Learning a trade in New Zealand : On and off the job learning in engineering trades
- Authors: Cannan, James
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: The engineering trades selected for this study were specifically in the automotive and refrigeration/air-conditioning/electrical disciplines, as they are typical of the engineering discipline trade groups studying at institutes of technology and workplaces as apprentices. This research focused on two trade occupations within the engineering industry and investigated differences between pre-apprentice and apprentice experiences in skills and knowledge acquisition and assessment whilst learning on and off the job; that is, studying vocational education at institutes of technology and engaging in practical activities at the workplace. New Zealand has faced dramatic changes in tertiary education over the past 20 years, particularly in the vocational education and training (VET) sector. As a result of these changes there has been a substantial increase in participation in education and training. There is now a far wider range of courses to cater for the needs of learners in the vocational sector as the New Zealand population grows, along with the engineering trade opportunities that are currently available in the workplace. A qualitative research approach was used including interviews, focus groups and questionnaires. The project consisted of case studies based around cohorts of apprentices and pre-apprentices. Lecturers and employers were also included. The findings of the study will inform discussions on the ways in which learning prior to and in the workplace might be more effectively facilitated and managed in the future. It also raises questions about the effectiveness and quality of current training and assessment of engineering trade programs of study within New Zealand, as well as issues in apprenticeships and attrition within specific trades.
- Description: Doctor of Philosophy
- Authors: Cannan, James
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: The engineering trades selected for this study were specifically in the automotive and refrigeration/air-conditioning/electrical disciplines, as they are typical of the engineering discipline trade groups studying at institutes of technology and workplaces as apprentices. This research focused on two trade occupations within the engineering industry and investigated differences between pre-apprentice and apprentice experiences in skills and knowledge acquisition and assessment whilst learning on and off the job; that is, studying vocational education at institutes of technology and engaging in practical activities at the workplace. New Zealand has faced dramatic changes in tertiary education over the past 20 years, particularly in the vocational education and training (VET) sector. As a result of these changes there has been a substantial increase in participation in education and training. There is now a far wider range of courses to cater for the needs of learners in the vocational sector as the New Zealand population grows, along with the engineering trade opportunities that are currently available in the workplace. A qualitative research approach was used including interviews, focus groups and questionnaires. The project consisted of case studies based around cohorts of apprentices and pre-apprentices. Lecturers and employers were also included. The findings of the study will inform discussions on the ways in which learning prior to and in the workplace might be more effectively facilitated and managed in the future. It also raises questions about the effectiveness and quality of current training and assessment of engineering trade programs of study within New Zealand, as well as issues in apprenticeships and attrition within specific trades.
- Description: Doctor of Philosophy
- Authors: Carino, James
- Date: 2023
- Type: Text , Thesis , PhD
- Full Text: false
- Description: This thesis concerns individuals who develop dementia symptoms before 65 years of age (called younger-onset dementia, or YOD) while employed, which has significant personal, financial and social effects due to the commitments and responsibilities of families and work. This thesis aims to identify employment-related work strategies to allow people with dementia to continue to work. Four linked studies consistent with the study aim were designed and implemented. In Chapter 3, Study 1, a review of employer approaches to employees with dementia, evaluated nine studies related to dementia and work. The main analysis extracted, grouped and classified employer actions towards employees with dementia in these studies. Two in three employer responses to employees with dementia were ineffective in supporting employees. Poor understanding of the difficulties of those living with dementia appeared to be the main cause. Better knowledge among individuals experiencing dementia symptoms and their employers is needed. In Chapter 4, Study 2, a review of guidance materials related to dementia in the workplace sought to identify and review the availability, structure and content of information to support employees or employers dealing with dementia. Guidance information published by dementia organisations in English-speaking countries such as Australia, Canada, New Zealand, Singapore, the United Kingdom (England, Scotland and Ireland) and the United States of America was analysed and compiled. Dementia websites were found to offer relevant, high-quality content, but this can be fragmented and difficult to find. Few organisations covered the range of relevant content. Most information was aimed at employees with dementia symptoms rather than their employers. Information gaps for employees with dementia included the importance of early diagnosis and assistive technology applications. Employer information gaps included workplace identification of dementia, employee retention and managing the wider work team around the person with dementia. Chapter 5 addressed Study 3, employer approaches to employees with dementia at work. This chapter extended existing research exploring the experience of dementia at work. Four groups were engaged in semi-structured interviews: (1) employers and human resource (HR) managers; (2) professionals supporting employers such as HR consultants; (3) employees with dementia who were working or had left work within the past two years; and (4) professionals supporting people living with dementia. The study identified employee and employer actions and assessed how dementia could be managed using relevant information and approaches to maintain viable employment. As well as the need for greater awareness of workplace cognitive impairment, this study identified solutions to prolong employment. Suggestions included using relevant expertise and external peer support, implementing self-management and personal strategies, raising employer awareness of employee rights and employer responsibilities, employee engagement in decisions about them and their work and assistance with the transition from work. An analytical approach, considering the person, task and organisation may assist in devising more effective employer implementation approaches. Study 4, guidance model document feedback (presented in Chapter 6), evaluated two model guidance documents (one for employers, the other for employees) developed from Studies 1, 2 and 3. This study aimed to determine the relevance and completeness of the content and identify potential enhancements. Study 3 participants were recontacted for this study. The proposed documents were received positively. Suggested improvements included care in the use of terms such as ‘dementia’, moving beyond ‘dementia friendly’ to inclusivity and clearer specification of the responsibilities of HR practitioners and employers. Chapter 7 placed the findings across the four studies into the context of increased workplace and societal attention to mental health, wellbeing, cognitive fitness and neurodiversity. Growing awareness of these issues is argued to be positive for future workplace understanding, acceptance and management of conditions such as dementia and cognitive impairment. HR leadership and expertise in dealing with dementia in the workplace are pertinent to achieving this goal. This thesis elaborates on the practical importance of information and communication in understanding cognitive impairment at work. Awareness that individuals in the early stages of cognitive difficulties maintain the capacity to continue to work can be improved. A review of information designed to support workplace decision-making has identified content and pathways to improve workplace knowledge and awareness. In conclusion, dementia at work can be managed by integrating awareness of dementia with mental health and cognition in workplaces. Greater attention to the diversity of cognitive abilities and processes in organisations can improve the life experience of employees living with dementia, their contribution to work, overall work performance and satisfaction.
- Description: Doctor of Philosophy
The construct validity of the Attention-Deficit/Hyperactivity Disorder and Oppositional Defiant Disorder symptoms : A multitrait-multisource approach based on father and mother ratings
- Authors: Carroll, Steve
- Date: 2005
- Type: Text , Thesis , PhD
- Full Text:
- Description: There has been considerable debate over the construct validity of the Attention-Deficit / Hyperactivity Disorder (AD/HD) and Oppositional Defiant Disorder (ODD) symptoms in past research due to measurement error (e.g., source effects) associated with parent and teacher ratings of childhood behaviour. Recent multitrait-multisource (MT-MS) studies have attempted to account for measurement error by using multiple sources involving parents and teachers. These studies have identified low trait variance in the AD/HD and ODD dimensions, thereby raising questions about the validity of the AD/HD - inattention (IN), AD/HD - hyperactivity/impulsivity (H/I), and ODD constructs. However, as these studies examine ratings from different settings (i.e., home and school) it can be argued that the low trait variance in the AD/HD constructs may reflect cross-situational differences. The current research used confirmatory factor analysis (CFA) procedures to examine the internal and external validity of AD/HD and ODD symptoms based on ratings (i.e., mother and father) from individuals in the same setting...
- Description: Doctor of Psychology (Clinical)
- Authors: Carroll, Steve
- Date: 2005
- Type: Text , Thesis , PhD
- Full Text:
- Description: There has been considerable debate over the construct validity of the Attention-Deficit / Hyperactivity Disorder (AD/HD) and Oppositional Defiant Disorder (ODD) symptoms in past research due to measurement error (e.g., source effects) associated with parent and teacher ratings of childhood behaviour. Recent multitrait-multisource (MT-MS) studies have attempted to account for measurement error by using multiple sources involving parents and teachers. These studies have identified low trait variance in the AD/HD and ODD dimensions, thereby raising questions about the validity of the AD/HD - inattention (IN), AD/HD - hyperactivity/impulsivity (H/I), and ODD constructs. However, as these studies examine ratings from different settings (i.e., home and school) it can be argued that the low trait variance in the AD/HD constructs may reflect cross-situational differences. The current research used confirmatory factor analysis (CFA) procedures to examine the internal and external validity of AD/HD and ODD symptoms based on ratings (i.e., mother and father) from individuals in the same setting...
- Description: Doctor of Psychology (Clinical)
Bitcoin : users’ characteristics, motivations and investment behaviours
- Authors: Carter, Corey
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: In less than a decade, the cryptocurrency known as Bitcoin has gone from a fringe phenomenon to a topic of increasing interest to academia and mainstream investors. However, despite the growing body of research seeking to understand Bitcoin, the pseudonymous, decentralised, and globally-diffused nature of its user base means that the individuals who use it remain poorly understood. In particular, the motivations, risk-appreciation, and investment behaviours of early adopters and innovators are subject to supposition in the absence of data derived from the user base. This thesis seeks to address this gap in knowledge by employing a multi-stage, mixed methodology approach and a theoretical framework to understand the Bitcoin user base. Utilising semantic analysis, a survey of online cryptocurrency communities, and econometric time-series analysis, this thesis addresses the extent and nature of Bitcoin in hedging; how individual users perceive their own motivations, uses, and risks that have driven their behaviour; and the nature of the relationship between the prices of cryptocurrency and indices of confidence. Analysis of the data determined that the use of Bitcoin as an instrument of hedging is limited, and influenced by political and institutional factors. Likewise, its motivations, uses, and risks are reflective of the users’ political ideology, with the community and marketplace becoming more sophisticated as they evolve over time. Additionally, despite several case studies demonstrating risk-averse adoption of Bitcoin, there is no relationship between its prices and confidence.
