Higher Degree Theses
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Item Dairy Effluent Steroidal Hormones Characteristics and Treatment by Anaerobic Digestion (Covered Anaerobic Pond) and Biochar(Thesis, The University of Waikato, 2024) Rachmani, AsafEndocrine disrupting compounds such as estrogenic steroid hormones (ESHs) are problematic when present in waterways in terms of both the health of the ecosystem and downstream water treatment. Dairy farms are some of the largest contributors to ESHs in the environment. This study focused on a farm located in the Waikato region, New Zealand, which housed 550, primarily grass-fed dairy cows. The farm included a rotary milking shed, feed pad, sump, covered anaerobic pond and storage pond, with effluent and sludge being applied to land. In this study concentrations of the conjugated and unconjugated ESHs, 17α-estradiol (17α-E2), 17β-estradiol (17β-E2) and estrone (E1), in both dissolved and solid phases of dairy shed effluent, and covered anaerobic pond sludge and effluent, were measured from grab samples over a period of nine months. These were used to investigate seasonal variation and performance of the covered anaerobic pond in removing the ESHs and their conversion from one form into another. Previously published methods of ESH analysis were validated and adapted for ESH analysis in dissolved and solid phases, and a new enzymatic method for conjugate ESH analysis was tested and used. In addition, the effect of dosing the effluent with biochar was examined on ESH removal. A covered anaerobic pond model was developed to examine the efficacy of a dairy farm-based covered anaerobic pond treatment system to settle, transform, absorb and remove ESHs. The model was calibrated utilising ESH measurements and used to examine the effect of biochar addition and operational parameters on ESH removal. Overall ESH concentrations in the covered anaerobic pond influent, sludge and effluent were 4,171 ng/L, 93,601 ng/L and 4,346 ng/L respectively. ESH concentrations peaked in dairy shed effluent during April and July, which correlated with the late pregnancy and calving periods on the farm. The mean organic carbon normalised adsorption coefficient (Koc) for ESHs in the samples from the pond treatment system ranged between 3.06 mL/g to 3.78 mL/g, comparable with published values in soil and wastewater sludge. Up to 99% of the total mass of ESHs in the sludge and between 70-80 % in influent and effluent were retained in the solids phase. The predominant ESH in the influent samples was 17α-E2 (2,869 ng/L), but E1 predominated in the sludge (85,414 ng/L) and in the effluent (3,140 ng/L). The dissolved and solid phases of dairy shed effluent contained the highest relative proportions of conjugated ESHs with means of 25.1 % and 3.38 % respectively and corresponding mean concentrations of 113 ng/L and 137 ng/L. In contrast, sludge and effluent samples (dissolved and solid phases) from the covered anaerobic pond contained smaller relative proportions of conjugated ESHs, 0.90 % and 1.21 %, and 7.17 % and 0.43 % respectively and corresponding mean concentrations of 6.65 ng/L and 967 ng/L, and 52.5 ng/L and 19.7 ng/L respectively. These results demonstrate the importance of considering the solid fraction within effluent treatment systems when analysing ESHs, otherwise estrogenic load can be greatly underestimated. The conjugated ESHs were present in both the dissolved and solid phases of all samples collected, indicating that conjugated ESHs are persistent and can pass through anaerobic treatment systems contributing to estrogenic load once applied to pasture, and potentially leach into groundwater or migrate to nearby surface waters. Overall anaerobic treatment of dairy waste decreased the contribution of 17α-E2 and 17-E2 while increasing that of E1, however, 17-E2 was the main contributor to total estrogenicity. The calibration of the model developed provided a good fit with experimental data with an R2 of 0.98-0.99. Addition of biochar into dairy shed effluent and the model covered anaerobic pond system resulted in an 89 % reduction of free ESHs but had a minimal impact on conjugated ESH. Addition of biochar increased the solid phase ESH concentration by 19 % settling out into the sludge and reducing overall estrogenic load in the effluent. Operational factors such as higher influent flow rates and sludge accumulation negatively impacted the covered anaerobic pond ESH removal performance. Sludge accumulation and short-circuiting caused by infrequent removal and shallow depth of the covered anaerobic pond system resulted in mixing of fresh influent with the upper layer of pond sludge, leading to decreased removal efficiency. To enhance the covered anaerobic pond system's performance, increasing the retention time and reducing sludge carry over by increasing pond volume and depth, resulted in ESH removal increasing to 67.9 % (no biochar) and 73.0 % (with biochar), and estrogenicity reduction improving to 70.4 % (no biochar) and 73.5 % (with biochar).Item "All the Stuff" is Different: A Mixed Method Study of Continuity and Discontinuity During the Transition to School in New Zealand(Thesis, The University of Waikato, 2024) Hayes, Joanne MaraeaThis study investigated multiple perspectives on continuity and discontinuity during the transition to school in New Zealand. The transition to school has been identified as an important time in the life of a child which has the