6,818 results for 2011

  • Evolution of a Networked Learning Community: Interweaving action-research and programme evaluation to create a PK-20 school-university collaborative partnership for learning and innovation

    Fickel LH; Chesbro P; Tucker S; Boxler N (2011)

    Conference Contributions - Other
    University of Canterbury Library

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  • Culturally Responsive Practice - It's not just for the kids: Exploring a CRT framework for professional learning

    Fickel LH; Chesbro P; Boxler N (2011)

    Conference Contributions - Other
    University of Canterbury Library

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  • Even if you say it three ways, it still doesn't mean it's true: The pervasiveness of heteronormativity in early childhood education

    Gunn, Alexandra C. (2011)

    Journal article
    University of Otago

    Peer Reviewed

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  • Tag Clouds in Software Visualisation

    Deaker, Chris; Churcher, Neville; Irwin, Warwick (2011)

    Doctoral thesis
    University of Canterbury Library

    Software visualisation employs techniques from the more general information visualisation field to help software engineers comprehend and manage the size and complexity of software systems. In this paper, we explore the use of tag clouds for software visualisation. We describe a tool which implements our approach and illustrate its operation with examples from our software engineering research programme.

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  • The Fallout of Single Glazing under Radiant Heat Exposure

    WONG, Daniel Liang Wei (2011)

    Doctoral thesis
    University of Canterbury Library

    Glass fallout in windows has the potential to alter the ventilation condition and the behaviour of the fire in a compartment. Therefore, it is of an interest to fire modellers to be able to simulate the behaviour of glass windows in fires. Most research work has dealt with the fracture of glass windows in fires while some work studied the glass fallout behaviour in the general sense. This research investigated the fallout behaviour of 4 mm and 6 mm thick single glazed glass exposed to a radiant heat source. Only ordinary float type glass was studied in this research. The fallout behaviour of glass was quantified in a probabilistic manner based on the fallout results from the experiments. Standard rubber beadings and non-standard beadings made of kaowool fibres were used to glaze the glass samples in this research. A total of 117 experiments were carried out in this research. The radiant heat fluxes which the glass samples were exposed to ranged from 13 kW/m2 to 58 kW/m2 . In some experiments, the temperature at various points on the glass and thermal strains were measured. Radiant heat flux measurements were also taken during the experiments. The time to glass fracture and amount of fallout were recorded in every experiment. The four-point bending test was carried out on 24 glass specimens to determine the fracture strength and modulus of elasticity for the glass panes used in this research. The mean fracture strength and modulus of elasticity were 64 MPa ± 15 MPa and 76.5 ± 4.0 MPa respectively. The simple lumped heat capacity method was used to predict the time to glass fracture in each experiment. Generally, the times to glass fracture recorded in the experiments were within the predicted times to glass fracture in 60% of the experiments. The distribution of temperature differences at fracture was predicted using the fracture criterion suggested by Keski-Rahkonen (1988). The range of predicted temperature differences at glass fracture was compared with the temperature differences obtained from the experiments. The mean temperature difference at glass fracture ranged from 90 °C to 98 °C while the predicted temperature differences were between 55 °C to 129 °C. Generally, the actual temperature differences were within range of predicted temperature differences in 60% of the experiments. The measured thermal strains at glass fracture were between 239 Pstrain to 697 Pstrain. The type of glazing beading was concluded not to have affected the glass fallout behaviour. It was found that a window with a thinner glass pane is more likely to fallout compared with a window with II a thicker glass pane when exposed the same level of heat flux. The fallout behaviour of glass was quantified with an exponential distribution function and a glass fallout prediction model for 4 mm and 6 mm thick glass was produced from the experimental results.

