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    Wyświetlanie 1-10 z 10
    Tytuł:
    Magnetic Properties of YBCO-PST Composites
    Autorzy:
    Andrzejewski, B.
    Kaczmarek, A.
    Stankowski, J.
    Hilczer, B.
    Marfaing, J.
    Régnier, S.
    Caranoni, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014556.pdf
    Data publikacji:
    2000-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.80.Bj
    74.25.Ha
    76.30.Fc
    Opis:
    The magnetic properties of granular superconductor-insulator composites were investigated. The composites were random composition of the YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (YBCO) high-temperature superconductor and Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$ (PST) ferroelectric insulator. The composites exhibited lower superconducting volume ratio than the YBCO content. For samples with YBCO content low enough no global (the whole sample) and local (separated grains) superconductivity was observed. The observed decay of the superconductivity, lowering of the critical temperature, and the increase in number of paramagnetic centres as PST content increases are explained assuming reaction among YBCO and PST phases and possible formation of an additional ones, which did not exist in the initial powders.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 6; 739-746
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Aspects of Photochromism of the Internally H-Bonded Schiff Bases. "A Minimal Chromophore"
    Autorzy:
    Grabowska, A.
    Kownacki, K.
    Kaczmarek, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943895.pdf
    Data publikacji:
    1995-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.10.-n
    33.50.-j
    Opis:
    The final limiting stage of structural simplification of photochromic Schiff base was reached by the following statement: two molecules, salicylidene methylamine and its butyl analogue, show transient absorption bands (at room temperature) peaking at ≈ 22000 cm$\text{}^{-1}$. These bands are characteristic of the phenomenon of photochromism. They are similar to the corresponding spectra detected earlier for several larger, symmetric systems belonging to the same family. Experimental characterization of both molecules was compared with the theoretical calculations: geometry optimization and transition energies, performed for enol, keto, and the photochromic form of salicylidene methylamine.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 6; 1081-1088
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Waves in Magnetic Liquids: Two-Phase Approach and Experimental Results
    Autorzy:
    Kaczmarek, M.
    Hornowski, T.
    Skumiel, A.
    Łabowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013251.pdf
    Data publikacji:
    2000-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.35.+i
    75.50.-y
    62.60.+v
    Opis:
    A two-phase model of dynamical behavior of magnetic liquid influenced by constant magnetic field is considered. The model takes into account mutual interaction of clusters giving skeleton's stiffness and interaction of clusters with free liquid producing attenuation and dispersion of waves for transversally isotropic system. Rotational degrees of freedom are disregarded. Predictions of the model are discussed for variable amount of clusters and compared with experimental data for different magnetic fields.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 4; 639-649
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Study of Nanocrystalline TiB₂, TiC, B₄C Powders Doped to AISI 316L Austenitic Steel
    Autorzy:
    Bodziony, T.
    Kaczmarek, S.
    Biedunkiewicz, A.
    Leniec, G.
    Figiel, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032403.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.55.Jg
    75.20.-g
    75.50.-y
    75.50.Bb
    76.30.-v
    Opis:
    The investigations into ferromagnetic resonance and magnetic susceptibility of nanocrystalline TiB₂, TiC, and B₄C powders (Ti-B-C system) doped to AISI 316L austenitic steel with different amounts (3 vol.%, 5 vol.% and 7 vol.%) have been carried out. The ferromagnetic resonance spectra were recorded in the temperature range from helium up to room temperature. The three tested composite samples contain a number of magnetic phases in different proportions. They reveal a structure originating from several different complex magnetic centers. The composites revealed such magnetic phenomena as paramagnetism, (anti)ferromagnetism, and superparamagnetism. Magnetic susceptibility investigations supported the ferromagnetic resonance studies and their analysis. Magnetic properties of the TiB₂, TiC, B₄C powders doped to AISI steel may play important role in further possible applications of these composite systems.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 62-68
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth and Optical Properties of Li$\text{}_{2}$B$\text{}_{4}$O$\text{}_{7}$ Single Crystals Pure and Doped with Yb, Co and Mn Ions for Nonlinear Applications
    Autorzy:
    Podgórska, D.
    Kaczmarek, S. M.
    Drozdowski, W.
    Berkowski, M.
    Worsztynowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042117.pdf
    Data publikacji:
    2005-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Bs
    42.70.Mp
    81.10.Fq
    Opis:
    The paper reports on the growth conditions of Li$\text{}_{2}$B$\text{}_{4}$O$\text{}_{7}$ single crystals in both pure and Yb, Co, Mn doped systems. The crystals were grown by the Czochralski method using an intentional concentration of the above-mentioned ions at a level of 0.5 mol.%. The pure and Mn-doped crystals were found to be highly transparent and clear. The crystals doped with Yb$\text{}_{2}$O$\text{}_{3}$ had a lot of precipitations making them opaque. The Co-doped crystals were purple-blue in colour and highly transparent. The growth of Yb and Co doped Li$\text{}_{2}$B$\text{}_{4}$O$\text{}_{7}$ crystals was reported for the first time in this paper. Absorption was measured in the range of 200 to 3200 nm, moreover analysis of changes in the absorption spectrum ofγ-irradiated pure and doped Li$\text{}_{2}$B$\text{}_{4}$O$\text{}_{7}$ crystals was performed. Some thermoluminescence properties were measured, e.g. energies and lifetimes of the traps of different charge carriers occurring in the crystals at low temperatures.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 3; 507-518
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Kinetics of YAG Crystals Activated with Ce, and Ce and Mg
    Autorzy:
    Barzowska, J.
