title: Book review: Ecological Restoration

authors: Clarkson, Bruce D.

subjects: book review

abstract: This article reviews the book “Ecological Restoration”, by Susan M. Galatowitsch.

text: Book review: Ecological Restoration This article reviews the book “Ecological Restoration”, by Susan M. Galatowitsch.

year: 2013

title: Thermomechanical processing of cost-affordable powder metallurgy Ti-5Fe alloys from the blended elemental approach: Microstructure, tensile deformation behavior, and failure

authors: Romero Villarreal, Carlos

subjects: Science & Technology

abstract: The development of cost-affordable Ti alloys is key for the application of Ti in other industries like the automobile sector. Therefore, a combination of powder metallurgy (PM) and low-cost compositions is an interesting approach. In this article, a cost-affordable PM Ti-5Fe alloy is processed following the blended elemental route and extruded at high temperature to remove porosity. Different extrusion temperatures and heat treatments (i.e., solution treatment and aging, STA) are performed to obtain ultrafine microstructures, and their effect on the mechanical behavior is studied. For extrusions in the β phase, microstructures consist of coarse lamellar colonies, resulting in alloys with improved properties compared to the as-sintered alloy but still lacking toughness due to the failure happening just after necking onset. Extruding in the α + β phase results in a bimodal microstructure of fine elongated primary α and coarse lamellar colonies, and the alloy becomes tougher. STA with aging below the eutectoid temperature of 590 °C leads to a hard but brittle alloy, whereas STA with aging above it results in alloys with strength comparable to the as-extruded conditions and enhanced ductility.

text: Thermomechanical processing of cost-affordable powder metallurgy Ti-5Fe alloys from the blended elemental approach: Microstructure, tensile deformation behavior, and failure The development of cost-affordable Ti alloys is key for the application of Ti in other industries like the automobile sector. Therefore, a combination of powder metallurgy (PM) and low-cost compositions is an interesting approach. In this article, a cost-affordable PM Ti-5Fe alloy is processed following the blended elemental route and extruded at high temperature to remove porosity. Different extrusion temperatures and heat treatments (i.e., solution treatment and aging, STA) are performed to obtain ultrafine microstructures, and their effect on the mechanical behavior is studied. For extrusions in the β phase, microstructures consist of coarse lamellar colonies, resulting in alloys with improved properties compared to the as-sintered alloy but still lacking toughness due to the failure happening just after necking onset. Extruding in the α + β phase results in a bimodal microstructure of fine elongated primary α and coarse lamellar colonies, and the alloy becomes tougher. STA with aging below the eutectoid temperature of 590 °C leads to a hard but brittle alloy, whereas STA with aging above it results in alloys with strength comparable to the as-extruded conditions and enhanced ductility.

year: 2020

title: A literary and linguistic critique of a Māori lullaby

authors: August, Tipene

subjects: waiata Māori

abstract: Māori song poems surviving from pre-colonial times can provide a valuable source of information about the artistic and cultural heritage of Māoridom. However, they present a number of challenges for the contemporary analyst. On the basis of a stylistic analysis of a Māori lullaby, a number of hypotheses about Māori song poems in general, and the lullaby in particular, are put forward and it is suggested that these hypotheses could be tested in relation to a corpus of song poems. It is hoped that the approach to stylistic analysis adopted here will be of use to scholars of Māori song poems and, perhaps, also to others who are interested in indigenous art forms more generally.

text: A literary and linguistic critique of a Māori lullaby Māori song poems surviving from pre-colonial times can provide a valuable source of information about the artistic and cultural heritage of Māoridom. However, they present a number of challenges for the contemporary analyst. On the basis of a stylistic analysis of a Māori lullaby, a number of hypotheses about Māori song poems in general, and the lullaby in particular, are put forward and it is suggested that these hypotheses could be tested in relation to a corpus of song poems. It is hoped that the approach to stylistic analysis adopted here will be of use to scholars of Māori song poems and, perhaps, also to others who are interested in indigenous art forms more generally.

year: 2001-02