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    Wyświetlanie 1-3 z 3
    Tytuł:
    Simulation of Dendrite Morphology and Micro-Segregation in U-Nb Alloy During Solidification
    Autorzy:
    Su, Bin
    Liu, Jing-Yuan
    Zhang, Xiao-Peng
    Yan, Xue-Wei
    Powiązania:
    https://bibliotekanauki.pl/articles/2174585.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-Nb alloys
    solidification process
    dendrite growth
    cellular automaton
    numerical simulation
    Opis:
    Due to the importance of uranium and uranium alloys to national defence and nuclear industrial applications, it is necessary to understand dendrite formation in their solidification structures and to control their microstructures. In this study, a modified cellular automaton model was developed to predict 2-D and 3-D equiaxed dendrite growth in U-Nb alloys. The model takes into account solute diffusion, preferential growth orientation, interface curvature, etc., and the solid fraction increment is calculated using the local level rule method. Using this model, 2-D large-scale and 3-D equiaxed dendrite growth with various crystallographic orientations in the U-5.5Nb alloy were simulated, and the Nb micro-segregation behaviour during solidification was analysed. The simulated results showed reasonable agreement with the as-cast microstructure observed experimentally.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1333--1339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation studies on the influence of other combustible gases on the characteristics of methane explosions at constant volume and high temperature
    Autorzy:
    Luo, Zhenmin
    Liu, Litao
    Gao, Shuaishuai
    Wang, Tao
    Su, Bin
    Wang, Lei
    Yang, Yong
    Li, Xiufang
    Powiązania:
    https://bibliotekanauki.pl/articles/1853863.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gaz palny
    ciśnienie wybuchu
    temperatura płomienia
    constant volume
    volume fraction of combustible gas
    initial temperature
    adiabatic flame temperature
    maximum explosion pressure
    Opis:
    Gas explosions are major disasters in coal mining, and they typically cause a large number of deaths, injuries and property losses. An appropriate understanding of the effects of combustible gases on the characteristics of methane explosions is essential to prevent and control methane explosions. FLACS software was used to simulate an explosion of a mixture of CH4 and combustible gases (C2H4, C2H6, H2, and CO) at various mixing concentrations and different temperatures (25, 60, 100, 140 and 180℃). After adding combustible gases to methane at a constant volume and atmospheric pressure, the adiabatic flame temperature linearly increases as the initial temperature increases. Under stoichiometric conditions (9.5% CH4-air mixture), the addition of C2H4 and C2H6 has a greater effect on the adiabatic flame temperature of methane than H2 and CO at different initial temperatures. Under the fuel-lean CH4-air mixture (7% CH4-air mixture) and fuel-rich mixture (11% CH4-air mixture), the addition of H2 and CO has a greater effect on the adiabatic flame temperature of methane. In contrast, the addition of combustible gases negatively affected the maximum explosion pressure of the CH4-air mixture, exhibiting a linearly decreasing trend with increasing initial temperature. As the volume fraction of the mixed gas increases, the adiabatic flame temperature and maximum explosion pressure of the stoichiometric conditions increase. In contrast, under the fuel-rich mixture, the combustible gas slightly lowered the adiabatic flame temperature and the maximum explosion pressure. When the initial temperature was 140℃, the fuel consumption time was approximately 8-10 ms earlier than that at the initial temperature of 25℃. When the volume fraction of the combustible gas was 2.0%, the consumption time of fuel reduced by approximately 10 ms compared with that observed when the volume fraction of flammable gas was 0.4%.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 2; 279-295
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The lagged effect of air pollution on human eosinophils: a distributed lag non-linear model
    Autorzy:
    Ding, Zhaojun
    Xie, Zhen
    Su, Yang
    Qi, Jiying
    Cui, Bin
    Powiązania:
    https://bibliotekanauki.pl/articles/2116610.pdf
    Data publikacji:
    2020-04-30
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    air pollution
    gender difference
    eosinophils
    real-world data
    lagged effect
    distributed lag non-linear model
    Opis:
    ObjectivesThe aim of this study was to determine the lag between exposure to air pollutants and changes in human eosinophil counts.Material and MethodsThis was a retrospective study employing 246 425 physical examination records dated December 2013 – December 2016 from Chengdu, China. The authors determined the prevalence of individuals with eosinophil counts above the normal reference range each day. A distributed lag non-linear model was used to evaluate the lagged effect of each air pollutant on eosinophil counts. The lagged effects of each air pollutant were counted and presented with smoothing splines.ResultsThe effects of air pollutants such as particulate matter (PM2.5, aerodynamic diameters <2.5 μm; PM10, aerodynamic diameters <10 μm), nitrogen dioxide (NO2) and ozone (O3) were evaluated. In women, the effects of PM2.5 (RR = 1.154, 95% CI: 1.061–1.255) and PM10 (RR = 1.309, 95% CI: 1.130–1.517) reached the maximum values on lag day 0. In men, there was no significant effect of PM2.5, but significant effects of PM10 were found for lag days 20–28. The effects of NO2 and O3 on eosinophils were not statistically significant for either gender.ConclusionsThe air pollutants of PM10 have a significant effect on human eosinophils for both women and men, but with different temporal patterns, with women showing a lag of 0–5 days and men showing a lag of 20–28 days. In addition, PM2.5 was significant for women with a lag of 0–3 days but it was not significant for men.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2020, 33, 3; 299-310
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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