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    Wyświetlanie 1-11 z 11
    Tytuł:
    Crystallization of Amorphous Ribbon Observed by Means of Scanning Tunneling Microscope
    Autorzy:
    Witek, A.
    Reich, A.
    Raułuszkiewicz, J.
    Zych, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929178.pdf
    Data publikacji:
    1993-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Bs
    68.55.Jk
    75.50.Kj
    Opis:
    Surfaces of amorphous ribbon Fe70V10 B20 were observed by means of the scanning tunneling microscope before and after the annealing in vacuum. The topographic images of the air-side surfaces after annealing are similar in the x-y plane and different in the z-direction. From the scanning tunnelling microscope images some information on the crystallization of amorphous ribbons can be deduced.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 4; 463-467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Experimental Investigation of Electrical Conductivity of Y₃Al₅O₁₂-Ethylene Glycol Nanofluids
    Autorzy:
    Fal, J.
    Witek, A.
    Gizowska, M.
    Cholewa, M.
    Żyła, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032441.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.F-
    72.15.Cz
    72.60.+g
    73.63.-b
    Opis:
    Paper presents results of experimental studies of electrical conductivity of yttrium aluminum garnet-ethylene glycol (Y₃Al₅O₁₂-EG, YAG-EG) nanofluids, which were prepared by dispersing commercially available nanoparticles manufactured by Baikowski (Annecy, France, ID LOT: 18513) in ethylene glycol. The electrical conductivity was measured using conductivity meter MultiLine 3410 (WTW GmBH, Weilheim, Germany). In turn the temperature was stabilized in a water bath MLL 547 (AJL Electronic, Cracow, Poland). The electrical conductivity of YAG-EG nanofluids with various mass concentrations form 5% to 20% was investigated at different ambient temperatures. The experimental data indicate that changing volume fraction of YAG nanoparticles in ethylene glycol cause change of electrical conductivity of nanofluid. It was also presented that electrical conductivity depends on temperature of materials.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 149-151
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Properties of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids
    Autorzy:
    Fal, J.
    Żyła, G.
    Gizowska, M.
    Witek, A.
    Cholewa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402557.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Jc
    72.15.Cz
    72.60.+g
    73.61.At
    Opis:
    Nanofluids are suspensions of nanometrical size particles in a liquid base, which is usually water, oil or ethylene glycol. The potential practical use of nanofluids caused in recent years a considerable intensification of research into their properties. The most widely studied of physical properties include the fluid rheology, thermal conductivity and electrical parameters. The paper presents electrical properties of aluminium oxide (Al₂O₃) nanofluids based on ethylene glycol (EG). Nanoparticles used to produce nanosuspensions employed in measurements have size between 100-300 nm. Electrical properties was investigated in a wide range of temperatures (-10°C-55°C) and frequencies (0.02-200 kHz) using a measuring LCR bridge connected to a temperature stabilization system based on liquid nitrogen and Peltier element.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 153-155
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface of BiSrCaCuO Single Crystal Observed by Means of Scanning Tunneling Microscope
    Autorzy:
    Witek, A.
    Reich, A.
    Czajka, R.
    Pajączkowska, A.
    Rauluszkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1891851.pdf
    Data publikacji:
    1991-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Vy
    61.16.Di
    68.35.Bs
    Opis:
    The topographic images of a Bi$\text{}_{0.7}$Pb$\text{}_{0.3}$SrCaCu$\text{}_{1.8}$O$\text{}_{x}$ single crystal were studied by means of the scanning tunneling microscope. The structure of terraces and steps seen on the surface reflects the crystallographic structure of bulk.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 5; 717-722
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Viscosity of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids
    Autorzy:
    Żyła, G.
    Fal, J.
    Gizowska, M.
    Witek, A.
    Cholewa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402591.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    83.10.Pp
    83.50.Ax
    83.60.Fg
    83.60.Rs
    83.80.Hj
    Opis:
    The paper presents the results of measurements of rheological properties of ethylene glycol (EG) based aluminum oxide (Al₂O₃) nanofluids. The nanofluids have been produced by two-step method with the use of commercially available nanoparticles. Dynamic viscosity curves and dependence of viscosity on temperature for these materials have been measured. It has shown that with higher concentration of nanoparticles in the suspension, these nanofluids exhibit the non-Newtonian flow and it can be considered as shear-thinning liquids. The effect of temperature on the dynamic viscosity in Al₂O₃-EG nanofluids can be modelled with the use of Vogel-Fulcher-Tammann expression.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2; 240-242
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Fully Computerized Scanning Tunnelling Microscope
    Autorzy:
    Chwiałkowski, M.
    Klusek, Z.
    Kobierski, P.
    Olejniczak, W.
    Sławski, M.
