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    Wyświetlanie 1-6 z 6
    Tytuł:
    Finite element analysis of airfield flexible pavement
    Autorzy:
    Leonardi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/230966.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    uderzenie
    metoda elementów skończonych
    nawierzchnia lotniskowa
    lądowanie samolotu
    Abaqus
    nawierzchnia elastyczna
    impact
    finite element method
    airfield pavement
    aircraft landing
    ABAQUS
    flexible pavement
    Opis:
    The paper presents a numerical study of an aircraft wheel impacting on a flexible landing surface. The proposed 3D model simulates the behaviour of flexible runway pavement during the landing phase. This model was implemented in a finite element code in order to investigate the impact of repeated cycles of loads on pavement response. In the model, a multi-layer pavement structure was considered. In addition, the asphalt layer (HMA) was assumed to follow a viscoelastoplastic behaviour. The results demonstrate the capability of the model in predicting the permanent deformation distribution in the asphalt layer.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 3; 323-334
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite element analysis for airfield asphalt pavements rutting prediction
    Autorzy:
    Leonardi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/202455.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Keywords
    asphalts
    FEM
    airfield pavement
    aircraft landing
    viscoelasticity
    creep
    asfalt
    nawierzchnia lotniska
    lądowanie statku powietrznego
    lepkosprężystość
    pełzanie
    Opis:
    This paper presents a numerical study of an aircraft wheel impacting on a flexible pavement. The proposed three dimensional model simulates the behaviour of flexible runway pavement during the landing phase. This model was implemented in a finite element code in order to investigate the impact of repeated cycles of loads on pavement permanent deformation. In the model a traditional multi-layer pavement structure was considered. In addition, the asphalt layer (HMA) was assumed to follow an elasto-viscoplastic behaviour. The results demonstrate the capability of the model in predicting the permanent deformation distribution in the asphalt layer.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 397-403
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fractal dimension for the characterization of the porosity of asphalt concretes
    Autorzy:
    Leonardi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/231336.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    geometria fraktalna
    porowatość
    mieszanka
    kruszywo
    beton asfaltowy
    nawierzchnia
    fractal geometry
    porosity
    mixture
    aggregate
    asphalt concrete
    pavement
    Opis:
    In the design of asphalt mixtures for paving, the choice of components has a remarkable importance, as requirements of quality and durability must be assured in use, guaranteeing adequate standards of safety and comfort. In this paper, an approach of analysis on the aggregate materials using fractal geometry is proposed. Following an analytical and an experimental approach, it was possible to find a correlation between characteristics of the asphalt concrete (specific gravity and porosity) and the fractal dimension of the aggregate mixtures. The studies revealed that this approach allows to draw the optimal fractal dimension and, consequently, it can be used to choose an appropriate aggregate gradation for the specific application; once the appropriate initial physical parameters are finalized. This fractal approach could be employed for predicting the porosity of mixed asphalt concretes, given as input the fractal characteristics of the aggregate mixtures of the concrete materials.
    Źródło:
    Archives of Civil Engineering; 2010, 56, 4; 321-333
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological aspects of international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia
    Autorzy:
    Cardellini, F.
    Chiaberto, E.
    Garlati, L.
    Giuffrida, D.
    Leonardi, F.
    Magnoni, M.
    Minchillo, G.
    Prandstatter, A.
    Serena, E.
    Trevisi, R.
    Tripodi, R.
    Veschetti, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146585.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    active monitors
    calibration
    intercomparison
    radon
    Opis:
    In 2014, an intercomparison exercise of passive radon detectors under field conditions in the Marie Curie’s tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy) has been held. Radon activity concentration in the tunnel was measured with six radon active monitors, previously calibrated at ENEA-INMRI facilities. In the present paper, a synthesis of the metrological aspects of the intercomparison is given. Indeed particular attention was paid to metrological characterization of radon monitors and their response upon ambient conditions. Correction factors have been defined to be applied when measurements are performed in severe environmental conditions. In particular, it has been found that monitors are particularly sensitive to the effect of air density: the AlphaGUARD (AG-SAPHYMO, GmbH) effi ciency decreases with the air density, while for the MR1 PLUS (Tesys, Italy), the opposite applies. When the reference monitors were placed into the Marie Curie’s tunnel, to the recorded average radon concentrations correction factors were applied. After the correction the difference between data coming from AG and MR1 PLUS is within the 1.7%.
    Źródło:
    Nukleonika; 2016, 61, 3; 257-261
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Main results of the international intercomparison of passive radon detectors under field conditions in Marie Curie’s tunnel in Lurisia (Italy)
    Autorzy:
    Cardellini, F.
    Chiaberto, E.
    Garlati, L.
    Giuffrida, D.
    Leonardi, F.
    Magnoni, M.
    Minchillo, G.
    Prandstatter, A.
    Serena, E.
    Trevisi, R.
    Tripodi, R.
    Veschetti, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146811.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    in-field conditions
    intercomparison
    passive detectors
    radon
    Opis:
    In recent years a large number of radon intercomparison exercises has been organized; most of them took place in radon chambers, in reference atmosphere of the parameter to control (i.e. radon gas) under temperature, humidity and atmospheric pressure stable conditions. In 2014, in the tunnel belonging to the Lurisia spas complex (Lurisia, Piedmont, Italy), with natural high concentrations of uranium and radon gas, an intercomparison exercise has been held to give to radon measurement services and laboratories the possibility to test their passive systems under field conditions, which are less controlled and much more challenging. The response of laboratories was very positive: 46 participants from 10 European countries and 3 non-European countries. Generally about 80% of results of participants were considered acceptable even if it was observed a global trend of a substantial underestimation of the actual radon concentration.
    Źródło:
    Nukleonika; 2016, 61, 3; 251-256
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Induced Delocalization of Excitons in Ternary Compounds of II-VI and III-V Semiconductors
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Khachapuridze, A.
    Yatsunenko, S.
    Wojtowicz, T.
    Karczewski, G.
    Bergman, J. P.
    Monemar, B.
    Shamirzaev, T.
    Zhuravlev, K.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035757.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    72.25.Rb
    76.70.Hb
    78.55.Et
    Opis:
    In this work we employ technique of optically detected cyclotron resonance for evaluation of the role of localization processes in CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures. From microwave-induced changes of excitonic emissions we evaluate magnitude of potential fluctuations (Stokes shift), correlate optically detected cyclotron resonance results with the results of time-resolved experiments and discuss nature of recombination processes in the limit of a strong localization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 559-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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