89,479 results

  • Evaluation of the new approach to improving compact-compact antenna baseline in VLBI

    Takiguchi, H; Ishii, A; Ichikawa, R; Koyama, Y (2012-04-23)

    Conference item
    Auckland University of Technology

    No abstract

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  • Globalised desk-top skirmishes? Reporting from the colonies

    Engels-Schwarzpaul, A.-Chr. (2013-10-22)

    Book item
    Auckland University of Technology

    No abstract.

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  • Immersive Virtual Environments to facilitate authentic education in Logistics and Supply Chain Management

    Reiners, T; Wood, LC (2013-11-11)

    Book item
    Auckland University of Technology

    This chapter will cover our current research focus concerning developing and trialling immersive environments as an innovative and authentic approach to teaching and learning in Logistics and Supply Chain Management, incorporating seamlessly integrated assessment and feedback. Developed educational and assessment tools will allow students to demonstrate that they have successfully applied theoretical knowledge in real contexts and developed appropriate skills before entering the workforce. Greater authenticity allows students to experience different roles and exposes them to multiple business cases over supply chains that, in reality, span the globe. The project addresses the inauthentic pedagogical approaches in current classroom and distance-learning environments, and will propose a methodology that utilises existing technologies. The simulation will combine emerging technologies to represent multiple problem dimensions into one space; enabling students to observe, engage, interact, and participate in self-guided or group-based learning scenarios; receiving instant, multi-perspective, media-rich feedback to support their learning; and enabling further iterative scenario-based training.

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  • Achieving transmission fairness in distributed medium access wireless mesh networks: design challenges, guidelines and future directions

    Undugodage, SP; Sarkar, NI (2013-07-02)

    Journal article
    Auckland University of Technology

    Wireless mesh networking gained an international interest over the years as a result to high recognition in the wireless industry as a cost effective, scalable, wider coverage and capacity capable wireless technology. The contention based distributed medium access in wireless networks has advanced not only in supporting the quality of multimedia but also achieving high throughput and to minimize packet delay overheads in legacy systems. Unfortunately, the impact of such enhancement has not been fully justified with mesh network environments yet. The medium access frames are required to be contended over multi-hops to overcome the challenges of improving overall system performance through concurrent transmissions. The goal of this paper is to discuss the issues and challenges of transmission fairness and the effect of concurrent transmission on system performance. To mitigate transmission fairness issues, we review existing open literature on mesh networking and provide guidelines for better system design and deployment. Finally, we conclude the paper with future research directions. This study may help network designer and planner to overcome the remaining challenging issues in the design and deployment of WMNs worldwide.

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  • Market timing ability and mutual funds: a heterogeneous agent approach

    Frijns, B; Gilbert, A; Zwinkels, RCJ (2013-10-25)

    Journal article
    Auckland University of Technology

    This paper proposes a novel approach to determine whether mutual funds time the market. The proposed approach builds on a heterogeneous agent model, where investors switch between cash and stocks depending on a certain switching rule. This represents a more flexible, intuitive, and parsimonious approach. The traditional market timing models are essentially a special case of our model with contemporaneous switching rule. Applying this model to a sample of 400 US equity mutual funds, we find that 41.5% of the funds in our sample have negative market timing skills and only 3.25% positive skills. 20% of funds apply a forward:looking approach in deciding on market timing, and 13.75% a backward looking approach. We also note that market timing differs considerably over fund styles.

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  • Why do financial literacy programmes fail?

    Frijns, BPM; Gilbert, A; Tourani-Rad, A (2013-10-25)

    Journal article
    Auckland University of Technology

    Numerous studies have found a positive relationship between financial literacy and financial experience. Typically, this relationship is interpreted as being a causal relationship, i.e. an increase in financial literacy leads to better financial decision making. However, a simple relationship cannot be interpreted in a causal way. In this paper, we show evidence for a causal relationship running the opposite way, i.e. people with more financial experience seem to acquire more financial knowledge and become more financially literate. This finding has important implications as it suggests that programmes targeted at improving financial literacy could be more effective if they incorporate experiential components.

