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This thesis offers a fresh appraisal of the wise adviser in Pindar's epinician poetry. By focusing on the prominent figure of Chiron, it shows how Pindar engages with the paraenetic tradition in a way that reveals the distinctive character of the epinician poet. The first part of the study explores the function of Chiron as an interactive model for Pindar as poet-teacher. Chapter 1 examines how the mythical pedagogue enhances the status of the poet as wise adviser by illuminating the moral character of his advice. It shows how the relationship between teacher and pupil in the myth provides a model for that of poet and addressee and enables the poet to present his advice indirectly. In two separate case studies, I explore how Chiron's paradigmatic associations interact with the poet as adviser. In Chapter 2 (Nemean 3), I argue that the poet dramatises the instruction of a pupil as part of a collaborative and interactive form of learning. In Chapter 3 (Pythian 3), I argue that Pindar reconfigures preceptual instruction in a 'dialogue' between two speakers who enact the pedagogic relationship of Chiron and Asclepius. This strategy allows the poet to present his teaching tactfully and authoritatively. I conclude that Chiron is a figure for the poet as tactful and authoritative adviser and contributes to the poet's creation of a 'paraenetic encomium'. Secondly, this study of the reception and remodelling of the paraenetic tradition in Pindar illuminates the distinctive character of his advice and its central importance in Pindar's construction of poetic and moral authority.

A new 3D model of light scattering applicable to dielectric faceted objects is presented. The model combines Geometric Optics with diffraction on individual facets yet maintains the low computational expense of standard Geometric Optics. The current implementation of the model is explained and then applied to the problem of light scattering by ice crystals in cirrus clouds. Accurate modelling of the scattering properties of such crystals is crucial to better understanding of cirrus radiative properties and hence to climate modelling and weather forecasting. Calculations using the new model are compared to a separation of variables method and the Improved Geometric Optics method with encouraging results. The model shows significant improvements over standard Geometric Optics. The size applicability of the new model is discussed. The model is applied to a range of crystal geometries that have been observed in cirrus including the hexagonal column, the hollow column, the droxtal and the bullet rosette. For each geometry the phase function and degree of linear polarization are presented and discussed. Ice analogue crystals grown at the University of Hertfordshire have optical properties very close to ice but are stable at room temperature. The geometries of three ice analogue crystals are reconstructed and the single scattering properties of the reconstructions are presented. 2D scattering patterns calculated using the model are compared to laboratory photographs of scattering patterns on a screen created by an ice analogue hexagonal column. The agreement is shown to be very good. By applying the model to a range of geometries, it is shown that the results in the form of 2D scattering patterns can potentially be used to aid particle characterization. By combining the model with a Monte Carlo radiative transfer code, comparisons are made with aircraft radiance measurements of cirrus provided by the Met Office. The improvements over standard Geometric Optics are found to persist following a radiative transfer treatment.

The thesis begins with a consideration of what multitasking might mean, and derives a definition to be used in the rest of the thesis. The goals of the thesis are laid out - to develop a model, in the context of Cognitive Ergonomics, which has the properties of generality and utility. A consideration of this context along with the nature of models leads to the proposal of a heuristic strategy for developing a model with the desired properties. A prototype model is proposed based on a consideration of literature drawn from Psychology, Computing, AI and Operations Research. The developmental strategy is then implemented through three successive iterations. Each iteration is observation of the multitasking behaviour associated with a real job, using concurrent verbal protocol techniques. The choice of jobs can be understood in terms of the development strategy. All the jobs observed possess certain key attributes, but crucially differ in their other attributes. The jobs observed are cooking, computer operations and railway signal control. The final model represents multitasking as the allocation of resources to tasks over time. In this model, the person has two roles - as a controller and also as an effector. In the latter case, the person is modelled as a pair of resources. The plausibility of the recruitment of the knowledge in the model for the purposes of design is then evaluated experimentally, providing a partial measure of the success of the developmental strategy. The thesis ends with a summary and assessment of the model and of the strategy, together with a review of some additional areas of literature relevant to its final state.