7 research outputs found

    An examination of skill deterioration and retraining in the United States Navy

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    http://archive.org/details/examinationofski00taylLieutenant, United States NavyApproved for public release; distribution is unlimited

    The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

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    Res Gestae 1993 Volume 15 No. 1

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    Cover story: Alumni in the news, 2; Program briefs, 8; Student notes, 12; Features, 16; Development update, 20; Faculty activities, 22; Alumni, 29; Scenes from the season, 33

    Measurements of the Absorption Cross Section of <sup>13</sup>CHO<sup>13</sup>CHO at Visible Wavelengths and Application to DOAS Retrievals

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    The trace gas glyoxal (CHOCHO) forms from the atmospheric oxidation of hydrocarbons and is a precursor to secondary organic aerosol. We have measured the absorption cross section of disubstituted <sup>13</sup>CHO<sup>13</sup>CHO (<sup>13</sup>C glyoxal) at moderately high (1 cm<sup>–1</sup>) optical resolution between 21 280 and 23 260 cm<sup>–1</sup> (430–470 nm). The isotopic shifts in the position of absorption features were found to be largest near 455 nm (Δν = 14 cm<sup>–1</sup>; Δλ = 0.29 nm), whereas no significant shifts were observed near 440 nm (Δν < 0.5 cm<sup>–1</sup>; Δλ < 0.01 nm). These shifts are used to investigate the selective detection of <sup>12</sup>C glyoxal (natural isotope abundance) and <sup>13</sup>C glyoxal by <i>in situ</i> cavity enhanced differential optical absorption spectroscopy (CE-DOAS) in a series of sensitivity tests using synthetic spectra, and laboratory measurements of mixtures containing <sup>12</sup>C and <sup>13</sup>C glyoxal, nitrogen dioxide, and other interfering absorbers. We find the changes in apparent spectral band shapes remain significant at the moderately high optical resolution typical of CE-DOAS (0.55 nm fwhm). CE-DOAS allows for the selective online detection of both isotopes with detection limits of ∼200 pptv (1 pptv = 10<sup>–12</sup> volume mixing ratio), and sensitivity toward total glyoxal of few pptv. The <sup>13</sup>C absorption cross section is available for download from the Supporting Information

    Meaningful Tort Reform: A Public Choice Analysis

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    Lipid metabolism in astrocytic structure and function

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    The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

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    SSCI-VIDE+ATARI:CARE+BNO:BDAInternational audienc
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