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    Wyświetlanie 1-3 z 3
    Tytuł:
    Study on particle movement characteristics in sandblast cylinder based on PIV technology
    Autorzy:
    Hui, Zhiquan
    Wu, Feng
    Duan, Haojie
    Yang, Bo
    Lin, Jinmei
    Wang, Lian
    Huang, Si
    Powiązania:
    https://bibliotekanauki.pl/articles/778390.pdf
    Data publikacji:
    2020
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    PIV technology
    Sandblast cylinder
    Particles
    Movement characteristics
    Opis:
    PIV technology was used to investigate the influence of the particles’ relevant parameters on the instantaneous movement characteristics in the sandblast cylinder under the circumstance of different particle sizes, different section heights and different stacking conditions. As the diameter increased, particles had a greater velocity and energy when approaching the wall, which would cause a serious abrasion. The influence of test selection factors on the particles’ radial velocity of particles was greater than that on axial velocity. The radial velocity and axial velocity on the surface of the cylindrical section were all reduced to a lower level when the particles approach the tank wall. When r > 0.3 R, the particle velocity maintained at a higher level, but then decreased slowly when r > 0.7 R. Therefore, the abrasion of the conical section of the sandblast cylinder when r > 0.3 R should be paid more attention to.
    Źródło:
    Polish Journal of Chemical Technology; 2020, 22, 3; 38-47
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Structure and Thermal Behaviour of Imidazolium 2,4,5-Trinitroimidazolate
    Autorzy:
    Jian, Chen
    Pengbao, Lian
    Lizhen, Chen
    Jianlong, Wang
    Jun, Chen
    Powiązania:
    https://bibliotekanauki.pl/articles/357998.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    imidazolium 2,4,5-trinitroimidazolate
    crystal structure
    thermal decomposition
    TG-DSC
    model-free methods
    Opis:
    In this work, imidazolium 2,4,5-trinitroimidazolate was obtained from 2,4,5-tri-iodoimidazole in a yield of 48%. Single-crystal X-ray diffraction analysis showed that this compound belongs to the triclinic crystal system with space group P-1. Thermogravimetric-differential scanning calorimetry (TG-DSC) was performed under a nitrogen atmosphere at heating rates of 5, 10, 15 and 20 °C·min−1. Compound 3 clearly exhibits an exothermic decomposition. The activation energy (E) and pre-exponential factor (lnA) calculated by the Kissinger method were 113.67 kJ·mol−1 and 25.30 s−1, respectively. The E values obtained by the FWO and KAS methods changed slightly from 103.33 to 113.69 kJ·mol−1 and from 101.52 to 111.97 kJ·mol−1, respectively, which makes us believe that its thermal decomposition can be described using only one reaction model. The Šatava-Šesták method and the compensation effect were used to study the thermal decomposition mechanism of imidazolium 2,4,5-trinitroimidazolate. [Formula] is regarded as the most appropriate thermal decomposition kinetic equation. The impact sensitivity, friction sensitivity, detonation velocity and explosion pressure of imidazolium 2,4,5-trinitroimidazolate were 43 cm, 46%, 7056.9 m·s−1 and 1.9703 · 1010 Pa (ρ = 1.538 g·cm−3), respectively. Imidazolium 2,4,5-trinitroimidazolate is incompatible with RDX, HMX, TKX-50 and CL-20.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 4; 547-563
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Property of 1,4-Diamino-3,6- dinitropyrazolo[4,3-c]pyrazole and Its Derivatives
    Autorzy:
    Li, Y.-N.
    Wang, B.-Z.
    Shu, Y.-J.
    Zhang, S.-Y.
    Lian, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358674.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    3,6-dinitropyrazolo[4,3-c]pyrazole (DNPP)
    1,4-diamino-3,6- dinitropyrazolo[4,3-c]pyrazole (DADNP)
    4,4’-(triaz-1-ene-1,3-diyl)bis(1- amine-3,6-dinitropyrazolo[4,3-c]pyrazole) (TBADNP)
    N-amination reaction
    synthesis
    property
    Opis:
    A synthetic procedure has been developed for the synthesis of 1,4-diamino- 3,6-dinitropyrazolo[4,3-c]pyrazole (DADNP) via N-amination reaction. Its derivatives, 4,4’-(triaz-1-ene-1,3-diyl)bis(1-amine-3,6-dinitropyrazolo[4,3-c] pyrazole) (TBADNP) and 1,4-dinitramino-3,6-dinitropyrazolo[4,3-c]pyrazole (DNADNP), were first designed and synthesized by the diazotization and nitrification of amino group, and their structures were characterized by IR, 1H NMR, 13C NMR, elementary analysis and MS. The thermal properties of target compounds were studied by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The thermal decomposition peak temperatures of DADNP, TBADNP and DNADNP are 227, 236 and 288 °C, respectively. Results show that the derivatives of 1,4-diamino-3,6-dinitropyrazolo[4,3-c]pyrazole have better thermal stability.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 2; 321-331
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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