The process of fish migration within rivers and streams is important, especially during the spawning season which often coincides with peak spring discharges in Manitoba. Current environmental regulations for fish passage through culverts require that the average velocity be limited to the prolonged swimming speed of the fish species present. In order to examine the validity of this approach, physical model results were used to calibrate and test a commercially available Computational Fluid Dynamics (CFD) model. Detailed analysis showed that CFD models and the empirical equations used were both able to give a better representation of the flow field than the average velocity. However, the empirical equations were able to provide a more accurate velocity distribution within the fully developed region. A relationship was then developed, to estimate the cumulative percent area less than a threshold velocity within CSP culverts, to be used as a guideline during the design phase.

Orobanche ramosa L. is an annual, parasitic weed present in the western Murray-Mallee region of South Australia. A quarantine zone was established to encompass all known infestations, and has been adjusted over time as new infestations have been discovered. The movement of fodder, machinery, grain and straw, horticultural crops, livestock, and soil is controlled by strict quarantine procedures, to prevent further spread across the landscape. O. ramosa presents a unique situation for weed managers: plants are obligate parasites, relying entirely on broadleaved hosts for their water and nutrition; and seeds are tiny (0.3 mm), produced in large numbers (up to 100 000 seeds per plant), and are long-lived, persisting in the soil seed bank for up to 13 years. The dispersal vectors for O. ramosa in South Australia are the focus of this Master’s thesis. Two dispersal vectors were chosen for investigation: sheep and wind. Sheep were examined as possible vector for seeds, both via the gut (internal transport, or endozoochory) and via adhesion on the external surface of the animal (external transport, or epizoochory). Internal transport via sheep was investigated with a classic gut-passage experiment, which showed a peak in excretion of weed seeds at day 2, reducing to zero seeds excreted at day 8, and a half-life of 2 days. Two phases of external transport on sheep was studied: attachment and retention. Attachment was confirmed by finding seeds on the body wool and feet of sheep that had been kept for 7 days on soil with an O. ramosa seedbank. Seed retention was confirmed by placing seeds onto the body and still finding them in wool samples after 7 days. Wind was the other dispersal vector investigated for O. ramosa. A survey of natural wind dispersal was conducted, which confirmed wind as a vector and allowed trap design to be tested. Then a portable field-based wind tunnel was used to investigate the effects of ground cover (bare ground and cereal stubble) and wind speed (low, medium and high) on wind dispersal of O. ramosa seeds. For the stubble treatments, more seeds were trapped within the tunnel, and on bare ground more seeds were trapped exiting the tunnel. Importantly, the data showed that low wind speeds readily move O. ramosa seeds, and that the seeds are capable of aerodynamic lift in the wind profile. Results are discussed in the context of dispersal biology, quarantine procedures, and future work that would further refine knowledge of likely dispersal vectors for O. ramosa. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1459246 / Thesis (M.Sc.) -- University of Adelaide, School of Earth and Environmental Sciences, 2009

Thesis (M.A.)--Georgia State University, 2009. / Title from title page (Digital Archive@GSU, viewed June 24, 2010) Kathryn McClymond, committee chair; Timothy Renick, Gary Laderman, committee members. Includes bibliographical references (p. 73-76).

In my thesis, I aim to show that a focus on liminality in contemporary Scottish fictional texts illustrates underlying developments of relevant social phenomena with regard to class issues, gender and sexual identity. The anthropological concept of liminality looks at a situation of “being between”. The liminar faces a situation of having to renegotiate their values and perceptions in order to proceed. Liminality always involves the existence of limits which have to be transgressed and against which the individual negotiates a personal situation. I further hypothesise that the transgression of limits can be seen as an instrument to create order. I take an anthropological approach to my thesis. Arnold van Gennep’s early studies on rites of passage and Victor Turner’s study of liminality originate in the observation of tribe-internal, social structures of personal development. Van Gennep assumes a tripartite structure among which liminality is the middle stage, the phase in which the initiand has to perform tasks to re-enter and become part of the community. Turner isolates the middle stage and transfers this concept to western societies. This theory is taken up and developed further by several literary critics and anthropologists. While the transgression of limits is often regarded as a violation of those norms which regulate societies, the transgression of limits in a rite of passage and connected with liminality is a vital aspect and socially necessary. Several concepts are related to this theory, which will play a major role in my thesis: Turner’s permanent liminality, Mikhail Bakhtin’s carnivalesque as well as Foucault’s transgression. In the first chapter, I contrast two of Alasdair Gray’s novels, stating that the most powerful message of social and capitalist criticism is not just visible on the surface of the hyperbolic texts, but particularly prominent in liminal passages. The theories of Bakhtin and Turner plays the most important role in this chapter. In the second chapter, A. L. Kennedy’s novels are contrasted. In So I am Glad a difficult psycho-social issue is solved by a liminal trigger-figure, Paradise is an example of the destructive and restrictive effects of permanent liminality. In chapter three, I deal with the issue of passing and an individual redefinition of gender identity. The performativity of masculinity reveals ambiguous definitions of gender and morale. The Wasp Factory portrays a form of masculinity which has destructive effects on the individual and its environment. It is the tension in the liminal situation of a gender myth, a brutally performed masculinity and the character’s biological sex which expresses a harsh criticism of society’s definition of masculinity. In Trumpet, the binary model of gender is questioned. The text suggests a different definition of identity as fluid, passing between the two ‘extremes’, formulating the possibility of a state of being ‘something in-between’. It is the confrontation with this ‘otherness’ which provokes a wave of rejection and protest in the environment of the individual passing as a member of the ‘other sex’. In this case, it is not the obvious liminal individual, but his son who undergoes a process of change and thus a process of renegotiating his strict value system. The final chapter deals with liminal spaces and how these reflect and support the internal development which the protagonists undergo. The choice of Orkney as a mystical place and the fictional setting in a war game show that liminal spaces – both real and fictitious – trigger a personal development and reconnect present day life in Scotland with historical events which have had a shaping role for Scottish and European life.

