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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spin-Dependent Tunneling in a Magnetic Field for Junctions Involving Normal and Superconducting CDW Metals
    Autorzy:
    Ekino, T.
    Gabovich, A. M.
    Suan Li, Mai
    Pękała, M.
    Szymczak, H.
    Voitenko, A. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046730.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.45.Lr
    74.50.+r
    85.75.-d
    Opis:
    The voltage, V, dependences of the differential tunnel conductance G(V) were calculated for two kinds of junctions involving normal and superconducting charge-density-wave metals (CDWMs) in the external magnetic field H. The first is a non-symmetrical junction with a CDWM electrode being biased with respect to a ferromagnet. Calculations show that the paramagnetic splitting occurs between spin-up and spin-down components of G(V), similar to what is observed when a superconducting electrode is used instead of the CDWM one. The second setup is symmetric (CDWM-I-CDWM), where I denotes an insulator. If at least one of the CDWM electrodes is normal and H≠0, G(V) will also be spin-split.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 477-484
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudogap-Like Phenomena in Cuprates as a Manifestation of Charge-Density Waves
    Autorzy:
    Ekino, T.
    Gabovich, A.
    Voitenko, A.
    Suan Li, Mai
    Szymczak, H.
    Pękała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812272.pdf
    Data publikacji:
    2008-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Jn
    71.45.Lr
    74.50.+r
    74.81.-g
    Opis:
    Differential conductance G as a function of the bias voltage V was measured for break-junctions of superconducting $Bi_2Sr_2CaCu_2O_{8+δ}$ and $YBa_2Cu_3O_{7-δ}$. The dependences G(V) for both materials clearly demonstrate the so-called dip-hump structures outside the gap region. A theory, which suggests the charge-density-wave origin of the dip-hump structures and explains its specific form by intrinsic inhomogeneity of cuprate materials, was developed. The well-known pseudogap features in the tunnel spectra of high-$T_c$ oxides found both below and above the superconducting critical temperature are also described by the theory, which testifies that both the pseudogap and the dip-hump structures have the same origin. Competing theories and various G(V) peculiarities found for a number of superconducting oxides are briefly discussed.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 1; 59-66
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the co-processing technology of crude oil and coal and its deployment
    Autorzy:
    Li, Suan
    Liu, Qi
    Deng, Qingyu
    Ye, Hang
    Zhou, Xuejie
    Qiao, Aijun
    Powiązania:
    https://bibliotekanauki.pl/articles/2174828.pdf
    Data publikacji:
    2022
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    crude oil
    coal
    the co-processing technology
    process development
    industrial application
    Opis:
    The effect of process conditions on the co-processing technology of crude oil and coal was investigated. Crude oil/coal matching performance, swelling degree, crude oil/coal slurry viscosity-temperature characteristics and process parameters were obtained via the laboratory scale and pilot scale studies. The optimum reaction temperature of the co-processing was 445~450 °C, the pressure was 19 MPa, the catalyst addition was 3 wt.%, the reaction time was 2 h, and the ratio of hydrogen to crude oil was 1500 (V/V). Furthermore, the co-processing technology including catalyst and corresponding equipment based on the slurry bed hydrogenation were developed. By using this co-processing technology, the feed ratio of crude oil and coal can be 1:1, the coal conversion rate can be over 99%, the light oil (oil and aromatics) yield was over 70%, and the end products were gasoline, diesel, jet fuel, aromatics and LPG. The product quality meets the Euro V standard, whilst aromatics accounted for 48% of the light oil. So it was proved to be feasible to co-refine crude oil and coal at a ratio of 1:1. What’s more, the slurry bed hydrogenation plant and its equipment were tested for long-term operation, and it has been proved that this co-processing technology could be deployed as large-scale industrial application.
    Źródło:
    Polish Journal of Chemical Technology; 2022, 24, 4; 39--50
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self-catalysed hydrogenation of heavy oil and coal mixtures
    Autorzy:
    Li, Suan
    Sun, Zhenguang
    Liu, Qi
    Ye, Hang
    Wang, Kunpeng
    Powiązania:
    https://bibliotekanauki.pl/articles/27315628.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    self-catalysed
    heavy oil
    hydrogenation
    coal liquefaction
    co-processing technology
    Opis:
    Coal liquefaction and heavy oil processing have become the urgent need for national energy strategic technology reserves in China. However, the inactivation of solid catalysts in these processes is an inevitable problem. Therefore,a self-catalysed method was proposed. The properties of raw oil could be changed by adding a modifier, as it has the function of self-catalysis, and the additional catalyst is no longer needed. The effect of 200 ppm modifier onthe hydrogenation of heavy oil and 500 ppm on the hydrogenation of coal and oil were investigated. The results showed that modifiers could be miscible with heavy oil at 50~100 °C and could change the properties of oil. When the temperature exceeded 250 °C, the sulfur element in the heavy oil combined with the metal element broughtin by the modifier to form a particle with the size of 2–8 nm, which could interact with the hydrogen molecule toactivate the hydrogen molecule. Activated hydrogen atoms further formed the complexes with nickel, vanadium,calcium, iron, and other elements in heavy oil to achieve the purpose of purifying and lightening the oil phase.Therefore, the self-catalysed method could be widely used in oil re fining and would greatly promote the development of the oil refining and catalysis industry.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 2; 8--14
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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