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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 20 of 66 for “"oxidation rate"”.
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A method for measuring the specific oxidation rate of linseed oil
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1931
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Aspects of the oxidation of liquid aluminium alloys.
Nearly all the research on the oxidation of molten aluminium alloys was carried out on quiescent melts. However, in most industrial processes in which molten aluminium is handled, the liquid metal will be under dynamic flowing conditions. Therefore the oxidation behaviour of a melt of aluminium …
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An assessment of oxygen availability, iron build-up and the relative significance of free and attached bacteria, as factors affecting bio-oxidation of refractory gold-bearing sulphides at high solids concentrations
Bacterial oxidation is currently finding significant application for the oxidative pretreatment of refractory gold-bearing sulphides. Plants processing sulphide concentrates have commonly been operated at solids concentrations of between 18 and 20 per cent (m/v) (Le 180 and 200 kg.m-3). At higher …
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Factors affecting use of sorbitol as a carbon source by exponentially growing Gluconobacter oxydans ATCC 19357
Gluconobacters are known for their rapid oxidation of large quantities of sorbitol (SL) and quantitative conversion to sorbose (SE). Whether SL is assimilated into cell material has not been examined before and was investigated in this study. The effect of changing growth and oxidation rates on use …
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Variations in waste load allocations through sensitivity analysis of the QUAL-II water quality model on the South River, Virginia
… the QUAL-II water quality model. The reaeration rate, the ammonia nitrogen oxidation rate, and the carbonaceous deoxygenation coefficient were found to be highly sensitive in the model. Only moderate sensitivity was found with the areal flow contribution, the oxidation rate of nitrite nitrogen, …
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Oxidation and morphology of iron and iron alloy droplets.
The oxidation characteristics of iron droplets and a range of binary iron alloy droplets have been investigated at 1600°C. The droplets were generated by a novel technique of melting the iron or iron-alloy, in the form of wire, in a levitation coil. The droplets were held for several minutes in …
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Chemical and Biological Treatment of Acid Mine Drainage for the Removal of Heavy Metals and Acidity
… metal hydroxide sludge. The system includes the oxidation of ferrous iron in a packed bed bioreactor, the precipitation of iron within a fluidized bed, the removal of manganese and heavy metals (Cu, Ni, Zn) in a trickling filter at high (>9) pH, with final neutralization in a carbonate bed. The …
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An investigation into the effects of preleach time period, nitrogen supplementation and iron concentration on bioleaching performance
… of microbial colonisation, a low ferrous iron oxidation rate and low microbial proliferation rates, ultimately resulting in a poor copper recovery rate.
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Low-Temperature Combustion in a Small-Bore High-Speed Direct Injection Optically Accessible Diesel Engine
… fuel blends showing a lower soot formation rate. The flame luminosity decreased faster for bio-diesel fuel indicating a faster soot oxidation rate. The increased NOx emissions of bio-diesel fuels were greatly reduced by employing the low temperature combustion mode. Results showed that low …
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Selective oxidation of aluminum-bearing III-V semiconductors: Properties and applications to small-volume quantum well heterostructure lasers
"In this work, the water-vapor oxidation of Al-bearing III-V compound semiconductors is used to fabricate small-volume semiconductor light-emitting devices. The oxidized material, native to the crystal, is mechanically and chemically stable. In addition, it is electrically insulating and has a low …
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The microbiology of mining leach liquor regeneration
… Thiobacillus ferrooxidans independently of iron oxidation was developed. This method involved the analysis of protein using the Cobmassie Blue protein-binding assay. It was found to be free from interference by the inorganic ions present in T. ferrooxidans culture medium. The effect of ferrous …
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Decomposition of hydrogen peroxide and organic compounds in the presence of iron and iron oxides
Most advanced oxidation processes use the hydroxyl radical (OH) to treat pollutants found in wastewater and contaminated aquifers because OH reacts with numerous compounds at near diffusion-limited rates. OH can be made by reacting hydrogen peroxide (H202) with either Fe(II) (the Fenton reaction), …
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Modeling Manganese Sorption and Surface Oxidation During Filtration
… to experimental data and used to evaluate the oxidation rate constant, which was the only unknown parameter. An inverse relationship between the fitted reaction rate constant and chlorine concentration was observed, showing that the oxidation reaction does not depend on chlorine concentration …
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The effect of carbon dioxide on the growth and activity of leptospirillum ferriphilum
Microbial oxidation rates catalysed by the acidophilic micro-organisms mediating mesophilic and thermophilic bioleaching of mineral sulphides have been well characterised under conditions typical of active tank leaching processes in the mineral industry. However, with the increasing need to …
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Reaction sintered silicon nitride as a coating for carbon-carbon composites
… carbide coated material exhibits its highest oxidation rate; RSSN afforded less protection to ACC because of a larger thermal expansion mismatch. Organosilicon densification and metallic silicon sealing methods were studied as means of further increasing the oxidation resistance of the …
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Cloud Chemical Heterogeneity and Its Influence on Aqueous sulfur(IV) Oxidation
… drops is expected to influence in-cloud S(IV) oxidation rates. Effects of chemical heterogeneity on overall in-cloud S(IV) oxidation rates will largely depend on contributions of the different oxidation paths. About 84 percent of the samples are calculated to experience little enhancement in …
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Physicochemical Properties and Antioxidant Activity of Enzymatic Modified Soy Protein Isolate Films with Lignin
… layer of a soy oil packaging system, decreased oxidation rate to around 75%, and pentanal production to about 40% of control. UV-blocking ability of AL caused reduction in oxidation rate for more than 75% compared with the normal packaging system. The effectiveness of this active packaging …
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Characterization of Iron-Chromium-Aluminum surface coated Zircaloy-2 under high temperature steam
… and they have been tested with respect to the oxidation weight gain in high temperature steam. In 700C steam environment, the FeCrAl-coated Zry2 samples have significantly reduced the oxidation rate, compared to the uncoated Zry2. Alumina was promoted for FeCrAl with high Al composition, and a …
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Sillica Nanoporous Materials Adsorption and Release Study
… than MCM-41.</p> <p>In this dissertation, the oxidation of epinephrine in the presence of SBA-15 and MCM-41 particles was also carried out. Dense silica particle was test as a control. It was reported that caffeine (1,3,7-trimethylxanthine) can work as a scavenger of the hydroxyl radical at …
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Processing and Optical Uses of Van der Waals Layered Materials
… modeling with experimentation, we calculate the oxidation rate and uncover the mechanisms of spontaneous oxidation of bulk single crystals of ZrSxSe₂₋ₓ alloys and MoS₂. ZrSxSe₂₋ₓ alloys oxidize rapidly, and the oxidation rate increases with Se content. Oxidation of basal surfaces is initiated by …
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