The formation of iminyl radicals from a range of precursors, including hydrazone imines and oxime ethers, under FVP conditions is well documented in the literature.1 Once formed, the iminyl radical can undergo cyclisation onto various aromatic ring systems including phenyl rings, thiophenes and furans to form new fused aromatics.2 The aim of this thesis was to expand the scope of cyclisation of iminyl radical onto pyrrole-type rings and 2-azole rings, generating novel heterocyclic cores via pyrolysis of the corresponding oxime ether precursors. In addition, the cyclisation of iminyl radicals onto C-C double bonds was investigated and afforded isoquinolines shown in Scheme II, providing a new way to synthesise these heterocyclic cores. Mechanistic predictions were supported by DFT calculations in which the thermodynamics and kinetics of the systems were established and the products of iminyl cyclisation reactions were characterised using a range of 2D NMR experiments.

No description available.

An introduction is presented to the nature of polarized and non-polarized transient spin resonance signals, produced by flash-photolysis e.s.r., followed by a description of the equipment used for experimental work. Theories of Chemically Induced Dynamic Electron Spin Polarization are reviewed and various models introduced to illustrate these concepts. A description is given of the first thorough investigation into the effect of CIDEP polarization transfer down a free radical chain and expands upon the consequences of hyperfine-dependent relaxation and the relative signs of coupling constants in various radical species. It concludes with an account of two methods of kinetic analysis which are the first practical demonstrations of their kind, and employ extension of expressions developed in earlier chapters. Studies are made of the CIDEP behaviour of radicals in high viscosity paraffins. A reassessment of previous published work is made: anomalous polarization behaviour was found to have been over-compensated for. A new method of extracting values for T₁ and T<sub>2,/sub> is demonstrated for strong transient e.s.r. signals. A collection of experimental data relating to the previously unexplained absorptive polarization observed in the spectrum of ketyl radicals and the longer-time phase inversion of hyperfine-dependent CIDEP is given. The operation of Triplet Mechanism CIDEP in the ketyl radical systems is ruled out and a division of radicals into geminately formed and free-encounter pairs is shown to be incapable of explaining the observed phase changes. In its place a cross-relaxational mechanism, drawing upon simultaneously generated nuclear spin polarization is advanced. Conclusions are drawn that this may account for both anomalies. Lastly a photochemical application of CIDEP is demonstrated; two different reaction intermediates are identified upon photolysis of ortho phthalaldehyde, depending upon the quenching conditions. A reaction scheme consistent with all experimental data is proposed. A brief comment upon the photo-chemistry of indan 2-one concludes this work.

Due to advances in capacity, speed, and economics, NAND-based flash memory technology is increasingly integrated into all types of computing systems, ranging from enterprise servers to embedded devices. However, due to its unpredictable up-date behavior and time consuming garbage collection mechanism, NAND-based flash memory is difficult to integrate into hard-real-time embedded systems. In this thesis, I propose a performance model for flash memory garbage collection that can be used in conjunction with a number of different garbage collection strategies. I describe how to model the cost of reactive (lazy) garbage collection and compare it to that of more proactive schemes. I develop formulas to assess the schedulability of hard real- time periodic task sets under simplified memory consumption models. Results show that I prove the proactive schemes achieve the larger maximum schedulable utilization than the traditional garbage collection mechanism for hard real-time systems in flash memory.

Thesis (Ph. D.)--University of Texas at Austin, 2007. / Vita. Includes bibliographical references.

Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2009. / Includes bibliographical references (p. 47-50).

Thesis (M.S.)--Tennessee Technological University, 2009. / Title from title page screen (viewed on June 29, 2010). Bibliography: leaves 51-56.

Thesis (Ph. D.)--University of Texas at Austin, 2008. / Vita. Includes bibliographical references.

The purpose of this thesis research was to understand the recovery and resilience of wetland-community to flash flood disasters and its associated risks in the north-eastern part of Bangladesh. I conducted my study using a case study approach following an interdisciplinary research paradigm. It was found that wetland-community is extremely vulnerable to flash flood hazards - both in biophysical and social terms. However, they possess certain coping thresholds, and are resilient to disaster losses. The adaptive capacity of the local communities has been severely curbed by a number of socio-ecological, economic, and political factors, leading to natural resource degradation, marginalization and exclusion of the poor from common pool resources by powerful groups. Response capacities of local institutions were severely constrained by their limited relative autonomy. For building resilience, i) effective management and access of the poor to natural resources, and ii) enhancing autonomy of local institutions are required. / February 2016

Hoy en día son escasas las herramientas en Internet que permiten crear y compartir diagramas en línea. Por eso, esta es una buena oportunidad de construir un sitio web que tenga dicha funcionalidad, ya que a pesar de las dificultades que se puedan presentar promete una serie de ventajas, por ejemplo ser accesible desde cualquier PC conectado a Internet y poder colaborar con otros usuarios alrededor del mundo. En esta memoria se implementó un sitio web que permite realizar diagramas de redes de Petri en línea, grabarlos, almacenar distintas versiones, exportarlos a formato PNG y compartir documentos con otros usuarios. Además, se intentó proveer de herramientas que permitan la colaboración asíncrona de varios usuarios sobre un mismo documento. Para ello utilizamos Stick-Ons aplicados a diagramas (lo cual permite tener un control local de versiones). También se implementó una funcionalidad poco común: es posible “entrar” a un elemento del diagrama y obtener un sub diagrama, por ejemplo para tener mayor detalle. Esta funcionalidad se usó para poder representar sub-procesos en las redes de Petri. En el trabajo realizado fueron revisadas las posibilidades gráficas que tiene el browser, con que herramienta podemos implementar los servicios necesarios y que base de datos vamos a utilizar. Se eligió Flash (Flex) para el desarrollo de la interfaz, PHP para los servicios web y MySql como base de datos. Posteriormente diseñamos de qué manera deberíamos aplicar los StickOns en el caso de diagramas, en donde proponemos la forma en que se pegarán y el feedback visual que tendremos al despegarse el Stick-On. Finalmente se implementa el sitio web y el editor de diagramas, incorporando los Stick-Ons como parte de su funcionalidad. Los resultados finales se ilustran creando algunas redes de Petri tomadas del libro "Workflow Managment" en el sitio web. Además se muestra un ejemplo del uso de Stick-Ons hecho también dentro de la aplicación creada. Concluimos que los Stick-Ons son una herramienta adecuada para llevar un control de cambios local dentro de un diagrama y que si se mantiene dentro de rangos normales de operación, el proyectar una sombra cuando se despega un StickOn da una buena indicación visual del elemento despegado.