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    Wyświetlanie 1-5 z 5
    Tytuł:
    On the order equivalence relation of binary association measures
    Autorzy:
    Paradowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/330881.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    association coefficient
    result ranking
    linear combination
    zeroed variance determinant
    feature selection
    Opis:
    Over a century of research has resulted in a set of more than a hundred binary association measures. Many of them share similar properties. An overview of binary association measures is presented, focused on their order equivalences. Association measures are grouped according to their relations. Transformations between these measures are shown, both formally and visually. A generalization coefficient is proposed, based on joint probability and marginal probabilities. Combining association measures is one of recent trends in computer science. Measures are combined in linear and nonlinear discrimination models, automated feature selection or construction. Knowledge about their relations is particularly important to avoid problems of meaningless results, zeroed generalized variances, the curse of dimensionality, or simply to save time.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 645-657
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gd$\text{}^{3+}$ Spin-Phonon Interactions in Rare-Earth Fluoride Crystals
    Autorzy:
    Paradowski, M. L.
    Misiak, L. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035540.pdf
    Data publikacji:
    2002-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    76.30.Kg
    Opis:
    The X-band EPR study of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{ }$3, LiYF$\text{}_{4}$ and LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$ single crystals in the temperature range 4.2-295 K was carried out in order to investigate the Gd$\text{}^{3+}$ spin-phonon interactions. Spin-Hamiltonian parameters are analysed in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. The 4f$\text{}^{7}$ electron-phonon interactions can be described by the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain. Temperature-induced distortions of the crystal field, as well as these distortions caused by the La$\text{}^{3+}$/Nd$\text{}^{3+}$ and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions, influence significantly the 4f$\text{}^{7}$ electron-phonon interactions. The coupling constant K$\text{}_{2}$ of 4f$\text{}^{7}$ electrons to the whole phonon spectrum of the crystal lattice is stronger in the LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ with larger temperature-induced distortion of the Gd$\text{}^{3+}$ site symmetry than in LiYF$\text{}_{4}$, LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$. Our results are compared with those for Gd$\text{}^{3+}$-doped RbCdF$\text{}_{3}$ and PbF$\text{}_{2}$ single crystals.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 3; 373-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gd$\text{}^{3+}$-RE$\text{}^{3+}$ Exchange Interactions in Rare-Earth Fluoride Crystals (RE = Ce, Nd, Yb)
    Autorzy:
    Paradowski, M. L.
    Misiak, L. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037294.pdf
    Data publikacji:
    2004-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    75.30.Et
    75.30.Hx
    76.30.Kg
    Opis:
    The investigation of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, CeF$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$, LiYF$\text{}_{4}$, and LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$ single crystals at 4.2 K was carried out in order to study the Gd$\text{}^{3+}$-RE$\text{}^{3+}$ exchange interactions (RE = Ce, Nd, Yb). The exchange interactions were estimated by the application of the molecular-field model at liquid-helium temperature, using the g shift from the isostructural diamagnetic hosts LaF$\text{}_{3}$ and LiYF$\text{}_{4}$ to the paramagnetic hosts. The lattice dynamics is studied by analysing spin-Hamiltonian parameters in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. It is suggested from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters that the rotational contributions influence the exchange interactions significantly. Further, the distortions caused by the La$\text{}^{3+}$/Ce$\text{}^{3+}$, La$\text{}^{3+}$/Nd$\text{}^{3+}$, and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions affect significantly the 4f$\text{}^{7}$ electron-phonon interactions, as well as the exchange interactions. The magnitude of the isotropic exchange interactions is larger for more symmetrical charge distribution of the 4f$\text{}^{7}$ shell.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 5; 445-457
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR of Gd$\text{}^{3+}$-Doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations
    Autorzy:
    Paradowski, M. L.
    Misiak, L. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1995695.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Kg
    Opis:
    The X-band EPR study of Gd$\text{}^{3+}$-doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ single crystal in the temperature range 4.2-295 K is carried out in order to investigate crystal field effects, the Gd$\text{}^{3+}$ spin-phonon interactions, as well as Gd$\text{}^{3+}$ and Nd$\text{}^{3+}$ spin-lattice relaxation times. The local distortions at 4.2 K of the positions of the eight F$\text{}^{-}$ ions surrounding the Gd$\text{}^{3+}$ ion in the La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystal were determined from comparison of the theoretical with the experimental spin-Hamiltonian parameters. The spin-phonon interactions can be described by the Einstein model, which better characterizes the behavior of paramagnetic centers in LaF$\text{}_{3}$ and La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystals than the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 367-380
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enterobiasis and appendicitis; The research amongst the population of children and youths in Szczecin, Poland
    Autorzy:
    Kazmierczak, T.
    Kozanecka, M.
    Paradowski, S.
    Stelmaszczyk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/837134.pdf
    Data publikacji:
    1998
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Tematy:
    Polska
    Szczecin city
    invasion
    child
    Enterobius vermicularis
    enterobiasis
    population
    appendicitis
    Źródło:
    Annals of Parasitology; 1998, 44, 3
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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