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  • Chemical and biological explorations of the electrophilic reactivity of the bioactive marine natural product halenaquinone with biomimetic nucleophiles

    Wang, J; Bourguet-Kondracki, M-L; Longeon, A; Dubois, J; Valentin, A; Copp, Brent (2011-02-15)

    Journal article
    The University of Auckland Library

    The electrophilic reactivity of the bioactive marine sponge natural product halenaquinone has been investigated by reaction with the biomimetic nucleophiles N-acetyl-L-cysteine and N(??)-acetyl-L-lysine. While cysteine reacted at the vacant quinone positions C-14 and C-15, lysine was found to react preferentially at the keto-furan position C-1. A small library of analogues was prepared by reaction of halenaquinone with primary amines, and evaluated against a range of biological targets including phospholipase A(2), farnesyltransferases (FTases) and Plasmodium falciparum. Geranylamine analogue 11 exhibited the most potent activity towards FTases (IC(50) 0.017-0.031 ??M) and malaria (IC(50) 0.53-0.62 ??M).

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  • Grounded Theory for geeks

    Hoda, Rashina; Noble, J; Marshall, S (2011)

    Conference item
    The University of Auckland Library

    Grounded Theory (GT) is gaining popularity as research method in Software Engineering; however, it is still not widely understood. We present some patterns based on the use of GT to study Software Engineering contexts including our own experiences of applying classic GT in an attempt to make it more accessible for Software Engineering researchers (aka 'geeks').

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  • Behavioral Studies of Project Dispute Negotiation in Engineering and Construction: Visit to Bandura's Self-Efficacy Theory

    Yiu, Tak Wing; Cheung, SO (2011)

    Journal article
    The University of Auckland Library

    This essay explains project dispute negotiation as it widely applies to the engineering management and provides a short review of the behavioral studies of project dispute negotiation. Furthermore, a popular psychological theory, Bandura???s self-efficacy theory, is introduced. The potential research opportunities of researching and applying this theory are also discussed in the last section of this forum.

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  • Marine natural products

    Blunt, JW; Copp, Brent; Munro, MHG; Northcote, PT; Prinsep, MR (2011-02)

    Journal article
    The University of Auckland Library

    Covering: 2009.

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  • Economic growth, agriculture and poverty reduction in Cambodia

    Ngin, C (2011-03-06)

    Conference item
    The University of Auckland Library

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  • Bioactive Indole Derivatives from the South Pacific Marine Sponges Rhopaloeides odorabile and Hyrtios sp.

    Longeon, A; Copp, Brent; Quevrain, E; Roue, M; Kientz, B; Cresteil, T; Petek, S; Debitus, C; Bourguet-Kondracki, M-L (2011-05-24)

    Journal article
    The University of Auckland Library

    Indole derivatives including bromoindoles have been isolated from the South Pacific marine sponges Rhopaloeides odorabile and Hyrtios sp. Their structures were established through analysis of mass spectra and 1D and 2D NMR spectroscopic data. Their potential inhibitory phospholipase A2 (PLA2), antioxidant and cytotoxic activities were evaluated. The new derivative 5,6-dibromo-l-hypaphorine (9) isolated from Hyrtios sp. revealed a weak bee venom PLA2 inhibition (IC50 0.2 mM) and a significant antioxidant activity with an Oxygen Radical Absorbance Capacity (ORAC) value of 0.22. The sesquiterpene aureol (4), also isolated from Hyrtios sp., showed the most potent antioxidant activity with an ORAC value of 0.29.

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  • Establishment of the absolute configuration of the bioactive marine alkaloid eudistomin X by stereospecific synthesis

    Finlayson, R; Brackovic, A; Simon-Levert, A; Banaigs, B; O'Toole, RF; Miller, CH; Copp, Brent (2011-02-16)

    Journal article
    The University of Auckland Library

    A stereospecific synthesis of both enantiomers of the marine alkaloid eudistomin X using the amino acid chiral pool is achieved. Comparison of 1H and 13C NMR chemical shifts of the synthetic product as either the free base, mono-salt or disalt with those reported for the natural product established that the ascidian metabolite was originally characterised as a mono-salt and that the absolute configuration was (10R).

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  • Didemnidines A and B, indole spermidine alkaloids from the New Zealand ascidian Didemnum sp.

