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  • methane activation  (2)
  • syntergism  (2)
  • Atomic and molecular processes in external fields, including interactions with strong fields and short pulses  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Methane activation over unsupported and La2O3-supported copper and nickel catalysts (1996)
    Springer
    Catalysis letters 36 (1996), S. 159-163 
    Details
    ISSN: 1572-879X
    Keywords: methane activation ; Cu/La2O3 and Ni/La2O3 catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Methane was pulsed over pure CuO and NiO as well as Cu/La2O3 and Ni/La2O3 catalysts at 600° C. Results indicate that the mechanisms for methane activation over copper and nickel are quite different. Over CuO, methane is converted to CO2 and H2O, most likely via the combustion mechanism; whereas metallic copper does not activate methane. Over NiO in the presence of metallic nickel sites, methane activation follows the pyrolysis mechanism to give CO, CO2, H2 and H2O. Similar results were obtained over the Cu/La2O3 and Ni/La2O3 catalysts. XRD investigations indicate that copper and nickel existed as CuLa2O4 and LaNiO3 respectively in the La2O3-supported catalysts. The effect of La2O3 on the activation of methane is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807613
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pulse studies of CH4 interaction with NiO/Al2O3 catalysts (1994)
    Springer
    Catalysis letters 27 (1994), S. 199-206 
    Details
    ISSN: 1572-879X
    Keywords: pulse reaction ; NiO/Al2O3 catalysts ; methane activation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Pulse studies of the interaction of CH4 and NiO/Al2O3 catalysts at 500°C indicate that CH4 adsorption on reduced nickel sites is a key step for CH4 oxidative conversion. On an oxygen-rich surface, CH4 conversion is low and the selectivity of CO2 is higher than that of CO. With the consumption of surface oxygen, CO selectivity increases while the CO2 selectivity falls. The conversion of CH4 is small at 500°C when a pulse of CH4/O2 (CH4∶O2=2∶1) is introduced to the partially reduced catalyst, indicating that CH4 and O2 adsorption are competitive steps and the adsorption of O2 is more favorable than CH4 adsorption
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806993
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of selenium on sulfur uptake by barley and rice (1990)
    Springer
    Plant and soil 121 (1990), S. 151-153 
    Details
    ISSN: 1573-5036
    Keywords: Hordeum vulgare L. ; Oryza sativa L. ; selenate ; solution culture ; sulfate ; syntergism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Because of their chemical and physical similarities, plant uptake of S and Se are closely related. Barley (Hordeum vulgare L.) and rice (Oryza sativa L.) were grown in greenhouse solution culture to examine the synergistic interactions between SO4 and Se6+ in plant uptake. In the presence of low concentrations of solution SO4, shoot and root yields were decreased with additions of Se6+. However, when SO4 was present in elevated concentrations, no Se-induced yield reduction occurred. A synergistic interaction between SO4 and Se6+ caused an increase in the shoot S concentrations with increasing concentrations of Se6+ at low SO4 solution concentrations. At elevated SO4 concentrations, no synergism was osberved. Selenium had a lesser effect on the S concentration in plant roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013109
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  • 4
    Electronic Resource
    Electronic Resource
    The effect of selenium on sulfur uptake by barley and rice (1990)
    Springer
    Plant and soil 122 (1990), S. 151-153 
    Details
    ISSN: 1573-5036
    Keywords: Hordeum vulgare L. ; Oryza sativa L. ; selenate ; solution culture ; sulfate ; syntergism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Because of their chemical and physical similarities, plant uptake of S and Se are closely related. Barley (Hordeum vulgare L.) and rice (Oryza sativa L.) were grown in greenhouse solution culture to examine the synergistic interactions between SO4 and Se6+ in plant uptake. In the presence of low concentrations of solution SO4, shoot and root yields were decreased with additions of Se6+. However, when SO4 was present in elevated concentrations, no Se-induced yield reduction occurred. A synergistic interaction between SO4 and Se6+ caused an increase in the shoot S concentrations with increasing concentrations of Se6+ at low SO4 solution concentrations. At elevated SO4 concentrations, no synergism was osberved. Selenium had a lesser effect on the S concentration in plant roots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02444116
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  • 5
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    Pulsed phonon lasing in trapped ions (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-05-07
    Description: Author(s): Y. Xie, W. Wan, H. Y. Wu, F. Zhou, L. Chen, and M. Feng Optical laser pulses play important roles in various fields, and the phononlike analog, i.e., phonon laser pulses, should also be very useful. We show the possibility of pulsed phonon lasing in trapped ions based on our observation that coherent phonon pulses are generated and then transferred betwe... [Phys. Rev. A 87, 053402] Published Mon May 06, 2013
    Keywords: Atomic and molecular processes in external fields, including interactions with strong fields and short pulses
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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