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

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Effect of excitation migration on the decay of excited states via electron transfer to acceptors
    Autorzy:
    Gutman, M.
    Hilczer, M.
    Tachiya, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147856.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron transfer
    energy migration
    simulation
    fluorescence decay
    polymer matrix
    Opis:
    Simulation of fluorescence quenching due to electron transfer from a photoexcited donor to an acceptor, in a rigid matrix has been performed. The model assumes competition between processes of the electron transfer and the resonant excitation energy transfer among donors. Electron and energy transfers are described in terms of the Marcus and the Förster theories, respectively. Dependence of the fluorescence quenching on the donor concentration and on the parameters of the Marcus and Förster equations has been investigated at a fixed acceptor concentration. Fluorescence decay curves calculated for various concentrations of donors have been compared with experimental decays.
    Źródło:
    Nukleonika; 2005, 50,suppl.2; 39-43
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Limited usefulness of the test of spontaneous growth hormone (GH) nocturnal secretion as a screening procedure in diagnosing GH deficiency in children with short stature
    Autorzy:
    Smyczynska, J.
    Stawerska, R.
    Lewinski, A.
    Hilczer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/50945.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in circadian rhythm of prolactin in short children are dependent on growth hormone secretion
    Autorzy:
    Stawerska, R.
    Smyczynska, J.
    Hilczer, M.
    Lewinski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/50291.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ Ceramics Obtained from Mechanosynthesized Nanopowders
    Autorzy:
    Markiewicz, E.
    Hilczer, B.
    Balcerzak, M.
    Jurczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375503.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Bc
    81.07.Wx
    81.20.Ev
    75.85.+t
    81.40.Rs
    Opis:
    Electric conductivity of $(Bi_{1-x}La_{x}FeO_{3})_{0.5}(PbTiO_{3})_{0.5}$ ceramics obtained from nanopowders synthesized by high-energy milling from respective oxides was studied in the frequency range 10 mHz ÷ 1 GHz. At room temperatures the low-frequency conductivity was found to be dominated by the contribution from poor-conducting grain boundaries, whereas the contribution in the range 1 kHz ÷ 1 MHz, due to the grain interior, was related by us to the small polaron hopping. Moreover, the electron exchange between ferric and ferrous ions activated at higher frequencies was found to be added to the conductivity above ≈ 1 MHz.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 971-974
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superionic Phase Transition in Rb$\text{}_{4}$LiH$\text{}_{3}$(SeO$\text{}_{4}$)$\text{}_{4}$ Single Crystals
    Autorzy:
    Połomska, M.
    Hilczer, B.
    Wolak, J.
    Pietraszko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931312.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.50.Em
    62.20.Dc
    77.22.Gm
    Opis:
    Derivatographic, dielectric and complex impedance studies of Rb$\text{}_{4}$LiH$\text{}_{3}$(SeO$\text{}_{4}$)$\text{}_{4}$ crystals revealed a superionic phase transition at T$\text{}_{s}$ ≈ 448 K. The bulk conductivity rises from 10$\text{}^{-6}$ to 10$\text{}^{-4}$ (Ωm)$\text{}^{-1}$ at T$\text{}_{s}$, and the activation energy of conductivity in the direction of crystal axes a and b (where a = b for tetragonal symmetry) W$\text{}_{a}$ = W$\text{}_{b}$ decreases from 0.94 eV in the low temperature phase to the value of 0.27 eV at T > T$\text{}_{s}$. The analysis of the results of X-ray studies at room temperature and at 450 K indicates that the fast ion transport, characterized by low activation energy, is related to the delocalization of the H2 protons in the O(12)-H2-O(24) bonds linking the Se(1)O$\text{}_{4}$ and Se(2)O$\text{}_{4}$ tetrahedra. The "cogwheel" mechanism is suggested to be involved in the fast proton transport.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 5; 825-833
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Restricted Validity of the Two-State Model Describing a Vibronic EPR g-Factors Averaging in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Tutton Salt Crystals Doped with Cu$\text{}^{2+}$ Ions
    Autorzy:
    Hoffmann, S. K.
    Kaszyński, R.
    Augustyniak, M. A.
