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    Wyświetlanie 1-14 z 14
    Tytuł:
    Effect of Gravitation on Water Migration in Granular Media
    Autorzy:
    Milczarek, J.
    Fijał-Kirejczyk, I.
    Żołądek, J.
    Chojnowski, M.
    Kowalczyk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813182.pdf
    Data publikacji:
    2008-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.56.+r
    68.08.De
    81.70.-q
    Opis:
    The results of the experiments on water migration in unsaturated granular media performed with dynamic neutron radiography technique are presented. It was found that the porosity of the medium did not determine the kinetics of the process in a marked way. The influence of gravity was found to be considerable for media like coarse sand and gravel, consisting of large grains. No effect of gravitation on the water migration in clay beds was observed. The results are discussed in terms of the classical Washburn-Bosanquet theory of adhesion driven motion of the liquid in a straight circular capillary under gravity. It was found that this theory provides only qualitative description of the water migration within granular media, and the viscous dissipation effects are greatly underestimated.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 4; 1245-1254
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Structure and X-Ray Photoelectron Spectra of YNi$\text{}_{4}$B Compound
    Autorzy:
    Pugaczowa-Michalska, M.
    Chełkowska, G.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036993.pdf
    Data publikacji:
    2003-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    82.80.Pv
    71.20.-b
    63.70.+h
    Opis:
    The electronic structure of the ternary YNi$\text{}_{4}$B compound, crystallizing in the hexagonal CeCo$\text{}_{4}$B structure (P6/ mmm space group), was studied by X-ray photoelectron spectroscopy and ab initio calculations. Core levels and the valence band were investigated. The X-ray photoelectron spectroscopy valence band is compared with that obtained from ab initio calculations. The valence band spectrum at the Fermi level exhibits the domination of the Ni(3d) states, which are hybridized with 4d states of Y and 2p states of B. The theoretical electronic specific heat coefficientγ derived from N(E$\text{}_{F}$) is about 11.33 mJ/(mol K$\text{}^{2}$) for experimental lattice parameters. The calculated bulk modulus is B$\text{}_{0}$=1.61632 Mbar.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 5; 487-494
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stimulated and Laser Emission in CdZnTe/CdMnTe Double Quantum Well Heterostructures
    Autorzy:
    Kowalczyk, L.
    Karczewski, G.
    Wojtowicz, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933829.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.45.+h
    71.55.Gs
    Opis:
    Stimulated emission by optical excitation has been investigated in CdZnTe/CdMnTe quantum well heterostructures. Laser action has been achieved at 4.2 K and at 77 K with relatively low threshold values of the excitation intensity. Photοluminescence excitation spectra of the stimulated emission were obtained indicating that the optical gain involves exciton-exciton inelastic scattering.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 787-790
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Properties of CeNiAl₄ Based on ab initio Calculations and XPS Measurements
    Autorzy:
    Werwiński, M.
    Chełkowska, G.
    Szajek, A.
    Kowalczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030430.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.b
    74.25.Jb
    Opis:
    The CeNiAl₄ compound crystallizes in an orthorhombic YNiAl₄-type structure with a Cmcm space group. The earlier susceptibility data and X-ray photoelectron spectroscopy (XPS) suggested a localized character of the 4f states in CeNiAl₄ with a valence state close to a Ce⁺³ ion. In this work we present a combined theoretical and experimental study of the electronic structure for the Kondo dense system CeNiAl₄ based on the XPS data and ab initio calculations. Using the band structure calculations the theoretical XPS valence band spectra are evaluated. Below the Fermi energy the total density of states contains mainly 3d states of Ni hybridized with Ce 4f states.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 517-519
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antibacterial Properties of Polyester Fibres Materials with Titanium Dioxide Deposited on Their Surface
    Autorzy:
    Karbownik, I.
    Kowalczyk, D.
    Malinowska, G.
    Paruch, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807589.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Ba
    68.47.Mn
    81.07.Wx
    Opis:
    $TiO_{2}$ particles were deposited onto the surface of polyester (PES) material. The microbiological research were carried out on two bacteria strains: Staphylococcus aureus and Klebsiella pneumoniae, which showed antibacterial properties of the PES surfaces modified with the titanium dioxide under the influence of UV radiation.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-169-S-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Valence Band and Core Levels of $Ce_5Ni_2Si_3$ Crystal Studied by X-ray Photoemission Spectroscopy
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Chełkowska, G.
