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    Wyświetlanie 1-6 z 6
    Tytuł:
    Anisotropic Magnetic Susceptibility of Neodymium Substituted SrLaAlO$\text{}_{4}$ Crystals
    Autorzy:
    Fink-Finowicki, J.
    Puźniak, R.
    Baran, M.
    Jabłoński, R.
    Berkowski, M.
    Pajączkowska, A.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931256.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Hx
    75.10.Dg
    71.70.Ch
    Opis:
    The uniaxial anisotropy of magnetic properties of SrLa$\text{}_{1-x}$Nd$\text{}_{x}$AlO$\text{}_{4}$ single crystals (x = 0.01 and 0.05) was found from the measurements of temperature dependencies of magnetic susceptibility. Results of measurements, with magnetic field along a- and c-axis, are compared with the similar data obtained for CaNdAlO$\text{}_{4}$ crystal. The successful description of experimental data was done in frames of the crystal field approximation. The anisotropy of magnetic susceptibility appears due to crystal field acting on magnetic neodymium ions in a system without exchange interactions.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 633-637
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparision of Two Construction Algorithms for Takagi-Sugeno Fuzzy Models
    Autorzy:
    Nelles, O.
    Fink, A.
    Babuska, R.
    Setnes, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/911156.pdf
    Data publikacji:
    2000
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    modelowanie
    identyfikacja
    model rozmyty
    turbosprężarka doładowująca
    modeling
    identification
    Takagi-Sugeno fuzzy models
    local linear models
    turbocharger
    Opis:
    This paper compares two different approaches to the construction of Takagi-Sugeno fuzzy models from data. These models approximate nonlinear systems by means of interpolation between local linear models. The main issue in the construction of Takagi-Sugeno models is the decomposition of the operating space into validity regions for the local models. The way this decomposition is done influences the complexity, accuracy and transparency of the obtained model. The first of the presented methods, the local linear model tree (LOLIMOT) algorithm generates incrementally the fuzzy model by axis-orthogonal decomposition of the input space. In the other method, product-space fuzzy clustering (the Gustafson-Kessel algorithm) is used to partition the available data into fuzzy subsets. The fundamental advantages and drawbacks of both the alternative strategies are pointed out. Their properties and real-world applicability are illustrated by building a dynamic model of a truck Diesel engine turbocharger.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2000, 10, 4; 835-855
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ellipsometric Studies of NdMnO$\text{}_{3}$ Single Crystals
    Autorzy:
    Babonas, G. J.
    Reza, A.
    Szymczak, R.
    Baran, M.
    Shiryaev, S.
    Fink-Finowicki, J.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037130.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    78.20.Ci
    Opis:
    Ellipsometric studies of NdMnO$\text{}_{3}$ single crystals of orthorhombic symmetry were carried out in the spectral range 0.5-5.0 eV. Experimental data, which were obtained on the (001)$\text{}_{pc}$-type planes of pseudo-cubic system, were analyzed in the model of biaxial crystal. For the first time, three componentsε$\text{}_{x}$,ε$\text{}_{y}$,ε$\text{}_{z}$ of the effective dielectric function for manganites of orthorhombic symmetry were determined. From ellipsometric data, the spectra of optical conductivity and loss function were also calculated and considered. The fine structure of the spectra and optical anisotropy was the basis for discussion of the microscopic origin of the optical transitions responsible for the optical features. The electronic excitations due to dipole-forbidden spin-allowed transitions of the d-d-type in Mn-ions, f-f-type in Nd-ions and charge-transfer 2p(O)-3d(Mn) transitions were taken into account. The data for NdMnO$\text{}_{3}$ were compared with those obtained for other related undoped and doped single crystals of perovskite-type structure, LaMnO$\text{}_{3}$, (LaBa)(MnCo)O$\text{}_{3}$ and (LaCa)CoO$\text{}_{3}$.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 197-208
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extensions of the minimum labelling spanning tree problem
    Autorzy:
    Cerulli, R.
    Fink, A.
    Gentili, M.
    Voss, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/308930.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    network design
    metaheuristics
    spanning trees
    labelling trees
    Steiner tree problem
    Opis:
    In this paper we propose some extensions of the minimum labelling spanning tree problem. The main focus is on the minimum labelling Steiner tree problem: given a graph G with a color (label) assigned to each edge, and a subset Q of the nodes of G (basic vertices), we look for a connected subgraph of G with the minimum number of different colors covering all the basic vertices. The problem has several applications in telecommunication networks, electric networks, multimodal transportation networks, among others, where one aims to ensure connectivity by means of homogeneous connections. Numerical results for several metaheuristics to solve the problem are presented.
    Źródło:
    Journal of Telecommunications and Information Technology; 2006, 4; 39-45
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice
    Autorzy:
    Szymczak, H.
    Szymczak, R.
    Baran, M.
    Fink-Finowicki, J.
    Krzymanska, B.
    Aleshkevych, P.
    Jezierski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812268.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.25.+z
    75.30.Gw
    75.30.Kz
    75.50.-
    Opis:
    This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like $SrGa_{12-x}Cr_xO_{19}$ and kagome staircase $Co_3V_2O_8$ doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 35-42
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Superconductivity of $FeSe_{1 - x}$ and $FeTe_{1 - y}Se_{y}$ Crystals: Dependence on the Synthesis Methods, Starting Composition, and Growth Conditions
    Autorzy:
    Gawryluk, D.
    Fink-Finowicki, J.
    Wiśniewski, A.
    Puźniak, R.
    Domukhovski, V.
    Diduszko, R.
    Berkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537007.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    74.25.Ha
    74.62.Bf
    74.70.Xa
    81.10.Fq
    Opis:
    Syntheses of superconducting iron chalcogenides $FeSe_{1 - x}$ (x = 0-0.15) and $FeTe_{1 - y}Se_{y}$ (y = 0.3-0.55) were performed. Superconducting phase of iron selenide was obtained by the solid-state reaction and from liquid phase. The highest values of critical temperature ($T_c$ = 8.2-8.7 K) exhibit $FeSe_{1-x}$ obtained by the crystallization from a melt with excess of iron less than 1 mol%. The samples from a melt contain up to 78% of tetragonal phase, as estimated by the X-ray diffraction. Lattice parameters and unit cell volume for the samples exhibiting highest $T_{c}$ and sharpest transition to superconducting state are limited to narrow range, with c/a ratio close to 1.469. The samples with excess of selenium contain higher amount of hexagonal phase than stoichiometric one. Superconducting single-crystalline samples of $FeTe_{1 - y}Se_{y}$ (up to 100% of tetragonal phase) were obtained using Bridgman's method. When y value increases, the volume of unit cell decreases. The critical temperature $T_{c}$ changes from ≈ 11.5 K for y ≈ 0.3 to ≈ 14.7 K for y ≈ 0.5.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 331-335
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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