    Kubicki, A.
    Grinberg, M.
    Kaczmarek, S.
    Łuczyński, Z.
    Wojtowicz, A. J.
    Koepke, Cz.
    Powiązania:
    https://bibliotekanauki.pl/articles/1995826.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.-i
    78.47.+p
    78.55.-m
    Opis:
    A basic spectroscopic measurements of luminescence, absorption, luminescence excitation spectra and emission kinetic measurements on YAG crystals activated with cerium and magnesium are presented. We report that the Ce$\text{}^{3+}$ luminescence decay constant, at 65 ns, is independent of Ce concentrations (from 0.05 to 0.2%) and that it does not change with the presence or absence of the Mg co-dopant. Nevertheless, we find that under pulsed laser excitation at 290 nm the rise time in Ce luminescence time profiles is effectively shorter in the Mg co-doped samples.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 395-402
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Ultrasonic and Magnetic Hyperthermia on the Concentration of Magnetic Nanoparticles
    Autorzy:
    Kaczmarek, K.
    Hornowski, T.
    Bielas, R.
    Żak, D.
    Timko, M.
    Józefczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030383.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.-c
    43.35.Cg
    43.35.Wa
    87.85.-d
    Opis:
    Hyperthermia treatment is the heating of tumor tissue up to temperatures between 41°C and 45°C, which trigger several physiological reactions in the body. Hyperthermia within tissue can be applied through various mechanisms. One of them is magnetic hyperthermia which uses superparamagnetic iron oxide nanoparticles (SPIONs) heated by an externally applied magnetic field. SPIONs can also be used as sonosensitizers in ultrasound hyperthermia increasing acoustic wave attenuation. The impact of SPION concentration on thermal effect during ultrasonic and magnetic hyperthermia was investigated in agar-gel phantom with added magnetite nanoparticles. The presence of nanoparticles in the tissue-mimicking phantom increases the thermal losses of ultrasound energy and temperature of the phantom.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 716-718
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibility of Gamma-Induced Sensibilization Process in Rare-Earth Doped Yag Crystals
    Autorzy:
    Kaczmarek, S.
    Matkovskii, A. O.
    Mierczyk, Z.
    Kopczyński, K.
    Sugak, D. Yu.
    Durygin, A. N.
    Frukacz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945610.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Ji
    61.80.Ed
    78.20.Dj
    Opis:
    The influence of gamma irradiation on optical and lasing properties of Nd:YAG, Er:YAG and CTH:YAG single crystals was studied. The increase in optical output was established for rods without thermal annealing. The possible mechanisms of radiation sensibilization are discussed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 285-293
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Excited State Absorption and Thermoluminescence in Ce and Mg Doped Yttrium Aluminum Garnet
    Autorzy:
    Wiśniewski, K.
    Koepke, Cz.
    Wojtowicz, A. J.
    Drozdowski, W.
    Grinberg, M.
    Kaczmarek, S. M.
    Kisielewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007834.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Hx
    78.55.-m
    78.60.Kn
    73.50.Gr
    29.40.Mc
    78.20.-e
    78.20.Wc
    78.40.-q
    Opis:
    In this paper we report preliminary results of optical studies on Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG) crystals codoped with Ce and Mg. By using measurements of luminescence, absorption, and luminescence excitation spectra we demonstrate that although the basic features introduced to the YAG host by the Ce-doping remain intact, the Mg-codoping imposes some significant changes on other properties of the material. These changes are potentially important for laser and/or scintillator applications of YAG:Ce and are due, most likely, to modifications of defect populations in the material. We characterize them by using the techniques of thermoluminescence and excited state absorption under excimer laser pumping. These techniques, interestingly, yield results that seem inconsistent. While the thermoluminescence signal of the Mg-doped sample is strongly reduced, suggesting that trap concentrations in the presence of Mg are suppressed, the excited state absorption signal, which we also relate to the traps, is higher. We offer a tentative explanation of this contradiction between the two experiments that involves a massive transfer of electrons from the Mg-related defects to the excited state absorption centers caused by the excimer pump itself.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 403-412
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    UV and Gamma Irradiation Effect in Spectroscopic and Lasing Properties of Er$\text{}^{3+}$ doped Yttrium-Aluminium Garnet, Yttrium Orthoaluminate and Lithium Niobate Crystals
    Autorzy:
    Kaczmarek, S.
    Pracka, I.
    Mierczyk, Z.
    Kopczyński, K.
    Piramidowicz, R.
    Malinowski, M.
    Kisielewski, J.
    Matkovskii, A.
    Sugak, D. Yu.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945656.pdf
    Data publikacji:
    1996-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.Hj
    61.72.Ji
    78.20.Dj
    Opis:
    Optical features (absorption and luminescence spectra) for Er$\text{}^{3+}$ doped yttrium-aluminium garnet (YAG), yttrium orthoaluminate (YAP) and LiNbO3 crystals as well as their changes after UV and gamma irradiations are presented. Possibility of gamma-induced sensibilization process in Er$\text{}^{3+}$ doped crystals is discussed. Positive result for non-pre-annealed gamma-irradiated rods of Er$\text{}^{3+}$:YAG crystal was stated.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 2; 411-418
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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