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  • 1
    Electronic Resource
    Electronic Resource
    By-Products NOx Control and Performance Improvement of a Packed-Bed Nonthermal Plasma Reactor (2000)
    Springer
    Plasma chemistry and plasma processing 20 (2000), S. 225-233 
    Details
    ISSN: 1572-8986
    Keywords: plasma reactor ; methane decomposition ; NOx ; Pd/Pt catalyst ; BaTiO3 ; 13X zeolite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract NOx are main toxic by-products in the effluent gas whendecomposing volatile organic compounds in air by a packed-bed plasmareactor. Several types of materials such as 13X zeolite, BaTiO3and Pd/Pt catalysts have been selected to be packed in the reactor, andmethane decomposition and NOx by-products in discharged gases areinvestigated at different range of reaction temperature and dischargeenergy density at atmospheric pressure. The ratios of methane decompositionpercentage/NOx concentration are used to assess these packed bedmaterials and reaction conditions. The results show that usingPd/γ-Al2O3 with lower percentage Pd as packedbed, and discharging with lower discharge density at higher reactiontemperature can reduce NOx output effectively and greatly improveperformance of the reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007069123634
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    Paper (German National Licenses)
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  • 2
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    M31N 2008-12a-The Remarkable Recurrent Nova in M31-Panchromatic Observations of the 2015 Eruption (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in eruption 10 times, including yearly eruptions from 2008 to 2014. With a measured recurrence period of Prec = 351+/-13 days (we believe the true value to be half of this) and a white dwarf very close to the Chandrasekhar limit, M31N 2008-12a has become the leading pre-explosion supernova type Ia progenitor candidate. Following multi-wavelength follow-up observations of the 2013 and 2014 eruptions, we initiated a campaign to ensure early detection of the predicted 2015 eruption, which triggered ambitious ground- and space-based follow-up programs. In this paper we present the 2015 detection, visible to near-infrared photometry and visible spectroscopy, and ultraviolet and X-ray observations from the Swift observatory. The LCOGT 2 m (Hawaii) discovered the 2015 eruption, estimated to have commenced at August 28.28 +/- 0.12 UT. The 2013-2015 eruptions are remarkably similar at all wavelengths. New early spectroscopic observations reveal short-lived emission from material with velocities approx. 13,000 km/s, possibly collimated outflows. Photometric and spectroscopic observations of the eruption provide strong evidence supporting a red giant donor. An apparently stochastic variability during the early supersoft X-ray phase was comparable in amplitude and duration to past eruptions, but the 2013 and 2015 eruptions show evidence of a brief flux dip during this phase. The multi-eruption Swift/XRT spectra show tentative evidence of high-ionization emission lines above a high-temperature continuum. Following Henze et al. (2015a), the updated recurrence period based on all known eruptions is Prec 174 +/- 10 days, and we expect the next eruption of M31N 2008-12a to occur around 2016 mid-September.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN44015 , The Astrophysical Journal (ISSN 2041-8205) (e-ISSN 2041-8213); 833; 2; 149
    Format: text
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