title: Molecular Systematics of the New Caledonian Cryptocaryeae (Lauraceae)

authors: Carter, Sophie Nicole

subjects: Phylogenetics

abstract: New Caledonia is an archipelago located in the southwest pacific.  It has a tropical climate influenced by the surrounding sea and is recognised as a “biodiversity hotspot”.  The flora of New Caledonia is poorly understood especially in regards to Lauraceae which has not undergone taxonomic revision since Kostermans 1974 taxonomic treatment.
The aim of this study was to test the taxonomic delimitations of the Lauraceae sub-family Cryptocaryeae in New Caledonia.  This study tested whether the New Caledonian Beilschmiedia, Cryptocarya and Endiandra are monophyletic.  Were these genera the result of one or more colonization events?  This study tested if the Cryptocarya group forms two clades as suggested by Rowher et al. (2014) and van der Merwe et al. (2016).
The phylogenetic analyses were conducted using ITS and Bayesian inference, 58 new complete ITS sequences were generated. Majority of the sequences generated were New Caledonian specimens, overall the topology of the tree was well supported.
New Caledonian Beilschmiedia and Endiandra are monophyletic, whereas, the New Caledonian Cryptocarya are not monophyletic.  New Caledonian Beilschmiedia and Endiandra are most likely the result of a single colonization event for each genus and subsequent radiation.  New Caledonian Cryptocarya are most likely the result of multiple colonization events.  The relationship between the clades of Beilschmiedia and Endiandra are unresolved.  Cryptocarya forms two strongly support clades supporting the findings of Rohwer et al. (2014) and van der Merwe et al. (2016).
Between Beilschmiedia, Cryptocarya and Endiandra, there are at least six putative new species and five genetically diverse species.  These samples need to undergo taxonomic revision and potential reidentification.  The biogeographical relationship between New Caledonian Cryptocaryeae and the rest of the Cryptocaryeae sampled is unresolved and requires further data collection and study.

text: Molecular Systematics of the New Caledonian Cryptocaryeae (Lauraceae) New Caledonia is an archipelago located in the southwest pacific.  It has a tropical climate influenced by the surrounding sea and is recognised as a “biodiversity hotspot”.  The flora of New Caledonia is poorly understood especially in regards to Lauraceae which has not undergone taxonomic revision since Kostermans 1974 taxonomic treatment.
The aim of this study was to test the taxonomic delimitations of the Lauraceae sub-family Cryptocaryeae in New Caledonia.  This study tested whether the New Caledonian Beilschmiedia, Cryptocarya and Endiandra are monophyletic.  Were these genera the result of one or more colonization events?  This study tested if the Cryptocarya group forms two clades as suggested by Rowher et al. (2014) and van der Merwe et al. (2016).
The phylogenetic analyses were conducted using ITS and Bayesian inference, 58 new complete ITS sequences were generated. Majority of the sequences generated were New Caledonian specimens, overall the topology of the tree was well supported.
New Caledonian Beilschmiedia and Endiandra are monophyletic, whereas, the New Caledonian Cryptocarya are not monophyletic.  New Caledonian Beilschmiedia and Endiandra are most likely the result of a single colonization event for each genus and subsequent radiation.  New Caledonian Cryptocarya are most likely the result of multiple colonization events.  The relationship between the clades of Beilschmiedia and Endiandra are unresolved.  Cryptocarya forms two strongly support clades supporting the findings of Rohwer et al. (2014) and van der Merwe et al. (2016).
Between Beilschmiedia, Cryptocarya and Endiandra, there are at least six putative new species and five genetically diverse species.  These samples need to undergo taxonomic revision and potential reidentification.  The biogeographical relationship between New Caledonian Cryptocaryeae and the rest of the Cryptocaryeae sampled is unresolved and requires further data collection and study.

year: 2017

title: Supercapacitor assisted power converter for DC microgrid applications with self-contained DC-UPS capability

authors: Hu, Yang

subjects: DC microgrid

abstract: Nowadays, due to the advantages inherent in using renewable energy, renewable power generation is becoming established worldwide. Direct current (DC) microgrid systems, which have been proposed as alternatives for traditional alternating current (AC) networks, enable the introduction of a large amount of solar energy by using distributed photovoltaic generation units. Meanwhile, small-scale DC microgrid systems designed at the household level are also viable options used to harness renewable energy (like solar energy) and have broad development prospects.
One of the ‘hot topics’ in the field of renewable energies is how to make efficient use of this type of energy. In this thesis, a high-efficiency DC microgrid system with supercapacitor (SC)-assisted power converter is introduced as a way to harness solar energy to run a 12 V, 50 W household lighting system.
Supercapacitor-assisted low dropout regulator (SCALDO) techniques were used to build an SC-assisted converter for a DC microgrid system. Supercapacitors in the DC microgrid acted as voltage droppers to convert 24 V solar panel’s output to 11 V – 13 V. Supercapacitors were also used as energy storage devices, and performed as a power source to run the household lighting system for a period of time after a sudden mains power outage.
Real weather condition data, including local Hamilton illuminance values, were required to design this system. These data were measured at the University of Waikato. They were converted into irradiance data and were used to create similar patterns for simulation. Prototype circuit of the complete DC microgrid system, with an SC-assisted converter was also developed and shown at the end of the thesis.

text: Supercapacitor assisted power converter for DC microgrid applications with self-contained DC-UPS capability Nowadays, due to the advantages inherent in using renewable energy, renewable power generation is becoming established worldwide. Direct current (DC) microgrid systems, which have been proposed as alternatives for traditional alternating current (AC) networks, enable the introduction of a large amount of solar energy by using distributed photovoltaic generation units. Meanwhile, small-scale DC microgrid systems designed at the household level are also viable options used to harness renewable energy (like solar energy) and have broad development prospects.
One of the ‘hot topics’ in the field of renewable energies is how to make efficient use of this type of energy. In this thesis, a high-efficiency DC microgrid system with supercapacitor (SC)-assisted power converter is introduced as a way to harness solar energy to run a 12 V, 50 W household lighting system.
Supercapacitor-assisted low dropout regulator (SCALDO) techniques were used to build an SC-assisted converter for a DC microgrid system. Supercapacitors in the DC microgrid acted as voltage droppers to convert 24 V solar panel’s output to 11 V – 13 V. Supercapacitors were also used as energy storage devices, and performed as a power source to run the household lighting system for a period of time after a sudden mains power outage.
Real weather condition data, including local Hamilton illuminance values, were required to design this system. These data were measured at the University of Waikato. They were converted into irradiance data and were used to create similar patterns for simulation. Prototype circuit of the complete DC microgrid system, with an SC-assisted converter was also developed and shown at the end of the thesis.

year: 2017

title: Connections, working collaboratively and health workforce development

authors: Masters-Awatere, Bridgette

subjects: Rangahau Māori

abstract: I was invited to deliver a presentation as part of the Inaugral series of research symposia hosted by the national Maori health authority - Te Aka Whaiora

text: Connections, working collaboratively and health workforce development I was invited to deliver a presentation as part of the Inaugral series of research symposia hosted by the national Maori health authority - Te Aka Whaiora

year: 2023-08-30