    Finlayson, R; Pearce, Allison; Page, MJ; Kaiser, M; Bourguet-Kondracki, M-L; Harper, JL; Webb, VL; Copp, Brent (2011-02-24)

    Journal article
    The University of Auckland Library

    Two new indole spermidine alkaloids, didemnidines A (1) and B (2), have been isolated from the New Zealand ascidian Didemnum sp. The structures of the metabolites, determined by analysis of 2D NMR spectra and confirmed via synthesis, embody an indole-3-glyoxylamide moiety linked to the N(1) position of spermidine, the latter motif being particularly rare among marine natural products. Didemnidine B and a synthetic precursor exhibited mild in vitro growth inhibition of Plasmodium falciparum with IC(50)'s of 15 and 8.4 ??M, respectively.

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  • Antimalarial ??-Carbolines from the New Zealand Ascidian Pseudodistoma opacum

    Chan, STS; Pearce, Allison; Page, MJ; Kaiser, M; Copp, Brent (2011-09-23)

    Journal article
    The University of Auckland Library

    One tetrahydro-??-carboline, (-)-7-bromohomotrypargine (1), and three alkylguanidine-substituted ??-carbolines, opacalines A, B, and C (2-4), have been isolated from the New Zealand ascidian Pseudodistoma opacum. The structures of the metabolites were determined by analysis of mass spectrometric and 2D NMR spectroscopic data. Natural products 2 and 3, synthetic debromo analogues 8 and 9, and intermediate 16 exhibited moderate antimalarial activity toward a chloroquine-resistant strain of Plasmodium falciparum, with an IC50 range of 2.5-14 ??M. The biosynthesis of 1-4 is proposed to proceed via a Pictet-Spengler condensation of 6-bromotryptamine and the ??-keto acid transamination product of either arginine or homoarginine. Cell separation and 1H NMR analysis of P. opacum identified tetrahydro-??-carboline 1 to be principally located in the zooids, while fully aromatized analogues 2-4 were localized to the test.

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  • Benchmarking and modeling disk-based storage tiers for practical storage design

    Lee, Dong Jin; O'Sullivan, Michael; Walker, Cameron (2011)

    Conference item
    The University of Auckland Library

    This paper presents benchmark experiments for designing an optimal archival storage system. The benchmark utilizes archival workloads developed from an analysis of historical file size distributions. The workloads provide more appropriate measurements of system performance as an archive than traditional approaches. We use these benchmarks to measure disk-based archival systems. We then consider designing an archival system based on our benchmark measurements and produce a low cost design for a commodity disk-based archival storage system. Combining results of predictions along with our optimization-driven design, we discover an ideal building block for an archival storage system.

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  • Relationship between walk tests and parental reports of walking abilities in children With cerebral palsy

    Chong, J; Mackey, Anna; Broadbent, Elizabeth; Stott, Ngaire (2011-02)

    Journal article
    The University of Auckland Library

    Objectives To test the strength of association between 2 clinic-based measures of walking ability, the 1-minute walk test (1MWT) and the six-minute walk test (6MWT), and the parental report of usual walking performance, measured by the ABILOCO-Kids logit score, in children with cerebral palsy (CP). Design Observational study. Setting Tertiary level outpatient clinics. Participants Children and youth with CP (N=60; 32 boys, 28 girls; mean age, 11.2y [range, 5???18y]), Gross Motor Function Classification System (GMFCS) level I to IV. Interventions Not applicable. Main Outcome Measures The 10-item ABILOCO-Kids questionnaire, the 1MWT, and the 6MWT. Results ABILOCO-Kids logit scores were significantly correlated with the 1MWT (??=.70, P

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  • Evaluating the use of stereo-photogrammetry for gravel-bed roughness analysis

    Bertin, Stephane; Friedrich, Heide; Heays, K (2011)