- Description: Doctor of Philosophy
- Authors: Carter, Corey
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: In less than a decade, the cryptocurrency known as Bitcoin has gone from a fringe phenomenon to a topic of increasing interest to academia and mainstream investors. However, despite the growing body of research seeking to understand Bitcoin, the pseudonymous, decentralised, and globally-diffused nature of its user base means that the individuals who use it remain poorly understood. In particular, the motivations, risk-appreciation, and investment behaviours of early adopters and innovators are subject to supposition in the absence of data derived from the user base. This thesis seeks to address this gap in knowledge by employing a multi-stage, mixed methodology approach and a theoretical framework to understand the Bitcoin user base. Utilising semantic analysis, a survey of online cryptocurrency communities, and econometric time-series analysis, this thesis addresses the extent and nature of Bitcoin in hedging; how individual users perceive their own motivations, uses, and risks that have driven their behaviour; and the nature of the relationship between the prices of cryptocurrency and indices of confidence. Analysis of the data determined that the use of Bitcoin as an instrument of hedging is limited, and influenced by political and institutional factors. Likewise, its motivations, uses, and risks are reflective of the users’ political ideology, with the community and marketplace becoming more sophisticated as they evolve over time. Additionally, despite several case studies demonstrating risk-averse adoption of Bitcoin, there is no relationship between its prices and confidence.
- Description: Doctor of Philosophy
From gold field to municipality : The establishment of Ballarat West 1855-1857
- Authors: Cartledge, Graeme
- Date: 2018
- Type: Text , Thesis , Masters
- Full Text:
- Description: This thesis examines the establishment of the Ballarat West Municipality in the years of 1855 – 1857 and the factors that contributed to the introduction of local self-government in the immediate aftermath of the Eureka Stockade. Underlying the study is the changing administrative requirements necessitated by the transition from a temporary gold field to a permanent city. A central theme explored in relation to this development is that it was a consequence of the emerging culture of modernity of that era precipitating radical political changes in local government that began with the 1835 British Municipal Corporations Act. This theme is expanded to highlight the reform of local government in the Victorian era in response to urbanization and the need for modern and rationalised methods of managing the new towns and growing cities. The difficulty in making and sustaining such progressive changes in Britain is contrasted with the eager adoption of the concept of progress and the new Victorian Municipal Corporations Act of 1854 on the Ballarat goldfields. The question as to why the Municipality was established is answered by exploring the connection between the failure of the Goldfields Commission at the end of 1854 and the belief held by many, that taxes should be accompanied with political representation and should be spent where they were collected. This study exposes the remarkable story of how the first elected councillors, starting from scratch, quickly established administrative systems and brought order to a community emerging out of turmoil. The process of how the municipality was established is uncovered by an extensive survey of the council minutes, the media, council correspondence and public records.
- Description: Masters by Research
- Authors: Cartledge, Graeme
- Date: 2018
- Type: Text , Thesis , Masters
- Full Text:
- Description: This thesis examines the establishment of the Ballarat West Municipality in the years of 1855 – 1857 and the factors that contributed to the introduction of local self-government in the immediate aftermath of the Eureka Stockade. Underlying the study is the changing administrative requirements necessitated by the transition from a temporary gold field to a permanent city. A central theme explored in relation to this development is that it was a consequence of the emerging culture of modernity of that era precipitating radical political changes in local government that began with the 1835 British Municipal Corporations Act. This theme is expanded to highlight the reform of local government in the Victorian era in response to urbanization and the need for modern and rationalised methods of managing the new towns and growing cities. The difficulty in making and sustaining such progressive changes in Britain is contrasted with the eager adoption of the concept of progress and the new Victorian Municipal Corporations Act of 1854 on the Ballarat goldfields. The question as to why the Municipality was established is answered by exploring the connection between the failure of the Goldfields Commission at the end of 1854 and the belief held by many, that taxes should be accompanied with political representation and should be spent where they were collected. This study exposes the remarkable story of how the first elected councillors, starting from scratch, quickly established administrative systems and brought order to a community emerging out of turmoil. The process of how the municipality was established is uncovered by an extensive survey of the council minutes, the media, council correspondence and public records.
- Description: Masters by Research
Ecology and management of a tropical invasive weed, Cyperus aromaticus (Navua sedge) in Queensland, Australia
- Authors: Chadha, Aakansha
- Date: 2022
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cyperus aromaticus (Ridley) Mattf. & Kükenth, commonly known as Navua sedge is an invasive C4 perennial sedge species of the Cyperaceae family found predominantly in tropical environments. A native of tropical Africa, it has spread widely and become problematic in many southwest Pacific islands and in tropical north Queensland, Australia. It is a principal weed infesting pastures, sugarcane, banana and root crops, which causes significant damage across a range of industries including dairy, beef, sugarcane and banana in the highly fertile and productive areas of Queensland. The primary objective of this thesis was to contribute to a significant weed management problem at a stage where intervention is cost effective, efficient and environmentally sensitive. At the centre of this work, was a contribution to fundamental knowledge regarding the ecology of the species. The first objective was to examine the global literature on rhizomatous weeds and C. aromaticus in particular to identify the research problems and knowledge gaps. As C. aromaticus has dual mode of reproduction, via seeds and rhizomes, both these aspects were taken into consideration in the experimental chapters. The project critically addressed the issues related to (i) understanding the fundamental ecological aspects of reproduction via seeds in C. aromaticus, (ii) the regeneration of C. aromaticus from its rhizomes, and (iii) control of C. aromaticus using herbicides. A stepwise approach, involving multiple objectives was used to meet the primary objective of this project. Three experiments were conducted to understand the fundamental ecological aspects of reproduction via seeds. (i) A study was conducted to understand the soil seed bank dynamics of pastures invaded by C. aromaticus. It was found that C. aromaticus is the dominant species in the soil seed bank of pastures invaded by C. aromaticus and can contribute between 62% and 95% of the total seed bank. In this respect, the abundance of C. aromaticus seed in the soil seed bank is positively correlated with the aboveground biomass of C. aromaticus and 83% of the total C. aromaticus seeds was found in the top 0-5 cm layer of soil. (ii) The lifespan of C. aromaticus seeds was estimated by artificial ageing technique in the laboratory whereby the results indicate that long-term management is required to control the recruitment from the soil seed bank even in the absence of additional seed deposition. (iii) Seed germination ecology was investigated to understand the effect of various environmental factors on the germination of C. aromaticus seeds. It was found that light is absolutely required for C. aromaticus seed germination, and there was no germination of seeds above 150 mM NaCl concentration and -0.8 Mpa osmotic potential, or from seeds buried greater than 2 cm below the soil surface. Focussing on the regeneration from C. aromaticus rhizomes, an experiment was conducted to investigate the effect of rhizome size and burial depth on the emergence from rhizomes in different soil types. A positive correlation was found between the total emergence of tillers and rhizome fragment size of C. aromaticus, but a negative correlation was found between the total emergence of tillers and burial depth of rhizomes. Importantly, it was also found that rhizomes when reduced to 10 cm or smaller fragments and buried 15 cm or deeper will prevent emergence. A further two glasshouse experiments were conducted to explore chemical options to control both the aboveground biomass and the belowground rhizomes. (i) The herbicide sensitivity of various rates of halosulfuron-methyl was evaluated at different growth stages using plants with and without established rhizomes. Mortality of 27.5%, 0% and 5% was recorded when treated with 75 g ai ha-1 of halosulfuron-methyl at the mowed, pre-flowering and flowering stages, respectively in plants with established rhizomes. The herbicide was effective in controlling the aboveground growth, however, subsequent emergence of new growth from the rhizome confirms the failure of the herbicide to kill the rhizome. In contrast, application of 75 g ai ha-1 of halosulfuron-methyl provided 100% mortality in plants treated at seedling and pre-flowering stage in plants without established rhizomes. (ii) Another herbicide with an alternate mode of action, florpyrauxifen-benzyl, was assessed at different growth stages again using plants with and without established rhizomes. Results indicate that a single application of florpyrauxifen-benzyl is effective at controlling C. aromaticus seedlings, but not effective at controlling plants with established rhizomes. In summary, this thesis has increased the fundamental knowledge about the ecology of C. aromaticus which will feed into designing of management strategies. Likewise, new tools established in the form of mechanical and chemical control and improving the methods currently used to manage populations will advance the capacity to effectively manage C. aromaticus in the future. Although this investigation is based on a relatively focussed suite of issues relevant to tropical north Queensland, where there is an immediate application of the research outcomes from this study, it is anticipated that they will also inform weed management strategies more broadly in a range of similar environments throughout the world.