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  • Coopetition in supply chains: a case study of a coopetitive structure in the horticulture industry

    Wood, LC (2013-11-11)

    Book item
    Auckland University of Technology

    Supply chain management has been increasingly seen as a strategic tool to improve the competitiveness of companies. Coopetition, the mingling of competitive and cooperative relationships, has been utilised by New Zealand companies in the horticulture industry to help break into and develop new markets. Using a case study various elements of the supply chain are examined from both strategic and operational perspectives for this group of companies and their customers and suppliers. The connections to the customer are shown to be enhanced through careful implementation, as the group of companies act to adjust their entire supply chains to make them increasingly customer-orientated. Significant benefits that are shown to accrue include improved information flow, increased ability to supply, and flexibility to meet customer requirements.

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  • Poverty reduction strategies via public-private partnerships: the role of e-government solutions in supporting supplier diversity programmes

    Jeeva, AS; Wood, LC (2013-11-11)

    Book item
    Auckland University of Technology

    Government procurement practices influence large volumes of spending in communities and further procurement can be influenced through legislative efforts. Through these mechanisms government bodies carry significant influence on the way in which procurement spend occurs and they have the ability to influence the direction that the procurement may take. Carefully constructed parameters in public-private partnerships (PPP) can shift the focus of procurement activities towards engaging with the local businesses and communities. This represents an approach for government bodies to increase supplier diversity so that, in alignment with UN Millennium goals of poverty reduction, local suppliers can be provided with business opportunities and methods to reduce poverty. A two-focus approach is adopted; first, government drivers and policies are examined in the context of social engagement. Second, the roles and challenges faced by small firms in the local communities are highlighted. This demonstrates the way in which e-government procurement systems play a pivotal role in supporting local sourcing initiatives.

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  • Married female Emirati students pursuing Higher Education: striking a balance

    Tennant, L; Saqr, S; Stringer, P

    Conference item
    Auckland University of Technology

    Opportunities for females to pursue higher education in the United Arab Emirates (UAE) has been recognized as important and strengthened significantly over the last decade. Our research was an attempt to gain insight on the challenges and barriers faced by female married Emirati students while undertaking B. Ed degrees at Emirates College of Advanced Education. The research was positioned within a sociocultural framework of the UAE context. Does a ‘One size fits all’ model in higher education programs cater equally for the needs of married and unmarried students? With this in mind, our research aimed to: • Identify challenges faced by female, married Emirati students pursuing careers as future teachers of the UAE • Determine strategies used by female, married Emirati students to overcome their particular challenges • Identify support systems that influence this group of students and facilitate their studies • Design and develop support systems at the college level intended to assist female, married students complete their studies successfully. The discussion we propose will be initiated by sharing a summary of the findings gained from a survey conducted with 100 female, married Emirati students at different stages of their study (Cohort groupings years 1-4). The conversation will illuminate the challenges faced by this group of students and the complexities of balancing married life juxtaposed with the demands of being a student teacher within a 21st century tomorrow’s schools framework. The need for tertiary level support services that empower and support the female, married Emirati student will also be discussed within the lived reality of family, community and society at large.

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  • An experimental investigation of turbulent forced convection heat transfer by a multi-walled carbon-nanotube nanofluid

    Piratheepan, M; Anderson, TN

    Journal article
    Auckland University of Technology

    Abstract In this work, a nanofluid based on multi-walled carbon nanotubes was formulated, and its heat transfer characteristics experimentally examined for turbulent flow in a straight tube. The experiments found that using the nanofluid resulted in an increase in pumping power and also a decrease in the observed convective heat transfer characteristics. This suggests that multi-walled carbon nanotube nanofluids in turbulent flows will actually impair heat transfer rather than improve it, and so may not be an appropriate heat transfer media in forced turbulent flows.