    Conference item
    The University of Auckland Library

    In this work, three different measurement technologies are employed to study the hydraulic roughness in a laboratory flume with a gravel-bed. The gravel-bed topography is measured with (i) an acoustic bed-profiler; (ii) a hand-held laser-scanner; and (iii) stereo-photogrammetry. Digital Elevation Models (DEMs) are obtained with each technique. Statistical roughness analyses of the DEMs are undertaken by estimating the vertical roughness length, represented by the standard deviation of bed elevations. In addition, Probability Distribution Functions (PDFs) and two-dimensional second-order structure functions of bed elevations are used for the analyses. All three measurement techniques were found precise enough to reach the grain-scale of laboratory gravel-beds. However, important disparities were found between the DEMs, which were not always visible statistically. The acoustic bed-profiler and the laser-scanner were found suitable for gravel-bed roughness characterisation. With stereo-photogrammetry, the complex operational processes must be improved to obtain realistic high-resolution DEMs and to derive faithful statistics.

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  • Do New Zealand children with non-cystic fibrosis bronchiectasis show disease progression?

    Munro, KA; Reed, PW; Joyce, H; Perry, D; Twiss, J; Byrnes, Catherine; Edwards, EA (2011-02)

    Journal article
    The University of Auckland Library

    Background There is minimal literature available on the long-term outcome of pediatric non-cystic fibrosis (CF) bronchiectasis. Aim To document 5-year outcomes of children with chest computerized tomography (CT) scan diagnosed bronchiectasis from a tertiary New Zealand (NZ) respiratory clinic. Methods Review of a clinical database identified 91 children. Demographics, clinical data, lung function, chest X-ray (CXR), sputum, presumed etiology, admission data, and the NZ deprivation index (NZDep) were collected. Univariate and multivariate regression were used to correlate clinical findings with lung function data and CXR scores using the Brasfield Scoring System.

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  • Modelling collagen fibre orientation in porcine skin based upon confocal laser scanning microscopy

    Jor, Jessica; Nielsen, Poul; Nash, Martyn; Hunter, Peter (2011)

    Journal article
    The University of Auckland Library

    Background: The mechanical properties of skin, and its ability to resist a wide range of deformations, are mainly determined by the collagen network within the dermis. Aims: In order to quantify the structure???function relationship of skin, quantitative data on collagen orientation are acquired in this study. Materials & Methods: Saggital cryosections from the abdominal region of young pigs were stained with picrosirus red for collagen detection and images were acquired by confocal laser scanning microscopy (CLSM). Spatial distributions of collagen orientation were determined using a structure???tensor approach. Orientation data were fitted to a mixture of two von Mises distributions. Results: It was observed that collagen is organised into large bundles in the reticular dermis that run obliquely between the epidermis to hypodermis along two predominant orientations. Discussion: This distinct lattice structure was apparent in all sections, regardless of the sectioning orientation. Based on our observations from CLSM images,we propose a conceptual model expressed in terms of a density distribution function to describe collagen orientation. Conclusion: We demonstrate that two parameters of this distribution (the mean and spread parameter) may be directly determined using CLSM image analysis. An important advantage of this approach is that model parameters can be estimated directly from observable microstructural features.

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  • A discrete model to study reaction-diffusion-mechanics systems

    Weise, LD; Nash, Martyn; Panfilov, AV (2011-07-11)

    Journal article
    The University of Auckland Library

    This article introduces a discrete reaction-diffusion-mechanics (dRDM) model to study the effects of deformation on reaction-diffusion (RD) processes. The dRDM framework employs a FitzHugh-Nagumo type RD model coupled to a mass-lattice model, that undergoes finite deformations. The dRDM model describes a material whose elastic properties are described by a generalized Hooke's law for finite deformations (Seth material). Numerically, the dRDM approach combines a finite difference approach for the RD equations with a Verlet integration scheme for the equations of the mass-lattice system. Using this framework results were reproduced on self-organized pacemaking activity that have been previously found with a continuous RD mechanics model. Mechanisms that determine the period of pacemakers and its dependency on the medium size are identified. Finally it is shown how the drift direction of pacemakers in RDM systems is related to the spatial distribution of deformation and curvature effects.

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