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Wyszukujesz frazę "Srivastava, J." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Inverse Hall-Petch Like Mechanical Behaviour in Nanophase Al-Cu-Fe Quasicrystals: A New Phenomenon
    Autorzy:
    Mukhopadhyay, N.
    Ali, F.
    Scudino, S.
    Samadi Khoshkhoo, M.
    Stoica, M.
    Srivastava, V.
    Uhlenwinkel, V.
    Vaughan, G.
    Suryanarayana, C.
    Eckert, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373423.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.44.Br
    Opis:
    The structural and mechanical stability of quasicrystals are important issues due to their potential for possible applications at high temperatures and stresses. The aim of the present work is, therefore, to review the earlier works on conventional crystalline and quasicrystalline materials and also to report the results and the analysis on the Hall-Petch and inverse Hall-Petch like behavior of nanoquasicrystalline $Al_{62.5}Cu_{25}Fe_{12.5}$ alloys. It was observed that, at large grain sizes, the hardness increases with decreasing grain size, exhibiting the conventional Hall-Petch relationship, whereas for smaller grains, inverse Hall-Petch behavior was identified. The inverse Hall-Petch behavior in the nanoquasicrystalline phase could be attributed to thermally activated shearing of the grain boundaries, leading to grain boundary sliding in nanostructures of quasicrystalline grains. These results were analyzed based on the dislocation pile-up model as well as the grain boundary shearing models applicable to nanomaterials.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 2; 543-548
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of regeneration and filtration mechanism in diesel particulate filter for development of composite regeneration emission control system
    Autorzy:
    Kurien, C.
    Srivastava, A. K.
    Naudin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/140328.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    catalysis
    filtration
    regeneration
    soot
    katalizator
    filtracja
    regeneracja
    sadza
    Opis:
    Pre-treatment techniques employed for exhaust emission control of compression ignition engines were found to reduce the emission levels by small percentage only, failing to meet the required emission regulations. Post-treatment technique including diesel particulate filtration, diesel oxidation catalysis and selective catalytic reduction is found to be an effective solution. While the fuel-based regeneration of diesel particulate filter leads to uncontrolled combustion affecting the durability of the filter. Development of an effective regeneration system is one of the major technical challenges faced by automotive industry for meeting emission norms. A composite regeneration system with the application of microwave energy is proposed in this paper. As an initial phase, a three-dimensional model of the system is developed and its flow analysisis carried out by considering the case of single channel flow. Simulation of the regeneration process is also done by developing a Simulink model. The results of simulation showed that an engine running continuously for a period of 24 hours would require three regenerations.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 2; 277-290
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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