Title: Laser Induced Self-Action Phenomena in a Photopolymerisable Medium, Author: Ana B. Villafranca, Location: Mills
The period from 1909 to 1987 could be characterized as achieving notable successes in the management of the Great Lakes waters. The successes during this interval provide important lessons for shared water resources elsewhere. However, the period from 1987 forward saw more obstacles in restoring and maintaining the waters in the Great Lakes
basin. Since 1987, progress toward delisting and r...
Laser Induced Self-Action Phenomena in a Photopolymerisable Medium
The nonlinear propagation of a visible, continuous wave laser beam in a photopolymerizable organosiloxane was studied at intensities ranging across 10 orders of magnitude (3.2x10-5 to 12732 W /cm2). The process was characterised in detail through spatial intensity profiles of the beam, temporal monitoring of its width and peak intensity combined with optical microscopy of the resulting self-...
Synthesis and Characterization of Well-Defined Dimethylaminoethyl Methacrylate Polyelectrolytes for Non-Viral Antisense Oligonucleotides Deliveries
Cationic polyelectrolytes have attracted growing attention in the field of non-viral
oligonucleotides (ONs) deliveries because of their ability to bind ONs by electrostatic
interactions for efficient cellular uptake. However the formation of electrostatic
polymer/ONs complexes and their biological effects are still poorly understood. The
relationships between polymer structure and compl...
Brittle-Ductile Shear Zones Northwest of the Grenville Front Mylonite Zone, Killarney, Ontario
Small shear zones located northwest of the Grenville Front Mylonite Zone exhibit both a brittle and ductile deformation history. Textures reveal that an earlier mylonitic rock has been overprinted by one which demonstrates textures typical of brittle cataclasis.
ductile deformation has occurred under greenschist facies conditions, while a later, brittle event has occurred below lowe...
Late Cretaceous Sponge Borings - Indicators of Salinity and Sedimentation Drumheller, Alberta
A detailed study of sponge boring morphotypes within the molluscan fauna of Upper Cretaceous estuarine sediments near Drumheller, Alberta provides information relevant to the
depositional environment. Problems with regard to utilizing Entobia as a paleoenvironmental indicator and as an indicator of salinity do not appear to be insurmountable.
Distributions and characteristics of as...
Regional Jointing Pattern Within the Surficial Glacial Sediments and Bedrock of South-Central Ontario
There is mounting pressure to find suitable disposal sites for both household and industrial waste in south-central Ontario as a solution to Metropolitan Toronto's growing 'garbage crisis'. New data indicate that the fine-grained glacial sediments of south-central Ontario, previously considered to be 'tight' and impermeable, are in fact penetrated by an extensive joint system. This thesis p...
Constitutive Modeling of Hexagonal Close Packed Polycrystals
There is a growing interest in magnesium and its alloys due to their high strength
to weight ratio. Magnesium is of particular interest to the automotive industry as a
consequence of the current pressure to reduce green house gas emissions from the
transportation sector through vehicle weight reduction. However, there is a lack of
knowledge concerning the formability of magnesium. As a ...
The Evolution of Gemomic and Non-Genomic Regulatory Mechanisms o fMitochondrial Lipid Oxidation in Fish
Research in the field of lipid metabolism has blossomed in recent decades,
particularly in terms of human metabolic disease. This has been studied mostly in
mammals despite the importance of lipid metabolism on the energetics and life history of
non-mammalian vertebrates such as fish. Fish have a large ecological and economic
impact but have received little attention in the area of lipid...
Living Polystyrene Anions Terminated with Difulvene
This project proposal is focused on the development of a novel class of Viscosity Index improvers. A bench-top method for living anionic polymerization has been set up and tested in many aspects. A new difulvene derivative, 1,4-di(6'-6'-methyl-fulvyl)benzene, was synthesized. The living anionic polymer chain was terminated on this difulvene. Cyclopentadiene groups were formed in the middle ...
Synthetic and Mechanistic Studies of Organo-Cobalt Clusters
Dicobalt octacarbonyl reacts with a wide variety of
molecules containing trichloromethyl functionalities to
yield carbynyl tricobalt nonacarbonyl clusters of the
general formula R-CCo 3 (CO) 9 . While these clusters have
been shown to undergo many reactions, mechanistic studies
on these systems are sparse. In particular, their rather
facile decarbonylation processes are not well under...
