Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"dimethyl sulfide"”.
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Development, uncertainty quantification, and reduction of a dimethyl sulfide oxidation mechanism
Dimethyl sulfide (DMS), arising from phytoplankton, is the largest natural source of sulfur in the atmosphere. The oxidation products of DMS, such as methanesulfonic acid and sulfuric acid, can contribute to cloud condensation nuclei. Studying the oxidation mechanism of DMS will help improve our …
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The adsorption of sulfur and halogen containing materials on nickel studied by X-ray photoelectron spectroscopy and thermal desorption spectroscopy
… chloride, methyl bromide, methyl iodide, methyl sulfide, dimethyl sulfide, dimethyl disulfide, and bis(trifluoromethyl) disulfide on clean, polycrystalline nickel surface (at 25°C) were investigated using an X-ray photoelectron spectrometer (XPS) and a thermal desorption system with mass …
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A study of kernel composition affecting the quality ofshrunken2 sweet corn
… the primary focus was on the levels of dimethyl sulfide (DMS), the compound responsible for the characteristic ""corny"" aroma, and sugars (i.e. fructose, glucose, sucrose and total sugar), which are the principal kernel flavor constituents in sweet corn. Other kernel chemical components …
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Measuring and Developing a Control Strategy for Odorous Gases from Solids Handling Processes of a Large Wastewater Treatment Plant
… several predetermined odorants. A carboxen-polydimethylsiloxane fiber was used for the analysis of an amine, and several sulfur compounds, and a polyacrylate fiber for the analysis of predetermined volatile fatty acids. Calibration curves were developed within the ranges 0.0004 and 2.9943 ppmv …
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Identification and characterization of potent odorants in selected beet root (Beta vulgaris) products
… undetected, including methanethiol and dimethyl sulfide, which was a particularly potent odorant. This technique enabled the discovery of previously undetected compounds, which may be important for subsequent creation of a beet odor model system. However, knowledge of the specific …
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Developing novel tools to explore the marine volatilome
Key volatile organic compounds (VOCs) such as dimethyl sulfide (DMS) and isoprene have been extensively studied for their importance as semiochemicals and in climate regulation. In contrast, disentangling the myriad of signature VOCs in gas chromatographicdata has received much less attention. This …
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Bioavailable Iron in Equatorial Pacific Ocean Aerosol Samples
… both sunlight and electron donors (EDs) such as dimethyl sulfide and organic acids. Detection limits were as low as 40 pM Fe(II) and 100 pM H<sub>2</sub>O<sub>2</sub>. Fe(II)in aerosol concentration was found to be 0.29 ± 1.48 pg m<sup>-3</sup> in large, 19.14 ± 18.31 pg m<sup>-3</sup> in coarse, …
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Laboratory studies of atmospheric photochemistry in indoor and outdoor environments
… First, this thesis examines the oxidation of dimethyl sulfide (DMS), which represents a large natural source of sulfur to the atmosphere and affects the climate. Using varied chemical conditions across numerous environmental chamber experiments, we characterize aerosol formation from the …
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Sensorial characteristics of odour active compounds from raw natural rubber
… within rubber emissions were methyl mercaptan, dimethyl sulfide, dimethyl disulfide, and dimethyl trisulfide. Due to their low Odour Threshold Value (OTV), all identified VSCs potentially contribute to the overall sensorial profile of the rubber odour. While Volatile Organic Compounds (VOCs) …
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ANION EFFECTS IN HOMOGENOUS PALLADIUM CATALYSIS AND LUMINESCENT PROPERTIES OF COPPER(I) COMPLEXES BEARING A WEAKLY-COORDINATING ANIONIC N-HETEROCYCLIC CARBENE LIGAND
… of the NHC backbone. Facile dissociation of a dimethyl sulfide ligand with metal alkoxide/phenoxides/thiophenoxides affords sodium or potassium salts. With these anions in hand, ion pairs are isolated in polar solvents and in the solid state. Au anions reside in the outer sphere of the …
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Identifying preferences for specific beef flavor characteristics
… Samples with higher concentrations of dimethyl sulfide were rated lower (P < 0.05) for overall flavor desirability. The concentrations of several volatile compounds were correlated with various beef flavors including beefy/brothy, buttery/beef fat, browned/grilled, earthy/mushroom, …
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Detectability of biosignature gases in the atmospheres of terrestrial exoplanets
… oxide, methyl bromide, methyl chloride, hydrogen sulfide, carbonyl sulfide, phosphine, and sulfur dioxide. The deep investigation of the HITRAN biosignature gases in this study is possible due to the ability to properly map their absorption cross sections to varying temperatures and pressures. For …