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    Wyświetlanie 1-4 z 4
    Tytuł:
    Aspects of red soil properties and water management in China
    Autorzy:
    Cao, Z.
    Zhu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/24946.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    evaporation
    soil structure
    soil water
    physical property
    water management
    China
    soil property
    rainfall
    red soil
    seasonal draught
    Źródło:
    International Agrophysics; 1999, 13, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Telomerase enhances osteogenic ifferentiation of sheep bone marrow mesenchymal stem cells (BMSCs) by up-regulating PI3K/Akt pathway in vitro
    Autorzy:
    Zhu, X.
    Zhou, L.
    Liu, Z.
    Chen, X.
    Wei, L.
    Zhang, Z.
    Liu, Y.
    Zhu, Y.
    Wang, Y.
    Yang, X.
    Han, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087304.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bone marrow mesenchymal stem cells
    telomerase
    proliferation
    osteogenic differentiation
    PI3K/Akt signalling pathway
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 3; 359-372
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A numerical approach to predict the rotating stall in the vaneless diffuser of a centrifugal compressor using the eigenvalue method
    Autorzy:
    Hu, C.
    Liu, P.
    Zhu, X.
    Chen, H.
    Du, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/281006.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    instability
    vaneless diffuser
    eigenvalue problem
    spectral method
    Opis:
    A two-dimensional incompressible flow model is presented to study the occurrence of rotating stall in vaneless diffusers of centrifugal compressors. The diffuser considered has two parallel walls, and the undisturbed flow is assumed to be circumferentially uniform, isentropic, and to have no axial velocity. The linearized 2D Euler equations for an incompressible flow in a fixed frame of the coordinate system are considered. After discretization by a spectral collocation method based on Chebyshev-Gauss-Lobatto points, the generalized eigenvalue problem is solved through the QZ algorithm. The compressor stability is judged by the imaginary part of the eigenvalue obtained. Based on the 2D stability analysis, the influence of inflow angle, radius ratio and wave number are studied. The results from the present stability analysis are compared with some experimental measurement and Shen’s model. It is showed that diffuser instability increases rapidly and the stall rotational speed decreases quickly with an increase in the diffuser radius ratio. The largest critical inflow angle can be obtained when the wave number is around 3 ∼ 5 for the radius ratio between 1.5 to 2.2. It is also verified that the stability model proposed in this paper agrees well with experimental data and has the capability to predict the onset of rotating stall, especially for wide diffusers.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 635-647
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deashing and desulphurization of fine oxidized coal by falcon concentrator and flotation
    Autorzy:
    Zhu, X.
    Tao, Y.
    Sun, Q.
    Man, Z.
    Xian, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/951856.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fine oxidized coal
    desulphurization
    deashing
    flotation
    enhanced gravity separation
    Opis:
    Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 634-646
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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