    Mihalik, M.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813673.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    82.80.Pv
    Opis:
    The crystal of $Ce_5Ni_2Si_3$ was prepared by the Czochralski method. The X-ray photoemission spectroscopy was measured for the valence band and the core levels. Based on the Ce(3d) doublet and its satellites a small value of the hybridization parameter of the f-states with the conduction electrons Δ=4 meV and the f-occupancy $n_f$ close to 1 were found. X-ray photoemission spectroscopy shows that the region between 0 and 3 eV is predominated by the Ni(3d) and Ce(4f) peaks. Some features of the multiplet structure of the Ce(4f) states are also visible close to the Fermi level.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 327-330
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entropy Change Calculations for Pure Gd and a Ni-Mn-Cu-Ga Heusler Alloy: Constant Field vs. Constant Temperature Experiment
    Autorzy:
    Ferenc, J.
    Kowalczyk, M.
    Wróblewski, R.
    Cieślak, G.
    Sielicki, K.
    Leonowicz, M.
    Kulik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402338.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Sg
    65.40.gd
    Opis:
    The magnetocaloric effect may be assessed indirectly by expressing it as the change in magnetic entropy in varying magnetic field, H, as the function of temperature, T. Magnetization, M=f(T,H), may be experimentally acquired from a series of isothermal measurements with variable field, or from a series of constant field measurements with variable temperature. The accuracy of magnetic entropy calculation depends on the number of series in these experiments. The aim of this work is to determine how little data is sufficient to obtain accurate results of magnetic entropy change calculations, on the basis of real, magnetocaloric materials. Pure gadolinium and a Ni-Mn-Cu-Ga Heusler alloy were studied. For both materials, the magnetic entropy change and relative cooling power were calculated from both experiments, with the decreasing number of experimental data. For both materials, the constant field experiment with only 6 field values provided only a 5% error of calculations, as compared to the experiment with 100 field values. The Arrott plots were also drawn for constant field mode with 6 field values, easily indicating the order of transition. Comparison of the calculation results suggests that the constant field mode magnetization measurement may be more accurate and faster than isothermal mode.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 111-115
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X-Ray Photoemission Spectra of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ Systems
    Autorzy:
    Szajek, A.
    Jezierski, A.
    Kowalczyk, A.
    Baszyński, J.
    Bartkowski, St.
    Neumann, M.
    Borstel, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955840.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.20.-b
    79.60.-i
    Opis:
    The electronic structure of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ compounds (Laves phase - MgCu$\text{}_{2}$, C15) for Al concentrations x = 0.0, 0.1, 0.2 was investigated by X-ray photoelectron spectroscopy. The results were compared with the ab initio band structure calculations.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 439-442
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence Decay in Deep Quantum Wells CdTe/Cd_{0.5}Mn_{0.5}Te at Room Temperature
    Autorzy:
    Kowalczyk, L.
    Fancey, S.
    Buller, G.
    Massa, J.
    Kutrowski, M.
    Janik, E.
    Karczewski, G.
    Wojtowicz, T.
    Zakrzewski, A.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876908.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    78.47.+p
    78.55.Et
    Opis:
    Time-resolved photoluminescence was used to study exciton recombination in deep CdTe/Cd_{0.5}Mn_{0.5}Te single quantum well. The width of the investigated well was 100 A. The study was performed at room temperature. The lifetime of the exciton determined in this work has a value comparable to that observed in shallow CdTe/Cd_{0.85}Mn_{0.15}Te quantum wells. A strong enhancement of the photoluminescence decay time with increasing intensity of the exciting laser beam is observed which is indicative of saturation of the non-radiative recombination centers.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 508-513
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Heavy Fermion and Spin-Glass Behavior to Magnetic Order in $CeT_4M$ Compounds
    Autorzy:
    Toliński, T.
    Kowalczyk, A.
    Falkowski, M.
    Synoradzki, K.
    Chełkowska, G.
    Hoser, A.
    Rols, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1426703.pdf
    Data publikacji:
    2012-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Lp
    71.27.+a
    75.30.Mb
    75.30.Cr
    75.50.Lk
    78.70.Nx
    Opis:
    We report on the transitions between the ferromagnetic order, spin-glass behavior, heavy fermion and fluctuating valence state in a series of isostructural compounds $CeT_4M$ (T = Ni, Cu; M = Al, Ga, Mn). The dilution of Ce or the T and M elements allowed us to follow the physical properties evolution employing the measurements of the heat capacity, dc magnetic susceptibility, frequency dependent ac magnetic susceptibility, magnetization relaxation, inelastic neutron scattering and also the X-ray photoemission spectroscopy. It is shown that the Mn rich compounds lean towards the spin glass behavior. For the compounds governed by the close to localization Ce 4f states the effect of the crystal electric field has been studied. It has been shown that the spin glass-like behavior can significantly influence the physics of the $CeT_4M$ compounds.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 5-6; 1014-1018
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity and Electronic Structure of the W$\text{}_{7}$Re$\text{}_{13}$B Compound
    Autorzy:
    Kowalczyk, A.
