Autor: Sienkiewicz, A - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: On the Tunneling Among Shallow and Deep Centers in ZnS
Autorzy:: Zakrzewski, A.
Sienkiewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/1879959.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Jv
76.30.Fc
Opis:: Results of the photo-ESR studies of recharging processes due to tunneling in ZnS:Cu crystals are presented. It was found that the tunneling among shallow and deep centers seems to be a second order effect in the overall photoluminescence quenching in ZnS by transition metal impurities.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 251-254
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The Luminescence and EPR Characterisation of Neutron Transmutation Doped Gallium Phosphide
Autorzy:: Gołdys, E.
Godlewski, M.
Sienkiewicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/1879964.pdf
Data publikacji:: 1991-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.80.Hg
78.55.Cr
76.30.Lh
Opis:: The photoluminescence and EPR measurements of neutron irradiated and annealed GaP samples are presented. Both methods confirm the presence of neutral Ge$\text{}_{Ga}$. The EPR spectrum gives also an indication of interstitial Ge.
Źródło:: Acta Physica Polonica A; 1991, 79, 2-3; 259-262
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Porosity of Silica Monoliths with Tailored Mesopores of Ink-Bottle Shape Determined by Nitrogen Adsorption and Positron Annihilation Lifetime Spectroscopy
Autorzy:: Sienkiewicz, A.
Kierys, A.
Gorgol, M.
Zaleski, R.
Powiązania:: https://bibliotekanauki.pl/articles/1033934.pdf
Data publikacji:: 2017-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Rm
68.43.-h
81.70.-q
78.70.Bj
36.10.Dr
Opis:: The comparison of pore size distributions obtained with the use of two porosimetric methods: low temperature nitrogen sorption (LN2) and positron annihilation lifetime spectroscopy (PALS), was performed for porous silica monoliths. Four investigated samples were prepared under various synthesis conditions. Nitrogen sorption showed the presence of bottle-shaped pores in all investigated samples. In addition, it seems that the presence of methanol during synthesis influences porosity to a greater extent than organic additives. Quite good agreement between the LN2 and PALS results was observed only for the silica monolith synthesized with β-cyclodextrins as pore directing agent. The biggest discrepancy in the results obtained from these two techniques was observed for the silica gel synthesized with no additives. The origin of such discrepancies, taking into account the shape of pore size distribution and deficiencies of data analysis techniques, is discussed.
Źródło:: Acta Physica Polonica A; 2017, 132, 5; 1568-1571
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dynamic Structural and Topological Phase Transitions on the Warsaw Stock Exchange: A Phenomenological Approach
Autorzy:: Sienkiewicz, A.
Gubiec, T.
Kutner, R.
Struzik, Z.
Powiązania:: https://bibliotekanauki.pl/articles/1400183.pdf
Data publikacji:: 2013-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 89.65.Gh
02.50.Ey
02.50.Ga
05.40.Fb
02.30.Mv
Opis:: We study crash dynamics of the Warsaw Stock Exchange by using minimal spanning tree networks. We identify the transition of the complex network during its evolution from a (hierarchical) power law minimal spanning tree network - representing the stable state of Warsaw Stock Exchange before the recent worldwide financial crash, to a superstar-like (or superhub) minimal spanning tree network of the market decorated by a hierarchy of trees - an unstable, intermediate market state. Subsequently, we observe a transition from this complex tree to the topology of the (hierarchical) power law minimal spanning tree network decorated by several star-like trees or hubs - this structure and topology represent the Warsaw Stock Exchange after the worldwide financial crash, and can be considered to be an aftershock. Our results can serve as an empirical foundation for a future theory of dynamic structural and topological phase transitions on financial markets.
Źródło:: Acta Physica Polonica A; 2013, 123, 3; 615-620
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Co$\text{}^{2+}$ Ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co - ESR and Optical Studies
Autorzy:: Świątek, K.
Surkova, T. P.
Sienkiewicz, A.
Zakrzewski, A. J.
Godlewski, M.
Giriat, W.
Powiązania:: https://bibliotekanauki.pl/articles/1992580.pdf
Data publikacji:: 1998-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Gs
76.30.Fc
78.55.Et
Opis:: The electron spin resonance of Co$\text{}^{2+}$ ions in ZnS$\text{}_{x}$Se$\text{}_{1-x}$:Co mixed crystals was measured at temperature of 3 K and microwave frequency of 9.47 GHz. Trigonal Co$\text{}_{Zn}^{2+}$-S center in the ZnS$\text{}_{0.001}$Se$\text{}_{0.999}$:Co crystal was identified and parameters of relevant spin Hamiltonian were determined. Influence of alloy disorder in the anion sublattice on the Co$\text{}_{Zn}^{2+}$ ground and first excited states is briefly discussed.
Źródło:: Acta Physica Polonica A; 1998, 94, 3; 593-596
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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