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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
131

The kinetics of the reaction of subtilisin BPN' with chloromethyl ketones in relation to its subsite specificity

Tippett, James Thomas 05 1900 (has links)
No description available.
132

Design, synthesis, and kinetics of novel acetylcholinesterase inhibitors

Thornton, Stephen S. 08 1900 (has links)
No description available.
133

Kinetic and mechanistic studies of reactions of atomic chlorine with haloalkanes

Piety, Charles Andrew 08 1900 (has links)
No description available.
134

The mechanism of the addition reaction of trimethylaluminum with benzophenone

Laemmle, Joseph Thomas 08 1900 (has links)
No description available.
135

Characterization and modification of fluorogenic substrate coated particles for use as enzyme probes

Olsen, Greta A. 08 1900 (has links)
No description available.
136

An analysis of the oregonator

Rufeger, Waltraud 05 1900 (has links)
No description available.
137

Part one: Kinetics of the deuterium exchange of substituted methyl acetates; Part two: Equilibrium in the isomerization of certain unsaturated compounds

Mahone, Louis Gates 12 1900 (has links)
No description available.
138

The effect of solvent on the rates of racemization and dissociation of the ferrous tris-(phenanthroline) ion

Van Meter, Francis Marshall 05 1900 (has links)
No description available.
139

Investigations of Asphaltene-Metal Interactions

Rudrake, Amit 11 February 2008 (has links)
Asphaltenes are the most polar fraction of petroleum that can precipitate due to changes in pressure, temperature and composition which may be encountered during petroleum production and transportation. The precipitated asphaltenes can subsequently deposit on the surfaces of production/transportation pipelines and clog the pipeline partially or completely. Why asphaltenes deposit on a metal surface remains a poorly understood topic. This thesis investigates asphaltene-metal interactions through physical and chemical characterization of the adsorption behaviour of asphaltenes on metal surfaces. A relatively novel technique called quartz crystal microbalance (QCM) was employed to study the kinetics of asphaltene adsorption and the data analyzed to estimate the adsorption isotherm. The X-ray photoelectron spectroscopy (XPS) technique was employed to determine the functional groups in bulk asphaltene and adsorbed asphaltene. The asphaltene adsorption experiments on metal surfaces were carried out in toluene medium at dilute concentration ranging 10-1500 ppm. A mathematical model was developed to analyze the XPS data, which was subsequently assessed to estimate the fractional coverage and thickness of adsorbed asphaltene. The isotherms generated from QCM and XPS experiments were compared and analyzed to estimate the free energy. Three different asphaltene samples were investigated – one sample was derived from Cold Lake bitumen and two others were supplied by DBR-Oilphase (a Schlumberger company) and termed as MD and HO2 asphaltenes. Most extensive experimentations and analyses were carried out for Cold Lake asphaltenes. The same procedure was applied for the other asphaltene samples. The kinetic analyses of Cold Lake and MD asphaltenes indicated that the adsorption process is diffusion controlled at initial times but follows a first-order kinetic rate law at longer times. MD asphaltenes exhibited higher equilibrium adsorbed amounts than Cold Lake asphaltenes. The XPS spectral analysis for MD and Cold Lake asphaltene revealed presence of carboxylic, thiophenic, thiol, pyridinic and pyrrolic type species. All adsorption isotherms could be described by follows Langmuir (type-I) isotherm. The estimated thickness of adsorbed asphaltene varied between 8 and 12 nm. / Thesis (Master, Chemical Engineering) -- Queen's University, 2008-02-08 15:46:54.204 / Schlumberger (DBR-Oil Phase), Edmonton, Canada, NSERC
140

Some studies of the reactions of aniliness with tetracyanoethylene.

Ngô, Phi-Nga. January 1973 (has links)
No description available.

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