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 [21]
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Additive manufacturing of Ti-6Al-4V with added boron: Microstructure and hardness modification
(Trans Tech Publications, 2018)Titanium alloy composites with titanium boride (TiB) discontinuous reinforcement have shown improved performance in terms of strength, stiffness, and hardness. Producing this composite through selective laser melting (SLM) ... -
The effect of heat treatments on microstructure and mechanical properties of as-extruded Ti-6Al-4V alloy rod from blended elemental powders
(Trans Tech Publications, 2018)In this study, Ti-6Al-4V bars were first prepared by extrusion of powder compacts from blended powder mixtures in the beta phase region, then the as-extruded bars were heat-treated following four different conditions: beta ... -
On microstructural evolution and mechanical properties of Ti-5Al-5V-5Mo-3Cr alloy synthesised from elemental powder mixtures
(Elsevier, 2018)In this paper, we explored to prepare a multi-compositional titanium alloy, Ti-5Al-5V-5Mo-3Cr (Ti-5553), by powder compact extrusion from elemental powder mixtures, and investigate the microstructure variation during the ... -
Effect of minor titanium addition on copper/diamond composites prepared by hot forging
(Springer Verlag, 2018)Copper/diamond composites have great potential to lead the next generation of advanced heat sink materials for use in high-power electronic devices and high-density integrated circuits because of their potential excellent ... -
Producing High-Quality Titanium Alloy by a Cost-Effective Route Combining Fast Heating and Hot Processing
(Springer, 2018)Powder metallurgy is a very attractive method for producing titanium alloys, which can be near-net-shape formed and have freedom in composition selection. However, applications are still limited due to product affordability. ... -
Evaluation of reactive induction sintering as a manufacturing route for blended elemental Ti-5Al-2.5Fe alloy
(Elsevier, 2018)This work focuses on gaining a better understanding of the feasibility of using reactive induction sintering to obtain the alloy Ti-5Al-2.5Fe using Ti, Al and Fe powders (i.e. via a blended elemental approach). For this, ... -
Effect of microwave sintering parameters on the physical and mechanical properties of pure Ti and blended elemental Ti alloys
(Trans Tech Publications, 2018)Microwave sintering (MWS) was used to consolidate hydride de-hydride Ti powder and blended elemental Ti6Al4V, Ti5Fe and Ti5Al5Mo5V3Cr (Ti5553) powder mixtures. The amount of powders used to prepare the powder compacts was ... -
Joint effect of steel addition and press-and-sinter on the properties of low-cost PM Ti Alloys
(Trans Tech Publications, 2018)Cheap alloying elements and creative processing techniques are a way forward to open up more industrial opportunities for Ti in sectors where it is not extensively applied yet, rather than in aerospace and biomedical ... -
Microstructure and mechanical properties of Ti-5Al-2.5Fe alloy produced by powder forging
(Trans Tech Publications, 2018)Blended elemental powder metallurgy is a cost effective approach to produce near net shape titanium alloy parts; however, the residual pores remaining in sintered parts are detrimental to the mechanical properties. In this ... -
Inter-laboratory testing of the effect of DNA blocking reagent G2 on DNA extraction from low-biomass clay samples
(Nature Publishing Group, 2018-04-09)Here we show that a commercial blocking reagent (G2) based on modifed eukaryotic DNA signifcantly improved DNA extraction efciency. We subjected G2 to an inter-laboratory testing, where DNA was extracted from the same clay ... -
Crystal structure of an inferred ancestral bacterial pyruvate decarboxylase
(International Union of Crystallography, 2018)Pyruvate decarboxylase (PDC; EC 4.1.1.1) is a key enzyme in homofermentative metabolism where ethanol is the major product. PDCs are thiamine pyrophosphate- and Mg2+ ion-dependent enzymes that catalyse the non-oxidative ... -
A Q-Slot Monopole for UWB Body-Centric Wireless Communications
(IEEE, 2017)This paper presents a novel and simple ultrawideband printed rectangular monopole antenna for body-centric wireless communications. The design is based on etching a Q-slot on a rectangular radiator and is optimized to ... -
Capacitor-Loaded Spoof Surface Plasmon for Flexible Dispersion Control and High-Selectivity Filtering
(IEEE, 2017)This letter proposes a new spoof surface plasmon transmission line (SSP-TL) using capacitor loading technique. This new SSP-TL features flexible and reconfigurable dispersion control and highly selective filtering performance ... -
Spoof Surface Plasmon Polariton Leaky-Wave Antennas using Periodically Loaded Patches above PEC and AMC Ground Planes
(IEEE, 2017)This letter proposes two spoof surface plasmon polariton (SSPP) leaky-wave antennas using periodically loaded patches above perfect electric conductor (PEC) and artificial magnetic conductor (AMC) ground planes, respectively. ... -
Summer dry-down modulates the isotopic composition of soil CO2 production in snow-dominated landscapes
(Public Library of Science, 2018)In mountainous landscapes, soil moisture is highly dynamic due to the effects of topography and the temporal variability imposed by seasonal precipitation, including rainfall and snow. Soil moisture is known to affect ... -
Te Whariki revisited: How approaches to assessment can make valued learning visible
(New Zealand Tertiary College, 2018)In 2016, Te Whariki: He Whariki Matauranga mō ngā Mokopuna o Aotearoa: Early Childhood Curriculum (Te Whariki) (Ministry of Education [MoE], 2017), New Zealand’s early childhood curriculum was updated for the first time ... -
Sulphate partitioning into calcite: Experimental verification of pH control and application to seasonality in speleothems
(Elsevier, 2018)Carbonate-associated sulphate (CAS) is a useful carrier of palaeoenvironmental information throughout the geologic record, particularly through its stable isotope composition. However, a paucity of experimental data restricts ... -
Preparation and characterisation of decoloured Novatein and modified PLA blends
(2017)Modified Poly (lactic acid) (PLA) was blended with Decoloured Novatein® (DNTP), a thermoplastic protein material using reactive extrusion to produce a degradable material with improved properties compared to neat Decoloured ... -
Interrogative city infrastructures
(2017)The term City Infrastructures is restricted often to the physical elements of a city, while in practice it represents both hard infrastructure of built environment and utilities, as well as soft infrastructures comprising ... -
Implant Conductor assembly with improved Radio Frequency properties
(2017)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 ...
