2,300 results for Conference item, ResearchSpace@Auckland

  • Numerical simulation and aeroacoustic noise modelling of a wind turbine using a blade section in an annulus

    Wasala, Sahan; Norris, Stuart; Cater, John (2014-11-19)

    Conference item
    The University of Auckland Library

    Noise disturbance from wind turbines is one of the major factors which slows wind farm development near populated areas. Therefore, it is important to have an accurate estimate of the noise generated before production and installation of wind turbines. Large Eddy Simulation (LES) can be used to determine the aerodynamic sound produced by a moving surface, but LES of a whole wind turbine is computationally expensive. However, Oerlemans’ field measurements show that most of the noise from wind turbines is generated at 75%-95% of the span of the blade. This suggests that simulation of a section with the most significant noise sources could lead to a useful overall noise estimate in the far field. The present work is focused on noise prediction from a wind turbine using a rotational annulus containing a section of a wind turbine blade, which leads to a significant reduction of computational expense. LES with the Ffowcs-Williams and Hawkings acoustic analogy is used to predict the far field acoustic noise. Initial results with rotational CART-2 wind turbine blade show good agreement with the available experimental data.

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  • Self-enhancement, crash-risk optimism and the impact of safety advertisements on young drivers

    Harre, Nicole; O'Neill, M (2006)

    Conference item
    The University of Auckland Library

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  • Assessing the validity of rocking in URM perforated shear walls

    Knox, Charlotte; Ma, QT; Ingham, Jason (2010)

    Conference item
    The University of Auckland Library

    The validity of implementing a ‘rocking wall retrofit’ for New Zealand’s earthquake prone unreinforced masonry buildings was assessed. The parameters governing rocking response are detailed, and the identification of rocking-sympathetic characteristics in representative New Zealand unreinforced masonry building typologies are highlighted. A series of experimental tests were conducted in order to identify variables that had potential to alter the rocking response of piers subjected to seismic loading. The influence of boundary conditions on the failure mechanism of unreinforced masonry piers is discussed in relation to the design of the full scale testing rig. Results from testing of two full scale unreinforced masonry sub-structures consisting of two piers coupled by a deep spandrel are reported. The tests access the influence of aspect ratio and vertical precompression levels on the forcedisplacement and pier-spandrel rotational behaviour. Crack patterns evidenced in a series of plaster formed scale models is compared to those developed during full scale pseudo-static cyclic tests on unreinforced masonry shear walls of the same geometry.

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  • Post-Earthquake Decisions on RC Buildings: Lessons from Canterbury and Emerging Challenges

    Elwood, Kenneth (2015-12)

    Conference item
    The University of Auckland Library

    Description: Observations of RC building performance in recent earthquakes with a special focus on the devastating events in Christchurch, New Zealand. These events have highlighted the complexity of post-earthquake decisions for damaged buildings and the impacts on communities. The presentation will reflect on factors influencing demolition decisions and emerging challenges for the earthquake engineering community.

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  • Exploring the Impact of 'Connective Flow' on Performance and Well-being

    Kolb, Darl; Srinivasan, Ananth (2015-06-04)

    Conference item
    The University of Auckland Library

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  • Self-Esteem in Graduate Women: A Study in Jamaica and the United States

    Frey, Rosemary (2009-06-04)

    Conference item
    The University of Auckland Library

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  • Teaching (learning about) ‘professional boundaries’ and ‘boundary crossing’

    McKimm, Judy; Barrow, Mark; Gasquoine, Sue; Rowe, Deborah (2014)

    Conference item
    The University of Auckland Library

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  • Experimental Investigation of Rigid Body Rocking

    ElGawady, Mohamed; Ma, QT; Ingham, Jason; Butterworth, John (2005)

    Conference item
    The University of Auckland Library

    This paper presents the preliminary results of an experimental investigation on the behaviour of blocks under rigid body rocking. Nine blocks with different aspect ratios were tested with varying initial amplitudes and different materials at the contact interface. Three different materials, namely concrete, timber, and steel were used to construct the base on which the blocks could rock. The rocking characteristics of the blocks were compared to the predictions by Housner’s simple rocking model (SRM). Preliminary results show that the rocking response is strongly dependent upon the aspect ratio of the block, in general accordance to SRM. In addition, different materials at the contact interface play an essential role on the block’s rocking responses.

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  • Predicting the In-Plane Rocking Behaviour of Post-Tensioned Concrete Walls Subjected to Earthquake Excitations

    Ma, QT; Wight, Gavin; Butterworth, John; Ingham, Jason (2005)

    Conference item
    The University of Auckland Library

    The current capability of predicting the dynamic rocking response of post-tensioned concrete systems when subjected to earthquake excitations is examined herein. Shake table test results of a post-tensioned concrete masonry wall were compared to the simulation results from three frequently used numerical simulation procedures. This exercise highlighted significant deficiencies with the current methods and identified energy dissipating mechanisms as the primary modelling challenge for a successful simulation. The findings of this paper cast doubts on the anecdotal claims that the dynamic behaviour of controlled rocking systems can be accurately modelled.