- Description: Doctor of Philosophy
- Authors: Chadha, Aakansha
- Date: 2022
- Type: Text , Thesis , PhD
- Full Text:
- Description: Cyperus aromaticus (Ridley) Mattf. & Kükenth, commonly known as Navua sedge is an invasive C4 perennial sedge species of the Cyperaceae family found predominantly in tropical environments. A native of tropical Africa, it has spread widely and become problematic in many southwest Pacific islands and in tropical north Queensland, Australia. It is a principal weed infesting pastures, sugarcane, banana and root crops, which causes significant damage across a range of industries including dairy, beef, sugarcane and banana in the highly fertile and productive areas of Queensland. The primary objective of this thesis was to contribute to a significant weed management problem at a stage where intervention is cost effective, efficient and environmentally sensitive. At the centre of this work, was a contribution to fundamental knowledge regarding the ecology of the species. The first objective was to examine the global literature on rhizomatous weeds and C. aromaticus in particular to identify the research problems and knowledge gaps. As C. aromaticus has dual mode of reproduction, via seeds and rhizomes, both these aspects were taken into consideration in the experimental chapters. The project critically addressed the issues related to (i) understanding the fundamental ecological aspects of reproduction via seeds in C. aromaticus, (ii) the regeneration of C. aromaticus from its rhizomes, and (iii) control of C. aromaticus using herbicides. A stepwise approach, involving multiple objectives was used to meet the primary objective of this project. Three experiments were conducted to understand the fundamental ecological aspects of reproduction via seeds. (i) A study was conducted to understand the soil seed bank dynamics of pastures invaded by C. aromaticus. It was found that C. aromaticus is the dominant species in the soil seed bank of pastures invaded by C. aromaticus and can contribute between 62% and 95% of the total seed bank. In this respect, the abundance of C. aromaticus seed in the soil seed bank is positively correlated with the aboveground biomass of C. aromaticus and 83% of the total C. aromaticus seeds was found in the top 0-5 cm layer of soil. (ii) The lifespan of C. aromaticus seeds was estimated by artificial ageing technique in the laboratory whereby the results indicate that long-term management is required to control the recruitment from the soil seed bank even in the absence of additional seed deposition. (iii) Seed germination ecology was investigated to understand the effect of various environmental factors on the germination of C. aromaticus seeds. It was found that light is absolutely required for C. aromaticus seed germination, and there was no germination of seeds above 150 mM NaCl concentration and -0.8 Mpa osmotic potential, or from seeds buried greater than 2 cm below the soil surface. Focussing on the regeneration from C. aromaticus rhizomes, an experiment was conducted to investigate the effect of rhizome size and burial depth on the emergence from rhizomes in different soil types. A positive correlation was found between the total emergence of tillers and rhizome fragment size of C. aromaticus, but a negative correlation was found between the total emergence of tillers and burial depth of rhizomes. Importantly, it was also found that rhizomes when reduced to 10 cm or smaller fragments and buried 15 cm or deeper will prevent emergence. A further two glasshouse experiments were conducted to explore chemical options to control both the aboveground biomass and the belowground rhizomes. (i) The herbicide sensitivity of various rates of halosulfuron-methyl was evaluated at different growth stages using plants with and without established rhizomes. Mortality of 27.5%, 0% and 5% was recorded when treated with 75 g ai ha-1 of halosulfuron-methyl at the mowed, pre-flowering and flowering stages, respectively in plants with established rhizomes. The herbicide was effective in controlling the aboveground growth, however, subsequent emergence of new growth from the rhizome confirms the failure of the herbicide to kill the rhizome. In contrast, application of 75 g ai ha-1 of halosulfuron-methyl provided 100% mortality in plants treated at seedling and pre-flowering stage in plants without established rhizomes. (ii) Another herbicide with an alternate mode of action, florpyrauxifen-benzyl, was assessed at different growth stages again using plants with and without established rhizomes. Results indicate that a single application of florpyrauxifen-benzyl is effective at controlling C. aromaticus seedlings, but not effective at controlling plants with established rhizomes. In summary, this thesis has increased the fundamental knowledge about the ecology of C. aromaticus which will feed into designing of management strategies. Likewise, new tools established in the form of mechanical and chemical control and improving the methods currently used to manage populations will advance the capacity to effectively manage C. aromaticus in the future. Although this investigation is based on a relatively focussed suite of issues relevant to tropical north Queensland, where there is an immediate application of the research outcomes from this study, it is anticipated that they will also inform weed management strategies more broadly in a range of similar environments throughout the world.
- Description: Doctor of Philosophy
An investigation into the professional competencies required by Australian HRM practitioners
- Authors: Chambers, Stephen
- Date: 2006
- Type: Text , Thesis
- Full Text: false
- Description: "The role of human resource management (HRM), or simply human resource (HR), practitioners has changed dramatically, especially in the last 10 years. As a result of this change in role, as detailed in the literature review, HRM practitioners require appropriate competencies to maintain effectiveness and enhance the value of their contribution to their organisation..." --p. 1.
- Description: Master of Business
Contemporary applications of Fresco : The narrative of the artist
- Authors: Chappell, Annette
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: Fresco is a vehicle for powerful and enduring forms of cultural storytelling; it references universal narrative themes. The research objective of this project is to achieve a contemporary application of fresco through exploration and transgression of traditional material, pictorial forms and functions. In this transgression, the artist locates a personal narrative, through the immersive methods of autoethnographic inquiry and from the epistemological position of material thinking and production. The contemporary application of fresco is arrived at by interrogating the traditional methods, materials and intentions of fresco as recorded in fifteenth-century Europe and with reference to what other contemporary practitioners in this field have achieved. Materials knowledge and methods gained through on-site material conservation of lime plaster fresco is an impetus to this project and has engendered a focus on re-purposing and re-imagining the media in contemporary and personal expressions. The narrative of the artist is arrived at through materials thinking in fresco methodology, and through an interpretive autoethnographic analysis of a personal archive or studio text consisting of visual and textual material. The studio text is regarded as a unique ethnographic artefact of personal significance. The new term of ‘studio text’ for practice-led research is proposed to differentiate practice-led language and forms from the sociological or positivist terminology of ‘fieldwork notes’ or ‘data’. Autoethnographic methodology is disrupted to incorporate the indwelling practices of material thinking and immersive writing (ekphrasis) and drawing (enstasis). Through the integration of these methodologies, interpretations of the studio text are enacted concurrently with material production. Materials and motifs are selected for personal significance and resonance, and constructed as part or full frescoes. The material outcomes of this integration of methodologies are described as Visual Diaries and publicly exhibited. The documentation of integrated methodology in this project may contribute to emergent thinking in practice-led research.
- Description: Doctor of Philosophy
- Authors: Chappell, Annette
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: Fresco is a vehicle for powerful and enduring forms of cultural storytelling; it references universal narrative themes. The research objective of this project is to achieve a contemporary application of fresco through exploration and transgression of traditional material, pictorial forms and functions. In this transgression, the artist locates a personal narrative, through the immersive methods of autoethnographic inquiry and from the epistemological position of material thinking and production. The contemporary application of fresco is arrived at by interrogating the traditional methods, materials and intentions of fresco as recorded in fifteenth-century Europe and with reference to what other contemporary practitioners in this field have achieved. Materials knowledge and methods gained through on-site material conservation of lime plaster fresco is an impetus to this project and has engendered a focus on re-purposing and re-imagining the media in contemporary and personal expressions. The narrative of the artist is arrived at through materials thinking in fresco methodology, and through an interpretive autoethnographic analysis of a personal archive or studio text consisting of visual and textual material. The studio text is regarded as a unique ethnographic artefact of personal significance. The new term of ‘studio text’ for practice-led research is proposed to differentiate practice-led language and forms from the sociological or positivist terminology of ‘fieldwork notes’ or ‘data’. Autoethnographic methodology is disrupted to incorporate the indwelling practices of material thinking and immersive writing (ekphrasis) and drawing (enstasis). Through the integration of these methodologies, interpretations of the studio text are enacted concurrently with material production. Materials and motifs are selected for personal significance and resonance, and constructed as part or full frescoes. The material outcomes of this integration of methodologies are described as Visual Diaries and publicly exhibited. The documentation of integrated methodology in this project may contribute to emergent thinking in practice-led research.
- Description: Doctor of Philosophy
Canonical Duality Theory for Global Optimization problems and applications
- Chen, Yi
- Authors: Chen, Yi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The canonical duality theory is studied, through a discussion on a general global optimization problem and applications on fundamentally important problems. This general problem is a formulation of the minimization problem with inequality constraints, where the objective function and constraints are any convex or nonconvex functions satisfying certain decomposition conditions. It covers convex problems, mixed integer programming problems and many other nonlinear programming problems. The three main parts of the canonical duality theory are canonical dual transformation, complementary-dual principle and triality theory. The complementary-dual principle is further developed, which conventionally states that each critical point of the canonical dual problem is corresponding to a KKT point of the primal problem with their sharing the same function value. The new result emphasizes that there exists a one-to-one correspondence between KKT points of the dual problem and of the primal problem and each pair of the corresponding KKT points share the same function value, which implies that there is truly no duality gap between the canonical dual problem and the primal problem. The triality theory reveals insightful information about global and local solutions. It is shown that as long as the global optimality condition holds true, the primal problem is equivalent to a convex problem in the dual space, which can be solved efficiently by existing convex methods; even if the condition does not hold, the convex problem still provides a lower bound that is at least as good as that by the Lagrangian relaxation method. It is also shown that through examining the canonical dual problem, the hidden convexity of the primal problem is easily observable. The canonical duality theory is then applied to dealing with three fundamentally important problems. The first one is the spherically constrained quadratic problem, also referred to as the trust region subproblem. The canonical dual problem is onedimensional and it is proved that the primal problem, no matter with convex or nonconvex objective function, is equivalent to a convex problem in the dual space. Moreover, conditions are found which comprise the boundary that separates instances into “hard case” and “easy case”. A canonical primal-dual algorithm is developed, which is able to efficiently solve the problem, including the “hard case”, and can be used as a unified method for similar problems. The second one is the binary quadratic problem, a fundamental problem in discrete optimization. The discussion is focused on lower bounds and analytically solvable cases, which are obtained by analyzing the canonical dual problem with perturbation techniques. The third one is a general nonconvex problem with log-sum-exp functions and quartic polynomials. It arises widely in engineering science and it can be used to approximate nonsmooth optimization problems. The work shows that problems can still be efficiently solved, via the canonical duality approach, even if they are nonconvex and nonsmooth.