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  • How to be a Prehistoric Weatherman: Using n-alkanes as a Proxy for Holocene Climate and Hydrology, Southwest South Island, New Zealand

    Burrington, Peter (2015)

    Masters thesis
    University of Otago

    The latitudinal position and strength of the Southern Hemisphere westerly winds (SHWW) plays a critical role in global CO2 air-sea flux and the distribution of rainfall in the southern mid-latitudes. Strengthening and southward shifting westerlies are thought to be reducing the efficiency of the Southern Ocean carbon sink, which has direct implications for modern atmospheric CO2 concentrations. Southern New Zealand intersects the northern margin of the SHWW belt, where a direct relationship exists between annual precipitation and zonal wind speeds. Reconstructing past hydrological variations from the southwest of the South Island (SWSI) can provide a regional record of climatic response to changing SHWW. A 5.4 m sediment core spanning the last 10.8 ka was recovered from South Mavora Lake, Southland. Magnetic susceptibility, bulk organic C and N isotopes and concentrations, and lipid biomarker (C21-C33 n-alkanes) concentrations, distributions, and hydrogen isotope values (δD) serve as proxies for change in lacustrine productivity, relative proportions of terrestrial and aquatic input, and hydrology. Modern SWSI meteoric water isotope values (δ18O, δD) collected over a 12-month period, and meteorlogical station data, show orographic rainout and air temperature are the primary drivers of hydrological isotope composition in SWSI. Downcore interpretation of data suggests a period of increased precipitation, rapid warming, and greater terrestrial input from 10.8-9.0 ka, likely corresponding to weaker westerly influence over SHWW. From 9.0-7.0 ka, decreasing δDn-alkanes shows gradual cooling, δ13C and ACL suggest increased aquatic productivity, and stratigraphy shows an increase in storm strength. From 7.0-5.1 ka δDn-alkanes and δ13C are characteristic of a relatively stable temperate climate, Paq and C/N ratios suggest a relatively humid environment, and stratigraphy showed an increase of storm events. From 5.1-3.6 ka δDn-alkanes showed a large cold excursion followed by gradual warming, Paq and stratigraphy reflected a significant increase in storm event frequency and strength, and an increase in ACL reflected the expansion of cool-moist Nothofagus menziesii into the region. From 3.6 ka to present δDn −alkanes showed a cooling trend to present day, likely related to strengthening of the SHWW, and low amplitude and frequency variation in Paq and decreased storm events signaled a gradual decrease in precipitation to modern day conditions.

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  • Development of an aluminium filled epoxy insert using perfactory rapid prototyping technique and electroless nickel plating for low volume plastic injection moulding

    Rajaguru, Janaka Chandraguptha (2015)

    Doctoral thesis
    University of Waikato

    In this research, a rapid tool for low volume production plastic injection moulding is designed, developed, and tested on an injection moulding machine. The tool is designed as a cavity insert of injection mould for plastic parts by an indirect rapid tooling approach. The plastic part is modelled in a CAD system and then built using a Perfactory rapid prototyping (RP) technique. Then a layer of nickel-phosphorous alloy is deposited on the prototype by electroless plating. This nickel plated RP model is then used as a casting pattern. A cavity insert, which is produced by using aluminium filled epoxy resin with the nickel plated casting pattern, is fabricated in a mould base for injection moulding. Experimental testing on the cavity insert using an injection moulding machine show that the tool is producing quality parts without any noticeable deterioration of the surface. The number of shots completed using the cavity insert is more than 600. Applying electroless nickel plating on the casting pattern made of rapid prototyping material was successful. It was found that pre-treatment processes are crucial. In addition, the rapid prototyping material cannot be plated with nickel without palladium activation and stannous sensitising. Results show that the deposited layer is uniform and composed of both nickel and phosphorous. The surface properties of the nickel and phosphorous deposit enhance the plated layer performance due to their low surface roughness and high lubrication characteristics. Moreover, the nickel-phosphorous layer also improves the surface hardness of the cavity insert since it is left on the cavity after the removal of the casting pattern. The cavity insert was installed on an industrial injection moulding machine for trials. Results show that the cavity insert performs well with Polyethylene at 170˚C at an injection pressure in the range of 80 ~ 100 bar. There are no signs of wear and tear on the cavity insert up to 620 shots. However, when the injection pressure is over 120 bar, cracks start developing in the cavity insert followed by catastrophic fracture. This research has shown that manufacturing an indirect rapid tooling using electroless nickel plating for low volume production of plastic injection mouldings is feasible for Perfactory produced RP models. The cavity insert can be fabricated using commonly available low cost materials within 48 hours.

