Science and Engineering
This community houses research from the Faculty of Science and Engineering at the University of Waikato.
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Antarctic Theses [49]
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Fabrication, microstructure, mechanical, and electrochemical properties of NiMnFeCu high entropy alloy from elemental powders
(MDPI AG, 2022)Transition metal based high entropy alloys (HEAs) are often used in electrocatalytic (water electrolysis) applications due to the synergistic effect operating among its constituent elements and unpaired electrons in d ... -
Relationship between meteoric ¹⁰Be and NO₃⁻ concentrations in soils along Shackleton Glacier, Antarctica
(European Geosciences Union, 2021)Outlet glaciers that flow through the Transantarctic Mountains (TAM) experienced changes in ice thickness greater than other coastal regions of Antarctica during glacial maxima. As a result, ice-free areas that are currently ... -
Maximal Associated Regression: A nonlinear extension to Least Angle Regression
(Institute of Electrical and Electronics Engineers (IEEE), 2021)This paper proposes Maximal Associated Regression (MAR), a novel algorithm that performs forward stage-wise regression by applying nonlinear transformations to fit predictor covariates. For each predictor, MAR selects ... -
Lock-in thermography using miniature infra-red cameras and integrated actuators for defect identification in composite materials
(Elsevier BV, 2022)A novel approach for thermographic Non-Destructive Evaluation (NDE) of laminated polymer composite structures is presented. The technique is based on Lock-In Thermography (LIT), which traditionally uses an external heat ... -
Low-cost fluid flow sensor to enable electronic control of fractional distillation columns
(2021)A sensor is described that measures fluid flow up to 20 ml/minute, and down to 0.001 ml/minute. The measurement involves counting drips as they fall through a pair of optical beams. The beams are formed using a pair of ... -
Geochemical zones and environmental gradients for soils from the central Transantarctic Mountains, Antarctica
(European Geosciences Union, 2021)Previous studies have established links between biodiversity and soil geochemistry in the McMurdo Dry Valleys, Antarctica, where environmental gradients are important determinants of soil biodiversity. However, these ... -
Characterizing porous microaggregates and soil organic matter sequestered in allophanic paleosols on Holocene tephras using synchrotron-based X-ray microscopy and spectroscopy
(Nature Portfolio, 2021)Allophanic tephra-derived soils can sequester sizable quantities of soil organic matter (SOM). However, no studies have visualized the fine internal porous structure of allophanic soil microaggregates, nor studied the ... -
Speed regulation of model railway controllers: A comparison of technologies
(2021)In this manuscript the relative performance of a variety of model railway controllers is tested in real-world conditions. Model railway locomotives use permanent-magnet, brushed, dc motors. Series resistance in armature ... -
Barriers and facilitators of access to psychological services for indigenous populations: A scoping review and thematic analysis
(Frontiers Media SA, 2021)Background: The extent to which behavior-analytic interventions are offered to Indigenous populations across CANZUS in accessible and culturally appropriate ways is unknown. We conducted a scoping review with a thematic ... -
Implant conductor assembly with improved radio frequency properties
(2021)In one aspect the invention provides an implant conductor lead assembly which includes an electrode lead, and at least one field target conductor. The field target conductor(s) is located adjacent to the electrode lead to ... -
TephraNZ: a major- and trace-element reference dataset for glass-shard analyses from prominent Quaternary rhyolitic tephras in New Zealand and implications for correlation
(Copernicus Publications on behalf of the European Geosciences Union, 2021)Although analyses of tephra-derived glass shards have been undertaken in New Zealand for nearly four decades (pioneered by Paul Froggatt), our study is the first to systematically develop a formal, comprehensive, openaccess ... -
Note on random raindrops and sampling error
(IWA Publishing, 1980)A number of variables of interest in precipitation studies can be interpreted as sums of random numbers of random variables, where the summed quantity is a power transformation of raindrop diameter. Included in this category ... -
Prediction of the mechanical properties of isotropic pure metal-based and two-phase alloy-based porous materials using modified analytical models
(Elsevier BV, 2021)This work investigates the applicability and accuracy of the five fundamental analytical models commonly used to estimate the thermophysical properties of porous materials for the prediction of the mechanical behaviour, ... -
Improving the alignment of dynamic sheet-formed mats by changing nozzle geometry and their reinforcement of polypropylene matrix composites
(MDPI AG, 2021)The main objective of this study was to improve the orientation of fibres within the mats produced using dynamic sheet forming (DSF). DSF is used to make fibre mats by forcing a fibre suspension through a nozzle onto a ... -
Direct extrusion 3D printing for a softer PLA-based bio-polymer composite in pellet form
(Elsevier BV, 2021)Fused deposition modelling is the most popular method of 3D printing with a variety of polymers, but the raw materials are commonly in the filament form. Research has demonstrated the ability to use pellets for this process, ... -
AI augmented approach to identify shared ideas from large format public consultation
(MDPI AG, 2021)Public data, contributed by citizens, stakeholders and other potentially affected parties, are becoming increasingly used to collect the shared ideas of a wider community. Having collected large quantities of text data ... -
Decadal shoreline erosion and recovery of beaches in modified and natural estuaries
(Elsevier BV, 2021)Sandy beaches in estuaries and bays (BEBs) are common landforms on the coasts of many major cities. They exist under a wide range of settings and their morphology is controlled by their distance from the estuary/bay entrance, ... -
Evaluating earthquake hazard and risk using liquefied volcanic-ash layers in lakes
(Australasian Quaternary Association (AQUA), 2021)Liquefied volcanic-ash or tephra layers, for which we have coined a new term, ‘tephra seismites’, are preserved in lake sediments in numerous 20,000-year-old lakes in the Hamilton Basin in northern North Island. Up to five ... -
Cellulose nanocrystal treatment of aligned short hemp fibre mats for reinforcement in polypropylene matrix composites
(Springer Science and Business Media LLC, 2021)Oriented short hemp fibre mats were produced using dynamic sheet forming (DSF) incorporating cellulose nanocrystals (CNCs) to improve their integrity. The CNCs were found to act as a binder and improve mechanical strength ... -
Geology of the Maketu Area, Bay of Plenty, North Island, New Zealand. Sheet V14 1:50 000
(Department of Earth and Ocean Sciences, University of Waikato in collaboration with Bay of Plenty Regional Council, Whakatane, 2006)The area covered in this report on the geology of Sheet V14 Maketu 1 :50 000 includes Motiti Island and a small triangular section of the Bay of Plenty coastal lowlands from the Kaituna River mouth to Pukehina Beach within ...