- Description: Doctor of Philosophy
- Authors: Chen, Yi
- Date: 2015
- Type: Text , Thesis , PhD
- Full Text:
- Description: The canonical duality theory is studied, through a discussion on a general global optimization problem and applications on fundamentally important problems. This general problem is a formulation of the minimization problem with inequality constraints, where the objective function and constraints are any convex or nonconvex functions satisfying certain decomposition conditions. It covers convex problems, mixed integer programming problems and many other nonlinear programming problems. The three main parts of the canonical duality theory are canonical dual transformation, complementary-dual principle and triality theory. The complementary-dual principle is further developed, which conventionally states that each critical point of the canonical dual problem is corresponding to a KKT point of the primal problem with their sharing the same function value. The new result emphasizes that there exists a one-to-one correspondence between KKT points of the dual problem and of the primal problem and each pair of the corresponding KKT points share the same function value, which implies that there is truly no duality gap between the canonical dual problem and the primal problem. The triality theory reveals insightful information about global and local solutions. It is shown that as long as the global optimality condition holds true, the primal problem is equivalent to a convex problem in the dual space, which can be solved efficiently by existing convex methods; even if the condition does not hold, the convex problem still provides a lower bound that is at least as good as that by the Lagrangian relaxation method. It is also shown that through examining the canonical dual problem, the hidden convexity of the primal problem is easily observable. The canonical duality theory is then applied to dealing with three fundamentally important problems. The first one is the spherically constrained quadratic problem, also referred to as the trust region subproblem. The canonical dual problem is onedimensional and it is proved that the primal problem, no matter with convex or nonconvex objective function, is equivalent to a convex problem in the dual space. Moreover, conditions are found which comprise the boundary that separates instances into “hard case” and “easy case”. A canonical primal-dual algorithm is developed, which is able to efficiently solve the problem, including the “hard case”, and can be used as a unified method for similar problems. The second one is the binary quadratic problem, a fundamental problem in discrete optimization. The discussion is focused on lower bounds and analytically solvable cases, which are obtained by analyzing the canonical dual problem with perturbation techniques. The third one is a general nonconvex problem with log-sum-exp functions and quartic polynomials. It arises widely in engineering science and it can be used to approximate nonsmooth optimization problems. The work shows that problems can still be efficiently solved, via the canonical duality approach, even if they are nonconvex and nonsmooth.
- Description: Doctor of Philosophy
The effects of playing Nintendo Wii on depression, sense of belonging, social support, and mood among Australian aged care residents : A pilot study
- Authors: Chesler, Jessica
- Date: 2015
- Type: Text , Thesis , Masters
- Full Text:
- Description: Adults aged 65 years or older constitute the fastest growing age group worldwide, leading to greater numbers of people requiring care in residential facilities. Adults in these facilities have higher levels of depression, lower levels of social support, and lower levels of sense of belonging compared with older adults living in the community. Research has begun to assess the effectiveness of interventions aimed at improving the mental health of aged care residents. Within this population, cognitive and physical benefits of playing video games have been documented in the literature, as well as greater social interaction, and decreased loneliness. The aim of the current study was to investigate the effectiveness of playing Wii bowling twice weekly, with up to 3 other residents, for 6 weeks. An Australian sample of 31 women and 8 men between the ages of 65 and 95 years (Mean age = 85.68, SD = 9.62) were randomised to either a treatment or control group based on their place of residence. The residents completed demographic information, The Veterans Affairs Saint Louis University Mental Status Exam, the Geriatric Depression Scale Short Form, the Social Provisions Scale, and three visual analogue scales to measure sense of belonging and mood. These scales were completed pre-intervention (0 weeks), postintervention (6 weeks), and at 2-month follow up (14 weeks). Qualitative data on social interaction between group members was also collected at weeks 1, 3, and 6. Results did not support the use of the Wii to improve residents’ self-reported levels of depression, social support, sense of belonging, or mood. Social interaction increased over the 6 weeks, as measured by interaction analyses and also residents’ comments. Overall, findings indicate that Wii bowling may be a useful intervention as part of a comprehensive care program to increase social interaction within aged care. Pervasive environmental problems associated with aged care, as well as participant characteristics, may have reduced the effectiveness of the intervention program.
- Description: Master of Applied Science by Research (Psychology)
- Authors: Chesler, Jessica
- Date: 2015
- Type: Text , Thesis , Masters
- Full Text:
- Description: Adults aged 65 years or older constitute the fastest growing age group worldwide, leading to greater numbers of people requiring care in residential facilities. Adults in these facilities have higher levels of depression, lower levels of social support, and lower levels of sense of belonging compared with older adults living in the community. Research has begun to assess the effectiveness of interventions aimed at improving the mental health of aged care residents. Within this population, cognitive and physical benefits of playing video games have been documented in the literature, as well as greater social interaction, and decreased loneliness. The aim of the current study was to investigate the effectiveness of playing Wii bowling twice weekly, with up to 3 other residents, for 6 weeks. An Australian sample of 31 women and 8 men between the ages of 65 and 95 years (Mean age = 85.68, SD = 9.62) were randomised to either a treatment or control group based on their place of residence. The residents completed demographic information, The Veterans Affairs Saint Louis University Mental Status Exam, the Geriatric Depression Scale Short Form, the Social Provisions Scale, and three visual analogue scales to measure sense of belonging and mood. These scales were completed pre-intervention (0 weeks), postintervention (6 weeks), and at 2-month follow up (14 weeks). Qualitative data on social interaction between group members was also collected at weeks 1, 3, and 6. Results did not support the use of the Wii to improve residents’ self-reported levels of depression, social support, sense of belonging, or mood. Social interaction increased over the 6 weeks, as measured by interaction analyses and also residents’ comments. Overall, findings indicate that Wii bowling may be a useful intervention as part of a comprehensive care program to increase social interaction within aged care. Pervasive environmental problems associated with aged care, as well as participant characteristics, may have reduced the effectiveness of the intervention program.
- Description: Master of Applied Science by Research (Psychology)
The acute effects of aerobic exercise on Leukocyte Telomere biology
- Authors: Chilton, Warrick
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Doctor of Philosophy
- Description: Habitual exercise is unequivocally associated with decreased all-cause mortality and morbidity. Despite the strength of the association, a large part of the decreased risk is physiologically unaccounted for. Accumulating evidence indicates that leukocyte telomere length (LTL) may be one such explanatory mechanism. Telomeres are specialized deoxyribonucleic acid (DNA) sequences located at chromosomal ends where they protect the genomic DNA from enzymatic degradation. Excessive and/or premature telomere shortening in leukocytes is associated with a host of chronic diseases and impaired immune function. Observational associations exist between LTL and habitual physical activity/exercise in multiple cohorts. However, correlation does not imply causal story and the underpinning mechanisms behind the association are unclear. The current consensus is that long-term exercise-induced reductions in oxidative stress and inflammation mediate the association. The acute dynamics of telomere biology are poorly understood; however, a growing body of evidence suggests that telomeres may be amenable to acute modulation via expression of telomereassociated genes and microRNAs. Accordingly, the overarching aim of this thesis was to characterize the acute effects of aerobic exercise on leukocyte telomere biology.
- Authors: Chilton, Warrick
- Date: 2018
- Type: Text , Thesis , PhD
- Full Text:
- Description: Doctor of Philosophy
- Description: Habitual exercise is unequivocally associated with decreased all-cause mortality and morbidity. Despite the strength of the association, a large part of the decreased risk is physiologically unaccounted for. Accumulating evidence indicates that leukocyte telomere length (LTL) may be one such explanatory mechanism. Telomeres are specialized deoxyribonucleic acid (DNA) sequences located at chromosomal ends where they protect the genomic DNA from enzymatic degradation. Excessive and/or premature telomere shortening in leukocytes is associated with a host of chronic diseases and impaired immune function. Observational associations exist between LTL and habitual physical activity/exercise in multiple cohorts. However, correlation does not imply causal story and the underpinning mechanisms behind the association are unclear. The current consensus is that long-term exercise-induced reductions in oxidative stress and inflammation mediate the association. The acute dynamics of telomere biology are poorly understood; however, a growing body of evidence suggests that telomeres may be amenable to acute modulation via expression of telomereassociated genes and microRNAs. Accordingly, the overarching aim of this thesis was to characterize the acute effects of aerobic exercise on leukocyte telomere biology.
