Ng Wing-Chun Isabel. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (leaves 29-35). / Abstracts in English and Chinese. / List of Tables --- p.iv / Chapter CHAPTER ONE: --- INTRODUCTION --- p.1 / Chapter CHAPTER TWO: --- LITERATURE REVIEW --- p.2 / Implicit Motives --- p.2 / Relational Models Theory --- p.3 / Overview --- p.3 / Validation studies of the relational models theory --- p.6 / Applications of the relational models theory --- p.7 / Relationships between the Relational Models and Corresponding Motives --- p.8 / Affiliation motive and communal sharing --- p.9 / Power motive and authority ranking --- p.9 / Achievement motive and market pricing --- p.10 / Equality matching --- p.11 / Use of Standardized Role Dyads --- p.12 / Hypotheses --- p.13 / Significance --- p.14 / Chapter CHAPTER THREE: --- METHODOLOGY AND PROCEDURES --- p.15 / Overview --- p.15 / Research Approach and Design --- p.15 / Participants --- p.16 / Consent Procedures --- p.16 / Instrumentation --- p.16 / Thematic apperception test (TAT) --- p.16 / Methodological assumptions --- p.18 / Mode of relationship questionnaire (MORQ) --- p.19 / Chapter CHAPTER FOUR: --- RESULTS --- p.21 / Chapter CHAPTER FIVE: --- DISCUSSION --- p.23 / First Set of Hypotheses --- p.24 / Achievement motive --- p.24 / The two classical social motives --- p.25 / Second Hypothesis --- p.26 / Limitations and Future Directions --- p.27 / Conclusion --- p.28 / REFERENCES --- p.29 / APPENDIX

Nous explorons la variété des types d'interactions électrostatiques entre les charges dans des films minces à haute permittivité diélectrique, en analysant le cas particulier de l'interaction de Coulomb bidimensionnel logarithmique. Pour ce système, nous proposons une méthode de réglage du régime d'interaction à l'aide de l'électrode externe. Nous étudions ensuite les électrostatiques des charges étendues dans les matériaux diélectriques: des fils et des bandes chargés de manière homogène ou périodique. En s'appuyant sur les potentiels électrostatiques calculés de ces objets, nous abordons plusieurs applications possibles. Tout d'abord, nous suggérons la méthode non destructive pour mesurer la constante diélectrique des films minces déposés par un substrat par un condensateur à deux fils. Ensuite, nous étudions la formation des domaines dans des films ferroélectriques avec la polarisation dans le plan. L'apparition de la texture en domaines est causée soit par le bord chargé d'un échantillon de taille finie, soit par l'existence d'une paroi de domaine chargé dans le film. Les deux phénomènes augmentent l'énergie électrostatique de l'échantillon, ce qui stimule l'apparence des domaines pour minimiser l'énergie totale. Nous montrons que la taille équilibre du domaine dépend de la géométrie de l'échantillon et, pour les domaines dans le plan, elle viole la loi racine carrée de Kittel, étant inversement proportionnelle à l'épaisseur du film / We explore the various types of electrostatic interaction between charges in thin films with high dielectric permittivity, including the special case of the two-dimensional logarithmic Coulomb interaction, and propose a method of tuning the interaction regime using the external gate electrode. Changing the gate-to-film distance, one may alter the electrostatic screening length of the dielectric sample and control the ranges of different interaction types. We investigate next the electrostatics of extended charges in dielectric media, modeling the electrostatic potential distribution for charged wires, stripes and domain walls, with either homogeneous or periodic linear charge density. Basing on the calculated dependencies of the potential on the system geometry and material parameters, we discuss several possible applications: i ) we suggest the non-destructive method for measuring the dielectric constant of substrate deposited thin films by a two-wire capacitor; ii ) we study the domain structure formation in ferroelectric films with in-plane polarization. We show that for the in-plane striped 180˚ domain structure, induced by the discontinuity of the order parameter at the film edge, the equilibrium domain width violates the Kittel's square root law, being instead inversely proportional to the film thickness. The calculations for the in-plane domains, generated by the microscope tip or charged domain wall in the ferroelectric slab, demonstrate the conformity of the optimal domain length to the characteristic electrostatic length of the sample, and accord with the experimental data

