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Aspects of the calcium carbonate-water interfaceBrown, Christopher A. January 1992 (has links)
The channel flow method has established the net dissolution kinetics of calcite single crystals at high pH (7.7-9.7) and varying bulk Ca<sup>2+</sup> concentrations (0-10 mM), using wide ranges of solution flow rates (10<sup>-3</sup>-0.3 cm<sup>3</sup> s<sup>-1</sup>). Literature rate equations were in poor agreement with experiment. Modelling with the following mechanism, where Ca<sup>2+</sup> and CO<sub>3</sub><sup>2-</sup> undergo Langmuirian adsorption: Ca<sup>2+</sup><sub>(aq)</sub> ⇄ Ca<sup>2+</sup><sub>(ads)</sub> CO<sup>2-</sup></sub>3 (aq)</sub> ⇄ CO<sup>2-</sup><sub>3 (ads)</sub> Ca(sup>2+</sup></sub>(ads)</sub> + CO<sup>2-</sup><sub>3 (ads)</sub> ⇄ CaCO<sub>3 (ads)</sub> CaCo<sub>3 (ads)</sub> → CaCo<sub>3 (lattice)</sub> and the consequent rate law J<sub>net</sub>/mol cm<sup>-2</sub>s<sup>-1</sup> = k<sub>p</sub>K<sub>Ca</sub>K<sub>CO<sub>3</sub></sub> {K<sub>sp</sub> - [Ca<sup>2+</sup>]<sub>o</sub>[CO<sup>2-</sup><sub>3</sub>]<sub>o</sub> (1 + K<sub>Ca</sub>[Ca<sup>2+</sup>]<sub>o</sub>)(1 + K<sub>CO<sub>3</sub>[CO<sup>2-</sup><sub>3</sub>]<sub>o</sub>) gave excellent agreement with experiment under all conditions studied. This mechanism is shown to explain all literature streaming potential, electrophoresis and kinetic salt effect data. Dissolution of calcite under the above conditions was strongly inhibited by Mg<sup>2+</sup> and fully deprotonated forms of succinic acid, 2-sulphobutanedioic acid, phthalic acid and maleic acid. Mechanisms were established; for the maleate dianion, the inhibition was due to the blocking of the dissolution sites at which CaCO<sub>3</sub> units are incorporated into the crystal lattice. For the other ions, inhibition arose from competitive Langmuirian adsorption either between CO<sub>3</sub><sup>2-<sup> and the anions, or between Ca<sup>2+</sup> and Mg<sup>2+</sup>. A new method to quantify the inhibited dissolution of particulate CaCO<sub>3</sub> (=10 μm) via enhanced mass transport of solution to the rotating disc electrode, due to the rotation of the particles in the diffusion layer, has been established. Good agreement was found with that measured independently using the channel flow cell. A.c. impedance spectroscopy has been used to characterise scaled (CaCO<sub>3</sub>) steel tubes. Results provide scope for (i) monitoring scale growth, and (ii) use in safety control devices for alerting to the scaling of pipe-work.
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Topics in Chemical Reaction Network TheoryJohnston, Matthew 09 December 2011 (has links)
Under the assumption of mass-action kinetics, systems of chemical reactions can give rise to a wide variety of dynamical behaviour, including stability of a unique equilibrium concentration, multistability, periodic behaviour, chaotic behaviour, switching behaviour, and many others. In their canonical papers, M. Feinberg, F. Horn and R. Jackson developed so-called Chemical Reaction Network theory which drew a strong connection between the topological structure of the reaction graph and the dynamical behaviour of mass-action systems. A significant amount of work since that time has been conducted expanding upon this connection and fleshing out the theoretical underpinnings of the theory.
In this thesis, I focus on three topics within the scope of Chemical Reaction Network theory.
1. Linearization: It is known that complex balanced systems possess within each invariant space of the system a unique positive equilibrium concentration and that that concentration is locally asymptotically stable. F. Horn and R. Jackson determined this through the use of an entropy-like Lyapunov function. In Chapter 4, I approach this problem through the alternative approach of linearizing the mass-action system about its equilibrium points. I show that this approach reproduces the results of F. Horn and R. Jackson and has the advantage of being able to give explicit exponential bounds on the convergence near equilibria.
2. Persistence: A well-known limitation of the theory is that the stabilities of the positive equilibrium concentrations guaranteed are locally limited. The conjecture that the equilibrium concentrations of complex balanced systems are global attractors of their respective invariant spaces has become known as the Global Attractor Conjecture and has received significant attention recently. This theory has been significantly aided by the realization that trajectories not tending toward the set of positive equilibria must tend toward the boundary of the positive orthant; consequently, persistence is a sufficient condition to affirm the conjecture. In Chapter 5, I present my contributions to this problem.
3. Linear Conjugacy: It is known that under the mass-action assumption two reaction networks with disparate topological structure may give rise to the same set of differential equations and therefore exhibit the same qualitative dynamical behaviour. In Chapter 6, I expand the scope of networks which exhibit the same behaviour to include ones which are related by a non-trivial linear mapping. I have called this theory Linear Conjugacy theory. I also show how networks exhibiting a linear conjugacy can be found using the mixed integer linear programming (MILP) framework introduced by G. Szederkenyi.
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Chemical reaction and interphase mass transfer in gas fluidized beds.Chaverie, Claude. January 1973 (has links)
No description available.
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Human lactate kinetics : training effects / by Jonathan David Buckley.Buckley, Jonathan David January 1997 (has links)
Bibliography: leaves 178-210. / xiii, 230 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This thesis examines the effects of endurance exercise training on whole body blood lactate removal, and the production and removal of blood lactate by skeletal muscle. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physiology, 1997?
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Kinetics of gas phase reactions of perfluoroalkyl iodides / Czeslaw GrygorcewiczGrygorcewicz, C. January 1969 (has links)
Includes bibliographical references / 125 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1969
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The synthesis of perfluoroalkyl derivatives of some metals and metalloids / Brian James PullmanPullman, Brian James January 1963 (has links)
Typewritten / Includes bibliographical references / 232 leaves ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1964
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Reaction kinetics and mechanisms of low temperature SO₂ removal by dry calcium-based sorbentsBen-Said, Lotfi. January 1993 (has links)
Thesis (Ph. D.)--Ohio University, November, 1993. / Title from PDF t.p.
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Dibenzoylmethane induced cell cycle arrest in human colon cancer cells and its pharmacokinetic disposition in the ratsHong, Jin-Liern. January 2007 (has links)
Thesis (M.S.)--Rutgers University, 2007. / "Graduate Program in Pharmaceutical Science." Includes bibliographical references (p. 69-71).
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Cationic polymerization of glycidyl ethers and furans : improved electron beam and UV cured epoxy networks /Lee, Jihean. Palmese, Giuseppe R. January 2007 (has links)
Thesis (Ph.D.)--Drexel University, 2007. / Includes abstract and vita. Includes bibliographical references.
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Low temperature conversion of SO₂ to SO₃Tanneer, Srinivas R. January 2000 (has links)
Thesis (M.S.)--Ohio University, November, 2000. / Title from PDF t.p.
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