potential to impact social, emotional, and academic outcomes. Starting school involves a shift into a new environment where change must be navigated. Earlier studies have investigated the discontinuities between prior-to-school and school contexts, and it has been suggested that increasing continuity is a way to ease the transition experience. However, policies and practices change over time, therefore the continuities and discontinuities children experience when starting school may differ from those experienced in previous time periods. This research sought to explore the continuities and discontinuities children experience on transitioning into play-based new entrant classrooms in New Zealand, identify which may be significant, and investigate practices teachers use to support transitioning children. The study adopted a social constructionist framework and used a sequential, explanatory, mixed method research design. Phase one consisted of an online survey of early childhood and new entrant teachers which collected both qualitative and quantitative data. Preliminary statistical and thematic analysis of this data informed planning for the second phase of the study which involved case studies in three schools. Each case study included the perspectives of parents, children, and new entrant teachers. Parent perspectives were gathered through questionnaires and teachers’ views through interviews. Child perspectives were elicited through paired child led tours and photographs taken by children. Data from case studies were analysed thematically. Findings from both phases were used to inform the answers to the research questions and the discussion of how the research objectives were met. Findings revealed three key themes relating to the continuities and discontinuities children in this study experienced on transitioning into the play-based new entrant classrooms. These themes were: people and relationships, teaching and learning, and expectations, structure, and environment. Each of these aspects of continuity and discontinuity interacted with and influenced the others, highlighting the importance of paying attention to all three aspects when considering how best to support transitioning children. Data revealed that there were differences between the perspectives of participant groups, particularly between the views of teachers and children. This may mean that teachers are not aware of what matters most for children during this time of change and may not put in place strategies that address these aspects of continuity and discontinuity. The study also identified a range of influences on teacher practices which impacted on what happened in the classroom. These included factors in the wider school and national environment such as intake policies and expectations for showing children’s progress against standards. It was found that while teachers espoused a belief that schools should be ready for children, they held underlying beliefs about child readiness which influenced both their practice and the reasons for their practice. The study highlights the importance of new entrant teachers knowing about each child and of teachers in each sector having relationships with and knowledge of the other sector. Teachers can then understand how to prepare children for the changes they will experience when transitioning and plan induction programmes which are relevant and purposeful.Item Kant’s Universalism in Historical Context: Repoliticising the Foundations of a Seminal Political Philosophy(Thesis, The University of Waikato, 2024) Koçak, BerkayIn the contemporary global political milieu, Immanuel Kant's universalist political philosophy has assumed a prominent role, eliciting substantial discourse and scrutiny due to its enduring significance in shaping the fundamental principles that underpin the present-day international order. Kant's philosophy is celebrated for its commitment to universality and its pioneering articulation of political ideals aimed at establishing the foundational principles requisite for the construction of a peaceful, sustainable, and self-regulating global order, grounded upon universally applicable moral precepts. While an array of scholarly works has meticulously explored Kant's groundbreaking contributions and intellectual influence, a discernible gap exists in comprehending how his philosophical framework intersects with the multifaceted social and material backdrop of his era. This thesis embarks on a critical exploration of Kant's universalism, employing a novel approach grounded in the social history of political theory, firmly rooted in historical materialism. Diverging from abstract interpretations of political theory, this method seeks to historically recontextualise Kant's ideas within their original social, political, and class contexts. To illuminate Kant's universalism from this perspective, a pivotal question must be addressed: What kind of political project does Kant’s universalism propose in terms of the political polarisations between absolutism, feudalism, and liberalism in the Prussian context? This research endeavours to reevaluate Kant's universalist political philosophy by examining its connection to the protracted crisis of German feudalism, its influence on social and political thought, and its entanglement with the power struggles between absolutist-paternalists, traditional feudalists, and liberal reformists vying for control over social property relations in the