Synthesis of Short, Self-Complementary DNA Oligomers and Solution Studies of their Duplex Structure and Formation
A phosphotriester synthesis for short deoxy oligomers was developed based on the RNA synthesis developed in Neilson's laboratory. This synthesis parallels that of Catlin and Cramer (1973) but differs significantly in a number of procedures and reagents used and represents an overall improvement in every aspect of the previous method. This synthetic procedure allows the synthesis of sufficie...
Aboriginal Language Use and Socioeconomic Well-being: A Multilevel Analysis
This dissertation uses multilevel models to test the veracity of two
competing theories regarding the effect of Aboriginal language use on
socioeconomic well-being. The cohesion hypothesis suggests that
Aboriginal language use will contribute to a sense of ethnic identity and, in
turn, to socioeconomic prosperity. The ghettoization hypothesis suggests
that Aboriginal language use will ...
Healing the 'African Body' in the Age of Abolition? British Medicine in West Africa, circa 1800-1860
This investigation provides an in-depth examination of British and African
interactions in British West Africa within the field of health and medicine, circa 1800-
1860. It examines how Britons perceived, created, and understood Africans and their
bodies during a period of extensive and significant change. This assists our
understanding of one of the historical roots of racialized medici...
Solid State NMR Investigation of Electrolyte Materials For Hydrogen Fuel Cells
Today' s commercial proton exchange membranes for fuel cell applications use a
liquid electrolyte such as water to facilitate the conduction process. The vapour pressure
of water limits the operating temperature of a fuel cell, resulting in a decrease in
efficiency as the electrolyte evaporates. Anhydrous electrolytes such as acidified
polybenzimidazole or poly(vinyl-4-imidazole) are ab...
Information Systems Security Misbehaviour in the Workplace: The Effects of Job Performance Expectation and Workgroup Norm
Information systems (IS) security has become a major current issue for
organizations. It is generally understood that not only technology but also human factors
and control processes have a significant impact on organizational IS security. One of the
major human factors issues is end user behavior towards IS security. End users may
ignore security measures and by doing so they inadverten...
Codon Usage Bias, tRNA Modifications and Translational Selection in Bacteria
In this thesis, codon usage bias is studied in a large number of bacterial genomes.
The codon frequency of each codon is measured as a fraction of the total number of
codons for each amino acid, which can be used to calculate the potential selection
strength in a genome according to the population genetics theory of selection, mutation
and drift. It is assumed that codon frequencies in l...
Effects of Perceptions of Situational Strength in HR Practices on Job Attitudes and Business Unit Performance
Building on the work of Ostroff and Bowen (2000; 2004) and using situational
strength theory (Mischel, 1976) and the Attraction-Selection-Attrition model (Schneider,
1987), this study measures the degree to which employees perceive HR practices to
contribute to situational strength around strategic organizational goals (HR Strength).
The effect of these HR practice perceptions is examine...
Dynamic Models of Cognitive Radio Networks
A cognitive radio network is a multi-user system, in which different users compete for
limited resources in an opportunistic manner, interacting with each other for access
to the available resources. The fact that both users and spectrum holes (i.e., underutilized
spectrum subbands) can come and go in a stochastic manner, makes a cognitive
radio network a highly dynamic and challenging w...
Model-Based Predictive Control for Improving Stability and Transparency in Time-Delay Teleopertation
Prior research on time-delay bilateral teleoperation has mainly resulted in methods
that favor the robust stability of the system at the expense of its transparency.
In contrast, it is demonstrated in this thesis that carefully designed model-based
predictive controllers are able to achieve high levels of transparency while maintaining
teleoperation stability. This is accomplished by uti...
Synthesis and Nuclear Magnetic Resonance Studies of the Tetrakis (Tri-Para-Tolyl Phosphite) Nickel (0) Hydride System
This thesis is primarily concerned with an investigation of the reaction of tetrakis(tri-p-tolyl phosphite)nickel(0) with strong acids, using 1H, 31P and 2H NMR. The results differ from those previously obtained for similar reactions with other Ni(0) phosphites, in that both five and four-coordinate nickel hydrides are formed in concentrations sufficient for spectroscopic studies. The four-...
MacSphere is McMaster University’s Institutional Repository(IR). The purpose of an IR is to bring together all of a University's research under one umbrella, with an aim to preserve and provide access to that research. The research and scholarly output included in MacSphere has been selected and deposited by the individual university departments and centres on campus.
To contribute to McMaster's Institutional Repository, please sign on to MacSphere with your MAC ID. If you have any questions, please contact the Office of Scholarly Communication.
Students wishing to deposit their PhD or Masters thesis, please follow the instructions outlined by the School of Graduate Studies.