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 20 for “"coupling conditions"”.
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Macroscopic Coupling Conditions with Partial Blocking for Highway Ramps
… connected by a junction. We compare the known coupling conditions for the evolution of traffic at the junction and suggest a novel improvement to the existing conditions. That is, we resolve the spurious effects that arise in standard models, namely clogging of the main highway and vehicle …
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Analytical Modeling and Design of High-Efficiency Input-Output Harmonic Tuned Microwave Power Amplifiers
… like device nonlinearity, mismatch, mutual coupling, and channel temperature for high efficiency PA modeling, design, and reliable performance.In this thesis, power amplifier design methodologies have been comprehensively investigated by exploring and exploiting the input and output …
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The arylation of 2-pyrones and related heterocycles
… In Chapter 3, the development of cross-coupling conditions for the cyclised 3-chloro-2-pyrone is discussed. Following on from this, more generally applicable, environmentally friendly cross-coupling conditions evolved to allow the application of green chemistry principles to the …
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Beam-Steerable and Reconfigurable Reflectarray Antennas for High Gain Space Applications
… for a couple of cases and the effects of coupling conditions in conjunction with incidence angles are demonstrated. The presented theory provides explicit physical intuition and guidelines for efficient and accurate reflectarray design. In chapter 4, tunable reflectarray elements …
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Part I: Rapid Synthesis of Dendrimers by an Orthogonal Coupling Strategy. Part II: Design, Synthesis, and Characterization of Hydrogen-Bond Mediated Self-Assembling Dendrimers
… were rapidly synthesized using an orthogonal coupling strategy. Fourth generation dendron 71 was prepared in four steps by sequential use of two AB$\sb2$ building blocks 66 and 67 under Mitsunobu esterification and Sonogashira coupling conditions. Further accelerated growth was achieved by …
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A. Discovery of novel reactivity under the Sonogashira reaction conditions B. Synthesis of functionalized BODIPYs and BODIPY-sugar conjugates
… attempts to synthesize substituted enediynes, coupling reactions between terminal alkynes and 1,2-cis-dihaloalkenes under the Sonogashira reaction conditions failed to give the corresponding substituted enediynes. Under these conditions, terminal alkynes underwent self-trimerization or …
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Visual vs auditory coupling in dyads under different task difficulty
… coupled. Previous research suggests that coupling between two individuals can take place auditorily or visually during intentional and unintentional tasks (i.e., Richardson, Marsh, & Schmidt, 2005; Gorman, Amazeen, Crites, & Gibson, 2017). This experiment examined coupling by using a …
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Investigations Into Cross-Coupling of Secondary Organoboronic Esters
… viable substrates in the Suzuki-Miyaura cross-coupling reaction; however under recently reported conditions from the Crudden group1, which includes the addition of silver oxide to a palladium/phosphine catalyst system, this coupling can now be achieved. This thesis centres on optimizing the …
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Stereospecific Csp3 cross-coupling for modular polyketide synthesis
Iterative cross-coupling represents a simple strategy for the synthesis of functional molecules that is inherently automatable. However, an important limitation to this platform is an inability to generate Csp3-rich, stereochemically complex molecules due to challenges in the coupling of alkyl …
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Pd-Catalyzed Cross-Coupling, High Throughput Experimentation, and Machine Learning
… Ligands Promote Pd-Catalyzed C–S Cross-Coupling Reactions at Room Temperature with Soluble Bases. The Pd-catalyzed cross-coupling of thiols with aromatic electrophiles is a reliable method for the synthesis of aryl thioethers, which are important compounds for pharmaceutical and …
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Solid Phase Synthesis of M-Phenylene Ethynylene Oligomer Heterosequences
… support, and uses palladium-catalyzed cross-coupling reactions to form the desired mPE backbone in a monomer-by-monomer fashion. In order to rapidly access hexameric oligomers in a period of one to two days, efforts were taken to limit the need for deprotection steps and ensure cross-coupling …
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Dynamic simulation of nuclear hydrogen production systems
… three models for gas dynamics and two set of coupling conditions for boundary variables were tested in JACOBIAN, an equation-based simulator. The three models for gas dynamics in combination with a novel approach to set coupling conditions for boundary variables were able to represent the …
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Automated Synthesis of Duplex-Forming Recognition-Encoded Oligomers
… acceptor (A) recognition units, under microwave conditions. Major side products were identified using liquid chromatography-mass spectrometry (LCMS) and the undesired reactions were supressed by the choice of resin, solvent and coupling conditions. A 42-mer REMO was synthesised and purified by …
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I. Reaction mining—a next-generation platform for reaction discovery II. Rapid, anhydrous, homogenous Suzuki-Miyaura cross-coupling of aryl and alkylboronates
… for aryl-aryl and B-alkyl Suzuki-Miyaura cross-coupling of boronic esters and boronates. Chapter 1 describes previous efforts by Sarlah and Shved to accelerate the reaction discovery process with the combination of data science, HTE, and artificial isotope distributions. A workflow was …
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Micro-assembly of integrated photonic devices using a high accuracy transfer printing process
… manner, demonstrating variation in resonant coupling conditions with respect to the lateral coupling offset. Further to this, the TP method provides a means to produce 3D device architectures without any limiting multi-step full wafer bonding methods. By vertical assembling 3D stacked …
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Synthetic efforts toward the eastern hemisphere of theonellamide C
… of protecting group manipulations. The optimized conditions for the HWE reaction of (4S,5R)-tert-butyl 5-formyl-4-(2-(4-methoxyphenoxy)ethyl)-2,2-dimethyloxazolidine-3-carboxylate with (E)-diethyl (4-phenylbut-3-en-2-ylphosphonate led to a 40% yield with a 4.5:1 E/Z ratio of olefin products. …
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Enhanced digital modulation of coherently coupled vertical cavity laser arrays: theory and application
… rate equations. The effects of complex coupling coefficient, associated with index-antiguided and gain-guiding, on coupled laser dynamics, are explored. We study multiple modulation techniques, including single-, in-sync, and out-of-sync modulation using pole-zero analysis. We discover …
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DESIGN OF DYNAMIC CAPACITIVE WIRELESS POWER TRANSFER SYSTEMS FOR ELECTRIC VEHICLE CHARGING
… a novel technique using metasurface-based coupling plates (referred to as ‘metacoupler’) to reduce the fringing electricfields outside the charging pads is also proposed. Different physical implementations of the metacoupler that enable significant fringing field reduction while maintaining …
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New frontiers in allylic C––H amination via palladium/sulfoxideoxazoline catalysis
… all these reactions proceed via near ligandless conditions (e.g. reversibly coordinating sulfoxide ligands) and require benzoquinone oxidant to coordinate to Pd metal to promote the functionalization step (known as “serial ligand catalysis). This mechanism with sulfoxide ligands renders catalyst …
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Loosely Coupled Transformer and Tuning Network Design for High-Efficiency Inductive Power Transfer Systems
… is built and tested under different gap and load conditions. Peak IPT system DC-DC efficiencies of 98% and 96.6% are achieved with 4-cm and 8-cm air gap conditions, which is comparable to the conventional plug-in type or wired charging systems for EVs. A long-hour test with real EV batteries is …