    Witek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929317.pdf
    Data publikacji:
    1993-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.80.+x
    Opis:
    A new, fully computerized and inexpensive, scanning tunnelling microscope was designed and built. Its key design feature is the application of the high sensitivity bimorph, for the coarse positioning of the bimorph is > 0.03 mm and can be divided up to the 12 bit number of steps. The bimorph positioning implies that this microscope is fully computer controlled, and using of bimorph instead of inch-worm implies low cost of the unit. The microscope can create images of the surface in the constant current mode and in the imaging current mode. The presented microscope works with the z-axis analog or digital feedback loop optionally. All parameters of the analog and digital feedback loop are computer controlled. Due to the digital z-axis feedback loop benefits, electron tunneling spectroscopy mode is naturally accessible. The performance of the microscope was tested in air by imaging of surface of HOPG (high oriented pyrolytic graphite).
    Źródło:
    Acta Physica Polonica A; 1993, 83, 5; 621-628
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in ErFe$\text{}_{1-x}$Al$\text{}_{x}$O$\text{}_{3}$ System (x ≤ 0.1)
    Autorzy:
    Bombik, A.
    Pacyna, A. W.
    Witek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929847.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.60.–d
    Opis:
    The magnetic measurements for some representatives of ErFe$\text{}_{1-x}$Al$\text{}_{x}$O$\text{}_{3}$ system were performed. The obtained results indicate an essential influence of nonmagnetic substitution on physical behaviour of examined compounds.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 263-266
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dependence of Tin Whisker Growth on Copper and Oxygen Content on the Surface of Tin-Rich Lead Free Alloys
    Autorzy:
    Skwarek, A.
    Witek, K.
    Pluska, M.
    Czerwinski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399972.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    68.70.+w
    68.37.Hk
    Opis:
    The introduction of lead-free technology into electronics has intensified concern over tin whiskers phenomenon. Tin whiskers are crystals growing from the alloy surface as the result of compressive stress relaxation. This paper presents the dependence of tin whisker growth on copper and oxygen surface content. The observations and measurements were done using scanning electron microscopy with energy-dispersive X-ray spectroscopy. The results show that whisker growth is strongly related to increased copper and oxygen surface content in whisker neighborhood.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 430-431
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multilayer Perovskite-Based Thermistors Fabricated by LTCC Technology
    Autorzy:
    Kulawik, J.
    Szwagierczak, D.
    Witek, K.
    Skwarek, A.
    Gröger, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399976.pdf
    Data publikacji:
    2013-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.32.Ff
    81.05.Mh
    85.40.Xx
    Opis:
    In this work, single-phase $La_{0.7}Sr_{0.3}Zr_{0.5}Co^{2+}_{0.2}Co^{3+}_{0.3}O_3$ and $La_{0.8}Sr_{0.2}Ti_{0.5}Co^{2+}_{0.3}Co^{3+}_{0.2}O_3$ ceramics with the stable perovskite structure were utilized for fabrication of multilayer negative temperature coefficient thermistors. The number and thicknesses of ceramic layers were adjusted to attain suitable resistances in a desired temperature range. Scanning electron microscopy studies revealed a dense, fine-grained microstructure of ceramic layers, lack of delaminations and cracks at ceramic layer-conductive layer boundaries and a good cooperation with conductive layers. The temperature coefficients of resistance of the fabricated multilayer thermistors were changing from - 13 to - 1%/K in the temperature range from - 55 to 400C.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 2; 436-438
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-Resolved Studies of Gallium Nitride Doped with Gadolinium
    Autorzy:
    Witek, B.
    Wysmołek, A.
    Kamińska, M.
    Twardowski, A.
    Potemski, M.
    Boćkowski, M.
    Grzegory, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812021.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    75.50.Pp
    71.55.-i
    71.35.Ji
    Opis:
    Time-resolved photoluminescence experiments on high quality bulk GaN doped with Gd are presented. It was found that the decay time of Gd-related transitions observed for 4.2 K around 1.78 eV is of about 3 ms. Such a long decay time strongly supports the identification of this emission band as due to transitions between Gd³+(4f⁷) levels. The decay time measured for Gd-related transitions observed in the UV spectral range, close to the GaN band-gap, was found to be much faster than 1 μs. This suggests that these emission lines could hardly be correlated with internal transitions within Gd³+(4f⁷). Possible origin of the Gd-related UV luminescence is discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1425-1430
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Liquid Crystals for Molecular Spintronics
    Autorzy:
    Szczytko, J.
    Budzowski, P.
    Turski, H.
    Witek, B.
    Twardowski, A.
    Glebowska, A.
    Krówczyński, A.
    Pociecha, D.
    Szydlowska, J.
    Górecka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811993.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.Ck
    75.50.Xx
    Opis:
    The magnetic properties of Ni(II) and Cu(II) complexes were measured. In the case of Ni(II) samples strong enhancement of the magnetic susceptibility below 23 K was observed. The model of structural transition was proposed to explain this behavior.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1383-1386
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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