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    Wyświetlanie 1-4 z 4
    Tytuł:
    Superconducting Properties of BiPbSrCsCuO and BiSrCaCuO Glass-Ceramics
    Autorzy:
    Miller, W.
    Borówko, K.
    Gazda, M.
    Stizza, S.
    Natali, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046791.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Hs
    72.80.Ng
    Opis:
    In this work we study the main differences between the superconducting properties of the Bi$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ and (Bi$\text{}_{0.8}$Pb$\text{}_{0.2}$)$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ glass-ceramics. The Bi$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ and (Bi$\text{}_{0.8}$Pb$\text{}_{0.2}$)$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ glass-ceramics prepared in the same conditions contain similar amounts of the superconducting 2212 phase, however their superconducting and normal-state electrical properties differ significantly. The main reason which makes BiSrCaCuO glass-ceramics worse superconductor than BiPbSrCaCuO is its microstructure.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 627-631
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of Hough technique in surgery of otosclerosis, using the finite element method
    Autorzy:
    Gentil, F.
    Parente, M.
    Martins, P.
    Santos, C.
    Almeida, E.
    Ferreira, A.
    Natali, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/307201.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metoda elementów skończonych
    otoskleroza
    wycięcie strzemiączka
    strzemiączko
    finite element method
    otosclerosis
    stapedectomy
    stapedotomy
    stapes
    Opis:
    Purpose: Otosclerosis is a metabolic bone disease of the otic capsule that can cause the stapes fixation, resulting in conductive hearing loss or, in a profound sensorineural deafness threshold. Surgery is one of the possible treatments for the otosclerosis. To repair small focus of otosclerosis in the anterior crus of the stapes, in 1960, Hough suggested the implementation of a technique in which part of the anterior crus is fractured and the stapes turned. As a result, the posterior crus of the stapes is the only connection with the inner ear. In this work, the outcome of Hough’s surgical technique was simulated. Methods: Based on computerized images, a finite element model of middle ear ossicles and tympanic membrane was created, as well as a model where the stapes has changed. The discretization of the tridimensional solid model was made using the ABAQUS software. The mechanical properties used were taken from the literature and adequate boundary conditions were applied. Results: The results obtained with the Hough technique simulation were compared with a representative model of the normal ear, taking into account the displacements obtained on the central part of the stapes footplate and the maximum principal stress in the stapes crus. Conclusions: The results obtained are closer to the normal ear model, therefore Hough technique stands out as a good option to correct small focus of otosclerosis.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 149-153
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conductivity and Superconductivity of (Bi,Pb)$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ Glass-Ceramics
    Autorzy:
    Gazda, M.
    Kusz, B.
    Stizza, S.
    Chudinov, S.
    Natali, R.
    Piętosa, J.
    Bienias, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038390.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Hs
    72.80.Ng
    Opis:
    In the (Bi,Pb)-Sr-Ca-Cu-O system, materials of various electrical and superconducting properties may be produced by a glass-ceramic method. Phase composition, structure, microstructure and also electrical properties of the material change as a result of heat treatment. Depending on the heat treatment conditions, either a superconductor with the critical temperature between 8 and 105 K or material without a superconducting transition may be obtained. The properties of the material change so much because during annealing three oxide superconductors belonging to the bismuth family are formed. (Bi$\text{}_{0.8}$Pb$\text{}_{0.2}$)$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ glass was prepared by a standard technique of quenching homogenized and melted substrates. The glass-ceramic samples were obtained by annealing of the glass beneath melting temperature. Structure and microstructure of glass-ceramic samples were studied with scanning electron microscopy and X-ray diffraction method. Superconducting properties were studied by means of electrical conductivity and magnetization measurements. In this paper we present the influence of the phase composition, structure and microstructure on the electrical conductivity in the normal state and the superconducting properties of (Bi,Pb)$\text{}_{4}$Sr$\text{}_{3}$Ca$\text{}_{3}$Cu$\text{}_{4}$O$\text{}_{x}$ glass-ceramics.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 617-625
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting Transition in Granular Bi-Sr-Ca-Cu-O Superconductors
    Autorzy:
    Gazda, M.
    Kusz, B.
    Sadowski, W.
    Stizza, S.
    Natali, R.
    Di Stasio, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046731.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.-c
    74.81.Bd
    74.72.Hs
    Opis:
    In this work we study the superconducting transition in the samples containing relatively small granules of high-T$\text{}_{c}$ Bi-Sr-Ca-Cu-O superconductors. The samples were obtained by the glass-ceramic technology. Two-stage character of the superconducting transition was studied. Pairing transition temperature depends on the magnetic field. Coherence transition is very sensitive to the current flowing through the sample, magnetic field and the phase composition and microstructure of the sample. The analysis of superconducting transition by means of the logarithmic derivative of the fluctuation conductivity shows the mesoscopic granularity of the samples.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 485-491
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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