    Hilczer, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011161.pdf
    Data publikacji:
    1999-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.90.+t
    76.30.-v
    Opis:
    Single crystals and powder EPR spectra of Cu$\text{}^{2+}$ ions in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O were recorded in the temperature range of 4.2-300 K and the g-factor temperature variations were determined. The g$\text{}_{z}$ and g$\text{}_{y}$ have the values of 2.443 and 2.134, respectively, at the rigid lattice limit below 20 K, and then continuously tend to an average value on heating. This vibronic averaging produced by reorientations of Cu(H$\text{}_{2}$O)$\text{}_{6}$-complexes between Jahn-Teller distorted octahedral configurations is described in terms of a two-state Silver-Getz model which is known as a good model for diamagnetic non-ammonium Tutton salts. We found, however, that this model is only a crude approximation in Cs$\text{}_{2}$Zn(SO$\text{}_{4}$)$\text{}_{6}$·6H$\text{}_{2}$O below 150 K. Above this temperature the model works better and describes the vibronic dynamics between the two lowest energy potential wells in the adiabatic potential surface differing in the energy of δ$\text{}_{12}$=318(9) cm$\text{}^{-1}$=3.7 kJ/mol.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 6; 733-740
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Spin Echo Envelope Modulation Analysis of SeO¯$\text{}_{3}$ Radical in (NH$\text{}_{4}$)$\text{}_{3}$H(SeO$\text{}_{4}$)$\text{}_{2}$ Single Crystal
    Autorzy:
    Tritt-Goc, J.
    Goslar, J.
    Hilczer, W.
    Hoffmann, S.
    Augustyniak, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929835.pdf
    Data publikacji:
    1993-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Lz
    76.30.Mi
    Opis:
    A detailed computer analysis of the electron spin echo envelope modulations of SeO$\text{}_{3}$ radical in a suitable orientation of (NH$\text{}_{4}$)$\text{}_{3}$H(SeO$\text{}_{4}$)$\text{}_{2}$ single crystal is presented. It was found that the modulations are due to a weak dipolar coupling with nitrogens and protons of the only two neighbouring NH$\text{}_{4}$ groups among the five NH$\text{}_{4}$ groups surrounding SeO¯$\text{}_{3}$ center. Isotropic dipolar coupling constant is 1.7 MHz for nitrogens and 0.9 MHz for protons. It was shown that thermal reorientations of NH$\text{}_{4}$ groups observed by NMR have a negligible effect on the electron spin echo envelope modulation pattern but can be responsible for the same value of a$\text{}^{H}$$\text{}_{iso}$ for all protons in a NH$\text{}_{4}$ group. A good fit obtained between experimental spectra and theoretical calculations assuming nondisturbed crystal geometry indicates a small damage of the crystal by X-rays during the radical center formation.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 6; 1131-1141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR and Spectral Studies of a Molecular and Crystal Structure of Cu (3,5-dimethylpyridine)$\text{}_{3}$(NO$\text{}_{3}$)$\text{}_{2}$
    Autorzy:
    Hoffmann, S. K.
    Goher, M. A. S.
    Hilczer, W.
    Goslar, J.
    Hafez, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930620.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    61.66.-f
    76.30.Da
    Opis:
    X-band single crystal EPR, IR and UV-VIS data are used to deduce a molecular and crystal structure of a new compound with a chemical formula Cu(3,5-dimethylpyridine)$\text{}_{3}$(NO$\text{}_{3}$)$\text{}_{2}$. EPR shows that four magnetically inequivalent molecules exist in the crystal unit cell of C$\text{}_{4v}$ symmetry. IR spectra suggested that both monodentate and bidentate NO$\text{}_{3}$-groups exist in the crystal. A most probable Cu(II) complex geometry with d$\text{}_{x²-y²}$ ground state is a square pyramid with three nitrogens from 3,5-dimethylpyridine molecules and one oxygen from monodentate nitrato group in a basal plane and an oxygen from NO$\text{}_{3}$-group in apical position. There exists a chemical contact between complexes as it is indicated by the exchange interaction with |J| ≤ 1 cm$\text{}^{-1}$. It suggests that square pyramid complexes are arranged in polymeric chains with semi-coordination of bidentate NO$\text{}_{3}$-group to the adjacent Cu(II) ion. An extended analysis of an exchange averaging effect between EPR lines from two and four Cu(II) sites is presented with equations relating molecular and crystal g-factors.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 517-530
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Microwave Study of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$-Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$ Composite
    Autorzy:
    Czyżak, B.
    Stankowski, J.
    Hilczer, B.
    Krupski, M.
    Morawski, P.
    Andrzejewski, B.
    Marfaing, J.
    Régnier, S.
    Caranoni, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964222.pdf
    Data publikacji:
    1997-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.80.-e
    Opis:
    The ferroelectric relaxor Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$-superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ 50% in weight composite exhibits the onset critical temperature T$\text{}_{c}$=95 K. High pressure studies yield the factor dT$\text{}_{c}$/dp of 1.0 K/GPa, close to the value observed for a pure YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ compound. The microwave absorption studies show the significant role of the intergrain weak links.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 6; 1103-1109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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