Le Web Sémantique est une extension du Web standardisée par le World Wide Web Consortium. Les différents standards utilisent comme format de base pour les données le Resource Description Framework (rdf) et son langage de requêtes nommé sparql. Plus généralement, le Web Sémantique tend à orienter l’évolution du Web pour permettre de trouver et de traiter l’information plus facilement. L'augmentation des volumes de données rdf disponibles tend à faire rendre standard la distribution des jeux de données. Par conséquent, des évaluateurs de requêtes sparql efficaces et distribués sont de plus en plus nécessaires. Pour faire face à ces challenges, nous avons commencé par comparer plusieurs évaluateurs sparql distribués de l'état-de-l'art tout en adaptant le jeu de métriques considéré. Ensuite, une analyse guidée par des cas typiques d'utilisation nous a conduit à définir de nouveaux champs de développement dans le domaine de l'évaluation distribuée de sparql. Sur la base de ces nouvelles perspectives, nous avons développé plusieurs évaluateurs efficaces pour ces différents cas d'utilisation que nous avons comparé expérimentalement. / The Semantic Web standardized by the World Wide Web Consortium aims at providing a common framework that allows data to be shared and analyzed across applications. Thereby, it introduced as common base for data the Resource Description Framework (rdf) and its query language sparql.Because of the increasing amounts of rdf data available, dataset distribution across clusters is poised to become a standard storage method. As a consequence, efficient and distributed sparql evaluators are needed.To tackle these needs, we first benchmark several state-of-the-art distributed sparql evaluators while adapting the considered set of metrics to a distributed context such as e.g. network traffic. Then, an analysis driven by typical use cases leads us to define new development areas in the field of distributed sparql evaluation. On the basis of these fresh perspectives, we design several efficient distributed sparql evaluators which fit into each of these use cases and whose performances are validated compared with the already benchmarked evaluators. For instance, our distributed sparql evaluator named sparqlgx offers efficient time performances while being resilient to the loss of nodes.

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This essay will discuss where the people who built the passage graves and the first farmers at the Falbygden area in Sweden came from. That the first farmers built the passage graves is today a given fact, but how did the Neolithic transition take form in Scandinavia? Two theories have been put forward over the past century, that they learned through cultural diffusion, or that the first farmers were immigrants. Recent DNA- and Strontiumanalyses have been made on skeletons from passage graves from Falbygden and on skeletons from different regions across Europe, both from Mesolithic and Neolithic people. These results show that the Mesolithic hunter-gatherers shares no or little continuity with the Neolithic farmers, even in cases where the two groups lived in close neighbouring for a long time.

