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  • 1
    Electronic Resource
    Electronic Resource
    Spin density distribution in dialkyl oxalate radical anionsESR Studies on Carboxylic Esters, Part 9. For Part 8, see Ref. 1. (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 324-326 
    Details
    ISSN: 0749-1581
    Keywords: Dialkyl oxaltes ; Radical anions ; Isotropic ESR ; Anisotropic ESR ; 2H-, 13C-, 17O-Labelling ; MO calculations ; Spin densities ; E/Z Isomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The isotropic and anisotropic ESR spectra of dialkyl oxalate radical anions, including derivatives which were labelled with 13C or 17O in the carbonyl and 2H or 13C in the alkyl groups, were measured. The spin density distribution as determined from the experimental nuclear hyperfine coupling constants agrees very well with MNDO-CI calculations. As a consequence of the strictly planar structure of the radical anions, E/Z isomers are observed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260410
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    Paper (German National Licenses)
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  • 2
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    Structure and Soot Properties of Nonbuoyant Ethylene/Air Laminar Jet Diffusion Flames (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: The structure and soot properties of round, soot-emitting, nonbuoyant, laminar jet diffusion flames are described, based on long-duration (175-230/s) experiments at microgravity carried out on orbit In the Space Shuttle Columbia. Experiments] conditions included ethylene-fueled flames burning in still air at nominal pressures of 50 and 100 kPa and an ambient temperature of 300 K with luminous Annie lengths of 49-64 mm. Measurements included luminous flame shapes using color video imaging, soot concentration (volume fraction) distributions using deconvoluted laser extinction imaging, soot temperature distributions using deconvoluted multiline emission imaging, gas temperature distributions at fuel-lean (plume) conditions using thermocouple probes, not structure distributions using thermophoretic sampling and analysis by transmission electron microscopy, and flame radiation using a radiometer. The present flames were larger, and emitted soot men readily, than comparable observed during ground-based microgravity experiments due to closer approach to steady conditions resulting from the longer test times and the reduced gravitational disturbances of the space-based experiments.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: Laminar Soot Processes (LSP); 227-242; GDL-GMF-00-03
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Structure and Soot Properties of Nonbuoyant Ethylene/Air Laminar Jet Diffusion Flames (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-10
    Description: The structure and soot properties of round, soot-emitting, nonbuoyant, laminar jet diffusion flames are described, based on long-duration (175-230-s) experiments at microgravity carried out on orbit in the Space Shuttle Columbia. Experimental conditions included ethylene-fueled flames burning in still air at nominal pressures of 50 and 100 kPa and an ambient temperature of 300 K with luminous flame lengths of 49-64 mm Measurements included luminous flame shapes using color video imaging soot concentration (volume fraction) distributions using deconvoluted laser extinction imaging, soot temperature distributions using deconvoluted multiline emission imaging, gas temperature distributions at fuel-lean (plume) conditions using thermocouple probes, soot structure distributions using thermophoretic sampling and analysis by transmission electron microscopy, and flame radiation using a radiometer.The present flames were larger, and emitted soot more readily, than comparable flames observed during ground-based microgravity experiments due to closer approach to steady conditions resulting from the longer test times and the reduced gravitational disturbances of the space-based experiments.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: Soot Formation in Freely-Propagating Laminar Premixed Flames; 207-222; GDL-GMF-01-01
    Format: text
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    NASA TECHNICAL REPORTS
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