title: Effect of milling parameters on microstructure of Ti/Al composite powder produced by discus milling

authors: Raynova, Stiliana (Stella) Rousseva

subjects: TiAl

abstract: The motivation of this research is to develop a process for producing Ti/Al composite powders that enable synthesis of a single-phase TiAl intermetallic bulk material, which is then used as a target for physical vapour deposition (PVD) coating. This study reports the effects of milling time, amount of process control agent (PCA) added as well as the powder-to-medium ratio on the microstructure of the Ti/Al composite powder. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate the level of mixing and the resulting powder particle size. X-ray diffraction analysis and differential thermal analysis were used for determining the phase constituents and the solid state reaction temperature of the as-milled powders.

text: Effect of milling parameters on microstructure of Ti/Al composite powder produced by discus milling The motivation of this research is to develop a process for producing Ti/Al composite powders that enable synthesis of a single-phase TiAl intermetallic bulk material, which is then used as a target for physical vapour deposition (PVD) coating. This study reports the effects of milling time, amount of process control agent (PCA) added as well as the powder-to-medium ratio on the microstructure of the Ti/Al composite powder. Optical microscopy and scanning electron microscopy (SEM) were used to evaluate the level of mixing and the resulting powder particle size. X-ray diffraction analysis and differential thermal analysis were used for determining the phase constituents and the solid state reaction temperature of the as-milled powders.

year: 2006

title: Provisional chronology of a late Quaternary core from Lake Waikare, North Island, New Zealand

authors: Lowe, David J.

abstract: Lake Waikare is a shallow ( < 2 m), 34. 4 km² riverine lake near Hamilton, North Island, New Zealand (175° 12' S, 37° 24'E). Ac. 12.5 m long (corrected depth) sediment core taken from the lake in 1990 comprises mainly green-grey lacustrine clays with interbedded layers of peat, brownish clays, occasional fluvial sandy layers, and several thin tephra deposits. Lake sediment at the base of the core has been dated at 26 000 ± 1600 years BP (old half life basis) using the C-14 method; charcoal fragments at c. 11.7 m depth were dated at 17 300 ± 400 years BP; and a tephra layer at c. 8.5 m depth has been provisionally identified, using major element composition of glass, as the Rerewhakaaitu Tephra with an age of 14 700 ± 110 years BP. These ages accord with previous work in the area.

text: Provisional chronology of a late Quaternary core from Lake Waikare, North Island, New Zealand Lake Waikare is a shallow ( < 2 m), 34. 4 km² riverine lake near Hamilton, North Island, New Zealand (175° 12' S, 37° 24'E). Ac. 12.5 m long (corrected depth) sediment core taken from the lake in 1990 comprises mainly green-grey lacustrine clays with interbedded layers of peat, brownish clays, occasional fluvial sandy layers, and several thin tephra deposits. Lake sediment at the base of the core has been dated at 26 000 ± 1600 years BP (old half life basis) using the C-14 method; charcoal fragments at c. 11.7 m depth were dated at 17 300 ± 400 years BP; and a tephra layer at c. 8.5 m depth has been provisionally identified, using major element composition of glass, as the Rerewhakaaitu Tephra with an age of 14 700 ± 110 years BP. These ages accord with previous work in the area.

year: 1992

title: Understanding the use of Māori and English in dual language picturebooks through a sociolinguistic lens

authors: Daly, Nicola

abstract: In this presentation I will explore the use of te reo Māori in English text in dual language picturebooks published in Aotearoa/New Zealand. A series of studies examining the frequency of Māori loanwords in children’s picturebooks (Daly 2007; Daly 2008; Macdonald & Daly, 2013) are presented showing that when books came out of a publishing company with a commitment to publishing Māori and Pasifika stories, the frequency of loanwords was much higher than in other contexts; but even when a survey of all picturebooks published in New Zealand between 1995 and 2005 was conducted, the frequency of loanwords was much higher than in previous studies of comparable literature, such as the New Zealand school journal (Macalister, 1999). Very few dual language picturebooks featuring Māori and English are produced in New Zealand (Daly 2016a; Daly 2016b). The synchronous or sequential format of having separate books for each language seems to be favoured. But it is in the parallel dual language format (where both languages are present in a single book) that the relative status of the two languages is evident. In the second part of the presentation the layout and comparative presentation of the two languages are explored in terms of size of font and order of languages, using a Linguistic Landscape framework (Landry & Bourhis, 1997). These uses of two languages within New Zealand children’s literature (both interlingual and dual language) are examined and considered in terms of Bell’s (1984) theory of Audience Design, considering whether writers and publishers of such literature are now catering for a wider and more bilingual audience and whether publishing such linguistically diverse material such linguistically diverse picturebooks may be contributing to the creation of a more bilingual society.

text: Understanding the use of Māori and English in dual language picturebooks through a sociolinguistic lens In this presentation I will explore the use of te reo Māori in English text in dual language picturebooks published in Aotearoa/New Zealand. A series of studies examining the frequency of Māori loanwords in children’s picturebooks (Daly 2007; Daly 2008; Macdonald & Daly, 2013) are presented showing that when books came out of a publishing company with a commitment to publishing Māori and Pasifika stories, the frequency of loanwords was much higher than in other contexts; but even when a survey of all picturebooks published in New Zealand between 1995 and 2005 was conducted, the frequency of loanwords was much higher than in previous studies of comparable literature, such as the New Zealand school journal (Macalister, 1999). Very few dual language picturebooks featuring Māori and English are produced in New Zealand (Daly 2016a; Daly 2016b). The synchronous or sequential format of having separate books for each language seems to be favoured. But it is in the parallel dual language format (where both languages are present in a single book) that the relative status of the two languages is evident. In the second part of the presentation the layout and comparative presentation of the two languages are explored in terms of size of font and order of languages, using a Linguistic Landscape framework (Landry & Bourhis, 1997). These uses of two languages within New Zealand children’s literature (both interlingual and dual language) are examined and considered in terms of Bell’s (1984) theory of Audience Design, considering whether writers and publishers of such literature are now catering for a wider and more bilingual audience and whether publishing such linguistically diverse material such linguistically diverse picturebooks may be contributing to the creation of a more bilingual society.

year: 2018