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    Wyświetlanie 1-5 z 5
    Tytuł:
    Shear Bond Strength Comparison between Conventional Dental Nano Zirconia Combinations and New Functionally Graded Nano Zirconia Combinations after Thermal-Mechanical Cycling
    Autorzy:
    Sun, T.
    Lai, R.
    Liu, R.
    Shao, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1215622.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.85.jc
    Opis:
    The aim of the study was to evaluate the core-veneer bond strength of graded zirconia combinations and compared those to conventional zirconia combinations after thermal and mechanical tests. Conventional zirconia-veneer combinations and graded zirconia-veneer combinations were made into cylinders. Prior to shear bond testing, half of each group was subjected to thermal and mechanical cycling testing at three conditional levels. All specimens were thereafter subjected to a shear force. The fractured surfaces were visually analyzed with scanning electron microscopy. The shear bond strength values of functionally graded zirconia combinations were significantly higher than zirconia combinations, irrespective of the fatigue conditions (P < 0.05). The shear bond strength values of graded zirconia combinations and zirconia combinations before thermal-mechanical cycling were higher than after (P < 0.05). The shear bond strength values of graded zirconia combinations was $40.99 ± 2.22$ MPa, $39.44 ± 2.36$ MPa, $37.45 ± 2.06$ MPa, and $36.87 ± 2.18$ MPa for conditions 0 to 3, respectively. The shear bond strength values were $26.75 ± 2.16$ MPa, $23.95 ± 2.16$ MPa, $21.65 ± 2.14$ MPa, and $20.49 ± 2.16$ MPa for zirconia combinations from conditions 0 to 3, respectively. The functionally graded zirconia combinations exhibited greater shear bond strength than zirconia combinations, irrespective of the fatigue conditions. Thermal-mechanical cycling had an impact on the shear bond strength of both graded zirconia combinations and conventional zirconia combinations.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 238-240
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption kinetics of fluoride on bone char and its regeneration
    Autorzy:
    Hu, J.
    Wu, D.
    Rao, R.
    Liu, R.
    Lai, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/206892.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chlorine compounds
    fluorine compounds
    ions
    sodium compounds
    sulfur compounds
    adsorption kinetics
    chemical reaction equilibrium
    correlation coefficient
    Freundlich equation
    optimal conditions
    layered double hydroxides
    aqueous-solution
    drinking water
    equilibrium
    adsorbent
    związki chloru
    związki fluoru
    jod
    związki sodu
    związki siarki
    kinetyka adsorpcji
    równowaga reakcji chemicznej
    współczynnik korelacji
    równanie Freundlicha
    woda pitna
    równanie Langmuira
    Opis:
    The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F- ions from the BC surface.
    Źródło:
    Environment Protection Engineering; 2017, 43, 3; 93-112
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High pressures studies on hydrides of selected manganese alloys
    Autorzy:
    Sugiura, H.
    Filipek, S.
    Paul-Boncour, V.
    Marchuk, I.
    Liu, R.
    Pyun, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/146225.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    deuterides/hydrides
    high pressure
    ferromagnetic fcc-manganese
    Laves phases
    equation of state
    Opis:
    Specific behavior found in hydrides formed in manganese, Mn-Ni and YMn2 under high pressure is presented and discussed. The synthesis of ferromagnetic fcc-manganese was proved. Parameters of the equations of state (EOS) derived from measurements in the diamond anvil cell (DAC) are summarized for manganese hydrides and for hydrides derived from YMn2 Laves phase. It was found that the compression behavior of recently discovered YMn2H6 is different from YMn2-based hydrides with lower hydrogen content.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 73-77
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Energetic Additive Coated MgH2 on the Power of Emulsion Explosives Sensitized by Glass Microballoons
    Autorzy:
    Cheng, Y.
    Wang, Q.
    Liu, F.
    Ma, H.
    Shen, Z.
    Guo, Z.
    Liu, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/357940.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    emulsion explosive
    power
    hydrogen storage material
    magnesium hydride
    Opis:
    Traditional emulsion explosives, in spite of excellent water resistance, safe handling and good storage performance, have low power problems which seriously hinders their use. In order to improve the power of emulsion explosives, a hydrogen based emulsion explosive was devised. Scanning electron microscope pictures and experimental storage results show that the coating effect and stability of coated magnesium hydride (MgH2) are very good. The power of an emulsion explosive sensitized by glass microballoons was significantly increased (24.30 mm compression of lead block) after adding coated MgH2, compared to only 16.10 mm compression when not added. Thus emulsion explosives with coated MgH2 as an energetic additive have many potential applications.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 3; 705-713
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Crystal Structure, and Properties of a Novel, Highly Sensitive Energetic, Coordination Compound: Iron (II) Carbohydrazide Perchlorate
    Autorzy:
    Liu, R.
    Zhou, Z.
    Qi, S.
    Yang, L.
    Wu, B.
    Huang, H.
    Zhang, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/358343.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    iron (II) carbohydrazide perchlorate
    energetic material
    high
    sensitivity
    DFT
    energy gap
    Opis:
    A single crystal of iron (II) carbohydrazide perchlorate [FeII (CHZ)3](ClO4)2 (FeCP), a novel, lead-free, energetic coordination compound, was synthesized and its structure determined by X-ray single crystal diffraction for the frst time. The crystal belongs to the monoclinic system P2(1)/n space group, with a = 1.0066(2) nm, b = 0.8458(2) nm, c = 2.1194(4) nm, β = 100.693(3)° and Z = 4. The central Fe(II) ion is coordinated to three bidentate carbohydrazide units through the carbonyl oxygen atom and an amino nitrogen atom, forming a six-coordinated, non-centrosymmetric complex cation. The thermal analyses by differential scanning calorimetry and thermogravimetry show that the onset temperature of thermal decomposition (152.7 °C) and the critical temperature of thermal explosion of FeCP (161.2 °C) are both much lower than those of other transition metal carbohydrazide perchlorate compounds, and also those of some other primary explosives in service. FeCP has a high enthalpy of combustion, as measured by oxygen bomb calorimetry. The impact, friction and fame sensitivity tests indicate that FeCP is extremely sensitive and hazardous. Unexpected explosions occurred even during the operational processes. In order to explore the intrinsic cause of these explosions, theoretical calculations of the orbital energies were performed based on DTF. These results reveal that the impact sensitivity is positively correlated with the energy gap between HOMO and LUMO: the smaller energy gap results in the higher impact sensitivity.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 1; 17-36
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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