title: Sheared coronal arcades: An evaluation of recent studies

authors: Craig, Ian J.D.

abstract: We show that the family of magnetic force-free equilibria obtained by Low using the generating function method is really a sequence of Gold-Hoyle flux tubes. This sequence is stable under a wide range of solar conditions since each member, specified by the shear parameter μ, is anchored to the photosphere along an axial slice. We go on to demonstrate that recent magnetic relaxation simulations by Klimchuk and Sturrock are fundamentally incapable of representing the unconnected helical field lines inherent in the high-shear (μ > 1) Low solutions. Nonetheless, we believe that the numerical simulations are more likely to describe the equilibria of highly sheared arcades since they involve no change in topology with increasing shear. This view is reinforced by magnetic energy calculations which confirm that the Gold-Hoyle solutions are more energetic for μ > 1 than the numerical equilibria of Klimchuk and Sturrock.

text: Sheared coronal arcades: An evaluation of recent studies We show that the family of magnetic force-free equilibria obtained by Low using the generating function method is really a sequence of Gold-Hoyle flux tubes. This sequence is stable under a wide range of solar conditions since each member, specified by the shear parameter μ, is anchored to the photosphere along an axial slice. We go on to demonstrate that recent magnetic relaxation simulations by Klimchuk and Sturrock are fundamentally incapable of representing the unconnected helical field lines inherent in the high-shear (μ > 1) Low solutions. Nonetheless, we believe that the numerical simulations are more likely to describe the equilibria of highly sheared arcades since they involve no change in topology with increasing shear. This view is reinforced by magnetic energy calculations which confirm that the Gold-Hoyle solutions are more energetic for μ > 1 than the numerical equilibria of Klimchuk and Sturrock.

year: 1990

title: The functionalisation of wool by tris(hydroxymethyl)phosphine for metal ion recovery

authors: Addison, Simon James

subjects: THP

abstract: Tris(hydroxymethyl)phosphine (THP) was prepared by the addition of a stoichiometric amount of base to tetrakis(hydroxymethyl)phosphonium chloride (THPC).  Freshly prepared THP was successfully immobilised onto wool through a Mannich-type condensation reaction between a hydroxymethyl group and an amine on the wool surface, forming stable gt;P-CH2-Nlt; coupling links.  The immobilisation of THP to wool stabilised the THP, which resulted in the decreased oxidation of THP to tris(hydroxymethyl)phosphine oxide (THPO).  

The presence of immobilised phosphine groups was determined colorimetrically by reaction with Ni2+ ions, which produced a bright orange nickel-phosphine complex, as well as quantitatively, by measuring nickel uptake using ICP-MS.  Immobilised THP-wool showed proportional binding for varying concentrations of metal solution.  Decreasing or increasing the concentration of the metal solution resulted in a corresponding proportional response of metal binding.  Following immobilisation onto wool, oxidation of the system by 6% H2O2 resulted in a reduced binding of 24% for Cu, 25% for Co, 27% for Ni, and 93% for Cd relative to unoxidised THP immobilised onto wool.

Additional modification of the THP-wool systems via reaction with amino acids and other related compounds overall did not appear to enhance the metal binding capacity relative to the unmodified THP-wool system.  The only modified THP-wool system that showed either retention or an increase in metal binding capacity for all metals analysed was that of 2-aminopyridine, followed by oxidation with H₂O₂.

text: The functionalisation of wool by tris(hydroxymethyl)phosphine for metal ion recovery Tris(hydroxymethyl)phosphine (THP) was prepared by the addition of a stoichiometric amount of base to tetrakis(hydroxymethyl)phosphonium chloride (THPC).  Freshly prepared THP was successfully immobilised onto wool through a Mannich-type condensation reaction between a hydroxymethyl group and an amine on the wool surface, forming stable gt;P-CH2-Nlt; coupling links.  The immobilisation of THP to wool stabilised the THP, which resulted in the decreased oxidation of THP to tris(hydroxymethyl)phosphine oxide (THPO).  

The presence of immobilised phosphine groups was determined colorimetrically by reaction with Ni2+ ions, which produced a bright orange nickel-phosphine complex, as well as quantitatively, by measuring nickel uptake using ICP-MS.  Immobilised THP-wool showed proportional binding for varying concentrations of metal solution.  Decreasing or increasing the concentration of the metal solution resulted in a corresponding proportional response of metal binding.  Following immobilisation onto wool, oxidation of the system by 6% H2O2 resulted in a reduced binding of 24% for Cu, 25% for Co, 27% for Ni, and 93% for Cd relative to unoxidised THP immobilised onto wool.

Additional modification of the THP-wool systems via reaction with amino acids and other related compounds overall did not appear to enhance the metal binding capacity relative to the unmodified THP-wool system.  The only modified THP-wool system that showed either retention or an increase in metal binding capacity for all metals analysed was that of 2-aminopyridine, followed by oxidation with H₂O₂.

year: 2009

title: Claiming collective space: Kaupapa Maori in psychology

authors: Levy, Michelle Patricia

subjects: Maori

abstract: From its inception, the Psychology Department at the University of Waikato has had a focus on issues of culture, particularly those of relevance for Maori, with these early foundations laid by Emeritus Professor James Ritchie, who in 1965 took up the founding chair of the Department. These foundations have continued to be built on, utilising a variety of different strategies. Drawing on a research base which has emerged primarily from within the Maori and Psychology Research Unit at Waikato University, this paper explores strategies which have served to carve out and claim space for Maori, both within the department, and within the wider discipline of psychology.

text: Claiming collective space: Kaupapa Maori in psychology From its inception, the Psychology Department at the University of Waikato has had a focus on issues of culture, particularly those of relevance for Maori, with these early foundations laid by Emeritus Professor James Ritchie, who in 1965 took up the founding chair of the Department. These foundations have continued to be built on, utilising a variety of different strategies. Drawing on a research base which has emerged primarily from within the Maori and Psychology Research Unit at Waikato University, this paper explores strategies which have served to carve out and claim space for Maori, both within the department, and within the wider discipline of psychology.

year: 2008