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 20 of 31 for “"Mechanism and kinetics"”.
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Mechanism and kinetics of homogeneous catalysis
… consumption, evolution of molecular weight, and end-group analysis was employed to determine each of the reaction specific rate constants involved in 1-hexene polymerization process catalyzed by a family of group IV single-site catalysts. The primary set of elementary reaction steps included …
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Mechanism and kinetics of transformation of alumina inclusions in steel by calcium treatment
… the benefit of modifying inclusion composition, and the shape and size of these inclusions are also adjusted. Two of the main advantages of calcium treatment are not only the improvement of the castability but also the improvement of the final properties of the steels' machinability, toughness …
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The thermodynamics, mechanism and kinetics of the catalytic conversion of propylene and water to diisopropyl ether over amberlyst 15
… in a single step from a feed of propylene and water over Amberlyst 15 ion exchange resin catalyst. It was produced in a trickle bed reactor at pressures between 1 bar and 60 bar, at temperatures between 70°C and 160°C and at overall propylene to water ratios between 1:5 and 10:1. Reaction …
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Studies on the mechanism and kinetics of bioleaching with special reference to the bioleaching of refractory gold-bearing arsenopyrite
… for the leaching of whole-ore copper heaps and the pre-treatment of refractory arsenical gold ores and concentrates. For the case of refractory arsenical gold concentrates, it offers an economically feasible alternative to pressure oxidation and has environmental advantages over roasting …
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Orientation and Phase Behavior of Block Copolymers in External Electric Fields
… The results range from an analysis of the mechanism and kinetics of the reorientation process, via the discussion of the driving force, to first investigations on the influence of an electric field on the phase behavior. The electric field induced effects on concentrated block copolymer …
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Exploration of the mechanism of rhodium(III) co-precipitation with copper sulfide (at low rhodium concentrations) incorporating the cationic substitution reaction path
… study is a preliminary investigation into the mechanism and kinetics of Rh3+ coprecipitation with CuS upon aqueous thiosulphate addition to acidic base metal sulphate solutions, where Rh3+ concentration is two orders of magnitude lower than Cu2+, over 50 - 150 °C. The heterogeneous cationic …
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Spectroscopic and Kinetic Studies of Hydrodenitrogenation and Hydrodesulfurization over Supported Nickel Phosphide (Ni₂P)
This dissertation describes preparation and characterization of Ni₂P catalysts and their application in hydrodesulfurization (HDS) and hydrodenitrogenation (HDN). The work carried out includes synthesis of Ni₂P on different siliceous supports, SiO2 and MCM-41. It also includes characterization of …
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Chemical kinetic investigation of a commercial batch reactor process
… resin, in order to optimise the efficiency and economics of the batch processes. The batch process models are largely empirical in nature as the reaction mechanism is unknown. The process chemistry and the commercial manufacturing method are described. A small scale system was established in …
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Preparation and characterisation of inorganic nanostructured support materials for polymer electrolyte fuel cells
… (PEFCs) have been identified as a safe, clean and reliable alternative energy conversion technology to conventional, fossil fuel based, ones. However, the hindrance to worldwide commercialisation of this technology lies in the poor durability and high costs associated with the current carbon …
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Studying the kinetics and mechanism of the formation and degradation of electrocatalysts using in situ characterization techniques
… heavily on fossil fuels including coal, oil, and natural gas for its energy. As a non-renewable resource, fossil fuels are the main sources for the production of carbon dioxide and will become more expensive as the supplies diminish. As the demand in energy rises (by 70% by 2040 per an …
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Study of Faradaic Reactions Occurring At Polycrystalline Platinum Electrode Surfaces in Frozen, Aqueous Acidic Electrolyte
As the global demand for fuel cells in transportation vehicles continues to increase, it is important to understand how fuel cells operate under various environmental conditions. Currently little is known about interfacial properties and electrode behavior in frozen electrolytes. Such knowledge may …
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Investigation into reliability and performance of an implantable closed-loop insulin delivery device
… mimic pancreas. In this thesis, the reliability and performance capability of the INsmart device was studied for future clinical use. Investigations into the device material compatibility with insulin solution, assessed by monitoring insulin loss and degradant formation over a period of 31 days …
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Microencapsulated phase change materials for thermal energy storage: development, evaluation, and application
… lately for potential use in heat transfer and thermal energy storage (TES) applications due to their high energy storage density. The major obstacle limiting more widespread application of PCMs is containment of the liquid phase to prevent leakage and migration. To eliminate this problem …
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The inclusion behaviour of "wheel-and-axle" host compounds
The inclusion behaviour of three "wheel-and-axle" host molecules was investigated. By virtue of their shape and the way in which they pack these host molecules are able to entrap guest molecules into a host-guest array. The host compounds were: 1,1,6,6-tetraphenyl-hexa-2,4-diyne-1,6-diol (HOST1), …
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Aging Study of Silver-exchanged Mordenite and Silver-functionalized Silica Aerogel in Dry Air, Humid Air, No and No2
… from the spent nuclear fuel reprocessing system, and it is essential to remove 129I vapor because 129I has a long half-life (1.6 x 107 years) and can be fatal to the human body if released to the environment. Radioactive iodine vapor can be effectively captured by silver containing adsorbents such …
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Self-assembly and aggregation of glucagon-like peptide 1 and its analogues
Aggregation and physical instability of peptide-based drugs poses a great challenge to the pharmaceutical industry. Glucagon-like peptide 1 (GLP-1) is a hormone that is used in the treatment of type-2 diabetes. However, GLP-1 has a short half-life *in vivo* and it is prone to aggregate which …
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IN VITRO AND IN VIVO KINETIC MODELING OF DIAZEPAM METABOLISM
… plays an important role in drug absorption and drug elimination. Therefore, it is crucial to understand the mechanism and kinetics of drug metabolism by various drug-metabolizing enzymes (DMEs). Cytochrome P450 enzymes (CYPs) are responsible for the metabolism of more than 60% of the top 200 …
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Electrochemical and thermochemical destruction of chlorinated solvents
… to destroy liquid chlorinated solvents, and a thermochemical technique was invented to reduce gas-phase chlorinated solvents to hydrocarbons. The developed electrochemical method belongs to the most potential technique for wastewater treatment--only electrochemical method is possible to …
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Engineering electroresponsive layer-by-layer thin films
… layer-by-layer (LbL) polymer films and polymer nanocomposite films were investigated as model systems for electrically triggered drug delivery applications and "mechanomutable" surface coating applications. Two strategies were implemented in the design of these electroresponsive …
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Design and Electrochemical Performance of Sodium-Based Batteries
… energy storage solutions are in great demand for applications such as vehicle electrification and electricity generation from renewable sources. Lithium-based batteries have emerged as strong contenders due to their high energy density and stability. However, their reliance on scarce …
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