Graduation date: 1991

This thesis describes a fundamental study of the miscibility and the nature of the interface between components of core-shell polymer blends using the technique of Fluorescence Resonance Energy Transfer (FRET) coupled with data analysis that involves Monte-Carlo simulations. Our aim in this study was to develop a fundamental methodology to quantitatively determine the width of the interface between the two components in binary polymer blends. At the current state of the art, data analysis of FRET experiments requires translational symmetry. In the system under study, uniform core-shell structures satisfy this criterion. Thus, in this work our focus was directed toward the study of a blend system with a core-shell structure. For this FRET study, I have identified a number of potential donor and acceptor dye pairs that fluoresce in the visible range of the spectrum and can be chemically attached to polymers. Among them, I selected, as the donor and the acceptor, a pair of naphthalimide dyes that have not previously been used for FRET experiments. Model experiments showed that while the fluorescence decay profile of the donor chromophore was exponential in solution, it was not exponential in polystyrene (PS) or poly(methyl methacrylate) (PMMA) films. Thus, I carried out refinements to existing FRET theory to interpret the data generated by using these dyes. Also, I derived a new model to predict the fluorescence intensity of non-exponential decaying donor dyes in core-shell systems. I selected a model system composed of a PS core surrounded by a PMMA shell. The PS core particles were prepared by miniemulsion polymerization to obtain cross-linked PS particles with a narrow size distribution. Seeded emulsion polymerization under starved-fed condition was employed to synthesize monodisperse dye-labeled core-shell particles. The extent of miscibility and the nature of interface between the core and the shell polymers were retrieved from a combined study by Monte-Carlo simulations and analysis of the donor fluorescence intensity decays. Agreement between the retrieved interface thickness and the literature data on PS-PMMA validates the methodology developed here for the use of such donor dyes in FRET studies on polymer blends.

Syftet med studien är att studera lärarens intentioner och hur elever uppfattar lärarens budskap inom kemi på gymnasieskolan. Metoden jag använt mig av är Stimulated Recall. Genom att jag observerat och filmat lektionerna, där jag har träffat lärare och elever var för sig för att reflektera över lektionstillfället. De reflektionsfrågor jag använt mig av är mallen för en så kallad CoRe, som Berry, Loughran & Mulhall (2003) från Australien har utformat. Det är ett reflektionsverktyg men även ett sätt för att exemplifiera PCK (pedagogical content knowledge). PCK är ett begrepp som didaktikforskare använder för att beskriva de egenskaper som en bra lärare skall besitta för att kunna vägleda elever rätt i specifika ämnesområden. Forskare menar att läraren måste ha en god teoretisk grund men även en bra grund i pedagogik. Resultatet av studien visar att, om kollegor delger sina erfarenheter till de som är mindre erfarna ger det en utveckling av lärarens PCK och det innebär att lärarens intentioner bättre når fram till eleverna. Responsen från eleverna är mycket positiv och eleverna har en positiv inställning inför kemi, även om många av eleverna tycker att ämnet i sig är ganska svårt.

The overriding objective of core French (CF) teaching in Canada since the National Core French Study (NCFS) is that of communicative competence (R. Leblanc, 1990). Results from the traditional form of CF, though, suggest that students are not developing desired levels of communicative competence in the drip-feed (short daily periods) model (Lapkin, Harley, & Taylor, 1993). The present study aims to investigate the role of compacted second language program formats in promoting higher levels of language proficiency and achievement among elementary core French students; in particular, the study investigates the pedagogic approach, based on the principle that longer class periods should facilitate a more communicative/ experiential teaching approach. Students in three Grade 7 classes served as participants. Two of the classes served as the compacted experimental classes, and the other as a comparison class. Pre-tests, immediate post-tests and delayed post-tests recorded differences in student achievement. A multi-dimensional, project-based curriculum approach was implemented in all three classes, and was recorded by teacher observations in her daybook and daily journal. Student attitudes toward their CF program format and their self-assessed language proficiency were measured during recorded focus group sessions and on student questionnaires. Parental and teacher perceptions of student attitudes were measured using a short survey. Results indicate that students in both the compact and comparison classes performed similarly, with few significant differences in measured language growth or retention over time. Parents of all classes indicated satisfaction with the teaching and learning activities, and with the program format in which their child was enrolled. Excerpts from the teacher daybook and reflective journal demonstrated that communicative activities fostering student interaction in the target language were more frequently and readily implemented in the longer compact CF periods. Students generally stated a preference for the program format in which they were enrolled, although only students in the compact classes outlined pedagogic reasons in support for their preference. Additionally, most students self-assessed a higher level of language competence than in previous years, which students in the compact (experimental) classes attributed to the longer class periods, stating that they promoted task completion, group work, in-depth projects and communicative activities.

The orbit of Phobos exhibits an along-track acceleration, which suggests energy dissipation in the Mars-Phobos system. We hypothesize that the inferred dissipation occurs within Mars. We explore the response of a layered, incompressible Maxwell viscoelastic Mars to tidal forcing by Phobos using normal mode relaxation theory. Our results elucidate the general behavior of a tidally forced viscoelastic body, and have implications for the viscoelastic structure of Mars. We find the real and imaginary part of the degree-two tidal Love number for Mars to be 0.168 and -9.32x10^−4 respectively. Models which satisfy these and other constraints have either: a fluid core with radius 2040 km and density 5410 kg/m^3; or an elastic inner core with radius 1200 km and density 6700 kg/m^3, along with a fluid outer core with thickness 850 km and density 4850 kg/m^3. These findings support previous hypotheses that Mars has at least a fluid outer core.

