Autor: Shantarovich, V. P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Some Aspects of Positronium Interaction with Elementary Free Volumes in Polymers
Autorzy:: Shantarovich, V. P.
Powiązania:: https://bibliotekanauki.pl/articles/2025763.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: This paper contains a discussion of original and recently published results on positronium annihilation lifetime studies of elementary free volumes in the group of polymer glasses. The results are used for indication of non-homogeneity of these materials and give some basis for considering a connection of the long-lived component intensities I$\text{}_{3}$(I$\text{}_{4}$) with concentrations N$\text{}_{3}$(N$\text{}_{4}$) of elementary free volumes and, in this way, with fractional free volume.
Źródło:: Acta Physica Polonica A; 2001, 99, 3-4; 487-495
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Application of Coincidence Doppler Broadening Spectroscopy to Hydrocarbons at Different Substance States
Autorzy:: Yu, R.
Suzuki, T.
Ito, Y.
Djourelov, N.
Kondo, K.
Shantarovich, V. P.
Powiązania:: https://bibliotekanauki.pl/articles/2042205.pdf
Data publikacji:: 2005-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 36.10.Dr
82.30.Gg
78.70.Bj
Opis:: Coincidence Doppler broadening spectroscopy was applied to study n-hexane (C$\text{}_{6}$H$\text{}_{14}$), cyclohexane (C$\text{}_{6}$H$\text{}_{12}$) and cyclohexanone (C$\text{}_{6}$H$\text{}_{10}$O), at solid, as well as liquid states. The experiments were performed in parallel with traditional positron annihilation lifetime spectroscopy. Significant positron trapping by oxygen was observed in cyclohexanone; the oxygen effect is stronger in liquid state than in solid one, which can possibly be attributed to positron solvation in polar solution. Coincidence Doppler broadening results for n-hexane and cyclohexane indicate an existence of higher energetic annihilation electrons in Ps-bubble forming liquids than that in solids.
Źródło:: Acta Physica Polonica A; 2005, 107, 4; 697-701
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Comments on the Effect ofγ-Irradiation on Positronium Formation in Polymers at Low Temperatures
Autorzy:: Shantarovich, V. P.
Hirade, T.
Kevdina, I. B.
Gustov, V. W.
Oleinik, E. F.
Powiązania:: https://bibliotekanauki.pl/articles/2025760.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: Quantitative description of the effect of γ-irradiation of PE and PMMA on positronium formation on the trapped electrons at low temperatures is suggested. The consideration shows that, at least in these substances, the number of the trapping centers is probably enough to localize all ortho-positronium, and therefore the intensity of the long-lived positronium component is dependent mostly on the probability of Ps formation but not on the number of the trapping centers.
Źródło:: Acta Physica Polonica A; 2001, 99, 3-4; 497-501
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Some Aspects of Free Volume Studies in Molecular Substances Using Positron Annihilation Experiments
Autorzy:: Shantarovich, V. P.
Suzuki, T.
Djourelov, N.
Shimazu, A.
Gustov, V. W.
Kevdina, I. B.
Powiązania:: https://bibliotekanauki.pl/articles/2042187.pdf
Data publikacji:: 2005-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: Positron annihilation lifetime spectroscopy is accepted now as a method for the studies of elementary free volumes (free volume holes) in solids, in polymers in particular. The aim of this paper is to discuss some problems, the difficulties on the way of this application and to illustrate them by several examples obtained by the authors.
Źródło:: Acta Physica Polonica A; 2005, 107, 4; 629-634
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: The Influence of Deformation and Chemical Composition on Elementary Free Volumes in Glassy Polymers
Autorzy:: Shantarovich, V. P.
Novikov, Yu. A.
Suptel, Z. K.
Oleinik, E. F.
Boyce, M. C.
Powiązania:: https://bibliotekanauki.pl/articles/2008185.pdf
Data publikacji:: 1999-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: A relation between positronium annihilation characteristics and concentration of elementary free volumes is considered for the case of positronium formation before its localization. We estimated the diffusion coefficient of nonlocalized positronium (≈10$\text{}^{-4}$ cm$\text{}^{2}$/s). The positron annihilation lifetime studies of uniaxial compression and annealing of some glassy polymers revealed variations of the shape of elementary free volumes size-distributions.
Źródło:: Acta Physica Polonica A; 1999, 95, 4; 659-662
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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