The warrior woman in contemporary romance fiction
- Authors: Chivers, Marian
- Date: 2014
- Type: Text , Thesis , Masters
- Full Text:
- Description: Master of Arts by Research
- Description: The warrior woman is a recurring figure in myth and history. She could be seen as an ambiguous character as she challenges patriarchal assumptions about gender roles with her capability for masculine aggression while being recognisably female and “feminine”. In the new millennium, she has reappeared as the action heroine in films, televisions, comics and video games and she has also infiltrated romance fiction, a genre often considered one of the most conservative genres in terms of gender roles and equality. The Silhouette Bombshell line was created by the multinational publisher Harlequin to capitalise on the popularity of “action heroines” in popular culture. The romance genre, perhaps the most derided of all scorned literature, is often accused, particularly by feminist critics, of reinforcing the patriarchal structure of society. This thesis examines how this character type in romance fiction can provide a means to question and even subvert traditional or patriarchal gender expectations. It will undertake the close examination of the first six books of the Athena Force series, which were published in 2004-2005 as part of the Silhouette Bombshell line. Both the warrior woman and the romance genre are defined and historically reviewed, together with an outline of the workings of the contemporary romance industry with regard to category, genre and publishing guidelines. There follows a detailed analysis of the warrior woman character as she appears in the Athena Force series with regard to agency, violence, sisterhood, professional career, performance of femininity and romantic relationships. This study of the warrior woman in romance fiction challenges many critical and social preconceptions about the romance genre in general, and its treatment of gender roles in particular
- Authors: Chivers, Marian
- Date: 2014
- Type: Text , Thesis , Masters
- Full Text:
- Description: Master of Arts by Research
- Description: The warrior woman is a recurring figure in myth and history. She could be seen as an ambiguous character as she challenges patriarchal assumptions about gender roles with her capability for masculine aggression while being recognisably female and “feminine”. In the new millennium, she has reappeared as the action heroine in films, televisions, comics and video games and she has also infiltrated romance fiction, a genre often considered one of the most conservative genres in terms of gender roles and equality. The Silhouette Bombshell line was created by the multinational publisher Harlequin to capitalise on the popularity of “action heroines” in popular culture. The romance genre, perhaps the most derided of all scorned literature, is often accused, particularly by feminist critics, of reinforcing the patriarchal structure of society. This thesis examines how this character type in romance fiction can provide a means to question and even subvert traditional or patriarchal gender expectations. It will undertake the close examination of the first six books of the Athena Force series, which were published in 2004-2005 as part of the Silhouette Bombshell line. Both the warrior woman and the romance genre are defined and historically reviewed, together with an outline of the workings of the contemporary romance industry with regard to category, genre and publishing guidelines. There follows a detailed analysis of the warrior woman character as she appears in the Athena Force series with regard to agency, violence, sisterhood, professional career, performance of femininity and romantic relationships. This study of the warrior woman in romance fiction challenges many critical and social preconceptions about the romance genre in general, and its treatment of gender roles in particular
Enhancing service quality and reliability in intelligent traffic system
- Authors: Chowdhury, Abdullahi
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Intelligent Traffic Systems (ITS) can manage on-road traffic efficiently based on real-time traffic conditions, reduce delay at the intersections, and maintain the safety of the road users. However, emergency vehicles still struggle to meet their targeted response time, and an ITS is vulnerable to various types of attacks, including cyberattacks. To address these issues, in this dissertation, we introduce three techniques that enhance the service quality and reliability of an ITS. First, an innovative Emergency Vehicle Priority System (EVPS) is presented to assist an Emergency Vehicle (EV) in attending the incident place faster. Our proposed EVPS determines the proper priority codes of EV based on the type of incidents. After priority code generation, EVPS selects the number of traffic signals needed to be turned green considering the impact on other vehicles gathered in the relevant adjacent cells. Second, for improving reliability, an Intrusion Detection System for traffic signals is proposed for the first time, which leverages traffic and signal characteristics such as the flow rate, vehicle speed, and signal phase time. Shannon’s entropy is used to calculate the uncertainty associated with the likelihood of particular evidence and Dempster-Shafer (DS) decision theory is used to fuse the evidential information. Finally, to improve the reliability of a future ITS, we introduce a model that assesses the trust level of four major On-Board Units (OBU) of a self-driving car along with Global Positioning System (GPS) data and safety messages. Both subjective logic (DS theory) and CertainLogic are used to develop the theoretical underpinning for estimating the trust value of a self-driving car by fusing the trust value of four OBU components, GPS data and safety messages. For evaluation and validation purposes, a popular and widely used traffic simulation package, namely Simulation of Urban Mobility (SUMO), is used to develop the simulation platform using a real map of Melbourne CBD. The relevant historical real data taken from the VicRoads website were used to inject the traffic flow and density in the simulation model. We evaluated the performance of our proposed techniques considering different traffic and signal characteristics such as occupancy rate, flow rate, phase time, and vehicle speed under many realistic scenarios. The simulation result shows the potential efficacy of our proposed techniques for all selected scenarios.
- Description: Doctor of Philosophy
- Authors: Chowdhury, Abdullahi
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Intelligent Traffic Systems (ITS) can manage on-road traffic efficiently based on real-time traffic conditions, reduce delay at the intersections, and maintain the safety of the road users. However, emergency vehicles still struggle to meet their targeted response time, and an ITS is vulnerable to various types of attacks, including cyberattacks. To address these issues, in this dissertation, we introduce three techniques that enhance the service quality and reliability of an ITS. First, an innovative Emergency Vehicle Priority System (EVPS) is presented to assist an Emergency Vehicle (EV) in attending the incident place faster. Our proposed EVPS determines the proper priority codes of EV based on the type of incidents. After priority code generation, EVPS selects the number of traffic signals needed to be turned green considering the impact on other vehicles gathered in the relevant adjacent cells. Second, for improving reliability, an Intrusion Detection System for traffic signals is proposed for the first time, which leverages traffic and signal characteristics such as the flow rate, vehicle speed, and signal phase time. Shannon’s entropy is used to calculate the uncertainty associated with the likelihood of particular evidence and Dempster-Shafer (DS) decision theory is used to fuse the evidential information. Finally, to improve the reliability of a future ITS, we introduce a model that assesses the trust level of four major On-Board Units (OBU) of a self-driving car along with Global Positioning System (GPS) data and safety messages. Both subjective logic (DS theory) and CertainLogic are used to develop the theoretical underpinning for estimating the trust value of a self-driving car by fusing the trust value of four OBU components, GPS data and safety messages. For evaluation and validation purposes, a popular and widely used traffic simulation package, namely Simulation of Urban Mobility (SUMO), is used to develop the simulation platform using a real map of Melbourne CBD. The relevant historical real data taken from the VicRoads website were used to inject the traffic flow and density in the simulation model. We evaluated the performance of our proposed techniques considering different traffic and signal characteristics such as occupancy rate, flow rate, phase time, and vehicle speed under many realistic scenarios. The simulation result shows the potential efficacy of our proposed techniques for all selected scenarios.
- Description: Doctor of Philosophy
Effects of brown coal fly ash on 30% monoethanolamine CO₂ capture systems
- Authors: Chowdhury, Mohammad
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Accumulation of fly ash during post-combustion capture (PCC) of CO2 is an emerging concern. This work assesses concerns that soluble ash components (e.g. Na, Ca, Mg) increase conductivity of amine systems increasing corrosion rates, and decreasing CO2 capture e ciency; slightly soluble metals ions (e.g. Fe) may catalyse amine oxidation; and insoluble ash components cause erosion and blockages in the PCC plants as well as providing catalytic surfaces. Loy Yang brown-coal y ashes (using XRD, SEM, EDS and ICP-MS) are rst characterised and separated into soluble, insoluble and char fractions. The e ect of each fraction on MEA oxidation (measured by UV-vis and organic acid formation) and corrosion is determined using lab-scale experiments in static and stirred pressurised reactors at simulated PCC stripper conditions. Fly ash was three times more soluble in severely oxidising conditions compared to mild 30% MEA extractions. Vantho te represents 10-20% of the y ash and was the main source of sodium, calcium and magnesium ions while Szmolnockite was a source of iron. Iron solubility was dependent on conditions, with 5% soluble in aqueous MEA and 10% in simulated desorber conditions. The soluble fraction was the only ash fraction to signi cantly promote MEA oxidation. Aged pall rings from a PCC pilot plant had severe grain boundary corrosion and chromiumoxide depletion. Grain boundary corrosion was less severe in pall rings under severely oxidising conditions. The e ects of soluble ash were unclear while organic acids promoted pitting. Fly ash is an important source of soluble sodium, calcium and iron into 30% MEA. The insoluble fraction had minimal impact on MEA oxidation and corrosion, suggesting that it was inert. Soluble ash fractions increased corrosion severity and promoted MEA oxidation. This work shows that deep y ash removal prior to PCC is particularly important for ashes with high solubility in the CO2 absorption system.
- Description: Doctor of Philosophy
- Authors: Chowdhury, Mohammad
- Date: 2019
- Type: Text , Thesis , PhD
- Full Text:
- Description: Accumulation of fly ash during post-combustion capture (PCC) of CO2 is an emerging concern. This work assesses concerns that soluble ash components (e.g. Na, Ca, Mg) increase conductivity of amine systems increasing corrosion rates, and decreasing CO2 capture e ciency; slightly soluble metals ions (e.g. Fe) may catalyse amine oxidation; and insoluble ash components cause erosion and blockages in the PCC plants as well as providing catalytic surfaces. Loy Yang brown-coal y ashes (using XRD, SEM, EDS and ICP-MS) are rst characterised and separated into soluble, insoluble and char fractions. The e ect of each fraction on MEA oxidation (measured by UV-vis and organic acid formation) and corrosion is determined using lab-scale experiments in static and stirred pressurised reactors at simulated PCC stripper conditions. Fly ash was three times more soluble in severely oxidising conditions compared to mild 30% MEA extractions. Vantho te represents 10-20% of the y ash and was the main source of sodium, calcium and magnesium ions while Szmolnockite was a source of iron. Iron solubility was dependent on conditions, with 5% soluble in aqueous MEA and 10% in simulated desorber conditions. The soluble fraction was the only ash fraction to signi cantly promote MEA oxidation. Aged pall rings from a PCC pilot plant had severe grain boundary corrosion and chromiumoxide depletion. Grain boundary corrosion was less severe in pall rings under severely oxidising conditions. The e ects of soluble ash were unclear while organic acids promoted pitting. Fly ash is an important source of soluble sodium, calcium and iron into 30% MEA. The insoluble fraction had minimal impact on MEA oxidation and corrosion, suggesting that it was inert. Soluble ash fractions increased corrosion severity and promoted MEA oxidation. This work shows that deep y ash removal prior to PCC is particularly important for ashes with high solubility in the CO2 absorption system.