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  • Aspects of the biology of some New Zealand echinoderms : feeding, growth and reproduction in the asteroids, Patiriella regularis (Verrill, 1867) and Coscinasterias calamaria (Gray, 1840).

    Crump, Robin (1969)

    Doctoral thesis
    University of Otago

    192 leaves :illus. ; 30 cm. Bibliography: p.138-147. The author's "The flight response in Struthiolaria papulosa giges Sowerby", reprinted from the New Zealand journal of marine and freshwater research, v.2, no.3, Sept., 1968, in pocket. University of Otago department: Zoology

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  • A functional analysis of coral tools from late prehistoric Moloka'i Island, Hawaii.

    Dickson, Hamish (1999)

    Honours Dissertation thesis
    University of Otago

    1.1 Research Orientation During the course of archaeological fieldwork conducted late in 1978, 425 artifacts relating to fishhook manufacture were recovered from site 38 on Moloka'i Island in the Hawaiian chain. Fishhook manufacturing artifacts include Porities sp coral and echinoid urchin spine abraders, basalt flakes, bone fishhook blanks and bone fishhook debitage. Artifacts deemed coral abraders (precise definition will be given in a latter section) were studied from this site and will be the focus of this dissertation. It is generally believed that coral abraders were used to manufacture fishhooks for the following reasons: 1) Coral artifacts have been found in close association with fishhook manufacture (Emory, Bonk and Sinoto and Sinoto, 1959, Allen, 1992; Suggs 1961; Kirch and Yen 1982 and Buck 1957: and many others). 2) Early ethnographic accounts recorded in the journals of Captain James Cook by Joseph banks (Endeavor botanist), describe native Pacific islanders manufacturing fishhooks using coral files (Hawkesworth, 1773). 3) Use-wear analysis by Allen (1992) indicates that a large number of these tools may have been used to manufacture fishhooks. This dissertation as two main aims: 1) To form a classification system (non-classificatory arrangement; after Dunnel, 1971) for the purpose of ascertaining a functional to coral tools in relation to fishhook manufacture. 2) To devise a standardised system for the measurement of attributes on coral abraders that may aid future functional studies . Chapter one will set the scene, giving details regarding the background of the site under investigation. A definition and basic description of coral tools will be provided along with a review of the literature regarding coral artifacts. Chapter two is divided into two parts. The first part involves a brief review of the literature on classification systems and typology’s. Also in the first section, a justification will be given as to why the particular classification system was used. The second half of chapter two will involve a justification of attributes chosen to form the classification system. The third chapter involves a description of the methods used in measuring attributes and why these attributes were measured in this manor. This will be followed with a detailed description of each artifact class. Each class description will be accompanied with possible functions. The last chapter will be brief, involving conclusions and suggestions for future research. [extract from Introduction]

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  • The ethics of predictive risk modelling in the Aotearoa/New Zealand child welfare context: child abuse prevention or neo-liberal tool?