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How do people manage disagreements in conversation? Previous studies of dialogue have shown that the interactional consequences of disagreement are not straightforward. Although often interpreted as face-threatening when performed in an unmitigated manner, disagreement can also encourage novel contributions. This thesis explores how systematically altering the presentation of someone's stance influences the deliberative potential of a dialogue. A corpus analysis of ordinary conversations shows that exposed disagreement occurs rarely, but that speakers can signal a potentially adversarial position in a variety of other ways. One of the most interesting among these is the way people mark their rights to speak about something. Resources such as reported speech and prefacing incongruent content with discourse markers (e.g. 'well') can be important to the management of interpersonal factors. The idea that disagreement is problematic but also useful for deliberation is examined. Using a method that allows fine-grained manipulations of text based dialogues in real-time, agreement and disagreement fragments are inserted into a discussion dialogue. The findings show that inserting exposed disagreement violates the conventions of polite dialogue leading participants to put more effort into the production of their replies, and does not improve levels of deliberation. This raises the question of whether manipulating apparent degrees of speaker commitment might be more important for influencing the quality of deliberation. An experiment was devised which presented oppositional content with differing degrees of 'knowingness'. The findings indicate that marking stance as knowing leads to less guarded exchanges, but does not increase deliberation. Conversely, framing statements as less knowing increases the likelihood that participants consider more alternative viewpoints, thus increasing the deliberative quality of a dialogue. Potential applications include training guidelines for professionals developing tools to support considered debate. Implications for computational argumentation studies include the importance of interpersonal dynamics and stance construction for formulating polite arguments.

Les tentatives menées pour détruire des cellules cancéreuses avec les agents radiothérapeutiques à base de 211 At qui ont été synthétisés jusqu’à présent ne sont pas encore pleinement satisfaisantes car elles sont entachées par une deastatination in vivo. Étant donné que ce problème est lié aux connaissances actuelles qui sont limitées concernant la chimie de base de l’astate et de ses espèces, des recherches fondamentales combinant des expériences à l’échelle des ultra-traces et des études théoriques ont été lancées. Dans cette thèse, une étude théorique de plusieurs espèces de l’astate est réalisée au moyen de méthodes relativistes basées sur la théorie de la fonctionnelle de la densité ou des méthodes à basées sur la fonction d’onde. Tout d'abord, les méthodes qui peuvent être utilisées pour faire des prédictions pertinentes sont établies. A l’aide de ces approches, nous rationaliserons les structures électroniques, géométries et propriétés physicochimiques des différents systèmes d'intérêt théorique ou expérimental, en particulier les espèces AtF3 et AtO+. Finalement, nous identifierons formellement une nouvelle espèce de l’astate à l’aide de résultats expérimentaux et de calculs, ce qui non seulement complète le diagramme de Pourbaix de l’astate en milieu aqueux non complexant, mais aussi donne des informations cruciales pour identifier des conditions expérimentales pour rendre le plus « réactif » possible le précurseur At−, qui est de nos jours impliqué dans la synthèse d’agents radiothérapeutiques innovants. / Trials to destroy cancer cells with currently synthesized 211 At-based radiotherapeutic agents are not yet fully satisfactorily since they resume to in vivo deastatination. Since this issue is related to the limited knowledge of the basic chemistry of At and its species, fundamental researches combining ultra-trace experiments and computational studies have been initiated. In this thesis, a computational study of several At species is performed, by means of relativistic density functional theory and wave-function-based calculations. First, the quantum mechanical approaches that can safely be used to make adequate predictions are established. Using these approaches, we attempt to rationalize the electronic structures, geometries, and physico-chemical properties of various systems of theoretical and/or experimental interest, in particular the AtF3 and AtO+ ones. By the end, we firmly identify a new At species by combining outcomes of experiments and calculations. This new species not only completes the Pourbaix diagram of At in aqueous and non-complexing media, but also gives clues of identifying experimental conditions to make best reactive the At– precursor, which is currently involved in the synthesis of promising radiotherapeutic agents.