- Description: Doctor of Philosophy
Challenges faced by early-career researchers in the sciences in Australia and the consequent effect of those challenges on their careers : a mixed methods project
- Authors: Christian, Katherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The purpose of the study was to explore the challenges faced by early-career researchers (ECRs) in the sciences in Australia and the consequent effect of those challenges on their careers. Using a realist/postpositivist paradigm, an evaluative approach, and a framework of job satisfaction, this project has explored and compared the views of ECRs to evaluate the factors which shape the ECR experience and contribute to job satisfaction or dissatisfaction and intention to leave, and to define the features which are necessary to keep an ECR in research. Data collection for this mixed methods study entailed a national survey of researchers working in universities and research institutes (n=658), a focus group discussion and semistructured in-depth interviews with eight women from a variety of scientific disciplines who had recently left academic research workplaces. I focussed particularly on the difficulties consequent to job insecurity: the constant need to attracting funding and a permanent position, lack of work-life balance and associated stress; and evidence of workplace difficulties such as bullying, harassment or inequity and support – or lack of it – offered by the research institutions. I examined the factors which contribute to and barriers which prevent job satisfaction of this population, and the consequent intention (if any) for ECRs to leave research or change their career path. I found an interesting situation whereby the satisfaction derived from a “love of science” was counterbalanced by stress and poor working conditions which are a consequence of lack of job security, typified by poor supervision, bullying or harassment, inequitable hiring practices, a concerning rate of impact from “questionable research practices” (impacting 34%-41% of respondents) and evidence of very high (80%) intention of ECRs to leave their position. The most significant predictor of intention to leave is time as a postdoctoral scientist: eventually the job insecurity and its associated stresses become too much and the ECRs leave their chosen career for work elsewhere. This decision, too, provides interesting findings as many of the ECRs have difficulty planning what to do next. They feel ill-prepared for an alternate career and suffer from a sense of failure as a result of having to leave academia. While addressing the shortage of funding is outside the scope of this study, in addition to offering my findings I put forward a range of recommendations which could lead to ar change of culture and benefit the wellbeing of ECRs in STEMM without incurring significant cost. The Australian Government, higher education institutions and the research community need to improve job security and workplace conditions and take better care of our people in STEMM disciplines or we will not have the scientists we need to deliver the “innovative Australia” planned for 2030 (Department of Industry Innovation and Science, 2018)
- Description: Doctor of Philosophy
- Authors: Christian, Katherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: The purpose of the study was to explore the challenges faced by early-career researchers (ECRs) in the sciences in Australia and the consequent effect of those challenges on their careers. Using a realist/postpositivist paradigm, an evaluative approach, and a framework of job satisfaction, this project has explored and compared the views of ECRs to evaluate the factors which shape the ECR experience and contribute to job satisfaction or dissatisfaction and intention to leave, and to define the features which are necessary to keep an ECR in research. Data collection for this mixed methods study entailed a national survey of researchers working in universities and research institutes (n=658), a focus group discussion and semistructured in-depth interviews with eight women from a variety of scientific disciplines who had recently left academic research workplaces. I focussed particularly on the difficulties consequent to job insecurity: the constant need to attracting funding and a permanent position, lack of work-life balance and associated stress; and evidence of workplace difficulties such as bullying, harassment or inequity and support – or lack of it – offered by the research institutions. I examined the factors which contribute to and barriers which prevent job satisfaction of this population, and the consequent intention (if any) for ECRs to leave research or change their career path. I found an interesting situation whereby the satisfaction derived from a “love of science” was counterbalanced by stress and poor working conditions which are a consequence of lack of job security, typified by poor supervision, bullying or harassment, inequitable hiring practices, a concerning rate of impact from “questionable research practices” (impacting 34%-41% of respondents) and evidence of very high (80%) intention of ECRs to leave their position. The most significant predictor of intention to leave is time as a postdoctoral scientist: eventually the job insecurity and its associated stresses become too much and the ECRs leave their chosen career for work elsewhere. This decision, too, provides interesting findings as many of the ECRs have difficulty planning what to do next. They feel ill-prepared for an alternate career and suffer from a sense of failure as a result of having to leave academia. While addressing the shortage of funding is outside the scope of this study, in addition to offering my findings I put forward a range of recommendations which could lead to ar change of culture and benefit the wellbeing of ECRs in STEMM without incurring significant cost. The Australian Government, higher education institutions and the research community need to improve job security and workplace conditions and take better care of our people in STEMM disciplines or we will not have the scientists we need to deliver the “innovative Australia” planned for 2030 (Department of Industry Innovation and Science, 2018)
- Description: Doctor of Philosophy
Patients’ experiences of acute deterioration and Medical Emergency Team (MET) encounter : a grounded theory study
- Authors: Chung, Catherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Globally, considerable effort has been made to ensure hospital patients whose clinical condition deteriorates receive timely and appropriate care. Research suggests that hospitals have increasing numbers of patients who are more likely to become seriously ill during their admission due to complex problems. Recently, patient experience has been recognised as a means of assessing healthcare delivery with healthcare services across the world gathering patient experience or satisfaction data. Acute deterioration is unique and complex for all involved. However, little is known about this experience from the patient’s perspective. The purpose of this study was to generate theory about processes patients engage in when experiencing acute deterioration and MET encounter. Also, the research aimed to recognise and explain the factors that mediate patients’ experiences. The findings of this study contribute to a growing body of knowledge that will improve patient care and practice guidelines for healthcare professionals. Underpinned by the theoretical framework of symbolic interactionism, grounded theory was employed for this study. From it ontological, epistemological, and methodological underpinnings, constructivist grounded theory was considered the most suitable approach. Using purposive sampling, in-depth semi-structured interviews were conducted with 27 patients across three Australian healthcare services. Data were collected over a 12-month period, between May 2018 – May 2019 and analysed using constant comparative analysis. The theoretical model ‘Unravelling a complex experience: contextualising patients’ experiences of acute clinical deterioration and Medical Emergency Team (MET) encounter’ emerged, offering a possible explanation of patients’ actions and processes. Most patients began their journeys feeling something was wrong which triggered emotional changes (experiencing changes-before the encounter). Patient experience was influenced by a combination of physical and psychological changes and a MET response (perceiving the reality - the encounter). After the MET encounter, some patients searched for deeper understandings about their illnesses and the events that occurred, whereas others managed without further reflection (reflecting on the event-after the encounter). Contextual conditions emerged influencing patients’ experiences with three broad mediating factors identified. Some participants identified that their acute deterioration and subsequent MET encounter was unexpected, and they perceived the nature of their illness (before their acute deterioration) as stable, based on what they had been told by medical staff (expectations and illness perception). Many participants acknowledged that their experience was dependent on the health care professionals who were caring for them at the time (relationship with the MET). Past experiences of illness and hospitalisation played an important role in participants’ abilities to conceptualise their experiences of acute deterioration and MET encounter (past experiences). These factors exerted a significant influence on participants’ experiences and helps to explain the differences between them. Unravelling a complex experience: Conceptualising patients’ experiences of acute deterioration and MET encounter offers a possible explanation of patients’ meanings, actions and processes when experiencing acute deterioration and MET encounter. The theory leads to recommendations that healthcare organisations gather data about patients’ experiences of acute deterioration and MET encounters, as these provide insights and opportunity to identify challenges that can be addressed.. Findings provide an explanatory framework for similar phenomena and increase awareness of patients’ experiences to ultimately inform health policy and improve patient care. The findings highlight the need for healthcare services to instigate strategies that support patients who have experienced acute deterioration. Further research could evaluate the effectiveness of implemented strategies.