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  • Effect of Curvature on Structural Loading of Prismatic Bodies Subjected to Water Slamming

    Weber, John; Das, Rajarshi; Battley, Mark (2014-12-20)

    Conference item
    The University of Auckland Library

    In this study, nominally rigid, singly curved prismatic specimens of varying curvature are subjected to water slamming at a range of velocities relevant to those encountered by high performance offshore racing yachts. The experimental aspect of the study is carried out using a Servo-Hydraulic Slam Testing System (SSTS) which is capable of slamming large scale specimens representative of full scale structures such as yacht hull panels. Numerical simulations of this fluidstructure interaction problem are conducted using a coupled Finite Element - Smoothed Particle Hydrodynamics approach. Numerical simulations are performed and validated using the LS-DYNA solver. Results of panel modelling demonstrate good correlation with experimental results and indicate that curved bodies experience a much higher initial loading than rigid wedges, which then abates to a quasi-constant residual load. This difference in load profile varies significantly from that found in flat panels. These factors, when considered in the design of structures incorporating curvature, have the potential to produce more optimized and failure resistant structures.

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  • Benefits and challenges of mixed methods

    Brown, Gavin (2015-06-03)

    Conference item
    The University of Auckland Library

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  • Estimation of Direct-to-Reverberation Energy Ratio Based On Isotropic and Homogeneous Propagation Model

    Hioka, Yusuke; Furuya, K; Niwa, K; Haneda, Y (2012-09)

    Conference item
    The University of Auckland Library

    We propose a method for estimating the direct-to-reverberation energy ratio (DRR). With this method, diffuse sound field is assumed for reverberation, i.e., reverberation is modelled to propagate into a microphone isotropically with a homogeneous power spectrum density (PSD).With this model, the proposed method estimates the PSD of both direct sound and reverberation by exploiting the directivity shape of a beamformer. Simulation under an ideally diffuse field proved that the proposed method can accurately estimate the DRR from - 20 to 20 dB.

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  • Thermopile power measurement for heat balance calorimetry

    Johnston, Callum; Ruddy, Bryan; Nielsen, Poul; Taberner, Andrew (2014)

    Conference item
    The University of Auckland Library

    Very high resolution power sensors are required for measuring the rate of heat production (~10 μW) of small samples of heart muscle (rat cardiac trabeculae, ~2 mm long and ~200 μm diameter). In this paper, we examine the design criteria for thermopiles to maximize their signal-to-noise ratio for heat balance calorimetry. We found that those thermopiles with a high thermoelectric figure-of-merit (ZT) are the best for power measurements. An initial prototype with a resolution of 53 nW has been built.

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  • The Performance of Ductile R/C Frames under Seismic Loading

    Fenwick, Richard; Ingham, Jason; Wuu, PJ (1996)

    Conference item
    The University of Auckland Library

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  • Teaching Critical Reading to Inservice Teachers

    Zhang, Lawrence (2007)

    Conference item
    The University of Auckland Library

    Can critical reading be implemented in EFL reading? Can language proficiency and critical reading develop simultaneously? This session describes how critical reading is interpreted and framed by reporting EFL teachers' development from resistance to acceptance of a critical pedagogy.

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  • What We Can Do to Improve EFL Writers’ Text Quality: An Empirical Cognitive Perspective

    Zhang, Lawrence (2012)

    Conference item
    The University of Auckland Library

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  • Angular region-wise speech enhancement for hands-free speakerphone

    Hioka, Yusuke; Furuya, K; Kobayashi, K; Sakauchi, S; Haneda, Y (2012)

    Conference item
    The University of Auckland Library

    A novel speech enhancement technique using a microphone array is implemented on a hands-free speakerphone prototype. The technique is able to emphasise sound arriving from the angular region where speakers are located (speaker region) while effectively suppressing noise located in the other angular region (noise region). Experiments were performed to examine the performance of the proposed technique; the resultant directivity had a drastic drop-off between the regions while keeping its sensitivity constant within the same region.

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  • Calibration of iRobot Create using UMBmark

    Dang, Y; Wang, H; Xu, PW (2016-04-22)

    Conference item
    The University of Auckland Library

    The article deals with the calibration and simulation of the odometry based on iRobot Create. The mathematical model of robot was built and analysed. In order to calibrate the odometry and modify the parameter in the programme, we carried out UMBmark test. The accumulation of errors was simulated through Kalman filter theory.

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  • International and National Connections in e-Health for Nurses

    Honey, Michelle; Westbrooke, L (2014-11-10)

    Conference item
    The University of Auckland Library

    To provide care to the New Zealand (NZ) population of just over 4.5 million there are 50,060 nurses practising in NZ. This nursing workforce, as the single largest health professional group, is recognized as having enormous potential to advance health and disability outcomes. The improvements in internet access and speeds in NZ, the advances in web environments and the use of powerful integration engines, are now providing a background where contextual views of patient-centric data via portals is possible. With the move to Personal Health Records (PHR) and patients, as well as nurses and other health professionals, having access to patient health records, it becomes more imperative than ever for nurses to engage in informatics and to utilise the many existing resources available. This poster provides an overview of the international and national organisations and groups that nurses can connect with who are directly involved in e-health. Key organisations include the International Council of Nurses (ICN), the International Medical Informatics Association (IMIA), and IMIA – Nursing Informatics (IMIA-NI). Internationally, nursing informatics under IMIA has a history spanning over 30 years. The New Zealand representative position on IMIA-NI is currently held by Lucy Westbrooke. IMIA-NI has working groups aligned to IMIA working groups. The current working groups are Education, Standards and Consumer/Client Health Informatics as well as a strong Student group. NZ nurses are represented in most of the groups, with Michelle Honey being co-chair of the IMIA-NI Education Working Group. In this poster a number of different organisations are identified, along with distinguishing where New Zealand or nursing connections already exist. Additionally, web references for these organisations are provided which form useful starting places to access nursing informatics related resources.

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  • Tangi Whenua: opening statement on behalf of Pouerua ki Waitangi claimants.

    Kawharu, Merata (2013)

    Conference item
    The University of Auckland Library

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