title: Comparison of wave and turbulence evolution in magnetohydrodynamics

authors: McAlley, Hamish

abstract: Magnetohydrodynamics (MHD) is the area of physics dedicated to the study of electrically conducting fluids. These fluids can support linear waves and non-linear turbulence dynamics. This thesis presents results and analysis of the evolution of the linearised MHD equations and the full non-linear MHD equations, starting from the same initial state. A systematic parameter study is conducted, varying the mean magnetic field strength, cross helicity, and Alfvén ratio. The focus is on incompressible MHD, though compressible systems also exist, and indeed are more prevalent as incompressible MHD is largely idealised.

text: Comparison of wave and turbulence evolution in magnetohydrodynamics Magnetohydrodynamics (MHD) is the area of physics dedicated to the study of electrically conducting fluids. These fluids can support linear waves and non-linear turbulence dynamics. This thesis presents results and analysis of the evolution of the linearised MHD equations and the full non-linear MHD equations, starting from the same initial state. A systematic parameter study is conducted, varying the mean magnetic field strength, cross helicity, and Alfvén ratio. The focus is on incompressible MHD, though compressible systems also exist, and indeed are more prevalent as incompressible MHD is largely idealised.

year: 2023

title: Camphene-derived primary and hydroxymethyl phosphines

authors: Berrigan, Rebecca A.

subjects: Chemistry

abstract: Thermal disproportionation of (2,2-dimethylbicyclo[2.2.1]hept-3-ylmethyl)phosphinic acid (endo-8-camphanylphosphinic acid, camPO₂H₂) yields the primary phosphine (2,2-dimethylbicyclo[2.2.1]hept-3-ylmethyl)phosphine (camPH₂). The compound has been characterised by NMR spectroscopy, and as its tris(hydroxymethyl)phosphonium chloride salt [camP(CH₂OH)₃]Cl, synthesised by reaction with excess formaldehyde and hydrochloric acid. The X-ray crystal structure of this phosphonium salt is reported, confirming the endo position of the phosphonium group. On treatment with triethylamine base, camP(CH₂OH)₃ ⁺Cl⁻ is converted to the hydroxymethylphosphine camP(CH₂OH)₂. The sulfide and selenide of this phosphine have been prepared, together with the platinum(II) complex cis-[PtCl₂{camP(CH₂OH)₂}₂]. The gas-phase decomposition of camPH₂ has been investigated using the technique of IR laser powered homogeneous pyrolysis. Results indicate the initial elimination of phosphine, followed by the rearrangement and decomposition of camphene through two distinct pathways.

text: Camphene-derived primary and hydroxymethyl phosphines Thermal disproportionation of (2,2-dimethylbicyclo[2.2.1]hept-3-ylmethyl)phosphinic acid (endo-8-camphanylphosphinic acid, camPO₂H₂) yields the primary phosphine (2,2-dimethylbicyclo[2.2.1]hept-3-ylmethyl)phosphine (camPH₂). The compound has been characterised by NMR spectroscopy, and as its tris(hydroxymethyl)phosphonium chloride salt [camP(CH₂OH)₃]Cl, synthesised by reaction with excess formaldehyde and hydrochloric acid. The X-ray crystal structure of this phosphonium salt is reported, confirming the endo position of the phosphonium group. On treatment with triethylamine base, camP(CH₂OH)₃ ⁺Cl⁻ is converted to the hydroxymethylphosphine camP(CH₂OH)₂. The sulfide and selenide of this phosphine have been prepared, together with the platinum(II) complex cis-[PtCl₂{camP(CH₂OH)₂}₂]. The gas-phase decomposition of camPH₂ has been investigated using the technique of IR laser powered homogeneous pyrolysis. Results indicate the initial elimination of phosphine, followed by the rearrangement and decomposition of camphene through two distinct pathways.

year: 2001-01-01

title: An exploration of the ethical implications of the digitisation and dissemination of Mātauranga Māori  (with special reference to the Pei te Hurinui Jones Collection)

authors: Anderson, Michela

subjects: digitisation

abstract: At the core of this thesis is the ethical implications involved in the digitising of Mātauranga Māori. It investigated how Kaupapa Māori theory can inform this process and how issues relating to access were considered.  It is intended that this information should provide whānau, hapū, iwi and institutions with a solid foundation for the development of their own digital collections. The research reported here tracks the processes and procedures undertaken by a Research Team on a Ngā Pae o te Māramatanga research funded project that is being conducted to research and develop ethical processes for the digitisation of the manuscripts, works and collected taonga of one of Māoridom’s prominent scholars, the late Dr. Pei te Hurinui Jones. 

The thesis begins with an outline of the scope of the research and the approaches and methods used (Chapter 1).  This is followed by selected literature reviews on museums, libraries and archives and the influence of writing in the Aotearoa /New Zealand context (see Chapter 2), digitisation, digital libraries and Mātauranga Māori (see Chapter 3), and ethics, ethics in practice and Kaupapa Māori theory (see Chapter 4).  Chapter 5 describes the Pei te Hurinui Jones’ collections, the processes that were undertaken during the initial negotiation stages, the development of tikanga in the archiving, cataloguing, physical layout and conservation of the collection and the drafting and development of the Deed of Gift under the principle of takoha. Chapter 6 discusses the research ethics approval process, the methodology applied, and the development and analysis of the thematic categories that emerged from the focus group discussion. A conceptual model of the digitisation process is then presented. Chapter 7 provides an overview of the research and a summary of the findings, together with an indication of its limitations, research contribution, and suggestions for future research.

text: An exploration of the ethical implications of the digitisation and dissemination of Mātauranga Māori  (with special reference to the Pei te Hurinui Jones Collection) At the core of this thesis is the ethical implications involved in the digitising of Mātauranga Māori. It investigated how Kaupapa Māori theory can inform this process and how issues relating to access were considered.  It is intended that this information should provide whānau, hapū, iwi and institutions with a solid foundation for the development of their own digital collections. The research reported here tracks the processes and procedures undertaken by a Research Team on a Ngā Pae o te Māramatanga research funded project that is being conducted to research and develop ethical processes for the digitisation of the manuscripts, works and collected taonga of one of Māoridom’s prominent scholars, the late Dr. Pei te Hurinui Jones. 

The thesis begins with an outline of the scope of the research and the approaches and methods used (Chapter 1).  This is followed by selected literature reviews on museums, libraries and archives and the influence of writing in the Aotearoa /New Zealand context (see Chapter 2), digitisation, digital libraries and Mātauranga Māori (see Chapter 3), and ethics, ethics in practice and Kaupapa Māori theory (see Chapter 4).  Chapter 5 describes the Pei te Hurinui Jones’ collections, the processes that were undertaken during the initial negotiation stages, the development of tikanga in the archiving, cataloguing, physical layout and conservation of the collection and the drafting and development of the Deed of Gift under the principle of takoha. Chapter 6 discusses the research ethics approval process, the methodology applied, and the development and analysis of the thematic categories that emerged from the focus group discussion. A conceptual model of the digitisation process is then presented. Chapter 7 provides an overview of the research and a summary of the findings, together with an indication of its limitations, research contribution, and suggestions for future research.

year: 2012