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Hydrogen fuel cell applications are set to ameliorate the world's energy woes, yet there still exists problems that need to be overcome in terms oftheir fuelling. While compressed storage, cryogenic storage, chemical storage, and adsorptive storage solutions exist, none meet the requirements that are needed to facilitate a replacement for the gasoline powered automobile. Metal hydrides have been long studied as an alternative method for storing hydrogen safely and efficiently, with significant developments being made in advanced alloys. While this research is beneficial, it was theorized that an externally applied magnetic field might augment the storage properties of existing magnetically susceptible metal hydrides, without trial and error alloy development. Constant volume hydrogen absorption experiments were conducted using LaNi5 in order to test this theory. A known amount of LaNi5 was exposed to hydrogen, with the absorption equilibrium data collected over a period of 6 hours. An equal sample was then exposed to hydrogen with a 0.7 Tesla applied field applied to the sample. There was a distinct difference between the absorption curves of the two equal samples, with the sample under the influence of the magnetic field achieving an absorption of only 0.60% wt. in comparison with the unmodified sample which absorbed 0.88% wt. It was concluded that the presence of an externally applied magnetic field has a negative effect on the overall capacity of LaNis through the prevention of a shift in the inner lattice structure of LaNis that would otherwise permit an increased hydrogen capacity. This effect while negative in terms of overall storage capacity could have a possible benefit in terms of the desorption of the stored hydrogen, as the magnetic field could be used in lieu of an increase in temperature in order to drive the hydrogen from the fully filled structure. / Thesis / Master of Applied Science (MASc)

The construction of a field emission ion source and its adaptation to a mass spectrometer is described. The problems involved and the advantages of such an ion source are discussed. / Thesis / Master of Science (MS)

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Much of the research investigating color as an image characteristic for enhancing recognition memory has focused on comparisons between black-and-white images and full color images. These comparisons have only recently been extended to differentiate how color impacts learners of different cognitive style and in particular how color influences field dependency. Learners predisposed to field-dependence continually demonstrate a lower capacity than field-independent learners in terms of performance tasks where organizing or restructuring visual information is required. By using color as a mechanism to highlight objects within a visual field, we potentially increase figure-ground separation, which may help facilitate learning for field-dependents in instances where visual information is present. Thus this study undertook to examine the effects highlight color offers as a means of addressing individual learner differences. Undergraduate students were identified on the field-dependence-independence continuum using the Group Embedded Figures Test. Each student then received an instructional lesson on the anatomy of the heart where images were presented in one of four color variations; black-and-white, full realistic color, realistic highlight color, or contrived highlight color. All participants were given two tests following the instructional lesson, one for identification and the other for terminology. Test scores for the two tests indicated no differences for any variation of the color variable. Field-independents were observed to outperform field-dependents in all instances for both tests. / Ph. D.