtained with experimental data on kinetics of accumulation of the products in pure water and their concentration variations in aqueous solutions.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 651-660
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Trapped and Solvated Electrons in Ps Formation
    Autorzy:
    Stepanov, S. V.
    Byakov, V. M.
    He, C.
    Hirade, T.
    Mikhin, K. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042190.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    36.10.Dr
    78.70.Bj
    82.35.Lr
    Opis:
    Role of trapped and solvated electrons in Ps formation is discussed. Combination of thermalized positron with such electrons is possible from the viewpoint of the energy balance and may results in Ps formation. This process proceeds during all e$\text{}^{+}$ lifetime in matter. Fitting of raw experimental e$\text{}^{+}$ - e$\text{}^{-}$ annihilation spectra has to be based on an adequate physical input, which often leads to necessity of nonexponential deconvolution of the spectra. We have interpreted the Ps formation data in polyethylene, ethylene-methylmethacrylate and polymethylmethacrylate in dark and in light vs. time of the measurement and temperature. Parameters characterized accumulation of trapped electrons and their recombination with counter ions and positrons are obtained.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 642-650
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primary Chemical Reactions Induced by Transformation of Radioactive Nuclei in Solids at Low Temperatures. Investigation by Means of the Emission Mössbauer and Positron Spectroscopies
    Autorzy:
    Byakov, V. M.
    Kulikov, L. A.
    Perfil'ev, Y. D.
    Stepanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043320.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Fe
    36.10.Dr
    78.70.Bj
    Opis:
    A set of early chemical reactions in grapes of ionization (blobs) arising in tracks of fast electrons and positrons in liquids as well as formed by the Auger electrons in frozen aqueous media around decaying Mössbauer $\text{}^{57}$Co or $\text{}^{119m}$Sn nuclei is suggested. The mechanism predicts a correlated variation of the formation probabilities of intrablob final products, namely Fe$\text{}^{2+}$-Fe$\text{}^{3+}$ or Sn$\text{}^{2+}$-Sn$\text{}^{4+}$ ions, positronium atom and molecular hydrogen with variation of temperature, degree of crystallinity, concentration of electron scavengers. These correlations indicate on similarity of chemical processes as in blobs created by $\text{}^{57}$Co and $\text{}^{119m}$Sn after their decay as well as in blobs produced in tracks of fast positrons and electrons.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 792-798
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing New Routine for Processing Two-Dimensional Coincidence Doppler Energy Spectra and Evaluation of Electron Subsystem Properties in Metals
    Autorzy:
    Stepanov, P.
    Stepanov, S.
    Byakov, V.
    Selim, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033257.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Positron annihilation
    Doppler broadening
    metals
    core electrons
    Opis:
    A digital coincidence Doppler broadening (CDB) spectrometer consisting of two HPGe detectors is assembled; the energy resolution of each detector is 1.1 keV at energies near the annihilation line. Two desktop applications for CDB spectra processing are developed. TLIST Processor converts two-dimensional CDB spectra into one-dimensional spectra. Another tool SW Calculator deconvolutes the experimental CDB spectra into contributions from positron annihilation with valence, core and conduction band electrons. The program estimates the energies of the corresponding electrons and evaluates S and W parameters of the CDB spectra.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1628-1633
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Track Effects in Positronium Formation
    Autorzy:
    Stepanov, S.
    Byakov, V.
    Duplâtre, G.
    Stepanov, P.
    Bokov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030026.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    positron
    positronium
    annihilation
    ion-electron recombination
    solvation
    mobility
    external electric field
    track effects
    polar and nonpolar liquids
    Opis:
    We discuss some aspects important for interpretation of the Ps formation process in liquids and molecular media: (1) inhomogeneity of intratrack reactions and parameters of the e⁺ track, (2) final states of e⁺, its solvation in polar and nonpolar liquids, relation to e⁺ mobility, (3) quasi-neutrality of the e⁺ blob and its ambipolar outdiffusion, (4) appearance of the "in-blob" and "out-of-the-blob" positron fractions, and (5) electric field effect on Ps formation.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1461-1465
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positrons and Positronium Atoms in a Condensed Phase Close to Its Melting Point
    Autorzy:
    Stepanov, S.
    Zvezhinskiy, D.
    Byakov, V.
    Duplâtre, G.
    Stepanov, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196038.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    34.80.Lx
    78.70.Bj
    82.30.Gg
    Opis:
    Investigation of the local heating effect at the terminal part of a fast positron track sheds light on the accumulation of defects in a frozen medium close to its melting point. Estimations of the formation energies of the structural defects which may trap the Ps atom as well as a contribution of these defects to the enthalpy of fusion are obtained.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 691-695
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Quasi-Free and Bubble Positronium States in Water and Aqueous Solutions
    Autorzy:
    Stepanov, S.
    Duplâtre, G.
    Byakov, V.
    Zvezhinskiy, D.
    Subrahmanyam, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1338623.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    34.80.Lx
    82.30.Gg
    Opis:
    It is shown that in aqueous solutions a positronium atom is first formed in the quasi-free state, and, after 50-100 ps, becomes localized in a nanobubble. Analysis of the annihilation spectra of $NaNO_3$ aqueous solutions shows that the hydrated electron is not involved in the positronium (Ps) formation.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 770-774
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Primary Radiolytic Reactions in the Auger Blob Formed by Radioactive Transformation of $\text{}^{57}Co$ into $\text{}^{57}Fe$ in Frozen Aqueous Medium
    Autorzy:
    Stepanov, S.
    Perfil'ev, Yu.
    Byakov, V.
    Kulikov, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382326.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    82.50.Kx
    82.80.Ej
    Opis:
    The emission of the Auger electrons during the formation of the Mössbauer nucleus $\text{}^{57}Fe$ leads not only to the formation of multicharged $\text{}^{57}Fe^{n+}$ ion, but also to the appearance of the Auger blob, a cloud of several hundreds of ion-electron pairs ($H_2O^{+}$, e¯) in the solvent around the Fe ion. Fast radiation-chemical reactions therein determine the experimentally observable ratio of the yields of final chemically stable charged states of the Mössbauer ions ($Fe^{3+}$ and $Fe^{2+}$). This ratio strongly depends on reaction rates constants between $H_2O^{+}$, e¯, and the solute S. We have shown that in contrast to radiation chemical data the reactivity of $NO_{3}^{-}$ anions with quasi-free track electrons in frozen aqueous solutions exceeds those of $H_{3}O^{+}$, $ClO_{4}^{-}$, and $HSO_{4}^{-}$ ions only by a factor of three instead of ≈ 100 which follows from the radiation chemical experiments.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 843-845
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compliance with legal aspects of the applying of e-Learning in the training of seafarers
    Autorzy:
    Sokolov, S. S.
    Kovalnogova, N. M.
    Mitrofanova, A. V.
    Stepanov, V. A.
    Gorobtsov, A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/116321.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    legal aspects
    e-Learning
    e-Learning in the training of seafarers
    STCW
    Admiral Makarov State University of Maritime and Inland Shipping
    Maritime Education and Training (MET)
    MET system in Russia
    applying of e-Learning
    Opis:
    The article examines applicability of the world experience of e-learning and distance education technologies structure to STCW recommendations and national legal requirements of the Russian Federation. There are comprehensive comparative analysis of a distance learning system and STCW recommendations. There are some results of the distance education system LMS “FARWATER” test period for the benefits of seafarers vocational education and the Admiral Makarov State University of Maritime and Inland Shipping (Admiral Makarov SUMIS) where the LMS “FARWATER” was designed.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 3; 457-460
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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