    Andrzejewski, B.
    Jezierski, A.
    Toliński, T.
    Szlaferek, A.
    Falkowski, M.
    Chełkowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046770.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    74.70.-b
    74.25.Ha
    74.25.Jb
    82.80.Pv
    Opis:
    The superconductor W$\text{}_{7}$Re$\text{}_{13}$B has been studied by the magnetic measurements and microwave absorption. The crystal structure of W$\text{}_{7}$Re$\text{}_{13}$B is cubic (β-Mn type). This compound exhibits a sharp superconducting transition at a temperature of T$\text{}_{c}$=7.2 K. The electronic structure of W$\text{}_{7}$Re$\text{}_{13}$B has been studied by X-ray photoelectron spectroscopy and the band structure has been calculated by the full-potential local-orbital minimum-basis method using the scalar-relativistic mode. The main contribution to the density of states at the Fermi level is from 5d electrons of W and Re. The W and Re bands are similar and substituting W by Re does not change the total density of states.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 597-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission SecondHarmonic Generation in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te at 1.064 µm
    Autorzy:
    Koziarska, B.
    Kowalczyk, L.
    Suchocki, A.
    Wojtowicz, T.
    Zakrzewski, A. K.
    Karczewski, G.
    Janik, E.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1873081.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.Ky
    68.70.+w
    Opis:
    Second harmonic generation, created by nanosecond Nd : YAG laser pulses at 1.064 µm with relatively low intensity in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te bulk crystals and thin layers was measured in transmission geometry. The effect practically occurs in a very thin surface layer of the material and it is used as a relatively straightforward method of layer quality characterization. It is shown that the angular dependence of the second harmonic generation intensity in thin layers of CdTe with good crystallographic (and optical) quality agrees very well with the theory in contrary to the samples with some distortions from the ideal structure which exhibits large distortions from the theory.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 423-426
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interlayer Exchange Coupling in Semiconductor EuS-PbS Ferromagnetic Wedge Multilayers
    Autorzy:
    Kowalczyk, L.
    Wrotek, S.
    Dziawa, P.
    Osinniy, V.
    Szot, M.
    Story, T.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Fedorov, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046924.pdf
    Data publikacji:
    2006-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Antiferromagnetic interlayer coupling between ferromagnetic layers of EuS via nonmagnetic PbS spacer layer was experimentally studied in EuS-PbS wedge multilayers grown on KCl (001) substrates with EuS thickness of 6 nm and PbS thickness varying in the wedges in the range 0.3-6 nm (i.e. n=1-20 monolayers). Measurements of magnetic hysteresis loops of EuS-PbS multilayers performed in the temperature range 5-30 K by superconducting (SQUID) and magneto-optical magnetometers revealed a rapid increase in saturation magnetic field in multilayers with PbS spacer thinner than about 1.5 nm. It shows a monotonic increase in interlayer coupling strength with a decreasing PbS spacer thickness, in qualitative agreement with 1/2$\text{}^{n}$ dependence predicted theoretically for semiconductor magnetic superlattices.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 2; 225-231
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of EuS-SrS Semiconductor Multilayer Structures
    Autorzy:
    Szot, M.
    Kowalczyk, L.
    Deptuła, P.
    Domukhovski, V.
    Osinniy, V.
    Smajek, E.
    Szczerbakow, A.
    Sipatov, A. Yu.
    Volobuev, V. V.
    Fedorov, A. G.
    Story, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047716.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.30.Et
    Opis:
    Magnetic and structural properties of EuS-SrS semiconductor multilayers were studied by SQUID and magneto-optical Kerr effect magnetometry techniques and by X-ray diffraction method. The multilayers composed of monocrystalline, lattice matched ferromagnetic EuS layers (thickness 35-50Å) and nonmagnetic SrS spacer layers (thickness 45-100Å) were grown epitaxially on KCl (001) substrates with PbS buffer layer. Ferromagnetic transition in EuS-SrS multilayers was found at the Curie temperature T$\text{}_{c}$=17 K. The multilayers exhibit only weak in-plane magnetic anisotropy with [110] easy magnetization axis. Coercive field of EuS-SrS multilayers shows a linear increase with decreasing temperature. Magneto-optical mapping of magnetic hysteresis loops of the multilayers revealed good spatial homogeneity of their magnetic properties.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 419-424
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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