Prussian Ständestaat. Within this context, Kant's philosophy also intersects with the reform project of the rising educated professional classes, known as the Bildungsbürgertum, whose growing influence shaped the trajectory of social property relations and the Enlightenment (Aufklärung) in the Prussian state-building period. A distinctive contribution of this thesis is that it highlights the unique class character of the Prussian Bildungsbürgertum, distinct from the British and French bourgeoisie traditionally analysed in Marxist perspectives. Notably, the thesis contends that this state-dependent educated professional class had a particular affinity for Kantian universalism, making it, for a time, the prevailing ideology of the Prussian Bildungsbürgertum. By adopting this historical materialist perspective of the social history of political theory, this thesis aims to shed light on the intricate relationships between Kant's universalist political thought and the historically specific conditions of 18th-century Prussia, ultimately elucidating the nuanced limitations imposed by his class context on his philosophical contributions.Item Eliciting Expert Uncertainty from Decision Making(Thesis, The University of Waikato, 2024) Falconer, Julia RuthEliciting expert uncertainty is a complex task with many caveats. Its usefulness in high-level decision-making and Bayesian inference makes it a necessary task that must be completed accurately. This thesis explores uncertainty elicitation in terms of prior elicitation for Bayesian inference and the wider knowledge elicitation field. It describes methods currently available for prior elicitation and proposes a new typology, highlighting lesser-known methods. Based on the limitations of current methods, a new method for prior elicitation is introduced. This new method allows an analyst to model expert decision-making data to elicit a probability distribution that reflects expert uncertainty. An example of parole board decision-making is used to elicit a prior distribution of a prisoner re-offending upon release from prison. This example shows analysts how to elicit distributions for tabular data; however, more complex data types, such as images and reports, are often used for decision-making. To elicit distributions capturing expert uncertainty from more complex data, this thesis introduces a deep learning approach and uses an example of eliciting cancer risk, in histopathology, to illustrate this approach for the wider knowledge elicitation field.Item Beyond time and experience: An institutional approach and categorial framework for the analysis of waiting from a philosophical materialist perspective(Thesis, The University of Waikato, 2023) Avila Castellanos, Duzan DussierThis thesis proposes a novel theoretical framework for studying waiting as a multidimensional phenomenon, advancing beyond traditional approaches that often perceive it as a singular, homogenous, and purely temporal event. It asserts that waiting embodies temporal, spatial, and operational dimensions, each with dialectical and dynamic components. Rather than viewing waiting as an ontologically negative or undefined event, it is conceptualised as a material and objective process. Its axiological nature is neutral, not essentially negative or positive, with its classification primarily contingent upon the context. The research underscores several waiting processes as a social institution, emphasising its varied forms in different institutionalised contexts, thereby diverging from approaches that overemphasise these processes' subjective and experiential dimensions. The thesis, grounded in philosophical materialism, scrutinises the historical evolution of waiting, linking it to secular and non-secular concepts of hope and others, such as expectation and time. It critiques modern perceptions of waiting, especially its temporal hypostasis, advocating for a wider, materialist approach that incorporates often overlooked spatial and operational dimensions while not undermining temporal significance. The study introduces a set of categories from a philosophical materialist perspective to analyse waiting spaces' structural and functional elements. It explores the operational dimension of waiting concerning institutional structures and suggests that this dimension encompasses both spatial and temporal aspects. Concerning the temporal analysis, the research reveals multiple objective temporalities within the waiting processes, replacing the idea of a single waiting time with the notion of possible multiple times in several kinds of waiting processes. The final chapter applies these theoretical perspectives empirically, analysing institutionalised waiting processes in the current Cuban context. It successfully inspects the spatial, operational, and temporal components of waiting, prioritising the institutional character of these processes. The thesis concludes that understanding various waiting processes depends largely on institutional nature, including the psychological and subjective behaviours displayed during waiting. This thesis introduces a new institutional perspective on waiting studies, mainly related to social sciences approaches. At the same time, we recognise the need for ongoing exploration and discourse to further our understanding of this intriguing subject. The proposed materialist approach strives to enrich the epistemological status of waiting studies and augment our collective knowledge.