    Keddell, Emily (2014-07-28)

    Journal article
    University of Otago

    The current White Paper on Vulnerable Children before the Aotearoa/New Zealand (A/NZ) parliament proposes changes that will significantly reconstruct the child welfare systems in this country, including the use of a predictive risk model (PRM). This article explores the ethics of this strategy in a child welfare context. Tensions exist, including significant ethical problems such as the use of information without consent, breaches of privacy and stigmatisation, without clear evidence of the benefits outweighing these costs. Broader implicit assumptions about the causes of child abuse and risk and their intersections with the wider discursive, political and systems design contexts are also discussed. Drawing on Houston et. al. (2010) this paper highlights the potential for a PRM to contribute to a neo-liberal agenda that individualises social problems, reifies risk and abuse, and narrowly prescribes service provision. However, with reference to child welfare and child protection orientations, the paper suggests ways the model could be used in a more ethical manner.

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  • A Transcriptomic Examination of Sexual Differentiation in Zebrafish, Danio rerio

    Lee, Stephanie Ling Jie (2015)

    Doctoral thesis
    University of Otago

    Zebrafish sex determination and sexual differentiation is complex. Neither sex chromosomes, major sex-determining genes nor universal sex-linked markers have been identified, and a variety of environmental factors can influence sex ratios. It is thus unsurprising that the molecular pathways underpinning zebrafish sexual development remain poorly understood. A few key genes such as, SRY-box containing gene 9a (sox9a), anti-Müllerian hormone (amh), cytochrome P450, family 19, subfamily A, polypeptide 1a (cyp19a1a) are known to play roles in zebrafish gonadal differentiation. However, at this time, there are many more questions than answers about sex determination and differentiation in this ubiquitious, and immensely well-studied, species. As with many other vertebrates, sex hormone treatment can induce sex reversal of gonadal phenotype and sexual behaviour in zebrafish. In this study, we take advantage of hormonal manipulation of sex in developing zebrafish and RNA-Seq to unravel the unknown genetic pathways that underlie sex determination and sexual differentiation. We conducted global transcriptomic profiling of juvenile zebrafish brains and gonads at two important developmental stages in gonadal differentiation: (1) juvenile ovary-to-testis transformation (40 days post fertilization) and (2) the completion of testicular and ovarian differentiation (60 days post fertilization). Gene expression profiles from 17α-methyltestosterone masculinised juvenile zebrafish were also compared with untreated zebrafish to improve understanding of androgenic effects on zebrafish sexual differentiation pathways. To our knowledge, this is the first study profiling transcriptome-wide sex dimorphic gene expression in teleost brains during gonadal differentiation. We identified modest sex differences in developing zebrafish brains; 33 and 185 sex dimorphic genes were identified in the brains of 40 dpf and 60 dpf zebrafish respectively. Methyltestosterone treatment significantly altered expression patterns at both timepoints. We observed a total of 1,554 genes differentially expressed between control female brains and MT-treated brains at 40 dpf. 1,379 genes were differentially expressed between 40 dpf male brains and 40 dpf MT-treated brains. At 60 dpf, 728 genes exhibited differential expression between control female brains and MT-treated brains. Interestingly, significantly fewer genes (269) were differentially expressed between control male brains and MT-treated brains at 60 dpf. In contrast, we observed extensive sex differences in zebrafish gonadal transcriptomes. A total of 5,039 genes were sexually dimorphic at 40 dpf. 2,502 and 2,537 genes were up-regulated in transforming testes and juvenile ovaries respectively. At 60 dpf, we identified 4,190 testis-biased genes and 4,267 ovary-biased genes. Many of the sex dimorphic genes identified have no previous links with gonadal differentiation. Despite accelerated testicular development in MT-treated zebrafish, the numbers of differentially expressed genes identified when control ovaries were compared to control testes or MT-treated testes were similar. We identified 5,237 differentially expressed genes between 40 dpf juvenile ovaries and 40 dpf MT-treated testes. 7,513 genes were differentially expressed between ovaries and MT-treated testes at 60 dpf. There were considerably fewer differences between control testes and MT-treated testes. While 1,222 genes were differentially expressed between control testes and MT-treated testes at 40 dpf, only 20 genes separated the transcriptomes of 60 dpf control testes and MT-treated testes. It appears that androgen-induced masculinization shares key molecular regulators with normal testicular differentiation. A pair of rec8 genes were up-regulated in control testes and MT-treated testes. Testis-biased Rec8 expression was previously reported in mammals. Rec8 is required for sister chromatid cohesion, formation of synaptonemal complexes and homologous recombination during meiosis. To elucidate the functional significance of rec8 genes in testicular development, we characterized rec8 genes in adult zebrafish. Sequence homology, synteny and phylogenetic relationships between the zebrafish rec8 genes were explored in silico. Analysis of rec8a and rec8b gene expression in adult zebrafish confirmed testis-biased expression. Our work sets up a framework for which we can explore further functional testing of zebrafish rec8 genes using morpholino knockdown and CRISPR/Cas knockout technologies.