The orbit of Phobos exhibits an along-track acceleration, which suggests energy dissipation in the Mars-Phobos system. We hypothesize that the inferred dissipation occurs within Mars. We explore the response of a layered, incompressible Maxwell viscoelastic Mars to tidal forcing by Phobos using normal mode relaxation theory. Our results elucidate the general behavior of a tidally forced viscoelastic body, and have implications for the viscoelastic structure of Mars. We find the real and imaginary part of the degree-two tidal Love number for Mars to be 0.168 and -9.32x10^−4 respectively. Models which satisfy these and other constraints have either: a fluid core with radius 2040 km and density 5410 kg/m^3; or an elastic inner core with radius 1200 km and density 6700 kg/m^3, along with a fluid outer core with thickness 850 km and density 4850 kg/m^3. These findings support previous hypotheses that Mars has at least a fluid outer core.

The overriding objective of core French (CF) teaching in Canada since the National Core French Study (NCFS) is that of communicative competence (R. Leblanc, 1990). Results from the traditional form of CF, though, suggest that students are not developing desired levels of communicative competence in the drip-feed (short daily periods) model (Lapkin, Harley, & Taylor, 1993). The present study aims to investigate the role of compacted second language program formats in promoting higher levels of language proficiency and achievement among elementary core French students; in particular, the study investigates the pedagogic approach, based on the principle that longer class periods should facilitate a more communicative/ experiential teaching approach. Students in three Grade 7 classes served as participants. Two of the classes served as the compacted experimental classes, and the other as a comparison class. Pre-tests, immediate post-tests and delayed post-tests recorded differences in student achievement. A multi-dimensional, project-based curriculum approach was implemented in all three classes, and was recorded by teacher observations in her daybook and daily journal. Student attitudes toward their CF program format and their self-assessed language proficiency were measured during recorded focus group sessions and on student questionnaires. Parental and teacher perceptions of student attitudes were measured using a short survey. Results indicate that students in both the compact and comparison classes performed similarly, with few significant differences in measured language growth or retention over time. Parents of all classes indicated satisfaction with the teaching and learning activities, and with the program format in which their child was enrolled. Excerpts from the teacher daybook and reflective journal demonstrated that communicative activities fostering student interaction in the target language were more frequently and readily implemented in the longer compact CF periods. Students generally stated a preference for the program format in which they were enrolled, although only students in the compact classes outlined pedagogic reasons in support for their preference. Additionally, most students self-assessed a higher level of language competence than in previous years, which students in the compact (experimental) classes attributed to the longer class periods, stating that they promoted task completion, group work, in-depth projects and communicative activities.

Podpiera (2006) found that compliance with Basel Core Principles (BCP) in banking provisions has a direct positive effect on bank performance. Using Non-performing Loans (NPL) ratio and Net-Interest Margin (NIM) as indicators of bank performance, his panel data from 1998 to 2002 with 65 different countries proved that higher compliance results in better bank performance and soundness. This paper is a reexamination of this relationship in a more recent time period from 2006 to 2010 when another global financial crisis took place. I found evidence that the positive relationship between BCP compliance and bank performance continues to be true.

This thesis describes a fundamental study of the miscibility and the nature of the interface between components of core-shell polymer blends using the technique of Fluorescence Resonance Energy Transfer (FRET) coupled with data analysis that involves Monte-Carlo simulations. Our aim in this study was to develop a fundamental methodology to quantitatively determine the width of the interface between the two components in binary polymer blends. At the current state of the art, data analysis of FRET experiments requires translational symmetry. In the system under study, uniform core-shell structures satisfy this criterion. Thus, in this work our focus was directed toward the study of a blend system with a core-shell structure. For this FRET study, I have identified a number of potential donor and acceptor dye pairs that fluoresce in the visible range of the spectrum and can be chemically attached to polymers. Among them, I selected, as the donor and the acceptor, a pair of naphthalimide dyes that have not previously been used for FRET experiments. Model experiments showed that while the fluorescence decay profile of the donor chromophore was exponential in solution, it was not exponential in polystyrene (PS) or poly(methyl methacrylate) (PMMA) films. Thus, I carried out refinements to existing FRET theory to interpret the data generated by using these dyes. Also, I derived a new model to predict the fluorescence intensity of non-exponential decaying donor dyes in core-shell systems. I selected a model system composed of a PS core surrounded by a PMMA shell. The PS core particles were prepared by miniemulsion polymerization to obtain cross-linked PS particles with a narrow size distribution. Seeded emulsion polymerization under starved-fed condition was employed to synthesize monodisperse dye-labeled core-shell particles. The extent of miscibility and the nature of interface between the core and the shell polymers were retrieved from a combined study by Monte-Carlo simulations and analysis of the donor fluorescence intensity decays. Agreement between the retrieved interface thickness and the literature data on PS-PMMA validates the methodology developed here for the use of such donor dyes in FRET studies on polymer blends.

In this paper. I analyze how political, economic, and administrative issues were major factors in the BC Liberal government's creation of a complex hybrid operating structure for BC Ferries. The model evolved as the result of a number of circumstances, including the former NDP government's "fast ferry" debacle and the Liberal government's decision to conduct a Core Services Review of all government services, including those provided by Crown corporations. BC Ferries' new structure has similarities to other administrative models that have been introduced as a result of New Public Management initiatives and other factors in a number of Westminster jurisdictions. The resulting operating entities are having significant impacts on the nature and scope of public accountabilities and on reporting structures.