En France, il existe une transmission de la danse à l'école, qui s'effectue par le moyen d'un partenariat entre enseignants et artistes chorégraphiques. La thèse propose une observation participante de cette forme pédagogique originale qu'est l'atelier de danse organisé dans le cadre scolaire. Après avoir identifié les situations pédagogiques caractéristiques de cette forme de transmission, elle s'efforce de préciser les différents types d'enjeux - techniques, esthétiques, éthiques - inhérents à l'interaction artiste-enseignant et artiste-élèves. Les outils pédagogiques dégagés de l'expérience répétée de l'atelier, assurant la meilleure transposition possible des conditions de l'expérience chorégraphique, sont objectivés et mis en relation avec les critères de qualité revendiqués par les différents partenaires. Le travail de recherche contribue ainsi à l'analyse du processus de professionnalisation de cette forme de transmission / In France, there is a dance transmission at school which is made via a partnership between teachers and choreographic artists. The thesis suggests a participating observation of this original educational form which is the organised dance workshop in the school context. After having identified the characteristic educational situations of this transmission form, it tries to specify the different stakes - technical, aesthetic, ethical types - inherent to the interaction between artists and teachers as well as artists and children. The educational tools drawn from the repeated experience of the workshop, providing the best possible transposition of the choreographic experiential conditions, are targeted and related with quality criteria claimed by the different partners. The research work contributes in that way to the analysis of the professional process of this transmission form

Molybdenum may function as a catalyst in promoting and controlling some of the complex chemical reactions that go on in living systems. The lack of understanding which exists about these reactions is due to their obvious complexity and to the extremely minute quantities of molybdenum involved. Traces of molybdenum have been shown to have spectacular results on the growth of plants when added to certain soils. This metal is also required for the growth of azobacter, the nitrogen-fixing bacteria.

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The modulation of biological interactions with artificial surfaces is a vital aspect of biomaterials research. Protein adsorption is established as an early biological response to implanted materials that influences biocompatibility, hence an understanding of how to direct specific protein and cellular responses is critical for the development of future biomaterials. The effects of protein adsorption and subsequent cellular interactions on a variety of surfaces are investigated. Acrylic-based hydrogels are used as a model system in which to investigate both tear and serum protein adsorption from simple and complex solutions. The effect of surface topography, created by colloidal silica, on serum protein adsorption and conformation as well as cell adhesion is also investigated. Tantalum (Ta) and oxidised polystyrene (PSox) are investigated for their ability to support cell adhesion when precoated with various serum proteins. Protein interactions are examined using a combination of quartz crystal microbalance with dissipation (QCM-D), surface plasmon resonance (SPR), dual polarisation interferometry (DPI) and enzyme-linked immunosorbent assay (ELISA) while cellular interactions are analysed using QCM-D, microscopy and adhesion assays. The QCM-D technique was evaluated for its ability to provide new insight into cell-surface interactions. Most tear and serum proteins were found to adsorb onto the acrylic hydrogels, however, lysozyme was found to absorb into the hydrogel matrix and decrease the hydration, which may lead to an adverse biological response. Fibronectin adsorbed onto nanotextured colloidal silica surfaces was found to be conformationally changed compared to flat controls which is likely to correlate with the reduced endothelial cell adhesion observed on these textured surfaces. Ta and PSox precoated with either serum or fibronectin were shown to support cell adhesion and spreading, while surfaces precoated with albumin were not. QCM-D responses varied between underlying surfaces, protein precoating, ECM deposition, cytoskeletal activity and length of exposure indicating that alterations in cell-material responses are reflected in QCM-D measurements. QCM-D parameters were found to correlate with adhered cell numbers, cell contact area and cytoskeletal activity. The results highlight that characterisation of interfacial interactions with a wide range of analytical techniques is necessary to gain insight into cell-protein-material interactions which can then be utilised in the development of new generations of biomaterials with improved properties designed for specific applications.

"March 2003" Bibliography: leaves 206-233. The experimental data presented in this thesis provide evidence that PTP-Pez is an active phosphatase that interacts with and dephosphorylates the adherens junction protein ℓ-catenin. PTP-Pez also associates with proteins that form part of the tight junction complex, the scaffolding protein ZO-1 and the transmembrane protein occludin.