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Showing 1 to 20 of 34 for “"Transformation Products"”.
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Investigation into the transformation products of CD3MN cast duplex stainless steel
<p>The transformation products for CD3MN cast duplex stainless steel (DSS) were investigated between the temperatures of 600 to 9500C. The primary research evaluated the kinetics of sigma ([Sigma]) phase formation by developing the time-temperature-transformation diagram for CD3MN and comparing …
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Application of microstructural texture parameters to diffusional and displacive transformation products
… Unfortunately, the diffusional and displacive transformation products, martensite and bainite, exhibit very fine microstructures with a low contrast, so that conventional microstructural image analysis cannot be applied readily to distinguish these structures. As an alternative microstructural …
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Formation and removal of pesticides and pesticide transformation products during water treatment
… conditions and dosages. The most common oxidants/transformation agents in water treatment systems were examined for reactivity including free and combined chlorine, chlorine dioxide, permanganate, ozone, hydrogen peroxide, ultraviolet radiation, and high pH (alkaline hydrolysis). Due to the broad …
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The effects of electron beam irradiation on additives present in food-contact polymers.
… presence of many irradiation derived antioxidant transformation products in extracts from irradiated polymers. Attempts have been made to isolate and identify these compounds, and a number of possible structures are proposed following lc-ms studies. In some cases, the irradiation-derived …
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The antioxidant role of vitamin E in polyolefins
… However, hindered phenols undergo chemical transformations while performing their antioxidant function during processing and fabrication. In addition, antioxidants are subject to loss from polymers during processing, or subsequently in-service. Migration of antioxidants is a major concern in …
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Modelling of Simultaneous Transformations in Steels
… of a steel is often developed by solid-state transformation from austenite. The major transformation products are allotriomorphic ferrite, pearlite, Widmanstatten ferrite, bainite and martensite, differentiated by morphological features, and their nucleation and growth mechanisms. A steel …
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BIOTRANSFORMATION AND MUTAGENICITY OF BENZIDINE
… and to determine what effect such biotransformation would have on the mutagenicity of the compound. Bacteria were collected from sites of toxic waste dumping and from estuarine, lake, and ocean locations. Sediment and water samples as well as bacterial isolates were incubated in media …
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Transformations of carotenoids in the oceanic water column
… collected in these same areas was dominated by transformation products. Fucoxanthin, the primary carotenoid of marine diatoms, typically constituted 77-100% of the total fucopigments in suspended particulate material. In sediment trap samples this pigment constituted only 4-85% of the total. The …
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Magnetite Oxidation in Aqueous Systems
… been done to describe the kinetics of magnetite transformation during oxidation. This work focuses on monitoring the concentrations of magnetite and one of its oxidation transformation products, maghemite, by the use of UV-Vis-NIR spectroscopy. As oxidation proceeded at a constant specific …
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A Study of Phosphorus-Containing Antioxidants in Polyolefins
… of NiDiBuPn and TBH showed that the major transformation products are the corresponding sulphides, the acidic species, the phosphorus esters and some highly oxygenated inorganic species.
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Interaction of fluroquinolone antibiotics with nanophase metal oxide photocatalysts and soil minerals
… they will be retained in a given system, the transformations they may undergo, and resultant potency of transformation products. Both transport and chemical transformation processes can be strongly influenced by the adsorption properties of the pharmaceuticals. This study focuses on a select …
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The Beckmann and Schmidt rearrangements as an approach to the synthesis of diazabiphenylenes
… 2,7] undecane-4,9-dione, and a number of its transformation products are described. The Beckmann rearrangement of the mixture of dioximes derived from the diketone, also gave a mixture of two dilactams; the major component was established as cis, trans, cis-4,10-diazatricyclo [6,4,0,0 2,7] …
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Ammonia-monooxygenase-mediated cometabolic biotransformation and abiotic transformation of micropollutants
Biotransformation of a number of micropollutants (MPs) has been found to positively correlate with nitrification activities in inhibition studies of nitrifying activated sludge communities. To further elucidate roles played by ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) …
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Electron Transfer Processes between Hydrogen Sulfide and Humic Substances - Implications for Anaerobic Sulfur Cycling in Freshwater Ecosystems
… In the first study, we investigated the abiotic transformation of sulfide upon reaction with reduced and non-reduced Sigma Aldrich humic acid (HA), under anoxic conditions. Sulfide reacted with non-reduced HA at rates comparable to sulfide oxidation by iron oxides or molecular oxygen. The main …
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Metal Complex Photo-activators for the Time-Controlled, Photo-Oxidation of Polyolefins
… sulphinate were found to be amongst the first transformation products formed from the above reactions. There is also evidence of the formation of disulphide from nickel and iron complexes, but not from the zinc dithiocarbamate during reaction with hydroperoxide. Details of the mechanism of …
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Establishing a physical and chemical framework for Amorphous Calcium Carbonate (ACC) biomineralization
… that is frequently found in final crystalline products in calcified skeletons. This three-part dissertation investigated biological and well-characterized synthetic ACC using high-energy x-ray methods, Raman spectroscopy, and mechanical tests. The findings establish chemical and physical …
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Development of Nontargeted Screening Algorithms for Indoor Contaminants
… of these chlorinated compounds, various consumer products were collected from Toronto homes and screened for toxic halogenated contaminants with an emphasis on chlorinated paraffins. Chlorinated paraffin compounds were detected in 84 of 96 products analyzed, including electronic devices and …
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