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    Wyświetlanie 1-7 z 7
    Tytuł:
    Numerical studies on patterning of shear zone in granular bodies
    Autorzy:
    Tejchman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954556.pdf
    Data publikacji:
    2000
    Wydawca:
    Politechnika Gdańska
    Tematy:
    localisation
    hypoplasticity
    polar continuum
    boundary conditions
    shear zone
    finite element method
    Opis:
    The paper deals with numerical investigations on the patterning of shear zones in granular bodies. The behaviour of dry sand during plane strain compression tests was numerically modelled with a finite element method using a hypoplastic constitutive relation within a polar (Cosserat) continuum. The constitutive relation was obtained through an extension of a non-polar one by polar quantities, viz. rotations, curvatures, couple stresses using the mean grain diameter as a characteristic length. This relation can reproduce the essential features of granular bodies during shear localisation. The material constants can be easily determined from element test results and can be estimated from granulometric properties. The attention is laid on the influence of boundary conditions and the distribution of imperfections in the granular specimen on the formation of patterns of shear zones.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 485-516
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical applications of the multi-component marine photosynthesis model (MCM)
    Autorzy:
    Ficek, D.
    Majchrowski, R.
    Ostrowska, M.
    Kaczmarek, S.
    Wozniak, B.
    Dera, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48509.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    primary production
    quantum yield
    inorganic nitrogen
    temperate zone
    tropical zone
    practical application
    bio-optical modelling
    marine photosynthesis model
    marine alga
    polar zone
    photosynthesis
    Opis:
    This paper describes the applications and accuracy analyses of our multi-component model of marine photosynthesis, given in detail in Woźniak et al. (2003). We now describe an application of the model to determine quantities characterising the photosynthesis of marine algae, especially the quantum yield of photosynthesis and photosynthetic primary production. These calculations have permitted the analysis of the variability of these photosynthesis characteristics in a diversity of seas, at different seasons, and at different depths. Because of its structure, the model can be used as the ‘marine part’ of a ‘satellite’ algorithm for monitoring primary production in the sea (the set of input data necessary for the calculations can be determined with remote sensing methods). With this in mind, in the present work, we have tested and verified the model using empirical data. The verification yielded satisfactory results: for example, the statistical errors in estimates of primary production in the water column for Case 1 Waters do not exceed 45%. Hence, this model is far more accurate than earlier, less complex models hitherto applied in satellite algorithms.
    Źródło:
    Oceanologia; 2003, 45, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of heterogeneity on shear zone formation during plane strain compression
    Autorzy:
    Tejchman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241506.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    heterogeneity
    mean grain diameter
    polar continuum
    shear zone
    void ratio
    Opis:
    Heterogeneity of granular materials triggers shear zone formation. In the paper, the FE-analysis of the effect of the material heterogeneity on the formation of a spontaneous shear zone inside of granular materials during a plane strain compression test is presented. The numerical calculations are performed with a finite element method on the basis of a hypoplastic constitutive law extended by polar quantities: rotations, curvatures and couple stresses. A mean grain diameter is used as a characteristic length. The constitutive law takes into account the effect of pressure, void ratio, direction of deformation rate and mean grain diameter on the behaviour of granular bodies. The heterogeneity in the granular body is assumed in the form of spots with a different initial void ratio. The spots are single or distributed randomly and stochastically with an exponential probability function. The single spots are distributed sparsely and densely in an initially dense and loose granular specimen. Special attention is focused on the effect of heterogeneity on the onset of shear localization and its thickness at residual state.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 149-181
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The attractiveness of polar regions as the zones of silence
    Autorzy:
    Mamzer, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079050.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    polar region
    attractiveness
    silence zone
    natural specificity
    isolation
    anthropopressure
    tourism
    Opis:
    Post-modern societies are characterized by information-based functions that gen- erate the anthropogenic stimuli (as opposed to the industrial society of energy processing and the traditional society whose activities are related to the production of natural crops). Hence, life in the information overload becomes a tiresome daily reality, from which only a very few may escape. These escapers might be regarded as consumers of the new type of ‘luxury goods’ such as: silence experiencing and positively valorized solitude allowing deeper insight into one- self. The polar regions provide an opportunity to withdraw from the anthropogenic noise of the civilization. I do believe that it is one of the most significant drivers of the increasing popularity of traveling to these regions of the world.
    Źródło:
    Oceanologia; 2020, 62, 4PB; 557-564
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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