- Description: Doctor of Philosophy
- Authors: Chung, Catherine
- Date: 2021
- Type: Text , Thesis , PhD
- Full Text:
- Description: Globally, considerable effort has been made to ensure hospital patients whose clinical condition deteriorates receive timely and appropriate care. Research suggests that hospitals have increasing numbers of patients who are more likely to become seriously ill during their admission due to complex problems. Recently, patient experience has been recognised as a means of assessing healthcare delivery with healthcare services across the world gathering patient experience or satisfaction data. Acute deterioration is unique and complex for all involved. However, little is known about this experience from the patient’s perspective. The purpose of this study was to generate theory about processes patients engage in when experiencing acute deterioration and MET encounter. Also, the research aimed to recognise and explain the factors that mediate patients’ experiences. The findings of this study contribute to a growing body of knowledge that will improve patient care and practice guidelines for healthcare professionals. Underpinned by the theoretical framework of symbolic interactionism, grounded theory was employed for this study. From it ontological, epistemological, and methodological underpinnings, constructivist grounded theory was considered the most suitable approach. Using purposive sampling, in-depth semi-structured interviews were conducted with 27 patients across three Australian healthcare services. Data were collected over a 12-month period, between May 2018 – May 2019 and analysed using constant comparative analysis. The theoretical model ‘Unravelling a complex experience: contextualising patients’ experiences of acute clinical deterioration and Medical Emergency Team (MET) encounter’ emerged, offering a possible explanation of patients’ actions and processes. Most patients began their journeys feeling something was wrong which triggered emotional changes (experiencing changes-before the encounter). Patient experience was influenced by a combination of physical and psychological changes and a MET response (perceiving the reality - the encounter). After the MET encounter, some patients searched for deeper understandings about their illnesses and the events that occurred, whereas others managed without further reflection (reflecting on the event-after the encounter). Contextual conditions emerged influencing patients’ experiences with three broad mediating factors identified. Some participants identified that their acute deterioration and subsequent MET encounter was unexpected, and they perceived the nature of their illness (before their acute deterioration) as stable, based on what they had been told by medical staff (expectations and illness perception). Many participants acknowledged that their experience was dependent on the health care professionals who were caring for them at the time (relationship with the MET). Past experiences of illness and hospitalisation played an important role in participants’ abilities to conceptualise their experiences of acute deterioration and MET encounter (past experiences). These factors exerted a significant influence on participants’ experiences and helps to explain the differences between them. Unravelling a complex experience: Conceptualising patients’ experiences of acute deterioration and MET encounter offers a possible explanation of patients’ meanings, actions and processes when experiencing acute deterioration and MET encounter. The theory leads to recommendations that healthcare organisations gather data about patients’ experiences of acute deterioration and MET encounters, as these provide insights and opportunity to identify challenges that can be addressed.. Findings provide an explanatory framework for similar phenomena and increase awareness of patients’ experiences to ultimately inform health policy and improve patient care. The findings highlight the need for healthcare services to instigate strategies that support patients who have experienced acute deterioration. Further research could evaluate the effectiveness of implemented strategies.
- Description: Doctor of Philosophy
"So what I do is bang in the search term and see how I go" The information-seeking approaches of Arts Academy students
- Authors: Claridge, Cheryl
- Date: 2015
- Type: Text , Thesis , Masters
- Full Text:
- Description: In this qualitative research project I investigated the use of library systems by a cohort of students from the University of Ballarat Arts Academy. The purpose of the study was to build a clearer picture of how these students use the library resources for their information-seeking, with a view to improving the provision of library services, resources and training. In particular I aimed to identify whether this cohort had a common approach to information-seeking. In this study I thematically analysed the data from eight think-aloud protocols and semi- structured interviews. Participants were Arts Academy students studying Performing Arts, Visual Arts or a Visual Arts/Education dual-degree who were searching for information to complete an assessment task. With the exception of two second year dual-degree students all participants were first year students. The steps taken by participants in information-seeking were identified and the successes and difficulties they experienced with the library’s systems highlighted. The participants in this cohort did not share one specific ‘information-seeking style’ however I identified some common factors across this group of students. All of the participants engaged in a staged process to source the information they required, although in some cases this process was non-linear. They did not however utilise the full capabilities of the search tools they used or access potentially useful tools and resources which the library provides. A number of participants were reticent about using eResources as they had been instructed not to use internet resources for assessment tasks. As a result of this inquiry I have made recommendations relating to the provision of library training and services, collection maintenance and library record standards. Collaboration between library and academic staff would be required to implement these recommendations to ensure optimum outcomes. Areas highlighted for future research include similar studies with student cohorts from different disciplines and an examination of students’ approaches to choosing a topic or focus for assessment tasks.
- Description: Master of Education (Research)
- Authors: Claridge, Cheryl
- Date: 2015
- Type: Text , Thesis , Masters
- Full Text:
- Description: In this qualitative research project I investigated the use of library systems by a cohort of students from the University of Ballarat Arts Academy. The purpose of the study was to build a clearer picture of how these students use the library resources for their information-seeking, with a view to improving the provision of library services, resources and training. In particular I aimed to identify whether this cohort had a common approach to information-seeking. In this study I thematically analysed the data from eight think-aloud protocols and semi- structured interviews. Participants were Arts Academy students studying Performing Arts, Visual Arts or a Visual Arts/Education dual-degree who were searching for information to complete an assessment task. With the exception of two second year dual-degree students all participants were first year students. The steps taken by participants in information-seeking were identified and the successes and difficulties they experienced with the library’s systems highlighted. The participants in this cohort did not share one specific ‘information-seeking style’ however I identified some common factors across this group of students. All of the participants engaged in a staged process to source the information they required, although in some cases this process was non-linear. They did not however utilise the full capabilities of the search tools they used or access potentially useful tools and resources which the library provides. A number of participants were reticent about using eResources as they had been instructed not to use internet resources for assessment tasks. As a result of this inquiry I have made recommendations relating to the provision of library training and services, collection maintenance and library record standards. Collaboration between library and academic staff would be required to implement these recommendations to ensure optimum outcomes. Areas highlighted for future research include similar studies with student cohorts from different disciplines and an examination of students’ approaches to choosing a topic or focus for assessment tasks.
- Description: Master of Education (Research)
The physiology of road cycling : New testing and training methodologies for competitive cyclists
- Authors: Clark, Bradley
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Objective: The objective of this project is to describe and test the efficacy of new testing and training techniques for competitive cyclists. Methods: Physiological variables and cycling performance were measured during a graded exercise test (GXT) and a novel, computer-simulated, variable gradient 20-km cycling time-trial. Initially, data collected from the time-trial and GXT were used to establish the reliability of the time-trial, determine the laboratory correlates of hilly cycling performance and examine the pacing pattern during hilly cycling performance. Then, results from a series of GXT’s and time-trials were used to establish the effects of a brief period of overload training on the physiology and performance of competitive cyclists. Results: Power output and performance time measured during a computer simulated 20-km variable gradient cycling test were reliable, however reliability diminished with increasing time between trials. Performance in variable gradient time-trial correlated strongly with absolute measures of physiological variables; however the strength of correlations increased when variables were measured relative to body mass. Power output was highest during the first four and last two kilometres of a variable gradient time-trial. Additionally, there were large differences in power output between consecutive one kilometre segments throughout the trial, particularly when the difference in gradient between segments was greater. Performance in the variable gradient time-trial improved substantially following a brief period of overload training. Performance improvement corresponded with adaptation in important physiological determinants of cycling performance, namely maximal oxygen uptake, lactate threshold and gross efficiency. Conclusions: Variable gradient, cycling time-trial tests can be used to detect meaningful changes in performance, evoke dynamic distribution of power output and are best suited to cyclists who produce high power outputs relative to body mass. The current project also determined that a brief period of overload training induces physiological adaptation and substantial improvement in cycling performance in competitive cyclists. Sport scientists, coaches and cyclists can use this information to determine the testing and training techniques used in preparation for competition.
- Description: Doctor of Philosophy
- Authors: Clark, Bradley
- Date: 2014
- Type: Text , Thesis , PhD
- Full Text:
- Description: Objective: The objective of this project is to describe and test the efficacy of new testing and training techniques for competitive cyclists. Methods: Physiological variables and cycling performance were measured during a graded exercise test (GXT) and a novel, computer-simulated, variable gradient 20-km cycling time-trial. Initially, data collected from the time-trial and GXT were used to establish the reliability of the time-trial, determine the laboratory correlates of hilly cycling performance and examine the pacing pattern during hilly cycling performance. Then, results from a series of GXT’s and time-trials were used to establish the effects of a brief period of overload training on the physiology and performance of competitive cyclists. Results: Power output and performance time measured during a computer simulated 20-km variable gradient cycling test were reliable, however reliability diminished with increasing time between trials. Performance in variable gradient time-trial correlated strongly with absolute measures of physiological variables; however the strength of correlations increased when variables were measured relative to body mass. Power output was highest during the first four and last two kilometres of a variable gradient time-trial. Additionally, there were large differences in power output between consecutive one kilometre segments throughout the trial, particularly when the difference in gradient between segments was greater. Performance in the variable gradient time-trial improved substantially following a brief period of overload training. Performance improvement corresponded with adaptation in important physiological determinants of cycling performance, namely maximal oxygen uptake, lactate threshold and gross efficiency. Conclusions: Variable gradient, cycling time-trial tests can be used to detect meaningful changes in performance, evoke dynamic distribution of power output and are best suited to cyclists who produce high power outputs relative to body mass. The current project also determined that a brief period of overload training induces physiological adaptation and substantial improvement in cycling performance in competitive cyclists. Sport scientists, coaches and cyclists can use this information to determine the testing and training techniques used in preparation for competition.