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  • Learning about and through teaching : Course work and practicum during initial teacher education

    Grudnoff, Lexie; Ward, Lorrae; Ritchie, Jenny; Brooker, Barry; Simpson, Mary (2013)

    Conference item
    Unitec

    This paper reports on findings from the final pilot of a survey (N=811) to be used by multiple New Zealand initial teacher education providers to measure graduating teacher perceptions of how well their programmes prepared them to start teaching. The survey, commissioned by the Teacher Education Forum of Aotearoa New Zealand (TEFANZ), is their proactive response to the political accountability demands that are a feature of teacher education internationally, and to the need for higher education to take a lead in the accountability ‘narrative’ (Shulman, 2007). This paper focuses on the perceptions of graduating student teachers regarding the learning opportunities provided to them during their ITE programmes. It compares opportunities during course work and practicum and suggests that more attention should be given to both components to ensure that student teacher learning is maximised in teacher preparation programmes.

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  • Visual arts education: Provoking learning conversations

    Wrightson, Helen; Plows, J. (2013-04-20)

    Conference item
    Unitec

    Visual arts praxis dilemmas can invoke uncertainty, calling for courage to engage in learning conversations that promote innovative ideas. These may challenge teachers but by engaging in dialogue can invite reflection and possible changes to practice. This workshop explores visual arts education and differing ideas teachers hold about children’s drawing, painting, printmaking and sculpture. Visual arts are a valuable mode for children to make meaning and express emotions so let’s talk and explore possibilities

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  • Culturally responsive practice as quality early childhood care and education provision.

    Ritchie, Jenny (2013)

    Conference item
    Unitec

    Over the last two decades New Zealand has become one of a small number of culturally and linguistically superdiverse countries. Superdiversity indicates a level of cultural complexity surpassing anything previously experienced. Aotearoa NZ is now home to 160 languages, forecasted to deepen even further. “Learning to interpret across cultures demands reflecting on our own experiences, analyzing our own culture, examining and comparing varying perspectives. We must consciously and voluntarily make our cultural lenses apparent. Engaging in the hard work of seeing the world as others see it must be a fundamental goal for any move to reform the education of teachers and their assessment”--Lisa Delpit Culturally responsive practice - Management and practitioners to demonstrate their awareness of historical, social, cultural and political contexts, and the impacts of past and current social, educational and economic policies in relation to contemporary inequities.

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  • Whaia te iti kahurangi: Relationships of Promise

    Ritchie, Jenny (2013)

    Conference item
    Unitec

    This talk will draw upon my recent writing, and on work from our Teaching and Learning Research Initiative project Titiro Whakamuri, Hoki Whakamua: We are the future, the present and the past: caring for self, others and the environment in early years’ teaching and learning. Pedagogies of care and affect, which resonate te ao Māori conceptualisations of inter-connectedness will be proposed as a source of optimism in response to the challenges that we face. One conceptual tool in response to these matters of concern is an ethic of care (Noddings 1995), applied in our recent study as the notion of ‘caring for ourselves, others and the environment’. A second conceptual tool is re-visibilisation and revalidation of Indigenous onto-epistemologies, which position humans as part of and reliant upon, rather than superior to and detached from our local and global world(s).

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