Abstract Pressure screening, nowadays the most widely used method for cleaning pulp, has been traditionally investigated as a debris removal process. The aim of this thesis, however, was to study it with a view to the fractionation of pulps, examining systematically and extensively the effects of screening parameters on fractionation under actual working conditions in order to provide an insight into its possibilities and limitations as a fractionation method. The experimental work was performed with a full-scale two-stage pressure screen connected to an industrial TMP process. Fractionation of the pulp was analysed in terms of consistency, freeness, optical fibre length distribution, coarseness index and Bauer-McNett fractions. Two sampling systems were used during the screening experiments, manual and semiautomatic. The latter was assessed to be more reliable, as reflected in lower stochastic variation and the absence of a systematic bias in the mass balance errors over the screen. The poorer reliability of the manual sampling system was offset by the large number of screening tests, however. The results of the screening experiments showed that with a given design of the screen plate, the separation of each fraction was dependent almost exclusively on the mass and volumetric reject rates. The mass flow of fines, defined as the Bauer-McNett P200 fraction, was dependent mostly on the volumetric reject rate, while the mass flow of fibrous fractions (R200, R50, R30, R16) depended mostly on the mass reject rate. The mass reject rate obtained in pressure screening was a result of the choice of operating parameters, but fractionation efficiency could not be affected by using different combinations of these parameters (feed consistency, rotor tip speed and slot velocity) if the mass and volumetric reject rates were kept constant. The slot width together with the contouring of the screen plate affected the fractionation efficiency as compared with the situation at constant mass and volumetric reject rate. Increased fractionation was obtained by reducing the slot width and contouring. The pulp passage ratio, which combines the mass and volumetric reject rates into one parameter, was found to be a expedient way of expressing the fractionation of pulp, as it was possible to present fractionation uniformly as a function of this ratio. The change in freeness was found to correlate quite well with that in Bauer-McNett fractions, and it was a good indicator of fractionation efficiency in screening. Apart from fractionation according to length (or Bauer-McNett fractions), the slotted pressure screen was also found to classify the fibres according to their coarseness. The coarseness difference was partially dependent on the fibre length, but additionally the coarseness in the accept pulp for any given fibre length class was always lower than that in the reject pulp. The difference obtained seemed to depend on the passage ratio of the pulp. This thesis provides new information for the modelling of pulp quality and the design of fractionation experiments, fractionation processes and screen room control strategies.

This thesis frames the transition into motherhood as a rite of passage; proposes a new model for the rite of passage into motherhood based on the four seasons; and highlights the importance of contextual and specific ritual actions or sequences to navigate the transition. Qualitative data from semi-structured interviews with ten western women, from a middle class, Christian background, who had all become mothers through childbirth, are examined under three main headings. Firstly, the women’s experiences of their transition are explored using rites of passage theory as a lens. Although significant differences emerge, particularly from a gender perspective, important themes within the women’s experiences are highlighted, including the nature of relationships; the importance of support; journaling; and the telling of birthing stories. The influences of contemporary cultural aspects such as the medicalization of childbirth and myths about motherhood are also taken into account. Secondly, the field of ritual studies is explored in order to provide a framework in which to situate the women’s ritualizing. Existing rituals associated with motherhood are analysed and gaps are identified in existing Christian liturgical resources for this area, specifically for ritual actions or sequences marking motherhood as a rite of passage, and for the expression of birthing stories. A working definition of ritualizing is also established and the research findings are divided according to time frame, exploring the women’s ritualizing before birth, around birth and after birth. Thirdly, spirituality in relation to childbirth and the transition into motherhood is explored and its place within healthcare and theological literature examined. Nicola Slee’s theory on women’s faith development is used to draw out some of the patterns that emerge from the interviewees’ experiences, and the sacramental nature of birthing is considered. The thesis concludes with a critique of implications and associated suggestions for those within a church or healthcare context with responsibility for the pastoral and spiritual care of women during their transition into motherhood.

Nucleation is the first step in the formation of a new phase in a thermodynamic system. The Classical Nucleation Theory (CNT) is the traditional theory used to describe this phenomenon. The object of this thesis is to investigate nucleation beyond one of the most significant limitations of the CNT: the assumption that the surface tension of a nucleating cluster of the new phase is independent of the cluster’s size and has the same value that it would have in the bulk of the new phase. In order to accomplish this, we consider a microscopic, two-dimensional Lattice Gas Automata (LGA) model of precipitate nucleation in a supersaturated system, with model input parameters Ess (solid particle-to-solid particle bonding energy), Esw (solid particle-to-water particle bonding energy), η (next-to-nearest neighbour bonding coeffiicent in solid phase), and Cin (initial solute concentration). The LGA method was chosen for its advantages of easy implementation, low memory requirements, and fast computation speed. Analytical results for the system’s concentration and the crystal radius as functions of time are derived and the former is fit to the simulation data in order to determine the system’s equilibrium concentration. A mean first-passage time (MFPT) technique is used to obtain the nucleation rate and critical nucleus size from the simulation data. The nucleation rate and supersaturation are evaluated using a modification to the CNT that incorporates a two-dimensional, radius-dependent surface tension term. The Tolman parameter, δ, which controls the radius-dependence of the surface tension, decreases (increases) as a function of the magnitude of Ess (Esw), at fixed values of η and Esw (Ess). On the other hand, δ increases as η increases while Ess and Esw are held constant. The constant surface tension term of the CNT, Σ0, increases (decreases) with increasing magnitudes of Ess (Esw) fixed values of Esw (Ess), and increases as η is increased. Together, these results indicate an increase in the radius-dependent surface tension, Σ, with respect to increasing magnitude of Ess relative to the magnitude of Esw. Σ0 increases linearly as a function of the change in energy during an attachment or detachment reaction, |ΔE|, however with a slope less than that predicted for a crystal that is uniformly packed at maximum density.