- Description: Doctor of Philosophy
Special needs, special play? Examining the agency of children with impairments in play-based learning in a special school
- Authors: Claughton, Amy
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Play is an inherent part of childhood, often cast as an innate behaviour of children. Over the years, play has been scrutinised by theorists, researchers and educators alike in their attempts to understand how children engage in play, the role of play in development and how to identify, define and measure play. For children with impairments, play is frequently subjected to surveillance and compared to that of children whose development is considered typical. This thesis interrogates the play-based learning experiences of five children who attended a special educational school in rural Victoria, Australia. It examines the experiences that these children had in play and how teacher actions and responses enabled and supported their engagement in play-based learning. The theoretical framework for this study draws on critical ethnography underpinned by disability studies. Disability studies recognises the social model of disability, in which disability is a social construction. Using this model, impairment is distinct and separate from disability. In this study, socially constructed barriers that confront children in their play are identified as being created by attitudes, structures and environments (Bishop et al., 1999). These barriers are overlaid by the psycho-emotional dimensions of disability (C. Thomas, 1999) in an effort to represent the experiences of children as shaped by the actions and responses of others. This thesis introduces a new analytic tool in the learning portal framework. The learning portal framework aims to provide a platform through which teacher actions and responses can be analysed to understand how children are enabled to access play-based learning. The findings of this study indicate that children with impairments play in complex and nuanced ways. They show purpose in their play, are able to self-initiate, and independently investigate play-based learning experiences. Adult actions and responses often enable children with impairments to engage in play by offering opportunities and pathways for exploration. Indirect adult facilitation in play supports children’s ability to act in play with individuality and determination.
- Description: Doctor of Philosophy
- Authors: Claughton, Amy
- Date: 2020
- Type: Text , Thesis , PhD
- Full Text:
- Description: Play is an inherent part of childhood, often cast as an innate behaviour of children. Over the years, play has been scrutinised by theorists, researchers and educators alike in their attempts to understand how children engage in play, the role of play in development and how to identify, define and measure play. For children with impairments, play is frequently subjected to surveillance and compared to that of children whose development is considered typical. This thesis interrogates the play-based learning experiences of five children who attended a special educational school in rural Victoria, Australia. It examines the experiences that these children had in play and how teacher actions and responses enabled and supported their engagement in play-based learning. The theoretical framework for this study draws on critical ethnography underpinned by disability studies. Disability studies recognises the social model of disability, in which disability is a social construction. Using this model, impairment is distinct and separate from disability. In this study, socially constructed barriers that confront children in their play are identified as being created by attitudes, structures and environments (Bishop et al., 1999). These barriers are overlaid by the psycho-emotional dimensions of disability (C. Thomas, 1999) in an effort to represent the experiences of children as shaped by the actions and responses of others. This thesis introduces a new analytic tool in the learning portal framework. The learning portal framework aims to provide a platform through which teacher actions and responses can be analysed to understand how children are enabled to access play-based learning. The findings of this study indicate that children with impairments play in complex and nuanced ways. They show purpose in their play, are able to self-initiate, and independently investigate play-based learning experiences. Adult actions and responses often enable children with impairments to engage in play by offering opportunities and pathways for exploration. Indirect adult facilitation in play supports children’s ability to act in play with individuality and determination.
- Description: Doctor of Philosophy
Optimising the management of invasive aquatic plants targeted for extirpation from catchments and waterways : Utilising alligator weed (Alternanthera philoxeroides (Mart.) Griseb.) as a target species
- Authors: Clements, Daniel
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: Aquatic plants are integral components of freshwater ecosystems and provide essential ecosystem services. However, when invasive species establish in new aquatic environments, there are few natural checks and balances to inhibit their growth and spread. Overabundant aquatic vegetation can harm aquatic systems if left unchecked and negatively impact on agricultural productivity, social amenity and biodiversity values. Prevention and early intervention are recognised as the most cost effective means to manage invasive species that pose a biosecurity risk. This thesis contributes to the development of effective management strategies for one of the world’s most invasive aquatic plant species, known as alligator weed (Alternanthera philoxeroides (Mart.) Griseb.). It focusses on developing management strategies in an early stage of invasion, in order to achieve extirpation of this species from catchments and waterways. Developing effective detection and surveillance strategies are required for invasive aquatic plants, as a key impediment to achieving extirpation is the ability to detect infestations, so that control strategies can be enacted. This thesis investigates the effectiveness of aerial surveillance for detection of alligator weed at different spatial scales, using high altitude aerial imagery (orthophotos) and unmanned aerial vehicle (UAV) technology. An examination of the growth rate of alligator weed in Victoria, Australia, over a five year period, demonstrates the effective use of orthophotos to detect and monitor large infestations of aquatic alligator weed. The efficacy of unmanned aerial vehicle technology, including the use of automated algorithms, to detect patches of alligator weed growing in waterways is evaluated against current detection techniques. Effective management of invasive aquatic plants targeted for extirpation requires the coupling of effective detection and control efforts to prevent reproduction. To date, development of control strategies for aquatic alligator weed has been limited to evaluating the efficacy of short-term control at a local scale without regard to the effects of management strategies on dispersal of propagules throughout catchments. This thesis determines that viable alligator weed stem fragments are produced following herbicide application, which comprises extirpation efforts. This thesis has gone further than current practice in that it has evaluated the efficacy of current and novel control techniques, in both laboratory and field trials and has developed methods to manage viable fragment production post-herbicide application, to limit dispersal throughout catchments. In this respect, the application of the herbicides glyphosate, metsulfuron-methyl and imazapyr, and their effectiveness when incorporating surfactant systems and plant growth regulators, have been evaluated in field and laboratory studies to optimise control techniques for aquatic alligator weed. Results have shown that our approaches, when used in an early stage of invasion, are capable of eliminating patches of alligator weed in two to three years. Integral to the research is an experiment to determine the effect of herbicide treatments on the production of alligator weed stem fragments and their subsequent viability. Further investigation to determine the usefulness of commercially available plant growth regulators (PGRs) to reduce the number of viable propagules produced by alligator weed post-herbicide application was found to be ineffective. This thesis also evaluates the impact of herbicides and surfactant systems, on all key alligator weed response metrics in aquatic environments including; above ground biomass, below ground biomass and viable stem fragmentation. No previous studies have looked simultaneously at these three important measures for determining the efficacy of a particular control regime, and we have determined that this is essential for effective management of aquatic alligator weed in an early stage of invasion. The thesis has underscored the notion that development of more effective management strategies, based upon experimental trials, will result in an increased likelihood of eradicating invasive aquatic plants that pose a biosecurity risk, and thus move toward the mitigation of the threat that high-risk species pose to aquatic ecosystems. PLEASE NOTE: Portions of the full text have been removed due to copyright restrictions.
- Description: Doctor of Philosophy
- Authors: Clements, Daniel
- Date: 2017
- Type: Text , Thesis , PhD
- Full Text:
- Description: Aquatic plants are integral components of freshwater ecosystems and provide essential ecosystem services. However, when invasive species establish in new aquatic environments, there are few natural checks and balances to inhibit their growth and spread. Overabundant aquatic vegetation can harm aquatic systems if left unchecked and negatively impact on agricultural productivity, social amenity and biodiversity values. Prevention and early intervention are recognised as the most cost effective means to manage invasive species that pose a biosecurity risk. This thesis contributes to the development of effective management strategies for one of the world’s most invasive aquatic plant species, known as alligator weed (Alternanthera philoxeroides (Mart.) Griseb.). It focusses on developing management strategies in an early stage of invasion, in order to achieve extirpation of this species from catchments and waterways. Developing effective detection and surveillance strategies are required for invasive aquatic plants, as a key impediment to achieving extirpation is the ability to detect infestations, so that control strategies can be enacted. This thesis investigates the effectiveness of aerial surveillance for detection of alligator weed at different spatial scales, using high altitude aerial imagery (orthophotos) and unmanned aerial vehicle (UAV) technology. An examination of the growth rate of alligator weed in Victoria, Australia, over a five year period, demonstrates the effective use of orthophotos to detect and monitor large infestations of aquatic alligator weed. The efficacy of unmanned aerial vehicle technology, including the use of automated algorithms, to detect patches of alligator weed growing in waterways is evaluated against current detection techniques. Effective management of invasive aquatic plants targeted for extirpation requires the coupling of effective detection and control efforts to prevent reproduction. To date, development of control strategies for aquatic alligator weed has been limited to evaluating the efficacy of short-term control at a local scale without regard to the effects of management strategies on dispersal of propagules throughout catchments. This thesis determines that viable alligator weed stem fragments are produced following herbicide application, which comprises extirpation efforts. This thesis has gone further than current practice in that it has evaluated the efficacy of current and novel control techniques, in both laboratory and field trials and has developed methods to manage viable fragment production post-herbicide application, to limit dispersal throughout catchments. In this respect, the application of the herbicides glyphosate, metsulfuron-methyl and imazapyr, and their effectiveness when incorporating surfactant systems and plant growth regulators, have been evaluated in field and laboratory studies to optimise control techniques for aquatic alligator weed. Results have shown that our approaches, when used in an early stage of invasion, are capable of eliminating patches of alligator weed in two to three years. Integral to the research is an experiment to determine the effect of herbicide treatments on the production of alligator weed stem fragments and their subsequent viability. Further investigation to determine the usefulness of commercially available plant growth regulators (PGRs) to reduce the number of viable propagules produced by alligator weed post-herbicide application was found to be ineffective. This thesis also evaluates the impact of herbicides and surfactant systems, on all key alligator weed response metrics in aquatic environments including; above ground biomass, below ground biomass and viable stem fragmentation. No previous studies have looked simultaneously at these three important measures for determining the efficacy of a particular control regime, and we have determined that this is essential for effective management of aquatic alligator weed in an early stage of invasion. The thesis has underscored the notion that development of more effective management strategies, based upon experimental trials, will result in an increased likelihood of eradicating invasive aquatic plants that pose a biosecurity risk, and thus move toward the mitigation of the threat that high-risk species pose to aquatic ecosystems. PLEASE NOTE: Portions of the full text have been removed due to copyright restrictions.
- Description: Doctor of Philosophy