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    Wyświetlanie 1-4 z 4
    Tytuł:
    The application of silo centrifuge testing
    Autorzy:
    Grossstück, M.
    Schwedes, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955776.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Gdańska
    Tematy:
    silo design
    moist bulk solids
    silo-centrifuge
    scale-up
    model tests
    Opis:
    Common problems of industrial silo design can be solved with the use of the Jenike method. The Jenike method is an established procedure to investigate the critical outlet dimensions of a silo and the flow profile. However, in some cases the Jenike method is assumed to lead to overdesign, especially when silo design is calculated for highly dispersed bulk solids in the nano range or if the bulk solid contains moisture. Another way to determine the critical outlet dimension of a silo is a model test. We then have to consider the boundary conditions, i.e. the particle size, and a possible size reduction of the model silo, which is only possible in a centrifugal field using cohesive bulk solids. In this work, results of experiments in a silo centrifuge regarding scale-up are presented. The experiments have been performed to investigate the critical outlet dimension for a silo for very fine and moist bulk solids.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 4; 549-560
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New kind of parameterization applied to the Fermi surface of a crystalline solid. Part I: Electron observables and curvature parameters examined on the surface
    Autorzy:
    Olszewski, S.
    Roliński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943222.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Fermi surfaces of crystalline solids
    electron orbits induced in the magnetic field
    curvature properties of the Fermi surfaces
    Opis:
    A magnetic field applied to a crystalline solid causes the electron states on the Fermi surface to circulate along the orbits located on the planes normal to the applied field. For a sufficiently weak field the separate orbits can cover the whole closed Fermi surface. A suitable parameterization of the states on the orbits should be done in a different way than a conventional parameterization applied for the electron states by Bloch. This new kind of parameterization becomes quite simple when the magnetic field is assumed to be directed parallel to one of the crystallographic axes. Computationally, a new description of the electron states on the Fermi surface becomes on many occasions more flexible in its use than the Bloch's one. The simplifications concern mainly an examination of the curvature parameters of the Fermi surface and extremal properties of the electron observables, for example that of electron velocity. Solely the states in the cubic crystal lattices were considered as examples.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 1-2; 99-115
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo simulation of dispersive carrier transport in disordered solids in the presence of space charge effects
    Autorzy:
    Tomaszewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954064.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Monte Carlo simulations
    Monte Carlo methods
    dispersive carrier transport
    disordered solids
    space charge effects
    multiple-trapping carrier transport
    MT transport equations
    Opis:
    A Monte Carlo (MC) method of simulation of the multiple-trapping (MT) carrier transport in disordered solids, taking into account the space charge effects, is presented. The main idea is to utilize the ordered binary bees for the storage of sequences of the carrier positions and release times. An exemplary implementation of the MC method in the case of isothermal surface-potential decay is described. Also, modifications of the algorithm for other experimental configurations are indicated. The preliminary simulation results are compared with the approximate solutions of MT transport equations.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 19-29
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New kind of parameterization applied to the Fermi surface of a crystalline solid. Part II: Density of states and lengths of arcs calculated as a check of the theory
    Autorzy:
    Roliński, T.
    Olszewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943221.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska
    Tematy:
    Fermi surfaces of crystalline solids
    electron orbits induced in the magnetic field
    density of electron states
    orbit lengths and arc lengths on the Fermi surfaces
    Opis:
    In order to check the validity of parameterization of electron states on the Fermi surfaces developed in the preceding paper, this parameterization is applied to the calculation of some definite crystal properties. The first property is the density of electron states versus energy in simple cubic and body-centered cubic crystal lattices, examined formerly on the basis of the Bloch parameterization of electron states by Jelitto; the other property is the length of some special arcs extended on the surfaces. The parameterizations of both approaches, that of the present paper and that developer on the basis of the Bloch states, are found to give results remaining in remarkable agreement.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2009, 13, 1-2; 117-131
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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